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- W891638 abstract "The electrodeposition of zinc from acidic zinc sulphate solutions was studied under forced convection conditions at current densities up to 10,000 A/m2. On the laboratory scale (5 A), the deposition was carried out on aluminium rotating cylinder electrodes of ˜5 cm2; the anode consisted of a concentric open cylinder of platinum mesh. On the small technical scale (50 A), a parallel-plate cell was employed for batch tests, and drum cells were used for the continuous production of zinc strip; either silver-lead anodes or dimensionally stable anode (DSA) materials were employed. Solutions (usually 1.0M ZnSO4/1.8M H2SO4) were prepared either by dissolving technical grade zinc oxide in analytical reagent grade sulphuric acid, or by dilution and acidification of plant “purified neutral” solution. The faradaic efficiency (FE) and specific energy consumption for zinc electrodeposition were determined as a function of current density, temperature and electrode rotation rate/s lution flow velocity. The effects of changing zinc sulphate and sulphuric acid concentrations were also investigated. Similar faradaic efficiencies were obtained in all three cells under comparable operating conditions, although the values found in the parallel-plate cell were 1–2% higher than in the other two. Under the likely operating conditions for a full-scale cell (5000 A/m2, 50°C, 1 m/s flow velocity) the FE was 90–95%. At the small technical scale, with silver-lead anodes, the energy consumption was 3.1–3.6 kWh/kg of zinc, depending on the temperature and interelectrode gap. In the laboratory and parallel-plate cells, it was found that, as expected, the FE decreased with increasing sulphuric acid concentration (at fixed total sulphate concentration)." @default.
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- W891638 date "1990-01-01" @default.
- W891638 modified "2023-10-06" @default.
- W891638 title "HIGH INTENSITY ZINC ELECTROWINNING AT THE LABORATORY AND SMALL TECHNICAL SCALE" @default.
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- W891638 doi "https://doi.org/10.1016/b978-0-08-040430-1.50014-6" @default.
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