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    <journal-meta>
      <journal-id journal-id-type="issn">2411-3336</journal-id>
      <journal-id journal-id-type="eissn">2541-9404</journal-id>
      <journal-title-group>
        <journal-title xml:lang="ru">Записки Горного института</journal-title>
        <journal-title xml:lang="en">Journal of Mining Institute</journal-title>
      </journal-title-group>
      <publisher>
        <publisher-name xml:lang="ru">Санкт-Петербургский горный университет императрицы Екатерины ΙΙ</publisher-name>
        <publisher-name xml:lang="en">Empress Catherine II Saint Petersburg Mining University</publisher-name>
      </publisher>
    </journal-meta>
    <article-meta>
      <article-id custom-type="edn" pub-id-type="custom">RJTNNI</article-id>
      <article-id custom-type="pmi" pub-id-type="custom">pmi-15852</article-id>
      <article-id pub-id-type="uri">https://pmi.spmi.ru/pmi/article/view/15852</article-id>
      <article-categories>
        <subj-group subj-group-type="section-heading" xml:lang="ru">
          <subject>Геотехнология и инженерная геология</subject>
        </subj-group>
        <subj-group subj-group-type="section-heading" xml:lang="en">
          <subject>Geotechnical Engineering and Engineering Geology</subject>
        </subj-group>
      </article-categories>
      <title-group>
        <article-title xml:lang="en">Improvement of concentrate quality in flotation of low-rank coal</article-title>
        <trans-title-group xml:lang="ru">
          <trans-title>Повышение качества концентрата  во флотационном обогащении низкосортного угля</trans-title>
        </trans-title-group>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <name name-style="eastern">
            <surname>Kondratev</surname>
            <given-names>Sergei A.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Кондратьев</surname>
              <given-names>С. А.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Kondratev</surname>
              <given-names>Sergei A.</given-names>
            </name>
          </name-alternatives>
          <email>bagrowa@bk.ru</email>
          <contrib-id contrib-id-type="orcid">0000-0002-8245-2259</contrib-id>
          <xref ref-type="aff" rid="aff1"/>
        </contrib>
        <aff-alternatives id="aff1">
          <aff>
            <institution xml:lang="ru">Институт горного дела им. Н.А.Чинакала СО РАН (Новосибирск, Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en">Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences (Novosibirsk, Russia)</institution>
          </aff>
        </aff-alternatives>
        <contrib contrib-type="author" corresp="yes">
          <name name-style="eastern">
            <surname>Khamzina</surname>
            <given-names>Tatyana A.</given-names>
          </name>
          <name-alternatives>
            <name name-style="eastern" xml:lang="ru">
              <surname>Хамзина</surname>
              <given-names>Т. А.</given-names>
            </name>
            <name name-style="western" xml:lang="en">
              <surname>Khamzina</surname>
              <given-names>Tatyana A.</given-names>
            </name>
          </name-alternatives>
          <email>bagrowa@bk.ru</email>
          <contrib-id contrib-id-type="orcid">0000-0002-1281-9801</contrib-id>
          <xref ref-type="aff" rid="aff2"/>
        </contrib>
        <aff-alternatives id="aff2">
          <aff>
            <institution xml:lang="ru">Институт горного дела им. Н.А.Чинакала СО РАН (Новосибирск, Россия)</institution>
          </aff>
          <aff>
            <institution xml:lang="en">Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences (Novosibirsk, Russia)</institution>
          </aff>
        </aff-alternatives>
      </contrib-group>
      <pub-date pub-type="epub" iso-8601-date="2023-09-01">
        <day>01</day>
        <month>09</month>
        <year>2023</year>
      </pub-date>
      <pub-date date-type="collection">
        <year>2024</year>
      </pub-date>
      <volume>265</volume>
      <fpage>65</fpage>
      <lpage>77</lpage>
      <history>
        <date date-type="received" iso-8601-date="2022-05-17">
          <day>17</day>
          <month>05</month>
          <year>2022</year>
        </date>
        <date date-type="accepted" iso-8601-date="2023-04-03">
          <day>03</day>
          <month>04</month>
          <year>2023</year>
        </date>
        <date date-type="rev-recd" iso-8601-date="2024-02-29">
          <day>29</day>
          <month>02</month>
          <year>2024</year>
        </date>
      </history>
      <permissions>
        <copyright-statement xml:lang="ru">© 2023 С. А. Кондратьев, Т. А. Хамзина</copyright-statement>
        <copyright-statement xml:lang="en">© 2023 Sergei A. Kondratev, Tatyana A. Khamzina</copyright-statement>
        <copyright-year>2023</copyright-year>
        <copyright-holder xml:lang="ru">С. А. Кондратьев, Т. А. Хамзина</copyright-holder>
        <copyright-holder xml:lang="en">Sergei A. Kondratev, Tatyana A. Khamzina</copyright-holder>
        <license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0" xml:lang="ru">
          <license-p>Эта статья доступна по лицензии Creative Commons Attribution 4.0 International (CC BY 4.0)</license-p>
        </license>
        <license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0" xml:lang="en">
          <license-p>This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0)</license-p>
        </license>
      </permissions>
      <self-uri xlink:type="simple" xlink:href="https://pmi.spmi.ru/pmi/article/view/15852">https://pmi.spmi.ru/pmi/article/view/15852</self-uri>
      <abstract xml:lang="ru">
        <p>Доля углей высоких стадий метаморфизма с низким содержанием золы, влаги и серы в общей массе добываемых углей незначительна. Основная часть добываемых углей сравнительно низкого качества (бурые, каменные: длиннопламенные и газовые). В условиях возрастания требований к экологической чистоте угольной продукции их эффективное использование возможно только при улучшении технологических свойств. Рассмотрен вопрос повышения показателей флотационного обогащения низкосортного угля на основе механизма работы физически сорбированного собирателя в элементарном акте флотации. Раскрыты причины повышения выхода концентрата с сохранением низкого содержания золы в результате применения сочетания собирателей с отличающимися физическими свойствами. Показано, что поверхностная активность по отношению к границе раздела «газ – жидкость» и плотность сорбции гетерополярного реагента определяют его собирательные свойства. На основе зависимости извлечения от поверхностной активности установлена связь между собирательной активностью химического соединения и строением его молекул. Применение композиции собирателей с отличающимися значениями поверхностной активности открывает возможность изменения ее собирательных и селективных свойств. Механизм работы физически сорбированного собирателя может быть базой для разработки рекомендаций по изменению извлечения и зольности концентрата, выбору оптимальных соотношений поверхностных активностей по отношению к границе раздела «газ – жидкость» собирателей, содержащихся в композиции.</p>
      </abstract>
      <abstract xml:lang="en">
        <p>Percentage of high-rank coal with low content of ash, moisture, and sulfur in total coal production output is low. Most of the produced coal has a low quality (lignite, bituminous coal: long-flame and fiery). Under increasing requirements for ecological cleanness of coal, the efficient use of coal products is only possible after improvement of their processing properties. The authors discuss the enhancement of flotation efficiency of low-rank coal using the mechanism of physisorption of a collecting agent in particle – bubble attachment. It is explained why the yield of concentrate with low ash content increases as a result of combination of collectors having different physical properties. It is shown that the surface activity of a heteropolar agent relative to the gas – liquid interface and the adsorption density of the agent govern its collecting properties. Based on the recovery – surface activity relationship, the correlation is found between the collecting activity of a chemical compound and the structure of its molecules. The combination of the collectors with different surface activity enables adjusting collectability and selectivity of the blend. The physisorption mechanism of collectors can be a framework for developing recommendations on modification of concentrate yield and ash content, and on selection of optimized ratios of surface activities of miscible collectors relative to the gas – liquid interface.</p>
      </abstract>
      <kwd-group xml:lang="ru">
        <title>Ключевые слова</title>
        <kwd>флотация</kwd>
        <kwd>уголь</kwd>
        <kwd>выход концентрата</kwd>
        <kwd>содержание золы</kwd>
        <kwd>поверхностная активность реагента</kwd>
        <kwd>селективность извлечения</kwd>
      </kwd-group>
      <kwd-group xml:lang="en">
        <title>Keywords</title>
        <kwd>flotation</kwd>
        <kwd>coal</kwd>
        <kwd>concentrate yield</kwd>
        <kwd>ash content</kwd>
        <kwd>agent surface activity</kwd>
        <kwd>extraction selectivity</kwd>
      </kwd-group>
      <funding-group>
        <funding-statement xml:lang="ru">Исследование выполнено за счет гранта Российского научного фонда № 22-27-00084.</funding-statement>
        <funding-statement xml:lang="en">The study was supported by the Russian Science Foundation, Grant N 22-27-00084.</funding-statement>
      </funding-group>
    </article-meta>
  </front>
  <body/>
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