文献类型：期刊文献

英文题名：Dissolution Kinetics of Aluminum, Calcium, and Iron from Circulating Fluidized Bed Combustion Fly Ash with Hydrochloric Acid

作者：Luo, Qing[1];Chen, Guilan[1];Sun, Yuzhu[1];Ye, Yinmei[1];Qiao, Xiuchen[1];Yu, Jianguo[1]

机构：[1]E China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake R, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China

年份：2013

卷号：52

期号：51

起止页码：18184

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20140217172972);WOS:【SCI-EXPANDED(收录号:WOS:000329137500008)】；

基金：This research is supported by the Fundamental Research Funds for the Central Universities of China (WB1213008) and the National High Technology Research and Development (863 Program 2011AA06A102).

语种：英文

外文关键词：Activation energy - Calcination - Fluidized bed process - Leaching - Iron - Aluminum - Calcium - Feldspar - Fluidized bed combustion - Dissolution - Fluidized beds

摘要：The dissolution of aluminum, calcium, and iron from calcined fly ash with hydrochloric acid was investigated using a batch reactor at temperatures from 315 to 345 K and over the acid concentration range of 1.4-6.0 M. Calcium was preferentially released compared to aluminum though these two elements in the calcined fly ash were mainly incorporated into the same mineralogical phase of anorthite. The dissolved fractions of aluminum, calcium, and iron increased with leaching time, but it decreased for silicon, which indicated the continuous precipitation of silicon during the leaching process. The dissolution kinetic data were successfully examined according to a semiempirical Avrami-type equation. The activation energies for dissolution of aluminum, calcium, and iron from the calcined fly ash with hydrochloric acid are 32, 28, and 19 kJ/mol, respectively.