| Exploratory research was conducted in high temperature metal extraction using a concentrating solar furnace for process heat. Electrolysis of zinc oxide was performed using various molten salts as electrolytes; 13% AlF(,3)/87% NaF, 45% AlF(,3)/55% NaF, 33% ZnF(,2)/67% NaF and NaOH. The temperature range investigated was 600 to 1400 K. Several materials were tried as crucibles and electrodes with the best being graphite for the cathode and crucible, and platinum for the anode. Experiments were performed where the zinc produced was collected and the current and voltage were measured. From this data, current efficiencies were calculated and decomposition potentials were determined. |
