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US 8,524,192 B2Granted
Aluminum hydroxide gel particle and production method thereof
AssigneeKyowa Chemical Industry Co., Ltd.
InventorsTakafumi Suzuki, Shinjiro Tamagawa
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Abstract
An aluminum hydroxide gel particle having high purity and extremely high acid reactivity and a production method thereof. The aluminum hydroxide gel particle has an iron (Fe) content of 1 to 10 ppm.
Claims11
A method of producing an aluminum hydroxide gel particle, comprising the steps of:
- (1) adding a chelating agent to a soluble aluminum salt aqueous solution to obtain a soluble aluminum salt aqueous solution containing a complex;
- (2) reacting an aqueous solution of an alkali metal carbonate or an ammonium carbonate with the soluble aluminum salt aqueous solution containing the complex in a molar ratio (CO3/Al2O3) of the carbonate ion contained in the carbonate to aluminum oxide contained in the soluble aluminum salt of 3.0 to 4.5 at a temperature of 10 to 40° C. to obtain a reaction product;
- (3) carrying out solid-liquid separation of the reaction product to obtain a cake;
- (4) bringing the cake into contact with an aqueous solution of at least one ion exchange agent selected from the group consisting of an inorganic acid and a water-soluble aluminum salt to obtain an ion-exchanged cake;
- and
- (5) drying the ion-exchanged cake.
3 more elements
Dependencies are inferred from the claim text.