Title:
METHOD FOR EXTRACTING AND RECOVERING GOLD FROM AQUEOUS SOLUTION
Document Type and Number:
WIPO Patent Application WO/2024/000970
Kind Code:
A1
Abstract:
A method for extracting and recovering gold from an aqueous solution, the method comprising the following steps: (1) extracting gold from a water body by means of electric flocculation, wherein by using an electrolytic cell, gold in an aqueous solution is captured by means of a hydroxide of iron, which is generated in situ by means of an electric flocculation reaction, and is reduced in situ into gold nanoparticles; (2) pickling and dissolving the precipitated iron sludge, wherein the obtained precipitate is dissolved in nitric acid, and after a washing treatment, iron flocs dissolve; and (3) separating and recovering gold by means of a nanofiltration membrane system, wherein the pickled solution of the obtained precipitated iron sludge is subjected to an interception treatment by using a nanofiltration membrane, so as to separate the solution and a nanogold elementary substance, and the latter is washed with water to obtain a gold elementary substance. The extraction and recovery method has the characteristics of a high gold extraction efficiency, a low cost, a simple technological process, high stability and being environmentally friendly; in addition, the method can achieve high-grade recovery of a gold elementary substance, and has relatively strong technical guidance and practical engineering application significance for extraction and recovery of gold during various gold smelting and extraction processes.
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Inventors:
LI PENG (CN)
DUAN CHENLONG (CN)
DAI GUOFU (CN)
DUAN CHENLONG (CN)
DAI GUOFU (CN)
Application Number:
PCT/CN2022/128743
Publication Date:
January 04, 2024
Filing Date:
October 31, 2022
Export Citation:
Assignee:
UNIV CHINA MINING (CN)
International Classes:
C22B11/00; C01D1/32; C25B1/50
Foreign References:
| CN114941076A | 2022-08-26 | |||
| CN1342786A | 2002-04-03 | |||
| CN110482808A | 2019-11-22 | |||
| CN109336302A | 2019-02-15 | |||
| JP2001192745A | 2001-07-17 |
Attorney, Agent or Firm:
CHOFN INTELLECTUAL PROPERTY (CN)
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