Abstract
The BFE-type methanol anode was applied to zinc electrowinning. The anode gave a very high and stable performance and was hardly affected by the presence of zinc ions and sulfuric acid under practical operational conditions. In the electrowinning experiment with a cell having a 16 mm electrode spacing, the input cell voltage was 1.8–1.7 V at 125 mA cm −2, which was smaller by more than 1.5 V in comparison with that of conventional cells, resulting from the lower thermodynamic cell voltage and the lower ohmic drop in the electrolyte. The latter can still be reduced by 0.15 V by reducing the electrode spacing. The presence of a small amount of gelatin inhibited the anode performance. It was found that a relatively smooth surface of zinc was obtained without gelatin and the current efficiency was 91%, which is comparable to that of conventional processes. Thus, application of the BFE anode seems to be extremely attractive in energy saving, that is, more than 50%.
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