Citation: YONG Qi-run, GONG Ben-gen, ZHAO Yong-chun, ZHANG Jun-ying. Carbothermal reduction of Si-Al-Fe-Ca quaternary system in a high-silica coal[J]. Journal of Fuel Chemistry and Technology, ;2017, 45(11): 1296-1302. shu

Carbothermal reduction of Si-Al-Fe-Ca quaternary system in a high-silica coal

State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, China

Corresponding author: ZHANG Jun-ying, jyzhang@hust.edu.cn
Received Date: 31 May 2017
Revised Date: 18 July 2017

Fund Project: the National Natural Science Foundation of China 41672148the National Natural Science Foundation of China U1510201The project was supported by the National Natural Science Foundation of China(41672148, U1510201)

Figures(6)

During coal pyrolysis and gasification, the minerals in coal undergo various transformations, which affects coal conversion and characteristics of coal ash obviously. Carbothermal reduction of Si-Al-Fe-Ca quaternary system in high-silica coal under different temperature was investigated. Composition of products obtained was analyzed by X-ray diffraction (XRD) and field emission scanning electron microscope-energy dispersive spectrometer (FESEM-EDS) technology. The results show that Fe₂O₃ plays a positive role in carbothermal reaction of silicon-bearing minerals, which could effectively improve activity of Si. On the contrary, CaO reacts with Al₂O₃ and SiO₂ to form dense Ca-Al-Si eutectic, mainly CaAl₂Si₂O₈, at lower temperature, covering surface of the reactant, which hinders the carbothermal reaction of silicon-containing minerals. With increasing temperature, CaAl₂Si₂O₈ reacts with graphite to generate SiC, CaAl₄O₇ and CaSiO₃. The related thermodynamic calculations are in accordance with the experiment results.
- high-silica coal,
- Si-Al-Fe-Ca quaternary system,
- silicon-containing mineral,
- carbothermal reduction
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