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Received February 4, 2012
Accepted October 9, 2012
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Mineral behavior of low-temperature lignite ashes under gasification atmosphere

School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China 1Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
Korean Journal of Chemical Engineering, March 2013, 30(3), 605-612(8), 10.1007/s11814-012-0176-z
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Abstract

To investigate the mineral behavior of lignite ashes under gasification conditions, 450 ℃Xiaolongtan lignite ash samples (XLT-LTA) treated at different temperatures or pressures under reducing atmosphere (H2/CO2=1 : 1, volume ratio) have been examined by means of an SC-444 apparatus, a scanning electron microscope with an energy dispersive X-ray detector (SEM-EDX), and by X-ray diffraction (XRD). The results showed the sulfur content in the XLT-LTA_x000D_ to be much higher than that in ashes prepared at 815 ℃, as a result of the release of sulfur dioxide during the oxidization of pyrite. With increasing temperature, the XLT-LTA particles gradually agglomerate and form partially molten surface entities with obvious apertures, and the content of iron and calcium in the congeries or molten parts increases due to the fusion of fine ash particles with the enrichment of iron and the formation of low-temperature eutectics of calcium and iron. An increase of pressure restrains the decomposition of calcite and muscovite, and promotes the formation of iron minerals (e.g., hercynite, cordierite, and sekaninaite) and orthoclase. The content of amorphous material also increases with increasing pressure.

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