Thermodynamics of copper dissolution into MnO-SiO2-MnS inclusion system

Jin Gyun Park, Joo Hyun Park, Young Seok Lee, Sung Mo Jung, Dong Joon Min

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Recently, a new process has been introduced to control α-γ transformation of steels using cuprous sulfide precipitates on the MnO bearing oxide inclusion as well as MnS. In order to optimize the composition of inclusions, the solubility of copper into MnO-SiO2-MnS system were measured at 1 523 K and a dissolution mechanism of copper into an oxy-sulfide melts and cuprous sulfide capacity has been proposed. The solubility of copper increased with an increase in MnO/(MnO+SiO2) ratio and showed a maximum solubility at MnO and MnS doubly saturated composition, which was consistent with the maximum precipitation ratio of CuS. Deliberating an oxy-sulfide melts saturated with MnS, MnO, and SiO2 at 1 523 K, the phase diagram for the MnO-SiO2-MnS system indicated that the activity coefficient of cuprous sulfide in an oxy-sulfide melts was dependent on the activity of MnO and the activity coefficient of MnS. The dissolution mechanism of copper into a MnO-MnS inclusion system was confirmed and cuprous sulfide capacity was also defined from the reaction mechanism. Cuprous sulfide capacity for the MnO-MnS bearing inclusion strongly depends on stability of sulfide and basicity. The experimental results revealed that the optimized composition for inclusion to dissolve copper was (mass%MnO)=43.6, (mass%SiO2)=1.8 and (mass%MnS)=54.6. Consequently, it could be proposed that the harmlessness of copper in scrap and dispersion strengthening could be possible by using the non-metallic inclusion technique.

Original languageEnglish
Pages (from-to)171-177
Number of pages7
JournalISIJ International
Volume49
Issue number2
DOIs
Publication statusPublished - 2009 Jun 8

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Copper
Dissolution
Thermodynamics
Sulfides
Bearings (structural)
Solubility
Activity coefficients
Chemical analysis
Steel
Alkalinity
Oxides
Phase diagrams
Precipitates
Strengthening (metal)
cuprous sulfide

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Park, Jin Gyun ; Park, Joo Hyun ; Lee, Young Seok ; Jung, Sung Mo ; Min, Dong Joon. / Thermodynamics of copper dissolution into MnO-SiO2-MnS inclusion system. In: ISIJ International. 2009 ; Vol. 49, No. 2. pp. 171-177.
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Thermodynamics of copper dissolution into MnO-SiO2-MnS inclusion system. / Park, Jin Gyun; Park, Joo Hyun; Lee, Young Seok; Jung, Sung Mo; Min, Dong Joon.

In: ISIJ International, Vol. 49, No. 2, 08.06.2009, p. 171-177.

Research output: Contribution to journalArticle

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AU - Park, Joo Hyun

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