CO2 Sorption during Mechanical Activation of Sodium and Calcium Aluminosilicates

Data are presented on CO2 sorption by natural Na- and Ca-containing aluminosilicates (plagio-clases) during mechanical activation in an AGO-2 centrifugal planetary mill filled with CO2. IR spectroscopy, chemical analysis, x-ray diffraction, and thermal analysis are used to determine the amount of absorbed CO2 and to elucidate the mechanism of its incorporation into the aluminosilicates during grinding. The results, similar in a number of aspects to those reported for Ca- and Mg-containing silicates, lend support to the conclusion made earlier that CO2 absorption by silicate minerals during mechanical activation and CO2 dissolution in silicate melts have many features in common.