Crystallization control for remediation of an FetO-rich CaO-SiO2-Al2O3-MgO EAF waste slag

Sung Suk Jung, Il Sohn

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

In this work, the crystallization behavior of synthesized Fe tO-rich electric arc furnace (EAF) waste slags with a basicity range of 0.7 to 1.08 was investigated. Crystal growth in the melts was observed in situ using a confocal laser scanning microscope, and a delayed crystallization for higher-basicity samples was observed in the continuous cooling transformation and time temperature transformation diagrams. This result is likely due to the polymerization of the melt structure as a result of the increased number of network-forming FeO4 and AlO4 units, as suggested by Raman analysis. The complex incorporation of Al and Fe ions in the form of AlO4 and FeO4 tetrahedral units dominant in the melt structure at a higher basicity constrained the precipitation of a magnetic, nonstoichiometric, and Fe-rich MgAlFeO4 primary phase. The growth of this spinel phase caused a clear compositional separation from amorphous phase during isothermal cooling at 1473 K leading to a clear separation between the primary and amorphous phases, allowing an efficient magnetic separation of Fe compounds from the slag for effective remediation and recycling of synthesized EAF waste slags for use in higher value-added ordinary Portland cement.

Original languageEnglish
Pages (from-to)1886-1892
Number of pages7
JournalEnvironmental Science and Technology
Volume48
Issue number3
DOIs
Publication statusPublished - 2014 Feb 4

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Electric arcs
Alkalinity
Crystallization
slag
Remediation
Slags
Furnaces
remediation
crystallization
melt
Cooling
cooling
Magnetic separation
Portland cement
polymerization
spinel
Recycling
cement
Microscopes
recycling

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

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Crystallization control for remediation of an FetO-rich CaO-SiO2-Al2O3-MgO EAF waste slag. / Jung, Sung Suk; Sohn, Il.

In: Environmental Science and Technology, Vol. 48, No. 3, 04.02.2014, p. 1886-1892.

Research output: Contribution to journalArticle

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