Method for joint production of ternary precursor and cobalt carbonate

The invention relates to a joint production method of a ternary precursor and cobalt carbonate, which comprises the following steps: S1, mixing a ternary solution with liquid caustic soda and ammonia water, carrying out liquid phase reaction, and carrying out solid-liquid separation after the reaction is completed to obtain a solid phase and a waste liquid; s2, performing heat treatment on the solid phase in the S1 to obtain a ternary precursor; s2, feeding the waste liquid in the step S1 to a stripping tower, mixing the waste liquid with liquid caustic soda, and heating and stripping to prepare ammonia water; s3, ammonium bicarbonate is used as a precipitator and added into the cobalt salt solution, heating reaction is performed, and precipitates and gas are generated; s4, collecting the gas in S3, and concentrating and purifying to obtain carbon dioxide; filtering and drying the precipitate in S3 to obtain cobalt carbonate; s5, feeding the ammonia water in the S2 and the carbon dioxide in the S4 into an abs