稀土尾矿催化脱硝可行性实验研究  

Experimental Study on Feasibility of Catalytic Denitrification by Rare Earth Tailings

作　　者：王建 龚志军[1,2] 徐国栋 武文斐 WANG Jian;GONG Zhi-jun;XU Guo-dong;WU Wen-fei(School of Environment&Energy,Inner Mongolia University of Science&Technology,Baotou 014010,China;Key Laboratory of High Efficiency and Clean Combustion in Inner Mongolia Autonomous Region,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：《稀有金属与硬质合金》2020年第2期22-27,共6页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金(51866013);内蒙古自治区自然科学基金(2017MS(LH)0529)。

摘　　要：采用X射线荧光光谱分析仪(XRF)、X射线衍射仪(XRD)、扫描电镜(SEM)对稀土尾矿进行表征分析发现,稀土尾矿所含元素较多,矿物与矿物间嵌布关系复杂。针对稀土尾矿的特性,利用立管炉对稀土尾矿催化脱硝性能进行测试。结果表明:NO转化率随着反应温度和气体停留时间的增加而增加,且固定床反应器NO转化率要高于鼓泡床反应器NO转化率。当反应温度为800℃时,NO转化率达98.7%。利用拟薄水铝石和稀土尾矿为原料进行研磨焙烧制备脱硝催化剂。稀土尾矿总量不变,随着拟薄水铝石质量的增加,NO转化率也相应增加。当反应温度为600℃时,拟薄水铝石与稀土尾矿质量比为1∶2的催化剂比纯稀土尾矿的NO转化率提高15%。热力学计算结果表明,含铁量较多的稀土尾矿用于CO还原脱硝是可行的。X-ray fluorescence spectrometer(XRF),X-ray diffractometer(XRD) and scanning electron microscopy(SEM) were used to characterize the rare earth tailings.It is found that there are many elements in the tailings,and the relationship among minerals is complex.According to the characteristics of rare earth tailings,the catalytic denitrification performance of rare earth tailings was tested in a vertical tube furnace.The results show that NO conversion rate increases with the increase of reaction temperature and gas residence time,and NO conversion rate in fixed bed reactor is higher than that in bubbling bed reactor.When the reaction temperature is 800 ℃,NO conversion rate reaches 98.7%.The denitration catalyst was prepared by grinding and roasting with pseudo-boehmite and rare earth tailings as raw materials.When the total amount of rare earth tailings remains unchanged,the NO conversion rate increases with the increase of pseudo-boehmite mass.When the reaction temperature is 600 ℃,the NO conversion rate of the catalyst with the mass ratio of pseudo-boehmite to rare earth tailings of 1∶2 is 15% higher than that of the pure rare earth tailings.The thermodynamic calculation proves that the rare earth tailings with high iron content is feasible for CO reduction denitrification.

关 键 词：催化脱硝 稀土尾矿 CO 拟薄水铝石 NO转化率 热力学计算 

分 类 号：TQ426.83[化学工程]