Characteristic Analysis of High-strength Wear-Resistant Castables for Waste Incinerators
High-strength wear-resistant castable is a widely used castable refractory for furnaces. High-strength wear-resistant castables can be used in circulating fluidized bed boilers, corrosion-resistant liners in the chemical industry, wear-resistant liners in the coal industry, blast furnace linings in the steel industry, and garbage incinerator linings. The Rongsheng refractory manufacturer analyzed the characteristics of high-strength wear-resistant castables for waste incinerators based on the characteristics of waste incineration. And specially developed wear-resistant refractory castables for garbage incinerators.
Application of High-strength Wear-Resistant Castables
Generally, high-strength wear-resistant castables for circulating fluidized bed boilers use corundum, silicon carbide, and special grade bauxite as the main raw materials, with superfine powder and compound additives. It has the characteristics of high strength at early medium temperature, good high-temperature performance, stable volume, strong resistance to slag penetration and erosion, erosion resistance, convenient construction, and strong integrity of the lining structure. It is a good wear-resistant material currently used in CFB boilers.
High-strength wear-resistant castables for waste incinerators, low-aluminum mullite, and SiC are selected as aggregates, silica sol, and pure calcium aluminate cement are used as binders, and ultrafine powder and water reducer are added. The sample is mixed according to the ratio of aggregate and powder 67:33, the critical particle is 5mm, and the binder and water reducer are added to the powder. According to the principle of first coarse and then fine, pour it into a mixer, pre-mix for 3 to 5 minutes, then add an appropriate amount of water, stir for 3 minutes, take it out and pour it into the triple test mold, vibrate and shape, and cure, dry and fire.
Characteristic analysis of high-strength wear-resistant castable for a waste incinerator
The following characteristics of high-strength wear-resistant castables for waste incinerators are tested as a reference for the analysis.
Determine the fluidity of the castable;
Measure its physical and chemical indexes at room temperature after treatment at various temperatures, as well as alkali resistance and abrasion resistance;
The acid test is carried out according to the crucible erosion method to detect Cl2 erosion. The test was carried out at 1000 ℃ for 48 h, and humid acid Cl2 gas was introduced to analyze the corrosion surface changes and microstructure of the sample.
The effects of Al2O3/SiO2 value, binder addition, SiC addition, and superfine powder addition on the properties of the castable were studied, and the optimal addition amount was optimized.
The results show:
When the value of Al2O3/SiO2 in the castable is about 0.8, the acid and alkali corrosion resistance of the sample is the best;
Cement-silica sol compound addition and the addition amount is 5%, the effect is the best;
Wear-resistant castables added with SiC have higher drying strength. Although the intensity of medium temperature (1100 ℃) fluctuates, it also maintains a relatively high value. When used at around 1300°C, the oxidation resistance and wear resistance will be effectively improved;
When the addition amount exceeds 15%, due to the fineness of SiC, a continuous phase is formed in the matrix, which can significantly improve the thermal conductivity of the castable. So that the castable has better thermal shock resistance;
When a proper amount of silicon powder is added, the specific surface area of the silicon powder is large, the activity is higher, and the silicon powder has the effect of filling and promoting sintering. In this way, only a small amount of water is needed to make the castable have better rheology and improve the high-temperature strength of the castable.
Application of high-strength wear-resistant castables for a garbage incinerator
By analyzing the characteristics of high-strength wear-resistant refractory castables for tie incinerators, Rongsheng refractory manufacturers, combined with the actual working environment and operating temperature, developed high-strength wear-resistant castables for garbage incinerators. The high-strength wear-resistant castable is used in the garbage incinerator and is mainly used in the wear-resistant parts such as the hearth and the roof of the gasifier. Through many years of operation, no product quality problems occurred in the middle, and the garbage incinerator is operating in good condition. Another incinerator project also used Rongsheng’s high-strength wear-resistant castables. It has been in operation for nearly 2 years without any obvious damage.
Rongsheng is an experienced refractory castables manufacturer. Rongsheng’s refractories have served customers in more than 60 countries. Through continuous accumulation and research and development, Rongsheng has built a new unshaped refractory production line with an annual output of 80,000 tons. Provide high-quality unshaped refractory materials for Rongsheng customers. The Furnaces we serve covers CFB boilers, gasifier equipment in the chemical industry, etc. At the same time, Rongsheng specially developed refractory materials for garbage incinerators by studying the working characteristics of garbage incinerators. For more information about high-strength wear-resistant castables for waste incinerators, please contact us. We will provide you with services according to your specific needs.
