PROCESS FOR PRODUCING KALSILITE, POTASSIUM SULPHATE, ALUMINIUM SILICATE AND CALCIUM SILICATE HYDRATE

摘要

The present patent application describes a process for producing kalsilite from powdered potassium feldspar previously calcined to 1000°C for one hour and dissolved in KOH solution at a concentration ranging from 30 to 37% by weight, in stoichiometric quantity, at a temperature ranging from 200°C to 240°C, preferably 240°C, for a period of 1 to 3 hours, preferably 3 hours, under stirring at 130 to 200 rpm, preferably 180 rpm, and under operating pressure of 15 bar. A process for producing aluminium silicate and potassium sulphate and a process for producing calcium silicate hydrate are also described.