关键词: 硅藻土;火山灰活性;结合水率;无氧热活化

Abstract: The effects of grinding, aerobic and anaerobic calcination on the volcanic ash activity of diatomite were studied by the contrast intensity method and combined water rate method, it was characterized by XRD, BET, IR and SEM.The results show that diatomite is mechanical activated for 15 min, the activation temperature of 2 h is 600 ℃, and the maximum activity is reached, the volcanic ash activity index increases from 50.2％ to 80.3％, increased by 30.1％.Water content from 6.24％ to 37.21％, increased by 30.97％.Moreover, under anaerobic conditions the volcanic ash activity of diatomite is higher than that of aerobic thermal activation, and the activity ratio of oxygen free thermal activation is 9.6％ higher than that of aerobic thermal activation, and the binding water rate is increased by 8.22％.

Key words: diatomite;volcanic ash activity;combined water rate;anaerobic activation