Journal
CHEMICAL ENGINEERING & TECHNOLOGY
Volume 33, Issue 7, Pages 1177-1183Publisher
WILEY-BLACKWELL
DOI: 10.1002/ceat.201000024
Keywords
Carbonation; CO2 Sequestration; Extraction; Wollastonite
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Funding
- Shell (China) Limited
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A new CO2 sequestration approach through indirect wollastonite carbonation is proposed to mitigate anthropogenic CO2 emissions from fossil fuel combustion. The wollastonite carbonation process includes three steps: (1) dissolution of wollastonite in hydrochloric acid to leach Ca2+ from mineral matrix; (2) reaction of the resulting CaCl2 solution with CO2 in triisooctylamine (TIOA) at low temperature, producing CaCO3 and an amino acid complex; (3) regeneration of the extractant and acid by backextraction through a temperature swing process and recycling to the dissolution and carbonation steps. It was found that the wollastonite dissolution rate was accelerated by hydrochloric acid and a maximum Ca2+ dissolution extent of 95 % was obtained.
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