Method for treating a surface of an aluminum substrate for a pri

Details Method for treating a surface of an aluminum substrate for a pri Method for treating a surface of an aluminum substrate for a pri

1992-02-12

1994-01-04

Dang, Thi

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156665, 156345, 210711, 210724, 210737, C23D 100

Patent

active

052756912

ABSTRACT:
A method and apparatus for treating a surface of an aluminum substrate for a printing plate includes treating the substrate surface with a treatment liquid being circulated, separating and discharging aluminum ions from a portion of the treatment liquid, recovering a sodium hydroxide solution from the treatment liquid, mixing the recovered sodium hydroxide solution with the treatment liquid being circulated, and maintaining a predetermined concentration of aluminum ions in the treatment liquid to be used. A portion of the treatment liquid containing sodium aluminate solution is mixed with aluminum slag containing an amorphous aluminum hydroxide produced at the time of neutralization of a waste acid and a waste alkali produced during surface treatment to thereby supersaturate the sodium aluminate solution, crystallize the aluminum hydroxide, and recover the sodium hydroxide solution to be returned to a liquid control tank to maintain a predetermined concentration of aluminum ions in the treatment liquid. Further, the characteristics of the aluminum slag are changed to be usable as an industrially available aluminum hydroxide. Still further, a hydrolytic reaction is caused in a separated part of the treatment liquid. Preferably, the supersaturated aluminate solution is passed through a filter, so that aluminum hydroxide is crystallized from the sodium aluminate solution, and the sodium hydroxide solution is recovered.

REFERENCES:
patent: 3890226 (1975-06-01), Hanami et al.
patent: 3909405 (1975-09-01), Aoyama
patent: 4136026 (1979-01-01), Meyer et al.
patent: 4372805 (1983-02-01), Takahashi et al.
patent: 4826605 (1989-05-01), Doble et al.
patent: 5049233 (1991-09-01), Davis

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