Definition of Cyanide electrolytic process tank


Cyanide electrolytic process tank means an electrolytic process tank used for cyanide electrolytic processes. "Cyanide electrolytic process" means an electrolytic process that uses cyanide as a major bath ingredient, that operates at pH of 12 or more, and that uses or emits any of the plating and polishing metal HAPs. The cyanide in the bath works to dissolve the metal HAP added as a cyanide compound (e.g., cadmium cyanide) and creates free cyanide in solution, which helps to corrode the anode. These tanks are self-regulating to a pH of 12 due to the caustic nature of the cyanide bath chemistry. The cyanide in the bath is a major bath constituent and not an additive; however, the self-regulating chemistry of the bath causes the bath to act as if wetting agents/fume suppressants are being used and to ensure an optimum electroplating process. All cyanide electroplating baths at pH greater than or equal to 12 have cyanide-metal complexes in solution. The metal HAP to be plated is not emitted because it is either bound in the metal-cyanide complex or reduced at the cathode to elemental metal, and plated onto the immersed parts. Cyanide baths are not intentionally operated at pH less 12 since unfavorable electroplating conditions would occur in the tank. "Deviation" means any instance in which an affected source or an owner or operator of an affected source: * "Fails to meet any requirement or obligation established in 10.0 of this regulation including, but not limited to, any equipment standard (including emission and operating limit), man- agement practice, or operation and maintenance requirement; * "Fails to meet any term or condition that is adopted to implement an applicable require- ment in 10.0 of this regulation and that is included in the operating permit for any affected source required to obtain such a permit; or * "Fails to meet any equipment standard (including emission and operating limit), manage- ment practice, or operation and maintenance requirement in 10.0 of this regulation during startup, shutdown, or malfunction.
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