Energy effective contaminant removal from closed loop recovery systems for cyanide based electroplating

Technical Report · Sun Mar 01 00:00:00 EST 1987

OSTI ID:6661577

Williamson, R C; Williamson, W R; Roy, C H

An ultra-low-temperature heat pump evaporator was developed to provide a feasible alternative to conventional chemical treatment and sludge disposal of heat sensitive cyanide based electroplating wastes. The evaporator system, trademarked Fridgevap, was successfully tested on a cadmium cyanide plating line, proving the feasibility of recovering and returning the plating solution to the bath. The purpose of the project reported here was to develop and test an auxiliary crystallizer to continuously precipitate sodium carbonate decahydrate (washing soda) contaminants, thereby enhancing the effectiveness of materials recovery. The combined evaporator and crystallizer system underwent limited testing on both a cadmium and a zinc cyanide plating line. This report describes and discusses the development and testing of the prototype closed loop recovery system and the patented heat exchanger which made the system possible. Included is a comparison with conventional chemical precipitation and sludge disposal.

• Research Organization: LI-CON, Inc., Pensacola, FL (USA)
• DOE Contract Number: AC07-83CE40629
• OSTI ID: 6661577
• Report Number(s): DOE/CE/40629-1; ON: DE87007962
• Resource Relation: Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CADMIUM
ELECTRODEPOSITION
ELECTROPLATING
MATERIALS RECOVERY
WASTE PROCESSING
ZINC
CRYSTALLIZATION
CYANIDES
EVAPORATORS
HEAT PUMPS
HYDRATES
SODIUM CARBONATES
WASTE WATER
WATER TREATMENT
ALKALI METAL COMPOUNDS
CARBON COMPOUNDS
CARBONATES
DEPOSITION
ELECTROLYSIS
ELEMENTS
HYDROGEN COMPOUNDS
LIQUID WASTES
LYSIS
MANAGEMENT
METALS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PLATING
PROCESSING
RECOVERY
SODIUM COMPOUNDS
SURFACE COATING
WASTE MANAGEMENT
WASTES
WATER
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management