Ind. Eng. Chem. Res. 2009, 48, 3303–3307
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Improvement of Desulfurization Performances of Waste Cement Particles by Acid Treatment Jiawei Wu,† Atsushi Iizuka,† Kazukiyo Kumagai,† Akihiro Yamasaki,‡ and Yukio Yanagisawa*,† Department of EnVironment Systems, Graduate School of Frontier Science, The UniVersity of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba, Japan 277-8563, and Department of Materials and Life Science, Seikei UniVersity, 3-3-1 Kichijoji-kitamachi, Musashino, Tokyo, Japan 180-8633
We studied the effect of acid treatments on the desulfurization rate of waste cement, a byproduct in the recycling of aggregates from waste concrete. Calcium components in the waste cement were partially extracted by treatment with carbonic acid (aqueous solution of high-pressure CO2), hydrochloric acid, or acetic acid. The desulfurization rate was examined using a thermogravimetric method. The desulfurization rates in the initial stage of the reaction (
