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Article

  • Title

    The thermodynamic analysis of chemical transformations in dissolving gold in the cyanic solutions made on the basis of plasma-chemically treated water

  • Authors

    Vorobyova Margarita I.
    Pivovarov Alexandr A.
    Vorobyova Viktoriya I.

  • Subject

    CHEMISTRY. CHEMICAL ENGINEERING

  • Year 2014
    Issue 1(43)
    UDC 669.213.6
    DOI 10.15276/opu.1.43.2014.43
    Pages 254-259
  • Abstract

    Usage of traditional techniques of extracting  gold by cyanidation is accompanied by increased costs for certain manufacturing operations. The paper is devoted to the thermodynamic analysis of gold dissolution in cyanide solutions made on the basis of plasmochemically activated water. It is established that рН value affects the process of gold dissolution by the cyanide solutions prepared with the use of water treated by the contact nonequilibrium low-temperature plasma. Gibbs energy change for a pair of redox reactions in the system under study has the form of a function with a pronounced minimum at рН=9,30 (∆G=-2050 kJ/mol), and an excess at рН=11,63 (∆G=-1950 kJ/mol).

  • Keywords

    contact nonequilibrium low-temperature plasma, cyanide solutions, gold, oxidation / reduction potentialcontact nonequilibrium low-temperature plasma, cyanide solutions, gold, oxidation/reduction potential

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  • References

    Література
    1.    Wadsworth, M.E. Gold dissolution and activation in cyanide solution: kinetics and mechanism / M.E. Wadsworth, X. Zhu, J.S. Thompson, C.J. Pereira // Hydrometallurgy. — 2000. — Vol. 57, № 1. —РP. 1—11.
    2.    Marsden, J. The Chemistry of the Extraction of Gold / J. Marsden, I. House. — 2nd ed. — Society for Mining, Metallurgy, and Exploration, 2006. — 682 p.
    3.    Пивоваров, А.А. Исследование эффективности применения плазмохимически активированных растворов при выщелачивании благородных металлов из рудных концентратов / А.А. Пивоваров, М.И. Воробьева // Металлургическая и горнорудная промышленность. — 2012. — № 5. — С. 60—63.
    4.    Воробйова, М.І. Розчинення срібла в плазмохімічно активованих розчинах / М.І. Воробйова, О.А. Півоваров // Наукові вісті НТУУ “КПІ”. — 2013. — № 1. — С. 129—134.
    5.    Senanayake, G. Kinetics and reaction mechanism of gold cyanidation: Surface reaction model via Au(I)–OH–CN complexes / G. Senanayake // Hydrometallurgy. — 2005. — Vol. 80, № 1–2. —РP. 1—12.

    References
    1.    Wadsworth, M.E. Gold dissolution and activation in cyanide solution: kinetics and mechanism / M.E. Wadsworth, X. Zhu, J.S. Thompson, C.J. Pereira // Hydrometallurgy. — 2000. — Vol. 57, # 1. —pp. 1—11.
    2.    Marsden, J. The Chemistry of the Extraction of Gold / J. Marsden, I. House. — 2nd ed. — Society for Mining, Metallurgy, and Exploration, 2006. — 682 p.
    3.    Pivovarov, A.A. Issledovanie  effektivnosti  primeneniya  plazmokhimicheskikh aktivirovannykh  rastvorov pri  vyshchelachivanii  blagorodnykh  metallov iz rudnykh  kontsentratov  [The study of application effi-ciency of plasma chemically activated  solutions  when  leaching  precious metals from ore concentrates] / A.A. Pivovarov,  M.I. Vorob’yeva  // metallurgicheskaya  i gornorudnaya  promyshlennost’ [Metallurgical and Metal Mining Industry]. – 2012. – #5. – pp. 60 – 63.
    4.    Vorobiova, M.I. Rozchynennia  sribla v plazmokhimichno aktyvovanykh  rozchynakh  [Dissolution of sil-ver in plasma-chemically activated solutions] / M.I. Vorobiova, O.A. Pivovarov // Naukovi visti NTUU “KPI”[Scientific News of NTUU “KPI”]. – 2013. – #1. – pp. 129 – 134.
    5.    Senanayake, G. Kinetics and reaction mechanism of gold cyanidation: Surface reaction model via Au(I)–OH–CN complexes / G. Senanayake // Hydrometallurgy. — 2005. — Vol. 80, # 1–2. —pp. 1—12.

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