绿泥石的球磨特性及其破裂参数

Ball grinding characteristic and breakage parameters of chlorite

在相同的球磨条件下,对4种窄粒级的绿泥石进行实验室分批湿式球磨试验。结果表明:4种粒级绿泥石的磨矿动力学都遵循一阶磨矿动力学,球磨0.25~0.5 mm的绿泥石时获得最大的破碎速率函数Si=0.35 min^(-1),正常的破碎粒级范围应该小于0.5 mm;在较短的磨矿时间内,0.25~0.5 mm绿泥石的细粒级产出具有明显的零阶产出特征;采用G-H算法获得0.25~0.5 mm粒级绿泥石的累积破碎分布函数Bij,利用磨矿总体平衡动力学模型,对粒级为0.25~0.5 mm的绿泥石进行球磨模拟仿真计算,试验结果与模拟仿真结果高度一致。

Under an invariant mill environment, batch wet ball grinding studies were carried out by grinding four mono-sized fractions of single mineral of chlorite. The results show that all mono-sized fractions of chlorite follow the first-order breakage mechanism. The maximum breakage rate for chlorite, obtained in the feed size fraction of 0.25-0.5 mm, is 0.35 min^-1. The normal breakage behavior is obtained when the feed size is less than 0.5 mm. The fine fraction output for 0.25-0.5 mm size fractions of chlorite has a clear the zero-order output characteristics at a relatively short grinding time. The cumulative breakage distribution functions for 0.25-0.5 mm size fractions of chlorite are obtained using G-H algorithm. The simulated product size distribution data obtained,using the discrete-size, continuous-time Population Balance Model（PBM）, are consistent with experimental data for 0.25-0.5 mm size fractions of chlorite.