The temperature regimes of the thermal extraction method for obtaining silicon dioxide from rice husk and various conditions of subsequent milling were investigated. Elemental, X-ray phase, petrographic analyses, electron and atomic force microscopy, differential scanning calorimetry, and laser granulometry were employed. The appearance of silicon dioxide was observed at a temperature of around 650 ?C, and its structure remained stable during pyrolysis and subsequent heat treatment in the presence of air. After heat treatment at 1000…1100 ?C, cristobalite was the predominant phase.
The milling of the heat-treated products was associated with a significant loss of process efficiency due to the hereditary cellular structure of aggregates and their plastic character of destruction.
Dmitry V. Andreev – Candidate of Technical Sciences, Associate Professor of the Department of Chemical Technology of Ceramics and Refractories, Mendeleev University of Chemical Technology of Russia (Mendeleev University), Moscow, Russia
Artem I. Bezmenov – Associate Professor of the Department of General Silicate Technology, Mendeleev University of Chemical Technology of Russia (Mendeleev University), Moscow, Russia
Alexander I. Zakharov – Doctor of Technical Sciences, Associate Professor, Head of the Department of General Silicate Technology, Mendeleev University of Chemical Technology of Russia (Mendeleev University), Moscow, Russia
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