Abstract
A systematic laboratory study was conducted on current efficiency and corrosion obtained in cryolite–alumina melts with SnO2–Sb2O3–CuO ceramic inert anodes. The current efficiency (CE) was determined by measuring the total amount of oxygen evolved at the anode and was found to be ~95%. The influence of operating parameters (inter-electrode distance, temperature and current density) was evaluated. The quantitative interdependencies as well as the ranges of CE optimal values were established (2–3cm, 940–960°C and 0.7–0.8A·cm−2). The corrosion process of these anodes was evaluated by the mass loss method. The evaluation also took care of the corrosion data, as the problem of the anode corrosion appeared to be the main obstacle for the use of those anodes in the commercial cells. Lowering of the ACD up to 2cm did not aggravate anode corrosion.
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