Production process of lightweight thermal insulation brick
3. Using traditional foam method to make anorthite thermal insulation bricks
Using kyanite as the main raw material and white cement as the binder, anorthite combined with mullite lightweight heat-insulating refractory bricks have been developed. Anorthite and mullite thermal insulation material is a composite material with mullite as the main crystal phase and anorthite as the binding phase. The melting point of anorthite is only 1550℃, but it has the characteristics of small thermal expansion coefficient and low thermal conductivity. Therefore, the anorthite and mullite heat insulation refractory material composite not only have the advantages of low thermal conductivity of anorthite, but also have the characteristics of high use temperature of mullite products, and also have a lower sintering temperature. , Higher strength and better thermal shock stability.
Anorthite combined with mullite heat insulation material is formed by foaming method. First, make foaming agent, synthesize rosin soap with rosin and sodium hydroxide, add bone glue to make stable foam. Secondly, add water to make kyanite and white cement powder into slurry. Then, add foam and stir and then cast into shape. Then, curing, drying, and firing are performed to obtain a green body. Finally, the finished product is obtained after cutting, fine grinding, and inspection.
