Efficient and environmentally friendly recovery of precious metal palladium from decommissioned solid oxide fuel cells

Abstract

The invention discloses an efficient and environment-friendly recovery method for precious metal palladium in decommissioned solid oxide fuel cells. In the method, decommissioned solid oxide fuel cells are disassembled and crushed, and then placed in octylphenol polyoxyethylene ether to remove organic substances, washed After drying; the powder obtained in the previous step is lightly burned, and soaked in a deep eutectic solvent for a period of time, filtered, and the filter residue is washed with distilled water several times; the filter residue is placed in the prepared [Hbet][Tf2N] The leaching of Pd is carried out in the ionic liquid; after the leaching is completed, a three-electrode system is constructed with the leaching solution as the electrolyte for the electrodeposition of Pd. After the deposition is completed, the deposition solution is placed in a centrifugal device to separate Pd, and it can be washed and dried. Elemental Pd was obtained. The invention avoids a large amount of use of acid and alkali, and can recover and obtain relatively high-purity noble metal Pd on the basis of 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 of precious metal palladium in decommissioned solid oxide fuel cells. Background technique [0002] With the development of the times, the whole society consumes more and more energy, and people have to focus on cleaner new energy technologies. Among them, fuel cells have attracted people's attention with their excellent performance characteristics. For solid oxide fuel cell (SOFC), its all-solid-state cell structure makes it free from any electrolyte leakage problem, and SOFC directly converts chemical energy into electrical energy, which is not 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 the use ...

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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

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