| abstract |
A method for recovering precious metals in waste carbon-supported catalysts by utilizing ionic liquids, the method comprising: (1) putting waste carbon-supported precious metal catalysts into ionic liquids, introducing hydrogen chloride gas, and raising the temperature to 50-200° C. in a hydrogen chloride atmosphere, Insulation stirring enables the ionic liquid to fully extract the precious metal components on the surface of the catalyst carrier; then cooled to room temperature to obtain a mixture; (2) the mixture obtained in step (1) is extracted by the Soxhlet extraction method, and after the extraction is completed, the ionic liquid is obtained by filtration /solvent mixed solution and catalyst carrier; evaporate the solvent in the ionic liquid/solvent mixed solution to obtain an ionic liquid mother liquor containing noble metal complexes; (3) after diluting the ionic liquid mother liquor containing noble metal complexes with water, hydrate Hydrazine reduction, solid-liquid separation is carried out after sufficient reaction, the obtained solid is first washed with deionized water, and then base metal impurities are washed with nitric acid to obtain precious metals; the obtained liquid is dried to obtain a regenerated ionic liquid. |