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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">cvmet</journal-id><journal-title-group><journal-title xml:lang="ru">Известия вузов. Цветная металлургия</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya. Non-Ferrous Metallurgy</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0021-3438</issn><issn pub-type="epub">2412-8783</issn><publisher><publisher-name>НИТУ МИСИС</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/0021-3438-2022-3-21-29</article-id><article-id custom-type="elpub" pub-id-type="custom">cvmet-1374</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 редких и благородных металлов</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Metallurgy of Rare and Precious Metals</subject></subj-group></article-categories><title-group><article-title>Рациональная технология разделения редкоземельных элементов иттриевой группы</article-title><trans-title-group xml:lang="en"><trans-title>Rational technology for separation of yttrium-group rare-earth elements</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Вальков</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Valkov</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>докт. техн. наук, проф.</p><p>кафедра общей химии</p><p>115409</p><p>Каширское ш., 31</p><p>Москва</p></bio><bio xml:lang="en"><p>Doctor of Technical Sciences, Professor</p><p>Department of General Chemistry</p><p>115409</p><p>Kashirskoe sh., 31</p><p>Moscow</p></bio><email xlink:type="simple">ale11534@yandex.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>Петров</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Petrov</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. хим. наук, доцент</p><p>кафедра общей химии</p><p>Москва</p></bio><bio xml:lang="en"><p>Candidate of Chemical Sciences, Associate Professor</p><p>Department of General Chemistry</p><p>Moscow</p></bio><email xlink:type="simple">vipetrov@meph.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Национальный исследовательский ядерный университет «МИФИ»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>National Research Nuclear University «MEPHI»</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>15</day><month>06</month><year>2022</year></pub-date><volume>0</volume><issue>3</issue><fpage>21</fpage><lpage>29</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Вальков А.В., Петров В.И., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Вальков А.В., Петров В.И.</copyright-holder><copyright-holder xml:lang="en">Valkov A.V., Petrov V.I.</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://cvmet.misis.ru/jour/article/view/1374">https://cvmet.misis.ru/jour/article/view/1374</self-uri><abstract><p>   Рассмотрены особенности экстракционной технологии разделения редкоземельных элементов иттриевой группы с учетом резкого снижения цен на индивидуальные оксиды. Последнее, как и низкие цены оксидов лантана и церия, связано с преимущественным ростом потребления празеодима и неодима и замедленным ростом потребления остальных редкоземельных элементов (РЗЭ), за исключением тербия и диспрозия. Так как из редкоземельных концентратов извлекаются все РЗЭ, менее востребованные складируются или продаются по крайне низким ценам. Такие элементы, как самарий, европий, гадолиний, диспрозий, применяются в наукоемких приборах и устройствах. При этом можно допустить и функционирование малорентабельного производства, но непременно технологические решения должны быть построены с учетом минимальных затрат и быть экономически наиболее эффективными. В данной работе предлагается технология разделения элементов иттриевой группы, включающая стадии выделения иттрия в однокаскадном режиме экстракцией смесью трех экстрагентов (25 об. % триалкилметиламмонийнитрата – 20 об.% трибутилфосфата – 20 об. % высшей изомерной карбоновой кислоты) с последующим отделением триады элементов (самария–европия–гадолиния) экстракцией фосфорорганическими кислотами: 30 об. % раствором ди-2-этилгексилфосфорной кислоты или 30 об.% раствором бис(2,4,4-триметилпентил)-фосфиновой кислоты. На последней операции одновременно выделяют концентраты РЗЭ иттриевой группы. Процесс проводят в режиме полного внутреннего орошения с использованием в качестве экстрагента 30 об. % раствора бис(2,4,4-триметилпентил)-фосфиновой кислоты. Первоначально заполняют все ячейки каскада исходным раствором. В ячейках каскада формируются зоны разделения с накоплением в определенных ячейках концентратов тербия–диспрозия, гольмия–эрбия и тулия–иттербия–лютеция. После накопления продуктов раствор концентратов сливают из ячеек и процесс начинают вновь. При возникновении потребностей в каком-либо элементе иттриевой группы проводят разделение соответствующего бинарного или тройного концентрата с выделением требуемого элемента.</p></abstract><trans-abstract xml:lang="en"><p>   The paper studies the features of the extraction technology used to separate yttrium-group rare-earth elements taking into account sharply reducing prices for individual oxides. The latter, along with the low prices for lanthanum and cerium oxides, is associated with a predominant increase in the consumption of praseodymium and neodymium and a slow increase in the consumption of other rare-earth elements (REE), except for terbium and dysprosium. Since all REE are extracted from rare-earth concentrates, less marketable ones are stored or sold at extremely low prices. Elements such as samarium, europium, gadolinium, dysprosium are used in high-tech instruments and devices. At the same time, some low-profit production is possible, but process solutions must certainly be developed providing for minimum costs and be the most cost-effective. The authors propose a technology for separating yttrium-group elements including yttrium isolation stages in a single-stage mode by extraction with a mixture of three extractants (25 vol.% trialkylmethylammonium nitrate – 20 vol. % tributyl phosphate – 20 vol.% higher isomeric carboxylic acid) followed by separation of the triad of elements (samarium-europium-gadolinium) by extraction with organophosphoric acids: 30 vol.% solution of di-2-ethylhexylphosphoric acid or 30 vol.% solution of bis(2,4,4-trimethylpentyl)-phosphinic acid. At the last operation, yttrium-group REE concentrates are isolated simultaneously. The process is conducted in the conditions of complete internal irrigation with the 30 vol.% solution of bis(2,4,4-trimethylpentyl)-phosphinic acid used as an extractant. Initially, all the extraction cascade cells are filled with the initial solution. Separation zones are formed in the extraction cascade with the accumulation of terbium-dysprosium, holmium-erbium and thulium-ytterbium-lutetium concentrates in some cells. Once the products are accumulated, the concentrate solution is drained from cells, and the process starts again. If there is a need in some yttrium-group element, the corresponding binary or ternary concentrate is separated with the isolation of the element required.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>редкоземельные элементы</kwd><kwd>иттриевая группа</kwd><kwd>экстракция</kwd><kwd>смеси экстрагентов</kwd><kwd>алкилфосфорные кислоты</kwd><kwd>разделение</kwd><kwd>нестационарный режим</kwd><kwd>накопление редкоземельных элементов в ячейках каскада</kwd></kwd-group><kwd-group xml:lang="en"><kwd>rare-earth elements</kwd><kwd>yttrium group</kwd><kwd>extraction</kwd><kwd>mixtures of extractants</kwd><kwd>alkyl phosphoric acids</kwd><kwd>separation</kwd><kwd>non-stationary mode</kwd><kwd>accumulation of rare-earth elements in cascade cells</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Lucie Bartonova, Jana Serencisova, Bohumir Cech. 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