Crystallization of NaMg-Mordenite on base of Obsidian and Antigorite

Earlier we have suggested the method of obtaining zeolites of Dachiardite and Ferrierite type in the form Na,Mg from various kinds of Perlite and Antigorite mixtures. In this work there has been shown the possibility of obtaining zeolite of a Mordenite type in Na,Mg form. The synthesis of this zeolite has been carried out by the method of hydrothermal processing of a hard mass, consisting obsidian and decationized metastable Antigorite (DMA) at the temperatures 170ºC. This silicate has been obtained by the acid processing of Antigorite – Mg3 [Si2O5].4H2O with the further thermal processing on the border of transmission of Antigorite → Forsterite (Mg2SiO4). The obtained reaction masses at the presence of NaOH are characterized by the following ratio of the components: Na2O/Al2O3 = 3.8 - 4.9; MgO/Al2O3 = 2.5 - 3.5; SiO2/Al2O3 = 12.5 - 14.8; H2O/Al2O3 = 80 - 95. It has been established the product of hydrothermal crystallization of these reaction masses is zeolite of a Mordenite type in Na,Mg form. The chemical composition of the obtained Mordenite has been determined, which is expressed by the following chemical formula: Na0.84Mg0.58 [(AlO2)2(SiO2)11.8].8.1H2O

Keywords:

Zeolite , Mordenite , Antigorite