Abstract
Bench-scale electrowinning of electrolytic manganese dioxide was carried out using the manganese sulfate electrolyte generated through SO2 leaching of low-grade ferruginous manganese ore. The effect of different electrowinning process parameters on the current efficiency and specific energy consumption was studied. Results indicated that the current density, electrolyte temperature, and free acid concentration of electrolyte have a strong effect on the current efficiency and specific energy consumption. An electrolyte temperature of 90 ± 2 °C, current density of 9 mA/cm2, anode-to-cathode distance of 3 cm, electrolyte’s initial pH of 6, and free acid concentration at 15 to 20 g/L were found to be the optimum conditions for EMD electrowinning. Under the optimized electrowinning conditions, a current efficiency of 93 pct and specific energy consumption of 1.4 kWh/kg EMD were realized. The produced EMD deposit was found to have a purity of 92.4 pct and a γ crystal structure.
| Original language | English (US) |
|---|---|
| Journal | Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science |
| DOIs | |
| State | Published - Oct 2022 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2022, The Minerals, Metals & Materials Society and ASM International.
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