采用阴离子膜电解法从红土镍矿常压浸出液中制备金属镍

摘要

以红土镍矿常压酸浸净化液为原料，采用阴离子交换膜与电解结合的方法制备金属镍。分别研究电解液成分、温度、时间、电流密度和pH等因素对阴极电流效率、回收率、能耗以及槽电压的影响。结果表明：含Ni2+溶液浓度为64 g/L、H3BO4浓度为40 g/L、H2SO4浓度为0.1 mol/L、温度为40℃、电流密度为300 A/m2、pH为5.2时，阴极电流效率达到98.47%，能耗为3470 kW·h/t，得到的金属镍纯度达到99.9%以上，能够满足工业上的要求。%Ni was prepared by the method combining anionexchange membrane with electrolysis using nickel laterite atmospheric acid leaching purifying solution as main raw material. The influences of parameters including the electrolyte composition, temperature, time, current density, pH and other factors on the cathodic current efficiency, recovery rate, energy consumption and cell voltage were explored, respectively. The results indicate that the cathode current efficiency and the energy consumption are 98.47%, 3470 kW·h/t at Ni concentration of 64 g/L, H3BO4 concentration of 40 g/L, H2SO4 concentration of 0.1 mol/L, temperature of 40 ℃, pH of 5.2 and cathode current density of 300 A/m2, respectively,and the purity of this nickel can achieve more than 99.9%, which can meet the industrial requirements.