Thermodynamic and kinetic study of the recovery of tungsten and cobalt from tool waste

Keywords: Tungsten, Cobalt, OPT/RPT, thermodynamics, non-isothermic kinetics

Abstract

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.

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Author Biographies

Sebastian Sierra-Perez, Universidad Nacional de Colombia

Facultad de Minas, Departamento de Materiales y Minerales. Instituto de Minerales CIMEX.

Nestor Ricardo Rojas-Reyes, Universidad Nacional de Colombia

Facultad de Minas, Departamento de Materiales y Minerales. Instituto de Minerales CIMEX.

Director de Departamento

Jose Jobanny Martinez-Zambrano, Universidad Pedagógica y Tecnológica de Colombia

Facultad de Ciencias, Escuela de Ciencias Químicas

Director de Escuela

Hugo Alfonso Rojas-Sarmiento, Universidad Pedagógica y Tecnológica de Colombia

Facultad de Ciencias, Escuela de Ciencias Químicas

Vicerector Académico

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Published
2018-10-02
How to Cite
Sierra-Perez, S., Rojas-Reyes, N. R., Martinez-Zambrano, J. J., & Rojas-Sarmiento, H. A. (2018). Thermodynamic and kinetic study of the recovery of tungsten and cobalt from tool waste. Revista Facultad De Ingeniería Universidad De Antioquia, (89), 44-51. https://doi.org/10.17533/udea.redin.n89a06