干湿法结合工艺回收废弃SCR脱硝催化剂中的钛、钒和钨  

RECOVERY OF TITANIUM,VANADIUM AND TUNGSTEN FROM WASTE SCR DENITRATION CATALYST BY DRY-WET PROCESS

作　　者：滕玉婷 张亚平 王玲 吴鹏 TENG Yu-ting;ZHANG Ya-ping;WANG Ling;WU Peng(Key Laboratory for Energy Thermal Conversion and Control of Ministry of Education,School of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源与环境学院,能源热转换及其过程测控教育部重点实验室,南京210096

出　　处：《环境工程》2020年第11期163-167,174,共6页Environmental Engineering

基　　金：江苏省重点研发计划(社会发展)面上项目(BE2017716)。

摘　　要：利用干湿法结合工艺实现废弃SCR脱硝催化剂中Ti、V和W元素的高效分离和浸出,提出成套废弃SCR脱硝催化剂中Ti、V和W的回收技术。以废弃SCR脱硝催化剂为研究对象,优选Ti、V和W元素最佳浸出工况,研究硫酸溶解法回收TiO2和有机萃取法回收V2O5和WO3的回收率与纯度。结果表明:酸浸还原浸钒最优工艺条件为温度140℃,液固比30∶1;钠化焙烧浸钨最优工艺条件为煅烧温度750℃,反应物与Na2CO3配比(质量比)为1∶1.5,在以上条件下V、W浸出率分别达到97.6%、93.6%。利用硫酸溶解法回收得到的TiO2产物主要以锐钛矿晶型存在形式,在最佳焙烧温度750℃下,TiO2回收率达到97.17%,纯度为95.35%。利用有机萃取法回收得到的V2O5和WO3产物的回收率和纯度分别为72.47%、75.43%和93.25%、78.26%。In this paper,the efficient separation and leaching of Ti,V and W elements in the waste SCR denitration catalyst were carried out by the dry-wet method,and the recovery technology of Ti,V and W in the waste SCR denitration catalyst was proposed.Taking waste SCR denitration catalyst as the research object,the leaching conditions of Ti,V and W elements were optimized,and the recovery rate and purity of TiO2 recovered by sulfuric acid dissolution method and V2O5 and WO3 recovered by organic extraction method were also researched.The results showed that the optimal process conditions for acid leaching and reduction of vanadium were temperature of 140℃,liquid-solid ratio of 30∶1;and the optimal process conditions for sodium roasting and leaching of tungsten were roasting temperature of 750℃,reactants and Na2CO3 ratio of 1∶1.5.Under the above reaction conditions,the leaching rates of V and W were 97.6% and 93.6%,respectively.The TiO2 product recovered by the sulfuric acid dissolution method mainly existed in the form of anatase crystal.At the optimum roasting temperature of 750℃,the recovery rate of TiO2 was 97.17% and the purity rate was 95.35%.The recovery and purity rate of the V2O5 and WO3 products recovered by the organic extraction method were 72.47%,75.43%,and 93.25%,78.26%,respectively.

关 键 词：废弃SCR脱硝催化剂 浸取 回收 钛 钒 钨 

分 类 号：X701[环境科学与工程—环境工程]