Application of Mixed Potential Theory to Leaching of Mineral Phases
Leaching is a central unit operation in the hydrometallurgical processing of minerals, which often occurs by means of electrochemical reactions. Application of mixed potential theory to explain the kinetics of oxidative and reductive leaching processes is a useful concept in explaining observed resu...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-06-01
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| Series: | Reactions |
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| Online Access: | https://www.mdpi.com/2624-781X/3/2/23 |
| _version_ | 1797482904590221312 |
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| author | César A. C. Sequeira |
| author_facet | César A. C. Sequeira |
| author_sort | César A. C. Sequeira |
| collection | DOAJ |
| description | Leaching is a central unit operation in the hydrometallurgical processing of minerals, which often occurs by means of electrochemical reactions. Application of mixed potential theory to explain the kinetics of oxidative and reductive leaching processes is a useful concept in explaining observed results. Native metals, selected oxides, and most base metal sulfides are electron-conducting phases. For these minerals, leaching may take place by normal corrosion, passivation or galvanic couple mechanisms, which provide individual electrode kinetics enabling the calculation of mixed potentials and overall reaction kinetics. Examples of the electrochemical nature of selected leaching processes are presented and include the effect of mixed potentials, geometry, and associated kinetic reactions. |
| first_indexed | 2024-03-09T22:39:14Z |
| format | Article |
| id | doaj.art-f62c8f494ab54818a95d09a1602b6327 |
| institution | Directory Open Access Journal |
| issn | 2624-781X |
| language | English |
| last_indexed | 2024-03-09T22:39:14Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Reactions |
| spelling | doaj.art-f62c8f494ab54818a95d09a1602b63272023-11-23T18:43:55ZengMDPI AGReactions2624-781X2022-06-013231232810.3390/reactions3020023Application of Mixed Potential Theory to Leaching of Mineral PhasesCésar A. C. Sequeira0Department of Chemical Engineering, Instituto Superior Técnico, University of Lisbon, 1049-001 Lisbon, PortugalLeaching is a central unit operation in the hydrometallurgical processing of minerals, which often occurs by means of electrochemical reactions. Application of mixed potential theory to explain the kinetics of oxidative and reductive leaching processes is a useful concept in explaining observed results. Native metals, selected oxides, and most base metal sulfides are electron-conducting phases. For these minerals, leaching may take place by normal corrosion, passivation or galvanic couple mechanisms, which provide individual electrode kinetics enabling the calculation of mixed potentials and overall reaction kinetics. Examples of the electrochemical nature of selected leaching processes are presented and include the effect of mixed potentials, geometry, and associated kinetic reactions.https://www.mdpi.com/2624-781X/3/2/23leaching mechanismdissolutiongalenagoldsilverpyrite |
| spellingShingle | César A. C. Sequeira Application of Mixed Potential Theory to Leaching of Mineral Phases Reactions leaching mechanism dissolution galena gold silver pyrite |
| title | Application of Mixed Potential Theory to Leaching of Mineral Phases |
| title_full | Application of Mixed Potential Theory to Leaching of Mineral Phases |
| title_fullStr | Application of Mixed Potential Theory to Leaching of Mineral Phases |
| title_full_unstemmed | Application of Mixed Potential Theory to Leaching of Mineral Phases |
| title_short | Application of Mixed Potential Theory to Leaching of Mineral Phases |
| title_sort | application of mixed potential theory to leaching of mineral phases |
| topic | leaching mechanism dissolution galena gold silver pyrite |
| url | https://www.mdpi.com/2624-781X/3/2/23 |
| work_keys_str_mv | AT cesaracsequeira applicationofmixedpotentialtheorytoleachingofmineralphases |