Plastic refractory is unshaped refractory with a certain degree of plasticity and can be applied by the ramming method. Plastic refractory is usually produced and stored in mud shape won’t crack or spall during use. The deformation coefficient of plastic refractory is between 15%~40%. Plastic refractory is classified by binder types and main material types. By binding type, plastic refractory can be divided into clay bound plastic refractory, phosphate acid bound plastic refractory, aluminum phosphate plastic refractory, and so on. By chemical property, plastic refractory can be classified into miro expansion plastic refractory, abrasion resistance plastic refractory, corrosion resistance plastic refractory, and so on. In this article, we mainly come to learn about the properties and uses of clay refractory plastics.
The ingredients of clay-bound plastic refractory are clay or high alumina aggregate and fines, plastic clay binder, and additives. So clay-bound plastic refractory is also called aluminum silicate plastic refractory. By adequate mixing of the dry material, water is then added into it and fully mixed, then squeezed into brick green body shape material, i.e., clay plastic refractory. Clay plastic refractory has good thermal shock resistance and spalling resistance.
Clay Refractory Plastic Binder
As the binding clay of the plastic binder, ball clay, knot clay, and kaolin are mostly used. Rongsheng refractory manufacturers generally require the bonded clay itself to have better plasticity and sinterability. Clay should have more colloidal particles, high moisture absorption, proper humus content, and fewer non-colloid substances, and low alkali content in the associated minerals. Clay particles should be flat to increase the contact area between particles. Plasticizers can also be added to improve the plasticity of the bonding clay. The plasticizer should be a surface-active substance, which can be adsorbed on the surface of the clay particles or the surface of the ultrafine powder particles to form a slidable interconnection bond between the particles. Materials that can be used as plasticizers for binding clay include lignosulfonate, methylcellulose, carboxymethyl cellulose, polyacrylate, polyvinyl alcohol, naphthalene sulfonate, and the like. However, when using plasticizers, experiments must be conducted to verify their impact on plasticity. Because some plasticizers will affect the plastic shelf life and other physical properties.
Clay Plastic Refractory Physicochemical Index
Item
CPR-A
CPR-B
CPR-C
CPR-D
Al2O3 %
42
47
62
80
SiO2 %
51
48
31
13
Bulk Density(110℃， 24h) g/cm3
2.19
2.25
2.38
2.61
Sintering Linear change rate (1350℃, 3h) %
+0.5
+0.5
+0.7
+0.6
Cold rupture strength(110℃, 24h) Mpa
3.5
3.7
4.1
4.5
Plasticity Index %
15~25
15~25
15~25
15~25
Clay Plastic Refractory Application
Clay plastic refractory is mainly used at the furnace top and furnace wall lining of steel rolling heating furnace, and are also used as the inner lining of all kinds of heat treatment furnaces. As the inner lining of heating furnaces, the service life of clay plastic refractory can reach 5 years or more. As the preheating zone inner lining of the heating furnace, the service life will be more than 10 years.
Rongsheng Refractory Company Main Advantages
Rongsheng Refractory is a professional high-temperature kiln & furnace refractory products manufacturer with 20 years of experience and established a sound pre-sale, in-sale, and after-sale service system.
Pre-sale service: Timely and accurately take in customer’s demand-consult our technical engineers for appropriate products or solutions-communicate with customers and finally confirm the order.
In-Sale Service: Quality control, production progress monitoring, delivery arrangement, production progress customer informing.
