PROCESS FOR THE MANUFACTURE OF A SYNTHETIC SILICOALUMINATE AND PRODUCTS OBTAINED

摘要

1. A process for the production of an alkali-metal silico-aluminate of type 4A by hot mixing at least one source containing silica and alumina with an alkali-metal hydroxide and water, one at least of the reactants being supplied in solid form, and at least partial crystallisation occurring simultaneously with the mixing step, characterised in that the reactants are mixed in proportions such that the initial medium is of the following composition, expressed in molar ratios : SiO2 /Al2 O3 from 1.5 to 2.5 Na2 O/SiO2 from 0.8 to 1.20 H2 O/Na2 O from 7 to 15 and takes on the appearance of a solid mixture, and then said solid mixture is left to develop until it re-disperses in the form of a suspension of silico-aluminate, which is filtered, washed and dried.