抄録
Highly loaded coal water mixture (CWM) was prepared using several ball mills. Kinetics on size reduction rate of coals was studied. Breakage rate of coals was found to obey the first order kinetics with respect to weight fraction more than 200 mesh and the relationship between rate constant and hold-up was given.
The critical speed which gives the maximum mill capacity in highly loaded CWM wet grin-ding is smaller than that in dry communition.
Mill capacity can be increased by the optimization of CWM hold-up and the lifted angle of crushing balls. CWM mixing condition in continuous system changes from complete mixing to plug flow as the feed rate of raw materials increases. The ball mill capacity can be increased by keeping plug flow of CWM in a ball mill.
