| 摘要 |
In a process of removing ferricyanide ions and/or ferrocyanide ions from a waste solution or water containing these ions formed in photographic processings by bringing the waste solution in contact with a weakly-basic anion-exchange resin to absorb the ferricyanide ions and/or ferrocyanide ions on the anion-exchange resin, an alkaline concentrate of the ferricyanide ions and/or ferrocyanide ions is formed by immersing the weakly-basic anion-exchange resin having absorbed thereon the ions and after adding to the concentrate a strong alkali, a hypochlorite, and bromide ions to increase the pH of the concentrate to above 12, the mixture is heated to temperatures over 50 DEG C at normal pressure, whereby the ferricyanide ion and/or ferrocyanide ions are decomposed.
|
