| Autor: |
Cerecedo-Sáenz E; Academic Area of Earth Sciences and Materials, Institute of Basic Sciences and Engineering, Autonomous University of the State of Hidalgo, Highway Pachuca-Tulancingo, km. 4.5, Mineral de la Reforma, Pachuca 42184, Mexico., Cárdenas-Reyes EA; Academic Area of Earth Sciences and Materials, Institute of Basic Sciences and Engineering, Autonomous University of the State of Hidalgo, Highway Pachuca-Tulancingo, km. 4.5, Mineral de la Reforma, Pachuca 42184, Mexico., Rojas-Calva AH; Academic Area of Earth Sciences and Materials, Institute of Basic Sciences and Engineering, Autonomous University of the State of Hidalgo, Highway Pachuca-Tulancingo, km. 4.5, Mineral de la Reforma, Pachuca 42184, Mexico., Reyes-Valderrama MI; Academic Area of Earth Sciences and Materials, Institute of Basic Sciences and Engineering, Autonomous University of the State of Hidalgo, Highway Pachuca-Tulancingo, km. 4.5, Mineral de la Reforma, Pachuca 42184, Mexico., Rodríguez-Lugo V; Academic Area of Earth Sciences and Materials, Institute of Basic Sciences and Engineering, Autonomous University of the State of Hidalgo, Highway Pachuca-Tulancingo, km. 4.5, Mineral de la Reforma, Pachuca 42184, Mexico., Toro N; Faculty of Engineering and Architecture, Universidad Arturo Prat, Iquique 1100000, Chile., Gálvez E; Departamento de Ingeniería Metalúrgica y Minas, Universidad Católica del Norte, Antofagasta 1270709, Chile., Acevedo-Sandoval OA; Academic Area of Chemistry, Institute of Basic Sciences and Engineering, Autonomous University of the State of Hidalgo, Highway Pachuca-Tulancingo, km. 4.5, Mineral de la Reforma, Pachuca 42184, Mexico., Hernández-Ávila J; Academic Area of Earth Sciences and Materials, Institute of Basic Sciences and Engineering, Autonomous University of the State of Hidalgo, Highway Pachuca-Tulancingo, km. 4.5, Mineral de la Reforma, Pachuca 42184, Mexico., Salinas-Rodríguez E; Academic Area of Earth Sciences and Materials, Institute of Basic Sciences and Engineering, Autonomous University of the State of Hidalgo, Highway Pachuca-Tulancingo, km. 4.5, Mineral de la Reforma, Pachuca 42184, Mexico. |
| Abstrakt: |
Environmental pollution today is a latent risk for humanity, here the need to recycle waste of all kinds. This work is related to the kinetic study of the leaching of gold and copper contained in waste electrical and electronic equipment (WEEE) and silver contained in mining wastes (MW), using the O 2 -thiosemicarbazide system. The results obtained show that this non-toxic leaching system is adequate for the leaching of said metals. Reaction orders were found ranging from 0 (Cu), 0.93 (Ag), and 2.01 (Au) for the effect of the reagent concentration and maximum recoveries of 77.7% (Cu), 95.8% (Au), and 60% (Ag) were obtained. Likewise, the activation energies found show that the leaching of WEEE is controlled by diffusion (Cu Ea = 9.06 and Au Ea = 18.25 kJ/Kmol), while the leaching of MW (Ea = 45.55 kJ/Kmol) is controlled by the chemical reaction. For the case of stirring rate, it was found a low effect and only particles from WEEE and MW must be suspended in solution to proceed with the leaching. The pH has effect only at values above 8, and finally, for the case of MW, the O 2 partial pressure has a market effect, going the Ag leaching from 33% at 0.2 atm up to 60% at a 1 atm. |
