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US 9,630,855 B2Granted
Alternative additives to enhance slurry dewatering
AssigneeEcolab USA Inc.
InventorCarl Nicholas Urbani
Life of this patent
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Abstract
The invention provides methods and compositions for improving dewatering of Bayer Process alumina trihydrate slurry. The method comprises adding an R-Succinic Compound (such as octadecenyl succinic acid, hexadecenyl succinic acid, and/or dodecenyl succinic acid) to the slurry. The R-Succinic Compound removes water that would otherwise be trapped within the filtered slurry cake and therefore reduces the energy needed to calcine the resulting solids.
Claims15
A method comprising:
- adding a wash fluid to an alumina trihydrate bearing slurry comprising alumina trihydrate and caustic-soluble aluminate liquor;
- adding to the alumina trihydrate bearing slurry or to the wash fluid a composition comprising at least one R-succinic compound having a structure selected from formula (I) or formula (II), a conjugate acid-base of the R-succinic compound having a structure selected from formula (I) or formula (II), and combinations thereof;
- wherein formula (I) is
- and formula (II) is
- and
- wherein R and R′ are independent, distinct, and represent alkyl, alkenyl, or aromatic hydrocarbon groups containing 1-30 carbon atoms.
3 more elements
Dependencies are inferred from the claim text.