Method for regenerated raw materials from waste cadmium nickel battery based on solvent extraction

A method for regenerating raw materials of waste Nickel-Cadmium batteries based on a solvent extraction comprising the following steps:

• 1) disassembling, rinsing, and shredding an industrial waste cadmium-nickel battery to obtain a material;
• 2) leaching the material with a sulfuric acid solution to obtain a leachate;
• 3) taking the leachate obtained in step 2, adding a first oxidizing agent to the leachate to oxidize Fe2+ in the leachate to Fe3+, adjusting a pH to 0.8-1.8, adding a first extractant, and extracting to obtain a first raffinate and a first organic phase;
• washing the first organic phase with dilute sulfuric acid, and stripping with an oxalic acid solution to obtain an iron oxalate solution;
• 4) adjusting a pH of the first raffinate to 2.0-3.0, adding the first extractant to the first raffinate for a first extraction to obtain a second raffinate and a second organic phase;
• washing the second organic phase with a cadmium sulfate solution, and stripping with a dilute nitric acid solution to obtain a cadmium nitrate solution;
• 5) adjusting a pH of the second raffinate to 4.5-5.5, and adding a second extractant for a second extraction to obtain a third raffinate and a third organic phase;
• washing the third organic phase with a cobalt sulfate solution, and stripping with the dilute nitric acid solution to obtain a cobalt nitrate solution;
• 6) adjusting a pH of the third raffinate to 5.0-6.0, and adding the first extractant to the third raffinate for a third extraction to obtain a sodium sulfate solution and a fourth organic phase;
• washing the fourth organic phase with a nickel nitrate solution, and stripping with the dilute nitric acid solution to obtain a resulting nickel nitrate solution;
• wherein the first extractant is formed by mixing P204 and a solvent oil, and the second extractant is formed by mixing DZ272 and the solvent oil;
• and the first extractant and the second extractant are saponified when used.