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Reduction of Sn-Bearing Iron Concentrate with Mixed H2/CO Gas for Preparation of Sn-Enriched Direct Reduced Iron

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Abstract

The development of manufacturing technology of Sn-bearing stainless steel inspires a novel concept for using Sn-bearing complex iron ore via reduction with mixed H2/CO gas to prepare Sn-enriched direct reduced iron (DRI). The thermodynamic analysis of the reduction process confirms the easy reduction of stannic oxide to metallic tin and the rigorous conditions for volatilizing SnO. Although the removal of tin is feasible by reduction of the pellet at 1223 K (950 °C) with mixed gas of 5 vol pct H2, 28.5 vol pct CO, and 66.5 vol pct CO2 (CO/(CO + CO2) = 30 pct), it is necessary that the pellet be further reduced for preparing DRI. In contrast, maintaining Sn in the metallic pellet is demonstrated to be a promising way to effectively use the ore. It is indicated that only 5.5 pct of Sn is volatilized when the pellet is reduced at 1223 K (950 °C) for 30 minutes with the mixed gas of 50 vol pct H2, 50 vol pct CO (CO/(CO + CO2) = 100 pct). A metallic pellet (Sn-bearing DRI) with Sn content of 0.293 pct, Fe metallization of 93.5 pct, and total iron content of 88.2 pct is prepared as a raw material for producing Sn-bearing stainless steel. The reduced tin in the Sn-bearing DRI either combines with metallic iron to form Sn-Fe alloy or it remains intact.

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  1. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

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Acknowledgments

The authors express their thanks to the National Natural Science Foundation of China (Grant No. 51574283) and the Teachers’ Research Fund of Central South University (Grant No. 2013JSJJ028) for financial support of this research. This work was also financially supported by the Co-Innovation Center for Clean and Efficient Utilization of Strategic Metal Mineral Resources.

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Authors and Affiliations

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

    Zhixiong You, Guanghui Li, Peidan Wen, Zhiwei Peng, Yuanbo Zhang & Tao Jiang

  2. Central South University, RM 205, Biology Building, Changsha, 410083, Hunan, China

    Zhixiong You

  3. Central South University, RM 253, Peace Building, Changsha, 410083, Hunan, China

    Guanghui Li

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  1. Zhixiong You
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  2. Guanghui Li
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  3. Peidan Wen
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  4. Zhiwei Peng
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  5. Yuanbo Zhang
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  6. Tao Jiang
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Correspondence to Guanghui Li.

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Manuscript submitted October 6, 2016.

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You, Z., Li, G., Wen, P. et al. Reduction of Sn-Bearing Iron Concentrate with Mixed H2/CO Gas for Preparation of Sn-Enriched Direct Reduced Iron. Metall Mater Trans B 48, 1486–1493 (2017). https://doi.org/10.1007/s11663-017-0939-3

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  • DOI: https://doi.org/10.1007/s11663-017-0939-3

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