Method for recovering precious metal from extracted organic phase

By using a thiourea-thiocyanate (TU-SCN-) synergistic complexing back-extraction system, precious metals can be efficiently recovered from the extracted organic phase, solving the problems of low efficiency and high cost of single back-extraction agents in existing technologies, and achieving high recovery rate and low cost of precious metal recovery.

CN121204418APending Publication Date: 2025-12-26CENT SOUTH UNIV
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Patent Information

Application Number
CN202511367380.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-24
Publication Date
2025-12-26

AI Technical Summary

Technical Problem

In the prior art, when thiourea or thiocyanate is used as a single back-extraction agent, the single back-extraction rate is low, the concentration used is high, the number of back-extraction stages is large, and the cost is high. Moreover, the relevant patents do not make full use of them as back-extraction agents for precious metal recovery.

Method used

A thiourea-thiocyanate (TU-SCN-) synergistic complexation back-extraction system was used to recover precious metals from the extracting organic phase. By preparing a solution of thiourea and thiocyanate at a certain molar ratio with a specific concentration and pH, and mixing it with the extracting organic phase for multi-stage back-extraction, the back-extraction efficiency was improved.

Benefits of technology

It achieves a high precious metal recovery rate (>99%), reduces costs, decreases the number of back-extraction stages and concentration, and improves back-extraction efficiency.

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Abstract

The invention discloses a method for recovering precious metals from an extracted organic phase. According to the method for recycling the precious metal from the extracted organic phase, thiourea-thiocyanate (TU-SCN-) is adopted to cooperate with a complexing back-extraction agent A to conduct multi-stage back-extraction on the extracted organic phase O, and metal recycling in the extracted organic phase is achieved. According to the method for recovering the precious metal from the extracted organic phase, a thiourea-thiocyanate (TU-SCN-) synergistic complexing back extraction system is adopted for recovering the metal from the extracted organic phase, the back extraction efficiency is high, and the metal recovery rate is high (gt; and precious metals such as gold and silver can be recovered from an organic phase at a relatively low cost.
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Citation Information

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