首钢水厂铁矿选厂处理鞍山式贫磁铁石英岩,磨矿流程采用两段磨矿分级回路(一段分级采用φ2000×8800双螺旋分级机、二段分级采用φ500旋流器),细筛流程为二段细筛自循环再磨工艺。1975年前旋流器分级效率为28～32％,采用细筛后,因两段细筛效率低至22～35％,大量筛上产品进入二段球磨机-旋流器-细筛回路,引起细粒恶性循环,旋 Anshan-type lean magnetite quartzite is processed at Shougang Iron Mine’s iron ore processing plant. Two stages of grinding and grading circuits are adopted in the grinding process (one stage adopts φ2000 × 8800 double helical classifier and the other stage adopts φ500 cyclone) For the second fine sieve since the cycle and then grinding process. Before 1975, the cyclone grading efficiency was 28-32%. After the fine screening was adopted, a large number of products on the screen were introduced into the second-stage ball mill - cyclone - fine screening circuit due to the low efficiency of the two-stage fine screening as 22-35% Fine-grained cycle, spin