The reactions of CaO and Ca(OH) 2 with CO 2 during mechanical activation are studied by IR spectroscopy, x-ray diffraction, and thermal analysis. The results indicate that the earlier described extensive sorption of CO 2 by Ca-containing silicates during grinding is not related to the formation of CaO or Ca(OH) 2 . Mechanical activation in CO 2 converts calcium oxide to amorphous CaCO 3 and calcium hydroxide to calcite, whereas Ca-containing silicates under such conditions homogeneously dissolve CO 2 to form a material similar to analogous carbonate-containing silicate glasses.

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