Nickel ore resources in China are mostly low-grade copper-nickel sulfide ores with high percentage of MgO-containing silicate gangue minerals. Major copper-nickel mines in China, such as Jinchuan Group Ltd. , have been striving to lower the magnesium content of floatation concentrate. Although lots of researches have been done, the depressing of MgO-containing gangue minerals in copper-nickel sulfide ore floatation is not technically controllable. Related literatures on depressing of MgO-conVaining gangue minerals have been reviewed. It is suggested that highly effective composite depressant, that is, a completing agent - depressant combination, should be employed to depress MgO-containing silicate gangue minerals. A complexing agent is used to clean the surfaces of valuable minerals and gangue minerals, which will increase their floatability difference. In the meantime, a selective depressant is applied to depress MgO-containing gangue minerals. This will be the effective approach for depressing MgO-containing silicate minerals in copper-nickel sulfide ore floatation.%我国镍矿石资源主要为富含MgO硅酸盐脉石矿物的低品位铜镍硫化矿.长期以来,以金川公司为代表的主要铜镍矿山,一直将浮选精矿降镁作为选矿技术攻关的重点.尽管国内外研究人员开展了大量的研究工作,铜镍硫化矿浮选过程中MgO脉石矿物的抑制至今未能在技术上找到可控的解决方法.文章对MgO脉石矿物抑制研究的相关文献进行了综述分析,提出采用复合抑制剂,即络合剂-抑制剂组合,先对有用矿物和脉石矿物进行表面清洗以扩大其可浮性差异,再选择性抑制MgO脉石矿物,这将是铜镍硫化矿浮选过程中抑制MgO硅酸盐脉石矿物的有效途径.
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