Non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution

doi:10.1016/j.cjche.2015.07.029

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (10): 1634-1639.DOI: 10.1016/j.cjche.2015.07.029

• 催化、动力学与反应工程 • 上一篇下一篇

Non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution

Xiaofeng Zhu¹, Ting an Zhang¹, YanxiuWang¹, Guozhi Lu¹, Weiguang Zhang¹, CongWang¹, Aichun Zhao²

1 Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of Education, School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;
2 School of Material Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

收稿日期:2015-01-09 修回日期:2015-07-17 出版日期:2015-10-28 发布日期:2015-11-27
通讯作者: Ting an Zhang
基金资助:
Supported by the Joint Funds of the National Natural Science Foundation of China (U1202274), the National Natural Science Foundation of China (51204040), the Research Fund for the Doctoral Program of Higher Education of China (201200421100 11), and the Doctor Start-up Foundation in Taiyuan University of Science and Technology (20142001).

Non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution

Xiaofeng Zhu¹, Ting an Zhang¹, YanxiuWang¹, Guozhi Lu¹, Weiguang Zhang¹, CongWang¹, Aichun Zhao²

1 Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of Education, School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;
2 School of Material Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China

Received:2015-01-09 Revised:2015-07-17 Online:2015-10-28 Published:2015-11-27
Supported by:
Supported by the Joint Funds of the National Natural Science Foundation of China (U1202274), the National Natural Science Foundation of China (51204040), the Research Fund for the Doctoral Program of Higher Education of China (201200421100 11), and the Doctor Start-up Foundation in Taiyuan University of Science and Technology (20142001).

摘要/Abstract

摘要： 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, 5, 8, 10, 15 and 20 K·min^-1, respectively. The activation energy (E_a) 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.

关键词: Hydrogarnet, Differential scanning calorimetry (DSC), Activation energy, Mechanism function, Carbonation, Alumina

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, 5, 8, 10, 15 and 20 K·min^-1, respectively. The activation energy (E_a) 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.

Key words: Hydrogarnet, Differential scanning calorimetry (DSC), Activation energy, Mechanism function, Carbonation, Alumina

Xiaofeng Zhu, Ting an Zhang, YanxiuWang, Guozhi Lu, Weiguang Zhang, CongWang, Aichun Zhao. Non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution[J]. Chinese Journal of Chemical Engineering, 2015, 23(10): 1634-1639.

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Non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution

Non-isothermal decomposition kinetics of hydrogarnet in sodium carbonate solution

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