Temat: exergy - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Exergy analysis of the coal gasification process in ex-situ conditions
Autorzy:: Janoszek, T.
Powiązania:: https://bibliotekanauki.pl/articles/91916.pdf
Data publikacji:: 2013
Wydawca:: Główny Instytut Górnictwa
Tematy:: coal gasification
exergy analysis
fossil fuel
zgazowanie węgla
analiza egzergii
paliwo konwekcyjne
Opis:: In this article the possibilities of implementing exergy analysis of coal gasification processes in ex-situ conditions was presented. The analysis was performed in order to detect the sources of exergy loss. The experimental results of the coal gasification process are also presented and was used as input data to perform the exergy analysis of the coal gasification process.
Źródło:: Journal of Sustainable Mining; 2013, 12, 3; 32-37
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: 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.
Powiązania:: https://bibliotekanauki.pl/articles/1839028.pdf
Data publikacji:: 2020
Wydawca:: Główny Instytut Górnictwa
Tematy:: exergy
exergetic cost
extractive gold process
open-pit mining
silver
gold
egzergia
koszt egzergetyczny
wydobycie złota
wydobycie odkrywkowe
srebro
złoto
Opis:: 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.
Źródło:: Journal of Sustainable Mining; 2020, 19, 3; 166-181
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Exergy life cycle assessment indicators in Colombian gold mining sector
Autorzy:: Cano, Natalia A.
Hasenstab, Christian
Velásquez, Héctor I.
Powiązania:: https://bibliotekanauki.pl/articles/1839025.pdf
Data publikacji:: 2020
Wydawca:: Główny Instytut Górnictwa
Tematy:: exergy analysis
life cycle assessment
mining process
gold extraction sustainability
analiza egzergii
ocena cyklu życia
proces wydobywczy
zrównoważony rozwój wydobycia złota
Opis:: Thermodynamic methods, such as exergy analysis allow the assessment of environmental load (environmental impacts), by calculating the entropy generated or exergy destroyed due to the use of renewable and non-renewable resources along the entire production chain. In this research, exergy analysis will be approached as an extension of LCA to ExLCA (Exergy Life Cycle Assessment), as complementary tools, for sustainability assessment of two gold mining systems in Colombia: open-pit and alluvial mining. It is quantified exergy life cycle efficiencies; Cumulative Energy/ Exergy Demand, by distinguishing between renewable and non-renewable resources used in the process. The energy contained in renewable and non-renewable resources, interpreted as a measure of its utility potential, and which inefficient use generates waste streams with an exergy content that may be a measure of its potential to cause environmental damage. For open-pit mining 53% of exergy consumed comes from fossil energy, and 26% of energetic use of water, while in alluvial mining, 94% of exergy flow comes from water as a resource used within process activities. In order to reduce the environmental impact associated with gold generation life cycle described in this study, four strategies should be implemented; 1) Increasing efficiency, by reducing the exergy required in tails and extraction stages in open-pit mining process and, casting and molding stage in alluvial mining process, where large exergy supplies are required. 2) Increasing efficiency through the reduction of exergy emissions and residues in casting and molding stage in alluvial mining, and stripping stage in open-pit mining. 3) Using external exergy resources, such as renewable resources from nature (solar, wind, hydraulic). 4) Applying the concept of circular economy, which implies the reduction in consumption of resources.
Źródło:: Journal of Sustainable Mining; 2020, 19, 3; 151-165
2300-1364
2300-3960
Pojawia się w:: Journal of Sustainable Mining
Dostawca treści:: Biblioteka Nauki

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