文献类型：期刊文章

作　　者：杨权成[1,2] 马淑花[1] 郑诗礼[1] 张然[1]

机构地区：[1]中国科学院过程工程研究所绿色过程与工程重点实验室,北京100190 [2]华北科技学院环境工程学院,北京101601

出　　处：《Transactions of Nonferrous Metals Society of China》

基　　金：Project (2012BAF03B01) supported by the National Science and Technology Support Program of China;Project (2011AA060701) supported by the Hi-tech Research and Development Program of China

年　　份：2014

卷　　号：24

期　　号：4

起止页码：1187-1195

语　　种：中文

收录情况：AJ、CAS、CSA、CSA-PROQEUST、CSCD、CSCD2013_2014、EBSCO、EI、IC、INSPEC、JST、SCI(收录号：WOS:000339276700037)、SCI-EXPANDED(收录号：WOS:000339276700037)、SCIE、SCOPUS、WOS、ZGKJHX、普通刊

摘　　要：To utilize CFBC Al-rich fly ash, a mild hydrochemical extraction process was investigated for recovery of alumina. An alumina extraction efficiency of 92.31%was attained using a 45%NaOH solution, an original caustic ratio （molar ratio of Na2O to Al2O3 in the sodium aluminate solution） of 25, a molar ratio of CaO to SiO2 in the fly ash of 1.1, a liquid volume to solid mass ratio of 9, a reaction temperature of 280 ℃, and a residence time of 1 h when treating fly ash with an alumina to silica mass ratio （A/S） of 0.78 and an alumina content of 32.43%. Additionally, the alumina leaching mechanism was explored via structural and chemical analysis, which revealed that after alkaline digestion, the main solid phase containing silica was NaCaHSiO4 with a theoretical A/S of zero.

关 键 词：recovery of alumina  fly ash  phase transformation  circulating fluidized bed combustion （CFBC）  

分 类 号：TQ536.4] TQ133.1