氟碳铈精矿焙烧反应的研究

Study on the Roast Reaction of Bastnasite

本文利用ＸＲＤ、ＤＴＡ－ＴＧ及化学分析等方法，对氟碳铈矿的焙烧反应进行了研究。指出氟碳铈精矿在７５０℃下，焙烧５ｈ，分解反应分为两步进行，首先ＲＥＣＯ３Ｆ（本文中ＲＥ代表Ｃｅ、Ｌａ、Ｎｄ、Ｐｒ）分解为ＲＥＯＦ，然后ＲＥＯＦ继续氧化分解得到：Ｃｅ０．７５Ｎｄ０．２５Ｏ１．８７５、ＰｒＯ１．８３、ＬａＦ３等，在焙烧过程中发生部分脱氟，同时铈和镨被部分氧化为四价。同时对焙烧反应动力学进行了计算，得出：反应表观活化能Ｅ＝２２９．７ｋＪ／ｍｏｌ，反应级数ｎ＝０．９５。

The research on the mechanism of roast reaction of bastnasite was carried out using thermal,x-ray diffraction and chemical analyses. The bastnasite was first decomposed into REOF (RE stands for Ce,La,Nd andPr,the same below) and CO 2 as roasting at 750℃ for 5h,then REOF was decomposed into Ce 0 75 Nd 0 25 O 1 875 ,PrO 1 83, and LaF 3 which mixed with vapour in air,The kinetics of roast reaction of bastnasite was calculated, resalting in E=229.7kJ/mol,n=0.95.