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以某深度碳还原处理后的镍冶炼渣的磁选精矿为研究对象,对其组成以及镍、铜和钴在其中的赋存状态进行了检测和分析,研究了浸出该精矿中铜、镍、钴的可行性。以氨水-碳酸盐缓冲溶液为浸出剂,氧气为氧化剂,分别探讨了物料细度、浸出时间、浸出温度、氨水浓度、铵盐浓度和氧气压力对浸出效果的影响,得出最优浸出工艺为:物料料度为d90=68μm,氨水浓度为3.0 mol/L,碳酸铵浓度为0.5 mol/L,氧气压力为0.3 MPa,温度为60℃,浸出时间为120 min。在此条件下,铜浸出率为62.5%,镍浸出率为10%,钴浸出率为65.8%。并以铜为例,对氨浸试验进行了简要的机理分析。
In this paper, the magnetic separation concentrates of nickel smelting slag after a certain depth of carbon reduction were taken as the research object, the composition and the occurrence state of nickel, copper and cobalt in them were detected and analyzed. The leaching of copper, Nickel, cobalt feasibility. The effects of material fineness, leaching time, leaching temperature, ammonia concentration, ammonium concentration and oxygen pressure on the leaching effect were investigated by using ammonia-carbonate buffer solution as leaching agent and oxygen as oxidant. The optimum leaching process As follows: material d90 = 68μm, ammonia concentration 3.0 mol / L, ammonium carbonate concentration 0.5 mol / L, oxygen pressure 0.3 MPa, temperature 60 ℃ and leaching time 120 min. Under these conditions, the copper leaching rate was 62.5%, the nickel leaching rate was 10%, and the cobalt leaching rate was 65.8%. Taking copper as an example, a brief mechanistic analysis of the ammonia leaching test was carried out.