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Humic acids in brown coals from the southern Russian Far East: General characteristics and interactions with precious metals

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Abstract

Brown coals with high Au and PGE concentrations from six deposits in the southern Russian Far East were analyzed for elemental composition, acid-base properties, and the molecular-size distribution of humic acids (HA). The ash contents of the coals were determined to be negatively correlated with their Au concentrations, and the content of “organic Au” (which is chemically bound to humic substances, HS) reaches 95%. The most probable mode of Au occurrence in the brown coals is submicrometer-sized particles of elemental gold stabilized by HA. Quantum-mechanical calculations of interactions between Au(0) clusters with model HS fragments confirm that HS could be originally strongly chemically adsorbed on the surface of elemental gold particles. Different stability of colloids during centrifuging of alkali extracts of the gold-bearing brown coals was proved to be likely responsible for the selective separation of free HA and those bound with gold particles, and this can be used to develop a technology for gold recovery from coals without decomposing their organic matrix.

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Authors and Affiliations

  1. Institute of Chemistry, Far East Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia

    V. A. Avramenko, S. Yu. Bratskaya, A. S. Yakushevich, A. V. Voit & S. I. Ivannikov

  2. Far East Geological Institute, Far East Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 660022, Russia

    V. V. Ivanov

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  1. V. A. Avramenko
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  2. S. Yu. Bratskaya
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Correspondence to S. Yu. Bratskaya.

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Original Russian Text © V.A. Avramenko, S.Yu. Bratskaya, A.S. Yakushevich, A.V. Voit, V.V. Ivanov, S.I. Ivannikov, 2012, published in Geokhimiya, 2012, Vol. 50, No. 5, pp. 483–493.

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Avramenko, V.A., Bratskaya, S.Y., Yakushevich, A.S. et al. Humic acids in brown coals from the southern Russian Far East: General characteristics and interactions with precious metals. Geochem. Int. 50, 437–446 (2012). https://doi.org/10.1134/S0016702912030032

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