Abstract
The mechanical activation (MA) of diopside in a controlled CO2 atmosphere was studied using different grinding facilities. The results demonstrate that diopside may sorb CO2 by two mechanisms, depending on the nature of the MA process. If grinding is not accompanied by structure breakdown, the sorption process is similar to that reported for metal oxides, and the adsorbate consists of undistorted CO3 2- groups. If the MA process leads to diopside amorphization, CO2 is sorbed in the form of distorted carbonate groups, and the IR spectrum contains a split absorption band (1433 and 1522 cm–1) similar to the CO3 2- band in the spectra of carbonate-containing silicate glasses. After ball milling in an AL-1000 mechanical activator in CO2 for 580 min, diopside contains up to 15 wt % CO2 . Subsequent heating ensures partial or complete removal of the carbonate. Acid treatment of diopside after MA in CO2 leads to decomposition of the carbonate and almost complete leaching of the Ca and Mg cations.
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Kalinkin, A.M., Politov, A.A., Boldyrev, V.V. et al. Mechanical Activation of Diopside in CO2. Inorganic Materials 38, 163–167 (2002). https://doi.org/10.1023/A:1014021312359
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DOI: https://doi.org/10.1023/A:1014021312359