Article hydrothermal co-processing of coal fly ash cenospheres and soluble sr(Ii) as environmentally sustainable approach to sr-90 immobilization in a mineral-like form

Описание

Тип публикации: статья из журнала

Год издания: 2021

Идентификатор DOI: 10.3390/ma14195586

Ключевые слова: analcime, cenospheres, mineral-like phase, sr-90, sr-plagioclase, sr-tobermorite

Аннотация: Co-processing of radioactive effluents with coal fly ash-derived materials is recognized as a resource-saving approach for efficient stabilization/solidification of radioactive components of wastewater. In this context, the paper is focused on the hydrothermal synthesis of Sr2+-bearing aluminosilicate/silicate phases as analogs of Показать полностьюa mineral-like90Sr waste form using hollow glass-crystalline aluminosilicate microspheres from coal fly ash (cenospheres) as a glassy source of Si and Al (SiO2-Al2O3)glass) and Sr(NO3)2 solutions as90Sr simulant wastewater. The direct conversion of cenosphere glass in the Sr(NO3)2-NaOH-H2O-(SiO2-Al2O3)glass system as well as Sr2+ sorption on cenosphere-derived analcime (ANA) in the Sr(NO3)2-H2O-ANA system were studied at 150–200◦C and autogenous pressure. The solid and liquid reaction products were characterized by SEM-EDS, PXRD, AAS and STA. In the Sr(NO3)2-NaOH-H2O-(SiO2-Al2O3)glass system, the hydrothermal processing at 150–200◦C removes 99.99% of the added Sr2+ from the solution by forming Sr-tobermorite and Sr-plagioclase phases. In the Sr(NO3)2-H2O-ANA system, Sr2+ sorption on analcime results in the formation of solid solutions (Na1−nSrn/2)AlSi2O6·H2O of the Na-analcime–Sr-wairakite series. The results can be considered as a basis for the development of environmentally sustainable technology for90Sr removal from wastewater and immobilization in a mineral-like form by co-processing waste from coal-fired and nuclear power plants. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

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Издание

Журнал: Materials

Выпуск журнала: Vol. 14, Is. 19

Номера страниц: 5586

ISSN журнала: 19961944

Издатель: MDPI

Персоны

  • Vereshchagina Tatiana (Russian Acad Sci, Fed Res Ctr, Krasnoyarsk Sci Ctr, Siberian Branch,Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia)
  • Kutikhina Ekaterina (Russian Acad Sci, Fed Res Ctr, Krasnoyarsk Sci Ctr, Siberian Branch,Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia)
  • Solovyov Leonid (Russian Acad Sci, Fed Res Ctr, Krasnoyarsk Sci Ctr, Siberian Branch,Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia)
  • Vereshchagin Sergei (Russian Acad Sci, Fed Res Ctr, Krasnoyarsk Sci Ctr, Siberian Branch,Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia)
  • Mazurova Elena (Russian Acad Sci, Fed Res Ctr, Krasnoyarsk Sci Ctr, Siberian Branch,Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia)
  • Anshits Alexander (Russian Acad Sci, Fed Res Ctr, Krasnoyarsk Sci Ctr, Siberian Branch,Inst Chem & Chem Technol, 50-24 Akademgorodok, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Dept Chem, Svobodny Ave 79, Krasnoyarsk 660041, Russia)