Acid-base interactions of sodium chloride with calcium carbonate during the formation of cement clinker

Interactions in the calcium carbonate — sodium chloride system were examined using the methods of radio spectroscopy and derivatography. As a result of specific interaction between them a decrease of spin-lattice relaxation is observed, with an increase of the signal amplitude in the EPR spectra. It is demonstrated that sodium chloride acts as a catalyst for thermal decomposition of calcium carbonate. Activation energy for decomposition of calcium carbonate decreases from 226 to 111 kJ/mol. It is suggested that in the process of thermal decomposition of calcite and sodium chloride volatile compounds of CO2·xNaCl are formed, having a non-stoichiometric composition

Author: A.N. Lopanov, E.A. Fanina

Section: Science and production

Keywords: calcium carbonate, sodium chloride, radiospectroscopy, derivatography