络合剂-抑制剂联合抑镁浮铜镍试验

为了降低西北某高镁铜镍硫化矿铜镍混浮精矿中氧化镁的含量，以EDTA二钠络合清洗含镁脉石矿物表面吸附的Cu²⁺、Ni²⁺，六偏磷酸钠和JC抑制含镁脉石矿物，对镍品位为1.29%、铜品位为0.87%、MgO含量为29.02%的矿石进行了提质降镁试验。结果表明：采用1粗2精3扫、中矿顺序返回的铜镍混浮闭路流程处理该矿石，最终获得了镍、铜品位分别为8.95%、5.21%，镍、铜回收率分别为82.91%和71.56%，MgO含量为6.13%的铜镍混合精矿；与现场工艺流程相比，优化后的工艺流程更简洁，既减少了磨矿作业段数，又大幅度简化了浮选工艺流程，且混合精矿镍、铜品位分别提高了0.28、0.71个百分点，镍、铜回收率分别提高了0.35、1.38个百分点，MgO含量下降了0.59个百分点，达到了较好的优化工艺流程、提高分选指标的效果。

Experiment of Inhibiting Mg and Floating Copper-nickel by Jointly Using Complexing Agent-Inhibitors

In order to decrease the MgO content in floated copper-nickel concentrate of Northwest copper-nickel sulfide with high magnesium content，the tests on improving quality and decreasing magnesium content for the raw ores containing 1.29% nickel,0.87% copper,29.02% MgO were carried out by using disodium EDTA as Cu²⁺,Ni²⁺ complexing agent and sodium hexametaphosphate and JC as inhibitors for Mg-containing gangues.The results showed that,by the closed-circuit process of one roughing，two cleaning，three scavengings，middlings returning in proper order into the flow,final copper-nickel mixed concentrate with Ni grade of 8.95% ,Cu grade of 5.21%,nickel recovery of 82.91%,copper recovery of 71.56%，and MgO content of 6.13% was obtained.Compared with the on-site beneficiation process，the optimized process could decrease the middles regrinding operation and simplify the flotation process,while the Ni and Cu grade of final copper-nickel mixed concentrate were improved by 0.28 and 0.71 percentage points,and the nickel and copper recovery were improved by 0.35 and 1.38 percentage points respectively.MgO content was reduced by 0.59 percentage points.The optimizing process achieved good effect of beneficiation.