Abstract
A fundamental study was conducted on a new process for producing vanadium (V) metal by the preform reduction process (PRP) based on metallothermic reduction of vanadium pentoxide (V 2 O 5 ). Feed preforms with good mechanical strength even at elevated temperatures were prepared by adding either CaO or MgO to V 2 O 5 feed powder because V 2 O 5 has a low melting point of 963 K; thus complex oxides (Ca x V y O z , Mg x V y O z ) with high melting point at more than 1273 K were obtained. Reduction experiments were conducted by using either Ca or Mg vapor at 1273 K for 6 h. V metal with a purity of more than 99% was successfully obtained when using Mg as a reductant. The feasibility of producing V metal by the PRP will be discussed on the basis of fundamental experiments.
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