氟碳铈精矿碳酸钠焙烧反应机制  

Study on Roast Reaction of Bastnasite Mixed with Sodium Carbonate

作　　者：柳召刚[1] 魏绪钧[2] 张继荣[2] 程耀庚 刘兴旺[3] 

机构地区：[1]包钢稀土研究院 [2]东北大学有色金属冶金系 [3]包头师范专科学校化学系

出　　处：《中国稀土学报》1998年第4期382-384,共3页Journal of the Chinese Society of Rare Earths

摘　　要：采用ＸＲＤ、ＤＴＡＴＧ及化学分析法，研究了氟碳铈精矿碳酸钠焙烧反应。结果表明，焙烧过程中，发生Ｆ－＋Ｃｅ３＋（Ｐｒ３＋）→Ｏ２－＋Ｃｅ４＋（Ｐｒ４＋）的类质同象替代，生成ＲＥＯ１＋ｘＦ１－ｘ（０＜ｘ＜１）类质同象混晶体，在不同条件下，可生成不同组成的类质同象混晶体。从实验数据得到ＲＥＯ１＋ｘＦ１－ｘ类质同象混晶体的晶胞参数ａ０与其氟含量的关系式为：ａ０＝０５４４９＋０００１０２×ｃＦ－。The research on the mechanism of roast reaction of bastnasite added with Na 2CO 3 was carried out by using DTA TG, X ray diffraction analysis and chemical analysis. The bastnasite was decomposed into REOF and CO 2 while roasting mixed with Na 2CO 3, then isomorphous subsitition, F -+Ce 3+ (Pr 3+ )→O 2- +Ce 4+ (Pr 4+ ), occurred in the REOF under involving Na 2CO 3, and the parameter a 0 of isomorphous mixed crystal REO 1+x F 1-x (0< x <1) was produced. The different compositions of REO 1+x F 1-x were produced under the different conditions. The lattice parameter a 0 of REO 1+x F 1-x is a liner function of the content of fluorine: a 0=0 5499+0 00102× c F - .

关 键 词：稀土 氟碳铈精矿 焙烧 碳酸钠 

分 类 号：TF845[冶金工程—有色金属冶金]