有色金属科学与工程2017，Vol.8Issue(6)：98-104,7.DOI:10.13264/j.cnki.ysjskx.2017.06.016
六水草酸镝热分解过程机理及动力学研究
Mechanism and kinetics of thermal decomposition of dysprosium oxalate with six water
摘要
Abstract
Rare earth oxalates are the common precursors for preparing rare earth oxides, especially rare earth oxides with controlled particle size, which have the advantages of good precipitate crystal form, easy filtration and decomposition, etc. However, kinetic study of the thermal decompositionforcurrent rare earth oxalates was less,Therefore,thethermogravimetry -differential thermal analysis method was used to study the thermal decomposition process of dysprosium hexahydrate. The decomposition kinetics parameters of dysprosium hexahydrate were calculated by Kissinger, Ozawa and Crane methods. Coats- Redfern method was used to find the mechanism function of the reaction.The results showed that the decomposition activation energies calculated by several methods were quite close and the thermal decomposition of dysprosium hexahydrate was carried out in two steps. The first step was the first order dehydration reaction. The reaction mechanism function was F1 ,The activation energy was 62.48 kJ/mol and the pre-exponential factor was 1.84 ×106. The second step was also the first-order decomposition reaction. The reaction mechanism function was F2. The apparent activation energy was 106.42 kJ/mol and the pre-exponential factor was 2.79×107.关键词
六水草酸镝/热分解/热重-差热分析/动力学参数Key words
dysprosium oxalate with six water/thermal decomposition/thermogravimetric differential thermal analysis/kineticparameters分类
矿业与冶金引用本文复制引用
王赟,邓庚凤,蔡晨龙,葛南飞,邓亮亮,俞峰..六水草酸镝热分解过程机理及动力学研究[J].有色金属科学与工程,2017,8(6):98-104,7.基金项目
国家自然科学基金资助项目(51564022) （51564022）
