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Industrial Tests to Modify Molten Copper Slag for Improvement of Copper Recovery

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Abstract

In this article, to improve the recovery of copper from copper slag by flotation process, industrial tests of the modification process involving addition of a composite additive into molten copper slag were conducted, and the modified slag was subjected to the flotation process to confirm the modification effect. The phase evolution of the slag in the modification process was revealed by thermodynamic calculations, x-ray diffraction, optical microscopy and scanning electron microscopy. The results show that more copper was transformed and enriched in copper sulfide phases. The magnetite content in the modified slag decreased, and that of “FeO” increased correspondingly, leading to a better fluidity of the molten slag, which improved the aggregation and growth of fine particles of the copper sulfide minerals. Closed-circuit flotation tests of the original and modified slags were conducted, and the results show that the copper recovery increased obviously from 69.15% to 73.38%, and the copper grade of concentrates was elevated slightly from 20.24% to 21.69%, further confirming that the industrial tests of the modification process were successful. Hence, the modification process has a bright future in industrial applications for enhancing the recovery of copper from the copper slag.

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Acknowledgements

The authors wish to express their thanks to the National Key Technology R&D Program of China (No. 2013BAB03B04) for the financial support of this research and would like to thank the Co-Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources of Hunan Province for supplying the facilities and funds to complete the experiments.

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Authors and Affiliations

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

    Zhengqi Guo, Deqing Zhu, Jian Pan, Feng Zhang & Congcong Yang

Authors
  1. Zhengqi Guo
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  2. Deqing Zhu
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  3. Jian Pan
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  4. Feng Zhang
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  5. Congcong Yang
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Corresponding author

Correspondence to Deqing Zhu.

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Guo, Z., Zhu, D., Pan, J. et al. Industrial Tests to Modify Molten Copper Slag for Improvement of Copper Recovery. JOM 70, 533–538 (2018). https://doi.org/10.1007/s11837-017-2671-5

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  • DOI: https://doi.org/10.1007/s11837-017-2671-5

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