GELIFYING STUDIES IN THE SILICA-ZEOLITE S OL

The paper followed up the development of some composite materials, mad e up of silica sol and zeolite, having the necessary properties for ex trusion forming. Therefore a silica sol gelling study was performed, t o assess the influence of various process parameters, e.g. pH, SiO2 co ncentration in the sol, temperature, stirring conditions, etc., upon t he gelling duration. The results thus got were used as a base of the s ilica sol-zeolite system gelification study. The conclusion was that t he best material behaviour to extrusion were got under the following c onditions: room temperature, non-diluted silica sol, ph 6, and zeolite inclusion in the partially gelified sol.