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Chemistry for Sustainable Development

2006 year, number 4

Mechanochemical Interaction of Calcium Carbonate with Diopside and Amorphous Silica

A. M. KALINKIN1, A. A. POLITOV2,3, E. V. KALINKINA1, O. A. ZALKIND1 and V. V. BOLDYREV2,3
1Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials,
Ul. Fersmana 26a, Murmansk Region, Apatity 184209 (Russia)
2Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of the Russian Academy of Sciences, Ul. Kutateladze 18, Novosibirsk 630128 (Russia)
3Novosibirsk State University,
Ul. Pirogova 2, Novosibirsk 630090 (Russia)
Pages: 333-343

Abstract

Processes that occur during mechanochemical activation of the mixtures of diopside with calcite and amorphous silicon dioxide with calcite in a centrifugal planetary mill are investigated. According to the data of IR spectroscopy and XPA, with calcite content up to ~10 mass %, mechanochemical interaction of the mixture components results in the formation of a substance which is similar to carbonate-containing silicate glass. During mechanochemical activation of a mixture of amorphous silicon dioxide with calcite (at a molar ratio of 1 : 1) the degree of interaction between the components decreases substantially, the major part of input mechanical energy is consumed for the achievement of mechanochemical equilibrium between calcite and aragonite. Investigated processes were compared with the previously discovered mechanically induced absorption of carbon dioxide by calcium- and magnesium-containing silicates. The data on phase formation under heating of mechanochemically activated mixtures of silica with calcite are reported.