Study on mechanisms of different sulfuric acid leaching technologies of chromite

Pei-yang Shi; Cheng-jun Liu; Qing Zhao; Hao-nan Shi

doi:10.1007/s12613-017-1486-2

Volume 24 Issue 9

Sep. 2017

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

Study on mechanisms of different sulfuric acid leaching technologies of chromite

+ Author Affiliations

Corresponding author:
Pei-yang Shi E-mail: shipy@smm.neu.edu.cn
Received: 11 December 2016; Revised: 21 March 2017; Accepted: 23 March 2017

Abstract

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.
- chromite;
- leaching mechanisms;
- microwave leaching;
- sulfuric acid;
- microanalysis

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References

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