使用复合材料耐磨管的经验和经济效益石嘴山矿务局二矿于１９９３年５月建成投产采用块煤重介排矸的重介选煤厂。该选煤厂使用的磁铁矿介质密度高达１．７～１．８ｇ／ｃｍ３，粒度也较粗，－０．０７４ｍｍ级含量占７０％以上，泵送扬程为２８～３０ｍ，流量为２０８ｍ３... Experience and economic benefits of using composite wear-resisting pipe The No.2 Mine of Shizuishan Mining Bureau was completed and put into operation in May 1993. The Dense Medium Coal Preparation Plant uses lump coal gangue waste. The density of magnetite medium used in the coal preparation plant is as high as 1.7-1.8g / cm3, the grain size is also coarse, the content of -0.074mm grade accounts for over 70%, the pumping lift is 28-30m and the flow rate is 208m3. ..