Abstract
A novel process of solid-oxide-oxygen-ion conducting membrane (SOM) technique has been investigated to produce Ta metal directly from solid Ta2O5 in mixture molten of 55.5MgF2-44.5CaF2 (in wt%). The sintered porous Ta2O5 pellet was employed as the cathode while liquid copper, saturated with graphite powder and encased in a one-end-closed yttria-stabilized-zirconia (YSZ) tube, acted as the anode. An electrolysis potential higher than that in Fray–Farthing–Chen (FFC) Cambridge process could be applied to this process because YSZ membrane blocked the electrolysis of the melts and there was no need for flux to dissolve Ta2O5. The results demonstrated that the electrolytic temperature have played important roles in this electrochemical process. Furthermore, this process can be used to efficiently produce Ta metal without the expensive pre-electrolysis and generation of harmful byproducts.
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