Chemical leaching of an Indian bituminous coal and characterization of the products by vibrational spectroscopic techniques |
| |
| Authors: | B Manoj A G Kunjomana |
| |
| Affiliation: | 1.Department of Physics,Christ University,Bangalore-29,India;2.Research and Development Centre,Bharathiar University,Coimbatore,India |
| |
| Abstract: | High volatile bituminous coal was demineralized by a chemical method. The vibrations of the “aromatics” structure of graphite,
crystalline or non-crystalline, were observed in the spectra at the 1600 cm−1 region. The band at 1477 cm−1 is assigned as VR band, the band at 1392 cm−1 as VL band and the band at 1540 cm−1 as GR band. Graphite structure remains after chemical leaching liberates oxygenated functional groups and mineral groups. The silicate
bands between 1010 and 1100 cm−1 are active in the infrared (IR) spectrum but inactive in the Raman spectrum. Absorption arising from C-H stretching in alkenes
occurs in the region of 3000 to 2840 cm−1. Raman bands because of symmetric stretch of water molecules were also observed in the spectrum at 3250 cm−1 and 3450 cm−1. Scanning electron microscopy analysis revealed the presence of a graphite layer on the surface. Leaching of the sample with
hydrofluoric acid decreases the mineral phase and increases the carbon content. The ash content is reduced by 84.5wt% with
leaching from its initial value by mainly removing aluminum and silicate containing minerals. |
| |
| Keywords: | |
| 本文献已被 万方数据 SpringerLink 等数据库收录！ |
| 点击此处可从《矿物冶金与材料学报》浏览原始摘要信息 |
|
点击此处可从《矿物冶金与材料学报》下载全文 |
|
