利用铝型材厂工业废渣制备莫来石质耐火材料

SYNTHESIS OF MULLITE REFRACTORY USING WASTE SLAG OF ALUMINUM FACTORY

以铝厂污泥和苏州土合成的不同粒径级配的莫来石作为原料,添加少量堇青石作为结合剂,甲基纤维素、水作为添加剂研制优质莫来石耐火材料。通过测定耐火材料的抗折强度、热稳定性、气孔率等性能指标确定出最佳配方。结果表明:No.1配方的0次抗折强度为126.76 kgf/cm2,1次热震抗折强度为81.07 kgf/cm2,10次热震抗折强度为45.07 kgf/cm2。1次热震强度保持率为49.24%,10次热震强度保持率为36.52%,10次热震后气孔率为40.37%,0次热震吸水率为24.76%,0次热震体积密度为1.61g/cm3。

Waste slag of aluminum factory and Suzhou clay were used as the raw materials to synthesize mullite of different size distribution,to which a spot of cordierite was added as binder,methylcellulose and water was added as additives to prepare top quality mullite refractory.Flexural strength,thermal characteristic,porosity,etc.of the refractory were tested to determine its optimal formula.The results showed： No.1 was the optimal formula,the flexural strengths of the sample after 0,1 and 10 thermal shock cycles were respectively 126.76 kgf/cm^2,81.07 kgf/cm^2 and 45.07 kgf/cm^2.The flexural strength retention after 1 and 10 thermal shock quench cycles were 49.24% and 36.52% respectively.The porosity after 10 thermal shock cycles was 40.37%,and the water absorption and bulk density after under no thermal shock were 24.76% and 1.61g/ cm3.