A novel process of solid-oxide-oxygen-ion conducting membrane (SOM) technique has been investigated to produce Ta metal directly from Ta2O5 in molten CaCl2. 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. The particle sizes and porosity of the cathode pellets are important factors that have significant impact on the electrolysis process. The optimal experimental conditions is pellet sintering and electrolytic temperature 1100°C, cell voltage 3.5V, electrolysis time 2h.
Extraction metallurgy level alumina from fly ash through high-pressure leaching, removing iron, crystallizing and roasting processes were considered. The optimum conditions of high-pressure leaching, removing iron and roasting processes were obtained by experiments. The leaching rate of Al2O3can reach 93.1% and the purity of Al2O3product can reach above 98% under these conditions. The iron content in Al2(SO4)3solution can decrease from 1.21% to 0.10% when fly ash as alkaline agents.
Tantalum metal was prepared by Solid Oxygen-ion Conducting Membrane (SOM) technology from Ta2O5 directly in molten CaCl2. Through reaction mechanism of the metal-oxide-electrolyte three-phase interline (3PIs), the influence of pellets microstructure on the electrolysis process and products morphology were discussed. The results demonstrate that forming pressure, particle size and porosity of cathode pellets are significant factors for three-phase interline during electrolysis process. It was found that the big porosity and small particle can enhance the deoxidization rate, Contrarily, the compact out-layer of tantalum metal was formed. While the Ta2O5 pellet was pressed by 4MPa and sintered at 1150°C for 2 h has rational porosity and particle, the electrochemical reduction can be achieved via two steps: Ta2O5Ta2O5-xTa.
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