细粒铜钼混合精矿磁选分离机理及工业试验研究

Study on Mechanism and Industrial Test of Magnetic Separation of Fine Copper-Molybdenum Bulk Concentrate

云南某铜矿山铜钼混合精矿含钼低,粒度微细,存在铜钼分离浮选药剂用量大、分离难等问题。黄铜矿和辉钼矿存在磁性差异,基于磁介质优化设计原理与方法设计一种新型棒介质,应用COMSOL有限元软件分析了黄铜矿和辉钼矿粒子在棒介质单丝表面的捕获行为,预测了实现磁选分离铜钼混合精矿需要的临界磁感应强度。在试验研究基础上,采用SLon-500脉动高梯度磁选机进行现场工业生产试验,试验期间对-45μm和-28μm分别占92.90%和70.75%及铜、钼品位分别为26.38%和0.352%的铜钼混合精矿进行分离,可以得到产率28.50%、含钼0.080%、铜品位31.50%的合格铜精矿和钼品位0.461%、钼回收率93.52%的钼粗精矿,为后续浮选分离作业减少处理量、药剂消耗及降低生产成本奠定基础。

The copper-molybdenum bulk concentrate of a copper mine in Yunnan province has low molybdenum content and fine particle size,and there are some problems such as large dosage of flotation reagents for copper-molybdenum separation and difficult separation.Chalcopyrite and molybdenite have different magnetic properties.Based on the principle and method of magnetic medium optimization design,a new rod medium was designed.The capture behavior of chalcopyrite and molybdenite particles on the surface of rod medium monofilament was analyzed by COMSOL finite element software,and the critical magnetic induction required for magnetic separation of copper-molybdenum bulk concentrate was predicted.On the basis of experimental study,the industrial production test was carried out by using SLon-500 pulsating high gradient magnetic separator,during which the separation of copper-molybdenum bulk concentrate with-45μm and-28μm accounting for 92.90%and 70.75%respectively and the grades of copper and molybdenum being 26.38%and 0.352%respectively were carried out.The qualified copper concentrate with yield of 28.50%,molybdenum content of 0.080%and copper grade of 31.50%and the molybdenum rougher concentrate with molybdenum grade of 0.461%and molybdenum recovery of 93.52%can be obtained,which lays a foundation for reducing the treatment capacity,reagent consumption and production cost in the subsequent flotation separation operation.