A method for recovering hafnium and impurity metals from a hafnium-containing waste residue, comprising the following steps:
- (1) adjusting acidity of an acidic solution of the hafnium-containing waste residue to 1 mol/L to 3 mol/L, removing a resulting residue through filtration, and adding a complexing agent to a resulting mother liquor to obtain a material solution;
- (2) conducting extraction with a mixture of an acidic phosphorus extractant, sulfonated kerosene, and sec-octanol as an organic phase and the material solution obtained in step (1) as an aqueous phase to obtain a hafnium-loaded organic phase and an impurity metal ions-containing aqueous phase;
- purifying the hafnium-loaded organic phase with a sulfuric acid solution;
- and subjecting a purified hafnium-loaded organic phase to stripping with a stripping liquid to obtain a hafnium-containing stripping solution;
- (3) adding a precipitating agent to the hafnium-containing stripping solution obtained in step (2), filtering to obtain a precipitate, and washing and burning the precipitate to obtain hafnium oxide;
- (4) precipitating the impurity metal ions-containing aqueous phase obtained in step (2) with a strong alkali;
- washing a resulting precipitate to remove the complexing agent to obtain precipitates of the impurity metal ions;
- and adding a sulfuric acid solution to adjust acidity of a resulting solution from the precipitates of the impurity metal ions and the sulfuric acid solution to 1 mol/L to 5 mol/L and to obtain a solution of the impurity metal ions;
- (5) conducting extraction with a mixture of an acidic phosphorus extractant, sulfonated kerosene, and sec-octanol as an organic phase and the solution of the impurity metal ions obtained in step (4) as an aqueous phase to obtain an impurity metal ions-loaded organic phase;
- purifying the impurity metal ions-loaded organic phase with a sulfuric acid solution;
- and subjecting a purified impurity metal ions-loaded organic phase to stripping with a stripping liquid to obtain an impurity metal ions-containing stripping solution;
- and
- (6) adding a precipitating agent to the impurity metal ions-containing stripping solution obtained in step (5), filtering to obtain a precipitate, and washing and burning the precipitate to obtain oxides of the impurity metals;
- wherein in step (1), the acidic solution of the hafnium-containing waste residue is obtained by dissolving the hafnium-containing waste residue in sulfuric acid and ammonium sulfate;
- and
- in step (2), the stripping liquid is at least one selected from the group consisting of an oxalic acid solution, a sodium carbonate solution, and an ammonium bicarbonate solution.