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US 7,247,292 B2Granted
Aluminum hydroxide and production process thereof
AssigneeShowa Denko K.K.
InventorsAkira Onishi, Shirou Tomitsuka, Seisuke Takahashi
Life of this patent
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Abstract
A method for producing aluminum hydroxide includes a step of elevating a temperature of a slurry of aluminum hydroxide suspended in a sodium aluminate solution from 70° C. or lower to 85° C. or higher, and a step of applying a centrifugal force to the slurry. The aluminum hydroxide constituting the slurry is obtained beforehand through the Bayer's process.
Claims7
A method for producing aluminum hydroxide comprising:
- a step of elevating a temperature of a slurry having agglomerated secondary particles of aluminum hydroxide obtained through the Bayer's process suspended in a sodium aluminate solution from 70° C. or lower to 85° C. or higher within 15 minutes to disintegrate agglomerated secondary particles, and
- a step of applying a centrifugal force to the slurry to disintegrate agglomerated secondary particles by attrition between particles that are formed in a sediment having an elevated solid content.
A method for producing aluminum hydroxide comprising:
- elevating a temperature of a slurry having agglomerated secondary particles of aluminum hydroxide obtained through the Bayer's process suspended in a sodium aluminate solution from 70° C. or lower to 85° C. or higher within 15 minutes to disintegrate agglomerated secondary particles, and
- subsequently applying a centrifugal force to the slurry to disintegrate agglomerated secondary particles by attrition between particles that are formed in a sediment having an elevated solid content.
Dependencies are inferred from the claim text.