Definition of high-temperature lightweight insulation refractory castable. High-temperature lightweight insulation refractory castables are generally used at temperatures above 1200 °C. Lightweight insulation refractory castables can be classified into low temperature (600-900 °C), medium temperature (900-1200 °C), high temperature (>1200 °C) lightweight insulation refractory castables according to the use temperature.

Application of High-Temperature Lightweight Insulation Refractory Castable

Rongsheng kiln refractory’s high-temperature lightweight insulation refractory castables, a large part of which is directly used for work lining. In particular, it can be used as a working lining for various heating furnaces and heat treatment furnaces, which can greatly save energy.

Therefore, in the lining of kiln, thermal equipment, flue and smokestacks in the industrial sectors such as metallurgy, machinery, petrochemical, electric power and building materials, high-temperature lightweight insulation refractory castables are commonly used as insulation (insulation) layers.

Preparation of High-Temperature Lightweight Insulation Castable

The castable, mixed material prepared from lightweight refractory aggregates and powders, binders and admixtures is called lightweight refractory castable. Lightweight castables are also called lightweight insulation refractory castables due to their low bulk density and low thermal conductivity.

Rongsheng kiln refractory, high-temperature lightweight insulation castable that can be used above 1200 °C, the raw materials are high alumina, mullite, corundum, siliceous and magnesium porous clinker or Light waste bricks, alumina, zirconia and mullite hollow spheres, chromium or zirconium silicate-containing fibres, polycrystalline mullite fibres, etc.

However, due to problems such as the source and price of raw materials, the industry is still more inclined to use high-alumina, mullite porous clinker; a small amount of special use requires alumina or zirconia hollow spheres, high alumina fibers, and alumina fibers.

Binders for High-Temperature Lightweight Heat-Insulating Refractory Castables

The binders for preparing high-temperature lightweight heat-insulating refractory castables include pure calcium aluminate cement, aluminum dihydrogen phosphate, aluminum sulfate and silica sol.