Cristobalite formation from the thermal treatment of amorphous silica fume recovered from the metallurgical silicon industry
- Author(s): Shipeng Zhang 1 ; Shengnian Tie 1 ; Fenjuan Zhang 2
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View affiliations
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Affiliations:
1:
New Energy (photovoltaic) Industry Research Center, Qinghai University , Xining 810016 , People's Republic of China ;
2: Qinghai Province Product Quality Supervision and Inspection Center , Xining 810016 , People's Republic of China
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Affiliations:
1:
New Energy (photovoltaic) Industry Research Center, Qinghai University , Xining 810016 , People's Republic of China ;
- Source:
Volume 13, Issue 10,
October
2018,
p.
1465 – 1468
DOI: 10.1049/mnl.2018.5167 , Online ISSN 1750-0443
Silica fume was thermally treated to 700–1100°C in air to transform it into crystals and cause it to reach the metastable cristobalite state. The phase transition behaviour of the silica fume crystallisation process and the main factors influencing the crystallisation behaviour were investigated via thermogravimetry differential thermal analysis, X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy. The results show that when the treatment temperature reaches 800°C, the silica fume undergoes a displacive phase transformation and begins to nucleate. At 1100°C, the silica fume fully converts to cristobalite. Alkali metal impurity compounds in the silica fume promote the phase transformation of silica fume.
Inspec keywords: minerals; Fourier transform infrared spectra; heat treatment; nucleation; impurities; X-ray diffraction; scanning electron microscopy; silicon compounds; displacive transformations; crystallisation; amorphous state; differential thermal analysis
Other keywords: alkali metal impurity compounds; metallurgical silicon industry; Fourier-transform infrared spectroscopy; displacive phase transformation; temperature 700 degC to 1100 degC; nucleation; thermal treatment; scanning electron microscopy; amorphous silica fume; X-ray diffraction; thermogravimetry differential thermal analysis; SiO2; metastable cristobalite state; silica fume crystallisation process
Subjects: Nucleation in phase transitions; Solid-solid transitions; Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder; Infrared and Raman spectra in inorganic crystals; Other heat and thermomechanical treatments
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