废烟气脱硝催化剂中TiO_(2)资源化回收实验研究  

Experimental study on the resource recovery of TiO_(2) from waste flue gas denitrification catalyst

作　　者：吴卫红[1,2] 宋浩[1,2] 孙红娟 王立[1] 宋思慧 柳江涛 高翔[1,2] WU Weihong;SONG Hao;SUN Hongjuan;WANG Li;SONG Sihui;LIU Jiangtao;GAO Xiang(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou Zhejiang 310027;Jiaxing Research Institute of Zhejiang University,Jiaxing Zhejiang 314031;Hebei Hantang Hongyuan Environmental Protection Technology Co.,Ltd.,Xingtai Hebei 055550)

机构地区：[1]浙江大学能源高效清洁利用全国重点实验室,浙江杭州310027 [2]浙江大学嘉兴研究院,浙江嘉兴314031 [3]河北汉唐宏远环保科技有限公司,河北邢台055550

出　　处：《环境污染与防治》2024年第6期842-849,共8页Environmental Pollution & Control

基　　金：邢台市重点研发计划项目(No.2022zz047)。

摘　　要：采用高温碱浸和酸洗的方法对废选择性催化还原(SCR)脱硝催化剂进行处理,研究碱浸和酸洗对催化剂各组分的浸出效果,考察温度对催化剂浸出行为的影响规律。结果表明,碱浸温度的提高促进V和W的浸出,210℃时V和W的浸出率分别为82.38%和74.92%。经高温碱浸和酸洗处理后,Al、Ca、Na等杂质的最高浸出率均可达98%以上,回收TiO_(2)的纯度较高,可用于生产新催化剂。高温碱浸会破坏催化剂的结构,有利于后续HCl处理对杂质的去除,除杂效果优于直接酸洗处理。高温碱浸过程中会生成Na_(2)TiO_(3),经HCl反应并水解后会形成新的TiO_(2)颗粒,形成更多的小孔,比表面积增大。Alkaline leaching and acid washing at high temperatures were used to treat waste SCR catalysts.The leaching effect of alkaline and acid leaching on the components of catalyst and the influence law of temperature on their leaching behavior were studied.The results indicated that increasing the alkaline leaching temperature was beneficial for the leaching of V and W.The leaching rates of V and W were 82.38% and 74.92% at 210 ℃,respectively.The maximum leaching rate of impurities such as Al,Ca and Na could reach over 98%.High purity of TiO_(2) could be recycled and used for producing fresh catalyst.The catalyst structure was destroyed by alkaline leaching treatment at high temperatures,which was beneficial for the removal of the impurities in subsequent hydrochloric acid treatment and was better than direct acid washing.Na_2TiO_(3) was generated in the alkaline leaching process at high temperatures,which reacted with hydrochloric acid and then hydrolyzed to form new TiO_(2) particles,forming more small pores and increasing specific surface area.

关 键 词：废选择性催化还原脱硝催化剂 TiO_(2) 高温碱浸 酸洗 资源化回收 

分 类 号：X705[环境科学与工程—环境工程]