用磨矿动力学参数和选择性破裂函数作为石英、磁铁矿有无选择性碎裂现象发生的判据；讨论了配比对它们的磨矿速率、粒级产率和新生比表面的影响．在磨纯矿物时、磁铁矿比石英易磨，磨矿速率相差较大；在磨纳混合物料时，两者之间存在相互干扰，并且这种干扰随磨矿细度的大小不同而不同，导致了磨矿速率差的减小．但粒度特性方程式却不受干扰． The kinetic parameters of grinding and selective rupture function are used as criteria for the occurrence of selective fragmentation of quartz and magnetite. The effects of mixing ratio on their grinding rate, grain-size yield and freshness ratio are discussed . When grinding pure minerals, magnetite is easier to grind than quartz and its grinding rate is quite different. When mixing mixed materials, the two interfere with each other, and the interference varies with the degree of grinding fineness , Resulting in a decrease in the difference in grinding rate. But the grain size equation is not disturbed.