Development of a novel process for energy and materials recovery in steelmaking slags

Juncheng Li, Debashish Bhattacharjee, Xiaojun Hu, Dianwei Zhang, Seetharaman Sridhar, Zushu Li

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

This work aims at gathering fundamental knowledge for the development of a novel process for energy (H2 gas) and materials (magnetite Fe3O4) recovery in hot-steelmaking slags by reacting molten steelmaking slag with steam. Thermodynamic simulation was carried out to calculate the accumulated amount of produced H2 gas as a function of the volume of H2O–Ar gas introduced and the precipitated phases of the molten slags during controlled cooling. Laboratory experiments of crystallization behaviours of molten slags during cooling were visualized in situ through a confocal laser scanning microscope, and the cooled slags obtained were characterized by using SEM-EDS and XRD. CCT diagrams for different slags were created showing the slag crystallization/phase transformation at different cooling rates. The recovery ratio of H2 gas and the maximum potential recovery ratio of iron oxide in the oxidized slags were calculated, which concludes that with increasing the slag basicity from 1.0 to 1.5 and 2.0, the recovery ratio of H2 was found to increase from 12.6 to 23.7% and 22.6%, and the maximum potential recovery ratio of iron oxide was found to increase from 18.3 to 34.4% and 32.8% under the investigated conditions.

Original languageEnglish (US)
Pages (from-to)94-105
Number of pages12
JournalTransactions of the Institutions of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy
Volume126
Issue number1-2
DOIs
StatePublished - Apr 3 2017
Externally publishedYes

Keywords

  • CCT diagram
  • H gas
  • recovery
  • spinel
  • Steelmaking slag

ASJC Scopus subject areas

  • Chemistry(all)
  • Geotechnical Engineering and Engineering Geology
  • Geochemistry and Petrology

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