通过1966～1978年的统计,杨家杖子矿务局的矿石贫化率多在30％以上。围岩的采出和混入矿石中,不仅增加了无益的处理矿量和生产成本,而且还危害选矿生产过程。围岩混入类型及其比例的变化,是引起矿石可选性频繁变化的重要因素之一。因此,研究围岩的赋存和产出;研究围岩的性质和特点;研究围岩的可磨性和可浮性;研究围岩混入的生产实践和克服围岩影响的工艺条件等是完全必要的。 According to the statistics from 1966 to 1978, Yangji Zizi Mining Bureau’s ore depletion rate more than 30%. Surrounding rock mining and mixing into the ore, not only increase the useless treatment of ore and production costs, but also endanger the beneficiation process. Changes in the types and proportions of surrounding rock mixing are one of the important factors that cause frequent changes in the ore selectivity. Therefore, studying the occurrence and output of the surrounding rock, studying the properties and characteristics of the surrounding rock, studying the grindability and floatability of the surrounding rock, studying the production practice of surrounding rock intrusion and the process conditions to overcome the influence of the surrounding rock are completely necessary.