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How Ferric Salt Enhances the First-Stage Acidic Leaching of Chalcocite: Performance of Intermediate Crystallite

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Abstract

Being the main intermediate species, the performance of digenite (Cu1.8S) and covellite (CuS) crystallite in the leaching process of chalcocite remains unclear. This article investigated chalcocite leaching with varying Fe3+ concentrations. Through characterizing solutions and solid residues by SRXRD (synchrotron radiation x-ray diffraction) and SEM-EDS (scanning electron microscope-energy dispersive spectrometer), the results showed that adding Fe3+ can significantly affect the crystallite status of digenite. Based on unit cell information from SRXRD, at 0.1M Fe3+, the calculated digenite crystallite size was only 8.01 nm while its crystallite size was significantly larger without Fe3+ with the value of 50.84 nm. In addition, SEM images also showed the smaller particle size of digenite with poor crystallite with Fe3+. This report may provide a further performance of intermediate crystallite that how ferric salt and higher solution potential enhance the first-stage acidic leaching of chalcocite.

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Acknowledgements

This research was funded by the National Natural Science Foundation of China (52004086, U1932129, 51774332, 51904096 and 51964024), Natural Science Foundation of Hunan Province (2018JJ1041), The Key Project of Science and Technology of Henan Province (202102310543), Key Research Project of Colleges and Universities in Henan Province (21A440007) and Natural Science Foundation of Henan Polytechnic University (B2020-27). Authors acknowledge the staff and professors of the Beijing Synchrotron Radiation Facility (BSRF) and Shanghai Synchrotron Radiation Facility (SSRF) for their help in beamline operation, data collection and direction. We acknowledge the facilities of the Australian Microscopy & Microanalysis Research Facility at the Centre for Microscopy and Microanalysis, the University of Queensland.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454000, China

    Chaojun Fang, Tianrui Cai & Lijuan Gao

  2. School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China

    Chaojun Fang, Shichao Yu, Guanzhou Qiu & Jun Wang

  3. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming, 650093, China

    Chaojun Fang & Lingyun Huang

  4. Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo, 454000, China

    Chaojun Fang

  5. School of Chemical Engineering, the University of Queensland, Brisbane, QLD, 4072, Australia

    Hong Peng

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  1. Chaojun Fang
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Fang, C., Cai, T., Yu, S. et al. How Ferric Salt Enhances the First-Stage Acidic Leaching of Chalcocite: Performance of Intermediate Crystallite. JOM 74, 1969–1977 (2022). https://doi.org/10.1007/s11837-022-05171-w

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  • DOI: https://doi.org/10.1007/s11837-022-05171-w

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