Direct aqueous carbonation on olivine at a CO2 partial pressure of 6.5 MPa

Jiajie Li, Anthony D. Jacobs and Michael Hitch

Energy, 2019, vol. 173, issue C, 902-910

Abstract: Ex-situ mineral carbonation via direct aqueous process at a low CO2 partial pressure (pCO2) is a motivating factor for promoting industrial application. The carbonation extent meets a plateau around CO2 supercritical pressure, making carbonation at the lower part of the plateau attractive in an energy saving prospective. This paper investigated the mechanism of olivine carbonation using a buffer solution with NaHCO3 and NaCl, at 185 °C and 6.5 MPa of pCO2. The results obtained show that when the dissolution of magnesium silicate is effective in the solution, carbonation at relative low pCO2 is preferred due to the slight enhancement of aqueous CO32− concentration and pH in the solution. The optimum NaHCO3 concentration is not 0.64 mol/L at 6.5 MPa of pCO2, and further addition of sodium salts (NaCl and NaHCO3) is necessary to enhance the carbonation extent. The optimum NaHCO3 concentration at low pCO2 could be reduced through increasing the carbonation time and reducing the particle size. The passivation layer was not formed under the experimental condition. Agitation is necessary to be optimized to prevent settlement of solids in the solution. The successful sequestration of CO2 using olivine at a pCO2 of 6.5 MPa can aid in reducing energy requirements.

Keywords: CO2 sequestration; Olivine; CO2 partial pressure; Direct aqueous carbonation (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S036054421930324X
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:173:y:2019:i:c:p:902-910

DOI: 10.1016/j.energy.2019.02.125

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().