Ion exchange and chlorine dioxide oxidation are the methods tested for cyanide removal [95,101]. Photo-oxidation of cyanide has also been studied as a promising process. Photosensitized cyanide oxidation over TiO2 and TiO2/ZnO and direct photo-oxidation using TiO2 have been tested with high efficiencies [102-104].
Alkaline hydrolysis is another cyanide destruction method and it does not involve the use of chemicals other than caustic. pH is adjusted to 9.0-10.0 and temperature is increased to 165-185°C at a pressure of 6.3-7.0 kg/cm2. Reaction time is about 1.5 hours .
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