Abstract
High current density zinc electrowinning was studied using high purity synthetic solutions using 50 dm exp -3 zinc and 150 dm exp -3 H sub 2 SO sub 4 . Cyclic voltammetry and galvanostatic methods were used for this investigation. The effects of high concentrations of copper, iron, manganese and SiO sub 2 on the current efficiency and cathodic zinc quality were evaluated. Gelatine was added separately and in combination with these impurities. A correlation between cyclic voltammetric data obtained and the current efficiency values was observed. The various deposit morphologies obtained under different conditions were studied using the scanning electron microscope.