UDC 669.054:669.27/29
G. Kolobov (1), professor, c.t.s.
T. Nesterenko (1),
associate professor, c.t.s.
V. Pavlov (2), main engineer, c.t.s.
А. Каrpenko (1), assistant

TECHNOLOGIES OF AFFINAGE FOR REFRACTORY RARE METALS
V GROUP
(1) Zaporozhe state engineering academy, Ukraine,
(2) Pilot-production plant SE «State research and project institute of titan», Zaporozhe, Ukraine
There are considered technologies of affinage for refractory rare metals of V group for
the periodic system of elements: vanadium, niobium and tantalum. The methods of cleaning
of vanadium and tantalum from impurities are expounded briefly with references in works,
where these methods are considered with sufficient plenitude. Technologies of affinage for
niobium are analyzed in detail with pointing of technological parameters for separate operations
and estimation of efficiency of technology on the whole, the methods of electrolytic and
iodide affinages, cathode-ray melting, floating-zone refining with the receipt of monocrystals
and combined methods, allowing to get niobium of maximally high degree of cleanness for the
spe-cial aims, are here considered.
Keywords: vanadium, niobium, tantalum, electrolytic and iodide affinage, cathoderay
and zone melting, electrotransfer, sprayed targets.
TECHNOLOGIES OF AFFINAGE FOR REFRACTORY RARE METALS V GROUP