Gold Extraction from Oxide Ore using Copper Ethylenediamine Thiosulfate

IF 1.8 3区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Russian Journal of Inorganic Chemistry Pub Date : 2024-08-13 DOI:10.1134/s0036023624601314

Xinyue Xiang, Guohua Ye, Siqin Zhu, Yiyang Rong, Pengzhi Xiang

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Abstract

Thiosulfate leaching is considered a green gold extraction approach and a gold mine in Laos was subjected to such treatment in this study. A single factor test was undertaken to determine the optimal leaching conditions, leading to the following parameters: thiosulfate concentration of 0.2 mol L^–1; copper ion concentration of 0.005 mol L^–1; ethylenediamine concentration of 0.01 mol L^–1; pH value of 10; leaching time of 4 h; stirring speed of 200 rpm. After leaching, the remaining ion concentrations were relatively low, positively affecting gold recovery. To further enhance the leaching rate, the impact of cetyltriethylammonium bromide (CTAB) on the leaching rate of gold was investigated, revealing that the addition of CTAB can increase gold’s leaching rate while reducing thiosulfate consumption. In conclusion, a comparison was made between thiosulfate and cyanide leaching, where copper-ethylenediamine-thiosulfate leaching exhibited a shorter duration compared to cyanidation, establishing its potential as a more environmentally sustainable approach.

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利用乙二胺硫代硫酸铜从氧化物矿石中提取黄金

摘要硫代硫酸盐浸出被认为是一种绿色提金方法，本研究对老挝的一个金矿进行了这种处理。为确定最佳浸出条件，进行了单因素试验，得出以下参数：硫代硫酸盐浓度为 0.2 mol L-1；铜离子浓度为 0.005 mol L-1；乙二胺浓度为 0.01 mol L-1；pH 值为 10；浸出时间为 4 小时；搅拌速度为 200 rpm。浸出后，剩余离子浓度相对较低，对金的回收产生了积极影响。为了进一步提高浸出率，研究了十六烷基三乙基溴化铵（CTAB）对金浸出率的影响，结果表明，加入 CTAB 可以提高金的浸出率，同时减少硫代硫酸盐的消耗。最后，对硫代硫酸盐和氰化物浸出法进行了比较，结果表明，与氰化法相比，铜-乙二胺-硫代硫酸盐浸出法的持续时间更短，因此有可能成为一种更具环境可持续性的方法。

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来源期刊

Russian Journal of Inorganic Chemistry 化学-无机化学与核化学

CiteScore

3.10

自引率

38.10%

发文量

237

审稿时长

3 months

期刊介绍： Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.