Библиографическое описание:SPS fabrication of mineral-like ceramics sourced by coal fly ash microspheres for 137Cs ultimate disposal in igneous rocks : научное издание / Tatiana A. Vereshchagina [et al.]. - Текст : непосредственный // Journal of Environmental Management. - 2026. - Т.399, №. - P. 128626. - This study was carried out with financial support from the State Assignment of the Ministry of Science and Higher Education of the Russian Federation - Project No. FWES-2026–0011 for the Institute of Chemistry and Chemical Technology, FRS “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences” (synthesis and physicochemical characterization of microsphere-based powder precursors) and Topic No. FZNS-2023–0003 for the Far East Federal University (synthesis and physicochemical investigation of ceramics). The equipment of the joint Center for Collective Use, the interdisciplinary center in the field of nanotechnology and new functional materials of the FEFU, laboratory of magnetism and laboratory of film technologies of the FEFU were used in the work (Vladivostok, Russia). - ISSN 0301-4797. - ISSN 1095-8630, DOI 10.1016/j.jenvman.2026.128626.
Аннотация:The novel approach to high-tech application of CFA particulate matter (PM, dispersed microspheres) generated at coal-burning thermal power plants was highlighted as a resource-saving and energy-efficient method to solidify 135,137Cs-bearing radioactive waste in mineral-like ceramics based on feldspathoid phases suitable for disposal in igneous rocks. The specific novelty of using dispersed microspheres lies in their size (<10 μm), which is a key technological variable in ceramic production. The combination of fine particle sizing with required composition (SiO2/Al2O3 = 1.2−3.5) was a prerequisite for PM involvement in 135,137Cs ceramization. To fabricate initial precursors, two microsphere fractions (PM2.5 and PM10) having close SiO2/Al2O3 ratios (2.2 and 2.7) but different size distributions (dmax of 2.5 and 9.9 μm) were isolated from CFA by applying aerodynamic and magnetic classifications. The Cs-bearing aluminosilicate precursors (Cs-PM2.5 and Cs-PM10) were prepared by impregnation of the microspheres with CsNO3 solution followed by drying and calcination at 800 °C. To fabricate ceramics, the Cs-PM blends were consolidated by the spar plasma sintering (SPS) at 700, 800 and 900 °C and pressure of 30 MPa. The PXRD, SEM-EDS analyses, measurements of density and Vickers microhardness, evaluation of the cesium leaching rate were performed to characterize the resulted ceramic materials. As established, the SPS fabricated ceramics for both precursors is the high-density (2.7−2.9 g/cm3) material composed of pollucite and Cs-kalsilite phases. Its hydrolytical stability is confirmed by the low cesium leaching rates (R ∼ 10−5−10−6 g/cm2⋅day), which meets the requirements of GOST R 50,926–96 and NP-019-2000 standards for solidified high-level waste.
Держатель оригинала документа:Far Eastern Federal University, Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, Siberian Federal University
Количество экземпляров:
Твёрдая копия издания отсутствует в фонде библиотеки
