两段分级已肯定在许多方面超过了一段分级。这些优点是: 1.分级的精确度较好; 2.磨矿能量消耗较少; 3.细粒产品颗粒粒度分布的范围絞窄; 4.矿泥中细粒产品占的比例较小; 5.减少了细粒产品的比表面积; 6.改善了下一辺工序的浮选速度; 7.有用矿物的回收率和品位较高。本文的目的是根据芬兰奥托昆普公司哈马 The two stages have been affirmed in many ways over a period of grading. These advantages are: 1. Grading accuracy is better; 2. Less grinding energy consumption; 3. Narrowing the range of particle size distribution of fine grain products; 4. Small proportion of fine grain products in slime; . Reduce the specific surface area of ​​the fine product; 6. Improve the flotation speed of the next process; 7. The recovery and grade of useful minerals are higher. The purpose of this article is based on the Finnish Outokumpu company Hama