内蒙古某低品位铜镍矿石选矿试验

Experimental Study on Mineral Processing of a Low Grade Copper-nickel Ore in Inner-Mongolia

为确定内蒙古某低品位铜镍矿石的开发利用工艺,在工艺矿物学研究的基础上进行了选矿工艺研究。结果表明,矿石中的金属矿物主要为黄铁矿、紫硫镍矿、黄铜矿,脉石矿物主要有斜长石、辉石、角闪石,橄榄石及绿泥石少量。紫硫镍矿多以细粒状伴生在黄铜矿附近,有时与黄铜矿、黄铁矿或单独以几何状充填在脉石矿物骨架中,节理清晰,粒度以中细粒为主,一般为0.30~0.003 mm。黄铜矿多单独产于脉石中,部分与黄铁矿或紫硫镍矿共生,与紫硫镍矿共生关系密切,以他形粒状为主,以中细粒为主,一般为0.30~0.03 mm。矿石在磨矿细度为-0.074 mm占90%的情况下,采用1粗2精1扫优先浮铜,再2粗2精1扫浮镍流程处理,最终获得铜品位为14.76%、铜回收率为82.15%的铜精矿,镍品位为5.86%、镍回收率为84.27%的镍精矿。铜精矿、镍精矿均达到Ⅴ级品质量标准。

In order to determine the development and utilization process for a low grade copper nickel ore in Inner Mongolia, the mineral processing of the ore was studied on the basis of processing mineralogy. The results showed that the metallic minerals in the ore are mainly pyrite, violarite and chalcopyrite. Gangue minerals are mainly plagioclase, pyroxene, hornblende, olivine and less chlorite. Most of violarite is closely associated with chalcopyrite in fine-grained particle, and some of them associated with ehaleopyrite and pyrite or individually were filled into gangues in geometric shape. It occurs in clear texture and middle grain size of 0. 30 to 0. 003 mm generally. Most of ehalcopyrite is generated in gangues, and part of them is associated with pyrite and violarite, even more closely with violarite. Chalcopyrite mainly occurs in anhedral granular shape and middle particle grain of 0. 30 to 0. 03 mm usually. Under the condition of the grinding fineness -0. 074 mm 90% ,and by the process of one roughing, two cleaning and one scavenging to float copper, and two roughing, two cleaning and one scavenging to float nickel,the copper concentrate with copper grade of 14. 76% and copper recovery of 82. 15% , and Nickel concentrate with nickel grade of 5.86% and nickel recovery of 84. 27% , were obtained separately. Both of the copper concentrate and nickel concentrate reached grade V quality standard.