Patent ID: 6528028
Filing Date: 2003-03-04
Classification: C01F

Abstract:
A process for treating bauxite comprisinga) a step of mixing bauxite and an aqueous alkali solution to form a first mixture comprising a first insoluble residue and a first aqueous solution and separating the first mixture into the first insoluble residue and the first aqueous solution, wherein said mixing of bauxite and said aqueous alkali solution is conducted at a temperature of 105Â° C. to 140Â° C. for a time of 1 minute to 40 minutes and said alkali aqueous solution has a concentration of Na2O in a range of 100 g/l to 150 g/l; b) a step of adding seeds into said first aqueous solution to precipitate sodium aluminosilicate and separating said precipitated sodium aluminosilicate from a remaining solution of said first aqueous solution; and c) a step of adding and mixing said separated sodium aluminosilicate with a calcium compound to form a second mixture, calcining the second mixture to form a calcined product, washing the calcined product with water, followed by filtering to obtain a second insoluble residue and a second aqueous solution.