Performance evaluation for carbonation of steel-making slags in a slurry reactor

E. E. Chang, Chung Hua Chen, Yi Hung Chen, Shu Yuan Pan, Pen Chi Chiang

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Abstract

CO2 sequestration by the aqueous carbonation of steel-making slag under various operational conditions was investigated in this study. The effects of the operational conditions, including type of steel-making slag, reaction time, reaction temperature, and CO2 flow rate, on the performance of the carbonation process were evaluated. The results indicated that the BOF slag had the highest carbonation conversion, approximately 72%, at a reaction time of 1h, an operating pressure of 101kPa and a temperature of 60°C due to its higher BET surface area of BOF slag compared to UF, FA, and BHC slags. The major factors affecting the carbonation conversion are reaction time and temperature. The reaction kinetics of the carbonation conversion can be expressed by the shrinking-core model. The measurements of the carbonated material by the SEM and XRD instruments provide evidence indicating the suitability of using the shrinking-core model in this investigation. Comparison of the results with other studies suggests that aqueous carbonation by slurry reactor is viable due to its higher mass transfer rate.

Original languageEnglish
Pages (from-to)558-564
Number of pages7
JournalJournal of Hazardous Materials
Volume186
Issue number1
DOIs
Publication statusPublished - Feb 15 2011

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Keywords

  • Aqueous carbonation
  • Basic oxygen furnace slag
  • Calcite
  • Kinetics
  • Mineral sequestration of CO
  • Shrinking-core model

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Environmental Chemistry
  • Environmental Engineering

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