Process for the purification of aluminum hydroxide and process f

Details Process for the purification of aluminum hydroxide and process f Process for the purification of aluminum hydroxide and process f

1996-10-31

1999-11-16

Nguyen, Ngoc-Yen

Etching a substrate: processes

Nongaseous phase etching of substrate

Recycling, regenerating, or rejunevating etchant

423629, 23301, 23305A, 156 6421, B44C 122, C01F 734

Patent

active

059851651

ABSTRACT:
The present invention allows the reproduction of a crystalline aluminum hydroxide having a high particle strength and a high purity which can find wide application such as abrasive from a supersaturated sodium aluminate solution which is being recycled in the production of aluminum hydroxide or lithographic printing plate. In a process for the purification of aluminum hydroxide which comprises the hydrolysis reaction of a supersaturated solution of sodium aluminate to crystallize aluminum hydroxide, the improvement which comprises the steps of keeping the temperature of a suspension formed by mixing a mother liquor having a total caustic soda concentration of from 50 to 700 g/l and an aluminum concentration or from 0 to 300 g/l with crystalline aluminum hydroxide at a range of from 10.degree. C. to 200.degree. C. for at least 1 to 48 hours, mixing the suspension with the supersaturated solution of sodium aluminate, and then causing the crystallization reaction at the crystallization reaction temperature.

REFERENCES:
patent: 2935376 (1960-05-01), Roberts, Jr.
patent: 4574001 (1986-03-01), Bielfedt et al.
patent: 4895627 (1990-01-01), Uesugi et al.
patent: 5163973 (1992-11-01), Ellis
patent: 5690700 (1997-11-01), Hiralal
Translation of JP 5-279,020 ( Oct. 1993.

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