Process for selectively extracting gold by thiosulfate method

By adding a strong alkaline anion exchange resin to the thiosulfate method to adsorb gold and copper, the affinity difference between sulfur and oxygen impurity ions and copper is used to achieve high gold-leakage rate and low-cost gold recovery, simplifying the gold extraction process, and the resin can be recycled.

CN120400545AActive Publication Date: 2025-08-01CENT SOUTH UNIV
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Patent Information

Application Number
CN202510897864.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-01
Publication Date
2025-08-01
Estimated Expiration
2045-07-01

AI Technical Summary

Technical Problem

During the thiosulfate method, the gold impregnation rate is low, the process is complex and the cost is high, mainly due to the interference of sulfur and oxygen impurities ion passivation and high concentration of copper on gold recovery.

Method used

During the leaching process, strong alkaline anion exchange resin was added to adsorb gold and copper. Using the difference in affinity between sulfur and oxygen impurity ions and copper, the gold was desorbed by a mixed solution of chloride and sulfite, and the gold was recovered by reducing and recovering the disulfite.

Benefits of technology

The gold leaching rate is improved, the recycling process is simplified, the cost is reduced, and the gold recycling and leaching is achieved. The resin can be recycled, and the desorbent is used at a low cost and low cost.

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Abstract

The invention discloses a selective gold extraction process by a thiosulfate method, which comprises the following steps of: adding gold ore and anion exchange resin into an aqueous solution of a leaching agent, and stirring and leaching to obtain ore pulp containing gold-loaded resin; the leaching agent comprises thiosulfate, copper salt and ammonia water; separating the gold-loaded resin from the ore pulp, and desorbing the gold-loaded resin by adopting a desorption agent to obtain a gold-rich desorption solution; and adding dithionite into the gold-rich desorption solution for reduction to obtain an elemental gold product. According to the process disclosed by the invention, resin adsorption and recovery are synchronously realized during gold leaching, and coadsorption of copper is avoided, so that gold can be enriched by adopting the gold-loaded resin through one-section desorption, and the gold extraction process flow is greatly simplified. In addition, the process is high in gold leaching rate, short in leaching time, low in agent consumption and low in leaching cost. In addition, the resin can be directly and circularly used for gold leaching without regeneration, the reduction barren solution can be circularly used for desorption of the gold-loaded resin by supplementing a small amount of desorption agent, and the recovery cost is low.
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