Nickel ore resources in China are mostly low-grade sulfide ores with high percentage of MgO-containing silicate gangue minerals.Flotation is the main way to concentrate copper and nickel metal.However,the percentage of MgO in flotation concentrates is generally high.Flash smelting requires MgO content must be less than 6.5％.High content MgO in concentrate may cause smelting furnace temperature rise,slag viscosity increase,furnace junction,difficulty in slag separation,which results in lower smelting recovery rate and higher smelting cost.In this regard,the domestic and foreign researchers have done extensive studies.But the problem that reducing MgO content leads to high loss rate of copper and nickel is widespread.Reducing MgO content in the concentrate of copper-nickel sulfides is a difficult problem in mineral processing.The research progresses on reducing MgO in the flotation concentrate of copper-nickel sulfides were summarized in this paper,and the reduction mechanism and development trend were also analyzed.%我国铜镍矿石资源主要为富含MgO硅酸盐脉石矿物的低品位硫化矿.浮选是实现铜、镍金属富集的主要途径,然而浮选精矿普遍存在MgO含量过高的问题.闪速熔炼要求MgO含量必须低于6.5％,精矿中高含量的MgO会导致冶炼炉温升高、炉渣粘度增大、炉子结瘤、渣相分离困难,导致回收率降低和冶炼成本增加.对此,国内外科研人员做了大量研究,但是普遍存在降低镁含量的同时铜镍损失率过大的问题,降低铜镍硫化矿精矿中镁含量一直是选矿的技术难题.本文就国内外铜镍硫化矿浮选精矿降镁研究进展进行了总结概述,分析了降镁机理并提出了发展趋势.
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