Method for the production of aluminium hydroxide from bauxite

Abstract

A method for the production of aluminium hydroxide (Al(OH)3) is described wherein in a first tank a first aqueous solution of sodium aluminate (NaAl(OH)4) is provided and carbon dioxide (CO2) gas is added to the first tank to form a first aluminium hydroxide precipitate, and wherein a second tank containing a second aqueous solution of sodium aluminate is provided, wherein the sodium aluminate solution in the second tank is supersaturated and seed crystals are added to the second tank to form a second aluminium hydroxide precipitate. At least a fraction of the first aluminium hydroxide precipitate obtained from the first solution in the first tank is seeded into the second tank and/or at least a fraction of the second aluminium hydroxide precipitate obtained from the second solution in the second tank is seeded into the first tank.

Dependencies are inferred from the claim text.