Recovery of gold from solutions with ammonia and thiosulfate using activated carbon

Authors

  • C. Vargas Departamento de Ingeniería Metalúrgica, Universidad de Santiago de Chile
  • P. Navarro Departamento de Ingeniería Metalúrgica, Universidad de Santiago de Chile
  • E. Araya Departamento de Ingeniería Metalúrgica, Universidad de Santiago de Chile
  • F. Pavez Departamento de Ingeniería Metalúrgica, Universidad de Santiago de Chile
  • F. J. Alguacil Centro Nacional de Investigaciones Metalúrgicas (CSIC)

DOI:

https://doi.org/10.3989/revmetalm.2006.v42.i3.22

Keywords:

Adsorption, Elution, Gold, Activated carbon, Thiosulfate, Ammonia

Abstract


The recovery of gold from solutions containing thiosulfate and ammonia using granular activated carbon was studied, evaluating the adsorption and elution stages. The influence of ammonia and thiosulfate concentration and the presence of impurities such as copper and zinc were also evaluated. In the presence of ammonia there was a concentration which maximized the adsorption of gold, while thiosulfate and impurities presence was harmful for the adsorption of gold. During elution, ammonia and thiosulfate concentration, pH regulator and temperature were evaluated. Ammonia favored the process as long as thiosulfate showed a maximum starting from which the elution diminishes. The effect of the pH regulator was very important; If was revealed that when the pH was regulated with caustic ammonia, a synergic effect appeared which favored the elution. Temperature favored the elution process, with activation energy of 9.13 kJ/mol.

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References

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Published

2006-06-30

How to Cite

Vargas, C., Navarro, P., Araya, E., Pavez, F., & Alguacil, F. J. (2006). Recovery of gold from solutions with ammonia and thiosulfate using activated carbon. Revista De Metalurgia, 42(3), 222–233. https://doi.org/10.3989/revmetalm.2006.v42.i3.22

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