Aqueous mineral carbonation process via concrete sludge

Atsushi Iizuka, Masato Honma, Yasuyuki Hayakawa, Akihiro Yamasaki, Yukio Yanagisawa

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    A new carbon dioxide sequestration process was proposed. The process consists mainly of a calcium extraction step from concrete sludge by water dilution with stirring and a calcium carbonate precipitation step by the reaction of extraction solution and gaseous carbon dioxide. Experimental data for the proposed process was obtained using real concrete sludge generated from a concrete pole/pile plant. The influences of water dilution ratio (weight ratio: 3-50) and extraction treatment time (5-40 min) on the calcium extraction rate from concrete sludge were investigated. It was confirmed that the calcium concentration in water increased sufficiently for calcium carbonate to be precipitated by the reaction with gas containing carbon dioxide (10%). In the range of experimental conditions studied, the dilution ratio of 20 and the extraction time of 5 min were found to be the optimal treatment conditions for calcium extraction from concrete sludge. The calcium carbonate precipitation step from calcium solution is easily accelerated by the addition of seed crystals. These results indicate that concrete sludge can be used as a cheap calcium resource for carbon dioxide sequestration.

    Original languageEnglish
    Pages (from-to)129-134
    Number of pages6
    Journalkagaku kogaku ronbunshu
    Volume38
    Issue number2
    DOIs
    Publication statusPublished - 2012 Apr 4

    Keywords

    • Calcium carbonate
    • Carbon dioxide
    • Concrete sludge
    • Recycle

    ASJC Scopus subject areas

    • Chemistry(all)
    • Chemical Engineering(all)

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