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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="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">ipolytech</journal-id><journal-title-group><journal-title xml:lang="ru">iPolytech Journal</journal-title><trans-title-group xml:lang="en"><trans-title>iPolytech Journal</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2782-4004</issn><issn pub-type="epub">2782-6341</issn><publisher><publisher-name>Irkutsk National Research Technical University</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21285/1814-3520-2023-4-790-799</article-id><article-id custom-type="edn" pub-id-type="custom">WYVZQG</article-id><article-id custom-type="elpub" pub-id-type="custom">ipolytech-763</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="ru"><subject>МЕТАЛЛУРГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>METALLURGY</subject></subj-group></article-categories><title-group><article-title>Низкотемпературное спекание бокситового сырья со щелочью – альтернативная технология переработки бокситов по параллельному варианту способа Байер-спекания</article-title><trans-title-group xml:lang="en"><trans-title>Low-temperature sintering of bauxite raw material with alkali as an  alternative to the parallel Bayer sintering process</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1627-4634</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Логинова</surname><given-names>И. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Loginova</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Логинова Ирина Викторовна, д.т.н., профессор, профессор кафедры металлургии цветных металлов</p><p>620002, г. Екатеринбург, ул. Мира, 19</p></bio><bio xml:lang="en"><p>Irina V. Loginova, Dr. Sci. (Eng.), Professor, Professor of the Non-ferrous Metals Metallurgy Department</p><p>19, Mira St., Ekaterinburg 620002</p></bio><email xlink:type="simple">i.v.loginova@urfu.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/0000-0001-5111-5041</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Кырчиков</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kyrchikov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кырчиков Алексей Владимирович, к.т.н., доцент кафедры металлургии цветных металлов</p><p>620002, г. Екатеринбург, ул. Мира, 19</p></bio><bio xml:lang="en"><p>Aleksey V. Kyrchikov, Cand. Sci. (Eng.), Associate Professor of the Non-ferrous Metals Metallurgy Department</p><p>19, Mira St., Ekaterinburg 620002</p></bio><email xlink:type="simple">a.v.kyrchikov@urfu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Чайкин</surname><given-names>Л. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Chaikin</surname><given-names>L. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Чайкин Леонид Иванович, к.т.н., доцент кафедры металлургии цветных металлов</p><p>620002, г. Екатеринбург, ул. Мира, 19</p></bio><bio xml:lang="en"><p>Leonid I. Chaikin, Cand. Sci. (Eng.), Associate Professor of the Non-ferrous Metals Metallurgy Department</p><p>19, Mira St., Ekaterinburg 620002</p></bio><email xlink:type="simple">l.i.chaikin@urfu.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/0000-0003-2034-7928</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Напольских</surname><given-names>Ю. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Napolskikh</surname><given-names>Yu.  A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Напольских Юлия Александровна, к.т.н., инженер I категории кафедры металлургии цветных металлов</p><p>620002, г. Екатеринбург, ул. Мира, 19</p></bio><bio xml:lang="en"><p>Yulia A. Napolskikh, Cand. Sci. (Eng.), 1st Category Engineer of the Non-ferrous Metals Metallurgy Department</p><p>19, Mira St., Ekaterinburg 620002</p></bio><email xlink:type="simple">julia.napolskikh@urfu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Уральский федеральный университет им. первого Президента России Б.Н. Ельцина</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Ural Federal University named after the first President of Russia B.N. Yeltsin</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>10</day><month>01</month><year>2024</year></pub-date><volume>27</volume><issue>4</issue><fpage>790</fpage><lpage>799</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Логинова И.В., Кырчиков А.В., Чайкин Л.И., Напольских Ю.А., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Логинова И.В., Кырчиков А.В., Чайкин Л.И., Напольских Ю.А.</copyright-holder><copyright-holder xml:lang="en">Loginova I.V., Kyrchikov A.V., Chaikin L.I., Napolskikh Y.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" 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://ipolytech.elpub.ru/jour/article/view/763">https://ipolytech.elpub.ru/jour/article/view/763</self-uri><abstract><p>Цель – разработка альтернативной технологии переработки бокситового сырья на основе низкотемпературного спекания боксита с каустической щелочью, а также решение вопроса борьбы с углеродным следом на глиноземных заводах Урала. Лабораторные испытания проводились спеканием искусственно полученного бемита и гематита с химически чистой каустической щелочью при температурах 300, 500 и 700°С и дальнейшем их выщелачивании в слабощелочных растворах. Для изучения фазового, химического и гранулометрического составов красных шламов после выщелачивания в исследованиях были использованы различные физико-химические методы анализа: рентгенофлуоресцентный, метод титрования, рентгенофазовый, сканирующая электронная микроскопия, магнитометрия с вибрирующим образцом; для определения удельной площади поверхности и пористости использовали метод Брунауэра-Эммета-Теллера. В результате изучения кинетики прохождения твердофазной реакции взаимодействия бемита с каустической щелочью установлено, что в изучаемом температурном диапазоне взаимодействие идет в кинетическом режиме. Показано также, что при спекании гематита при температурах 300 и 500°С и дальнейшем выщелачивании спека водой происходит минералогическое изменение шлама с получением нового минерала – маггемита, обладающего магнитными свойствами. При изучении магнитных свойств красного шлама низкотемпературного спекания боксита установлено, что намагниченность достигает значения насыщения 19–20 электромагнитных единиц на г (при плотности образца 2,38 г/см3) при магнитном поле 10 кЭ. Удельная площадь поверхности этих образцов составила 54,97 и 51,77 м2/г. Выполненные исследования подтверждают возможность адаптации предложенной технологии для бокситов с получением высокожелезистых красных шламов. Это способствует комплексной переработке бокситового сырья и изучению возможности снижения углеродных выбросов на глиноземных заводах за счет исключения операции спекания с содой и известняком, которая сопровождается выделением CO2 при разложении этих соединений.</p></abstract><trans-abstract xml:lang="en"><p>The aim is to develop an alternative technology of bauxite raw material processing based on low-temperature sintering of bauxite with caustic alkali, as well as to solve the issue of carbon footprint control at alumina refineries in the Urals. Laboratory tests were carried out by sintering artificial bemite and hematite with chemically pure caustic alkali at temperatures of 300, 500 and 700°C and their further leaching in weakly alkaline solutions. To study the phase, chemical, and particle size distribution of red muds after leaching, various physical and chemical methods of analysis were used, such as X-ray fluorescence, titration method, X-ray phase analysis, scanning electron microscopy, magnetometry with a vibrating sample. The Brunauer – Emmett – Teller method was used to determine the specific surface area and porosity. The study of the kinetics of the solid-phase reaction of the bemite interaction with caustic alkali has shown the kinetic interaction in the temperature range under study. Moreover, sintering of hematite at temperatures of 300 and 500°C and further leaching of the sinter with water resulted in mineralogical changes in the sludge with the production of a new mineral, maghemite, which possesses magnetic properties. When studying the magnetic properties of red mud of lowtemperature sintering of bauxite, we determined that the magnetization was as high as 19–20 electromagnetic units per g (at a sample density of 2.38 g/cm3) at a magnetic field of 10 kE. The specific surface area of these samples was 54.97 and 51.77 m2/g. The performed studies confirm that the proposed technology can be adapted for bauxite to produce highiron red slimes, thus contributing to the integrated processing of bauxite raw materials. In addition, ways to reduce carbon emissions at alumina refineries by eliminating the sintering operation with soda and limestone, which is accompanied by CO2 emission during decomposition of these compounds, can be studied.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>алюминат натрия</kwd><kwd>каустическая щелочь</kwd><kwd>маггемит</kwd><kwd>спекание</kwd><kwd>красный шлам</kwd><kwd>углеродный след</kwd></kwd-group><kwd-group xml:lang="en"><kwd>sodium aluminate</kwd><kwd>caustic alkali</kwd><kwd>maghemite</kwd><kwd>sintering</kwd><kwd>red mud</kwd><kwd>carbon footprint</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках гранта Российского научного фонда № 22-29-01515.</funding-statement><funding-statement xml:lang="en">The work was funded by the Russian Science Foundation grant No. 22-29-01515.</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">Сабирзянов Н.А., Яценко С.П. 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