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Commonly Used Refractory Castables for Lining of High Temperature kilns
Low-cement and high-aluminum castables are based on the traditional ratio. The particle gradation is adjusted, and different additives are added. Silica powder replaces most of the high-alumina cement, reducing water consumption, increasing medium temperature strength and load softening temperature, and lowering Improve the thermal conductivity and improve thermal stability. It has the advantages of small volume, low porosity, resistance to hydrogen penetration, corrosion resistance, impact resistance, abrasion resistance, and high mechanical strength. The overall structural strength of the furnace body is high, the air tightness is better than the refractory brick masonry, the furnace life is extended, the furnace repair cost is saved, and the economic benefit is significant. Low-cement and high-aluminum castables are widely used in the selection of furnace linings in different parts of power plant boilers, melting and casting furnaces, heating furnaces, soaking furnaces, heat treatment furnaces and induction furnaces.
Corundum wear-resistant castable is one of Rongsheng Refractory’s superior products. This product uses super high-bauxite clinker (high-aluminum aggregate or refractory aggregate) or fused brown corundum with Al2O3 content greater than 90% as the main material, and It is compounded with proper amount of dispersant, coagulant, stainless steel fiber, and compounded according to strict formula. The high temperature main crystal phase is high temperature resistant castable of corundum. The product has many characteristics such as good high temperature strength, wear resistance and erosion resistance, high thermal conductivity, thermal shock resistance, corrosion resistance, and good sealing performance. Products are widely used in circulating fluidized bed boilers, metallurgy, petrochemical, thermal power and other industries.
High-strength wear-resistant plastics are composed of refractory aggregates and powders with a certain particle gradation, adding appropriate binders, and additives (such as coagulants, plasticizers, expansion agents, etc.), and are used for blending with phosphoric acid liquid. The ramming method is adopted for construction, and no mould is required. The modified product has the advantages of strong adhesion, strong plasticity, high temperature strength, good adhesion, corrosion resistance, and good chemical stability. It is widely used to repair the local corrosion parts of various high temperature kilns and has high construction efficiency.
Special castables for boilers are mainly used for castables for wear-resistant parts of boilers. Appropriate silicon carbide and heat-resistant steel fibers that can improve thermal shock resistance are added to the ingredients. It is made of a variety of high-quality refractory materials such as explosion-proof steel fiber to improve baking quality and kyanite powder to prevent volume shrinkage. This product has the advantages of abrasion resistance, high temperature strength, excellent thermal shock resistance, high temperature resistance, and convenient construction. The working environment of the boiler often encounters various dust particles, high temperature gas and other scouring stress. In order to improve work efficiency, it is necessary to use Castables with good grinding properties and special castables for boilers. According to the production environment of the boiler and the degree of wear resistance of each part, the overall lining material is cast, which can extend the age of the furnace. It is widely used in power plant boilers (turning flue, Cyclone separator, material return device, water-cooled air chamber, combustion chamber furnace, ignition air duct, furnace cabinet), industrial boiler (heating boiler, steam boiler and other industrial boilers), garbage incinerators and other parts that are resistant to erosion and damage.
