TY - JOUR
T1 - Dissolution rates of alkaline rocks by carbonic acid
T2 - Influence of solid/liquid ratio, temperature, and CO2 pressure
AU - Abe, Yoshinobu
AU - Iizuka, Atsushi
AU - Nagasawa, Hiroki
AU - Yamasaki, Akihiro
AU - Yanagisawa, Yukio
PY - 2013/5
Y1 - 2013/5
N2 - Dissolution rates of alkaline rocks, including wollastonite (CaSiO3), olivine (Mg2SiO4), and phlogopite (KMg3AlSi3O10(OH)2), with high pressure aqueous CO2 solution were measured to examine the feasibility of CO2 fixation via carbonation. Influence of solid/liquid ratio (1.0-10g/250mL), temperature (303-353K), and CO2 pressure (1.0-3.0MPa) on the extraction rates of calcium or magnesium ions was investigated. Under the experimental conditions studied, the calcium ion extraction rate from wollastonite was the highest among the three rock samples studied. The calcium concentration reached about 120mg/L, and about 12% of the calcium in wollastonite sample was extracted after 60min at 353K with 1.0MPa CO2. The calcium and magnesium extraction ratios from the alkaline rocks were much lower than those from waste concrete powder. Increasing the extraction time and temperature would be an effective way to promote calcium extraction from wollastonite.
AB - Dissolution rates of alkaline rocks, including wollastonite (CaSiO3), olivine (Mg2SiO4), and phlogopite (KMg3AlSi3O10(OH)2), with high pressure aqueous CO2 solution were measured to examine the feasibility of CO2 fixation via carbonation. Influence of solid/liquid ratio (1.0-10g/250mL), temperature (303-353K), and CO2 pressure (1.0-3.0MPa) on the extraction rates of calcium or magnesium ions was investigated. Under the experimental conditions studied, the calcium ion extraction rate from wollastonite was the highest among the three rock samples studied. The calcium concentration reached about 120mg/L, and about 12% of the calcium in wollastonite sample was extracted after 60min at 353K with 1.0MPa CO2. The calcium and magnesium extraction ratios from the alkaline rocks were much lower than those from waste concrete powder. Increasing the extraction time and temperature would be an effective way to promote calcium extraction from wollastonite.
KW - Carbon capture and storage
KW - Carbon dioxide
KW - Global warming
KW - Mineral carbonation
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U2 - 10.1016/j.cherd.2012.09.001
DO - 10.1016/j.cherd.2012.09.001
M3 - Article
AN - SCOPUS:84877603693
SN - 0263-8762
VL - 91
SP - 933
EP - 941
JO - Chemical Engineering Research and Design
JF - Chemical Engineering Research and Design
IS - 5
ER -