Method for extracting high-purity silver powder and gold, platinum and palladium from multi-grade recycled jewelry silver

CN122189355APending Publication Date: 2026-06-12金川集团铜贵股份有限公司

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: 金川集团铜贵股份有限公司
Filing Date: 2026-04-10
Publication Date: 2026-06-12

AI Technical Summary

⚠Technical Problem

Existing wet processes for recycling silver jewelry result in low purity silver powder, low direct recovery rate, and are unable to effectively recover gold, platinum, and palladium, while generating nitrogen oxide waste gas, posing a significant environmental challenge.

⚗Method used

After being hydraulically formed, the jewelry silver is evenly distributed and pressed into a plate, which is then placed in a titanium basket for electrolysis. The titanium basket and the anode bag form an electrolysis system, and silver, gold, platinum and palladium are separated through the electrolysis process. The electrolyte is a silver nitrate solution. After electrolysis, the silver powder is obtained by washing and drying with high-temperature pure water.

🎯Benefits of technology

The purity of silver powder was increased to 99.99%, the recovery rate of gold, platinum and palladium was increased, the process flow was simplified, the environmental pressure was reduced, and the standard of GB/T 4134-2021 was met.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a method for extracting high-purity silver powder and gold, platinum and palladium from multi-grade recycled jewelry silver, and particularly relates to a three-step treatment method of "hydraulic press extrusion into a plate-titanium basket electrolysis-silver powder washing and drying" for the multi-grade recycled jewelry silver. The method mainly comprises the following three steps: (1) multi-grade jewelry is extruded into a plate by a hydraulic press; (2) the extruded plate is subjected to electrolysis in a titanium basket; and (3) the electrolytic silver powder is washed and dried. The method has the advantages of short technological process, simple operation, high flexibility, and the like. A large amount of recycled jewelry silver does not need to be accumulated, and the recycled jewelry silver can be mixed with normal electrolytic residual anodes, extruded into a plate, and then subjected to electrolysis in a titanium basket. The method is advanced in technology, and the direct recovery rate of the jewelry silver can reach 99.98%. The platinum, palladium and gold contained in the jewelry silver can also be recovered as anode sludge, and the metal added value is increased. Meanwhile, the method adopts strong current electrolysis, and the operation environment is good. The high-purity silver powder product meeting the requirements of IC-Ag 99.99 in GB / T 4134-2021 can be obtained in only 30 hours.

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