Kinetics of rare earth leaching from roasted ore of bastnaesite with sulfuric acid  

焙烧氟碳铈矿硫酸浸出稀土的动力学(英文)

作　　者：冯兴亮[1,2] 龙志奇[1,2] 崔大立[1,2] 王良士[1,2] 黄小卫[1,2] 张国成[1,2] 

机构地区：[1]北京有色金属研究总院稀土材料国家工程研究中心,北京100088 [2]有研稀土新材料股份有限公司,北京100088

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第3期849-854,共6页中国有色金属学报（英文版）

基　　金：Project(NDRC high-tech No.606,2009) supported by the Major Industries Technological Development Special Fund of Development and Reform Commission,China;Project(50934004) supported by the National Natural Science Foundation of China

摘　　要：Sulfuric acid leaching process was applied to extracting rare earth（RE） from roasted ore of Dechang bastnaesite in Sichuan,China.The effect of particle size,stirring speed,sulfuric acid concentration and leaching temperature on RE extraction efficiency was investigated,and the leaching kinetics of RE was analyzed.Under selected leaching conditions,including particle size（0.074-0.100 mm）,sulfuric acid concentration 1.50 mol/L,mass ratio of liquid to solid 8 and stirring speed 500 r/min,the leaching kinetics analysis shows that the reaction rate of leaching process is controlled by diffusion through the product/ash layer which can be described by the shrinking-core model,and the calculated activation energy of 9.977 kJ/mol is characteristic for a diffusion-controlled process.研究了硫酸浸出德昌稀土与天青石共伴生矿的焙烧矿过程。考查粒度、搅拌速度、硫酸浓度和温度对稀土浸出率的影响,并对稀土的浸出动力学进行分析。在选定的浸出条件下:粒径0.074～0.100mm、硫酸浓度1.5mol/L、液固比8:1、搅拌速度500r/min,稀土浸出反应受内扩散控制,表观活化能为9.977kJ/mol。

关 键 词：BASTNAESITE rare earth roasting ore LEACHING KINETICS 

分 类 号：TD955[矿业工程—选矿]