A study in the thermodynamic behavior of nickel in the MgO-SiO 2-FeO slag system

Jin Gyun Park, Hyung Sub Eom, Wan Wook Huh, Young Seok Lee, Dong Joon Min, Il Sohn

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The dissolution behavior of nickel in the MgO-SiO2-FeO slag system was investigated by using the thermodynamic equilibrium technique. Nickel distribution ratio between molten MgO-SiO2-FeO slag and molten Fe-Ni alloy at 1773K and 1873K was measured to understand the dissolution mechanism of nickel into the slags. In particular, the effect of oxygen potential and basicity on the distribution of nickel was investigated. Nickel distribution between slag and Fe-Ni alloy increased with higher oxygen potential showing a slope of 1/2. For basic slag systems near the olivine saturated composition, the nickel distribution ratio increased with higher basicity and for acidic slag systems near the cristobalite saturated composition, the nickel distribution ratio decreased with higher basicity. Thus, the nickel dissolution into the MgO-SiO2-FeO slag system showed two independent mechanisms similar to that found in the CaO-SiO2-CaF2 system. Ni + 1/2 O 2(g) + O2- = NiO22-(slag) (Olivinesatd:) Ni + 1/2 O2(g) = Ni2+(slag) (Cristobalite:satd.f ) The contour of the iso distribution ratio was represented in the MgO-SiO2-FeO ternary phase diagram. From the results, an optimum slag composition was determined to be near the olivine saturated with approximately XMgO/XSiO2 of 0.8 at 1773K and 1.0 at 1873K.

Original languageEnglish
Pages (from-to)415-421
Number of pages7
JournalSteel Research International
Volume82
Issue number4
DOIs
Publication statusPublished - 2011 Apr 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'A study in the thermodynamic behavior of nickel in the MgO-SiO <sub>2</sub>-FeO slag system'. Together they form a unique fingerprint.

  • Cite this