Cyanide-plating baths

Examples of plating solutions having good throwing power include cyanide plating baths such as copper, zinc, cadmium, silver, and gold, and noncyanide alkaline zinc baths. Examples of poorer throwing power baths are acid baths such as copper, nickel, zinc, and hexavalent chromium. [Pg.146]

Numerous practices have been developed to eliminate or minimize discharges of pollutants from the metal finishing industry. Successful source reduction measures have been implemented to eliminate cyanide plating baths, as well as substitute more toxic solvents with less toxic cleaners. [Pg.17]

Fieavy copper cyanide plating bath Copper sulfate... [Pg.359]

Spent cyanide plating bath solutions from electroplating operations, waste halogenated... [Pg.158]

While cathodic processes may produce positive payoffs by recovering metals from waste streams, anodic processes are essentially destructive in nature. Positive payoffs may occur if it is possible to carry out an anodic process which destroys toxic species at the same time that the cathode is recovering metals. For example, during the treatment of a cyanide plating bath, heavy metals are recovered at the cathode while cyanide is destroyed at the anode along with any organic additives and brighteners. [Pg.372]

Zin-O-Lyte [Du Pont]. TM for a series of electroplating products for use in zinc cyanide plating baths. [Pg.1350]

Spent cyanide plating bath solutions from electroplating operations (except (R,T) for precious metals electroplating spent cyanide plating bath solutions). [Pg.107]

Phosphates are included in the composition of some cyanide plating baths for other metals, for example ... [Pg.1072]

Roll cell. These are sandwich constructions consisting of a packed stainless steel or titanium mesh cathode, separator and a screen anode rolled up like a swiss roll. These cells can operate with fluid velocities of 1-10 cm s and with apparent current densities of 10-200 mA cm at the separator. This type of cell is a concentrator device for metal ions, the metal is recovered from the cell by leaching or by anodic dissolution. An economic analysis [23] showed that waste water treatment with this cell is highly competitive with ion-exchange technology. Typical applications for metal ion removal are recovery of copper and Hg from waste stream recovery of Ag from a used fixer solution down to a silver concentration of 0.1 ppm and the treatment of zinc cyanide plating bath rinse waters which contain the Zn(CN)5 complex ion. [Pg.371]

Cadmium Cyanide Plating Bath, (3% Cadmium Oxide 10% Sodium Cyanide 1.2% Sodium... [Pg.186]

Copper Cyanide Plating Bath, (10.5% Copper and 14% lum Cyanides 6% Rochelle Salts) ... [Pg.189]

The metal finishing industiy commonly uses alkaline cyanide plating baths to deposit copper and other heavy metals. The cyanides are extremely toxic to aquatic life and must be removed from the waste rinse water prior to discharge into waterways. Also, it is increasingly getting more attractive to recover the plating rinse solutions for reuse. [Pg.185]

Formaldehyde is also claimed to be of aiue for the purification of zinc cyanide plating baths. ... [Pg.346]

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