摘要
利用山东微山氟碳铈精矿添加２０％Ｎａ２ＣＯ３的ＴＧＤＴＡ曲线，采用ＦｒｅｅｍａｎＣａｒｏｌ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＝１８８．６ｋＪ／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＝１８１．４ｋＪ／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。
The roast reaction kinetics of bastnasite concentrate mixed with 20% Na2CO3 was studied by means of FreemanCarroll and SubtractiveDifferentiation methods with its TGDTA spectra. The apparent activation energy and reaction order were 188.6 kJ·mol-1 and 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.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
1998年第2期299-302,共4页
The Chinese Journal of Nonferrous Metals
