The Chemical Transformation of Calcium in Shenhua Coal During Combustion in a Muffle Furnace
The chemical reaction characteristics of calcium in three samples of Shenhua coal,I.e.raw sample,hydrochloric acid washed sample and hydrochloric acid washed light fraction,during combustion in a muffle furnace have been investigated in this paper.Ca is bound by calcite and organic matter in Shenhua coal.X ray diffraction (XRD) phase analysis has been conducted to these samples combustion products obtained by heating at different temperatures.It has been found that the organicallybound calcium could easily react with clays and transform into gehlenite and anorthite partially if combusted under 815 °C,whilst the excluded minerals promoted the conversion of gehlenite to anorthite.Calcite in Shenhua coal decomposed into calcium oxide and partially transformed into calcium sulfate under 815℃,and formed gehlenite and anorthite under 1050 °C.Calcite and other HCl-dissolved minerals in Shenhua coal were responsible mainly for the characteristic that the clay minerals in Shenhua coal hardly became mullite during combustion.
ash deposition Shenhua coal chemical forms of calcium mullite X-ray diffraction
Tian Sida Zhuo Yuqun Shu Xinqian Chen Changhe
Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Educatio Key laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Ther School of Chemical and Environmental Engineering,China University of Mining and Technology (Beijing) Key laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Ther
国际会议
The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)
哈尔滨
英文
113-116
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）