Process of regenerating an ammoniacal etching solution

US4252621A · kind A · utility

Assignee

• MX Processer Reinhardt & Co. AB · SE

Inventors

• Hans Reinhardt · Bretten, DE
• Harald D. Ottertun · Mölndal, SE

Key dates

• Filing date: Apr 10, 1979
• Grant date: Feb 24, 1981
• Expiry date: Apr 10, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process is described for regenerating a spent ammoniacal etching solution containing copper values. The process comprises extracting copper from the spent etching solution by means of an organic solution containing a reagent which is capable of selectively extracting copper ions from the spent etching solution. The process also comprises extracting copper from the washing water originating from the etching process.