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Recovery of Iron from Pyrite Cinder Containing Non-ferrous Metals Using High-Temperature Chloridizing-Reduction-Magnetic Separation

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Abstract

This study presents a new technique that uses high-temperature chloridizing -reduction-magnetic separation to recover iron from pyrite cinder containing non-ferrous metals. The effects of the reduction temperature, reduction time, and chlorinating agent dosage were investigated. The optimized process parameters were proposed as the following: CaCl2 dosage of 2 pct, chloridizing at 1398 K (1125 °C) for 10 minutes, reducing at 1323 K (1050 °C) for 80 minutes, grinding to a particle size of 78.8 pct less than 45 μm, and magnetic field intensity of 73 mT. Under the optimized conditions, the Cu, Pb, and Zn removal rates were 45.2, 99.2, and 89.1 pct, respectively. The iron content of the magnetic concentrate was 90.6 pct, and the iron recovery rate was 94.8 pct. Furthermore, the reduction behavior and separation mechanism were determined based on microstructure and phase change analyses using X-ray powder diffraction, scanning electron microscope, and optical microscopy.

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Acknowledgments

This project was sponsored by the Basic Research Program of Jiangsu Province (No. BK20140337 and No. BK20130308), and the National Natural Science Foundation of China (No. 51504155 and No. 51574169).

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Authors and Affiliations

  1. School of Iron and Steel, Soochow University, Suzhou, 215021, Jiangsu, P.R. China

    Dong Chen, Hongwei Guo, Jifang Xu, Zemin Xu & Haijiang Huo

  2. Department of Mechanical and Electrical Engineering, Suzhou Institute of Industrial Technology, Suzhou, 215104, Jiangsu, P.R. China

    Yanan Lv

Authors
  1. Dong Chen
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  2. Hongwei Guo
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  3. Jifang Xu
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  4. Yanan Lv
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Correspondence to Dong Chen.

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Manuscript submitted June 5, 2016.

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Chen, D., Guo, H., Xu, J. et al. Recovery of Iron from Pyrite Cinder Containing Non-ferrous Metals Using High-Temperature Chloridizing-Reduction-Magnetic Separation. Metall Mater Trans B 48, 933–942 (2017). https://doi.org/10.1007/s11663-017-0913-0

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