废烟气脱硝催化剂中TiO2资源化回收实验研究
Experimental study on the resource recovery of TiO2 from waste flue gas denitrification catalyst
吴卫红 1宋浩 1孙红娟 2王立 3宋思慧 3柳江涛 2高翔1
作者信息
- 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;浙江大学嘉兴研究院,浙江 嘉兴 314031
- 2. 河北汉唐宏远环保科技有限公司,河北 邢台 055550
- 3. 浙江大学能源高效清洁利用全国重点实验室,浙江 杭州 310027
- 折叠
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TiO2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Na2TiO3,经HCl反应并水解后会形成新的TiO2颗粒,形成更多的小孔,比表面积增大.
Abstract
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 TiO2 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.Na2TiO3 was generated in the alkaline leaching process at high temperatures,which reacted with hydrochloric acid and then hydrolyzed to form new TiO2 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/TiO2/高温碱浸/酸洗/资源化回收Key words
waste SCR catalyst/TiO2/alkaline leaching at high temperatures/acid washing/resource recovery引用本文复制引用
基金项目
邢台市重点研发计划项目(2022zz047)
出版年
2024
NETL
NSTL
万方数据