Palladium recovery from monolithic ceramic capacitors by leaching, solvent extraction and reduction
| Autor: | Massimiliana Pietrantonio, Federica Masi, Giorgia Nadia Torelli, Stefano Pucciarmati, Danilo Fontana, Chiara Bonomi |
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| Rok vydání: | 2017 |
| Předmět: |
Lixiviant
Materials science Metallurgy chemistry.chemical_element 02 engineering and technology 010501 environmental sciences Aliquat 336 01 natural sciences Diluent 020501 mining & metallurgy chemistry.chemical_compound Sodium borohydride 0205 materials engineering chemistry Chemical engineering Mechanics of Materials Aqua regia Leaching (metallurgy) Ceramic capacitor Waste Management and Disposal 0105 earth and related environmental sciences Palladium |
| Zdroj: | Journal of Material Cycles and Waste Management. 20:1199-1206 |
| ISSN: | 1611-8227 1438-4957 |
| Popis: | Palladium finds a remarkable use in electronic devices and catalysts; therefore, an efficient and complete recovery from the containing secondary materials assumes a great relevance. The present paper discusses recovery of palladium (Pd) contained in monolithic ceramic capacitors from waste printed circuit boards (PCBs) of electrical and electronic equipment by hydrometallurgical techniques. Samples, after a milling step, were leached by aqua regia varying the operative conditions. Parameters such as lixiviant concentration, solid/liquid ratio and temperature were investigated. Pd was separated from the leach solution by solvent extraction using Aliquat 336 as an extractant in limonene. This solvent was studied as alternative to the usual ones because it is a renewable organic diluent, with low-toxicity and easily available. After the extraction the organic phase was treated with sodium borohydride to precipitate metallic palladium obtaining a recovery rate of 83% with a purity grade of 98.8%. Based on the results of the present study, a process flow sheet was proposed for industrial implementation. |
| Databáze: | OpenAIRE |
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