Treatment of electroless nickel plating baths

Details Treatment of electroless nickel plating baths Treatment of electroless nickel plating baths

1988-02-22

1988-12-06

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

204DIG13, 210724, 210726, 210906, 210912, 423140, 423305, C02F 172

Patent

active

047894849

ABSTRACT:
A process for removing nickel and phosphorus species from a spent electroless nickel plating solution is described. This process involves an initial precipitation of phosphite values from the plating solution, followed by oxidation of hypophosphite and remaining phosphite to phosphate values, and the final removal of phosphate and nickel by lime precipitation. The treated plating solution is then separated from the precipitants, such as by filtration, and preferbly contain less than 1 milligrams/liter of nickel and/or total phosphorus species. This process is a cost effective method for treating spent electroless nickel plating solutions which is readily adaptable for on-site use.

REFERENCES:
patent: 3770630 (1973-11-01), Kamperman
patent: 4009101 (1977-02-01), Hayashi
patent: 4265866 (1981-05-01), Arzoumanidis et al.
patent: 4332687 (1982-06-01), Daignault et al.
patent: 4380531 (1983-04-01), Wisnouskas et al.

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