Abstract

LIMA H., Eddy R. et al. Study of the liquid effluents of cyanide complexes for industrial reuse using the jars method. Rev. Bol. Quim [online]. 2019, vol.36, n.1, pp.10-18. ISSN 0250-5460.

Abstract The present research work is of the analytical and experimental type for the destruction of effluent cyanides from the mining sector in La Libertad, Peru. The trials were monitored daily for a week. The characterization of the metallurgical effluent in terms of the cyanide content was 800 ppm. The solution treatment process was adapted to eliminate the cyanide complexes, as well as the process of the tailings solutions applying the "Jars Method". Said method makes use of hydrogen peroxide, ferric salts and the addition of an inorganic polymer (Flocculant). With the use of this technology it was possible to precipitate the cyanide complexes, then the filtered solution obtained was recirculated in countercurrent carbon columns to eliminate heavy metals present in the treated samples; the treated effluents can be reused at an industrial level with a low pollution profile and friendly environment. The 2^K experimental design was used to corroborate the study with 11 metallurgical tests were carried out using the Pitcher Method. The method allows to adapt the water treatment at the industrial level; allowing to evaluate at scale and quickly the action that exerts on the stage of clarification, considering as variables the speed of agitation and quantities of reagents dosed in the process. The solutions of effluents treated by the jars method, showed 0.8 ppm in content of cyanide complexes, acceptable rate for industrial recirculation.

Keywords : Cyanide; Ferric salts; Hydrogen peroxide.

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