Method for extracting manganese metal from vanadium precipitation wastewater and vanadium extraction tailings

The invention relates to a method for extracting manganese metal from vanadium precipitation wastewater and vanadium extraction tailings, belonging to the technical field of metallurgical and chemical industries. The method for extracting manganese metal from vanadium precipitation wastewater and vanadium extraction tailings comprises the following steps of (1) mixing vanadium precipitation wastewater and vanadium extraction tailings, heating to 60-80 DEG C, and carrying out solid-liquid separation after reacting by stirring to obtain a first filtrate and residues; (2) adding a reducing agent into the first filtrate to reduce pentavalent vanadium in the solution into tetravalent vanadium, and then, filtering to obtain a second filtrate; (3) adding an antioxidant into the second filtrate, and reacting at the temperature of 50-60 DEG C to oxidize the unreacted reducing agent in the step (2); (4) adding activated carbon or suspended matters or suspended particles in a polyacrylamide adsorption solution, and then, filtering after uniformly stirring to obtain a third filtrate; and (5) adding selenium dioxide or sulfurous acid into the third filtrate to electrolyze to obtain manganese metal and an electrolytic anode solution. The invention provides an effective approach for recovering manganese resources in the vanadium precipitation wastewater and the vanadium extraction tailings.