A novel electrochemical process for desulfurization in the CaO-SiO2-Al2O3 system

Sang Hoon Lee, Dong Joon Min

Research output: Contribution to journalArticle

Abstract

The effect of electric potential on the sulfide capacity of the CaO-SiO2-Al2O3 system was evaluated by applying voltages in the range of -1.5 to 1.5 V at 1823 K in a C/CO gas equilibrium. When the cathodic potential (-1.5 to 0 V) was applied, it was confirmed that the sulfur partition ratio increased based on the electrochemical reaction of sulfur (S + 2e- = S2-). However, the reversibility of the electrochemical resulfurization reaction (S2- = S + 2e-) in slag was not established in the reverse (anodic) potential region (0-1.5 V), yet the sulfur partition ratio increased. In particular, sulfur evaporation was observed in the anodic potential region. Therefore, in the present study, potential anodic electro-desulfurization mechanisms based on sulfur evaporation are proposed. To verify these mechanisms, sulfur evaporation is discussed in detail as a function of the thermodynamic stability of sulfur in the slag.

Original languageEnglish
Article number2478
JournalMaterials
Volume13
Issue number11
DOIs
Publication statusPublished - 2020 Jun 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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