aluminabricks, Author at RS Kiln Refractory Bricks

The cordierite matrix in cordierite-mullite kiln furniture endows the refractory with a low coefficient of thermal expansion and good thermal shock resistance. The low-aluminum mullite particles in the cordierite-mullite kiln furniture endow the material with a certain high-temperature resistance and volume stability under thermal conditions. Cordierite-mullite only contains oxides with stable valence, which will not pollute ceramic products due to oxidation-reduction problems. Therefore, cordierite-mullite refractory materials are often used to make refractory products such as shed plates, backing plates, and supports of ceramic kilns. What are the characteristics of cordierite-mullite kiln furniture?

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Cordierite Mullite Kiln Furniture

Primary kiln furniture refers to refractory products such as shed slabs and pillars for building the firing space. Secondary kiln furniture refers to the small kiln furniture placed on the primary kiln furniture directly used to support or protect the products to be fired. In addition to primary kiln furniture, cordierite-mullite materials include secondary kiln furniture of various complexities and shapes.

Application of Cordierite Mullite in Kiln Furniture

Cordierite-mullite has good high-temperature properties such as thermal expansion and thermal shock stability. Cordierite-mullite composites are widely used.

Kiln furniture is a special-shaped refractory material that supports and protects the firing process of ceramic products and magnetic materials. It has an extremely important impact on the quality of ceramic products and the energy consumption of the ceramic industry, mainly including saggars, shed plates, pad cakes, columns, and push plates. The performance of kiln furniture directly affects the quality and production cost of fired objects such as ceramics. General kiln furniture materials should have the following basic properties: high refractoriness, good thermal shock resistance, and chemical stability; high strength at room temperature and high temperature. Because one of the functions of kiln furniture is to bear the load, it must withstand the load of the product and the kiln furniture itself. High-strength kiln furniture materials can make kiln furniture light and thin, so as to increase the density of the kiln and improve the quality of products. In addition, it is also required to have good thermal conductivity and low thermal storage, regular appearance, and precise dimensions.

The cordierite material has the characteristics of a small thermal expansion coefficient and excellent thermal shock resistance and is widely used in ceramic kiln furniture by domestic and foreign manufacturers. The thermal shock resistance of kiln furniture is a key parameter that determines the life of kiln furniture. When the main material is determined, the thermal shock resistance of kiln furniture must be improved from its microstructure. So that it has high elastic modulus, fracture surface energy and thermal conductivity, low thermal expansion coefficient, and so on. Improved thermal shock resistance can be achieved by reducing thermal stress caused by thermal expansion, forming microcrack networks, and introducing energy dissipation mechanisms during inter-particle interface fracture. The thermal shock resistance of cordierite kiln furniture can be further improved by doping andalusite to introduce the energy dissipation mechanism during interface fracture.

Although cordierite has a small thermal expansion coefficient and good thermal stability, it has a low softening temperature under load and a small operating temperature range. Although products such as mullite and silicon carbide have good high-temperature performance, their cost is high. Using the mullite effect of andalusite at high temperatures, by adding SiC and a small amount of artificial mullite, the organizational structure of cordierite ceramic kiln furniture materials can be significantly changed. Improve high-temperature performance and reduce the cost of kiln furniture materials. Cordierite and cordierite-mullite kiln furniture structure is a ring-shaped silicate. Since the tetrahedrons in the structure are connected into a special helical six-membered ring, there are large gaps in the structure. When the particle is heated, it can vibrate to the gap, so the cordierite kiln has the characteristics of a small thermal expansion coefficient and excellent thermal shock resistance. However, cordierite is an unstable compound that decomposes into mullite and glassy phases. And the firing temperature range is narrow, and the high-temperature performance is poor. The mullite material has high refractoriness and good high-temperature stability. The mismatch between the thermal expansion coefficients of cordierite and mullite results in the formation of micro-cracks at the two-phase interface, which makes the material have excellent thermal shock resistance and good high-temperature performance. Therefore, cordierite-mullite composite materials are widely used in high-grade ceramic kiln furniture at home and abroad.

With the transformation of the firing technology of the ceramic industry from the traditional saggar firing to the open flame saggarless firing technology, the demand for high-quality ceramic kiln furniture materials – shed slabs is increasing. As one of the special kiln furniture for supporting porcelain pieces shed plate has always been an important auxiliary material in the ceramic industry. The material is mostly cordierite-mullite composite material with good thermal shock resistance and high-temperature performance. The cordierite-mullite slab is sintered from mullite and cordierite. The mechanism is that cordierite has a much smaller thermal expansion coefficient than mullite due to the large voids in the ring structure of cordierite. The expansion coefficients of the two are matched, so that micro-cracks are formed at the interface of the two phases, preventing the propagation of destructive cracks. Thereby, the thermal stability performance of the cordierite-mullite shed plate is greatly improved.

High alumina refractory products containing cordierite, it is made of high alumina raw material, synthetic cordierite, and binder. The thermal shock stability of the product is very good, and it can be used as ceramic kiln furniture, heat exchanger, catalyst carrier (honeycomb ceramic) for purifying waste gas, etc. For a free quote on cordierite bricks, please contact us.

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Sep 21 2022

Requirements for the Use of Refractory Materials for Ladles

The steel ladles are the necessary equipment for receiving molten steel and for continuous casting. Because many steel grades need to be refined in the ladle, including argon blowing temperature adjustment, alloy composition fine-tuning, powder spray refining and vacuum treatment, etc. The working conditions of the ladle lining are getting worse and worse, and its working environment is.

(1) The temperature of molten steel is higher than that of the die-casting ladle.
(2) The residence time of molten steel in the ladle is prolonged.
(3) The inner lining of the ladle volatilizes itself under a high-temperature vacuum and undergoes the stirring effect of molten steel.
(4) The impact of the lining when it accepts molten steel.
(5) Erosion of slag to the lining.

Therefore, the requirements for ladle refractories are:

(1) High-temperature resistance. Can withstand high-temperature molten steel for a long time without melting and softening.
(2) Thermal shock. Can withstand repeated loading and unloading of molten steel without cracking and peeling.
(3) Corrosion is resistant to slag. Can withstand the erosion effect of slag and slag basicity changes on the lining.
(4) It has sufficient high-temperature mechanical strength. Can withstand the stirring and scouring of molten steel.
(5) The lining has a certain degree of expansion. Under the action of high-temperature molten steel, the inner linings are in close contact and become a whole.

Commonly Used Refractory Materials for Ladles

The bottom layer of the ladle. Clay bricks, also known as fired bricks. Clay bricks are made of clay (including shale, coal gangue, and other powders) as the main raw material, which is processed, shaped, dried, and fired with mud. There are solid and hollow.
Ladle working layer, high alumina brick. Among the refractory materials produced with aluminum-silicon-based raw materials, the bricks with Al2O3 as the main component are high-alumina bricks, mullite bricks, and corundum bricks.
The main body of the ladle is poured. Castable refers to the mixture composed of refractory aggregate, binder, and admixture, which is mixed with water (or liquid binder) to form mud that can be constructed by the pouring method. The difference from other unshaped refractories is that refractory castables have a certain setting and hardening time after construction. Therefore, after casting and molding, it needs to be cured for a certain period of time before it can be de-molded, and then it can be put into baking after an appropriate period of natural curing.
Ladle wall. Unburned bricks are also known as chemically bonded bricks. It refers to the refractory material that can be directly used for masonry without firing. The production process is relatively simple, it is made of refractory materials of different materials, and the combination of powder and granules in the product is mainly formed by the chemical action of the binder.

If the ladle is also used for refining, refractory materials that can also be used include zircon bricks, magnesia carbon bricks, magnesia carbon bricks, magnesia chrome bricks, magnesia chrome aluminum bricks, and the like.

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Improvement of High Alumina Bricks Used in Refining Ladle

Modern refining ladles use natural andalusite and bauxite to produce high-alumina bricks. Compared with bauxite, the former has higher purity and thermomechanical stability (such as thermal strength). Because it contains more SiO2, it has poor corrosion resistance. Especially under the condition of alkaline slag, the lining of high-alumina brick masonry refining ladle produced with bauxite clinker as the main raw material has the following shortcomings and is being eliminated.

①Due to the volume shrinkage, the molten steel and slag are seriously penetrated and eroded, especially a thick slag layer formed at the brick joints.
②Due to the inherent brittleness of the brick itself and its structure, the ladle lining forms a thicker erosion zone and a slag layer.
③ Due to the inherent wettability of the lining to molten steel and slag, the erosion and penetration of the slag are more serious, and flake spalling occurs.

In order to overcome the above shortcomings of high-alumina bricks lined with a refined ladle, Al2O3-MgO-C bricks were developed to replace them. Compared with high alumina bricks, Al2O3-MgO-C bricks have the following advantages:

(1) Good high-temperature resistance and tissue peeling resistance;
(2) Good corrosion resistance to molten steel and slag;
(3) Good residual expansion, even at higher temperatures, no cracks appear at the joints of the bricks.

Because, when the temperature is higher than 1650°C, the high-alumina bricks show obvious shrinkage, which will lead to the penetration of molten steel and slag into the brick joints. Different from high alumina bricks, Al2O3-MgO-C bricks will not shrink in the continuous casting temperature range (1650~1670℃).

Ladle Refractory Materials Manufacturers

Rongsheng refractory material manufacturer is a manufacturer of technical refractory lining material solutions with rich production and sales experience. Our excellent technical team specializes in solving the problem of refractory lining of high-temperature furnaces, including various ladle refractory problems. At the same time, our refractory brick production line and monolithic refractory production line are also the strong support of our team. From our customer base in more than 80 countries around the world, it is not difficult to see the strength of our team. Become a customer of Rongsheng Refractory Factory for free, our customer service will not let you down.

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Aug 13 2022

Castable Refractory for Circulating Fluidized Bed Boiler

There are many types of refractory castables, and the uses of each refractory castable are also different. Such as corundum wear-resistant refractory castables, low-cement refractory castables, lightweight heat-insulating refractory castables, and steel fiber refractory castables. Castables refractory for circulating fluidized bed boilers are mainly high-strength wear-resistant castables. Among them, corundum refractory castable has the characteristics of high strength and good fluidity, which is convenient for construction. It is mainly used for the parts that are easy to be washed and wear, such as the combustion chamber, separator, and flue of a circulating fluidized bed boiler.

Corundum Castable Refracotry for the C F B Boiler — Corundum Castable Refractory for the CFB Boiler

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High-Strength Corundum Wear Plastic Refractory

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Selection of Castable Refractory for Circulating Fluidized Bed Boilers and Precautions for Use

Selection of refractory castables and refractory plastics for circulating fluidized bed boilers. Taking the 75t/h circulating fluidized bed boiler as an example, the main refractory materials used are corundum wear-resistant plastics, diatomite thermal insulation castables, high-strength wear-resistant castables, phosphate refractory castables, lightweight thermal insulation bricks, diatomite thermal insulation bricks, refractory bricks, etc.

Among them, the wear-resistant layer at the lower part of the furnace and the outlet of the furnace are mainly made of corundum wear-resistant plastic. The inlet flue and target area of the separator use high-strength wear-resistant castables. The separator cylinder and cone are made of lightweight thermal insulation bricks, and the surface is made of high-strength wear-resistant castables. Phosphate refractory castables are used for air distribution devices, ignition air ducts, and furnace doors. Diatomite insulation bricks and refractory bricks are mainly used for the heating surfaces of the tail.

lightweight insulation castable — Insulation Castable

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Corundum silicon carbide wear-resistant refractory plastic — Wear Refractory Plastic

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Precautions when using refractory castables and refractory plastics for circulating fluidized bed boilers.

Clean water must be used, and the amount of water added is 6% ~ 8%.
Use a forced mixer, and all mixing tools must be cleaned. Mix until homogeneous. When stirring, the amount of material added should not be less than the whole package. Dry mix for 15min before adding water to achieve the purpose of mixing evenly.
The castable is reinforced with a large number of anchoring nails and the metal surface of the boiler. The anchoring nail is a metal material, and the thermal expansion coefficient is much larger than that of the refractory material, so the anchoring nail needs to be preheated before installation.
The pouring surface of all molds should be coated with a layer of oil.
Each batch of materials must be poured within 10 to 30 minutes after mixing. It needs to be poured to the specified thickness at one time and then vibrated until it is completely sealed.
The mold is demolded 24 hours after pouring, and the total curing time is 3 days.

How to remedy the falling off and cracking of castable refractory for circulating fluidized bed boilers?

During the operation of the circulating fluidized bed boiler, some castable refractory for boiler will fall off and crack. This part of the pipe is more prone to wear than other places because most of it occurs in the dense phase area such as the refeeder and below the water cooling screen. When this happens, the usual approach is to repair with refractory castables or plastic refractories. When repairing, the repairing materials should be mixed and stirred first, and then suitable templates and molds should be made at the repaired part. Finally, pour and repair. The repaired material should be basically cured and formed, and then gradually baked according to the heating curve. This repair method is time-consuming, labor-intensive, and quite uneconomical. If it is repaired with blue mud, it can be ignited immediately after construction, which saves time and effort, and is convenient and quick.

Monolithic Refractory Construction for CFB Boiler

Use special tools to repair the dropped boiler refractory castable to right-angle subsidence of not less than 20 mm, that is, the repair thickness is not less than 20 mm. Clean the repaired area with a brush, slice the blue mud, and stick the new side on the repaired area. Then ram it with a rubber hammer to make it firmly combine with the original refractory castable to form a flat surface.

If the refractory castable falls off and exposes the pin, it can be repaired by cutting it into pieces with blue mud and tamping and compacting. If the drop area is not large, it can be completed in ten minutes before and after. The practice has proved that repairing refractory castables with blue mud is much better than repairing refractory castables with other methods.

What boiler linings are refractory castables generally used for?

The main application scenarios of castable refractory for boilers, power generation boilers, heating boilers, waste incinerators, and other industrial kilns. Specific applications of refractory castables for boilers are as follows.

Water-cooled wall, cyclone separator, furnace, economizer, water-cooled air chamber, slag removal machine, cold ash bucket, etc. in the power generation industry.
In the lining of boiler equipment such as civil boilers, biomass boilers, steam boilers, chain furnaces, pulverized coal furnaces, etc.
Heating furnaces, soaking furnaces, forging furnaces, ladle furnaces, trolley furnaces, etc. in the foundry industry.

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Manufacturers of Refractory Castables for Boilers

Rongsheng refractory material manufacturer, environmentally friendly and advanced automatic unshaped refractory castable production line, with an annual output of tons. Can provide refractory castable lining materials for various industrial boilers. In addition, we can also provide high-quality refractory and wear-resistant plastics, refractory ramming materials, etc. It is matched with the high-quality refractory castable binder produced by Rongsheng, aluminum dihydrogen phosphate. Unshaped refractory lining materials can be formulated with the advantages of strong wear resistance, corrosion resistance, air erosion resistance, high strength, and stable performance. Improve the service life of boiler refractory castable lining. Rongsheng can also design various economical and practical unshaped refractory linings for boiler linings according to the needs of customers and the actual working conditions of boilers. Contact us for free samples and quotes.

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Industrial Refractory

Jun 30 2022

Corundum Mullite Bricks Used in the Burner of the Sleeve Lime Kiln

Generally, the burner of the sleeve lime kiln is made of magnesia refractory bricks. However, due to the fact that it is prone to breakage within a year of use, the service life of the burner brick is not synchronized with the service life of the kiln body. The burner brick of the sleeve lime kiln broke 1/3 in less than one year, and the service life of the lime kiln was more than 3 years. Therefore, the service life of the burner brick is not synchronized with the service life of the kiln body. Although the fracture of burner bricks does not affect the use of lime kilns, it has certain negative effects on the calcination process. Therefore, it is necessary to study the corundum mullite bricks used in the burner of the sleeve lime kiln.

The reason why the burner brick is easy to break is that the burner brick is made of magnesia refractory brick. In addition to excellent high-temperature resistance and lime resistance, the alkaline material also has the following unfavorable factors, which may lead to premature fracture.

Magnesium refractory has large thermal expansion and poor thermal shock resistance. The burner brick is scoured by the hot air flow of the flame, the thermal shock environment is harsh, and cracks caused by thermal shock are prone to occur.
Due to the large thermal expansion coefficient, the thermal stress of the magnesia refractory is high. When there is a local stress concentration, the fracture is easy to occur.
Magnesium refractories are easy to hydrate, resulting in bulging and cracking. Construction is greatly affected by environmental conditions. Improper baking is also prone to cracking, resulting in falling blocks. In cold and humid weather, the water in the fire mud is not easy to remove, and it is easier to hydrate the bricks. Therefore, it has strict requirements on construction environmental conditions and baking.
The thermal strength of magnesia refractories is low, and it is prone to creep under thermal stress.

Corundum Mullite Bricks Used in the Burner of the Sleeve Lime Kiln

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The improvement of burner brick material selection of burner brick prefabricated parts made of corundum mullite refractory castable has the following advantages.

The main crystal phase of corundum mullite refractory castable is corundum and mullite. Corundum has a high melting point of 2050°C, its hardness and strength can resist high temperature and airflow erosion, and it has excellent high temperature wear resistance. The melting point of mullite is also higher than 1840 ° C, which is characterized by a small thermal expansion coefficient and a needle-column mosaic structure, which has good thermal shock resistance. The refractory castable composite of corundum phase and mullite phase has the advantages of both, which can effectively resist the erosion of the burner brick by the hot air flow of the flame. At the same time, it can withstand the harsh thermal shock environment and prevent the burner brick from breaking.
Corundum mullite refractory castables do not have hydration problems. The construction is less affected by the environment, and the requirements for construction conditions are not harsh. And pouring, curing, and heat treatment can be carried out by the supplier, and the quality can be easily guaranteed. No hydration cracking during construction and baking.
The burner brick is a special-shaped brick, which is not easy to be machine-pressed. Using the casting method, it is easy to form integral or separate parts and to achieve precise control of shape and size. The critical particle size of machine-pressed bricks is limited, generally 5 mm. The critical particle size of the castable can be as large as about 20 mm, which is conducive to the stability of the structure and the improvement of thermal shock resistance.
When the burner brick is in use, since the gas (or fuel oil) is sprayed into the furnace, the CaO dust in the furnace is not easy to adhere to the burner cavity, and the reaction between CaO and the Al2O3-SiO2 material will not occur. Even if there is a small amount of CaO attached to the burner brick, the content of A12O3 in the burner brick is relatively high (greater than 75%), while the content of SiO2 and CaO is relatively low. According to the A12O3-SiO2-CaO ternary phase diagram, the reaction temperature is around 1500℃. It can be considered that the solid-phase reaction of Al2O3-SiO2-CaO does not easily occur at the working temperature of the lime kiln.

Summary: Through the analysis of the reasons for the phenomenon that the burner of the sleeve kiln is easy to break, and according to the combustion process of the lime kiln calcination zone, the structural design of the lining refractory material, etc. Production of corundum mullite refractory castable prefabs suitable for sleeve kiln burners. The corundum mullite bricks used in the burner of the sleeve lime kiln can synchronize the service life of the burner brick with the service life of the kiln body.

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Steel industry refractories

Jun 9 2022

Refractories for Sponge Iron Production by Direct Reduction Method for Sale

The main products produced by the direct reduction method are solid sponge iron, iron granules, and liquid pig iron. Among them, the production method of sponge iron is the most mature and has the largest output. The production of sponge iron mainly uses iron concentrates, iron oxide scales, and other raw materials with high iron oxide content, which are reduced to metallic iron under the action of reducing media. The reaction is a solid-phase reaction and emits a lot of gas. There are many pores in the generated solid iron, like a sponge, so it is called sponge iron. The reaction temperature is generally between 800 and 1300°C. The reducing media used are mainly non-coke reducing agents such as coal, natural gas, and coal gas. The equipment used in the production of sponge iron by the direct reduction method mainly includes a shaft kiln, square kiln, annular kiln, rotary kiln, tunnel kiln, and continuous furnace at the bottom of the trolley, etc.

Production of Sponge Iron by Shaft Kiln

It uses natural gas and steam to produce reducing gas, and then reducing gas reduces iron ore into sponge iron in a shaft furnace. The production process of HYL III sponge iron can be divided into two parts, the gas-making boundary area, and the reduction boundary area. The gas production boundary includes the generation and purification of reducing gas. The reduction boundary includes heating of reducing gas and reduction of iron ore. In the gas production boundary zone, steam and natural gas are mixed and then catalytically cracked in the reformer to produce synthesis gas mainly composed of hydrogen and carbon monoxide, which is dehydrated and sent to the reduction boundary zone. The cracking reaction is:

CH4 + H2O = CO + 3H2

CO + H2O = CO 2 + H2

In the reduction boundary area, after dehydration and decarbonation of the shaft furnace top gas, it is mixed with the gas from the gas production boundary area to form a reduction gas and enters the reduction gas heating furnace together. The heated reducing gas enters the furnace from the bottom of the reduction section of the shaft furnace and flows from bottom to top. Iron ore is added from the top of the shaft furnace and moves from top to bottom. The reducing gas and iron ore undergo a chemical reaction in reverse motion to produce sponge iron. Among them, the chemical reactions that take place are:

3CO + Fe2O 3 = 2Fe + 3CO 2

3H2 + Fe2O 3 = 2Fe + 3H2O

Process for Producing Sponge Iron in Tunnel Kiln

A tunnel kiln is a modern continuous firing thermal equipment, which is widely used in the roasting production of medium sponge iron in the metallurgical industry. It can also be used in other industries such as refractory production. The reason why the tunnel kiln has a wide range of industrial applications is inseparable from its stable firing system.

The tunnel kiln for firing sponge iron is a low-temperature kiln with a temperature range of 1000~1350℃. The heat source is clean energy natural gas, and the sponge iron reduction tank is transported by a kiln car for production reduction through a tunnel kiln. Tunnel kiln firing sponge iron is mainly divided into preheating zone, firing zone, and cooling zone. The temperature of these three parts can often be kept within a certain range. Therefore, the quality of the fired product is better.

Rotary Kiln for Producing Sponge Iron

The rotary kiln method, also known as the “SL/RN” method, uses solid fuel as a reducing agent and a rotary kiln as a reactor. The reducing agent and pellets (pig iron or pellets after oxidative roasting consolidation) simultaneously enter the rotary kiln for reduction roasting. The resulting sponge iron generally has a metallization degree of more than 90% and a particle size of 5 to 15 mm, which is usually used as a steelmaking raw material.

The working principle of the rotary kiln is to produce sponge iron. The raw material composed of solid carbon and ore particles (pellets) moves in the rotary kiln with the inclined furnace body and advances continuously. During the movement, the charge is preheated (<800°C region) and reduced (900-1000°C region) by the gas generated by the countercurrent or cocurrent combustion, and finally the product solid sponge iron is obtained.

Requirements for the Refractory Materials for Sponge Iron Production by direct reduction

At present, the sponge iron produced by shaft kilns with natural gas as the reducing medium in the world mainly accounts for about 80%. No matter what kind of kiln, the operating temperature is not high. Therefore, generally, aluminum-silicon-based refractories can meet the temperature requirements as kiln linings. However, it should be noted that Fe2O3 in the refractory material will be reduced to metallic iron and Fe3C under CO atmosphere conditions. The presence of Fe3C will promote the deposition of carbon, resulting in embrittlement cracking of the refractory. Therefore, in order to improve the service life of the furnace lining of the equipment, the Fe2O3 content in the refractory material should be reduced, and the structure of the selected material should be dense and the pores should be fine.

RS Refractory Material Manufacturer — RS Refractory Materials Manufacturer

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Rongsheng Refractory Manufacturer

Rongsheng is a refractory manufacturer with rich production and sales experience. Rongsheng’s refractory products have been sold to more than 70 countries around the world, such as South Africa, Philippines, Chile, Malaysia, Indonesia, Vietnam, Kuwait, Turkey, Zambia, Peru, Mexico, Qatar, Egypt, Russia, Kazakhstan, etc. . In solving the problem of refractory lining materials for industrial furnaces, we have also accumulated many cases and solutions for thermal furnaces of customers. If your thermal kiln needs refractory lining materials, please contact us to purchase refractory materials for the production of sponge iron kilns. It is best to attach the working conditions of your refractory kiln, the working environment of the refractory lining, the working temperature, erosion conditions, etc. Based on the information you provide, we will recommend the most suitable refractory for your production needs. In order to reduce the number of furnace shutdowns and repairs, improve production efficiency and increase production efficiency.

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Industrial Refractory

Apr 19 2022

Refractory for Smelting Ferrosilicon Furnace

Ferrosilicon furnace, also known as electric arc furnace or resistance electric furnace, is a kind of submerged arc furnace, which is an industrial electric furnace with huge power consumption. The ferrosilicon furnace is a type of high energy consumption furnace, which reduces energy consumption and increases output so that the life of the furnace can be used for a long time. Only in this way can the production cost of the enterprise be reduced and the discharge of waste residue pollutants be reduced. Therefore, its requirements for refractory materials in use are also quite strict, as is the refractory factory.

The Working Characteristics of Ferrosilicon Furnace

Ferrosilicon furnace is mainly composed of a furnace shell, furnace cover, furnace lining, short net, water cooling system, smoke exhaust system, dust removal system, electrode shell, electrode pressing and lifting system, loading and unloading system, controller, burn-through hydraulic system, transformer, and various electrical equipment. Ferrosilicon furnace is mainly used for reducing and smelting ore, carbonaceous reducing agent and solvent, and other raw materials. Production of ferrosilicon, ferromanganese, ferrochromium, ferrotungsten, silicon-manganese alloy, calcium carbide, and other ferroalloys and chemical raw materials. Its working characteristic is to use carbonaceous or magnesia refractory material as furnace lining and use self-cultivation graphite electrodes. An industrial electric furnace with continuous feeding and intermittent tapping of iron slag.

Refractory for Smelting Ferrosilicon Furnace

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Refractory Lining Materials for Smelting Ferrosilicon Furnace

Different reaction temperatures of ferrosilicon furnaces, the use of refractory materials of different refractory lining materials in kilns. This scheme is for reference only. The specific kiln lining material to be used needs to be judged only after the technician understands the use of the ferrosilicon furnace.

New material preheating zone. The uppermost layer is about 500mm, and the temperature is 500℃-1000℃. The difference in heat comes from high-temperature airflow, electrode conduction heat and surface charge combustion, and charge distribution current resistance heat. The temperature of this part is different, and the kiln lining material is made of clay bricks.

preheat zone. After the water evaporates, the charge will gradually go down and make initial changes in the preheating zone. Silica transforms, expands in volume, and then cracks or bursts. The temperature in this section is around 1300°C. Built with high alumina bricks.

Sintering zone. It is the crucible shell, the temperature is 1500℃-1700℃. Liquid silicon and iron are formed and dropped into the molten pool. The sintering and air permeability of the charge is poor, the block should be broken, the gas ventilation should be restored, and the resistance should be increased. This area is hot and aggressive. It is built with semi-graphite-silicon carbide bricks.

reduction reaction zone. A large number of intense chemical reaction zones for materials, and the temperature of the crucible zone is 1750℃-2000℃. The lower part is connected to the arc cavity, mainly for the decomposition of SIC, the generation of ferrosilicon, and the reaction of liquid Si2O with C and Si. The high-temperature area must be built with semi-graphite-fired carbon bricks.

Arc zone. In the cavity area at the bottom of the electrode, the temperature is above 2000°C. The temperature of this zone is the highest temperature zone in the whole furnace, and it is also the source of the most temperature distribution in the whole furnace body. Therefore, when the electrode is inserted shallowly, the high-temperature area moves up, the temperature of the furnace bottom is low, and the slag is less removed, forming a false furnace bottom. As a result, the tap hole is moved up, and a certain false bottom has certain benefits for protecting the furnace. Generally speaking, the depth of electrode insertion has a lot to do with the diameter of the electrode. The general insertion depth should be kept at an extreme distance of 400mm-500mm from the bottom of the furnace. This part has a higher temperature and is built with semi-graphite-fired carbon bricks.

Phosphate concrete or clay bricks are used for permanent layers. The furnace door can be cast with corundum castables or pre-laid with silicon carbide bricks.

RS refractory bricks factory — RS Refractory Bricks Factory

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In short, according to the furnace size, temperature, and erosion degree of the ferrosilicon furnace, choose suitable, environmentally friendly, refractory bricks and castables of different materials for the kiln lining. To buy refractory kiln lining material in kilns, please choose a strong refractory material manufacturer. As a refractory factory, Rongsheng refractory manufacturer has an advanced refractory production line and a professional technical team. Rongsheng Refractory Factory provides high-quality refractory kiln lining materials for industrial furnace refractory kiln linings to meet production requirements and save production costs.

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Jun 21 2021

Two Different Types of Low Cement Castables

In the refractory castable combined with calcium aluminate cement, the castable with CaO content less than 2.5%, that is, the castable with calcium aluminate cement added about 1/2 to 1/3 of the ordinary calcium aluminate cement castable, It is called low cement castable. Low cement castable materials are clay, high alumina, mullite, corundum, chromium corundum, zircon mullite, zirconium corundum, alumina-spinel, and carbon and silicon carbide, and many more. According to its operating performance, it is divided into vibrating castable and self-flowing castable. Rongsheng refractory manufacturer will introduce the above two different types of low-cement refractory castables for you.

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Two Different Types of Low Cement Castable Composition

The ingredients of vibrating low cement castables are generally: refractory aggregate 60% ~ 70%, refractory powder 18% ~ 22%. Calcium aluminate cement 3% to 7% (low cement type) or 1% to 2% (ultra-low cement type). Silica (soot silica) micro powder (or reactive alumina micro powder) 3% ~6%. Trace dispersant. The particle size composition can be according to Andreassen’s particle size distribution equation, and the q value is 0.26 ~ 0.35.

The batching composition of the self-flowing low-cement castable is similar to that of the vibrating low-cement castable, but the particle size composition and fine powder content are different. Generally, the maximum critical particle size of aggregate is not more than 6 mm, and the particle size distribution is in accordance with the Andreassen or Dinger-Funk particle size distribution equation. The value of the particle size distribution coefficient q should be controlled between 0.21 and 0.26, and a larger self-flow value (greater than 180) can be obtained between this value. When the q value is greater than 0.26, the flow value becomes smaller, and it is difficult to cause self-flow. When the q value is less than 0.21, the powder content is too large, which will affect the physical properties of the castable. The content of micro powder (silica micro powder) in the particle size composition is generally 5% ~ 6%. At the same time, high-efficiency dispersants must be used.

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Low Cement Castables Physical and Chemical Indicators

Table 1 shows the typical vibrating low-cement clay, high-aluminum, and corundum casting performance.

Table 1 Vibrating Low-Cement Castables physical and chemical indicators
Items		Clay Low Cement Castable	High-Alumina Low Cement Castable	Corundum Low Cement Castable
w(Al2O3) / %		45	75	92
w(SiO2) / %		50	12	5
w(CaO) / %		＜1.8	＜1.5	＜1.5
Bulk Density / g/cm3	110℃, 24h	2.30	2.60	3.00
Bulk Density / g/cm3	1350℃, 3h	2.26	2.61	3.10
Compressive Strength / MPa	110℃, 24h	72	75	85
Compressive Strength / MPa	1350℃, 3h	90	115	125
Linear change rate after burning / %	1000℃, 3h	-0.3	-0.2	-0.2
Linear change rate after burning / %	1350℃, 3h	±0.3	±0.5	±0.5
Max Use Temperature / ℃		1450	1600	1700
Mixing Water Demand / %		6.0 ~ 6.5	6.0 ~ 6.5	4 ~ 5

Table 2 shows the general self-flowing low-cement alumina-spinel casting performance.

Table 2 Self-Flowing Low-Cement Alumina-Spinel Castable
Items		A	B	C
w(Al2O3) / %		90	88	85
w(MgO) / %		6	6	6
w(CaO) / %		3	5	8
Bulk Density after Burning / g/cm3	110℃, 24h	3.20	3.10	3.05
	1000℃, 3h	3.10	3.08	2.92
	1600℃, 3h	3.15	2.95	2.86
Flexural Strength after Burning / MPa	110℃, 24h	6.5	9.5	10.0
	1000℃, 3h	5.5	7.6	7.8
	1600℃, 3h	30.0	21.5	20.5
Linear Change Rate after Burning / %	110℃, 24h	–	–	–
	1000℃, 3h	0.1	0	0
	1600℃, 3h	-0.1	+0.8	+0.9
Amount of Water / %		4.8 ~ 5.4	5.4 ~ 5.8	5.5 ~ 6.5
Self-Flow Value / mm		＞ 185	＞ 185	＞ 185

Low Cement Castable Refractory Material Application

Low cement castable refractory materials have a wide range of applications. In metallurgy, petrochemical, machinery manufacturing, electric power, building materials, and other industrial kilns, such castables have been widely used to replace some traditional fired refractory brick products as linings. Vibration-type low cement castable refractory materials are mainly used as thick-sized linings. Such as heating furnace, various heat treatment furnace electric furnace cover shaft kiln, rotary kiln, blast furnace tapping channel, ladle, hot metal ladle, etc. The self-flowing low cement refractory castables are mainly used as thin linings and linings for high-temperature refractory components with metal anchors. Such as the outer lining of the water-cooled pipe of the heating furnace, the lining of the integral spray gun for jet metallurgy, the lining of the immersion pipe of the RH and DH vacuum degassing device, and the air supply element of the ladle (breathable brick). And the high-temperature wear-resistant lining of the petrochemical catalytic cracking reactor.

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Refractory Castables Manufacturers

As one of the refractory castables, the unique advantages of low cement castables play an important role in refractory lining materials. Rongsheng refractory castable manufacturers have rich experience in production and sales. Its advanced environment-friendly and fully automatic unshaped refractory castable production line have an annual output of 80,000 tons. To provide our customers in more than 60 countries with high-quality refractory lining materials. For example, Russia, South Africa, Kazakhstan, Philippines, Chile, Malaysia, Uzbekistan, Indonesia, Vietnam, Kuwait, Turkey, Zambia, Peru, Mexico, Qatar, etc. Rongsheng used to customize low cement castables for customers, ultra-low cement castable, and high customer return rate. To obtain free refractory lining material configuration solutions for high-temperature kilns and solve difficult refractory lining material problems, please contact us. We will customize the refractory lining scheme for you according to your actual production situation.

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Jun 11 2021

Which is the Wear Resistance of Refractory Material?

Wear-resistant refractory materials are usually used under high-temperature conditions. Under high-temperature conditions, the erosion and abrasion of the materials produced by the kiln is an important factor that causes damage to the refractory materials in the lining of industrial kilns. Therefore, it is necessary to understand and master the erosion and wear resistance of the refractory materials selected. First, let us start to understand the wear resistance of refractory materials.

Wear Resistance of Refractory Materials

Many changes in the high-temperature wear resistance of refractory materials vary with temperature and material. It is also believed that the “higher strength, the more wear-resistant” of refractory material, this relationship will exist in similar materials, but this relationship does not necessarily exist between different types of refractory materials. For example, the wear resistance of corundum bricks with a compressive strength of 100MPa is weaker than that of high alumina bricks with a compressive strength of 86MPa. There is also the relationship between the wear resistance of refractory castables and their compressive strength and flexural strength. Some people believe that the higher the strength of high-aluminum castables, the smaller the wear. In practice, it is not found that such a relationship. In short, these are to give users a more comprehensive and in-depth understanding of the wear resistance of refractory materials.

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Wear Resistance of Different Types of Refractories

Rongsheng refractory manufacturers have mastered some rules for their wear resistance in the production of refractory materials and studied the possible influencing factors through the wear resistance of refractory materials of different materials.

The wear resistance of different refractory materials is quite different. According to the abrasion resistance of various refractory materials, it can be roughly divided into three gradients. Silicon carbide refractories have the strongest wear resistance, high-alumina refractories and corundum refractories have intermediate wear resistance, and alkaline refractories, siliceous, and clay refractories have poor wear resistance.

Due to the large difference in alumina content of high-alumina refractories, the wear distribution range is wide. The higher the hardness of the mineral, the stronger its wear resistance. It can also be said that silicon carbide refractories have the least amount of wear. Therefore, wear-resistant and refractory materials are selected for some key corrosion parts. The bonding phase of silicon nitride combined with silicon carbide material has high hardness and high strength, and the bonding phase of refractory clay combined with silicon carbide material has a lower hardness of mullite and glass phase. Therefore, silicon nitride bonded silicon carbide materials have better wear resistance than clay bonded silicon carbide materials.

The wear resistance of high-alumina castables prepared with the same high-alumina bauxite material is better than that of high-alumina bricks, and the difference in wear between the two is about 60%-90%. Similarly, the wear resistance of clay castables will be better than that of clay bricks. The castable adopts micro powder technology and the density of low-cement castables is usually greater than that of the corresponding refractory bricks. Because the castable uses a larger particle size aggregate, and the proportion of the aggregate of the castable is larger, and the aggregate is usually denser and more wear-resistant than the matrix. In order to improve the wear resistance of the castable, the wear resistance of the castable is generally improved by adding silicon carbide.

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Analysis of the Reasons for the Different Wear Resistance of Different Types of Refractories

Factors such as the type of crystal structure of different mineral phases and the size of the lattice energy cause the hardness of their minerals to be different. Atomic crystals of diamond, silicon carbide, and corundum have high Mohs hardness, while ionic crystals of spinel, mullite, periclase, and other hardnesses decrease in order. Graphite has the lowest Mohs hardness due to its layered structure composed of weak intermolecular forces. The higher the hardness of the mineral, the stronger its wear resistance. Therefore, silicon carbide material has a small amount of wear and is the most wear-resistant. Magnesia bricks, magnesia spinel bricks, and magnesia-chrome bricks with periclase as the main phase have a large amount of wear, most of which exceed 10cm³. The wear of graphite-containing aluminum-silicon carbide carbon bricks is relatively large, while that of aluminum-carbon materials with low graphite content or without graphite is relatively small.

The bonding phase of silicon nitride combined with silicon carbide materials has high hardness (Mohs hardness 9~9.5) and high strength. The mullite and glass phases of clay-bonded silicon carbide materials have a lower hardness. Therefore, silicon nitride bonded silicon carbide materials have better wear resistance than clay bonded silicon carbide materials. For the high alumina brick with 76% AL2O3 content and the third-grade high alumina brick with 58% AL2O3 content, the former has high corundum phase content, while the latter has high mullite phase content and low corundum phase content, so the former is more wear-resistant.

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Buy High-Quality Refractory Castables

To learn more about refractory materials, please continue to follow our blog. If you need to buy high-quality refractory castables, such as wear-resistant refractories, silicon carbide castables, corundum castables, please contact a strong and experienced refractory manufacturer. Rongsheng refractory material manufacturer has rich experience in the production and sales of refractory materials. Rongsheng has customers in more than 70 countries around the world, and customers continue to return orders. Moreover, Rongsheng Environmental Protection’s advanced and fully automatic monolithic refractory castables are produced first, with an annual output of 80,000 tons. The quality of Rongsheng’s refractory castables is guaranteed, and it has customer service that satisfies customers. Look forward to working with you.

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Apr 20 2021

Replacement of Checker Bricks in the Regenerator of Coke Oven

For coke ovens that have been produced for many years, the single and main walls of the regenerator will crack, melt, deform or even collapse under the action of temperature and other factors. The checker bricks are easy to be blocked, and even deform and melt at high temperatures. When these defects seriously damage the heating system, the regenerator should be renovated.

Refurbishment of the regenerator will cause the increase and expansion of cracks in the single and main walls due to cold air entering the room, so this is generally not done. In the case of forced renovation, the internal masonry should also be protected from damage, and corresponding insulation measures should be taken. It is also necessary to insist on the continuous operation to shorten the refurbishment time, and when conditions permit, coke oven gas should be used to supply heat to the furnace.

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Sampling View of Checker Bricks in the Regenerator

Due to the long-term workload, the checker bricks in the regenerator of the coke oven will melt and creep. When the situation is serious enough to affect the normal production of the coke oven, it needs to be replaced.

First of all, from the perspective of the creep checker bricks taken out of the coke oven regenerator, the damaged checker bricks have expanded volume, the loose internal structure of materials, and blocked holes. The severely damaged parts are concentrated in the upper part of the gas regenerator, generally, no more than three layers of bricks and the upper layer is the most serious. Moreover, the upper part of each checker brick is more creeping than the lower part. A factory sampled and inspected the clogged checker bricks, and the changes are shown in Figure 1.

Figure 1 Sampling of clogged checker bricks in a factory

Replacement Measures of Checker Bricks in the Regenerator

Before construction, prepare all necessary tools and refractory materials and install temporary low-voltage lights. Use a special iron plate to cover the upper surface of the waste gas pan connected to the refurbished regenerator to prevent the scrapped bricks from blocking the exchange equipment.

In terms of production organization. During the repair, there will be one buffer furnace number adjacent to each other, and the furnace will not be drawn during the repair. The actual coking time of the repaired furnace number depends on the length of the repair time, the maturity of the coke cake, and the temperature of the combustion chamber. The coking time of the buffer furnace number is set at 36h, the second buffer furnace number is set at 30h, and the coking time difference between adjacent furnace numbers is more than 4h. In terms of furnace temperature management, the standard temperature for repairing furnace numbers and buffering furnace numbers should be lowered accordingly. If it is blast furnace gas heating, it needs to be temporarily stopped. In order to ensure that the furnace body in the combustion chamber area is not damaged, the adjacent units and coke sides are used at the same time, and the coke oven gas is intermittently heated, and the temperature should not exceed 1200°C. After the checker bricks are replaced, the coke oven gas is used to heat up for 2 to 3 hours when the temperature is raised, and then converted to blast furnace gas for heating. If there is no coke oven gas, the supply of blast furnace gas will be temporarily suspended during the maintenance period. The specific measures for the replacement of checker bricks in the regenerator are as follows.

①Before construction, compare the plan to be released. Select the coking time in the middle heat number, and remove the pressure measuring hole with a crowbar. For regenerators with heat shields and single (main) wall small furnace columns, the small furnace columns, beams, and heat shields should be removed before the masonry is removed. And close the corresponding blast furnace gas valve and the blast furnace gas valve on the adjacent machine and coke side. Disengage the mound rod from the exhaust gas stroke and adjust the opening of the exhaust plate flap.
②Pick off the wall tiles from the horseshoe cover, take out part of the checker tiles and continue to remove the sealing wall to the end. Hang the windshield above, insert an iron plate into the gap between the two layers of checker bricks under the replaced checker bricks, and block the chute with a thermal insulation fiber cloth.
③Use a single hook to remove the checkered bricks. If the checker bricks are tightly packed with the single and main walls or the checker bricks are melted together, the furnace head can be smashed with a crowbar and then pulled out, and the deep checker bricks can be smashed and taken out with a live joint flat shovel. As the checker bricks are pulled out, the iron plate gradually moves to the depths of the regenerator.
④ There is one layer of checkered bricks on the burner and fire channel, and wooden planks are laid on it, which is convenient for people to enter and remove. The checker bricks are stripped into a ladder shape, with 4 to 5 checker bricks per layer. All three layers of checker bricks above are required to be replaced.
⑤Before installing the checker bricks, clear out the broken pieces in the holes of the checker bricks. Gunning and repairing the cracks of the single and main walls, and using a multi-section blower to blow the checker bricks until the blower inspection is unblocked. When blowing, pay attention to the blowing hole not to face the single (or main) wall, but to move slowly from the outside to the inside and from the inside to the outside of the checkered brick channel. Strip off the checker bricks at the bottom of the burner and clean the dirt in the grate bricks and the small flue.
⑥ Put the slideway into the heat storage room and push the checker bricks in. The checker bricks are required to be close to each other without skewing or falling over. Strive to align the holes up and down, and do not lean against the furnace wall on both sides.
⑦After the checker bricks are installed, build the inner sealing wall first, and apply the grout to the outer surface to seal, and then build the outer sealing wall. After the temperature of the regenerator is normal, joint again, install the protective cover, restore the small furnace column spring tonnage, etc.

Safety Precautions for Checker Brick Replacement

① When stopping and replacing the heating of the furnace number in the regenerator of the furnace number, it is necessary to determine whether the furnace number with the addition and subtraction cock is closed or not, and confirm that the furnace number is correct.
② During the construction period, the fans in the corridor of the regenerator and the temperature measurement platform of the storage roof should be kept running to maintain ventilation.
③ Prevent scalds during the process of peeling off the wall or checker bricks.
④During the construction period, a dedicated person should be assigned to wear a carbon monoxide alarm to monitor the gas concentration on site.
⑤ When working on the storage roof operating platform, prevent the first-class parts from being bumped. After taking out the checker bricks, they should be stacked to prevent them from falling.
⑥ It is strictly forbidden for idlers to walk in the corridor of the regenerator near the construction to prevent injuries from falling objects.

Measures to Prevent Clogging of Checker Bricks

In order to prevent the checker bricks of the coke oven regenerator heated by blast furnace gas from clogging, the following preventive measures should be adopted.

①Purge the gas regenerator with compressed air regularly.
② The dust content of blast furnace gas should be controlled below 15mg/m3.
③The physical and chemical indexes of clay checker bricks for coke ovens should establish standards. The content of Al2O3 and low melting point substances should be appropriately reduced with reference to foreign standards.
④ Semi-silica checker bricks should be used on the top 3~5 layers of the regenerator of the newly built coke oven.
⑤The checker bricks that have been found to be blocked should be replaced immediately and replaced with semi-silica checker bricks.

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Ceramics Refractories

Apr 1 2021

Modern Ceramic Kiln Refractories Manufacturer

In modern ceramic kilns, as important structural materials such as beams and columns, it is required to have good high-temperature resistance, thermal shock resistance, and creep resistance. As a shed, it is mainly required not to pollute ceramic products, and secondly, it is required to have good creep resistance, thermal shock resistance, and high strength properties. As a manufacturer of high-quality refractory materials for ceramic kilns, the Rongsheng manufacturer provides reliable refractory lining materials for ceramic kiln refractory linings.

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Refractory Materials for Modern Ceramic Kilns

Therefore, silicon carbide is selected for the production of important supporting materials such as beams and columns due to its high strength, high thermal conductivity, and high thermal shock resistance. However, silicon carbide may cause some transition metal ions to undergo oxidation-reduction reactions and contaminate ceramics. Generally, oxide materials are not prone to oxidation-reduction reactions. Therefore, cordierite-mullite is selected for the production of low-stress kiln furniture materials such as slabs and backing plates for low-temperature fast-fired kilns due to its good thermal shock resistance. The mullite-corundum material is selected as the kiln furniture material for high-temperature ceramic kilns because of its good high-temperature resistance and creeps resistance.

A kiln or stove refers to a stove used to burn ceramic objects and sculptures or to fuse enamel on the surface of metal objects. It is generally made of bricks and stones. It can be made into various sizes according to needs and can be operated with combustible gas, oil, or electricity. Electric kilns are easier to control the temperature than kilns that use combustible gas and oil, but some potters and sculptors believe that the temperature of electric kilns rises too fast. (When the temperature in the furnace chamber is measured with a pyrometer (PYROMETER) or a temperature measuring cone (PYROMETRIC CONES), it can be seen through a peephole.)

Heavy Refractory Materials for Ceramic Kilns

The earliest refractory materials used in ceramic kilns were mainly heavy refractory bricks. With the continuous improvement of light insulation refractory materials, heavy bricks are basically used in the refractory lining of tunnel kilns, track kilns, and other kilns of building sanitary ceramics. Unless there are special needs, it is no longer used. Heavy refractory materials are still used in corrosion-resistant kilns, such as frit kilns, shuttle kilns for pigments, and rotary kilns. The purpose is to avoid slag drop and good corrosion resistance. Especially in frit kilns, where the materials are in direct contact with refractory materials, heavy refractory materials should be carefully selected, especially in terms of material, density, and thermal conductivity. The characteristics of this type of kiln are just the opposite of those of tunnel kilns and track kilns. Generally, heavy-duty refractory materials are in the inner layer, while medium-quality refractory materials and insulation materials are in the middle and outer layers.

The heavy refractory materials used in ceramic kilns are similar to those in the glass industry, mainly acid refractory bricks, neutral refractory bricks, and some special refractory bricks. The basis for selecting bricks is mainly determined by the firing temperature of the kiln, the atmosphere, the corrosiveness of the molten material, and the acidity and alkalinity.

What are the Insulation Materials Used in Ceramic Kilns?

The classification of ceramic kilns is very wide. There are differences in shape, heating method, and firing temperature, but they require a lot of insulation materials. Mullite insulation bricks are needed on the inner wall and backing of the hot surface of the kiln. Because of low thermal conductivity, high-temperature resistance, good stability, fine size, it can be processed into various shapes. Therefore, it is suitable for the thermal insulation of the roof, body, and bottom of industrial kilns, and the appearance is beautiful.

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(1) Mullite insulation brick

Lightweight mullite bricks, also known as mullite lightweight insulation bricks, are high-quality high-purity refractory powders. According to the specific gravity of the product, it is a lightweight mullite product synthesized by adding organic compound fillers, vacuum extrusion molding, and high-temperature sintering. It is suitable for the hot surface lining and backing of various industrial furnaces in metallurgy, petrochemical, building materials, ceramics, machinery, and other industries. It has the advantages of low thermal conductivity, low heat capacity, high purity, and low impurity content.

(2) Thermal insulation cotton

The thermal insulation cotton is white in color and regular in size. It integrates the functions of fire resistance, heat insulation, and heat preservation, and does not contain any binder. It can maintain good tensile strength, toughness, and fiber structure when used in a neutral and oxidizing atmosphere. The product has low heat capacity, low thermal conductivity, excellent thermal stability, no chalking within the use temperature, and excellent sound absorption and heat insulation properties. It is suitable for industrial kiln wall lining, backing material, high-temperature pipe insulation, kiln masonry expansion joint, furnace door, etc.

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(3) Ceramic fiber module

The ceramic fiber module is made of a ceramic fiber needle-punched blanket of corresponding material and processed on a special machine according to the structure and size of the fiber component. Its elasticity can compensate for the deformation of the furnace shell so that there is no gap between the components. The elastic fiber blanket can resist mechanical external forces. Because of its lightweight, it has less heat storage when used as a thermal insulation material, and low thermal conductivity brings a high energy-saving effect and has the ability to resist thermal shock.

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(4) Corundum heat storage refractory ball

Refractory balls are made of industrial alumina and refractory kaolin as main raw materials through scientific formula, forming, and high-temperature calcination. Mainly play the role of heat storage. The air volume entering the regenerator passes through the heat transfer of the regenerator, and the temperature rises sharply to hundreds of degrees or even thousands of degrees. The spherical heat storage body has the advantages of good thermal shock stability, large heat storage, high strength, easy cleaning, and reusability.

Rongsheng Refractory Materials for Sale for Ceramic Kilns

Rongsheng is an experienced refractory material manufacturer and sales company. Rongsheng’s refractory products have been sold to more than 60 countries around the world, for example, Russia, South Africa, Kazakhstan, Philippines, Chile, Malaysia, Uzbekistan, Indonesia, Vietnam, Kuwait, Turkey, Zambia, Peru, Mexico, Qatar, etc. To purchase high-quality refractory materials for ceramic kilns, please choose Rongsheng refractory manufacturers. Because the refractory lining materials are purchased directly from refractory manufacturers, the price is cheap and the quality is guaranteed. The refractory manufacturers with guaranteed strength in the company can also guarantee the after-sales service of their products. Rongsheng sells refractory materials for ceramic kilns, and we look forward to cooperating with you.

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Buy High-Quality Refractory Castables

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Replacement Measures of Checker Bricks in the Regenerator

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Measures to Prevent Clogging of Checker Bricks

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Refractory Materials for Modern Ceramic Kilns

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Rongsheng Refractory Materials for Sale for Ceramic Kilns

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