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在1mol/l HNO_3-1×10~(-8)mol/l Nb中加入5×10~(-5)-1×10~(-1)mol/l不同浓度的钼,分别用TBP,HDBP和7402季铵盐萃取铌,与水相不含钼相比较,观察到钼的存在对萃取铌有明显的影响。这影响主要表现在铌的萃取分配系数(D_(Nb))增加和萃取机理发生变化。对于不同的萃取剂,使D~(Nb)增加所需要的钼浓度亦不同,尤其是7402季铵盐萃取时受影响更为显著。还研究了萃取剂、硝酸及硝酸根等浓度与D_(Nb)的关系,并且讨论了萃取机理。
Different concentrations of molybdenum (5 × 10 -5 mol·L -1) mol / l molybdenum were added to 1 mol / l HNO 3 -1 × 10 -8 mol / l Nb, And 7402 quaternary ammonium extract niobium, compared with the aqueous phase without molybdenum, the presence of molybdenum was observed on the extraction of niobium have a significant impact. This effect is mainly reflected in the niobium extraction partition coefficient (D_ (Nb)) increase and the extraction mechanism changes. For different extractants, the D (Nb) required to increase the concentration of molybdenum is also different, especially when the 7402 quaternary ammonium extraction is more significantly affected. The relationship between extractant, nitric acid and nitrate concentration and D_ (Nb) was also studied, and the extraction mechanism was also discussed.