废石化催化剂碱浸液中钒的分离提取研究

以废石化催化剂碱性浸出液为研究对象, 进行了N263三级逆流萃取+超声波一级NH4Cl反萃+三级NaOH、NaCl逆流反萃工艺研究。结果表明, 优化萃取条件为: 初始pH值8.5、萃取体系30%N263+5%仲辛醇+65%磺化煤油、萃取时间3 min、相比O/A=1∶1; 一段反萃优化条件为: NH₄Cl浓度2.0 mol/L、反萃相比O/A=5∶2、超声波功率500 W、反萃时间2 min; 二段反萃优化条件为: NaOH浓度1.0 mol/L、NaCl浓度0.5 mol/L、反萃相比O/A=3∶2、反萃时间3 min。以上优化条件下对浸出液进行钒的提取, 钒萃取率和反萃率分别为99.15%和99.36%, 对一段和二段反萃液进行钒产品回收, 可分别获得高纯V₂O₅产品(＞99.9%)和普通V₂O₅产品(＞99%)。

Separation and Extraction of Vanadium from Alkaline Leaching Solution of Spent Petrochemical Catalyst

A process consisting of three-stage countercurrent extraction with N263, one-stage ultrasonic-assisted back extraction with NH4Cl and three-stage countercurrent back extraction with NaOH and NaCl was proposed for the alkaline leaching solution of spent petrochemical catalyst. It is found that vanadium can be effectively extracted from the leaching solution under the following processing conditions, including an initial pH of 8.5, 30% N263+5% sec-octanol+65% sulfonated kerosene, extraction time of 3 min and O/A of 1∶1 for the extraction; NH₄Cl concentration of 2.0 mol/L, O/A of 5∶2, ultrasonic power of 500 W and back extraction time of 2 min for the first stage of back extraction; NaOH concentration of 1.0 mol/L, NaCl concentration of 0.5 mol/L, O/A of 3∶2 and back extraction time of 3 min for the second stage of back extraction. The extraction rate and back extraction rate of vanadium are 99.15% and 99.36%, respectively. Furthermore, the first and second stage of back extraction solution is then processed for vanadium recovery, yielding high purity V₂O₅ products (>99.9%) and ordinary V₂O₅ products (>99%), respectively.