柠檬酸在蛇纹石与镍黄铁矿浮选分离中的作用  

Effect of Citric Acid on the Flotation Separation of Serpentine from Pentlandite

作　　者：冯博[1,2] 朱贤文[1] 周利华[1] 

机构地区：[1]江西理工大学江西省矿业工程重点实验室,江西赣州341000 [2]西部矿业股份有限公司青海省高原矿物加工工程与综合利用重点实验室,西宁810006

出　　处：《有色金属工程》2016年第5期44-48,共5页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助(51404109);江西省科技厅自然科学基金资助(20142BAB216021);江西省教育厅基金项目(GJJ14425);中国博士后科学基金(2015M582759XB);江西理工大学博士基金项目(jxxjbs13020)

摘　　要：考察了柠檬酸在蛇纹石与镍黄铁矿浮选分离中的作用,分析了柠檬酸的作用机理。结果表明,在弱碱性条件下,蛇纹石的加入降低了镍黄铁矿的回收率,而柠檬酸处理后的蛇纹石不会影响镍黄铁矿的浮选。机理分析表明:蛇纹石与镍黄铁矿表面带有相反电荷,能通过静电作用罩盖在镍黄铁矿表面,影响其浮选;柠檬酸能够溶解蛇纹石表面荷正电的镁离子,使蛇纹石表面电位发生变化,此时,蛇纹石与镍黄铁矿之间存在较强的排斥作用,从而减弱蛇纹石在镍黄铁矿表面的附着,消除其对镍黄铁矿的抑制作用。The effect of citric acid on the flotation separation of serpentine from pentlandite was investigated and the mechanism was discussed. The results showed that the hetero-aggregation between serpentine and pentlandite results in the attachment of serpentine slimes on pentlandite surface and changed the surface characteristics of pentlandite,thus decreased the pentlandite flotation recovery.However,the serpentine leached by citric acid doesn＇t influence pentlandite flotation. The mechanism studies demonstrate that citric acid can dissolve magnesium ions from serpentine surface and adjust the surface potential of serpentine,thus changes the interaction energy between serpentine and pentlandite particles from attractive energy to repulsive energy and eliminate the depression effect of serpentine to pentlandite.

关 键 词：蛇纹石 镍黄铁矿 异相凝聚 柠檬酸 

分 类 号：TD923.14[矿业工程—选矿] TD954