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

Abstract

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. According to the method, excessive use of acid and alkali is avoided, and the precious metal Pd with higher purity can be obtained through recovery on the basis of the simple process and environmental protection.

Description

technical field [0001] The invention relates to the technical field of recycling and processing of decommissioned batteries, in particular to an efficient and environmentally friendly recovery method for precious metal palladium in decommissioned solid oxide fuel cells. Background technique [0002] With the development of the times, the energy consumption of the whole society is increasing, and people have to focus on cleaner new energy technologies, among which fuel cells have attracted people's attention due to their excellent performance characteristics. For solid oxide fuel cells (SOFC), its all-solid-state battery structure makes it free from any electrolyte leakage, and SOFC directly converts chemical energy into electrical energy without being limited by the Carnot cycle, and has a high Energy conversion efficiency. Coupled with the advantages of low emission and low noise, it has broad application prospects in the field of new energy vehicles. [0003] However, as...

AI Technical Summary

Problems solved by technology

[0003] However, as the use of solid oxide fuel cells is becoming more and more common and the degree of commercialization is getting higher and higher, the number of decommissioned solid oxide fuel cells is gradually increasing. If they are not recycled, it will cause serious waste of resources, especially in precious metal catalysts

However, today’s decommissioned battery recycling technology mainly focuses on proton exchange membrane fuel cells and lithium batteries, and most of them are recycling common metals such as Ni, Cu, Fe, Li, Mn, although the recycling process is gradually becoming more environmentally friendly and mature. , but it is difficult to apply to the recovery field of precious metals

Furthermore, for the recovery of precious metals, most of them are still in the stage of strong acid and strong alkali leaching and incineration, which is not in line with today's green and environmentally friendly development concepts. In addition, research on recovery from decommissioned solid oxide fuel cells is even more are very few, therefore, a kind of green environmental protection recovery process about decommissioned solid oxide fuel cells needs to be developed urgently

Images