Study on thermal activation and its non-isothermal kinetics of chalcopyrite

被引：0

作者：

Wu Y. ^{[1
]}

Liao Y. ^{[1
]}

Ma H. ^{[1
]}

Ji G. ^{[1
]}

Liu Q. ^{[1
]}

Xi J. ^{[1
]}

机构：

[1] Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 02期

基金：

中国国家自然科学基金;

关键词：

chalcopyrite; chase change; non-isothermal kinetics; pyrolysis;

D O I：

10.11817/j.issn.1672-7207.2023.02.005

中图分类号：

学科分类号：

摘要：

In order to study the dynamic behavior of non-isothermal pyrolysis of complex polymetallic chalcopyrite, thermogravimetric differential scanning calorimetry(TG-DSC) analysis was carried out in argon atmosphere. The activation energy(Eα), pre-exponential factor(A) and mechanism function of the pyrolysis of complex polymetallic chalcopyrite were calculated by the methods of FWO, Kissinger and Coats-Redfern, and the mineral phase structure and morphology of pyrolyzed products were characterized by XRD and SEM-EDS. The results show that chalcopyrite in the raw material is transformed into corresponding copper and iron sulfides after pyrolysis, and the morphology of pyrolyzed products changes to loose multi-granular shape with cracks from the dense massive structure of the raw material, and that the pyrolysis of chalcopyrite can be divided into two stages. The first stages carried out at the temperature of 40 − 300 ℃, which is consistent with the R3 model(volume shrinkage model) with the apparent activation energy(Eα) of 11.422 kJ/mol and the logarithm of pre-exponential factor(lgA) of −1.882. The second stage occurs at the temperature in the range of 300−650 ℃, which conforms to AE4 model(Avrami-Erofeev equation) with the apparent activation energy(Eα) of 134.233 kJ/mol, and the logarithm of pre-exponential factor (lgA) of 9.777. © 2023 Central South University of Technology. All rights reserved.

引用

页码：443 / 455

页数：12

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