A novel process for Fe recovery and Zn, Pb removal from a low-grade pyrite cinder with high Zn and Pb contents

Cong-cong Yang; De-qing Zhu; Jian Pan; Si-wei Li; Hong-yu Tian

doi:10.1007/s12613-018-1648-x

Volume 25 Issue 9

Sep. 2018

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International Journal of Minerals, Metallurgy and Materials > 2018 > 25(9): 981-989. > DOI: 10.1007/s12613-018-1648-x

Cong-cong Yang, De-qing Zhu, Jian Pan, Si-wei Li, and Hong-yu Tian, A novel process for Fe recovery and Zn, Pb removal from a low-grade pyrite cinder with high Zn and Pb contents, Int. J. Miner. Metall. Mater., 25(2018), No. 9, pp.981-989. https://dx.doi.org/10.1007/s12613-018-1648-x

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Research Article

A novel process for Fe recovery and Zn, Pb removal from a low-grade pyrite cinder with high Zn and Pb contents

Author Affilications

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

Funds:

This work was financially supported by the National Natural Science Foundation of China (No. 51574281), the National Torch Program of China (No. 2011GH561685).

Received: 11 January 2018; Revised: 27 March 2018; Accepted: 01 April 2018;

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Abstract

Abstract

Comprehensive utilization of pyrite cinders is increasingly important because of their huge annual outputs and potential valuable metals recovery to cope with the gradual depletion of high-grade mineral resources. In this work, a new process, i.e., a high-temperature chlorination-magnetizing roasting-magnetic separation process, was proposed for recovering Fe and removing Zn, Pb from a low-grade pyrite cinder containing 49.90wt% Fe, 1.23wt% Zn, and 0.29wt% Pb. Various parameters, including the chlorinating conditions (dosage of CaCl₂, temperature, and time) and the magnetization roasting conditions (amount of coal, temperature, and time) were investigated. The results indicate that the proposed process is effective for Fe recovery and Zn, Pb removal from the pyrite cinder. Through this process, 97.06% Zn, 96.82% Pb, and approximately 90% S can be removed, and 89.74% Fe is recovered as magnetite into the final product under optimal conditions. A purified magnetite concentrate containing 63.07wt% Fe, 0.16wt% P, 0.26wt% S, and trace amounts of nonferrous metals (0.005wt% Cu, 0.013wt% Pb, and 0.051wt% Zn) was obtained. The concentrate can be potentially used as a high-quality feed material for producing oxidized pellets by blending with other high-grade iron ore concentrates.
- pyrite cinder,
- purification,
- zinc,
- lead,
- high-temperature chlorination,
- magnetizing roasting

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References

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