Tantalum electrowinning from molten fluorides: characterization of structure and defects

Moser K. D . The manufacture and fabrication of tantalum. J. Metals, N. Y., 51 (4), 1999, 29–31.

Dickmann H. and Gramberg U . Tantalum as construction material in the chemical industry. TIC Bull., 78, 1994, 2–5.

Rowe C. E. D . Tantalum and niobium in chemical applications. TIC Bull., 97, 1999, 2–5.

Cunningham L. D . Tantalum. Mineral facts and problems. Bull. U. S. Bur. Mines 675, 1985.

Anon. Tantalum supply and demand. TIC Bull., 96, 1998, 2–6.

Fukang M. and Youyi C . Tantalum industry in China. TIC Bull., 87, 1996, 2–5.

Borchers P. and Korinek J. K . The extractive metallurgy of tan-talum. TIC Bull., 27, 1981, 2–5.

Albrecht W. W . Improvements in the sodium process to produce tantalum powder. TIC Bull., 57, 1989, 4–5.

Lantelme F. , Barhoun A.G. Li and Besse J. P . Electrodeposition of tantalum in NaC1—KC1—K2TaF7 melts. J. electrochem. Soc., 139, 1992, 1249-55.

Lantelme F. , Berghoute Y. and Salmi A . Cyclic voltammetry at a metallic electrode: application to reduction of nickel, Tantalum and niobium salts in fused electrolytes. J. appL Electrochem., 24, 1994, 361–7.

Girginov A. , Tzvetkoff T. Z. and Bojinov M . Electrodeposition of refractory metals (Ti, Zr, Nb, Ta) from molten salts electrolytes. J. appL Electrochem., 25, 1995, 993–1003.

Fife J. A . Tantalum capacitors: improvements to volumetric efficiency. TIC Bull., 81, 1995, 5–8.

Paschen P . Energy consumption in the extractive metallurgy of niobium and tantalum. TIC Bull., 73, 1993, 4–7.

Mellors G. W. and Senderoff S . Electrodeposition of coherent deposits of refractory metals. I. Niobium. J. electrochem. Soc., 112, 1965, 266–72.

Senderoff S. , Mellors G. W. and Reinhart W. J . The electro-deposition of coherent deposits of refractory metals. II. The electrode reactions in the deposition of tantalum. J. electrochem. Soc., 112, 1965, 840–5.

Senderoff S. and Mellors G. W . Coherent coatings of refractory metals. Science, 153, 1966, 1475-81.

Senderoff S . Electrodeposition of refractory metals. Metall. Rev., 11, 1966, 97–112.

Inman D. , Sethi S. R. and Spencer R . The effects of complex ion formation and ionic adsorption on electrode reactions involving metals and metal ions in fused salts. J. electroanaL Chem., 29, 1971, 137–47.

Inman D. and White S. H . The production of refractory metals by the electrolysis of molten salts; design factors and limitations. J. appL Electrochem., 8, 1978, 375–90.

White S. H. and Twardoch U. M . The chemistry and electro-chemistry associated with the electroplating of group VIA transition metals. J. appL Electrochem., 17, 1987, 225–42.

Stern K. H. and Gadomski S. T . Electrodeposition of tantalum carbide coatings from molten salts. J. electrochem. Soc., 130, 1983, 300–5.

Taranenko V. Studies of the electroreduction of tantalum and niobium in fluorochloroaluminate melts. In Chemla M. and Devilliers D. eds Molten salt chemistry and technology (Zurich: Trans Tech Publ., 1991), 595-60 2.

Taxil P. and Mahenc J . Formation of corrosion-resistant layers by electrodeposition of refractory metals or by alloy electrowinning in molten fluorides. J. appL Electrochem., 17, 1987, 261–9.

da Silva F. T. and Dutra A. J. B . Thermodynamics and charac-terization of K2TaF7 precipitated from fluoride solutions. Trans. Instn Min. Metall. (Sect. C: Mineral Process. Extr. Metall.), 108, 1999, C162–6.

Espinola A. , Dutra A. J. B. and da Silva F. T . Mechanism of the electrochemical reduction of tantalum(v) in molten fluorides. Anal. Chim. Acta, 251, 1991, 53–8.

Grjotheim K. and Kvande H . Understanding the Hall-Heroult process for production of aluminium (Düsseldorf: Aluminium-Verlag, 1986), 112.

Konstantinov V . I and Matychenko E. S. Critical anodic cur-rent density in oxide—fluoride melts for tantalum production. Zhurn. Priklad. Khim., 46, 1973, 199–202.

Konstantinov V. I. and Karpenko O. A . Electrolytic production of tantalum from oxyfluoride—chloride electrolytes. Sot). J. non-ferrous Metals, 19 (7), 1978, 65–8.

Dutra A. J. B . Electrolytic extraction of tantalum in molten fluorides. D.Sc. thesis, UFRJ, Rio de Janeiro, 1989.

Ortner H. and Wilhartitz P . Ultra-pure refractory metals—facts and fiction. TIC Bull., 49, 1987, 5–7.

Broc M . Etude de revetements metalliques prepares par elec-trolyse ignee. Ph. D. thesis, Universite Pierre et Marie Curie, Paris, 1977.

Grjotheim K. and Welch B. J . Aluminium smelter technology. A pure and applied approach (Düsseldorf: Aluminium-Verlag, 1980), 52.

Dutra A. J. B. , Vazquez J. C. and Espinola A . Use of pulse cur-rents for tantalum electrowinning in molten fluorides. Minerals Engng, 6, 1993, 663–72.