Mechanochemical Modification of the Reactivity of Natural Zeolites
O. N. DABIZHA1, T. V. DERBENEVA1, A. N. KHATKOVA1, R. A. FILENKO2, T. P. PATEYUK1
1Transbaikalian State University, Ul. Aleksandro-Zavodskaya 30, Chita 672039 (Russia)
2Institute of Natural Resources, Ecology and Cryology, Siberian Branch of the Russian Academy of Sciences, Ul. Nedorezova 16a, Chita 672014 (Russia)
Keywords: реакционная способность, природные цеолиты, механоактивация, кинетические параметры, термодинамические потенциалы, степень разупорядочения, гидратация, карбонизация, reactivity, natural zeolites, mechanical activation, kinetic parameters, thermodynamic potentials, disordering degree, hydration, carbonization
Abstract
Structural-chemical changes in high-silica zeolite-containing rocks from the Kholinskoye and Shivyrtuy deposits (Russia) under the action of mechanical activation in a laboratory vibrogrinder were studied by means of differential scanning calorimetry, thermogravimetry, densimetry, air permeability measurement, atomic emission spectroscopy with inductively coupled plasma, infrared spectroscopy, X-ray phase analysis. The kinetic parameters of dehydration of initial and mechanically activated natural zeolites were calculated (apparent activation energy, pre-exponential factor), as well as their thermodynamic potentials (enthalpy of formation, entropy and Gibbs energy), and disordering degree. The degree of carbonization of the samples under study was estimated with the help of the analysis of infrared spectra and thermogravigrams. It was demonstrated that the change of the reactivity of natural zeolites as a result of mechanochemical treatment is determined by the phase composition off initial samples.
|
