Citation: YIN Yan-shan, ZHANG Yi, CHEN Hou-tao, LIU Liang, YAN Xiao-zhong, CHEN Dong-lin. Characterization of mineral matters and carbonaceous structure of high-ash coals by vibrational spectroscopy[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(10): 1167-1175. shu

Characterization of mineral matters and carbonaceous structure of high-ash coals by vibrational spectroscopy

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1. School of Energy & Power Engineering, Key Laboratory of Renewable Energy Electric-Technology of Hunan Province, Changsha University of Science & Technology, Changsha 410114, China;

Corresponding author: YIN Yan-shan,
Received Date: 26 February 2015
Available Online: 3 June 2015
Fund Project: 国家自然科学基金青年科学基金(51206012) (51206012)湖南省高等学校科学研究项目(12C0005) (12C0005)可再生能源电力技术湖南省重点实验室开放基金(2012ZNDL005)资助项目 (2012ZNDL005)

Mineral matters and carbonaceous structure of both raw and acid-washed Guangxi Heshan (GX) and Pingdingshan (PD) coals were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Raman spectroscopy and X-ray diffraction (XRD). The FT-IR spectra demonstrate that the two raw coals are most abundant in kaolinite, followed by quartz and calcite. Some new mineral matters such as muscovite, serpentine, gypsum and alkali-feldspar are clearly observed from the second derivative FT-IR spectra. In addition, three OH stretching vibration peaks are shown in the FT-IR spectra at 3 695, 3 651 and 3 619 cm^-1, indicating that the kaolinite in coals is not well crystallized. For demineralized coals, aromatic C=C peak (1 600 cm^-1) and (002) diffraction peak of microcrystalline carbon are obviously shown in FT-IR and XRD spectra, respectively. In the case of raw coals, both FT-IR and XRD spectra show that the carbonaceous structure is almost completely inhibited by mineral matters. However, the defect carbon (D peak) and graphite carbon (G peak) are clearly found in the Raman spectra for both raw and acid-washed coals, since the mineral matters are completely inhibited by carbon due to more intensive signal. The crystalline carbon is found to be slightly less ordered for demineralized coals than for raw coals, and therefore the carbonaceous structure is slightly affected by acid treatment.
- Fourier transform infrared spectroscopy,
- Raman spectroscopy,
- high-ash coals,
- mineral matters,
- carbonaceous structure
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