gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-2s-0619gtcrust-1463Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSЭКСПЕРИМЕНТАЛЬНЫЕ ДАННЫЕ ПО СТУПЕНЧАТОМУ ВЫЩЕЛАЧИВАНИЮ ВЕЩЕСТВ С ИЗВЕСТНЫМИ ФОРМАМИ НАХОЖДЕНИЯ AuSEQUENTIAL EXTRACTION OF SUBSTANCES WITH KNOWN Au SPECIATION – AN EXPERIMENTAL DATAhttps://orcid.org/0000-0002-8611-2542Сарыг-оолБ. Ю.Saryg-oolB. Y.

630090, Новосибирск, пр-т Академика Коптюга, 3

Bagai-ool Y. Saryg-ool

3 Academician Koptyug Ave, Novosibirsk 630090

sarygool@igm.nsc.ruhttps://orcid.org/0000-0001-7172-4688МягкаяИ. Н.MyagkayaI. N.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0001-8095-4485ЖмодикС. М.ZhmodikS. M.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0003-4754-5051ТепляковаТ. В.TeplyakovaT. V.

630559, Кольцово

Koltsovo 630559

https://orcid.org/0000-0001-6617-3287ЛазареваЕ. В.LazarevaE. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian FederationГосударственный научный центр вирусологии и биотехнологии «Вектор»РоссияState Research Center of Virology and Biotechnology “Vector”Russian Federation202205052022132619619Copyright © Сарыг-оол Б.Ю., Мягкая И.Н., Жмодик С.М., Теплякова Т.В., Лазарева Е.В., 20222022Сарыг-оол Б.Ю., Мягкая И.Н., Жмодик С.М., Теплякова Т.В., Лазарева Е.В.Saryg-ool B.Y., Myagkaya I.N., Zhmodik S.M., Teplyakova T.V., Lazareva E.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/1463

Изучены особенности распределения Au по фракциям 7-ступенчатой методики выщелачивания с применением модельных веществ, приближенных по составу к природным образцам из ореола рассеяния сульфидных хвостохранилищ. Применялись модельные вещества с известными формами нахождения Au: крупное самородное золото, наноразмерное самородное золото, Au-содержащие пирит, гуминовые кислоты и оксиды/гидроксиды Fe(III). На их основе были приготовлены смеси с веществами-наполнителями с низкими содержаниями Au (кварц, известняк, гуминовые кислоты, оксиды/гидроксиды Fe(III)).

Установлено, что при ступенчатом выщелачивании наблюдается совместное извлечение нескольких форм золота в одной фракции. Наноразмерное Au0 и золото, связанное с органическим веществом, совместно извлекаются в легкоокисляемой (органической) фракции; золото, связанное с соединениями Fe(III), и комплексы Au, хемосорбированные на поверхности других минералов (сульфиды, алюмосиликаты), – в восстанавливаемой (гидроксидной) фракции; «невидимое» золото в сульфидах, наноразмерное и, частично, крупное (с размером частиц >1 мкм) Au0 – в трудноокисляемой (сульфидной) фракции. Крупное Au0 извлекается преимущественно в остаточной фракции. Мобильные формы элемента представляют собой Au, связанное с легкорастворимыми органическими соединениями, и комплексы ионного Au, десорбированные с поверхности минералов.

A study has been conducted on the features of distriburion of Au among the fractions of a 7-step sequential extraction procedure using model substances that are similar in composition to natural organic matter from the dispersion train of sulfide tailings. Use has been made of model substances with known Au speciations: bulk native gold, nanoscale native gold, Au-containing pyrite, humic acids, and Fe(III) oxides/hydroxides, which served as the basis for preparing mixtures with low-Au filler substances (quartz, limestone, humic acids, Fe(III) oxides/hydroxides).

It has been stated that several Au species are leached in one fraction during sequential extraction. Nanoscale Au0 and gold bound to the organic matter are leached together in easily oxidizable (organic) fraction; gold bound to Fe(III) compounds and Au complexes chemisorbed on the surface of other minerals (sulfides, aluminosilicates) are leached in reducible (hydroxides) fraction; "invisible" gold in sulfides, nanoscale Au0 and, partially, >1 μm-seized bulk Au0 are leached in hardly oxidizable (sulfidic) fraction. Bulk native gold is leached predominantly in residual fraction. Mobile species are Au bound to water-soluble organic compounds and complexes of ionic Au desorbed from the surface of minerals.

ступенчатое выщелачиваниеформы нахождениянаночастицы золота«невидимое» золотомобильное золотоsequential extractionspeciationgold nanoparticles"invisible" goldmobile gold speciesИсследования выполнены в рамках государственного задания Института геологии и минералогии им. В.С. Соболева СО РАН в ЦКП Многоэлементных и изотопных исследований ИГМ СО РАН (г. Новосибирск, Россия).The study was performed as a part of a government assignment for the Sobolev Institute of Geology and Mineralogy SB RAS, at the Analytical Center for multi-elemental and isotope research (Novosibirsk, Russia).ReferencesBloom N.S., Preus E., Katon J., Hiltner M., 2003. Selective Extractions to Assess the Biogeochemically Relevant Fractionation of Inorganic Mercury in Sediments and Soils. Analytica Chimica Acta 479 (2), 233–248. https://doi.org/10.1016/S0003-2670(02)01550-7.Bloom N.S., Preus E., Katon J., Hiltner M., 2003. 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The authors declare that there are no conflicts of interest present.