Electrochemical analysis of copper-EDTA-ammonia-gold thiosulfate dissolution system

被引：0
|
作者：
Xiang, Peng-Zhi [1 ,2 ,3 ]
Ye, Guo-Hua [1 ]
机构：
[1] Kunming Univ Sci & Technol, Fac Land Resource Engn, Kunming 650093, Peoples R China
[2] Yunnan Open Univ, Sch Chem Engn, Kunming 650093, Peoples R China
[3] Yunnan Natl Def Ind Vocat & Tech Coll, Kunming 650023, Peoples R China
来源：
GREEN PROCESSING AND SYNTHESIS | 2023年 / 12卷 / 01期
关键词：
thiosulfate; gold leaching; electrochemical analysis; ligand; OXIDATION;
D O I：
10.1515/gps-2023-0110
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Ethylenediaminetetraacetic acid disodium (EDTA) can form stable complexes with many metals. To improve the leaching rate of gold and the consumption rate of thiosulfate, EDTA and ammonia were combined with copper ions to form a copper-EDTA-ammonia-thiosulfate system. Electrochemical methods were used to study the effect of thiosulfate, copper ion, EDTA, and polarization voltage. The results showed that increasing the concentrations of thiosulfate, copper ions, and EDTA promoted the dissolution of gold, which changed from electrochemical control to diffusion control after adding EDTA. The order of influence was thiosulfate > EDTA > copper ion. The pure gold leaching experiment showed that the dissolution rate of gold in the EDTA-ammonium-copper thiosulfate system was higher than that in the EDTA-copper-thiosulfuric acid system, thus achieving synergistic gold leaching.
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页数：9
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