Leaching of Gold with Thiosulfate-EDTA-Copper Ion System

被引：0
|
作者：
Xiang P. [1 ,2 ]
Liu L. [2 ,3 ]
Hang Y. [2 ,3 ]
Ye G. [1 ]
机构：
[1] Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming
[2] School of Chemical Engineering, Yunnan Open University, Kunming
[3] Yunnan Vocational College of National-Defense Technology, Kunming
来源：
Xiyou Jinshu/Chinese Journal of Rare Metals | 2020年 / 44卷 / 05期
关键词：
Ethylenediaminetetraacetic acid (EDTA); Gold ore; Leaching; Thiosulfate;
D O I：
10.13373/j.cnki.cjrm.XY18110003
中图分类号：
学科分类号：
摘要：
The leaching of gold with the thiosulfate is a kind of green process. The thiosulfate-ethylenediaminetetraacetic acid (EDTA)-copper ion leaching system was constructed using EDTA instead of ammonia. Firstly, it was shown that the corrosion potential of gold in this system was low and corrosion current was larg by the analysis of Tafel curve, which had potential application. Then, the properties of gold ore sample were analyzed. The results showed that the mineral composition was relatively simple, mainly quartz and dolomite. The ore sample did not contain other components except gold and silver. It was a silver gold mine with a high gold content and its gold grade was as high as 3.10 g•t-1, Finally, under normal temperature and pressure, leaching gold from a gold ore in Laos was studied using this system, and the influence of various factors on gold leaching was examined. The results showed that the leaching rate of gold reached 83.76% under the conditions of 0.3 mol•L-1 of S2O32-, 0.03 mol•L-1 of Cu2+, 0.05 mol•L-1 of EDTA, 4: 1 of liquid-solid ratio, 10.0 of pH and 300 r•min-1 of agitation speed which was satisfactory. The actual leaching rate of gold mine was performed with thiosulfate-EDTA-copper ion leaching system, but the leaching time was longer. How to shorten the leaching time should be further studied. © Editorial Office of Chinese Journal of Rare Metals. All right reserved.
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页码：555 / 560
页数：5
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