(中南大学 资源加工与生物工程学院，长沙410083)
摘 要: 通过浮选实验、润湿接触角测量和Zeta电位测试，考察滑石、绿泥石和蛇纹石3种层状镁硅酸盐矿物的可浮性及其对金川镍矿中的硫化矿物－黄铁矿浮选的影响，并研究羧甲基纤维素(CMC)对3种层状镁硅酸盐矿物浮选的抑制与分散作用。结果表明：3种镁硅酸盐矿物表面性质与可浮性不同，对硫化矿浮选的影响方式与机理也存在区别：蛇纹石天然可浮性较差，但由于静电作用易与黄铁矿发生异相凝聚，降低黄铁矿的可浮性进而影响其回收率，CMC可通过调整矿物表面电性而起到分散作用；滑石与绿泥石并不影响黄铁矿的可浮性，但由于其天然可浮性相对较好，易进入精矿增加MgO杂质含量，CMC能调整矿物表面润湿性而抑制其浮选。
关键字: 羧甲基纤维素；镁硅酸盐矿物；浮选；抑制；分散
flotation of layered magnesium-silicates
（School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The floatability of three types of layered magnesium-silicates (talc, chlorite and serpentine), the negative effect of magnesium-silicates on the flotation of pyrite (one sulfide mineral of Jinchuan nickel mine) and the depression and dispersion effect of carboxy methyl cellulose (CMC) on the flotation of magnesium-silicates were investigated through flotation tests, contact angle measurements and zeta potential measurements. The results show that the surface properties and floatability of these magnesium-silicates different, and the way how the magnesium-silicates affecting the flotation of sulfides are also different: the natural floatability of serpentine is poor, but electrostatic aggregation occurred between serpentine and pyrite, thus reducing the floatability of pyrite. CMC can disperse serpentine and pyrite by changing the surface electrical property of minerals. Although talc and chlorite cannot affect the recovery of pyrite, they mix in concentrate and then increase the impurity contents of MgO due to their good floatability. CMC depresses their flotation by changing the surface wettability.
Key words: carboxy methyl cellulose; magnesium-silicate; flotation; depression; dispersion
