Prevention of Resulfurization in Desulfurization Process with Magnesium Vapor Produced in Situ by Aluminothermic Reduction of Magnesium Oxide

• YANG Jian

  Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University

• KUWABARA Mamoru

  Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University

• OKUMURA Keiji

  Research Associate, Nagoya University

• SANO Masamichi

  Department of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University

Abstract

The mechanism of resulfurization in the desulfurization process with magnesium vapor produced in situ by aluminothermic reduction of magnesium oxide was clarified in the present work. The influences of various operating parameters on the resulfurization were studied and the methods that could prevent resulfurization were proposed.<br>There are two kinds of mechanisms of resulfurization in the desulfurization process with magnesium. One is decomposition of the desulfurization product of MgS under the inert atmosphere. The other is oxidation of MgS under the oxidative atmosphere.<br>Under the present experimental conditions, lowering operating temperature and oxygen partial pressure in the atmosphere, and adding more pellets containing magnesium oxide and aluminum could effectively prevent the resulfurization. The resufurization took place more markedly by using Al₂O₃ crucible than by using MgO or C crucible.<br>Adding CaO onto the melt surface was an effective method for preventing the resulfurization due to transformation of the desulfurization product of MgS into the more stable compound of CaS. For prevention of the resulfurization, using the CaO-Al₂O₃ mixture is less effective than using only CaO. Since addition of the activated charcoal powders greatly decreased the transfer rate of oxygen in the atmosphere to the melt surface, it also reduced the resulfurization remarkably.

Journal

• ISIJ International

  ISIJ International 45 (12), 1795-1803, 2005

  The Iron and Steel Institute of Japan

Keywords

• desulfurization
• resulfurization
• magnesium vapor
• pellet
• magnesia
• aluminothermic reduction
• molten iron
• ultra-low sulfur steel.

Details

• CRID: 1390001206486941184
• NII Article ID: 10016909733
• NII Book ID: AA10680712
• DOI: 10.2355/isijinternational.45.1795
• COI: 1:CAS:528:DC%2BD28XhsVKltw%3D%3D
• ISSN: 13475460
• ISSN: 09151559
• ISSN: http://id.crossref.org/issn/00211583
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational/45/12/45_12_1795/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed