| US3011866A
              (en)
            
            * | 1958-01-10 | 1961-12-05 | James O Gibson | Separation of columbium and tantalum | 
        
          | US3053620A
              (en)
            
            * | 1958-02-12 | 1962-09-11 | Nat Distillers Chem Corp | Purification method for metal halides | 
        
          | US3038781A
              (en)
            
            * | 1958-09-25 | 1962-06-12 | Ciba Ltd | Process for the purification of tantalum pentachloride | 
        
          | US3066010A
              (en)
            
            * | 1959-04-13 | 1962-11-27 | Stauffer Chemical Co | Purification of metal chlorides | 
        
          | US3085855A
              (en)
            
            * | 1961-03-15 | 1963-04-16 | Cons Mining & Smelting Co | Process for the production of niobium pentachloride | 
        
          | US3294482A
              (en)
            
            * | 1963-01-28 | 1966-12-27 | Dominion Gulf Company | Process for recovering metal chlorides from gaseous mixtures | 
        
          | US3201208A
              (en)
            
            * | 1963-07-05 | 1965-08-17 | Chemical Products Corp | Method of producing anhydrous inorganic compounds | 
        
          | CH485600A
              (de)
            
            * | 1965-05-22 | 1970-02-15 | Starck Hermann C Fa | Verfahren zur Herstellung hochreiner Chloride von V, Mo, W, Ta, Nb, Ti und B | 
        
          | US3729543A
              (en)
            
            * | 1971-01-21 | 1973-04-24 | Dunn Inc Wendell E | Process for preparing alkali-metal tetra-chloroferrate | 
        
          | US4065405A
              (en)
            
            * | 1976-12-03 | 1977-12-27 | Exxon Research And Engineering Company | Recovery of tantalum and/or niobium pentafluorides from a hydrocarbon conversion catalyst | 
        
          | US4749448A
              (en)
            
            * | 1986-12-18 | 1988-06-07 | Westinghouse Electric Corp. | Zirconium and hafnium tetrachloride separation by extractive distillation with molten zinc chloride calcium and/or magnesium chloride solvent | 
        
          | US4737244A
              (en)
            
            * | 1986-12-18 | 1988-04-12 | Westinghouse Electric Corp. | Zirconium and hafnium tetrachloride separation by extractive distillation with molten zinc chloride lead chloride solvent | 
        
          | US4865695A
              (en)
            
            * | 1988-09-12 | 1989-09-12 | Westinghouse Electric Corp. | Preparation of complexes of zirconium and hafnium tetrachlorides with phosphorus oxychloride | 
        
          | US4874475A
              (en)
            
            * | 1988-09-12 | 1989-10-17 | Westinghouse Electric Corp. | Molten salt extractive distillation process for zirconium-hafnium separation | 
        
          | US4865694A
              (en)
            
            * | 1988-09-12 | 1989-09-12 | Westinghouse Electric Corp. | Electrochemical decomposition of complexes of zirconium or hafnium | 
        
          | US4865693A
              (en)
            
            * | 1988-09-12 | 1989-09-12 | Westinghouse Electric Corp. | Preparation of complexes of zirconium and hafnium tetrachlorides with phosphorus oxychloride | 
        
          | US4865696A
              (en)
            
            * | 1988-09-12 | 1989-09-12 | Westinghouse Electric Corp. | Recovery of metal chlorides from their complexes by molten salt displacement | 
        
          | US4913778A
              (en)
            
            * | 1989-01-02 | 1990-04-03 | Westinghouse Electric Corp. | Molten salt scrubbing of zirconium or hafnium tetrachloride | 
        
          | FR2823740B1
              (fr)
            
            * | 2001-04-18 | 2004-02-06 | Cezus Co Europ Zirconium | Procede de separation des tetrachlorures de zirconium et de hafnium | 
        
          | CN112891973B
              (zh)
            
            * | 2021-01-15 | 2022-09-13 | 中国科学院上海应用物理研究所 | 一种降低卤化物熔盐中氧含量的方法 |