Composition and method for improved aluminum hydroxide...

Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing

Reexamination Certificate

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C423S111000, C423S127000

Reexamination Certificate

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07955589

ABSTRACT:
An improved method and composition for producing aluminum hydroxide crystals in a Bayer process pregnant liquor, involve the addition of a crystallization modifier comprising a C8-C10fatty acid, precursors, salts or blends thereof. The alkyl chain of the fatty acid crystallization modifier is free of functional groups. The modifier yields a commercially in the presence and absence of an hydrocarbon oil which dissolves the fatty acid.

REFERENCES:
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patent: 5312603 (1994-05-01), Hachgenei et al.
patent: 5607598 (1997-03-01), Williams
patent: 6168767 (2001-01-01), Welton et al.
patent: 6293973 (2001-09-01), Farquharson et al.
patent: 6599489 (2003-07-01), Mahoney et al.

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