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Publicação
Exergy cost of mineral resources
Autores
Orientador(es)
Resumo(s)
Mineral deposits are considered as natural capital whose value can
be assessed in exergy terms. Historical industry experience provides evidence
that exploitation of mineral deposits and the beneficiation of ores are
essentially energy intensive. The persisting decline of the grade of the
developed deposits demands increasing exergy replacement and processing
costs. The results demonstrate how far processed ores and concentrates are
from ideal behaviour, and technologies from reversibility conditions.
The exploitation of mineral resources of declining quality for mineral
commodities imply a long time trend of increasing mass and exergy inputs
spent per unit product output, in line with a law of ‘diminishing returns’ on
invested exergy.
Descrição
Palavras-chave
Exergy entropy Entropy Mineral resources Ore grade Recovery ratio Concentration
Contexto Educativo
Citação
Rosa, Rui Namorado; Rosa, Diogo R. N. Exergy cost of mineral resources. In: International Journal of Exergy, Vol. 5, nºs 5-6, 2008, p.535-555.