磨矿产品粒度特征中T_(75)和t_(10)的拟合关系

Fitting Relationship between T_(75) and t_(10) in the Particle Size Characteristics of the Grinding Product

磨矿产品粒度特征在磨矿选别中具有重要意义。采用磁铁矿为试验样品,进行批次磨矿试验,通过分析各粒级样的磨矿产品粒度特征和能耗特征,将国内常用细度指标T_(75)与国际常用细度分析指标t_(10)进行对比。t_(10)、T_(75)与磨矿时间的线性拟合结果表明,t_(10)、T_(75)与磨矿时间t之间有很好的收敛性,其中T_(75)粗粒级增加的趋势相近,且较细粒级增加缓慢;比能量测试结果表明,t_(10)、T_(75)与磨矿比能量的线性拟合也有很好的收敛性,且在生产相同T_(75)时粒级越小所需能耗越低。试验证明可以用T_(75)替换t_(10)进行磨矿产品的粒度分布特征分析,通过Tx-T_(75)细度曲线建立起矿物的粒度分布关系。根据-75μm的累积产率计算,可以得出其他粒级的累积产率百分比,对国内磨矿产品粒度特征研究具有借鉴意义。

The particle size characteristics of grinding products were of great significance in grinding and separation.Batch grinding tests were carried out using magnetite as the ore sample,and the particle size characteristics and energy consumption characteristics of the grinding products of each particle size sample were analyzed,and the commonly used domestic fineness index T_(75)was compared with the internationally used fineness analysis index t_(10).The linear fitting results of t_(10),T_(75)and grinding time showed that there was good convergence between t_(10),T_(75)and grinding time t,in which the coarse particle size of T_(75)increased similarly and more slowly than that of the fine particle size.The results of the specific energy test showed that the linear fit between t_(10),T_(75)and grinding energy also had good convergence,and the smaller the particle size,the lower the energy consumption required to produce the same T_(75).It was demonstrated that the size distribution characteristics of the grinding product could be characterized by replacing t_(10)with T_(75),and the size distribution relationship of the minerals was established by the Tx-T_(75)fineness curve.Based on the cumulative yield calculation of-75μm,the cumulative yield percentage of other particle size classes can be derived,which was of reference for the study of particle size characteristics of domestic grinding products.