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Efficient Separation and Extraction of Vanadium and Chromium in High Chromium Vanadium Slag by Selective Two-Stage Roasting–Leaching

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Abstract

Vanadium and chromium are important rare metals, leading to a focus on high chromium vanadium slag (HCVS) as a potential raw material to extract vanadium and chromium in China. In this work, a novel method based on selective two-stage roasting–leaching was proposed to separate and extract vanadium and chromium efficiently in HCVS. XRD, FT-IR, and SEM were utilized to analyze the phase evolutions and microstructure during the whole process. Calcification roasting, which can calcify vanadium selectively using thermodynamics, was carried out in the first roasting stage to transfer vanadium into acid-soluble vanadate and leave chromium in the leaching residue as (Fe0.6Cr0.4)2O3 after H2SO4 leaching. When HCVS and CaO were mixed in the molar ratio CaO/V2O3 (n(CaO)/n(V2O3)) of 0.5 to 1.25, around 90 pct vanadium and less than 1 pct chromium were extracted in the first leaching liquid, thus achieving the separation of vanadium and chromium. In the second roasting stage, sodium salt, which combines with chromium easily, was added to the first leaching residue to extract chromium and 95.16 pct chromium was extracted under the optimal conditions. The total vanadium and chromium leaching rates were above 95 pct, achieving the efficient separation and extraction of vanadium and chromium. The established method provides a new technique to separate vanadium and chromium during roasting rather than in the liquid form, which is useful for the comprehensive application of HCVS.

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Acknowledgments

This research was financially supported by the Programs of the National Natural Science Foundation of China (Nos. 51574082 and 51374052), the National Basic Research Program of China (973 Program) (No. 2013CB632603), the Fundamental Funds for the central universities (Nos. 150202001), and the National Natural Science Foundation of China and Yunnan Provincial Government (No. U15022273).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, P.R. China

    Jing Wen, Tao Jiang, Yingzhe Xu, Jiayi Liu & Xiangxin Xue

  2. Liaoning Key Laboratory for Recycling Science of Metallurgical Resources, Shenyang, 110819, Liaoning, P.R. China

    Tao Jiang & Xiangxin Xue

Authors
  1. Jing Wen
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  2. Tao Jiang
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  3. Yingzhe Xu
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  4. Jiayi Liu
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  5. Xiangxin Xue
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Correspondence to Tao Jiang.

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Manuscript submitted September 25, 2017.

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Wen, J., Jiang, T., Xu, Y. et al. Efficient Separation and Extraction of Vanadium and Chromium in High Chromium Vanadium Slag by Selective Two-Stage Roasting–Leaching. Metall Mater Trans B 49, 1471–1481 (2018). https://doi.org/10.1007/s11663-018-1197-8

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  • DOI: https://doi.org/10.1007/s11663-018-1197-8

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