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介绍了伯胺和磷酸三丁酯协同萃取回收铼的实验研究,考察了水相初始pH值、萃取剂组成、相比(O/W)对铼萃取率的影响。结果表明:协同萃取体系在pH 2～10范围内铼的萃取率均在97%以上,但酸性条件下伯胺N1923溶解损失较大,水相初始pH 9.5为最佳萃取酸度,以有机相30%N1923-50%TBP-20%磺化煤油萃取铼效果最佳,并采用3%NaOH反萃铼,萃取和反萃相比均控制1∶1。铼的萃取率可达99%以上,反萃率达97%以上。萃取分配比随水相中铼初始含量增大而越大,水相中大量铀的存在不影响铼的萃取,硝酸根的存在对铼的萃取率也影响较小。硫酸地浸采铀工艺中,铀和铼分别以[UO2(SO4)2]2-,[UO2(SO4)3]4-,ReO 4-阴离子形式转入地浸液,同时被阴离子交换树脂D231吸附。适采用一定浓度硝酸盐或氯化物解吸铀工艺树脂中的铀,以10%NH4NO3-8%NH4OH解吸树脂中的铼。伯胺和磷酸三丁酯协同萃取法可有效用于铀工艺树脂解吸液中铼的回收,从而为铀矿中铼的回收进一步工业试验提供参数。
This paper introduced the synergistic extraction of rhenium from primary amine and tributyl phosphate, and investigated the influence of the initial pH of the aqueous phase, the composition of the extractant and the ratio of O / W on rhenium extraction. The results showed that the extraction rate of rhenium in the synergistic extraction system was over 97% at the pH range of 2 ~ 10, but the dissolution loss of the primary amine N1923 was greater under the acidic conditions. The initial pH 9.5 of the aqueous phase was the optimum extraction acidity. % N1923-50% TBP-20% sulfonated kerosene extraction rhenium best, and the use of 3% NaOH stripping rhenium, extraction and stripping compared to control 1: 1. Rhenium extraction rate of up to 99%, stripping rate of 97% or more. The extraction distribution ratio increases with the initial rhenium content in the aqueous phase, and the presence of a large amount of uranium in the aqueous phase does not affect the extraction of rhenium. The presence of nitrate also has a small effect on the rhenium extraction rate. Sulfuric acid leaching process of uranium, uranium and rhenium were [UO2 (SO4) 2] 2 -, [UO2 (SO4) 3] 4-, ReO4- anion form into the ground immersion, while the anion exchange resin D231 Adsorption. Suitable concentration of nitrate or chloride desorption process uranium uranium resin, 10% NH4NO3-8% NH4OH desorption rhenium resin. The synergistic extraction of primary amines and tributyl phosphate can be used for the recovery of rhenium in desorption solution of uranium resin, which can provide parameters for the further industrial test of rhenium recovery in uranium ore.