Silver electrolyte purification and silver replenishment method based on silver sludge recycling

By employing pretreatment, selective dissolution, impurity chelation purification, and gradient reduction silver replenishment processes for silver slag recycling, the problems of reduced silver ion concentration and impurity accumulation in silver electrolytes have been solved. This has enabled efficient and low-cost silver electrolyte purification and replenishment, thereby improving the purity and production stability of electrolytic silver products.

CN122105537APending Publication Date: 2026-05-29CHIFENG YUNTONG NON FERROUS METAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHIFENG YUNTONG NON FERROUS METAL CO LTD
Filing Date
2026-01-19
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In the existing silver electrolytic refining process, the decrease in silver ion concentration and the accumulation of impurity ions in the electrolyte lead to a decrease in conductivity and an increase in cell voltage, which affects the purity of silver products. Furthermore, the existing silver replenishment and purification processes are costly, cumbersome, and do not fully utilize resources.

Method used

The method of reusing silver sludge involves pretreatment, selective dissolution, impurity chelation purification, and gradient reduction to replenish silver. The composite solvent of nitric acid and hydrogen peroxide is used to dissolve elemental silver under mild conditions, and a composite chelating agent and ammonium sulfite reducing agent are used for purification and replenishment of silver, achieving simultaneous purification and replenishment of silver.

Benefits of technology

This technology enables efficient purification and precise silver replenishment of silver electrolyte, reducing costs, improving resource utilization, simplifying operating procedures, enhancing the purity and production stability of electrolytic silver products, and reducing energy consumption and pollution emissions.

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Abstract

The present application relates to silver electrolytic refining technical field, specifically to a kind of silver electrolyte purification and silver replenishment method based on silver residue recycling, comprising the following steps: silver residue of silver anode slime processing procedure is broken, grinds, dries;Pretreated silver residue is mixed with composite dissolving agent and reacts, filtration obtains silver-containing dissolving solution and insoluble residue;Silver-containing dissolving solution is added to composite chelating agent, and filtration obtains purified silver-containing liquid;Purified silver-containing liquid is slowly added to silver electrolyte to be replenished with silver, while droping reducing regulator, make silver ion concentration in electrolyte stable at 100-150g / L;After silver replenishment and purification are completed, silver ion concentration and impurity ion content in electrolyte are detected, when impurity ion content exceeds 0.1g / L, return step (3) and carry out secondary chelation purification;When silver ion concentration is less than 100g / L, repeat step (4) and add purified silver-containing liquid.The present application realizes the synchronous purification and accurate silver replenishment of silver electrolyte.
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