Method of removing carbonates from plating baths

Details Method of removing carbonates from plating baths Method of removing carbonates from plating baths

1993-01-15

1994-12-27

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Treating process fluid by means other than agitation or...

205101, 210737, B01D 902, C25D 2118

Patent

active

053762568

ABSTRACT:
Carbonates, and particularly sodium carbonate, are removed from cyanide containing plating baths by taking from said cyanide containing bath at least part of its bath liquid; stirring and cooling in a cooling container the token liquid while in the metastabile state until crystallization of the carbonates occurs; separating the crystallized carbonates from the liquid; and leading the residual liquor back to the plating bath. Preferably, the quantity of bath liquid taken from the plating bath and the moment of this taking are chosen so as to bring the carbonate content of said plating bath, after leading the residual liquor back to it, to a carbonate content of 25 to 45 grams/liter, and the cooling is continued until the exothermic reaction, which is caused by the liberation of the heat of crystallization, starts, and thereafter the mixture is still held for 2 to 4 minutes at 0.5.degree. C. to 1.degree. C. below this starting temperature. The method is useful for all kinds of cyanide containing baths and provides essential technical, ecological and economical advantages.

REFERENCES:
patent: 2787590 (1957-04-01), Rinker
patent: 2861927 (1958-11-01), Ceresa et al.
patent: 3661734 (1972-05-01), Sloan
patent: 4049519 (1977-09-01), Sloan
patent: 4159194 (1979-06-01), Steward
patent: 4278515 (1981-07-01), Pearlstein et al.
patent: 4365481 (1982-12-01), Pearlstein et al.

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