300 kg grade lightweight mullite brick and preparation technology thereof

The invention discloses a 300 kg grade lightweight mullite brick and a preparation technology thereof. The mullite brick is prepared from, by weight, 5-18% of Suzhou clay, 24-35% of alpha-alumina micro powder, 1-3% of silica fume, 3-8% of knar clay, 8-15% of bentonite, 3-8% of flint clay, 2-9% of zeolite powder, 10-20% of calcium carbonate powder and 12-18% of white cement; in addition, 2-5% of a foaming agent, 75-100% of water and 0.6-1.4% of a dispersant are additionally added by taking the weight sum of the above mentioned components as the calculation basis. The lightweight mullite brick has the advantages of being low in volume density, high in strength, small in heat conductivity coefficient, capable of forming large bricks and the like. 本发明公开了种300kg级轻质莫来石砖及其制备工艺。该莫来石砖采用以下重量百分比组份：苏州泥5-18％，α-氧化铝微粉24-35％，硅灰1-3％，紫木节3-8％，膨润土8-15％，焦宝石3-8％，沸石粉2-9％，碳酸钙粉10-20％和白水泥12-18％；此外，还额外添加了以上组份重量总和为计算基准的以下组份：发泡剂2-5％，水75-100％，分散剂0.6-1.4％。本发明的级轻质莫来石砖具有体积密度小、强度高、导热系数小、可成型大型砖等优点。