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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">10.29235/1561-8331-2021-57-3-310-319</article-id><article-id custom-type="elpub" pub-id-type="custom">vestich-667</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>НЕОРГАНИЧЕСКАЯ ХИМИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>INORGANIC CHEMISTRY</subject></subj-group></article-categories><title-group><article-title>Особенности синтеза высокодисперсных алюмофосфатов состава AlPO 4·nH2O</article-title><trans-title-group xml:lang="en"><trans-title>Features of the synthesis of highly dispersed alumophosphates AlPO4·nH2O</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>Ещенко</surname><given-names>Л. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Eshchenko</surname><given-names>L. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ещенко Людмила Семеновна – д-р техн. наук, профессор</p><p>ул. Свердлова 13а, 220006, Минск</p></bio><bio xml:lang="en"><p>Lyudmila S. Eshchenko – D. Sc. (Engineering), Professor</p><p>13a, Sverdlova Str., 220006, Minsk </p></bio><email xlink:type="simple">yeshchanko@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>Понятовский</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Paniatouski</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Понятовский Олег Витальевич – магистр</p><p>ул. Свердлова 13а, 220006, Минск</p></bio><bio xml:lang="en"><p>Aleh V. Paniatouski – M. Sc. </p><p>13a, Sverdlova Str., 220006, Minsk </p></bio><email xlink:type="simple">oleg.ponyatovskiy@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>2021</year></pub-date><pub-date pub-type="epub"><day>03</day><month>09</month><year>2021</year></pub-date><volume>57</volume><issue>3</issue><fpage>310</fpage><lpage>319</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ещенко Л.С., Понятовский О.В., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Ещенко Л.С., Понятовский О.В.</copyright-holder><copyright-holder xml:lang="en">Eshchenko L.S., Paniatouski A.V.</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/667">https://vestichem.belnauka.by/jour/article/view/667</self-uri><abstract><p>Методом конденсации при гидротермальной обработке алюмофосфатных растворов с концентрацией (г/л) Al2O3 90 – 115, P2O5 340 – 440 в интервале температур 95–99 °C получен ортофосфат алюминия состава AlPO 4·2H2O с моноклинной структурой, идентичной структуре природного минерала метаварисцита. Впервые установлена роль старения алюмофосфатной системы в сокращении индукционного периода, одновременном зарождении первичных частиц во всем объеме раствора и образовании пастообразного продукта c преобладающим размером частиц 1–10 мкм в отличие от 30–50 мкм, характерного для мелкокристаллического, получаемого без старения раствора. Показано, что пастообразный AlPO4·2H2O, по сравнению с мелкокристаллическим, является труднорастворимым в HCl даже при длительном нагревании. Установлено влияние содержания P2O5 в алюмофосфатном растворе, условий его старения, продолжительности гидротермальной обработки на распределение частиц по размерам для синтезируемых ортофосфатов алюминия. Безводный алюмофосфат, полученный дегидратацией пастообразного AlPO 4·2H2O в интервале 150–200 °C с последующей термообработкой при 900 °C, хорошо растворим в кислотах, преобладающий размер частиц составляет 5–13 мкм.</p></abstract><trans-abstract xml:lang="en"><p>Aluminum orthophosphate of the composition AlPO4·2H2O with a monoclinic structure identical to the structure of the natural mineral metavariscite was obtained by condensation method during hydrothermal treatment of alumophosphate solutions with a concentration (g/l) of Al2O3 90 – 115, P2O5 340 – 440 in the temperature range 95–99 °C. For the first time, the role of aging of the alumophosphate system in shortening of the induction period, simultaneous nucleation of primary particles in the entire volume of the solution and the formation of a pasty product with a predominant particle size of 1–10 μm, in contrast to 30–50 μm, characteristic of a fine-crystalline product obtained without aging of the solution, is established. It is shown that pasty AlPO4·2H2O, in comparison with fine-crystalline, is hardly soluble in HCl even under prolonged heating. The influence of P2O5 content in the alumophosphate solution, the conditions of its aging and the duration of hydrothermal treatment on the particle size distribution for synthesized aluminum orthophosphates have been established. Anhydrous alumophosphate obtained by dehydration of pasty AlPO4·2H2O in the temperature range of 150–200 °C with subsequent heat treatment at 900 °C is readily soluble in acids, and the predominant particle size is 5–13 μm.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гидратированный ортофосфат алюминия</kwd><kwd>гидротермальная обработка</kwd><kwd>кристаллизация</kwd><kwd>фазообразование</kwd><kwd>безводный алюмофосфат</kwd><kwd>дисперсность</kwd><kwd>распределение частиц по размерам</kwd></kwd-group><kwd-group xml:lang="en"><kwd>hydrated aluminum orthophosphate</kwd><kwd>hydrothermal treatment</kwd><kwd>crystallization</kwd><kwd>phase formation</kwd><kwd>anhydrous alumophosphate</kwd><kwd>dispersion</kwd><kwd>particle size distribution</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">Гребенько, Н. В. 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