A novel method to extract vanadium and chromium from vanadium slag using molten NaOH-NaNO3 binary system

Authors

  • Biao Liu,

    1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
    2. Graduate University of the Chinese Academy of Sciences, Beijing, China
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  • Hao Du,

    1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
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  • Shao-Na Wang,

    1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
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  • Yi Zhang,

    1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
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  • Shi-Li Zheng,

    Corresponding author
    • National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
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  • Lan-Jie Li,

    1. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China
    2. Research Center of Vanadium and Titanium Technology, Chengde Iron and Steel Group Co., Ltd., Hebei Iron and Steel Group Co., Ltd., Hebei, China
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  • Dong-Hui Chen

    1. Research Center of Vanadium and Titanium Technology, Chengde Iron and Steel Group Co., Ltd., Hebei Iron and Steel Group Co., Ltd., Hebei, China
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Correspondence concerning this article should be addressed to S.-L. Zheng at slzheng@home.ipe.ac.cn.

Abstract

A new method using NaOH-NaNO3 binary melts to treat vanadium slag is proposed. Vanadium and chromium can be simultaneously extracted in the leaching processes. Under the optimum reaction conditions, the recovery of vanadium and chromium can reach 93.7% and 88.2% in 6 h, respectively. The kinetics investigation indicates that the decomposition of vanadium slag is controlled by mass transfer in product layer. During the reaction, NaOH is believed to provide basic media and facilitate the dissolution of acidic oxides. NaNO3 decomposes to produce a large amount of active oxygen species, such as O, math formula, and O2−. NaOH intensifies the decomposition of NaNO3 to NaNO2, but inhibits further decomposition of NaNO2. NaNO3 can be regenerated by oxidation of NaNO2 using oxygen at high temperature. The apparent activation energy of NaNO2 oxidation in the temperature ranging from 350 to 450°C is 105.5 kJ/mol. © 2012 American Institute of Chemical Engineers AIChE J, 59: 541–552, 2013

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