FIELD: chemistry.
SUBSTANCE: invention relates to a method of reclaiming cyanide from aqueous solutions, particularly recycled water which contains thiocyanates CNS-. The method involves electrochemical oxidation of thiocyanates. Before electrochemical oxidation, recycled water, which contains from 2 to 20 g/l thiocyanates, is acidified to pH=2-3. Electrochemical oxidation is carried out at current density of not less than 750 A/m2 for 2 to 3 hours while simultaneously letting in air into the solution. The formed hydrogen cyanide is trapped in an absorption vessel with its output ranging from 70 to 80%.
EFFECT: reduced content of thiocyanates in recycled water with simultaneous reclamation of cyanide.
3 dwg, 1 ex
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