China Nonferrous Metallurgy

With the nickel concentrate from xxx company as raw material and by reference to the study results and production practice of the chloridizing refining process at home and abroad, the feasibility of adopting the chloridizing leaching-solvent extraction-electrowinning process to produce high-quality cathode nickel has been verified in a laboratory. The test results show that as the nickel concentrate is subjected to Cu replacement and precipitation by adding anode slime, followed by chlorine leaching, under the condition of preferable process parameters, the Cu replacement & precipitation rate is up to 99.8%, and during the chlorine leaching, the leaching rate of Ni, Cu, Fe and Cu reaches 96.02%, 100%, 100% and 63.33% respectively; as the solution after Cu replacement further goes through Fe removal by using hematite method, followed by N235-P204 combined extraction, under the condition of preferable process parameters, the Fe content in the solution after Fe removal is only 0.0031g/L, the contents of ionic metal impurities, except Pb ion, in the raffinate can meet the requirement of the purified solution for electrowinning; the raffinate is further subject to Pb removal using the chlorine+nickel carbonate method, the solution after Pb removal contains Pb of 0.0001g/L, under the condition of preferable electrowinning process parameters, cathode nickel with a purity of 99.99% can be produced.