Abstract：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 should be higher than 600 ℃ to achieve effective grinding of quartz, and it is usually set between 800 to 900 ℃. The smaller size of quartz is, the higher grinding efficiency is. And calcination time is related to the size of quartz, which is determined by the balance time at which the quartz internal temperature is equal to its externa temperature. Comparing with natural quartz, the grinding efficiency of calcined quartz is greatly improved and the size of its grinding product is finer and more uniform.

Keywords: thermal grinding; quartz; grinding rate; size