DISSOLUTION KINETICS OF A COPPER OXIDE ORE SAMPLE AND OPTIMIZING THE EFFECTIVE PARAMETERS, USING RESPONSE SURFACE METHODOLOGY

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-01-01 DOI:10.17794/rgn.2023.2.5

H. Maleki, Sajjad Chehreghani, M. Noaparast, M. Mirmohammadi, Minoo Ghanbarzad

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Abstract

In this research work, the leaching behavior of a copper oxide ore sample prepared from the Qaleh-Zari copper mine with a very high grade of 5.4% Cu (malachite and azurite) was investigated to evaluate the effects of significant operating parameters on copper recovery, including sulfuric acid concentration, solid percentage, particle size and agitation speed. Then, response surface methodology (RSM) and central composite design (CCD) were employed to optimize the leaching process and assess interactions between the effective parameters. In order to further analyze the leaching behavior, kinetics of copper dissolution was studied on the basis of the shrinking core models (SCM). The results showed a reduction in the rate of recovery with an increase in the solid percentage and/or particle size. In contrast, any increase in the agitation speed and/or acid concentration was found to improve the recovery. It was remarkable that increasing the sulfuric acid content, beyond a certain level, imposed no significant effect on the recovery. Optimal copper recovery was obtained with a solid percentage, agitation speed, particle size, and sulfuric acid concentration of 25.12%, 586 rpm, 70 μm, and 12.5%, respectively, leading to a recovery of 93.24%. A study on the leaching kinetics indicated that the dissolution rate was controlled by the fluid diffusion from product layer model with 30.71 kJ/mol of activation energy.

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用响应面法优化氧化铜矿石样品的溶解动力学及有效参数

本研究以Qaleh-Zari铜矿为研究对象，对铜品位为5.4%(孔雀石和蓝铜矿)的氧化铜矿石样品的浸出行为进行了研究，评价了硫酸浓度、固含量、粒度和搅拌速度等重要操作参数对铜回收率的影响。然后，采用响应面法(RSM)和中心复合设计(CCD)对浸出过程进行了优化，并评估了有效参数之间的相互作用。为了进一步分析浸出行为，基于缩核模型对铜的溶解动力学进行了研究。结果表明，随着固含量和/或粒径的增加，回收率降低。相比之下，发现任何增加搅拌速度和/或酸浓度都能提高回收率。值得注意的是，增加硫酸含量，超过一定水平，对回收率没有显著影响。当固含量为25.12%、搅拌转速为586 rpm、粒径为70 μm、硫酸浓度为12.5%时，铜的最佳回收率为93.24%。浸出动力学研究表明，溶出速率受产物层模型流体扩散控制，活化能为30.71 kJ/mol。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.