Method for preparing nickel carbonate from nickel sulfate evaporative crystallization mother liquor

The invention provides a method for preparing nickel carbonate by using nickel sulfate evaporative crystallization mother liquor, an open circuit mode of the evaporative crystallization mother liquor is determined, recycling of the evaporative crystallization mother liquor is achieved, impurity ions enriched in the mother liquor are purified and removed through nickel carbonate preparation, meanwhile, the nickel ion concentration in the leaching process of a nickel system is supplemented, and the nickel carbonate content is increased. The problem of mother liquor open circuit is effectively solved, and the production cost is reduced. 本发明提供一种利用硫酸镍蒸发结晶母液制备碳酸镍的方法，确定了蒸发结晶母液的一种开路方式，实现了蒸发结晶母液的再利用，并通过碳酸镍制备对母液中富集的杂质离子进行净化除杂，同时补充了镍系统浸出过程中镍离子浓度，有效解决了母液开路的问题，降低了生产成本。