用热分析技术研究氟碳铈精矿碳酸钠焙烧反应动力学

来源期刊：中国有色金属学报1998年第2期

论文作者：柳召刚 马莹 魏绪钧 徐秀芝 冯法伦

文章页码：299 - 302

关键词：氟碳铈矿 热分析 焙烧 动力学

Key words：bastnasite , thermal analysis , roast , kinetics

摘    要：利用山东微山氟碳铈精矿添加20%Na₂CO₃的TG-DTA曲线，采用Freeman- Carroll法和差减微分法热分析技术， 研究其焙烧反应动力学， 取得了令人满意的结果。利用TG曲线计算得到的反应表观活化能E=188.6 kJ/mol， 反应级数n=0.89；利用DTA曲线计算得到的反应表观活化能E=181.4 kJ/mol ， 反应 级数n=0.73。两种方法计算的结果吻合较好。 同单纯氟碳铈精矿的焙烧反应动力学计算结果相比较，加入Na₂CO₃使氟碳铈精矿的焙烧分解反应变得复杂，但可以使反应 的活化能降低，有利于精矿的分解。

Abstract: The roast reaction kinetics of bastnasite concentrate mixed with 20% Na₂CO₃was studied by means of Freeman-Carroll and Subtractive-Differentiation methods with its TG-DTA spectra. The apparent activation energy and reaction order were 188.6 kJ·mol^-1and 0.89 respectively by the TG curve, 181.4 kJ·mol^-1 and 0.73 respectively by the DTA curve; these results were almost the same. Compared with the kinetics results of pure concentrate, the decomposition reaction of concentrate consisting of Na₂CO₃ became more complex, but the reaction activation energy decreased. This decrease was of benefit to decomposition reaction of concentrate.