A process for the recovery of silver from silver-containing materials

CN122303596APending Publication Date: 2026-06-30GANJIANG INNOVATION ACAD CHINESE ACAD OF SCI

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: GANJIANG INNOVATION ACAD CHINESE ACAD OF SCI
Filing Date: 2026-05-06
Publication Date: 2026-06-30

AI Technical Summary

Technical Problem

Existing methods for recovering silver from silver-containing materials suffer from low recovery rates, the generation of toxic gases, and high reagent costs. In particular, the nitric acid method generates harmful nitrogen oxide gases during leaching, and hydrometallurgical methods such as the thiosulfate method and the thiourea method suffer from low leaching efficiency and high reagent costs.

Method used

Silver is leached using Fe(III) oxidation coupling complexation via electrochemical or chemical-electrochemical coupling methods. This method utilizes Fe(III) and complexing agents such as citric acid, acetic acid, succinic acid, or tartaric acid to achieve efficient silver recovery. Furthermore, the leaching agent is regenerated through electrolytic recycling, avoiding the use of nitric acid as an oxidant and reducing the generation of toxic gases.

Benefits of technology

It achieves efficient silver recovery, improves the recovery rate, reduces reagent consumption costs and wastewater treatment costs, and the leaching agent is recyclable, making it environmentally friendly and suitable for industrial applications.

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Abstract

This invention provides a method for recovering silver from silver-containing materials. The method includes: (1) leaching the silver-containing materials with a leaching agent to obtain leaching residue and silver-containing leachate, wherein the pH of the silver-containing leachate is ≤2; the leaching agent includes Fe(III) and a complexing agent, wherein the Fe(III) concentration is ≥0.1 mol / L, and the complexing agent includes any one or a combination of at least two of citric acid, acetic acid, succinic acid, or tartaric acid; (2) extracting silver from the silver-containing leachate obtained in step (1) and recycling the leaching agent, the method including method A or method B. The method achieves efficient recovery of Ag (high recovery rate) and recycling of the leaching agent, avoiding the release of toxic and harmful NO gas. x The generation of [product name] significantly reduces reagent consumption costs.

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