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Erschienen in:
2016 | OriginalPaper | Buchkapitel
Influence of Cu2+ and Zn2+ on the Dissolution of Ag IN S2O32- Medium
verfasst von : Julio Cesar Juárez, Isauro Rivera, Francisco Patiño, Juan Hernández, Martin Reyes, Ma Ángeles de los Hernández
Erschienen in: Characterization of Minerals, Metals, and Materials 2015
Verlag: Springer International Publishing
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The dissolution of Ag contained in metallurgical tailings was studied by adding ions Cu2+ and Zn2+ in S2O32- medium. Chemical analysis of mine tailings by cupellation revealed a Ag concentration of 71 g/ton. The XRF and XRD analysis confirmed the preponderance of SiO2 in the mineral matrix. The experimental dissolution process was conducted in alkaline solution using six concentrations of NaOH and five of S2O32-, at different temperatures, also using five concentrations of Cu2+ and Zn2+ as a catalyst. The results showed similar values for both systems (96.8% and 97.13%). The ion Cu2+ and Zn2+ increases the dissolution of Ag, and decrease the reaction time of dissolution. Under the conditions used, pH and stirring rate did not affect the dissolution of Ag.