Liquid purification or separation – Constituent mixture variation responsive
Patent
1988-09-19
1990-10-02
Wyse, Tom
Liquid purification or separation
Constituent mixture variation responsive
210178, 210196, 210202, 210266, B01D 3604
Patent
active
049605119
ABSTRACT:
A process is disclosed for removing heavy metals, dissolved aluminum, sulfides and organic compounds from a caustic etch solution, thereby regenerating the etching power of the solution or facilitating its disposal into the environment. The process consists of forming a first filtrate from which heavy metals present in the solution have been removed, and a second filtrate obtained by precipitating and oxidizing residual chemicals remaining in the first filtrate. The latter is done over a selected pH and temperature range. The second filtrate is then either reclaimed back to the etching tank, or subjected to ozonization prior to disposing of it into the environment.
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Doble Florimel
Gallego Jose M.
Jaffari Cyrus
Steidl El
Caspian International, Inc.
Wyse Tom
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