CN-의 電氣化學的 分解 = Electrochemical Destruction of Cyanide Ion

다국어 초록 (Multilingual Abstract)

Indiscriminate disposal of the plating waste water into a sewer may result in the contamination of a river and the subsequent destruction of animal and plant life.
The object of this study is to destruct cyanide ion by electrolysis in the plating wastes.
The methods of cyanide disposal are many. Particularly, the electrolytic method of destroying cyanide solution presents to the plating wastes the following advantages over other methods:
1. Complete destruction of the cyanide without formation of other toxic material
2. Fitness in the cases of a high concentration of CN-.
3. Low opearating cost.
4. Reclamation of the metal is possible, important in the cases of more expensive metals
5. No sludge-disposal problem is created.
6. Low equipment cost-allows utilization of available equipment.
The materials tested for electrodes were Cu, Ni, C, Pb, Al and Stainless steel.
Cyanide is anodically oxidized to cyanate, then to carbon dioxide and nitrogen.
Anodic oxidation of cyanide ion has been carried out under various, conditions.
The results are summarized as follows:
1. For anodic oxidation cyanide ion, when both current density and temperature were higher, the rate of oxidation was also higher.
The optimal conditions for anodic current density, electrolysis temperature and time were found to be 50℃, 4A/d㎡ and 3 hr.
2. Rate of decomposition increases with an decrease ofpH.
The optimum condition of pHwas 8.
3. The optiomum condition in electrode distance was assumed to be 3 cm.
4. Carbon electrode was the best as the anode.