Lightweight Thermal Insulation Castable

Insulating refractory castables

Lightweight and medium-weight thermal insulation refractory castables are castable refractory materials with a true porosity of not less than 45%. They are also called lightweight refractory castables. They include lightweight aggregate refractory castables, foam refractory castables, aerated refractory castables, etc. In practical applications, lightweight aggregate refractory castables are mainly used.

Classification They are divided into three categories according to production method, binder type and lightweight aggregate type.

Lightweight and medium-weight thermal insulation refractory castables are mainly divided into thermal insulation refractory castables prepared with lightweight aggregate and thermal insulation refractory castables made by foam method or aerated method according to production method. According to the classification of binder types, it is the same as general refractory castables. According to the types of light aggregate, it can be divided into expanded perlite, expanded vermiculite, ceramsite, porous clay clinker, lightweight brick sand, hollow alumina balls and other insulating refractory castables. In practical applications, in addition to single light aggregate ingredients, several light aggregates are often used to form insulating refractory castables.

 

Composition Lightweight and medium-weight insulating refractory castables are composed of light aggregate, insulating refractory light aggregate, powder, binder and admixture. Foamed insulating refractory castables are composed of refractory powder, binder and foaming agent, among which refractory powder is composed of clay clinker powder, refractory clay brick powder, fly ash, etc. The binder is mainly silicate cement or aluminate cement, etc. The foaming agent often uses rosin soap foaming agent, saponin fat foaming agent, petroleum aluminum sulfonate foaming agent, etc. The most commonly used is rosin soap foaming agent. Aerated heat-insulating refractory castables are composed of refractory powder, binder and aerating agent. The binder and refractory powder are the same as the materials used in the foam method. In addition, if clay clinker, bauxite clinker or industrial alumina powder is used as powder, phosphoric acid is used as a binder. At the same time, hydrogen produced by the reaction of phosphoric acid and iron also plays an aerating role, making aerated heat-insulating refractory castables.

Features Lightweight and medium-weight heat-insulating refractory castables have high porosity and low thermal conductivity. They have certain refractory properties and good thermal insulation properties. They can be used in industrial kilns and thermal equipment to save energy (reducing heat loss by 20% to 80% compared with general refractory materials), improve kiln operation rate, and reduce equipment load. The use of integral casting or prefabricated molding is convenient for production and installation. Heat-insulating refractory castables are generally prepared with aluminate cement. If it is prepared with silicate cement, its maximum use temperature is 800℃, and if it is prepared with slag silicate cement, its maximum use temperature is 700℃. Among aerated insulating refractory castables, phosphoric acid aerated castables are widely used.

Lightweight and medium-weight heat-insulating refractory castables are made of light refractory aggregates, aluminum silicate microspheres, high-efficiency binders, expansion agents, etc. This product has the characteristics of high compressive strength, low bulk density, low thermal conductivity, good thermal insulation performance and sealing, and convenient construction. It is a new type of thermal insulation material. It is used in various kilns and furnaces and shows excellent thermal insulation and energy-saving effects.

Its physical and chemical indicators are as follows:

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