莫来石轻质骨料的制备及性能研究

Preparation and performance lightweight mullite aggregates

以蓝晶石细粉为原料,核桃壳粉为造孔剂,硅溶胶为结合剂,制备了莫来石轻质骨料。研究了煅烧温度(分别为1 300、1 400、1 500、1 600℃,保温时间均为180 min)和保温时间(分别为60、120、180 min,煅烧温度均为1 500℃)对莫来石轻质骨料体积密度、显气孔率、烧后线变化率、物相组成和显微结构的影响。结果表明,在1 500℃保温60 min所得莫来石轻质骨料的综合性能最优,其体积密度为1.18 g·cm^(-3),显气孔率为59.8%,烧后线变化率为2.58%,莫来石相含量为86%(w)。

Lightweight mullite aggregates were prepared with cyanite fine powder as the main raw material,walnut shell powder as the pore forming agent,and silica sol as the binder.Effects of calcination temperatures(1300,1400,1500,and 1600℃for 180 min)and holding times(1500℃for 60,120,and 180 min)on the bulk density,apparent porosity,linear change rate on heating,phase composition,and microstructure of lightweight mullite aggregates were investigated.The results show that the sample insulated at 1500℃for 60 min exhibits the optimum comprehensive properties,with bulk density of 1.18 g·cm^(-3),apparent porosity of 59.8%,linear change rate on heating of 2.58%,and mullite content of 86 mass%.