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Volume 24 Issue 9
Sep.  2017
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文章导航 >  矿物冶金与材料学报（英文）  > 2017  >  24(9): 983-990
Pei-yang Shi, Cheng-jun Liu, Qing Zhao, and Hao-nan Shi, Study on mechanisms of different sulfuric acid leaching technologies of chromite, Int. J. Miner. Metall. Mater., 24(2017), No. 9, pp. 983-990. https://doi.org/10.1007/s12613-017-1486-2
Cite this article as:
Pei-yang Shi, Cheng-jun Liu, Qing Zhao, and Hao-nan Shi, Study on mechanisms of different sulfuric acid leaching technologies of chromite, Int. J. Miner. Metall. Mater., 24(2017), No. 9, pp. 983-990. https://doi.org/10.1007/s12613-017-1486-2
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研究论文

Study on mechanisms of different sulfuric acid leaching technologies of chromite

  • Key Laboratory for Ecological Metallurgy of Multimetallic Ores, Northeastern University, Shenyang 110819, China

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

  • Faculty of Chemical, Environmental, and Biological Science and Technology, Dalian University of Technology, Dalian 116024, China

  • 通讯作者:

    Pei-yang Shi    E-mail: shipy@smm.neu.edu.cn

  • The extraction of chromate from chromite via the sulfuric acid leaching process has strong potential for practical use because it is a simple and environmentally friendly process. This paper aims to study the sulfuric acid leaching process using chromite as a raw material via either microwave irradiation or in the presence of an oxidizing agent. The results show that the main phases in Pakistan chromite are ferrichromspinel, chrompicotite, hortonolite, and silicate embedded around the spinel phases. Compared with the process with an oxidizing agent, the process involving microwaves has a higher leaching efficiency. When the mass fraction of sulfuric acid was 80% and the leaching time was 20 min, the efficiency could exceed 85%. In addition, the mechanisms of these two technologies fundamentally differ. When the leaching was processed in the presence of an oxidizing agent, the silicate was leached first and then expanded. By contrast, in the case of leaching under microwave irradiation, the chromite was dissolved layer by layer and numerous cracks appeared at the particle surface because of thermal shock. In addition, the silicate phase shrunk instead of expanding.
    • Research Article

    Study on mechanisms of different sulfuric acid leaching technologies of chromite

    + Author Affiliations
      Abstract
    • The extraction of chromate from chromite via the sulfuric acid leaching process has strong potential for practical use because it is a simple and environmentally friendly process. This paper aims to study the sulfuric acid leaching process using chromite as a raw material via either microwave irradiation or in the presence of an oxidizing agent. The results show that the main phases in Pakistan chromite are ferrichromspinel, chrompicotite, hortonolite, and silicate embedded around the spinel phases. Compared with the process with an oxidizing agent, the process involving microwaves has a higher leaching efficiency. When the mass fraction of sulfuric acid was 80% and the leaching time was 20 min, the efficiency could exceed 85%. In addition, the mechanisms of these two technologies fundamentally differ. When the leaching was processed in the presence of an oxidizing agent, the silicate was leached first and then expanded. By contrast, in the case of leaching under microwave irradiation, the chromite was dissolved layer by layer and numerous cracks appeared at the particle surface because of thermal shock. In addition, the silicate phase shrunk instead of expanding.
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