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The effect of sulfide ion chemisorption on the kinetics of gold dissolution in cyanide solutions

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Abstract

The effect of sodium sulfide additions (from 5 × 10−6 to 2 × 10−5 M) on the kinetics of gold dissolution in cyanide solutions of the following composition, M: 0.1 KCN, 0.02 KAu(CN)2, 0.5 K2SO4, pH 10–13 is studied. Hydrosulfide ions are shown to exert a strong catalytic effect on the dissolution kinetics of this metal in a potential range where their adsorption is accompanied by the formation of polysulfides (−0.2 < E < 0.4 V). The reaction acceleration depend on the potential and is 100-fold for E ≃ 0.1 V. The effect becomes more pronounced as the concentration of hydrosulfide ions increases to 10−4 M and is almost pH-independent in the pH range from 10 to 13. An attempt to explain the found relationships is undertaken.

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Authors and Affiliations

  1. Institute of Solid State Chemistry and Mechanochemistry, Siberian Division, Russian Academy of Sciences, Ul. Kutateladze 18, Novosibirsk, 630128, Russia

    R. Yu. Bek & L. I. Shuraeva

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  1. R. Yu. Bek
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  2. L. I. Shuraeva
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Correspondence to R. Yu. Bek.

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Original Russian Text © R.Yu. Bek, L.I. Shuraeva, 2008, published in Elektrokhimiya, 2008, Vol. 44, No. 7, pp. 827–832.

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Bek, R.Y., Shuraeva, L.I. The effect of sulfide ion chemisorption on the kinetics of gold dissolution in cyanide solutions. Russ J Electrochem 44, 767–771 (2008). https://doi.org/10.1134/S102319350807001X

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