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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">vestich</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия химических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus, Chemical Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8331</issn><issn pub-type="epub">2524-2342</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-8331-2025-61-3-237-245</article-id><article-id custom-type="elpub" pub-id-type="custom">vestich-969</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>ТЕХНИЧЕСКАЯ ХИМИЯ И ХИМИЧЕСКАЯ ТЕХНОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>TECHNICAL CHEMISTRY AND CHEMICAL ENGINEERING</subject></subj-group></article-categories><title-group><article-title>Исследование растворимости гексафторсиликата натрия в системе Na2SiF6–H3PO4–H2O</article-title><trans-title-group xml:lang="en"><trans-title>Solubility study sodium hexafluorosilicate in the system Na2SiF6–H3PO4–H2O</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>Дормешкин</surname><given-names>О. Б.</given-names></name><name name-style="western" xml:lang="en"><surname>Dormeshkin</surname><given-names>O. B.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дормешкин Олег Борисович – доктор технических наук, профессор, профессор кафедры</p><p>ул. Свердлова, 13а, 220006, Минск</p></bio><bio xml:lang="en"><p>Dormeshkin Oleg B. – D. Sc. (Engineering), Professor, Professor of the Department</p><p>13a, Sverdlov Str., 220006, Minsk</p></bio><email xlink:type="simple">dormeshkin@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>Мохорт</surname><given-names>М. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Mokhart</surname><given-names>M. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мохорт Марк Сергеевич – аспирант</p><p>ул. Свердлова, 13а, 220006, Минск</p></bio><bio xml:lang="en"><p>Mokhart Mark S. – Postgraduate Student</p><p>13a, Sverdlov Str., 220006, Minsk</p></bio><email xlink:type="simple">markmohort@gmail.com</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>Гаврилюк</surname><given-names>A. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Hauryliuk</surname><given-names>A. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гаврилюк Андрей Николаевич – кандидат технических наук, доцент, проректор</p><p>ул. Свердлова, 13а, 220006, Минск</p></bio><bio xml:lang="en"><p>Hauryliuk Andrei N. – Ph. D. (Engineering), Associate Professor, Vice Rector</p><p>13a, Sverdlov Str., 220006, Minsk</p></bio><email xlink:type="simple">gavriluk_andrew@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>Клындюк</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Klyndyuk</surname><given-names>A. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Клындюк Андрей Иванович – кандидат химических наук, доцент, доцент кафедры</p><p>ул. Свердлова, 13а, 220006, Минск</p></bio><bio xml:lang="en"><p>Klyndyuk Andrei I. – Ph. D. (Chemistry), Associate Professor, Associate Professor of the Departmen</p><p>13a, Sverdlov Str., 220006, Minsk</p></bio><email xlink:type="simple">klyndyuk@belstu.by</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>Бышик</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Byshyk</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Бышик Александр Александрович – инженер</p><p>ул. Свердлова, 13а, 220006, Минск</p></bio><bio xml:lang="en"><p>Byshyk Alexander A. – Engineer</p><p>13a, Sverdlov Str., 220006, Minsk</p></bio><email xlink:type="simple">fxguru29@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный технологический университет</institution></aff><aff xml:lang="en"><institution>Belarusian State Technological University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>29</day><month>08</month><year>2025</year></pub-date><volume>61</volume><issue>3</issue><fpage>237</fpage><lpage>245</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Дормешкин О.Б., Мохорт М.С., Гаврилюк A.Н., Клындюк А.И., Бышик А.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Дормешкин О.Б., Мохорт М.С., Гаврилюк A.Н., Клындюк А.И., Бышик А.А.</copyright-holder><copyright-holder xml:lang="en">Dormeshkin O.B., Mokhart M.S., Hauryliuk A.N., Klyndyuk A.I., Byshyk A.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://vestichem.belnauka.by/jour/article/view/969">https://vestichem.belnauka.by/jour/article/view/969</self-uri><abstract><p>Представлены новые научные данные о растворимости гексафторсиликата натрия в системе Na2SiF6–H3PO4–H2O в интервале изменения содержания ортофосфорной кислоты 40–65 мас.% в изотермических и политермических условиях. Установлено снижение растворимости гексафторсиликата натрия в растворах ортофосфорной кислоты, при увеличении ее содержания от разбавленных до концентрированных растворов на всем интервале изменения температуры от 20 до 80 °С. Данное явление, по мнению авторов, обусловлено снижением количества растворителя (H2O) по мере возрастания концентрации кислоты, а также ростом числа молекул воды для гидратации ионов, в частности H5P2O8–, образующихся при диссоциации молекул ортофосфорной кислоты, диполи которых не участвуют в процессе растворения соли. Изменение содержания кислоты оказывает значительно большее влияние на изменение растворимости по сравнению с температурой, что позволило сделать вывод о том, что обесфторивание концентрированных растворов ортофосфорной кислоты предпочтительнее, поскольку позволяет достичь более высокой степени обесфторивания при использовании в качестве осадительного реагента солей щелочных металлов. Анализ представленных данных по влиянию температуры и содержания ортофосфорной кислоты является основанием для последующего выбора оптимальных условий осуществления технологического процесса обесфторивания экстракционной фосфорной кислоты методом осаждения с использованием солей щелочных металлов и прогнозирования достигаемого остаточного содержания фторид-ионов.</p></abstract><trans-abstract xml:lang="en"><p>New scientific data on the solubility sodium hexafluorosilicate in the Na2SiF6–H3PO4–H2O system in the range of changes in the content of orthophosphoric acid 40–65 wt.% under isothermal and polythermal conditions are presented. A decrease in the solubility of sodium hexafluorosilicate in solutions of orthophosphoric acid was established, with an increase in its concentration from dilute to content solutions over the entire range of temperature changes from 20 to 80 °C. This phenomenon, according to the authors, is due to a decrease in the amount of solvent (H2O) as the concentration of the acid increases on the one hand, as well as an increase in the number of water molecules for ion hydration, in particular H5P2O8– formed during the dissociation of orthophosphoric acid molecules, the dipoles of which do not participate in the process of salt dissolution. A change in the content of an acid has a much greater effect on the change in solubility compared to temperature, which led to the conclusion that defluorination of concentrated solutions of orthophosphoric acid is more preferable, since it allows to achieve a higher degree of defluorination when using alkali metal salts as a precipitating reagent. The analysis of the presented data on the effect of temperature and content of orthophosphoric acid is the basis for the subsequent selection of optimal conditions for the technological process of defluorination of extractive phosphoric acid by the method of precipitation using alkali metal salts and the prediction of the achieved residual content of fluoride ions.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>ортофосфорная кислота</kwd><kwd>кремнефторид натрия</kwd><kwd>фтор-ион</kwd><kwd>растворимость</kwd><kwd>обесфторивание</kwd><kwd>изотермы</kwd><kwd>политермы</kwd><kwd>равновесие</kwd><kwd>кинетика</kwd></kwd-group><kwd-group xml:lang="en"><kwd>orthophosphoric acid</kwd><kwd>sodium hexafluorosilicate</kwd><kwd>fluoro-ion</kwd><kwd>solubility</kwd><kwd>defluorination</kwd><kwd>isotherms</kwd><kwd>polytherms</kwd><kwd>equilibrium</kwd><kwd>kinetics</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках Государственной программы научных исследований «Химические процессы, реагенты и технологии, биорегуляторы и биооргхимия» (задание 2.1.9, №  20240816).</funding-statement><funding-statement xml:lang="en">The work was carried out within the framework of the State Scientific Research Program “Chemical Processes, Reagents and Technologies, Bioregulators and Bioorganic Chemistry” (task 2.1.9, No. 20240816).</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">Мировой рынок кормовых фосфатов – тенденции отрасли и прогноз до 2029 года. – URL: https://www.databridgemarketresearch.com/ru/reports/global-feed-phosphates-market (дата обращения: 24.01.2025).</mixed-citation><mixed-citation xml:lang="en">Global Feed Phosphate Market – Industry Trends and Forecast to 2029. 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