Recovery of sodium hydroxide and aluminum hydroxide from etching

Details Recovery of sodium hydroxide and aluminum hydroxide from etching Recovery of sodium hydroxide and aluminum hydroxide from etching

1990-07-06

1991-09-17

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156665, 156345, B44C 122, C23F 100, C03C 1500, C03C 2506

Patent

active

050492330

ABSTRACT:
A method for the recovery and recycling of sodium hydroxide from the waste solution of aluminum etching operations. The method utilizes a dialysis membrane column or stack to initially remove sodium hydroxide from the waste solution and return it to the etch tank base solution sufficiently concentrated to carry on the basic etching operation. The method permits the recovery of salable quantities of aluminum hydroxide.

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patent: 4826605 (1989-05-01), Doble et al.
patent: 4857200 (1989-08-01), Kelham

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