草酸分级浸取废SCR催化剂中的钒和钨  

Fractional Leaching of Vanadium and Tungsten from Spent SCR Catalyst with Oxalic Acid

作　　者：米巧民 姚俊轩 王兵[1,2] 常丽萍[1,2] 鲍卫仁[1,2] 张志华[3] 王建成 MI Qiaomin;YAO Junxuan;WANG Bing;CHANG Liping;BAO Weiren;ZHANG Zhihua;WANG Jiancheng(State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of Coal Science and Technology Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Puli Environmental Engineering Company Limited,Jinzhong 030600,China)

机构地区：[1]太原理工大学省部共建煤基能源清洁高效利用国家重点实验室,山西太原030024 [2]太原理工大学煤科学与技术教育部重点实验室,山西太原030024 [3]山西普丽环境工程股份有限公司,山西晋中030600

出　　处：《化学反应工程与工艺》2023年第6期525-534,共10页Chemical Reaction Engineering and Technology

基　　金：山西省重点研发计划项目(202202090301012);山西省科技创新人才重点团队(202204051002025)。

摘　　要：选择性催化还原反应(SCR)的废催化剂中含有钒、钨和钛等有价值的金属,为最大限度回收其中的钒和钨资源,采用草酸分级浸取废SCR催化剂中的钒和钨,系统考察了草酸浓度、浸取温度、液固比和浸取时间对钒和钨浸出率的影响,并通过X射线衍射(XRD)和X射线光电子能谱(XPS)等表征手段分析浸出机理。废SCR催化剂直接用草酸浸取,钒浸出率为76.95%,钨和钛浸出率仅为5.31%和0.22%,钒被浸出。滤渣经焙烧后用草酸浸取,钨浸出率为56.70%,钒和钛浸出率仅为16.36%和0.12%,钨被浸出,最后滤渣主要成分为锐钛矿型TiO_(2)。该流程实现了废SCR催化剂的分级浸取,钒和钨在不同步骤中浸出,避免了钒和钨分离困难的问题,简化了后续处理工作,降低了二次污染。Spent catalysts of selective catalytic reduction(SCR)contain valuable metals such as vanadium,tungsten and titanium.To maximize the recovery of vanadium and tungsten resources,the effects of oxalic acid concentration,leaching temperature,liquid-solid ratio and leaching time on vanadium and tungsten leaching efficiency were systematically investigated.The leaching mechanism was analyzed by X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).The spent SCR catalyst was leached directly with oxalic acid,the vanadium leaching efficiency was 76.95%,the tungsten and titanium leaching efficiency were only 5.31%and 0.22%,thus vanadium was leached.After roasting,the filter residue was leached with oxalic acid,and the tungsten leaching efficiency was 56.70%,vanadium and titanium leaching efficiency were only 16.36%and 0.12%,thus tungsten was leached,and the main component of the filter residue was anatase-type TiO_(2).The process achieved the fractional leaching of spent SCR catalyst,by vanadium and tungsten were leached in different steps,which avoided the difficulty of the subsequent separation of vanadium and tungsten,simplified the subsequent treatment work and reduced the secondary pollution.

关 键 词：废SCR催化剂 钒 钨 钛 草酸 分级浸取 

分 类 号：X784[环境科学与工程—环境工程]