PROCESS FOR THE CONTINUOUS PRODUCTION OF A WATER, ALKALINE SUSPENSION, SODIUM SILICATES, CRYSTALLINE ALUMINUM, ZEOLYTIC, POOR IN 'GRIT', FINISIMALLY DIVIDED

摘要

In a process for the production of an aqueous alkaline suspension of low-grit, crystallized zeolitic sodium aluminosilicate of the smallest particle size having the composition 0.9 to 1.1 Na2O. 1 Al2O3 . 1.8 to 2.5 SiO2 with a water content depending on the degree of drying, which contains at least 99.8% by weight of a particle size of less than 25 mu m and has a high cation exchange capability, comprising crystallization of an aqueous alkaline suspension of an x-ray-amorphous sodium aluminosilicate, said suspension having a composition corresponding of the molar ratios of 1.5 to 5 Na2O:1 Al2O3:1 to 4 SiO2:40 to 400 H2O, at elevated temperatures and recovering crystallized zeolitic sodium aluminosilicate, the improvement consisting of feeding the suspension of the x-ray-amorphous sodium aluminosilicate continuously into a crystallizing reactor having progressively, separately zoned mixing areas with a stage-like effect and having at least 20 stages, wherein the suspension flows first through at least 8 stages in the intake part of the reactor, which intake part of the reactor may comprise up to one third of the total reactor volume, maintaining said suspension in the reactor at a preselected temperature in the range of from 80 DEG to 100 DEG C. until the degree of crystallization of the zeolitic sodium aluminosilicate, determined by x-ray, has reached at least 80% of the theoretically possible crystallinity. and continuously removing the suspension from the end opposite of the intake end of the reactor.