(中南大學(xué) 資源加工與生物工程學(xué)院，長沙410083)
摘 要: 通過浮選實驗、潤濕接觸角測量和Zeta電位測試，考察滑石、綠泥石和蛇紋石3種層狀鎂硅酸鹽礦物的可浮性及其對金川鎳礦中的硫化礦物－黃鐵礦浮選的影響，并研究羧甲基纖維素(CMC)對3種層狀鎂硅酸鹽礦物浮選的抑制與分散作用。結(jié)果表明：3種鎂硅酸鹽礦物表面性質(zhì)與可浮性不同，對硫化礦浮選的影響方式與機理也存在區(qū)別：蛇紋石天然可浮性較差，但由于靜電作用易與黃鐵礦發(fā)生異相凝聚，降低黃鐵礦的可浮性進(jìn)而影響其回收率，CMC可通過調(diào)整礦物表面電性而起到分散作用；滑石與綠泥石并不影響黃鐵礦的可浮性，但由于其天然可浮性相對較好，易進(jìn)入精礦增加MgO雜質(zhì)含量，CMC能調(diào)整礦物表面潤濕性而抑制其浮選。
關(guān)鍵字: 羧甲基纖維素；鎂硅酸鹽礦物；浮選；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
