用柠檬酸和六偏磷酸钠降低金川铜镍精矿镁含量

采用柠檬酸作络合剂、六偏磷酸钠为抑制剂，对金川镍矿二矿区矿石进行了提质降镁浮选试验研究，并与现场药剂体系的实验室闭路试验结果进行了对比。试验结果表明，在原矿含镍1.36%、含铜0.86%、含MgO 28.19%的情况下，经1粗2精3扫、中矿顺序返回的闭路处理，最终可获得镍品位为9.68%、铜品位为5.04%、MgO含量为6.33%、镍回收率为84.32%、铜回收率为69.13%的铜镍混合精矿，各项指标均优于现场药剂制度下的实验室闭路试验指标。

Decreasing the Content of MgO in Jinchuan Copper-nickel Concentrate by Citric Acid and (NaP03) 6

Using citric acid as complex agent，sodium hexametaphosphate as inhibitor，the flotation tests on quality increase and magnesium decrease for No.2 Mine Area of Jinchuan Nickel Mine are made and compared with the laboratory closed-circuit tests under on-site reagent system. The tests indicate that for the raw ores containing nickel of 1.36%，copper of 0.86%，MgO of 28.19%，the final nickel-copper mixed concentrate with Ni grade of 9.68%，Cu grade of 5.04%，MgO content of 6.33%，nickel recovery of 84.32% and copper recovery of 69.13% are obtained by the closed-circuit process of one roughing-two cleanings-three scavengings-middles back to the flow-sheet in turn. Each index in the tests above is better than that in the laboratory closed-circuit tests under the system of on-site pharmacy.