光谱学与光谱分析, 2020, 40 (5): 1452, 网络出版: 2020-12-09  

古交飞灰不同粒径颗粒的XRD及FTIR研究

Research on XRD and FTIR Spectra of Fly Ash in Different Particle Size from Gujiao Power Plant
刘云霞 1,2曾凡桂 1,2,*孙蓓蕾 1,2贾鹏 1,2
作者单位
1 太原理工大学地球科学与工程系, 山西 太原 030024
2 煤与煤系气地质山西省重点实验室, 山西 太原 030024
摘要
我国每年产生大量的粉煤灰, 不同粒径的粉煤灰在处置利用方面存在较大差异。 为探究不同粒径粉煤灰物质组成及结构的差异, 选取古交飞灰为研究对象, 将其筛分成8个粒度级别, 运用X射线衍射(XRD)及傅里叶变换红外光谱(FTIR)表征。 结果表明: XRD图谱显示古交飞灰主要物质组成为非晶相玻璃体(61.93%~74.76%), 莫来石(20.45%~29.59%)与少量石英(1.23%~5.64%)。 随着粒径的增加, 莫来石含量降低, 石英含量先增加后降低, 而玻璃体呈现整体上升的趋势。 FTIR图谱显示Si—O(Si, Al)反对称伸缩振动峰为主要化学键(58.86%~67.39%), 其次为Si—O—(Si)弯曲振动(15.28%~21.40%), Si—O—Si对称伸缩振动(6.18%~9.67%), Si—O—(Al)对称伸缩振动(0.79%~4.02%)。 随着粒径的增加, Si—O(Si, Al)反对称伸缩振动相对增加, Si—O—(Si)弯曲振动降低, 而Si—O—Si对称伸缩振动与Si—O—(Al)对称伸缩振动波有明显变化规律。 FTIR中Si—O(Si, Al)反对称伸缩振动峰主要为飞灰中的玻璃体的吸收峰, 其相对含量随着粒度的增加而增加与XRD定量所得玻璃体含量变化趋势整体一致。 464 cm-1附近石英的Si—O—(Si)弯曲振动, 1 090 cm-1附近石英的Si—O—Si反对称伸缩振动相对含量的变化趋势与XRD定量所得石英百分含量的结果基本一致。 不同粒飞灰中莫来石556 cm-1处强吸收峰的相对含量(y)与XRD计算所得莫来石含量(x%)呈线性关系: y=0.396x-1.997, R2=0.868。
Abstract
A large amount of fly ash is produced every year in China, and there are big differences in the disposal and utilization of fly ash with different particle size. In order to explore the differences in the composition and structure of fly ash with different particle size, Gujiao fly ash was selected as the research object, and sieved into 8 size fractions. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) was used to characterize the samples. XRD pattern shows that the dominant phase is amorphous glass (61.93%~74.76%), mullite (20.45%~29.59%) and a small amount of quartz (1.23%~5.64%). As the particle size increases, the mullite content decreases, the quartz content increases first and then decreases, and the glass exhibits an overall upward trend. FTIR shows that Si—O (Si, Al) asymmetric stretching vibration is main chemical bond (58.86%~67.39%), which is mainly provided by aluminosilicate in glass, followed by Si—O—(Si) bending vibration (15.28%~21.49%), Si—O—Si symmetric stretching vibration (6.18%~9.67%), and Si—O—(Al) symmetric stretching vibration (0.79%~4.02%). With the increase of particle size, the relative content of Si—O(Si, Al) asymmetric stretching vibration increases, Si—O—(Si) bending vibration decreases, while Si—O—Si symmetric stretching vibration and Si—O—(Al) symmetric stretching vibration does not show an obvious change trend. The relationship between XRD content and FTIR chemical bond content shows as Si—O (Si, Al) asymmetric stretching vibration is the main absorption peak of glass, and the content of this band increase with particle size is consistent with the increase of glass obtained by XRD. For quartz, the content got by XRD quantification in different size fractions are also same with the changing trend of the Si—O—(Si) bending vibration near 464 cm-1 and Si—O—Si asymmetric stretching vibration near 1 090 cm-1. The relative content of the strong absorption peak at 556 cm-1 of mullite (y) obtained by FTIR and the mullite content (x%) obtained by XRD shows a linear relationship as y=0.396x-1.997 with 0.868 for R2.

刘云霞, 曾凡桂, 孙蓓蕾, 贾鹏. 古交飞灰不同粒径颗粒的XRD及FTIR研究[J]. 光谱学与光谱分析, 2020, 40(5): 1452. LIU Yun-xia, ZENG Fan-gui, SUN Bei-lei, JIA Peng. Research on XRD and FTIR Spectra of Fly Ash in Different Particle Size from Gujiao Power Plant[J]. Spectroscopy and Spectral Analysis, 2020, 40(5): 1452.

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