从炼铜厂炉渣中回收铜铁的研究

针对铜转炉渣中铜铁硅矿物紧密共生、呈细粒不均匀嵌布及渣硬度高、难磨的特点，进行了多种磨矿与选别流程组合的对比试验，最后选用磨矿(-0.043mm 79．6％)-浮选-磁选-浮选中矿与磁性矿合并再磨(-0．040mm99．32％)-再浮-再磁的阶段磨矿阶段选别的流程，其中第一段磁选精矿再磨是铁硅单体分离获得合格铁精矿的关键．在转炉渣含铜1．58％(硫化铜和金属铜占78．68％)、含铁53．54％(磁性氧化铁占28．53％)的情况下，获得铜精矿品位19．82％，回收率85．48％的选铜指标，同时综合回收了渣中磁性氧化铁，得到铁品位62．525％、回收率35．02％、含SiO2 9．94％的合格铁精矿．

Recovery of copper and iron in the converter slag from a copper smelter

In the light of the close intergrowth and fine uneven dissemination of copper, iron,and silicon minerals in copper converter slag as well as the high hardness and difficult re-grinding of the slag, grinding and separating under different grinding fineness are tested. Fi-nally a stage grinding and stage separation flowsheet, which comprises grinding (--0. 043mm up to 79. 6%), flotation, magnetic separation, regrinding for flotation middling andmagnetic mineral together (--0. 040 mm up to 99. 32%), re--flotation, and re--rnagnetic sepa-ration, is adopted to treat the slag. Regrinding for magnetic rough concentrate is importantfor separation of iron and silicon. The feed of the converter slag contains 1. 58% Cu, ofwhich copper sulphide, and copper metal amounts to 78. 68%, and 53. 54% Fe, of whichmagnetic iron oxide amounts to 28. 53%. As a result, the grade of copper concentrate is19. 82% with the recovery of 85. 48%. In the meantime, magnetic iron oxide is also recov-ered. Iron concentrate contains 62. 525% Fe and 9. 94% SiO_2, with the iron recovery being35. 02%.