The calculation of cathode current efficiency and metal loss in a small alumina reduction cell.
Cammarota-VA Jr.; Schlain-D
J Electrochem Soc 1970 Feb; 117(2):282-288
Experimental data from a small Hall cell were used to show the relationship between the cathode current efficiency and the carbon monoxide-carbon dioxide content of the anodic gas. The equation, CE = 0.45 (% CO2) + 47.6, was developed and shown to give reliable estimates of aluminum production. In this equation, the volume per cent of carbon dioxide is corrected for the Boudouard reaction which varies in amount with anode type and operating conditions. A second and equally effective equation is, CE = Anode CE - EL, where Anode CE is based on the oxygen in the anodic gases and EL is metal efficiency loss resulting from solubility and vaporization. The minimum value of EL is the solubility of metal in the electrolyte, which in the small cell was estimated to be 0.12%. Calculations made with experimental and literature data show that under industrial conditions the Pearson and Waddington equation gives good estimates of cathode current efficiency, because the lower efficiency indicated by the excess carbon monoxide from the Boudouard reaction compensates for the EL factor.
Mining-industry; Mineral-processing; Metals; Aluminum-compounds;
Author Keywords: aluminium; cells (electric); electrochemical electrodes; electric current; Hall effect devices; productivity; electrolysis; losses
OP; Journal Article
Journal of the Electrochemical Society