Influence of partial pressure of sulfur and oxygen on distribution of fe and mn between liquid fe-mn oxysulfide and molten slag

Sun Joong Kim, Hiroyuki Shibata, Jun Takekawa, Shin Ya Kitamura, Katsunori Yamaguchi, Youn Bae Kang

研究成果: Article査読

13 被引用数 (Scopus)

抄録

The authors proposed an innovative process for recovering Mn from steelmaking slag. The process starts with the sulfurization of steelmaking slag to separate P from Mn by the formation of a liquid sulfide phase (matte). Then, the obtained matte is weakly oxidized to make a Mn-rich oxide phase without P. High-purity Fe-Mn alloys can therefore be produced by the reduction of the Mn-rich oxide phase. However, to the authors' knowledge, the sulfurization of molten slag containing P and Mn has not been sufficiently investigated. It was recently found that P was not distributed to the matte in equilibrium with the molten slag. To gain knowledge of the process's development, it is important to investigate the influence of the partial pressures of sulfur and oxygen on the equilibrium distribution of Mn and Fe between the matte and the molten slag. In the current work, a mineralogical microstructure analysis of the matte revealed that the existence of the oxysulfide and metal phases was dependent on the partial pressure of sulfur and oxygen. The Mn content of the matte increased with partial pressure of sulfur while the O content of the matte decreased. In contrast, the ratio of Mn/Fe in the matte was constant when the metal phase of the matte was observed at a log PO2 below -11. These results also corresponded to the relationship between the activity coefficient ratio of MnS/FeS and the mole fraction of MnS/FeS in the matte. The γMnS/γFeS value decreased exponentially as the mole fraction of MnS/FeS increased.

本文言語English
ページ(範囲)1069-1077
ページ数9
ジャーナルMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
43
5
DOI
出版ステータスPublished - 2012 10
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金
  • 材料化学

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