Environment-friendly treatment process for waste liquid containing nickel and cobalt

The invention discloses an environment-friendly treatment process for nickel-cobalt-containing waste liquid, and belongs to the technical field of nickel-cobalt-containing waste liquid treatment. The treatment process comprises the following steps: removing oil from the nickel-cobalt-containing waste liquid, filtering, adjusting the pH value, enabling the nickel-cobalt-containing waste liquid to flow through extraction resin, and collecting effluent to obtain first waste liquid; carrying out primary multi-stage extraction on the first waste liquid by utilizing a Mextra 84H/Cyanex 272/P204 synergistic extraction system to obtain an organic phase M and raffinate N; performing multi-stage washing on the organic phase M by using sulfuric acid to obtain an organic phase O and a washing solution P; mixing the organic phase O with sulfuric acid, and carrying out reverse extraction to obtain an organic phase R and raffinate S; adjusting the pH value of the raffinate S, and extracting with P204 to obtain raffinate R a