摘要
用四川冕宁天然氟碳铈矿晶体为原料 ,研究其热分解过程。测定了粉状氟碳铈矿空气气氛下热分解过程的热重 差热曲线。根据Criado提出的反应动力学机制模型 ,采用热分析技术对动力学数据进行了处理和计算 ,绘制了氟碳铈矿粉末热分解反应的动力学曲线 ,与标准曲线比较 ,结合前期工作动力学参数计算的结果 ,确定了热分解过程的反应机制为形核和生长 ,其反应动力学模型的微分和积分形式的表达式分别为 :f(α) =( 1 -α)和g(α) =-ln( 1 -α)。
The thermal decomposition procedure of the powder of the single bastnaesite crystal ore collected in Mianning, Sichuan Province, was investigated, and the thermal decomposition procedure TG DTA curves of the bastnaesite were tested in the air. According to the kinetics mechanism model provided by Criado, the kinetics data were calculated and treated with thermal analysis technique, and the kinetics curves of the thermal decomposition reaction of the bastnaesite powder were drawn. Comparing this curve with the standard curves and combining with the previous research results of kinetics parameters calculation, the results show that its reaction mechanism is nucleation and nuclei growth, and its differential and integral forms of reaction kinetics model can be expressed as: f(α)=(1-α) and g(α) =-ln(1- α )
出处
《中国稀土学报》
CAS
CSCD
北大核心
2000年第1期24-26,共3页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金! ( 5980 4 0 0 3)资助项目
关键词
氟碳铈矿
热分解
动力学
粉状
模型
稀土金属
rare earths
bastnaesite
thermal decomposition
kinetics
reaction mechanism
