辽宁省八家子铅锌矿的银回收率徘徊在65％左右已有三年了。为了结束这种状况,1983年我们做了大量考查和试验研究。发现原矿溢流中易选级别产率小,难选级别产率大,这是影响银回收率提高的一个重要原因。为此我们在磨矿上进行了一些改革,通过减小磨机给矿粒度,清理磨机中废球,改变磨机球比,在二段磨机添加直径20毫米小钢 The recovery rate of silver in the Baji Zi lead-zinc mine in Liaoning Province has been hovering around 65% for three years. In order to put an end to this situation, we made a large number of tests and experimental studies in 1983. It is found that in the ore overflow, the yield of easy-to-choose grade is small and the yield of difficult-to-choose grade is large, which is an important factor that affects the increase of silver recovery rate. To this end we carried out some reforms in the grinding, grinding mill to reduce the particle size, clean up the waste ball in the mill, change the mill ball ratio, in the second paragraph mill diameter 20 mm steel