废SCR脱硝催化剂钒、钛、钨选择性分离研究  

Study on selective separation of vanadium, titanium and tungsten from spent SCR denitration catalyst

作　　者：张振全 赵备备 李兰杰 董自慧 白瑞国 王海旭 Zhang Zhenquan;Zhao Beibei;Li Lanjie;Dong Zihui;Bai Ruiguo;Wang Haixu(Institute of Vanadium and Titanium Technology,HBIS Group Chengsteel Company,Chengde 067102,Hebei,China;Hebei Province Key Laboratory of Vanadium and Titanium New Materials,Chengde 067102,Hebei,China;Hebei Vanadium and Titanium Industrial Technology Research Institute,Chengde 067102,Hebei,China)

机构地区：[1]河钢集团承钢公司钒钛技术研究所,河北承德067102 [2]河北省钒钛新材料重点实验室,河北承德067102 [3]河北省钒钛产业技术研究院,河北承德067102

出　　处：《钢铁钒钛》2021年第1期24-31,共8页Iron Steel Vanadium Titanium

基　　金：承德市科学技术研究与发展计划项目(项目编号:202001B007)。

摘　　要：分别采用NaOH、HCl浸出废SCR催化剂,碳酸钠焙烧-水浸废SCR催化剂选择性分离钛。试验表明:碳酸钠焙烧-水浸废催化剂可实现钛与钒、钨高效分离。较优工艺条件:焙烧温度850℃,焙烧时间3 h,碳酸钠与废催化剂质量比为1.3,浸出温度95℃,浸出时间1 h,搅拌速度500 r/min。V、As、W的浸出率分别为52.26%,98.24%和99.9%。采用硫酸浸出废SCR催化剂钠化焙烧渣实现高效提取钛。工艺条件:上述较优条件焙烧渣,40%硫酸,液固比4∶1,浸出温度90℃,浸出时间3 h,搅拌速度500 r/min。钛的浸出率为93.4%。采用自生晶种水解法制备偏钛酸,钛水解率为94.05%,偏钛酸纯度为94.07%。Titanium was selectively separated from waste SCR catalyst by NaOH leaching, HCl leaching and sodium carbonate roasting followed by water leaching, respectively. The results show that titanium can be separated from vanadium and tungsten by sodium carbonate roasting and water leaching of the catalyst. The optimum process conditions are as follows: roasting temperature 850 ℃, roasting time 3 h, mass ratio of sodium carbonate to waste catalyst 1.3, leaching temperature 95 ℃, leaching time 1 h, stirring speed 500 r/min. The leaching rates of V, As and W are 52.26%,98.24% and 99.9%,respectively. High efficient titanium extraction can be achieved by leaching sodium roasting slag of the spent SCR catalyst with sulfuric acid. The optimum conditions are as follows: 40% sulfuric acid, liquidsolid ratio 4∶1, leaching temperature 90 ℃, leaching time 3 h, stirring speed 500 r/min. The leaching rate of titanium is 93.4%. Metatitanic acid was prepared by hydrolysis. The hydrolysis rate of titanium is94.05% and the purity of metatitanic acid is 94.07%.

关 键 词：提钛 废SCR催化剂 选择性分离 NaOH浸出 HCl浸出 碳酸钠焙烧-水浸 

分 类 号：TF823[冶金工程—有色金属冶金] TQ426[化学工程]