High Alumina Refractory Brick

The high-alumina bricks produced by our company can be divided into multiple varieties according to different alumina content and usage purposes, mainly ordinary high-alumina bricks, phosphate-bonded high-alumina bricks for cement kilns, and anti-stripping high-alumina bricks, which are widely used in thermal equipment such as glass kilns, blast furnaces, hot blast furnaces, electric furnaces, and cement kilns.

 

High-alumina refractory materials refer to sintered products containing more than 46% of Al2O3, aluminosilicate or pure alumina. The use of high-alumina bricks in glass tank furnaces is relatively small, accounting for only 1% of the total weight of refractory materials. It is mainly used for refractory accessories such as stirring paddles, mixing barrels, punches, etc. for the working pool wall, material channel, and feeder.

1. Raw materials

The raw materials of high-alumina refractory materials are mainly natural raw materials and artificial synthetic raw materials.

The natural raw materials mainly include diaspore (Al2O3·H2O), gibbsite (Al2O3·3H2O), sillimanite (Al2O3·SiO2 containing Al2O362.9%, SiO237.1%), and isomers of kyanite and sillimanite.

Artificial synthetic raw materials are synthetic minerals, which are generally made by chemical methods, using aluminum hydroxide, aluminum hydride, selected kyanite and clay minerals for synthesis. These synthetic minerals mainly include mullite 3Al2O3·2SiO2 synthesized by sintering and electrofusion, a mixture of α-corundum (Al2O3) and mullite synthesized by electrofusion, and α-corundum manufactured by sintering.

2. Chemical composition

High alumina bricks made from different raw materials have different compositions. The Al2O3 content can range from 46% to nearly 100%. The SiO2 content can range from 0.5% to 47%.

3. Crystalline phase composition

The crystal phase composition of high alumina bricks varies with the Al2O3 content. They mainly contain sillimanite, mullite, corundum, and also contain some quartz and cristobalite. Bricks generally have a glass phase composed of Al2O3, SiO2 and other oxides.

Note: The indicators in the table are typical values of standard bricks.

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