Тип публикации: статья из журнала
Год издания: 2021
Идентификатор DOI: 10.1021/acsomega.1c03187
Аннотация: Characterization of magnetic particulate matter (PM) in coal fly ashes is critical to assessing the health risks associated with industrial coal combustion and for future applications of fine fractions that will minimize solid waste pollution. In this study, magnetic narrow fractions of fine ferrospheres related to environmentally Показать полностьюhazardous PM2.5, PM2.5-10, and PM10 were for the first time separated from fly ash produced during combustion of Ekibastuz coal. It was determined that the average diameter of globules in narrow fractions is 1, 2, 3, and 7 mu m. The major components of chemical composition are Fe2O3 (57-60) wt %, SiO2 (25-28 wt %), and Al2O3 (10-12 wt %). The phase composition is represented by crystalline phases, including ferrospinel, alpha-Fe2O3, epsilon-Fe2O3, mullite, and quartz, as well as the amorphous glass phase. Mossbauer spectroscopy and magnetic measurements confirmed the formation of nanoscale particles of epsilon-Fe2O3. Stabilization of the epsilon-Fe2O3 metastable phase, with quite ideal distribution of iron cations, occurs in the glass matrix due to the rapid cooling of fine globules during their formation from mineral components of coal.
Журнал: ACS OMEGA
Выпуск журнала: Vol. 6, Is. 30
Номера страниц: 20076-20085
ISSN журнала: 24701343
Место издания: WASHINGTON
Издатель: AMER CHEMICAL SOC