包头矿碳酸钠焙烧反应动力学研究  

Study on Roast Reaction Kinetics of Baotou Concentrate of Rare Earths

作　　者：乔军 柳召刚 马莹 张存瑞 郝先库 

机构地区：[1]包钢稀土研究院,包头014010

出　　处：《中国稀土学报》1999年第1期86-89,共4页Journal of the Chinese Society of Rare Earths

摘　　要：采用热重-差热、X射线衍射及化学分析等方法，对包头矿添加15％（质量分数）碳酸钠焙烧反应进行了研究。在623～741K，稀土氟碳酸盐（RECO3F）首先分解为REOF；在853～928K，稀土磷酸盐（REPO4）与碳酸钠反应分解为RE2O3，并生成Ca8Nd2(PO4）6O2。焙烧反应动力学计算结果为：在623～741K，反应活化能E＝152kJ·mol(－1)．反应级数n＝0．77，反应频率因子A＝1．11×10(12)s(－1)·mol(－1)，705K时反应速率常数k＝1．102；在853－928K，E=232kJ·mol(－1)，n＝1.16，A＝1．11×109s(-1)·mol(-1)，915K时反应速率常数k=1．07×10(-4)。由热重曲线推断，两阶段反应机制方程式均为：F1=-ln（1-α）。The mechanism of roast reaction of Baotou concentrate of rare earth added by 15%Na2CO3 was studied by using thermal analysis, X-ray diffraction and chemical analysis. Bastnasite(RECO3F) was first decomposed into REOF at 623~ 741 K, then monazite(REPO4) wasdecomposed nit6 RE2O3 and C'NdZ (PO4)6O2 was formed at 853 ~ 928 K. The kinetics ofroast reaction was cumulated. At 623 ~ 741 K, E = 152 kJ.mol-1, n = 0.77, A = 1. 11 x 1012s-1 .mol-1, k = 1. 102(T = 705 K), and at 853 ~ 928 K, E = 232 kJ.mol-1, n = 1. 16, A =1. 11× 109 s- 1' mol-1, k =1 .07× 10-4(T = 915 K). The mechanism of roast reaction may beexpressed as follows: F1= - In(1-α ) at 623 ~ 741 K and 853 ~ 928 K according to thermogravimetric curves.

关 键 词：包头矿 碳酸钠 焙烧动力学 稀土矿 

分 类 号：TF845.031[冶金工程—有色金属冶金]