CO2 mineralization using basic oxygen furnace slag: Process optimization by response surface methodology

Yong Sun, Gang Yang, Kevin Li, Lai-Chang Zhang, Lian Zhang

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The basic oxygen furnace steelmaking slag (SL) is employed for CO2 mineralization. Response surface methodology and the central composite design were employed in determining the optimal condition. The optimization goal in this paper has been set for maximum CO2 capturing. It was found that the reaction temperature and CO2 pressure and their combination were significant. A quadratic model was developed for process optimization and statistical experimental designs. The CO2 capture capacity could reach 126 gCO2/kg SL at optimal condition. The increased reaction temperature will lead to an obvious decrease of CaCO3 and increase of MgCO3. If deployed, this optimized indirect CO2 mineral sequestration process could permanently capture 252,000 tons of CO2 per annum based upon current 2 million tons of SL productivity per annum.
Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalEnvironmental Earth Sciences
Issue number19
Publication statusPublished - 2016


  • Steelmaking slag
  • CO2 mineral sequestration
  • Statistical analysis
  • Optimization

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