Electrochemical reduction of pyrite in aqueous NaCl solution

Optimum conditions for pyrite removal from a high-sulfur coal by electrochemical reduction during flotation are determined by orthogonal experiments. The electrochemical reduction process of pure pyrite is examined with XRD, electrochemical and chemical analysis. The results show that the electroche...

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Bibliographic Details
Published in:Fuel (Guildford) 2005, Vol.84 (2), p.235-238
Main Authors: Zhao, Wei, Zhu, Hong, Zong, Zhi-Min, Xia, Jian-Hua, Wei, Xian-Yong
Format: Article
Language:English
Subjects:
Applied sciences
Coal
Desulfurization
Electrochemical reduction
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fuels
Kinetics
Pyrite
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Summary:Optimum conditions for pyrite removal from a high-sulfur coal by electrochemical reduction during flotation are determined by orthogonal experiments. The electrochemical reduction process of pure pyrite is examined with XRD, electrochemical and chemical analysis. The results show that the electrochemical reduction products of pyrite are FeS and S 2−. During this process, the reactions at cathode are: FeS 2+2e→FeS+S 2− and 2H ++2e→H 2. The corresponding electrode potentials and kinetic equation are determined. The conversion of hydrophobic pyrite to hydrophilic FeS and S 2− by electrochemical reduction is beneficial to desulfurization from coal in floatation process.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2004.08.015