Method to prevent the exhaustion of acid copper plating baths an

Details Method to prevent the exhaustion of acid copper plating baths an Method to prevent the exhaustion of acid copper plating baths an

1994-07-22

1997-02-04

McCarthy, Neil

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210712, 210912, 204DIG13, 423146, 4231503, C02F 162

Patent

active

055994580

ABSTRACT:
Method to prevent the exhaustion of acid copper plating baths (12) and to treat sewage or sludges (20) containing copper in an ionic form so as to recover metallic copper (39), the method including the addition (11) of a compound which keeps the concentration of iron below a critical value (for instance, 60 grs/lt. ), the compound causing precipitation of iron in the form of ferrous sulphate and thus preventing the co-deposition of crystals of ferrous sulphate and copper sulphate with a possible incorporation of organic impurities such as stearates (35) present in the acid copper plating baths (12).

REFERENCES:
patent: 2754174 (1956-07-01), Roberts
patent: 4176160 (1979-11-01), Pavonet
patent: 4324629 (1982-04-01), Oka et al.
patent: 4549946 (1985-10-01), Horn
patent: 4559216 (1985-12-01), Nagai et al.
patent: 4600493 (1986-07-01), Korngold
patent: 5266212 (1993-11-01), Szotek

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