文献类型：期刊文献

英文题名：Physico-Chemical Characteristics and Mineral Transformation Behavior of Ashes from Crop Straw

作者：Wu, Youqing;Wu, Shiyong;Li, Ye;Gao, Jinsheng[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Dept Chem Engn Energy Resources, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Minist Educ, Key Lab Coal Gasificat, Shanghai 200237, Peoples R China

年份：2009

卷号：23

期号：10

起止页码：5144

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20094512424338);WOS:【SCI-EXPANDED(收录号:WOS:000270671800060)】；

基金：The work is supported by Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT). The authors also thank Special Fund (YB0157108) for Excellent Young Teachers of Shanghai City, National Basic Research Program of China (2004CB217704), State Natural Science Foundation of China (20876050), and Natural Science Foundation of Shanghai City (09ZR1407400) for financial support.

语种：英文

外文关键词：Alumina - Aluminum oxide - Atomic emission spectroscopy - Cotton - Potassium compounds - Feldspar - Alkalinity - Chlorine compounds - Crops - Sodium compounds

摘要：In this paper, the physicochemical characteristics and mineral transformation behavior of three crop straw ashes (rice straw, wheat straw, and cotton straw) were investigated using ICP-AES, XRF, SEM-EDS, XRD, and ash fusion point analyzer. It was found that these ashes had quite high content of alkali metals (especially K) and quite low fusion point (especially cotton straw ashes) and caused easily the corrosion, slagging, and fouling of equipments. These straw ash particles were uniformly distributed in the small, medium, and large size. As the ashing temperature increased, some amounts of K (in the form of KCl) were released into the gas phase, quartz transformed to cristobalite and then keatite, and sonic mineral components also occurred to transform. Up to 1088 K, K2O and Na2O separately reacted with Al2O3 and SiO2 to produce albite (K-Al-Si) and sanidine (Na-Al-Si). Above 1273 K, other alkaline earth oxides also participated in the above reactions to form amorphous matters like augite. Meanwhile, comprehensive utilization of crop straw ashes is also worth our attention, due to their special compositions.