控制萃取平衡时间选择性分离回收FCC废催化剂酸浸液中的钒  

SELECTIVE SEPERATION AND RECOVERY OF VANADIUM FROM ACID LEACH SOLUTION OF WASTE FCC CATALYST BY CONTROLLED EQUILIBRIUM TIME OF EXTRACTION

作　　者：张立萍 吕灵灵 孔慧 叶红 祝汉国 Zhang Liping;LüLingling;Kong Hui;Ye Hong;Zhu Hanguo(Qingdao Huicheng Environmental Technology Co.Ltd.,Qingdao,Shandong 266500)

机构地区：[1]青岛惠城环保科技股份有限公司,山东青岛266500

出　　处：《石油炼制与化工》2021年第8期96-101,共6页Petroleum Processing and Petrochemicals

摘　　要：以2-乙基己基膦酸单2-乙基己基酯(P507)为萃取剂,采用控制萃取平衡时间的方法从催化裂化(FCC)废催化剂的含铁酸浸出液中选择性萃取分离回收钒。试验结果表明:采用P507、磷酸三丁酯(TBP)、磺化煤油体积分数分别为10%,5%,85%的协萃体系,在萃取剂皂化率为50%、萃取相比为1∶1、萃取平衡时间为10 min的条件下,经五级逆流萃取,钒的萃取率达99.5%,而铁的萃取率仅为5.2%;在反萃取剂硫酸的质量浓度为150 g/L、反萃取相比为6∶1、反萃取平衡时间为15 min的条件下,经四级逆流反萃取,反萃取液中钒的质量浓度为18630 mg/L,钒的多级反萃取率达99.5%,反萃取液中铁的质量浓度仅为70 mg/L,实现了钒的有效富集回收。通过控制萃取平衡时间可实现FCC废催化剂硫酸浸出液中钒与铁的有效分离及钒的富集回收。Vanadium was selectively extracted from the Fe-containing acid leaching solution of waste fluid catalytic cracking(FCC)catalyst by controlled equilibrium time of extraction method using 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester(P507)as the extraction agent.The test results showed that using the co-extraction system composing of 10% of P507,5% of tributyl phosphate(TBP)and 85% of sulfonated kerosene,under the conditions of a saponification rate of extraction agent of 50%,an extraction ratio of 1∶1 and an extraction equilibrium time of 10 min,the extraction rate of vanadium reached 99.5% after five-stage countercurrent extraction,and the extraction rate of iron was only 5.2%.Under the conditions of a mass concentration of sulfuric acid of 150 g/L,a reverse extraction ratio of 6∶1,and an equilibrium time of 15 min,the mass concentration of vanadium in the reverse extraction solution was 18630 mg/L,the multistage reverse extraction rate of vanadium was 99.5%,and the mass concentration of iron in the reverse extraction solution was only 70 mg L.The effective enrichment and recovery of vanadium was realized.Vanadium and iron could be separated effectively and vanadium could be enriched and recovered from sulfuric acid leaching solution of waste FCC catalyst by controlling equilibrium time of extraction method.

关 键 词：催化裂化 废催化剂 2-乙基己基膦酸单2-乙基己基酯 萃取 钒 铁 

分 类 号：X705[环境科学与工程—环境工程] TF841.3[冶金工程—有色金属冶金]