铜、金和铀在氯化物溶液中的联合浸出。I. 黄铜矿

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2024-10-04 DOI:10.1016/j.hydromet.2024.106406

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引用次数: 0

摘要

在一项旨在从矿石中同时堆浸铜（主要是黄铜矿）、金和铀的研究（第二部分）中，发现可以使用氯酸盐作为氯化物溶液中的氧化剂。因此，在典型的堆浸条件下，对纯黄铜矿电极进行了电化学和批量浸出试验，进行了更详细的研究。使用中等低浓度的氯酸盐表明，在酸性氯化物溶液中，黄铜矿的溶解速率可以在环境温度下保持 4 天。酸浓度越高，溶解速度越快。观察到的溶解速率明显高于电化学和混合电位模型预测的氧化溶解速率。对氯酸盐与氯离子反应产生的低浓度氯氧化亚硫化氢和铁（III）的动力学进行了初步测定。这些反应速度很快，理论表明它们支持所提出的非氧化机制。

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The combined leaching of copper, gold and uranium in chloride solutions. I. Chalcopyrite

In a study (Part II) aimed at the simultaneous heap leaching of copper (predominantly chalcopyrite), gold and uranium from an ore, it was found that this could be achieved using chlorate as the oxidant in chloride solutions. As a result, a more detailed study has been made using electrochemical and batch leach tests on pure chalcopyrite electrodes under typical heap leach conditions.

The use of chlorate at moderately low concentrations has shown that enhanced rates of dissolution of chalcopyrite can be maintained over periods up to 4 days at ambient temperatures in acidic chloride solutions. The rate of dissolution is enhanced at higher acid concentrations. The rate in the presence of chlorate does not appear to depend on the iron(III) (and presumably the copper(II)) concentration.

The observed rates are significantly greater than those predicted for oxidative dissolution from the electrochemistry and the mixed potential model. An alternative non-oxidative mechanism has been revisited to account for this difference.

A preliminary measurement has been made of the kinetics of the oxidation of hydrogen sufide and iron(III) by low concentrations of chlorine produced by reaction of chlorate with chloride ions. These reactions are rapid, and theory shows that they would support the proposed non-oxidative mechanism.

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来源期刊

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

期刊介绍： Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties. Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.