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Leaching of Chalcopyrite Concentrate with Hydrogen Peroxide and Sulfuric Acid in an Autoclave System

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Abstract

In this study, leaching of chalcopyrite concentrate was investigated in an autoclave system using hydrogen peroxide and sulfuric acid. By decomposition of hydrogen peroxide, the active oxygen formed can provide both high oxidation potential and high pressure in a closed vessel for leaching. Preliminary studies showed that hydrogen peroxide can be used as an oxidant instead of oxygen gas in the autoclave. Central composite design (CCD) was used to examine the effects of the experimental parameters on the copper and iron extraction as a response. The proposed model equation using CCD showed good agreement with experimental data, the correlation coefficients R 2 for copper and iron being 0.84 and 0.86, respectively. The optimum conditions to obtain the main goal of maximum copper and minimum iron extraction from chalcopyrite were determined as to be sulfuric acid concentration of 2.5 M, hydrogen peroxide concentration of 2.3 M, leaching time of 24 minutes, chalcopyrite amount of 3.17 g (in 50-mL solution), stirring speed of 630 rpm, and leaching temperature of 351 K (78 °C). Under the optimum condition, 76 pct of copper and 9 pct of iron were extracted from chalcopyrite concentrate. Extraction yield results of metals indicate that selective leaching of chalcopyrite can be achieved using hydrogen peroxide and sulfuric acid in an autoclave system.

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Acknowledgments

This study was supported by the TUBITAK (Scientific and Technological Research Council of Turkey) under the Project No: 106M177. The authors wish to express their thanks to chemical engineer Hasan Arslanoğlu for his help in conducting the experiments. The authors are also thankful to Prof. Dr. Murat Erdemoğlu and mining engineer Hakan Derin for help in the SEM analysis.

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Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Fırat University, 23119, Elazığ, Turkey

    M. Deniz Turan (Assistant Professor)

  2. Department of Bioengineering, Fırat University, 23119, Elazığ, Turkey

    H. Soner Altundoğan (Professor)

Authors
  1. M. Deniz Turan
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  2. H. Soner Altundoğan
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Correspondence to M. Deniz Turan.

Additional information

Manuscript submitted July 27, 2012.

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Turan, M.D., Altundoğan, H.S. Leaching of Chalcopyrite Concentrate with Hydrogen Peroxide and Sulfuric Acid in an Autoclave System. Metall Mater Trans B 44, 809–819 (2013). https://doi.org/10.1007/s11663-013-9858-0

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