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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">10.17073/0021-3438-2015-5-25-33</article-id><article-id custom-type="elpub" pub-id-type="custom">cvmet-260</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>ТЕРМОДИНАМИЧЕСКОЕ ИССЛЕДОВАНИЕ ЭКСТРАКЦИИ ЦЕРИЯ (III) ТРИБУТИЛФОСФАТОМ ИЗ РАСТВОРОВ ФОСФОРНОЙ КИСЛОТЫ</article-title><trans-title-group xml:lang="en"><trans-title>Thermodynamic investigation of extraction of cerium(III) by tributyl phosphate from phosphoric acid solutions</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>Черемисина</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Cheremisina</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>докт. техн. наук, профессор кафедры общей и физической химии НМСУ «Горный» (199106, г. Санкт-Петербург, Васильевский остров, 21-я линия, 2).</p></bio><email xlink:type="simple">ovcheremisina@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>Сергеев</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Sergeev</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>аспирант этой кафедры</p></bio><email xlink:type="simple">sergeev.spmi@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>Чиркст</surname><given-names>Д. Э.</given-names></name><name name-style="western" xml:lang="en"><surname>Chirkst</surname><given-names>D. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>докт. хим. наук, профессор, заведующий этой кафедрой</p></bio><email xlink:type="simple">chirkst47@mail.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>Литвинова</surname><given-names>Т. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Litvinova</surname><given-names>T. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>канд. техн. наук, доцент этой кафедры</p></bio><email xlink:type="simple">viritsa@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff xml:lang="ru" id="aff-1"><institution>Национальный минерально-сырьевой университет «Горный», г. Санкт-Петербург</institution><country>Russian Federation</country></aff><pub-date pub-type="collection"><year>2015</year></pub-date><pub-date pub-type="epub"><day>12</day><month>12</month><year>2015</year></pub-date><volume>0</volume><issue>5</issue><fpage>25</fpage><lpage>33</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Черемисина О.В., Сергеев В.В., Чиркст Д.Э., Литвинова Т.Е., 2015</copyright-statement><copyright-year>2015</copyright-year><copyright-holder xml:lang="ru">Черемисина О.В., Сергеев В.В., Чиркст Д.Э., Литвинова Т.Е.</copyright-holder><copyright-holder xml:lang="en">Cheremisina O.V., Sergeev V.V., Chirkst D.E., Litvinova T.E.</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/260">https://cvmet.misis.ru/jour/article/view/260</self-uri><abstract><p>Изучен механизм экстракции церия трибутилфосфатом (ТБФ) из фосфатных растворов с использованием модельных и производственных растворов, содержащих, %: 26–28 P2O5, 1,2–2,8 SO3, 0,3–0,8 CaO, 0,1–0,4 Al2O3, 0,3–0,4 Fe2O3, 0,09–0,1 РЗМ(NO3)3. Модельный раствор фосфорной кислоты по содержанию P2O5, Се(NO3)3 и значению pH (0,6) соответствовал производственному раствору экстракционной фосфорной кислоты (ЭФК). Получены зависимости показателей экстракции от концентрации ТБФ в о-ксилоле и концентрации нитрат-ионов, вносимых нитратами магния и кальция, используемыми в качестве высаливателя. Определен состав экстрагируемого органического комплекса церия Ce(H2PO4)(NO3)2·ТБФорг. Рассчитаны константа экстракционного равновесия и энергия Гиббса процесса экстракции. По результатам эксперимента сделан вывод о нецелесообразности использования ТБФ для извлечения Се из фосфорно-кислых систем без внесения значительного количества высаливателя.</p></abstract><trans-abstract xml:lang="en"><p>A mechanism of extraction of cerium by tributyl phosphate (TBP) from phosphate solutions using model and production solutions containing, %: 26–28 P2O5, 1,2–2,8 SO3, 0,3–0,8 CaO, 0,1–0,4 Al2O3, 0,3–0,4 Fe2O3, and 0,09–0,1 REM(NO3)3. A model solution of phosphoric acid corresponded to the industrial solution of extraction phosphoric acid (EPA) by the content of P2O5 and Ce(NO3)3 and value of pH (0,6). Dependences of extraction parameters on the TBP concentration in o-xylene and concentration of nitrate ions introduced by magnesium and calcium nitrates, which are used as a salting-out agent, are found. The composition of the extracted organic complex of cerium Ce(H2PO4)(NO3)2·TBPorg is determined. A constant of extraction equilibrium and the Gibbs energy of extraction are calculated. It is concluded by the results of the experiment that it is unreasonable to use TBP to extract Ce from phosphoric acid systems without introducing a considerable amount of the salting-out agent.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>редкоземельные металлы (РЗМ)</kwd><kwd>церий</kwd><kwd>экстракция</kwd><kwd>фосфорнокислые системы</kwd><kwd>трибутилфосфат</kwd><kwd>высаливатель</kwd><kwd>сольватное число</kwd><kwd>Raman-спектры</kwd><kwd>термодинамическое исследование экстракции</kwd><kwd>экстракционная фосфорная кислота (ЭФК).</kwd></kwd-group><kwd-group xml:lang="en"><kwd>rare-earth metals (REM)</kwd><kwd>cerium</kwd><kwd>extraction</kwd><kwd>phosphoric acid systems</kwd><kwd>tributyl phosphate</kwd><kwd>salting-out agent</kwd><kwd>solvate number</kwd><kwd>Raman spectra</kwd><kwd>thermodynamic investigation into extraction</kwd><kwd>extraction phosphoric acid (EPA).</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">Samonov A.E., Samonov A.A. 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