耐火材料废料的粒度对研磨介质性能的影响

Influence of refractory waste particle size on the performance of milling media

以硅酸铝质耐火材料废料为原料，采用冷等静压成型和低温快烧工艺，制备了高性能的含60％Al2O3的陶瓷研磨介质．瓷球的磨损率为建陶行业用国际最高水平95％瓷球的1／3～1／2，体积密度达3．347g·cm^-3．随着耐火材料废料颗粒逐步细化，瓷球的烧成温度下降，体积密度升高，耐磨性提高，晶粒尺寸、气孔率及孔径减小，而且分布趋向均匀化．瓷球的主晶相为刚玉，次品相为钙长石、尖晶石和莫来石，磨损机理以穿晶断裂为主，而且晶粒变小，穿晶断裂的比例增加．

Aluminosilicate refractory waste is used to prepare high performance grinding media containing 60% Al2O3. The ceramic is shaped by cold isostatic and sintered at low temperature and by fast sintering technology. The influence of milling time on the particle size of refractory waste and the particle size on the sintering temperature and performance of the prepared ceramic balls are studied. The results show that with the increasing time, the particle size of the waste decreases, resulting in the decrease of the sintering temperature and the increase of wear resistance and volume density of the prepared balls. The wear rate of the grinding media＇s is 1/3～1/2 of the 95 alumina ceramic ball of the world highest level, and the highest volume density is 3.374 g/cm^3. The main crystal phase of the ceramic ball is corundum, and the secondary phases are anorthite, spinel, mullite and cristobalite. The wear mechanism of the balls is mainly transcrystalline fracture micro-cut, and the transcrystalline fracture ratio increases with the decrease of ceramic particle size.