The floating-zone refining of hafnium taking into account the impurity evaporation
Keywords:
hafnium, crucibleless float-zone recrystallization, impurity, evaporation, refiningAbstract
The calculation efficiency method of hafnium refining by crucibleless float-zone recrystallization method in high vacuum taking into account the impurity evaporation is conducted. For the i-th impurity an effective distribution coefficient kэфi, an evaporation factor gi and a change in the relative concentration Cngi /Coi after the n-th number of passes for the quasi-stationary ingot field are calculated. The efficiency of floating-zone method for purification of hafnium from metallic and gas-forming impurities was experimentally confirmed. Hafnium samples with purity 99.88 wt% were obtained. Process obtaining flowsheet of high-purity transition metal samples was developed.
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