METHOD FOR NEUTRALISATION AGAINST RESIDUAL CYANIDE OF LIQUID PHASE OF TAIL PULPS AFTER SORPTION OF NONFERROUS METALS Russian patent published in 2008 - IPC C22B3/20 C22B11/00 C02F1/58 

FIELD: metallurgy.

SUBSTANCE: method of neutralisation against residual cyanide of liquid phase of tail pulps after sorption of nonferrous metals includes cyanide deposition by reactant in the form of insoluble complex compound. At that in the capacity of reactant it is used pulp filtrate from the process of biooxidation of sulphide gold-bearing concentrate, containing sulfuric acid and ferric iron sulfate. At deposition reactant is used in ratio not less than 10 l of pulp filtrate per 1 m³ of each liquid phase of tail pulps, at finite pH of deposition 6.5-7.5 and time not less than 1 hour.

EFFECT: effective usage at enterprises of non-ferrous metallurgy for treatment of tail pulp of gold-extracting mill from residual cyanide.

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