- Title
- A DSC study on the impact of low-temperature oxidation on the behavior and drying of water in lignite
- Creator
- Rish, Salman Khoshk; Tahmasebi, Arash; Yu, Jianglong
- Relation
- Journal of Thermal Analysis and Calorimetry Vol. 139, Issue 6, p. 3507-3517
- Publisher Link
- http://dx.doi.org/10.1007/s10973-019-08749-w
- Publisher
- Akademiai Kiado Rt
- Resource Type
- journal article
- Date
- 2020
- Description
- Low-rank coals may undergo low-temperature oxidation and self-heating during mining, freightage, and handling. The oxidation of coal changes its structure which will be relected in the behaviour of coal water. A differential scanning calorimetry study was conducted to investigate the impact of low-temperature oxidation on the nature of water in a Chinese lignite and its drying behavior. The lignite sample was oxidized in the air at temperatures of 30-180 ℃. The results showed that the lignite samples that underwent low-temperature oxidation did not contain any freezable bound water. It was found that the amount of non-freezable water in the oxidized samples reached the highest value of 67.38 mass% after oxidation at 80 ℃. The Fourier transform infrared spectroscopy and the static sessile drop analysis results suggested that the concentration of oxygen functionalities and hydrophilicity of lignite samples peaked after oxidation at 80 ℃, which in turn increased the tendency for the absorption of water as non-freezable water. It was also found that the types of water in the oxidized samples had a profound impact on its drying behavior, where free water showed higher drying rates compared with freezable bound water and non-freezable water. The coal sample pre-oxidized at 80 ℃ required higher energy for pre-drying compared with the raw coal, which was attributed to the higher proportion of non-freezable water after oxidation.
- Subject
- lignite; low-temperature oxidation; freezable water; non-freezable water; DSC
- Identifier
- http://hdl.handle.net/1959.13/1424910
- Identifier
- uon:38164
- Identifier
- ISSN:1388-6150
- Language
- eng
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