Alteration behavior of mineral structure and hazardous elements during combustion of coal from a power plant at Huainan, Anhui, China. (August 2018)

• Record Type: Journal Article
• Authors: Tang, Quan; Sheng, Wanqi; Li, Liyuan; Zheng, Liugen; Miao, Chunhui; Sun, Ruoyu
• Is Part Of: Environmental pollution. Volume 239(2018)
• Page Start: 768
• Page End: 776
• Publication Date: 2018-08
• Subjects: Hazardous elements -- Coal -- Minerals -- Alteration behavior -- Combustion; Pollution -- Periodicals; Pollution -- Environmental aspects -- Periodicals; Environmental Pollution -- Periodicals; Pollution -- Périodiques; Pollution -- Aspect de l'environnement -- Périodiques; Pollution -- Effets physiologiques -- Périodiques; Pollution; Pollution -- Environmental aspects; Periodicals; Electronic journals; 363.73
• DOI: 10.1016/j.envpol.2018.04.115
• Languages: English
• ISSNs: 0269-7491

Abstract

Abstract: The alteration behavior of minerals and hazardous elements during simulated combustion (100–1200 °C) of a raw coal collected from a power plant were studied. Thermogravimetric analysis indicated that there were mainly four alteration stages during coal combustion. The transformation behavior of mineral phases of raw coal, which were detected by X-ray polycrystalline diffraction (XRD) technique, mainly relied on the combustion temperature. A series of changes were derived from the intensities of mineral (e.g. clays) diffraction peaks when temperature surpassed 600 °C. Mineral phases tended to be simple and collapsed to amorphous glass when temperature reached up to 1200 °C. The characteristics of functional groups for raw coal and high-temperature (1200 °C) ash studied by Fourier transform infrared spectroscopy (FTIR) were in accordance with the result obtained from XRD analysis. The volatilization ratios of Co, Cr, Ni and V increased consistently with the increase of combustion temperature, suggesting these elements were gradually released from the organic matter and inorganic minerals of coal. Graphical abstract: Image 1 Highlights: The alteration behavior of minerals and hazardous elements during simulated combustion of a raw coal were studied. Mineral phases in high-temperature ash tended to be simple and collapsed to amorphous glass. The volatilization ratios of Co, Cr, Ni and V increased consistently with the increase of combustion temperature.