Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Patent
1975-12-22
1977-03-29
Carter, Herbert T.
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
423121, 423127, C01F 714
Patent
active
040149854
ABSTRACT:
Aluminum oxide having a sodium oxide content after calcination of less than 0.1% by weight is continuously precipitated as aluminum hydroxide from a Bayer process liquor by a controlled slow precipitation. The controlled, slow precipitation rate required to create a low soda product is achieved by controlling the residence time of liquor in the precipitation vessel so as to provide a constant, low ratio of aluminum oxide to sodium oxide. Residence time control in a Bayer process plant is achieved by controlling green liquor flow rate to the tank, or by sizing the tank for a constant flow. The use of heavy seed charges to increase the seed surface area permits the production of a low soda product at a faster precipitation rate.
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Haleen Leonard W.
Pearson Alan
Aluminum Company of America
Carter Herbert T.
Taylor John P.
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