Bench-scale operation of a concrete sludge recycling plant

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

    研究成果: Article査読

    25 被引用数 (Scopus)


    A bench-scale plant for waste concrete sludge recycling was designed, constructed, and operated. Real concrete sludge generated from a pile and pole production plant and groundwater were used for the experiments. The process mainly consists of the extraction of calcium ions from the concrete sludge into the aqueous phase and the crystallization of calcium carbonate from the solution with CO 2. The CO 2 was supplied from boilers installed in the plant, where heavy oil is combusted. High-purity calcium carbonate (>99%) was obtained in the process, with particle sizes distributed in the range of 3-30 μm (volume-based), peaking at about 10 μm. A net reduction in CO 2 emissions can be achieved based on the process power consumption and the amount of product. The effects of operating conditions on process performance data such as calcium extraction rate and calcium carbonate crystallization rate were examined, which can lead to scaling-up of the plant.

    ジャーナルIndustrial and Engineering Chemistry Research
    出版ステータスPublished - 2012 5 2

    ASJC Scopus subject areas

    • 化学 (全般)
    • 化学工学(全般)
    • 産業および生産工学


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