C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/86 (2006.01) B01D 9/02 (2006.01) C01D 7/00 (2006.01) C25D 21/18 (2006.01)
Patent
CA 2087046
ABSTRACT Carbonates, and particularly sodium carbonate, are removed from cyanide containing plating baths by taking from said cyan- ide 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. Pre- ferably, 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 cry- stallization, starts, and thereafter the mixture is still held for 2 to 4 minutes at 0.5 °C to 1 °C below this starting tem- perature. The method is useful for all kinds of cyanide con- taining baths and provides essential technical, ecological and economical advantages.
Barrigar & Moss
Leutwyler Rene
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