A. M. Kalinkin, E. V. Kalinkina, O. A. Zalkind, and T. I. Makarova
Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials, Kola Scientific Center,
Russian Academy of Sciences, ul. Fersmana 26a, Apatity, Murmansk oblast, 184209 Russia
Received March 5, 2007
Abstract—Processes proceeding during the heating of the samples of lithium, sodium, and potassium metasil-
icates mechanochemically activated in carbon dioxide are studied using thermal analysis, X-ray phase analysis,
and IR spectroscopy. Upon the heating of the samples of sodium and potassium metasilicates, the reversal of
phases occurs in the sequence according to their appearance during the mechanical treatment in the mill in the
atmosphere of carbon dioxide. Hydrocarbonates are first decomposed to neutral carbonates followed by their
interaction with silica to form metasilicates. In the course of thermal treatment of lithium sample, the metastable
carbonate–silicate phase, which is formed due to the intense mechanosorption of carbon dioxide, is decom-
posed first. Afterwards, lithium carbonate formed at the final stage of mechanoactivation reacts with SiO2.
DOI: 10.1134/S1061933X08010079
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