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

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1069-1077
Number of pages9
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume43
Issue number5
DOIs
Publication statusPublished - 2012 Oct
Externally publishedYes

Fingerprint

slags
Sulfur
Partial pressure
Slags
partial pressure
Molten materials
sulfur
Oxygen
Liquids
oxygen
liquids
Steelmaking
Oxides
Metals
oxides
Activity coefficients
Sulfides
metals
sulfides
purity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Mechanics of Materials
  • Materials Chemistry

Cite this

Influence of partial pressure of sulfur and oxygen on distribution of fe and mn between liquid fe-mn oxysulfide and molten slag. / Kim, Sun Joong; Shibata, Hiroyuki; Takekawa, Jun; Kitamura, Shin Ya; Yamaguchi, Katsunori; Kang, Youn Bae.

In: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Vol. 43, No. 5, 10.2012, p. 1069-1077.

Research output: Contribution to journalArticle

@article{50cc27f9f9b446b0a43203848ed10f45,
title = "Influence of partial pressure of sulfur and oxygen on distribution of fe and mn between liquid fe-mn oxysulfide and molten slag",
abstract = "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.",
author = "Kim, {Sun Joong} and Hiroyuki Shibata and Jun Takekawa and Kitamura, {Shin Ya} and Katsunori Yamaguchi and Kang, {Youn Bae}",
year = "2012",
month = "10",
doi = "10.1007/s11663-012-9684-9",
language = "English",
volume = "43",
pages = "1069--1077",
journal = "Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science",
issn = "1073-5615",
publisher = "Springer International Publishing AG",
number = "5",

}

TY - JOUR

T1 - Influence of partial pressure of sulfur and oxygen on distribution of fe and mn between liquid fe-mn oxysulfide and molten slag

AU - Kim, Sun Joong

AU - Shibata, Hiroyuki

AU - Takekawa, Jun

AU - Kitamura, Shin Ya

AU - Yamaguchi, Katsunori

AU - Kang, Youn Bae

PY - 2012/10

Y1 - 2012/10

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84869883089&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84869883089&partnerID=8YFLogxK

U2 - 10.1007/s11663-012-9684-9

DO - 10.1007/s11663-012-9684-9

M3 - Article

AN - SCOPUS:84869883089

VL - 43

SP - 1069

EP - 1077

JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

SN - 1073-5615

IS - 5

ER -