C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
23/241
C01F 7/04 (2006.01) C01F 7/06 (2006.01) C01F 7/47 (2006.01)
Patent
CA 2002172
17 ABSTRACT OF THE DISCLOSURE A process for lowering the concentration of organic carbon substances in a caustic aluminate liquor of the Bayer process for the production of alumina from bauxite. The method comprises thermally treating bauxite prior to dissolution in the caustic aluminate liquor to destroy a portion of the organic content, with the thermal treatment substantially removing that part of the organic carbon content responsible for the formation of sodium oxalate. During the treatment, any gibbsite (aluminum trihydroxide) present in the bauxite is converted to a form which has a higher solubility in caustic aluminate liquor than gibbsite. In addition, the iron oxides present convert to a more readily settleable form, improving the overall processability of the bauxite. Utilizing this process allows bauxites with widely varying amounts of organic carbon to be accommodated in the Bayer process without affecting processability or plant operations.
Brown Neil
Robic Robic & Associes/associates
Vereinigte Aluminum-Werke Aktiengesellschaft
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