文献类型：期刊文献

英文题名：Aluminum release from microwave-assisted reaction of coal fly ash with calcium carbonate

作者：Zhang, Zi-Yuan[1];Qiao, Xiu-Chen[1];Yu, Jian-Guo[2]

机构：[1]E China Univ Sci & Technol, Sch Resource & Environm Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：134

起止页码：303

外文期刊名：FUEL PROCESSING TECHNOLOGY

收录：;EI(收录号：20150900586000);WOS:【SCI-EXPANDED(收录号:WOS:000353739200037)】；

基金：The work described in this paper was funded by the Shanghai Pujiang Program (PJ200700339), the Science and Technology Commission of Shanghai Municipality (10dz12004901), the Shanghai Leading Academic Discipline Project (B506) and the Innovation Program of Shanghai Municipal Education Commission (11CXY25), the National Natural Science Foundation of China (21176082), the Specialized Research Fund for the Doctoral Program of Higher Education (20110074110002) and the Fundamental Research Funds for the Central Universities (ECUST).

语种：英文

外文关键词：Coal fly ash; Aluminum; Microwave; Anorthite; Calcium carbonate

摘要：Coal fly ash (CFA) is a potential aluminum resource alternative to bauxite. Because most aluminum in CFA exists in an inert mullite phase, the way in which CFA can be activated is becoming important. Thermal activation with the addition of calcium carbonate (CaCO3) is a common method for recovering aluminum from CFA; however, the lower energy efficiency of conventional heating has limited its application. In this investigation, microwave irradiation (MWI) was found to be an energy-saving method for CFA activation, and 95 wt% of aluminum was released from the specimen treated by MWI at 800 degrees C for 60 s. Compared to conventional thermal activation, MWI reduced the sintering temperature by nearly 400 degrees C and shortened the reaction time by 20 times. Anisothermal reactions, which occurred due to the selective heating of the microwave, controlled the decomposition rate of CaCO3 and the formation rate of anorthite. MWI also accelerated the formation of fused phase and contributed to the formation of well-ordered hexagonal anorthite. (C) 2015 Elsevier B.V. All rights reserved.