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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">gscience</journal-id><journal-title-group><journal-title xml:lang="en">Mining Science and Technology (Russia)</journal-title><trans-title-group xml:lang="ru"><trans-title>Горные науки и технологии</trans-title></trans-title-group></journal-title-group><issn pub-type="epub">2500-0632</issn><publisher><publisher-name>The National University of Science and Technology MISiIS (NUST MISIS)</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/2500-0632-2024-03-229</article-id><article-id custom-type="elpub" pub-id-type="custom">gscience-673</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>BENEFICIATION AND PROCESSING OF NATURAL AND TECHNOGENIC RAW MATERIALS</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОБОГАЩЕНИЕ, ПЕРЕРАБОТКА МИНЕРАЛЬНОГО И ТЕХНОГЕННОГО СЫРЬЯ</subject></subj-group></article-categories><title-group><article-title>“Invisible” noble metals in carbonaceous rocks and beneficiation products: feasibility of detection and coarsening</article-title><trans-title-group xml:lang="ru"><trans-title>«Невидимые» благородные металлы в углеродистых породах и продуктах обогащения: возможность выявления и укрупнения</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3069-0001</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Александрова</surname><given-names>Т. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Aleksandrova</surname><given-names>Т.  N. </given-names></name></name-alternatives><bio xml:lang="ru"><p>Татьяна Николаевна Александрова – доктор технических наук, профессор, член-корреспондент РАН</p><p>Scopus ID 57216873316, ResearcherID A-5418-2014</p><p>г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>Tayana N. Aleksandrova – Dr. Sci. (Eng.), Professor, Corresponding Member of the Russian Academy of Sciences</p><p>Scopus ID 57216873316, ResearcherID A-5418-2014</p><p>St. Petersburg</p></bio><email xlink:type="simple">Aleksandrova_TN@pers.spmi.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8451-2489</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Афанасова</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Afanasova</surname><given-names>A.  V. </given-names></name></name-alternatives><bio xml:lang="ru"><p>Анастасия Валерьевна Афанасова – кандидат технических наук, доцент</p><p>Scopus ID 57188630049, ResearcherID AAH-4333-2019</p><p>г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>Anastasia V. Afanasova – Cand. Sci. (Eng.), Associate Professor</p><p>Scopus ID 57188630049, ResearcherID AAH-4333-2019</p><p>St. Petersburg</p></bio><email xlink:type="simple">Afanasova_AV@pers.spmi.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1364-5006</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Абурова</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Aburova</surname><given-names>V.  A. </given-names></name></name-alternatives><bio xml:lang="ru"><p>Валерия Александровна Абурова – аспирант</p><p>Scopus ID 57503048800</p><p>г. Санкт-Петербург</p></bio><bio xml:lang="en"><p>Valeria A. Aburova – PhD-Student</p><p>Scopus ID 57503048800</p><p>St. Petersburg</p></bio><email xlink:type="simple">aburovaleria@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Санкт-Петербургский горный университет императрицы Екатерины II<country>Россия</country></aff><aff xml:lang="en">Empress Catherine II Saint Petersburg Mining University<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>20</day><month>09</month><year>2024</year></pub-date><volume>9</volume><issue>3</issue><fpage>231</fpage><lpage>242</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Aleksandrova Т.N., Afanasova A.V., Aburova V.A., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Александрова Т.Н., Афанасова А.В., Абурова В.А.</copyright-holder><copyright-holder xml:lang="en">Aleksandrova Т.N., Afanasova A.V., Aburova V.A.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://mst.misis.ru/jour/article/view/673">https://mst.misis.ru/jour/article/view/673</self-uri><abstract><p>The decrease in the quality of raw materials coming for processing requires involvement of refractory ores in processing, the refractoriness of which is caused by the presence of organic carbonaceous matter sorption-active in relation to dissolved noble metals and impregnation of fine noble metals in mineral-carriers. In this connection, the actual research line is the development of new technological solutions with the use of energy methods of action in order to reduce the losses of valuable components in beneficiation tailings. Treatment with ultra-high frequency electromagnetic radiation has a number of advantages, including rapid and selective heating due to the differences in the ability of minerals to absorb this radiation. Carbon-containing materials represented by carbonaceous flotation concentrate and model samples of activated carbon with adsorbed silver were taken as the research subjects. Using the model samples as an example, the necessity of using magnetite to achieve coarsening fine silver particles during ultra-high frequency treatment was substantiated. The formation of active centers of local heating during the treatment in the points of magnetite addition was confirmed. The necessary content of magnetite of 10% for coarsening fine silver to spherical aggregates, the average size of which was 20–40 microns, was substantiated. Coarsening noble metal particles to sizes of 20–50 microns in treated carbonaceous concentrates containing silver and gold was achieved, when the substantiated amount of magnetite was added. Coarsened particles (aggregates) of noble metals can be recovered using traditional beneficiation methods.</p></abstract><trans-abstract xml:lang="ru"><p>По причине снижения качества поступающего на переработку сырья, вовлечения упорных руд, упорность которых обусловлена наличием сорбционно-активного по отношению к растворенным благородным металлам органического углеродистого вещества и вкрапленностью низкоразмерных благородных металлов в минералы-носители, актуальным направлением является разработка новых технологических решений с применением энергетических методов воздействия с целью снижения потерь ценных компонентов с хвостами обогащения. Обработка электромагнитным излучением сверхвысокой частоты обладает рядом преимуществ, среди которых отмечаются быстрый и селективный нагрев за счет различий в способности поглощать минералами данное излучение. В качестве объекта исследования приняты углеродсодержащие материалы, представленные углеродистым флотационным концентратом и модельными навесками активированного угля с адсорбированным серебром. На примере модельных навесок обоснована необходимость использования магнетита для достижения укрупнения низкоразмерного серебра при сверхвысокочастотной обработке. Подтверждено образование активных центров локального нагрева в местах добавления магнетита в процессе обработки. Обосновано необходимое содержание магнетита для укрупнения низкоразмерного серебра до сферических агрегатов, средний размер которых составил 20–40 мкм, равное 10 %. Получено укрупнение частиц благородных металлов в обработанных углеродистых концентратах до размеров 20–50 мкм, содержащих серебро и золото, при добавлении обоснованного количества магнетита. Укрупненные частицы благородных металлов возможно извлекать с применением традиционных методов обогащения.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>СВЧ обработка</kwd><kwd>углеродистый концентрат</kwd><kwd>золотосодержащие руды</kwd><kwd>модельные навески</kwd><kwd>флотация</kwd><kwd>серебро</kwd><kwd>магнетит</kwd></kwd-group><kwd-group xml:lang="en"><kwd>microwave treatment</kwd><kwd>carbonaceous concentrate</kwd><kwd>gold-bearing ores</kwd><kwd>model samples</kwd><kwd>flotation</kwd><kwd>silver</kwd><kwd>magnetite</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Работа выполнена в рамках гранта РНФ (проект № 23-47-00109).</funding-statement></funding-group><funding-group xml:lang="en"><funding-statement>The study was carried out within the framework of a grant from the Russian Science Foundation (Project No. 23-47-00109).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Федотов П. 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