(稀美资源(广东)有限公司，清远 513055)
摘 要: 采用TBP-仲辛醇混合萃取剂对钽铌矿萃余液中低浓度钽、铌和钨等有价资源进行综合回收。研究TBP与仲辛醇的体积比、稀释剂含量、溶液酸度、萃取相比、萃取温度以及萃取时间等因素对钽、铌和钨回收率及分相时间的影响规律。结果表明：TBP-仲辛醇混合萃取剂对钽铌矿萃余液中低浓度钽、铌和钨具有较好的协同萃取效果。单因素实验结果表明，TBP与仲辛醇体积比控制在1:1时比较合适。在此条件下，进一步通过正交实验确定最优实验方案：稀释剂20%，H+浓度16 mol/L，相比2:1，温度25 ℃，萃取反应时间4 min。在最优条件下，钽铌的总回收率为98.53%，钨的回收率为89.62%，综合回收效果较为理想。
关键字: TBP-仲辛醇；钽铌矿；萃余液；钽；铌；钨；综合回收
（Ximei Resources (Guangdong) Limited Company, Qingyuan 513055, China）
Abstract:The solvent extraction of Ta/Nb/W from Ta/Nb extraction raffinate was studied on a synergistic solvent extraction system by using TBP and 2-octanol as the extractants. The effects of volume ratio of TBP and 2-octanol, diluent content, solution acidity, extraction ratio, extraction temperature and extraction time on Ta, Nb and W recovery rates and phase separation time were investigated. The results show that the synergistic effect observed in the TBP and 2-octanol system has improved the extraction efficiency. Through single-factor, the volume ratio of TBP and 2-octanol of 1:1 is more appropriate. Under this condition, the optimal experimental is further confirmed by the orthogonal experiment with 20% of diluent, 16 mol/L of acidity, 2/1 of extraction ratio, 25 ℃ of extraction temperature and 4 min of extraction time. Under the optimal conditions, the total recovery rate of Ta+Nb is 98.53%, and the recovery rate of W is 89.62%. The comprehensive recovery is very good.
Key words: TBP-2-octanol; Ta/Nb extraction raffinate; tantalum/niobium; tungsten; comprehensive recovery
