Modelling the Effect of Solution Composition and Temperature on the Conductivity of Zinc Electrowinning Electrolytes
Zinc electrowinning is an energy-intensive step of hydrometallurgical zinc production in which ohmic drop contributes the second highest overpotential in the process. As the ohmic drop is a result of electrolyte conductivity, three conductivity models (<i>Aalto-I</i>, <i>Aalto-II&l...
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| Autores principales: | , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/3363ae63abfd44a7a7d071d781cd1581 |
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| Sumario: | Zinc electrowinning is an energy-intensive step of hydrometallurgical zinc production in which ohmic drop contributes the second highest overpotential in the process. As the ohmic drop is a result of electrolyte conductivity, three conductivity models (<i>Aalto-I</i>, <i>Aalto-II</i> and <i>Aalto-III</i>) were formulated in this study based on the synthetic industrial electrolyte conditions of Zn (50–70 g/dm<sup>3</sup>), H<sub>2</sub>SO<sub>4</sub> (150–200 g/dm<sup>3</sup>), Mn (0–8 g/dm<sup>3</sup>), Mg (0–4 g/dm<sup>3</sup>), and temperature, <i>T</i> (30–40 °C). These studies indicate that electrolyte conductivity increases with temperature and H<sub>2</sub>SO<sub>4</sub> concentration, whereas metal ions have negative effects on conductivity. In addition, the interaction effects of temperature and the concentrations of metal ions on solution conductivity were tested by comparing the performance of the linear model (<i>Aalto-I</i>) and interrelated models (<i>Aalto-II</i> and <i>Aalto-III</i>) to determine their significance in the electrowinning process. Statistical analysis shows that <i>Aalto-I</i> has the highest accuracy of all the models developed and investigated in this study. From the industrial validation, <i>Aalto-I</i> also demonstrates a high level of correlation in comparison to the other models presented in this study. Further comparison of model <i>Aalto-I</i> with the existing published models from previous studies shows that model <i>Aalto-I</i> substantially improves the accuracy of the zinc conductivity empirical model. |
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