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Thermogravimetric analysis of selected coal-bearing strata kaolinite

By Ray L. Frost, Hongfei Cheng and Jing Yang

Abstract

Two kinds of coal-bearing kaolinite from China were analysed by X-ray diffraction (XRD), Thermogravimetric analysis-mass spectrometry (TG-MS), infrared emission spectroscopy. Thermal decomposition occurs in a series of steps attributed to (a) desorption of water at 68 °C for Datong coal bearing strata kaolinite and 56 °C for Xiaoxian with mass losses of 0.36 % and 0.51 % (b) decarbonization at 456 °C for Datong coal bearing strata kaolinite and 431 °C for Xiaoxian kaolinite, (c) dehydroxylation takes place in two steps at 589 and 633 °C for Datong coal bearing strata kaolinite and at 507 °C and 579 °C for Xiaoxian kaolinite. This mineral were further characterised by infrared emission spectroscopy (IES). Well defined hydroxyl stretching bands at around 3695, 3679, 3652 and 3625 cm-1 are observed. At 650 °C all intensity in these bands is lost in harmony with the thermal analysis results. Characteristic functional groups from coal are observed at 1918, 1724 and 1459 cm-1. The intensity of these bands decrease by thermal treatment and is lost by 700 °C

Topics: 030199 Analytical Chemistry not elsewhere classified, 030600 PHYSICAL CHEMISTRY (INCL. STRUCTURAL), 030603 Colloid and Surface Chemistry, 030606 Structural Chemistry and Spectroscopy, Thermal analysis; thermogravimetry, Coal-bearing; Kaolinite; infrared emission spectroscopy
Publisher: Elseiver BV
Year: 2010
DOI identifier: 10.1016/j.tca.2010.05.004
OAI identifier: oai:eprints.qut.edu.au:33649

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