Preparation of pure magnesian values

Details Preparation of pure magnesian values Preparation of pure magnesian values

C - Chemistry, Metallurgy

01

F

23/22

C01F 5/24 (2006.01) C01F 5/02 (2006.01)

Patent

CA 1162025

ABSTRACT OF THE DISCLOSURE A method is disclosed for recovering a magnesium carbonate of high purity from an aqueous magnesium hydroxide slurry. The slurry contains at least one percent of magnesium hydroxide and includes water, magnesium hydroxide, and impurities normally associated with magnesium hydroxide slurries. The method involves carbonating the slurry with sufficient carbon dioxide to dis- solve a substantial proportion of the magnesium hydroxide therein as magnesium bicarbonate, and continuing carbonation until a solution saturated with magnesium bicarbonate is formed. A portion of the magnesium bicarbonate is converted to a crystalline magnesium carbonate. Substantially all the dissolved calcium is precipitated so that the slurry contains dissolved magnesium bicarbonate, a crystalline magnesium carbonate precipitate and a calcium carbonate precipitate. The solids are then separated from the magnesium bicarbonate solution, the solution is decarbonated, for example by heat or vacuum, and hydrous magnesium carbonate is separated from the aqueous phase.

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