Method for preparing nickel carbonate from nickel sulfate and recycling byproduct sodium sulfate

The invention relates to a method for preparing nickel carbonate from nickel sulfate and recycling a byproduct sodium sulfate, in particular to the technical field of chemical metallurgy, and the method comprises the following steps: adding a sodium bicarbonate solid into a nickel sulfate solution for first reaction to obtain nickel carbonate and a precipitation mother solution, and performing first evaporative crystallization on the obtained precipitation mother solution to obtain sodium sulfate and condensed water; washing the double salt with water to obtain an ammonium sulfate solution and sodium sulfate, and performing secondary evaporative crystallization on the obtained ammonium sulfate solution to obtain ammonium sulfate; mixing the obtained sodium sulfate with a sodium bicarbonate mother solution obtained by preparing sodium bicarbonate for second reaction to obtain a sodium sulfate solution and double salt; the obtained sodium sulfate solution is used for preparing sodium bicarbonate, and the obtain