Kinetics Analysis on Mixing Calcination Process of Fly Ash and Ammonium Sulfate  

硫酸铵与粉煤灰混合焙烧过程的动力学分析(英文)

作　　者：王鹏 李来时 魏德洲 

机构地区：[1]College of Resources and Civil Engineering,Northeastern University [2]Shenyang Aluminum and Magnesium Engineering and Research Institute

出　　处：《Chinese Journal of Chemical Engineering》2014年第9期1027-1032,共6页中国化学工程学报（英文版）

基　　金：Supported by the National Science and Technology Project of China(2012BAB01B00)

摘　　要：The further development of the extraction of alumina that is produced in the calcination process of ammonium sulfate mixed with fly ash was limited because of the lack of systematic theoretical study. In order to aggrandize the research of the calcination process, the kinetics and reaction mechanism of the calcinations were studied. The result suggests that there are two stages in the calcination process, and the alumina extraction rate increases swiftly in the initial stage, but slows down increasing in the later stage. The apparent activation energy of the initial and later stages equals to 13.31 and 35.65 kJ·mol-1, respectively. In the initial stage, ammonium sulfate reacts directly with mullite in the fly ash to form ammonium aluminum sulfate, while in the later stage, aluminum sulfate is formed by the reaction between ammonium aluminum sulfate and ammonium sulfate.The further development of the extraction of alumina that is produced in the calcination process of ammonium sulfate mixed with fly ash was limited because of the lack of systematic theoretical study. In order to aggrandize the research of the calcination process, the kinetics and reaction mechanism of the calcinations were studied. The result suggests that there are two stages in the calcination process, and the alumina extraction rate increases swiftly in the initial stage, but slows down increasing in the later stage. The apparent activation energy of the initial and later stages equals to 13.31 and 35.65 kJ. mol-1, respectively. In the initial stage, ammonium sulfate reacts directly with mullite in the fly ash to form ammonium aluminum sulfate, while in the later stage, aluminum sulfate is formed by the reaction between ammonium aluminum sulfate and ammonium sulfate.

关 键 词：Mixing calcinationsKineticsActivation energyReaction mechanism 

分 类 号：O643.1[理学—物理化学]