DEVELOPMENT OF A BINDING -FREE METHOD FOR THE SYNTHESIS OF ALUMINOSILICATES NaA

The work shows that only at least 30% of the initial grains (granules) can be included, and after crystallization of the artificially obtained highly dispersed NaA aluminosilicate, a product with a degree of crystallinity close to 100% can be obtained, and in the absence of additives, a hydrosodalite phase can be obtained. A "sol-gel" method for the synthesis of mesoporous aluminosilicate has been developed. The gel for the two-stage synthesis of mesoporous aluminosilicate was prepared according to the following method: 50.0 ml of tetraethyl orthosilicate, kaolin, sodium hydroxide, ethyl alcohol, hexamethylenediamine and citric acid and 50.0 ml of ethanol solution were added to 50.0 ml of H2O solution. 12.0 ml of 0.1 M NaOH and 50.0 ml of hexamethylenediamine were added in a thin stream and the mixture was left with intensive stirring for 10 minutes. To increase the binding-free crystallinity of the artificially obtained mesoporous aluminosilicate NaA to ~100%, a method of loosening additives to a highly dispersed mesoporous artificially obtained aluminosilicate of the same structural type synthesized from highly active methacaolin has been developed. it is mixed with kaolin from the mine in a ratio of 30-70 /70-30%, respectively.

The aim of the work is to develop a method for the synthesis of NaA aluminosilicate without binders.