Reducción de sulfatos mediante inyección de CO2 y su relación con los costos operativos actuales de la planta de tratamiento aguas ácidas ARD-250
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Date
2022
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Universidad Nacional de Trujillo
Abstract
En el presente trabajo de investigación, se estudió y definió la influencia del tiempo de inyección de CO2 sobre la disminución de pH en el efluente minero metalúrgico y a su vez la relación sobre los costos operativos proveniente de la planta ARD-250 (Acid Rock Drainage) de la Compañía Minera Barrick Misquichilca SAC - Unidad Pierina, teniendo su ubicación en la Provincia de Huaraz, Distrito de Jangas. Departamento de Ancash, aplicando un modelo unifactorial cuya variable de tiempo de inyección de CO2, se evaluó en tres niveles de tiempo de 30, 60, y 90 min; se realizaron 3 combinaciones con los valores de la variable estudiada y se repitió cada combinación 3 veces haciendo un total de 9 pruebas. Se determinó el volumen de muestra siendo 1m3 del efluente minero metalúrgico de la planta ARD-250 (Acid Rock Drainage), al cual se le inyectó CO2 en las condiciones y niveles de tiempo mencionadas en el desarrollo de la prueba; por otro lado, los resultados indican que el pH más adecuado a considerar es 8.29 en promedio el cual cumple con la legislación actual y la integración futura de los mismos, este se logró con un tiempo de inyección de CO2 de 30 minutos; además, es importante señalar que el análisis económico obtuvo los siguientes beneficios: ahorro en agua tratada $144,504/año, ahorro en ópex: $67,200/año y un aumento de la eficiencia en la eliminación de sulfatos de un 26.16%; por otro lado el análisis de resultados se puede concluir que; a medida que el tiempo de inyección de CO2 aumenta, entonces el pH disminuye en el efluente minero metalúrgico; finalmente, a un nivel de confianza del 95%, el análisis de varianza ratifica que la variable que afecta significativamente a la disminución del pH del efluente minero metalúrgico de estudio es el tiempo de inyección de CO2, quedando demostrada la factibilidad de la variable en el proceso de disminución del pH del efluente minero metalúrgico de la planta ARD-250 (Acid Rock Drainage).
In the present research work, the influence of the CO2 injection time on the decrease in pH in the metallurgical mining effluent and, in turn, the relationship on the operating costs from the ARD-250 plant (Acid Rock Drainage) was studied and defined. of the Barrick Misquichilca SAC Mining Company - Pierina Unit, having its location in the Province of Huaraz, District of Jangas. Department of Ancash, applying a unifactorial model whose CO2 injection time variable was evaluated at three-time levels of 30, 60, and 90 min; 3 combinations were made with the values of the variable studied and each combination was repeated 3 times, making a total of 9 tests. The sample volume was determined to be 1m3 of the metallurgical mining effluent from the ARD-250 (Acid Rock Drainage) plant, to which CO2 was injected under the conditions and time levels mentioned in the development of the test; on the other hand, the results indicate that the most appropriate pH to consider is 8.29 on average, which complies with current legislation and their future integration, this was achieved with a CO2 injection time of 30 minutes; In addition, it is important to point out that the economic analysis obtained the following benefits: savings in treated water $144,504/year, savings in opex: $67,200/year and an increase in efficiency in the removal of sulfates of 26.16%; On the other hand, the analysis of results can conclude that; as the CO2 injection time increases, then the pH decreases in the metallurgical mining effluent; finally, at a confidence level of 95%, the analysis of variance confirms that the variable that significantly affects the decrease in pH of the metallurgical mining effluent under study is the CO2 injection time, demonstrating the feasibility of the variable in the pH reduction process of the metallurgical mining effluent from the ARD-250 (Acid Rock Drainage) plant.
In the present research work, the influence of the CO2 injection time on the decrease in pH in the metallurgical mining effluent and, in turn, the relationship on the operating costs from the ARD-250 plant (Acid Rock Drainage) was studied and defined. of the Barrick Misquichilca SAC Mining Company - Pierina Unit, having its location in the Province of Huaraz, District of Jangas. Department of Ancash, applying a unifactorial model whose CO2 injection time variable was evaluated at three-time levels of 30, 60, and 90 min; 3 combinations were made with the values of the variable studied and each combination was repeated 3 times, making a total of 9 tests. The sample volume was determined to be 1m3 of the metallurgical mining effluent from the ARD-250 (Acid Rock Drainage) plant, to which CO2 was injected under the conditions and time levels mentioned in the development of the test; on the other hand, the results indicate that the most appropriate pH to consider is 8.29 on average, which complies with current legislation and their future integration, this was achieved with a CO2 injection time of 30 minutes; In addition, it is important to point out that the economic analysis obtained the following benefits: savings in treated water $144,504/year, savings in opex: $67,200/year and an increase in efficiency in the removal of sulfates of 26.16%; On the other hand, the analysis of results can conclude that; as the CO2 injection time increases, then the pH decreases in the metallurgical mining effluent; finally, at a confidence level of 95%, the analysis of variance confirms that the variable that significantly affects the decrease in pH of the metallurgical mining effluent under study is the CO2 injection time, demonstrating the feasibility of the variable in the pH reduction process of the metallurgical mining effluent from the ARD-250 (Acid Rock Drainage) plant.
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Keywords
Sulfatos, Dióxido de carbono, pH, Costos operativos