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Factors Influencing the Direct Electrochemical Reduction of Nb_2O_5 Pellets to Nb Metal in Molten Chloride Salts 被引量:2
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作者 D.Sri Maha Vishnu N.Sanil +1 位作者 K.S.Mohandas k.nagarajan 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2017年第3期218-227,共10页
Powder compacted and sintered Nb205 pellets were cathodically polarised against graphite anode in calcium chloride melt at 1173 K to study the influence of various factors on the electrochemical reduction of the oxide... Powder compacted and sintered Nb205 pellets were cathodically polarised against graphite anode in calcium chloride melt at 1173 K to study the influence of various factors on the electrochemical reduction of the oxide. The parameters were; duration and temperature of electrolysis, open porosity of pellets, nature of anode, mode of electrolysis and configuration of the oxide cathode. The experiments were also conducted in KC1, KC1-25 tool% CaC12 and NaC1 melts to understand the effect of melt composition on the electroreduction. Different Ca-Nb-O and Nb-O intermediates were found in the pellets electrolysed for different durations of time in CaC12 melt which eventually reduced to Nb. The current efficiency of the process decreased with increasing duration of electrolysis. Decrease in electrolysis temperature from 1 173 to 1073 K led to the decrease in the rate of reduction of the oxide pellets. Pellets with high open porosity reduced faster. Carbon contamination of the melt was relatively less when pyrolytic graphite was used as anode. Of all the melts studied, the reduction was found to be better in calcium chloride melt, that too when alumina crucible was used as container of the melt. 展开更多
关键词 Fray-Farthing-Chen (FFC) Cambridge process Electrochemical reduction Open porosity Niobium pentoxide Calcium chloride
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