Abstract
A combined process of electrolysis of CaO in molten CaCl2 and calciothermic reduction, the so called OS process, was applied to prepare metallic vanadium directly from V2O3. Fine metallic powder containing 1860 wt ppm oxygen was obtained using a 0·5 mol.-%CaO–CaCl2 melt following processing for 10·8 ks (3 h) at 1173 K. The oxygen level did not decrease further even when the applied charge was doubled. Because metallic vanadium can be electrochemically deoxidised to 10 ppm oxygen from 1·48%, the high oxygen content in the reduced powder was attributed to the large amount of byproduct CaO due to reduction and the large surface area of the fine particles.
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