Efficient and environment-friendly recovery method for precious metal palladium in retired solid oxide fuel cell

• Main Authors: LIU QIUTONG, WANG CHAO, LIU YIHUI
• Format: Patent
• Language: Chinese; English
• Published: 19.03.2021
• Subjects: APPARATUS THEREFOR; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY ORREFINING OF METALS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses an efficient and environment-friendly recovery method for precious metal palladium in a retired solid oxide fuel cell. The method comprises the steps that after being disassembled and crushed, the retired solid oxide fuel cell is put into octylphenol polyoxyethylene ether to remove organic substances, and the retired solid oxide fuel cell is dried after being washed; powderobtained in the previous step is lightly fired and is soaked in a eutectic solvent for a period of time, filtering is carried out, and filter residues are washed multiple times with distilled water;the filter residues are put in prepared [Hbet] [Tf2N] ionic liquid to be subjected to Pd leaching; and after leaching is completed, a three-electrode system is constructed with a leaching solution asan electrolyte for electrodeposition of Pd, after deposition is completed, a deposition solution is put in centrifugal equipment to be separated to obtain Pd, and the simple substance Pd can be prepared after washing and drying