Investigations into Recycling Zinc from Used Metal Oxide Varistors via pH Selective Leaching: Characterization, Leaching, and Residue Analysis
Metal oxide varistors (MOVs) are a type of resistor with significantly nonlinear current-voltage characteristics commonly used in power lines to protect against overvoltages. If a proper recycling plan is developed MOVs can be an excellent source of secondary zinc because they contain over 90 weight...
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| Format: | Article |
| Language: | English |
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Wiley
2015-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2015/653219 |
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| author | Toni Gutknecht Anna Gustafsson Christer Forsgren Christian Ekberg Britt-Marie Steenari |
| author_facet | Toni Gutknecht Anna Gustafsson Christer Forsgren Christian Ekberg Britt-Marie Steenari |
| author_sort | Toni Gutknecht |
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| description | Metal oxide varistors (MOVs) are a type of resistor with significantly nonlinear current-voltage characteristics commonly used in power lines to protect against overvoltages. If a proper recycling plan is developed MOVs can be an excellent source of secondary zinc because they contain over 90 weight percent zinc oxide. The oxides of antimony, bismuth, and to a lesser degree cobalt, manganese, and nickel are also present in varistors. Characterization of the MOV showed that cobalt, nickel, and manganese were not present in the varistor material at concentrations greater than one weight percent. This investigation determined whether a pH selective dissolution (leaching) process can be utilized as a starting point for hydrometallurgical recycling of the zinc in MOVs. This investigation showed it was possible to selectively leach zinc from the MOV without coleaching of bismuth and antimony by selecting a suitable pH, mainly higher than 3 for acids investigated. It was not possible to leach zinc without coleaching of manganese, cobalt, and nickel. It can be concluded from results obtained with the acids used, acetic, hydrochloric, nitric, and sulfuric, that sulfate leaching produced the most desirable results with respect to zinc leaching and it is also used extensively in industrial zinc production. |
| format | Article |
| id | doaj-art-96bcd85aeff1454fb820e5c5b27e02e8 |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-96bcd85aeff1454fb820e5c5b27e02e82025-02-03T06:06:16ZengWileyThe Scientific World Journal2356-61401537-744X2015-01-01201510.1155/2015/653219653219Investigations into Recycling Zinc from Used Metal Oxide Varistors via pH Selective Leaching: Characterization, Leaching, and Residue AnalysisToni Gutknecht0Anna Gustafsson1Christer Forsgren2Christian Ekberg3Britt-Marie Steenari4Industrial Materials Recycling, Department of Chemical Engineering, Chalmers University of Technology, Kemivägen 4, 412 96 Gothenburg, SwedenIndustrial Materials Recycling, Department of Chemical Engineering, Chalmers University of Technology, Kemivägen 4, 412 96 Gothenburg, SwedenStena Metall AB, Fiskhamnsgatan 8D, Box 4088, 400 40 Gothenburg, SwedenIndustrial Materials Recycling, Department of Chemical Engineering, Chalmers University of Technology, Kemivägen 4, 412 96 Gothenburg, SwedenIndustrial Materials Recycling, Department of Chemical Engineering, Chalmers University of Technology, Kemivägen 4, 412 96 Gothenburg, SwedenMetal oxide varistors (MOVs) are a type of resistor with significantly nonlinear current-voltage characteristics commonly used in power lines to protect against overvoltages. If a proper recycling plan is developed MOVs can be an excellent source of secondary zinc because they contain over 90 weight percent zinc oxide. The oxides of antimony, bismuth, and to a lesser degree cobalt, manganese, and nickel are also present in varistors. Characterization of the MOV showed that cobalt, nickel, and manganese were not present in the varistor material at concentrations greater than one weight percent. This investigation determined whether a pH selective dissolution (leaching) process can be utilized as a starting point for hydrometallurgical recycling of the zinc in MOVs. This investigation showed it was possible to selectively leach zinc from the MOV without coleaching of bismuth and antimony by selecting a suitable pH, mainly higher than 3 for acids investigated. It was not possible to leach zinc without coleaching of manganese, cobalt, and nickel. It can be concluded from results obtained with the acids used, acetic, hydrochloric, nitric, and sulfuric, that sulfate leaching produced the most desirable results with respect to zinc leaching and it is also used extensively in industrial zinc production.http://dx.doi.org/10.1155/2015/653219 |
| spellingShingle | Toni Gutknecht Anna Gustafsson Christer Forsgren Christian Ekberg Britt-Marie Steenari Investigations into Recycling Zinc from Used Metal Oxide Varistors via pH Selective Leaching: Characterization, Leaching, and Residue Analysis The Scientific World Journal |
| title | Investigations into Recycling Zinc from Used Metal Oxide Varistors via pH Selective Leaching: Characterization, Leaching, and Residue Analysis |
| title_full | Investigations into Recycling Zinc from Used Metal Oxide Varistors via pH Selective Leaching: Characterization, Leaching, and Residue Analysis |
| title_fullStr | Investigations into Recycling Zinc from Used Metal Oxide Varistors via pH Selective Leaching: Characterization, Leaching, and Residue Analysis |
| title_full_unstemmed | Investigations into Recycling Zinc from Used Metal Oxide Varistors via pH Selective Leaching: Characterization, Leaching, and Residue Analysis |
| title_short | Investigations into Recycling Zinc from Used Metal Oxide Varistors via pH Selective Leaching: Characterization, Leaching, and Residue Analysis |
| title_sort | investigations into recycling zinc from used metal oxide varistors via ph selective leaching characterization leaching and residue analysis |
| url | http://dx.doi.org/10.1155/2015/653219 |
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