Leaching process is a chemical reaction process, mineralparticle size and concentration also have great impact on the leaching rate.
浸出过程为化学反应过程，矿物粒度、浸取剂浓度对反应速率影响也较大。
2
The force acting on mineralparticle in VFB was specially analysed, and the main parameters interfering the separation of mineral according to bed density were also studied.
Statistical analysis on size distribution of mineralparticle of weathered granite is carried out by using fractal method. The results show that the fracture process of weathering is a fractal one.