ISSN 2594-5327
56º Congresso anual — Vol. 56 , num. 1 (2001)
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The application of macroporous strong base resins to cyanide recovery from synthetic solutions containing ferrous cyanide, nickel cyanide and high levels of copper cyanide is discussed. Adsorption experiments show that strong base resins readily extract metal cyanocomplexes, in a sequence of affinity given by Ni>Cu>Fe, for polystyrene resins, and by Cu>Ni>Fe, with polyacrylic resins. The presence of ethyl ammonium quaternary groups results in a remarkable low iron uptake. Thiourea is able to elute all the three metal cyanocomplexes owing to the increased solubility of copper cyanocomplexes in the presence of this complexing agent. Saline solutions are effective only with polyacrylic resins (Purolite A860S), failing to desorb the metals, specially the nickel cyanocomplex, loaded on polystyrene-based resins. The results demonstrate that a universal eluant is not available and the selection of the most appropriate resin-elution procedure should be based on the specific features of the system under consideration.
The application of macroporous strong base resins to cyanide recovery from synthetic solutions containing ferrous cyanide, nickel cyanide and high levels of copper cyanide is discussed. Adsorption experiments show that strong base resins readily extract metal cyanocomplexes, in a sequence of affinity given by Ni>Cu>Fe, for polystyrene resins, and by Cu>Ni>Fe, with polyacrylic resins. The presence of ethyl ammonium quaternary groups results in a remarkable low iron uptake. Thiourea is able to elute all the three metal cyanocomplexes owing to the increased solubility of copper cyanocomplexes in the presence of this complexing agent. Saline solutions are effective only with polyacrylic resins (Purolite A860S), failing to desorb the metals, specially the nickel cyanocomplex, loaded on polystyrene-based resins. The results demonstrate that a universal eluant is not available and the selection of the most appropriate resin-elution procedure should be based on the specific features of the system under consideration.
Palavras-chave
ion exchange resins, cyanide recovery, metal cyanocomplexes, adsorption, elution
ion exchange resins, cyanide recovery, metal cyanocomplexes, adsorption, elution
Como citar
Albis, Leão, Versiane; Teixeira, Ciminelli, Virginia Sampaio.
APPLICATION OF ION EXCHANGE RESINS TO CYANIDE RECOVERY,
p. 1443-1452.
In: 56º Congresso anual,
Belo Horizonte, Brasil,
2001.
ISSN: 2594-5327, DOI 10.5151/2594-5327-C01223
