陕西某镍矿石属岩浆熔离型低品位硫化镍矿石，镍品位为0．53%。由于矿石中的主要脉石矿物蛇纹石和滑石易泥化、可浮性好，且有用矿物和脉石矿物难以充分单体解离，因此，现场采用3粗2扫1精1扫精、中矿顺序返回闭路流程仅能获得镍品位为5．12%、镍回收率为68．40%的镍精矿。为提高资源的利用率和企业的效益，对该矿石进行了电化学调控浮选试验。结果表明，以DHN为电化学调控剂，在磨矿细度和选矿工艺流程不变的情况下，获得了镍品位为5．20%、镍回收率为73．78%的镍精矿，与现场精矿比较，镍品位提高了0．08个百分点，但镍回收率大幅度提高了5．38个百分点。该提高精矿指标的方案不仅效果突出，而且便于在现场实施。%A certain magmatic liquation nickel sulfide ore is from Shaanxi Province with nickel grade of 0. 53%. Serpen-tine and talc,as the main gangue minerals,is easy to be slimed and have good floatability,and the valuable minerals are not easy to be liberated from the gangues. By adopting the process of three roughing-one cleaning-two scavenging and middling back to the flowsheet in turn,nickel concentrate could be obtained with only 5. 12% Ni and 68. 40% recovery. In order to in-crease the resources utilization and enterprise's benefits,electrochemical control flotation experiments were carried out. The re-sults indicated that:using DHN as electrochemical control agent,nickel concentrate with nickel grade of 5. 20% and recovery of 73. 78% was obtained under the same grinding fineness and process. Compared with the on-site concentrate,nickel grade was increased by 0. 08 percentage points,while the recovery rate was increased by 5. 38 percentage points. The method has good performance in improving the concentrate amd is easy to be put into practice as well.
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