MODIFICATION THE NATURAL ZEOLITE OF NAKHCHIVAN IN THE ALKALINE ENVIRONMENT
Based on the natural mineral of Nakhchivan, a number of zeolites of different structural types were synthesized. The modification of the natural zeolite was carried out under hydrothermal conditions, in aqueous solutions of LiOH, KOH, NaOH and Ca(OH)2, and also in the presence of mineralizers (LiCl, KCl, NaCl, CaCl2) in an autoclave. Based on the IR spectroscopic, X-ray phase and elemental analyzes, it was shown that when hydrothermal treatment, the natural zeolite is converted to other minerals of important for practices of zeolite group. It was found that mordenite retains the stability of the structure in alkali solutions (LiOH, KOH, NaOH, Ca(OH)2) at a concentration of 1 N at a temperature of up to 100°C for 10 hours. When the conditions of hydrothermal treatment change a natural zeolite transforms, which gradually converts it into hydrosodalite through mineral phases: chabasite, heylandite, clinoptilolite, analcime, phillipsite, faujasite, scapolite, zeolite M, jismondine, leucite, calculite. The presence of mineralizers in the medium leads to the production of other structural types of zeolites, as compared to the thermal solution.