Selective Separation of Fe-Concentrates in EAF Slags Using Mechanical Dissimilarity of Solid Phases

Sung Suk Jung, Keeyoung Jung, Il Sohn

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We sought to develop an optimized particle size-dependent separation method to lower the Fe content of pulverized glass-ceramic electric arc furnace (EAF) slag for its improved reclamation as construction materials by considering the structures and the mechanical behavior of the discrete solid phases. After an isothermal crystallization process to enhance the spinel growth, the Vickers hardness and fracture toughness were measured on the spinel and amorphous phases separately from the solidified slag using indentation methods. The characteristic differences in the hardness of the phases were magnified when this glass-ceramic composite was isothermally crystallized. The hardness of the spinel was observed to be lower in slags with higher Fe t O/Al 2 O 3 mass ratios due to the triclinic unit cell expansion of the spinel, whereas the hardness of the amorphous phase decreased with increasing isothermal period because of the structural transformation into a silicate-dominant network. Fracture toughness could be calculated based on the hardness and crack length, where the Young’s modulus was determined using nanoindentation. The amorphous phase with a lower Fe content and lower fracture toughness resulted in finer powder distribution after pulverization, allowing better separation of the primary crystalline spinel containing higher Fe content from the Fe-deficient amorphous phase according to the particle size.

Original languageEnglish
Pages (from-to)617-626
Number of pages10
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume48
Issue number2
DOIs
Publication statusPublished - 2017 Feb 1

Fingerprint

electric arcs
slags
Electric arcs
Slags
spinel
furnaces
solid phases
Furnaces
Hardness
Fracture toughness
hardness
fracture strength
Glass ceramics
Particle size
Vickers hardness
reclamation
ceramics
Reclamation
Nanoindentation
Silicates

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Selective Separation of Fe-Concentrates in EAF Slags Using Mechanical Dissimilarity of Solid Phases",
abstract = "We sought to develop an optimized particle size-dependent separation method to lower the Fe content of pulverized glass-ceramic electric arc furnace (EAF) slag for its improved reclamation as construction materials by considering the structures and the mechanical behavior of the discrete solid phases. After an isothermal crystallization process to enhance the spinel growth, the Vickers hardness and fracture toughness were measured on the spinel and amorphous phases separately from the solidified slag using indentation methods. The characteristic differences in the hardness of the phases were magnified when this glass-ceramic composite was isothermally crystallized. The hardness of the spinel was observed to be lower in slags with higher Fe t O/Al 2 O 3 mass ratios due to the triclinic unit cell expansion of the spinel, whereas the hardness of the amorphous phase decreased with increasing isothermal period because of the structural transformation into a silicate-dominant network. Fracture toughness could be calculated based on the hardness and crack length, where the Young’s modulus was determined using nanoindentation. The amorphous phase with a lower Fe content and lower fracture toughness resulted in finer powder distribution after pulverization, allowing better separation of the primary crystalline spinel containing higher Fe content from the Fe-deficient amorphous phase according to the particle size.",
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Selective Separation of Fe-Concentrates in EAF Slags Using Mechanical Dissimilarity of Solid Phases. / Jung, Sung Suk; Jung, Keeyoung; Sohn, Il.

In: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 48, No. 2, 01.02.2017, p. 617-626.

Research output: Contribution to journalArticle

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