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* Reference 10.

* Reference 10.

Evaporation has proved to be a successful recovery method for plating baths containing chromium, nickel, cadmium cyanide, Zinc cyanide/chloride, copper cyanide, and silver.

Performance Data-

Advance Plating Company of Cleveland, Ohio, has conducted a demonstration for evaporative recovery. The system studied was the chrome-plating operation, which included a Udylite Sidearm 350 two-lane machine with several cleaning stations, and a chrome-plating tank with rinses (as shown in Figure 23). The system has four rinse tanks. The first two rinses are air-agitated and in counterflow; the third rinse has a spray system, is continuously circulated, and is in counterflow; and the fourth tank is a still rinse that is refilled daily with fresh water. Concentrations of metal impurities are kept at a minimum through the use of an industrial-filter, rubber-lined, cation exchanger on the rinse feed tank. The first rinse tank is directly connected to the rinse feed tank. The rinse water containing the dragged-out plating solution flows from the first rinse tank to a two-chambered rinse feed tank. The dilute chrome rinse is pumped from one rinse feed tank chamber into the cation exchanger. From the cation exchanger, the rinse water flows to the second rinse feed tank chamber. Clean rinse water from the cation exchanger is fed upon demand to the evaporator by use of a level controller. The evaporator used was a Corning PCR-60 plating chemical recovery unit manufactured by Corning Glass Works, A liquid-ring vacuum pump was used to prodiKi rio* 40*1 üf*q ott(

Figure 22, Qpen-loop evaporative recovery system. Source: G, C, Cushnie, Jr.t 1985 (Ref. 10)

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