METHOD AND DEVICE FOR REGENERATIVE TREATMENT OF COPPER CYANIDE PLATING LIQUID

PURPOSE:To regenerate easily a copper cyanide plating liquid consisting essentially of K2Cu(CN)3, when harmful K2CO3 accumulates therein, by cooling the soln. to a specific temp. or below to deposit K2CO3 and filtering off the K2CO3. CONSTITUTION:K2CO3 as a harmful component increases with lapse of time and the concn. thereof increase in a copper cyanide plating liquid consisting essentially of K2Cu(CN)3 contg. 30-50g/l CuCN and 10-17g/l KCN during the use of said liquid. Such plating liquid is periodically or continuously supplied from a plating bath cell 1 to a cooling tank 3 for the plating liquid. A heat exchanger 3.1 which cools the liquid by the refrigerant from a refrigerator 6 is placed in the tank 3 to cool the plating liquid and to deposit K2CO3 is filtered off from the plating liquid deposited therein with the K2CO3 in a filter 4 and is removed in the form of sludge S. The plating liquid regenerated by having the decreased content of the K2CO3 is heated to a prescribed temp. in a heater 5 and is returned to the cell 1 for reuse.