稀土精矿矿物学分析及球磨方式对NH_(3)-SCR性能影响  

Mineralogical analysis of rare earth concentrates and effects of ball milling on NH_(3)-SCR performance

作　　者：李娜[1] 任晨昊 孟昭磊 王晶晶 张凯[1] 武文斐[1,2] LI Na;REN Chenhao;MENG Zhaolei;WANG Jingjing;ZHANG Kai;WU Wenfei(Inner Mongolia University of Science and Technology,College of Environment and Energy,Baotou 014010,China;Inner Mongolia Autonomous Region Key Laboratory of Efficient and Clean Combustion,Baotou 014010,China)

机构地区：[1]内蒙古科技大学能源与环境学院,内蒙古包头014010 [2]内蒙古自治区高效洁净燃烧重点实验室,内蒙古包头014010

出　　处：《高校化学工程学报》2023年第4期669-678,共10页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(51866013);内蒙古自治区自然科学基金(2022LHMS02005);内蒙古自治区直属高校基本科研业务费(2023QNJS138)。

摘　　要：为了使稀土矿物在越来越多的领域被高效利用,采用矿物自动定量分析系统(AMICS)、扫描电子显微镜(SEM)、X射线能谱仪(EDS)、X射线衍射分析(XRD)、多功能化学吸附仪(H_(2)-TPR)、综合热重分析仪(DTG)、漫反射傅里叶变换红外光谱(DRIFTS)等技术对稀土精矿的表面形貌及矿相特征进行系统的分析,探究不同球磨方式对矿物表面形貌及氨气选择性催化还原氮氧化物(NH3-SCR)性能的影响。结果表明,精矿中的稀土元素主要集中在氟碳铈镧矿和独居石中,矿物之间存在致密的连生或包裹关系。经过研磨、普通球磨和低温高能球磨处理后,稀土精矿暴露出更多的包裹型矿物,提高与烟气的接触程度,增大比表面积及孔隙率,使矿物表面元素组分分布更加均匀,原位红外结果显示经低温高能球磨后的稀土精矿矿物的催化过程遵循Eley-Rideal和Langmuir-Hinshelwood双机理。此结果对白云鄂博稀土精矿进行高值化利用具有重要的理论参考依据。In order to make efficient usage of rare earth minerals in different fields,surface morphology and mineral phase characteristics of rare earth concentrates were systematically analyzed by automatic quantitative analysis system(AMICS),scanning electron microscopy(SEM),X-ray energy spectrometer(EDS),X-ray diffraction analysis(XRD),multifunctional chemical adsorption instrument(H_(2)-TPR),comprehensive thermal gravimetric analyzer(DTG),diffuse reflaxions infrared fourier transformations spectroscopy(DRIFTS)and other techniques.Effects of different ball milling methods on mineral surface morphology and NH_(3)-selective catalytic reduction(NH_(3)-SCR)were also studied.The results show that rare earth elements in the concentrate are mainly in forms of bastnasite and monazite,and there is a dense continuous or enveloping relationship between the minerals.After grinding,ordinary ball milling and low temperature high-energy ball milling treatments,more wrapped minerals were exposed,which improved their contact with flue gas,specific surface area and porosity,and made more uniform distribution of elemental components on mineral surface.In situ infrared results show that the catalytic process of rare earth concentrate minerals after low temperature high energy ball milling follows the dual mechanisms of Eley-Rideal and Langmuir-Hinshelwood.This result shows important guidance for high-value utilization of Bayan Obo rare earth concentrates.

关 键 词：稀土精矿 矿物分析 球磨 氨气选择性还原氮氧化物 

分 类 号：X511[环境科学与工程—环境工程]