FIELD: iodide refining of hafnium.
SUBSTANCE: interaction of iodine with black metal is carried out at temperature of 250-350°C. Sedimentation of refined hafnium is carried out at temperature of 1200-1600°C on heater (filament) made from molybdenum or zirconium wire in form of one or several loops connected to electrode end-pieces. Heater is formed in iodide refining apparatus in such way that lower part of each wire loop is suspended above insulator surface at clearance equal to 1/3-1/2 of final thickness of bar. Proposed method may be used for production of iodide hafnium bars more than 17 mm in diameter at height of heater loop more than 0.8 m.
EFFECT: enhanced purity by admixtures.
4 cl, 1 tbl, 3 ex
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