Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Reexamination Certificate
2011-07-12
2011-07-12
Silverman, Stanley (Department: 1736)
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
C423S111000, C423S127000
Reexamination Certificate
active
07976820
ABSTRACT:
An improved method and composition for producing aluminum hydroxide crystals in a Bayer process pregnant liquor, involve the addition of an emulsified 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 viable product in the presence and absence of a hydrocarbon oil which dissolves the fatty acid. Further, the modifier, prepared in either an emulsified form or as a fatty acid neat, facilitates formation of oxalate aggregates greater than 200 μm which may be readily screened out with minimum trihydrate loss.
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Counter James A
Kouznetsov Dmitri L
Liu Jianjun
Slinkman David H
Bishop Joshua D.
Fiorito James A
Martin Michael B.
Nalco Company
Silverman Stanley
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