Process for depleted chemical milling solutions

Details Process for depleted chemical milling solutions Process for depleted chemical milling solutions

1986-11-03

1989-05-02

Wyse, Tom

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210722, 210724, 210726, 210760, 210912, 210913, 156642, C02F 162

Patent

active

048266051

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.

REFERENCES:
patent: 3539468 (1970-11-01), Wright
patent: 3973987 (1976-08-01), Hewitt et al.
patent: 4289594 (1981-09-01), Alpaugh et al.
patent: 4372805 (1983-02-01), Takahashi et al.
"Environmental Pollution Control Alternatives: Economics of Wastewater Treatment Alternatives for the Electroplating Industry" EPA 625/5-79-016, Jun. 1979, pp. 8-10.
Graham, K. A. "Electroplating Engineering Handbook" 3rd ed., 1976, pp. 778-780.

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