Process for the production of a low soda content smelting...

Details Process for the production of a low soda content smelting... Process for the production of a low soda content smelting...

C - Chemistry, Metallurgy

01

F

C01F 7/46 (2006.01) C01F 7/44 (2006.01)

Patent

CA 2160050

A process for the production of a low soda-content smelting grade alumina from alumina trihydrate, wherein the process comprises the steps of: (a) calcining alumina trihydrate at a temperature between 700°C and 1200°C to produce alumina; (b) leaching the alumina in an aqueous slurry to which carbon dioxide is added, the leaching occurring at a temperature less than 80°C; (c) washing the leached alumina slurry and separating the washed alumina therefrom; and (d) heating the washed alumina slurry at a temperature between 300°C and 1100°C to produce a smelting grade alumina with a low soda content.

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