Investigation of the effect of some polar organic solvents on the leaching and dissolution kinetics of chalcopyrite in hydrogen peroxide and sulfuric acid solution

IF 1.3 4区化学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Bulletin of the Chemical Society of Ethiopia Pub Date : 2023-03-06 DOI:10.4314/bcse.v37i3.19

Mohamed Taha Osman Abdelraheem, T. Agacayak

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引用次数: 2

Abstract

ABSTRACT. The effect of acetic acid and ethanol as polar aqueous solvents on sulfuric acid with hydrogen peroxide as an oxidant was studied. A small amount of these polar aqueous solvents significantly improved the copper leaching recovery. The leaching parameters such as temperature, stirring speed, H2O2 concentration, solid/liquid ratio, H2SO4 concentration and particle size were examined. About 76.33% as highest Cu extraction was gained with 2 M H2O2, 600 rpm stirring speed, 50 °C temperature, 1 M H2SO4, 240 min of the reaction and 75 x 53 µm particle size fraction. Further experimental tests were carried out when the stirring speed, solid-to-liquid ratio (S/L), particle size, H2O2 concentration, temperature and H2SO4 concentration were kept constant to investigate the effect of ethanol and acetic acid concentration in the range of 0–2 M. The experimental results proved that the copper extraction recovery reached to 99.03% in 180 min of the reaction with 2 M acetic acid. While 2 M of ethanol increased copper extraction recovery up to 100% in 90 min of the leaching time. The dissolution reaction found to be described by mixed kinetic model and activation energy of 54.37 kJ/mol. Addition of acetic acid and ethanol suggested reaction controlled by diffusion across product layer. KEY WORDS: Hydrogen peroxide, Sulfuric acid, Activation energy, Leaching, Chalcopyrite Bull. Chem. Soc. Ethiop. 2023, 37(3), 779-788. DOI: https://dx.doi.org/10.4314/bcse.v37i3.19

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几种极性有机溶剂对黄铜矿在过氧化氢和硫酸溶液中浸出和溶解动力学影响的研究

摘要。研究了乙酸和乙醇作为极性水性溶剂对过氧化氢氧化硫酸的影响。少量的这些极性水性溶剂显著提高了铜的浸出回收率。考察了温度、搅拌速度、H2O2浓度、固液比、H2SO4浓度和粒度等浸出参数。在2 M H2O2、600 rpm搅拌速度、50°C温度、1 M H2SO4、240分钟反应和75 x 53µM粒径分数的条件下，获得了约76.33%的最高铜提取率。当搅拌速度、固液比（S/L）、粒度、H2O2浓度、温度和H2SO4浓度保持不变时，进行了进一步的实验测试，以研究乙醇和乙酸浓度在0–2M范围内的影响。实验结果表明，与2M乙酸反应180分钟，铜萃取回收率达到99.03%。而2M的乙醇在90分钟的浸出时间内将铜提取回收率提高到100%。溶解反应用混合动力学模型描述，活化能为54.37kJ/mol。乙酸和乙醇的加入表明反应通过产物层的扩散来控制。关键词：过氧化氢，硫酸，活化能，浸出，黄铜矿。化学。Soc.Ethiop。2023，37（3），779-788。DOI：https://dx.doi.org/10.4314/bcse.v37i3.19

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来源期刊

Bulletin of the Chemical Society of Ethiopia 化学-化学综合

CiteScore

2.20

自引率

8.30%

发文量

113

审稿时长

6-12 weeks

期刊介绍： The Bulletin of the Chemical Society of Ethiopia (BCSE) is a triannual publication of the Chemical Society of Ethiopia. The BCSE is an open access and peer reviewed journal. The BCSE invites contributions in any field of basic and applied chemistry.