Thermodynamic and kinetic study of the recovery of tungsten and cobalt from tool waste
| Autor: | Sebastián Sierra-Pérez, Nestor Ricardo Rojas-Reyes, José Martínez-Zambrano, Hugo Alfonso Rojas-Sarmiento |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Revista Facultad de Ingeniería Universidad de Antioquia, Iss 89 (2018) |
| Druh dokumentu: | article |
| ISSN: | 0120-6230 2422-2844 |
| Popis: | In the present research work, the recovery of tungsten and cobalt from waste coming from tungsten carbide-cobalt (WC-Co) tools, which are widely used in the metalworking industry, was analyzed. The WC-Co waste was characterized by X-ray diffraction and scanning electron microscopy with microanalysis (SEM/EDS). The process started with the oxidation of the waste to obtain a mixture of oxides (WO3 and CoWO4). The ΔH and ΔG were calculated both for the oxidation and reduction processes. Thermodynamic and non-isothermal kinetic analyses were carried out to obtain a stability diagram where theoretical and experimental data are defined by transformation lines as a function of temperature; in addition, the apparent activation energy was determined. By a hydrogen reduction process, high-purity tungsten and cobalt in metallic form were obtained. |
| Databáze: | Directory of Open Access Journals |
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