碳酸铈反应结晶过程数值模拟  

Numerical Simulation of Cerium Carbonate Reactive Crystallization Process

作　　者：李梅[1,2] 贾慧灵[1,3] 李文武[2] 赵静[3] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029 [2]内蒙古科技大学材料与冶金学院,内蒙古包头014010 [3]内蒙古科技大学机械工程学院,内蒙古包头014010

出　　处：《稀土》2015年第6期84-90,共7页Chinese Rare Earths

基　　金：国家杰出青年基金项目(51025416);内蒙古自治区高等学校科学技术研究项目(NJZY14169)

摘　　要：为深入了解反应结晶过程中碳酸铈颗粒的分散特性,采用CFD软件模拟DTB结晶器内固-液两相和液-液两相混合过程。考察固-液两相混合过程中,碳酸铈颗粒的剪切速率分布和浓度分布,对反应结晶器进行优化,最终选取了两个进料口位置在桨叶上方附近、桨叶距离底面高度为H/3、离底悬浮搅拌转速为425 r/min的最佳操作条件。进而分析液-液两相混合反应生成碳酸铈的过程,模拟结果表明,适当增加搅拌速度可以增大反应区域、增加颗粒粒度的均匀性;反应物料CeCl_3质量分数为0.3,NH_3HCO_3质量分数为0.4时,生成的碳酸铈颗粒粒度分布较均匀。In order to understand the dispersion characteristics of cerium carbonate particles during reactive crystalliza- tion, the mixing process of solid- liquid and liquid -liquid phases were simulated in the DTB crystallizer with the CFD soft- ware. In the solid - liquid mixing process, shear rate distribution and concentration distribution of cerium carbonate particles were investigated to optimize the crystallizer. Finally, two feed positions are selected close to the blade, the height of blade is H/3 from bottom,and suspension stirring speed is 425rpm. Based on the above best operation conditions,the reactive process of cerium carbonate was analyzed. The simulation results show that the reaction region and the particle size uniformity can be increased by increasing the stirring speed appropriately. When the mass fraction of reactant CeC13 is 0.3 and NH4HCO3 is 0.4, the size distribution of cerium carbonate particle is the most uniform.

关 键 词：碳酸铈 反应结晶 颗粒粒度 CFD模拟 

分 类 号：TQ031.2[化学工程]