Abstract
SummaryA recently developed electrolytic system is described for the cathodic removal of metal from dilute process solutions. The cell comprises a static cylindrical cathode concentrically arranged around an anode; flow through the annulus is turbulent with a superimposed helical pattern, promoting a high rate of mass transport. A laboratory evaluation of a prototype device is described, assessing the removal of gold from two spent metal finishing process liquors. Despite low initial gold levels (360 and 140mg dm−3), the device is effective in removing metal from solution. During batch trials, the gold concentration decayed in an essentially exponential fashion. Final gold concentration as low as 0.55 and 1.2mg dm−3 could be obtained. The design philosophy of this cell is discussed and comparison is made with other electrolytic reactors. Its simple, stationary, 2-dimensional cathode in a cell without moving parts has advantages over certain more elaborate designs. Features of the cell include rapid, convenient metal product removal, a compact modular, robust design and semi-automatic operation.
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