Non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution

Xiaofeng Zhu; Ting an Zhang; YanxiuWang; Guozhi Lu; Weiguang Zhang; CongWang; Aichun Zhao

doi:10.1016/j.cjche.2015.07.029

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Non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution

催化、动力学与反应工程 | Updated：2026-01-06

- Non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution
- Chinese Journal of Chemical Engineering Vol. 23, Issue 10, Pages: 1634-1639(2015)
- Affiliations：
  
  2 School of Material Science and Engineering, Taiyuan University of Science and Technology,Taiyuan,China,030024
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2015.07.029
  CLC：
- Published：2015
- Accepted：
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Xiaofeng Zhu, Ting an Zhang, YanxiuWang, Guozhi Lu, Weiguang Zhang, CongWang, Aichun Zhao. Non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution[J]. Chin.J.Chem.Eng., 2015, 23(10): 1634-1639.
DOI：

Xiaofeng Zhu, Ting an Zhang, YanxiuWang, Guozhi Lu, Weiguang Zhang, CongWang, Aichun Zhao. Non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution[J]. Chin.J.Chem.Eng., 2015, 23(10): 1634-1639. DOI： 10.1016/j.cjche.2015.07.029.

摘要

Abstract

Carbonation decomposition of hydrogarnet is a significant reaction of the calcification-carbonation new method for alumina production by using low-grade bauxite. In this work

non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution was studied by high-pressure differential scanning calorimetry (HPDSC) at different heating rates of 2

15 and 20 K·min

-1

respectively. The activation energy (E

) was calculated with the help of isoconversional method (model-free)

and the reaction mechanism was determined by the differential equation method. The calculated activation energy of this reaction was 115.66 kJ·mol

-1

. Furthermore

the mechanism for decomposition reaction is Avrami-Erofeev (n = 1.5)

and the decomposition process is diffusion-controlled.

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