Co-extraction process for comprehensive recovery of copper and manganese in wet process

The invention relates to the technical field of hydrometallurgy, and discloses a copper and manganese co-extraction process for wet comprehensive recovery, which comprises the following steps: S1, crushing an electronic element to be recovered, adding the crushed electronic element into an acid solution, heating, and introducing SO2 for treatment to obtain a leaching solution; s2, leach liquor is introduced into a multi-stage counter-current extraction system for extraction; s3, the extraction phase flows out of a light phase outlet of the multi-stage counter-current extraction system and then is subjected to reverse extraction through sulfuric acid, and a mixed solution is obtained; and S4, reduced iron powder is added into the mixed solution for a reaction, the solution obtained after the reaction is filtered and washed, filter residues are active copper powder, filtrate is a manganese-containing solution, and separation of copper and manganese is completed. Compared with a single extraction agent, the comp