Effects of carbonation on the mineral composition of cement kiln dust

Cecilia P. Anderson, Lawrence L. Sutter, Deborah N. Huntzinger, John S. Gierke

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Due to their relatively high calcium oxide content, industrial mineral oxide wastes are potential candidates for mineral sequestration of carbon dioxide (CO2). Cement kiln dust (CKD) contains 20-60% CaO making it a possible candidate for CO2 sequestration. In this study, three types of CKD are characterized, before and after carbonation, using environmental scanning electron microscopy and energy dispersive x-ray microanalysis to determine the mineralogical and morphological changes occurring due to carbonation. The reactants, products, and precipitation mechanisms were investigated to enhance understanding of the governing processes and allow better utilization of CKD for CO2 sequestration. The results of multiple independent analyses confirmed the formation of CaCO3 during carbonation. Examinations of the reaction pathways found that CaO and calcium hydroxide (Ca(OH)2) were the major reactants. Three types of CaCO3 precipitation mechanisms were observed: (1) diffusion of CO2 into Ca(OH)2 particles causing precipitation in the pores of the particle and the growth of a CaCO3 skin from the outside inward, (2) precipitation onto existing particles, and (3) precipitation from aqueous solution. The CaCO3 skin may slow further diffusion of CO2 into a particle, thus slowing the overall sequestration rate.

Original languageEnglish (US)
Title of host publicationInternational Cement Microscopy Association - 29th International Conference on Cement Microscopy 2007
Pages441-470
Number of pages30
StatePublished - Dec 1 2007
Externally publishedYes
Event29th International Conference on Cement Microscopy 2007 - Quebec City, QC, Canada
Duration: May 20 2007May 24 2007

Publication series

NameInternational Cement Microscopy Association - 29th International Conference on Cement Microscopy 2007

Other

Other29th International Conference on Cement Microscopy 2007
CountryCanada
CityQuebec City, QC
Period5/20/075/24/07

ASJC Scopus subject areas

  • Mechanics of Materials
  • Building and Construction

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  • Cite this

    Anderson, C. P., Sutter, L. L., Huntzinger, D. N., & Gierke, J. S. (2007). Effects of carbonation on the mineral composition of cement kiln dust. In International Cement Microscopy Association - 29th International Conference on Cement Microscopy 2007 (pp. 441-470). (International Cement Microscopy Association - 29th International Conference on Cement Microscopy 2007).