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- Title
Characteristics and phase transformation behavior of quartzites.
- Authors
Mao Shengxiao; Jia Zhenggang; Li Bing; Yuan Wenjie
- Abstract
Three kinds of quartzites from different regions were crushed, ground, shaped, dried and fired at different temperatures (1 350,1 450 and 1 550 °C) for 2 h. The quartzites powders were investigated in terms of the infrared spectrum, the particle size distribution, and the microstructure. The fired specimens were tested in terms of the phase composition, the true density and the linear change rate. The results show that: (1) the grain size distribution of quartzite from different regions is different; there both exist fine grains of more than ten microns and coarse grains of hundreds of microns; (2) under the same crushing and grinding conditions, the quartzite with smaller average size has small particle size and presents a bimodal distribution, while the quartzite with larger average size has large particle size and presents a multi-modal distribution; (3) the phase transformation rate of the quartzites is affected by both the impurity content and the crystal grain size; and the transformation rate of crystalline quartzite is relatively fast.
- Subjects
PHASE transitions; PARTICLE size distribution; QUARTZITE; INFRARED spectra; POWDERS
- Publication
Refractories / Naihuo Cailiao, 2022, Vol 56, Issue 4, p299
- ISSN
1001-1935
- Publication type
Article
- DOI
10.3969/j.issn.1001-1935.2022.04.05