FIELD: regeneration of free cyanide in waste technological solutions containing cyanides and heavy metals; non-ferrous metallurgical plants; gold mining and galvanic processes.
SUBSTANCE: proposed method consists in treatment of waste technological solutions by mineral acid under conditions excluding formation of gaseous hydrocyanic acid followed by separation of phases: solution of hydrocyanic acid and difficultly soluble compounds of elementary cyanides of metals by settling and/or filtration, leaching of clarified solution and re-use of solution of free cyanide thus obtained. Regeneration of free cyanide is carried out directly in solution being treated without conversion of hydrocyanic acid into gaseous phase.
EFFECT: repeated use of cyanide; reduced consumption of cyanide and fresh water; facilitated procedure; extraction of non-ferrous metals from solution in form of compact concentrate.
1 dwg, 2 ex
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