In Situ Observation of Aluminothermic Reduction of MgO with High Temperature Optical Microscope

• 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

• Liu Zhongzhu

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

• Asano Takashi

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

• Sano Masamichi

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

Abstract

Desulfurization and deoxidation of molten iron with magnesium vapor produced in-situ by aluminothermic reduction of magnesium oxide has been developed. In the present study, the mechanism of aluminothermic reduction of magnesium oxide by use of pellets composed of magnesium oxide and aluminum powders was discussed. SEM observation of the pellets at different reduction stages for various temperatures showed that fracture and disappearance of the alumina films on the aluminum particles were stimulated above 1 473 K, and thus the reduction of magnesium oxide was greatly accelerated.<br>From in-situ observation of the aluminothermic reduction of magnesium oxide using a high temperature optical microscope (HTOM), it was found that the reduction proceeded after the penetration of molten aluminum into the magnesium oxide phase. The penetration began at 1 273 K and it was accelerated above 1 373 K. The reduction took place violently at 1 473 K. SEM observation and EDS analysis of the cooled sample revealed that the penetration took place only through cracks of the alumina film.<br>In-situ observation of the melting process of aluminum particles together with SEM observation of the cooled sample showed that the thermal stress and the stress formed during phase transformation could break up the alumina film and the outflow of molten aluminum did take place at the elevated temperature.

Journal

• ISIJ International

  ISIJ International 46 (2), 202-209, 2006

  The Iron and Steel Institute of Japan

Keywords

• MgO
• aluminothermic reduction
• penetration of molten aluminum
• alumina film
• aluminum particles
• Mg vapor
• high temperature optical microscope
• <i>in-situ</i> observation

Details

• CRID: 1390001206486313728
• NII Article ID: 10017491209
• NII Book ID: AA10680712
• DOI: 10.2355/isijinternational.46.202
• COI: 1:CAS:528:DC%2BD28XisFKktL0%3D
• ISSN: 13475460
• ISSN: 09151559
• ISSN: http://id.crossref.org/issn/00211583
• Web Site: http://www.jstage.jst.go.jp/article/isijinternational/46/2/46_2_202/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed