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Production method of CCEWOOL lightweight mullite insulation brick

Oct. 22, 2018

The CCEWOOL lightweight mullite insulation bricks are widely used in the insulation system of kiln furnaces. This has enabled the high temperature industry to achieve certain environmental protection effects.

CCEWOOL lightweight mullite insulation brick is a kind of thermal insulation material with low bulk density, high porosity and low thermal conductivity. Its low density and low thermal conductivity determine its irreplaceability in industrial furnace applications. However, low density low thermal conductivity and strength are contradictory. As the thermal conductivity of different types of insulation bricks decreases, the corresponding strength is also reduced. And people always hope that there could be a kind of heat insulation brick with low thermal conductivity and high strength. According to the current standards, when the thermal conductivity is 0.13W/m·K, the refractoriness is 800-900°C, the line change under 900℃×8h is no more than 2%, the compressive strength is 0.8MPa, and the bulk density is 0.5 g/cm3.

Production process of CCEWOOL Lightweight mullite insulation brick is as follow.

1. Weigh the raw material according to the ratio, grind the materials into powder, add water to the silica sand and preheat, preheating temperature 45-50℃.

2. Add the rest of the material to the slurry for and stir the mixture. After thorough mixing, the mixed slurry is poured into the mold, heated to 65-70℃ for foaming, the amount of foaming is greater than 40% of the total amount. After foaming the mixture should be allowed to stand for 2 hours under temperature 40℃.

3. After standing, it is steamed in steaming room. The steaming pressure is 1.2MPa, the steaming temperature is 190℃, and the steaming time is 9 hours.

4. Sintering under high temperature, temperature 800℃.

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