| 摘要 |
Detoxicating of solutions containing free as well as complex heavy metal cyanides takes place in aerated active C column for catalytic cyanide oxidation coupled with ion exchange installation consisting of at least one strongly acid cation exchanger and a weakly basic anion exchanger. Pref. C column is coupled on outlet side of weakly basic ion exchanger. On strongly acid cation exchange, heavy metal cyanide complexes are decomposed to HCN and difficultly soluble heavy metal cyanide precipitates. HCN is not bonded by weakly basic exchanger, so it passes into waste water thereof and is oxidised on C. Oxidation products, passing into recycle water, are cyanate and NH3. |
