Patent ID: 6048507
Filing Date: 2000-04-11
Classification: C01D,C22B,Y02P

Abstract:
A method of producing high purity lithium carbonate, comprising the steps of:reacting impure Li.sub.2 CO.sub.3 in a first aqueous solution with CO.sub.2 to form a second aqueous solution containing dissolved LiHCO.sub.3, dissolved compounds and insoluble compounds, wherein said dissolved compounds and said insoluble compounds include inpurities from said impure Li.sub.2 CO.sub.3 ;separating unreacted CO.sub.2 and said insoluble compounds from said second aqueous solution;separating said dissolved impurities from said second aqueous solution by contacting with an ion selective medium to remove said dissolved impurities including divalent and trivalent ions; andprecipitating Li.sub.2 CO.sub.3 from said second aqueous solution.