In order to improve the grinding efficiency of quartz,the grinding characteridtics of natural quartz and calcined quartz by thermal treatment was systematically studied. The results show that the grinding efficiency of calcined quartz is improved dramatically in that the physical structure of the quartz can be changed by thermal treatment to reduce its hardness. The main effect factors of the quartz thermal treatment include calcination temperature, time and the size of quartz. Calcination temperature shoul...