Dissolution of gold in the presence of copper ion and diethylenetriamine (DETA)

IF 0.9 Q3 MINING & MINERAL PROCESSING

Mineral Processing and Extractive Metallurgy-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2023-08-28 DOI:10.1080/25726641.2023.2249703

E. A. Agorhom, C. Owusu, Lilian Gyedu

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Abstract

ABSTRACT Cyanidation is the most widely used technique for gold extraction worldwide. However, its efficiency in gold extraction has decreased due to gold association with base metals such as copper. Copper is known to form different complexes with cyanide depending on the pulp pH. These Cu-CN complexes deplete the pulp of free cyanide, thereby decreasing gold leaching. The study examined the application of diethylenetriamine (DETA) in cyanidation to minimise copper ions effect on gold cyanidation. Leaching tests performed in the presence of copper ions reduced gold recovery from 93% to 15% at a copper sulphate concentration of 1% and increased cyanide consumption by 10%. The introduction of DETA (between 0.2% and 1%) however restored gold recovery back to normal as the baseline without copper ions and also enabled gold extraction at a reduced cyanide strength. Based on the study, DETA could be used during gold–copper cyanide leaching to minimise the copper ion effect and enhance gold extraction.

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铜离子和二乙烯三胺(DETA)存在下金的溶解

氰化是世界上应用最广泛的黄金提取技术。然而，由于金与铜等贱金属的结合，其金提取效率降低。已知铜与氰化物形成不同的络合物，这取决于矿浆的pH。这些Cu-CN络合物耗尽了矿浆中的游离氰化物，从而减少了金的浸出。本研究考察了二亚乙基三胺（DETA）在氰化中的应用，以最大限度地减少铜离子对金氰化的影响。在铜离子存在下进行的浸出试验将硫酸铜浓度为1%时的金回收率从93%降低到15%，氰化物消耗增加了10%。然而，DETA（在0.2%和1%之间）的引入使金回收率恢复到正常，作为没有铜离子的基线，并且还能够以降低的氰化物强度提取金。根据这项研究，DETA可用于金-铜氰化浸出，以最大限度地减少铜离子的影响并提高金的提取率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Mineral Processing and Extractive Metallurgy-Transactions of the Institutions of Mining and Metallurgy MINING & MINERAL PROCESSING-

CiteScore

3.50

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0.00%

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