Effect of solidification and cooling methods on the efficacy of slag as a feedstock for CO2 mineralization

Corey Adam Myers, Takao Nakagaki

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Iron and steel making (ISM) slag is often utilized to partially offset CO2 emissions associated with metal production. Currently, the primary recycling method for slag is as-Ca2SiO4 utilized in the cement industry, termed ground granulated blast furnace slag (ggbs). However, the cement market is not large enough to exploit the entirety of ISM slag as ggbs, relegating a large quantity of slag to reuse pathways with minor impacts on CO2 reduction. Recent years have seen an increase in research into mineralizing CO2 using the Ca and Mg content of ISM slags as a feedstock. Unfortunately, it has not been widely recognized that the solidification and cooling processes of slag dramatically effects its efficacy as a CO2 mineralizing feedstock via modification of mineralogy, crystallinity, grain size, and micromorphology. This paper clarifies the key properties determining mineralization effectiveness and elucidates how to control these properties during the solidification and cooling process. The effect of solidification and cooling method on net CO2 reduction is shown to be strongly dependent on solidification and cooling method along with the CO2 intensity of energy generation..

Original languageEnglish
Pages (from-to)211-219
Number of pages9
Journalisij international
Volume58
Issue number2
DOIs
Publication statusPublished - 2018 Jan 1

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Keywords

  • CCUS
  • CO
  • Ggbs
  • Ironmaking
  • Mineralization
  • Slag
  • Steelmaking

ASJC Scopus subject areas

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

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