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

doi:10.1016/j.cjche.2014.06.033

›› 2014, Vol. 22 ›› Issue (9): 1027-1032.DOI: 10.1016/j.cjche.2014.06.033

• 能源、资源与环境技术 • 上一篇下一篇

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

Peng Wang^1,2, Laishi Li², DezhouWei¹

1 College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;
2 Shenyang Aluminum and Magnesium Engineering and Research Institute, Shenyang 110001, China

收稿日期:2013-12-16 修回日期:2014-04-29 出版日期:2014-09-28 发布日期:2014-11-04
通讯作者: Peng Wang
基金资助:
Supported by the National Science and Technology Project of China (2012BAB01B00).

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

Peng Wang^1,2, Laishi Li², DezhouWei¹

1 College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;
2 Shenyang Aluminum and Magnesium Engineering and Research Institute, Shenyang 110001, China

Received:2013-12-16 Revised:2014-04-29 Online:2014-09-28 Published:2014-11-04
Supported by:
Supported by the National Science and Technology Project of China (2012BAB01B00).

摘要/Abstract

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 calcinationswere 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 calcinations, Kinetics, Activation energy, Reaction mechanism

Abstract: 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 calcinationswere 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.

Key words: Mixing calcinations, Kinetics, Activation energy, Reaction mechanism

Peng Wang, Laishi Li, DezhouWei. Kinetics Analysis on Mixing Calcination Process of Fly Ash and Ammonium Sulfate[J]. , 2014, 22(9): 1027-1032.

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

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

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