Hydrometallurgical process for recovering palladium from spent catalyst
Through a multi-step hydrometallurgical method, including calcination, reduction, leaching and treatment steps, the existing palladium recovery methods are solved, and efficient and economical palladium recycling is achieved, and the recovered palladium can be used for the production of fresh catalysts.
Patent Information
- Application Number
- CN202380055921.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-07-26
- Filing Date
- 2023-07-25
- Publication Date
- 2025-03-18
AI Technical Summary
The existing palladium recycling methods have problems such as high energy consumption, high CO2 emissions, high investment costs and low palladium recovery. Especially when dealing with specific catalysts, the hydrometallurgy method is not efficient, and the impurities in the carrier affect the recovery efficiency.
A multi-step hydrometallurgical process is employed, including calcining the spent catalyst, reducing with a reducing agent, leaching palladium through a leaching medium, treating the liquid with a reducing agent and alkali metal hydroxide, recovering sponge palladium by filtration, and optionally treating sponge palladium into a palladium solution.
A palladium recovery rate of at least 99.5% is achieved, the method is simple and cost-effective, can be completed on site, and the recovered palladium can be used directly to produce fresh catalysts.