(稀美資源(廣東)有限公司，清遠(yuǎn) 513055)
摘 要: 采用TBP-仲辛醇混合萃取劑對鉭鈮礦萃余液中低濃度鉭、鈮和鎢等有價(jià)資源進(jìn)行綜合回收。研究TBP與仲辛醇的體積比、稀釋劑含量、溶液酸度、萃取相比、萃取溫度以及萃取時(shí)間等因素對鉭、鈮和鎢回收率及分相時(shí)間的影響規(guī)律。結(jié)果表明：TBP-仲辛醇混合萃取劑對鉭鈮礦萃余液中低濃度鉭、鈮和鎢具有較好的協(xié)同萃取效果。單因素實(shí)驗(yàn)結(jié)果表明，TBP與仲辛醇體積比控制在1:1時(shí)比較合適。在此條件下，進(jìn)一步通過正交實(shí)驗(yàn)確定最優(yōu)實(shí)驗(yàn)方案：稀釋劑20%，H+濃度16 mol/L，相比2:1，溫度25 ℃，萃取反應(yīng)時(shí)間4 min。在最優(yōu)條件下，鉭鈮的總回收率為98.53%，鎢的回收率為89.62%，綜合回收效果較為理想。
關(guān)鍵字: TBP-仲辛醇；鉭鈮礦；萃余液；鉭；鈮；鎢；綜合回收
（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
