| Decomposition mechanism of chromite in sulfuric acid-dichromic acid solution |
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| 作者姓名： | Qing Zhao Cheng-jun Liu Bao-kuan Li Mao-fa Jiang |
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| 作者单位： | Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education), Northeastern University, Shenyang 110819, China |
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| 基金项目： | This work was financially supported by the National Key R&D Program of China，the Na-tional Natural Science Foundation of China，the China Postdoctoral Science Foundation，the Postdoctoral Foundation of Northeastern University |
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| 摘 要： | 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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| 关 键 词： | hydrometallurgy chromite sulfuric acid leaching spinel decomposition mechanism |
Decomposition mechanism of chromite in sulfuric acid–dichromic acid solution |
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| Qing Zhao,Cheng-jun Liu,Bao-kuan Li,Mao-fa Jiang.Decomposition mechanism of chromite in sulfuric acid-dichromic acid solution[J].International Journal of Minerals,Metallurgy and Materials,2017,24(12):1361-1369. |
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| Authors: | Qing Zhao Cheng-jun Liu Bao-kuan Li Mao-fa Jiang |
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| Institution: | 1. Key Laboratory for Ecological Metalurgy of Multimetalic Ores (Ministry of Education), Northeastern University, Shenyang 110819, China;School of Metalurgy, Northeastern University, Shenyang 110819, China;2. School of Metalurgy, Northeastern University, Shenyang 110819, China |
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| Abstract: | The sulfuric acid leaching process is regarded as a promising, cleaner method to prepare trivalent chromium products from chro-mite; 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 sulfur-ic acid-dichromic acid solution. The leaching yields of metallic elements and the changes in morphology of the spinel were studied. The ex-perimental results showed that the three spinels were stable in sulfuric acid solution and that dichromic acid had little influence on the de-composition 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 de-composition mechanism of chromite in sulfuric acid-dichromic acid solution was illustrated on the basis of the findings of this study. |
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| Keywords: | hydrometallurgy chromite sulfuric acid leaching spinel decomposition mechanism |
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