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一、细筛再磨工艺在黑色金属矿选厂的应用细筛是六十年代后期发展起来的分离细粒物料的一种选分设备。我国自72年大孤山铁矿选矿厂用细筛再磨方法提高磁选铁精矿品位的工业试验获得成功后,已有20多个铁矿的磁选厂进行了细筛再磨工艺流程改造。据统计,铁矿石磁选厂,特别是处理鞍山式贫磁铁矿的选厂,采用细筛再磨工艺,精矿品位可提高1—6％;而在取得相同精矿品位条件下,磨机能力可提高10％。据计算,生产选厂进行细筛自循环再磨流程改造的基建费为0.05—0.2元/吨原矿,生产费用为0.3～0.8元/吨原矿。而进行细筛单独再磨流程改造的基建费也只有0.5—1.3元/吨原矿,生产费用只增加0.6—2.5元/吨原矿。但铁精矿品位却可增加1—3％或2.5～6％。由此
First, the fine mesh resurfacing process in the selection of ferrous metal ore mill fine sieve is the late sixties developed a separation of fine-grained material sorting equipment. After the success of the industrial test to improve the grade of magnetic separation iron concentrate with the method of fine sieve re-grinding in Dagushan Iron Ore Concentration Plant in China in 72 years, more than 20 iron ore magnetic separation plants have been subjected to the fine sieve regrinding process Transformation. According to statistics, the iron ore magnetic separation plant, especially the Anshan-type lean magnetite processing plant, the use of fine sieve resurfacing process, concentrate grade can be increased 1-6%; and access to the same concentrate grade conditions, Mill capacity can be increased by 10%. It is calculated that the capital construction cost of the mill for fine sieve self-recycle and regrinding is 0.05-0.2 yuan / ton ore, and the production cost is 0.3-0.8 yuan / ton ore. The re-grinding fine mesh sieve reconstruction process costs only 0.5-1.3 yuan / ton of ore, the cost of production increased by only 0.6-2.5 yuan / ton of ore. However, iron ore grade can increase 1-3% or 2.5 ~ 6%. thus