Рис. 4 - СЭМ-снимки немагнитных дисперсных узких фракций: a - МФ136НМ, б - МФ137НМ, в - МФ141НМ, г - МФ140НМ
С ростом размера фракции количество микросфер с пористой оболочкой монотонно увеличивается, составляя во фракции МФ137НМ (рис. 3б) около 15%, во фракции МФ141НМ (рис. 3в) достигает 30%. Для самой крупной фракции МФ140НМ (рис. 3г) содержание пористых частиц становится преобладающим: количество микросфер с пористой оболочкой составляет уже более половины, дополнительно в количестве ~10% содержатся частицы сетчатой структуры. Осколки, представляющие собой фрагменты разрушенных крупных частиц, которые практически не подверглись плавлению, либо незначительно оплавлены, содержатся во всех фракциях.
Охарактеризованные дисперсные зольные фракции соответствуют определенным требованиям к размеру частиц, химическому и фазовому составу, могут быть успешно использованы для получения материалов с прогнозируемыми и воспроизводимыми свойствами, например, в качестве добавки в бетоны [21], для получения керамических мембранных подложек [24], огнестойких панелей [25], наполнителя в полимеры [26], что приведет к снижению общих объемов золошлаковых отходов.
Список литературы
дисперсный зола минеральный
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