活化分解氟碳铈精矿对钙化转型提取稀土的影响  

Activating Decomposition of Bastnaesite Concentrate to Extracting Rare Earth with Calcification Transition Process

作　　者：黄宇坤[1] 张廷安[1] 豆志河[1] 刘江[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110819

出　　处：《中国稀土学报》2014年第6期719-726,共8页Journal of the Chinese Society of Rare Earths

基　　金：国家重点基础研究发展计划(973计划)(2012CBA01205)资助

摘　　要：采用活化预处理-加压钙化处理氟碳铈精矿新工艺,研究了活化温度、活化时间对精矿分解、氟元素损失的影响,及不同温度活化分解精矿钙化转型后对稀土浸出率的影响,并计算了活化前后精矿钙化转型过程中动力学参数。结果表明:氟碳铈精矿经过活化分解更利于钙化转型过程的进行,稀土总浸出率由27.81%提高到70.76%;480℃温度下活化60 min,精矿基本分解完全,氟损失率为3.24%;通过计算得出氟碳铈精矿钙化转型过程为化学反应控制,而活化后精矿的钙化转型过程为扩散过程控制。The decomposed process of bastnaesite concentrate was studied. The relationship among decomposition, loss rate of fluorite, leaching rate of rare earth, activation temperature and time was investigated. The kinetic pa- rameters of the activated bastnaesite and the unaetivated bastnaesite in the calcification transition process were cal- culated. The activating affected the behavior of rare earth in the calcification transition process and leaching rate of total rare earth increased from 27.81% to 70.76%. And bastnaesite concentrate was decomposed completely at 480 ℃ for 60 min, while the loss rate of fluorine was 3.24%. It indicated that the calcification transition process for activated bastnaesite was controlled by diffusion process of reactant.

关 键 词：氟碳铈精矿 钙化转型 氟损失率 动力学参数 稀土 

分 类 号：TF8[冶金工程—有色金属冶金]