High alumina bricks are made from high alumina clay, which is mainly composed of boehmite and kaolinite minerals. High alumina brick clay usually uses three levels of ingredients: coarse, medium, and fine. The upper limit of coarse particles is usually 2-3mm, and the addition amount is 40% -50% (for irregular products, the upper limit of coarse particles can be reduced to 2-1mm). The appropriate addition amount of intermediate particles with a diameter of 1-0.1mm is 10% -20% The amount of 0.1mm fine powder added should be controlled between 40% and 50%.
The production of refractory high alumina bricks generally uses soft clay, which has good plasticity. Therefore, the production of high alumina refractory bricks usually uses soft clay as a binder. However, the free SiO2 in clay and the free Al2O3 in high alumina clinker undergo a secondary mullite reaction at 1200 ℃, resulting in significant volume expansion, increased porosity of silicon, and decreased strength. Therefore, the amount of clay powder added to the ingredients should not exceed 5%.
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