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Verfahren und Vorrichtung zur Aufarbeitung oder Regenerierung von Aetzbaedern

Regenerating aqueous etching baths containing metal ions - by feeding the baths into cathode chamber of electro dialysis cells, reducing non-used oxidant and metal ions, etc..
 
: Krumbholz, C.

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Frontpage ()

DE 1996-19646945 A: 19961113
DE 1996-19646945 A: 19961113
DE 19646945 A1: 19980514
C23F0001
Deutsch
Patent, Elektronische Publikation
Fraunhofer IGB ()

Abstract
Regenerating aqueous etching baths containing metal ions, consumed and optionally non-used oxidant and optionally further components comprises: (a) feeding the bath into the cathode chamber of one or more electrodialysis cells to which is applied a potential difference and whose anode chamber is separated from the cathode chamber by an anion exchange membrane; (b) cathodically reducing non-used oxidant and metal ions in the cathode chamber; (c) transferring anions from the cathode chamber via the exchange membrane by electrodialysis; (d) transferring the content of the cathode chamber enriched in metal ions into the anode chamber; and (e) anodically oxidising consumed oxidant in the anode chamber. The apparatus for carrying out the process is also claimed. USE - Used for regenerating pickling baths used in circuit plate manufacture. ADVANTAGE - A series of etching baths can be regenerated.

: http://publica.fraunhofer.de/dokumente/PX-38599.html