Decomposition mechanism of chromite in sulfuric acid-dichromic acid solution

Qing Zhao; Cheng-jun Liu; Bao-kuan Li; Mao-fa Jiang

doi:10.1007/s12613-017-1528-9

Volume 24 Issue 12

Dec. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 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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Research Article

Decomposition mechanism of chromite in sulfuric acid-dichromic acid solution

+ Author Affiliations

Corresponding author:
Qing Zhao E-mail: zhaoq@smm.neu.edu.cn
Received: 19 May 2017; Revised: 5 July 2017; Accepted: 7 July 2017

Abstract

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.
- hydrometallurgy;
- chromite;
- sulfuric acid leaching;
- spinel;
- decomposition mechanism

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