Evaluation of the extractive gold process: open-pit mining through exergy analysis

• Autorzy: Velasquez Hector I. , Orozco Loaiza Carlos Andres , Hasenstab Christian , Cano Natalia A.

Identyfikatory

DOI

10.46873/2300-3960.1014

• Języki publikacji: EN

Abstrakty

EN

The Colombian mining sector is characterized by the production of coal, nickel, emeralds, gold, and construction materials. It is considered by the National Development Plan of Colombia 2018-2022 as an economic agent that boosts development in the region and one that requires the strengthening of its policies and environmental liability. Therefore, this paper aims to show the importance of implementing methodologies based on the logic of nature (exergy) that objectively indicate the environmental impact of an extractive gold activity, such as open-pit gold mining. The extractive activity or process to be studied consists of the following stages: topsoil removal by using machinery and explosives to create craters and to access the mineral present in the subsoil; the physical transformation of the extracted material through crushing, grinding, gravimetric separation, flotation, leaching, adsorption, elution, and electrodeposition, along with smelting and casting to obtain gold and silver ingots. Thus, this paper analyzes the exergy performance of each unit process of the open-pit extractive process. The obtained results are used in a sensitivity analysis, which determines the system efficiency, by assuming the increase of gold in the extracted material in the exploitation stage, by using the same supplies and input of the current process. In other cases, the open-pit mining process is analyzed by changing its technologies in the mining process and assuming that this change reduces the inlet ore to 60%, by discarding 40% of material without gold and by reducing supply consumption by 25%. By improving the system efficiency, the exergy destroyed is reduced and the emissions to the environment diminish. Therefore, this method may be implemented as a basic guideline when it comes to decision-making processes in the planning of the extractive processes by integrating the environmental component with gold production.

Słowa kluczowe

EN

exergy; exergetic cost; extractive gold process; open-pit mining; silver; gold

PL

egzergia; koszt egzergetyczny; wydobycie złota; wydobycie odkrywkowe; srebro; złoto

• Wydawca: Elsevier ; Główny Instytut Górnictwa
• Czasopismo: Journal of Sustainable Mining
• Rocznik: 2020
• Tom: Vol. 19, iss. 3
• Strony: 166--181
• Opis fizyczny: Bibliogr. 21 poz.

Twórcy

autor

Velasquez Hector I.

• Universidad Nacional de Colombia Sede Medellín, Medellín, 050041, Colombia

autor

Orozco Loaiza Carlos Andres

• Universidad Nacional de Colombia Sede Medellín, Medellín, 050041, Colombia

autor

Hasenstab Christian

• Universidad Nacional de Colombia Sede Medellín, Medellín, 050041, Colombia

autor

Cano Natalia A.

• Universidad Nacional de Colombia Sede Medellín, Medellín, 050041, Colombia

Bibliografia

• [1] Bithas Kostas, Kalimeris Panos. A Brief History of Energy Use in Human Societies. Cham: In Springer; 2016. p. 5-10.
• [2] Moran MJ, Shapiro HN. Fundamentals of Engineering Thermodynamics. 6th ed. Limited John Wiley & Sons Canada; 2009.
• [3] Sartor K, Dewallef P. Exergy Analysis Applied to Performance of Buildings in Europe. Energy and Buildings 2017; 148:348-54.
• [4] Szargut J, Morris DR, Steward FR. Exergy Analysis of Thermal, Chemical, and Metallurgical Processes. Hemisphere Publishing Corporation; 1988.
• [5] Bakshi Bhavik R. A Thermodynamic Framework for Ecologically Conscious Process Systems Engineering. Computers & Chemical Engineering 2000;24(2):445-51. http://www.sciencedirect.com/science/article/pii/S0098135400004622.
• [6] Angelakoglou K, Gaidajis G. A Review of Methods Contributing to the Assessment of the Environmental Sustainability of Industrial Systems. Journal of Cleaner Production 2015;108(PA):725-47.
• [7] Liu Gengyuan, Brown Mark, Casazza Marco. Enhancing the Sustainability Narrative through a Deeper Understanding of Sustainable Development Indicators. Sustainability 2017;9(6): 1078. http://www.mdpi.com/2071-1050/9/6/1078. [Accessed 25 February 2020].
• [8] Sala Serenella, Ciuffo Biagio, Peter Nijkamp. A Systemic Framework for Sustainability Assessment. Ecological Economics 2015;119:314-25. http://www.sciencedirect.com/science/article/pii/S0921800915003821.
• [9] Arbault Damien, et al. Emergy Evaluation Using the Calculation Software SCALE: Case Study, Added Value and Potential Improvements. Science of The Total Environment 2014;472:608-19. http://www.sciencedirect.com/science/article/pii/S0048969713013703.
• [10] Cano N. Sustainability Assessment of Alluvial and Open Pit Mining Systems in Colombia: Life Cycle Assessment, Exergy Analysis, and Emergy Accounting. Universidad Nacional de Colombia; 2018.
• [11] Lopera Sergio. Extraction Pétrolière et Politique Énergétiquedurable: Le Cas Colombien. ” Universidad Pierre Mendés-France; 2004.
• [12] Valero Alicia, Valero Antonio, Martínez Amaya. Exergy Evaluation of the Mineral Capital on Earth: Influence of the Reference Environment.” In , 235-242. 2008.
• [13] Casallas Miguel, Martínez José Alejandro. Panorama de La Minería Del Oro En Colombia. Osinergmin 2015;20e27.
• [14] de México Gobierno. “Explotación Minera.” : 3-5. 2017. https://www.sgm.gob.mx/Web/MuseoVirtual/Aplicaciones_geologicas/Explotacion-minera.html. [Accessed 14 March 2019].
• [15] Lopez Aburto Victor. Manual Para La Selección de Métodos de Explotación de Minas. 1994. p. 126.
• [16] Cano Londoño, Natalia A, Velásquez HI, McIntyre N. Comparing the environmental sustainability of two gold production methods using integrated Emergy and Life Cycle Assessment. Ecological Indicators 2019;107:105600. https://doi.org/10.1016/j.ecolind.2019.105600.
• [17] Brodianski V. “Earth's Available Energy and the Sustainable Development of Life Support Systems. 2019.
• [18] Villada Zapata, Pablo Juan, Restrepo, Julán Jorge, Agustín Cardona-Molina, Martens Uwe. Geoquímica Y Geocronología De Las Rocas Volcánicas Básicas Y El Gabro De Altamira , Cordillera Occidental ( Colombia ): Registro De Ambientes De Plateau Y Arco Oceánico Superpuestos Gabroic Rocks in the Altamira Region. Western Cordillera of Colombia : A. 2017;39.
• [19] Arredondo Héctor Velasquez. Avaliação Exergética - Exergo-Ambiental Da Produção de Biocombustíveis. Dout (São Paulo: Escola Politécnica da Universidade de São Paulo. Departamento de Engenharia Mecânica.Tese; 2009. p. 212.
• [20] de Oliveira Silvio. Exergy Production, Cost and Renewability. Sao Paulo: Springer; 2013. http://www.springer.com/series/8059.
• [21] Kotas TJ. The Exergy Method of Thermal Plant Analysis. Malabar, Florida: Krieger Pu; 1995.