Patent ID: 6334990
Filing Date: 2002-01-01
Classification: C01D,Y02P

Abstract:
A method for forming potassium sulfate from potash brines, comprising the steps of:providing a source of sodium chloride and potassium chloride in a first step; reacting said sodium chloride and potassium chloride with calcium sulfate and sodium sulfate to form a syngenite precipitate and a first filtrate; treating said syngenite precipitate with ammonium bicarbonate at between 60Â° C. and 100Â° C. to form calcium carbonate precipitate and a second filtrate; cooling said second filtrate to a temperature of between 0Â° C. and 40Â° C.; and treating said second filtrate with potassium chloride crystals to form potassium sulfate precipitate and a third filtrate.