Desulfurization of molten steel with molten slag using the electrochemical method

J. Min. Metall. Sect. B-Metall., 58 (2) (2022) 275-284 DOI:10.2298/JMMB211014012W
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Available online 24 June 2022
(Received 14 October 2021; Accepted 16 June 2022)


The desulfurization in metallurgical process is electrochemical reaction in nature. Desulfurization using the electrochemical method was proposed with the CaO-MgO-Al2O3 molten slag covering molten steel. Effect of an applied external DC voltage, varied from 0 to 8V, was discussed. The results indicated that sulfur in molten steel can be removed effectively with applied external voltage. According to the mechanism analyses of the desulfurization under the applied external voltage, kinetics formulae were developed, and the model calculated results accord well with the experimental values. The transfer coefficient of sulfur in molten slag under electromigration conditions is approximately 2.09×10-5 m·s-1·V-1. The desulfurization of molten steel with molten slag can be promoted by increasing the applied voltage, reducing the partial pressure of atmospheric oxygen, strengthening the stirring intensity of the reaction system, and optimizing the composition and properties of the slag.

Keywords: Desulfurization; Electrochemical; Kinetic; Electromigration; Mass transfer coefficient
Correspondence Address:
J.-F. Xu,
a School of Iron and Steel, Soochow University, Suzhou, Jiangsu. China;
b Shanghai Key Laboratory of Modern Metallurgy and Material Processing,
Shanghai University, Shanghai, China;,
email: This email address is being protected from spambots. You need JavaScript enabled to view it.



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