Dissolution rates of alkaline rocks by carbonic acid: Influence of solid/liquid ratio, temperature, and CO2 pressure

Yoshinobu Abe, Atsushi Iizuka, Hiroki Nagasawa, Akihiro Yamasaki, Yukio Yanagisawa

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)933-941
    Number of pages9
    JournalChemical Engineering Research and Design
    Volume91
    Issue number5
    DOIs
    Publication statusPublished - 2013 May

    Keywords

    • Carbon capture and storage
    • Carbon dioxide
    • Global warming
    • Mineral carbonation

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)

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