A STUDY OF SOLVENT EXTRACTION OF NIOBIUM FROM NITRIC ACID SOLVTION Ⅲ. THE EXTRACTION OF NIOBIUM WITH IRRADIATED TBP

The paper describes the behaviour of extraction of niobium with irradiatedTBP from different aqueous solutions, and washing of niobium in loading organicphase. The irradiated TBP bore the doses at 1×10~3～7.5×10~5 Gy. The effect ofmolybdenum and uranium and flourine on the extraction of niobum with irradiatedTBP is shown. It was observed that an interfacial crud has not relevance to D_(Nb)but niobium--95 adsorbs on the interfacial crud. HDBP causes increasing D_(Nb) in theextraction of niobium with irradiated TBP. There is an antisynergism between TBPand HDBP in extraction, it limits extraction of niobium with TBP irradiated. Mo-lybdenum in aqueous phase weakens the antisynergism between TBP and HDBP inextraction, so that molybdenum can promote that D_(Nb) increases with irradiated doseof TBP.