The invention discloses a comprehensive
recovery method of waste
sodium-
ion batteries, which comprises the following steps: mixing and
grinding battery black
powder and a pre-leaching agent, adding a
reducing agent and
ammonia liquor for leaching, carrying out
solid-liquid separation to obtain a
leachate and a
solid, adding acid into the
solid for dissolving, carrying out solid-liquid separation to obtain carbon residue and filtrate, adding alkali into the filtrate for adjusting pH, and separating to obtain aluminum
hydroxide, alkali is continuously added into the filtrate to adjust the pH,
manganese hydroxide is obtained through separation, a first
oxidizing agent, a chelating agent and alkali are added into the
leachate,
ammonia distillation and solid-liquid separation are carried out, and a
cobalt-containing insoluble substance and a
nickel-containing chelate solution are obtained. According to the method, the battery black
powder and the pre-leaching agent are subjected to
ammonia leaching, Mn and Al in a
reaction system are precipitated, Na, Ni and Co are still stored in the leaching agent, the separation and
recovery difficulty of valuable
metal compounds in the leaching agent can be reduced, the subsequent
precipitation and separation procedures are greatly reduced, then a chelating agent and
nickel are utilized for generating a chelate,
nickel and
cobalt in the solution coexist in the form of different substances, and the separation efficiency is improved. Therefore, high-efficiency separation of nickel and
cobalt is realized.