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Volume 24 Issue 12
Dec.  2017
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文章导航 >  矿物冶金与材料学报（英文）  > 2017  >  24(12): 1361-1369
Qing Zhao, Cheng-jun Liu, Bao-kuan Li, and Mao-fa Jiang, Decomposition mechanism of chromite in sulfuric acid-dichromic acid solution, Int. J. Miner. Metall. Mater., 24(2017), No. 12, pp. 1361-1369. https://doi.org/10.1007/s12613-017-1528-9
Cite this article as:
Qing Zhao, Cheng-jun Liu, Bao-kuan Li, and Mao-fa Jiang, Decomposition mechanism of chromite in sulfuric acid-dichromic acid solution, Int. J. Miner. Metall. Mater., 24(2017), No. 12, pp. 1361-1369. https://doi.org/10.1007/s12613-017-1528-9
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研究论文

Decomposition mechanism of chromite in sulfuric acid-dichromic acid solution

  • Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University, Shenyang 110819, China

  • School of Metallurgy, Northeastern University, Shenyang 110819, China

  • 通讯作者:

    Qing Zhao    E-mail: zhaoq@smm.neu.edu.cn

  • The sulfuric acid leaching process is regarded as a promising, cleaner method to prepare trivalent chromium products from chromite; however, the decomposition mechanism of the ore is poorly understood. In this work, binary spinels of Mg-Al, Mg-Fe, and Mg-Cr in the powdered and lump states were synthesized and used as raw materials to investigate the decomposition mechanism of chromite in sulfuric acid-dichromic acid solution. The leaching yields of metallic elements and the changes in morphology of the spinel were studied. The experimental results showed that the three spinels were stable in sulfuric acid solution and that dichromic acid had little influence on the decomposition behavior of the Mg-Al spinel and Mg-Fe spinel because Mg2+, Al3+, and Fe3+ in spinels cannot be oxidized by Cr6+. However, in the case of the Mg-Cr spinel, dichromic acid substantially promoted the decomposition efficiency and functioned as a catalyst. The decomposition mechanism of chromite in sulfuric acid-dichromic acid solution was illustrated on the basis of the findings of this study.
    • Research Article

    Decomposition mechanism of chromite in sulfuric acid-dichromic acid solution

    + Author Affiliations
      Abstract
    • The sulfuric acid leaching process is regarded as a promising, cleaner method to prepare trivalent chromium products from chromite; however, the decomposition mechanism of the ore is poorly understood. In this work, binary spinels of Mg-Al, Mg-Fe, and Mg-Cr in the powdered and lump states were synthesized and used as raw materials to investigate the decomposition mechanism of chromite in sulfuric acid-dichromic acid solution. The leaching yields of metallic elements and the changes in morphology of the spinel were studied. The experimental results showed that the three spinels were stable in sulfuric acid solution and that dichromic acid had little influence on the decomposition behavior of the Mg-Al spinel and Mg-Fe spinel because Mg2+, Al3+, and Fe3+ in spinels cannot be oxidized by Cr6+. However, in the case of the Mg-Cr spinel, dichromic acid substantially promoted the decomposition efficiency and functioned as a catalyst. The decomposition mechanism of chromite in sulfuric acid-dichromic acid solution was illustrated on the basis of the findings of this study.
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