Evaluation of factors affecting mineral carbonation of CO 2 using coal fly ash in aqueous solutions under ambient conditions

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Abstract

This study examined the factors affecting mineral carbonation to sequester CO 2 using coal fly ash (CFA) in aqueous solutions under ambient temperature and pressure conditions. Serial extraction and carbonation tests were conducted on CFA obtained from a coal-fired power plant as the following conditions were varied: solid dosage, CaO content, CO 2 flow rate, and solvent type. The solid dosage, CaO content, and solvent type affected the Ca extraction efficiency, which was well correlated with the carbonation efficiency. In addition, at a given Ca extraction efficiency, the CO 2 flow rate and the solvent type affected the rate and extent of CFA carbonation. Based on the study results, the CO 2 sequestration capacity of CFA under ambient temperature and pressure conditions was approximately 0.008kg of CO 2 per 1kg of CFA at the experimental test conditions (CaO content: 7wt.%, solid dosage: 100g/L, CO 2 flow rate: 2mL/min, and solvent: DI water).

Original languageEnglish
Pages (from-to)77-87
Number of pages11
JournalChemical Engineering Journal
Volume183
DOIs
Publication statusPublished - 2012 Feb 15

Keywords

  • Aqueous carbonation
  • CO
  • Coal fly ash
  • Mineral carbonation
  • Sequestration

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering
  • Environmental Chemistry

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