燃料化学学报2017，Vol.45Issue(11)：1296-1302,7.
高硅煤中Si-Al-Fe-Ca四元体系碳热反应研究
Carbothermal reduction of Si-Al-Fe-Ca quaternary system in a high-silica coal
摘要
Abstract
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 Fe2 O3 plays a positive role in carbothermal reaction of silicon-bearing minerals, which could effectively improve activity of Si. On the contrary, CaO reacts with Al2 O3 and SiO2 to form dense Ca-Al-Si eutectic, mainly CaAl2 Si2 O8 , at lower temperature, covering surface of the reactant, which hinders the carbothermal reaction of silicon-containing minerals. With increasing temperature, CaAl2 Si2 O8 reacts with graphite to generate SiC, CaAl4 O7 and CaSiO3 . The related thermodynamic calculations are in accordance with the experiment results.关键词
高硅煤/Si-Al-Fe-Ca四元体系/含硅矿物/碳热反应Key words
high-silica coal/Si-Al-Fe-Ca quaternary system/silicon-containing mineral/carbothermal reduction分类
化学化工引用本文复制引用
雍其润,龚本根,赵永椿,张军营..高硅煤中Si-Al-Fe-Ca四元体系碳热反应研究[J].燃料化学学报,2017,45(11):1296-1302,7.基金项目
The project was supported by the National Natural Science Foundation of China(41672148, U1510201).国家自然科学基金(41672148,U1510201)资助 （41672148, U1510201）
