Reaction mechanism and kinetics of enargite oxidation at roasting temperatures

Rafael Padilla, Alvaro Aracena, Maria C. Ruiz

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

21 Citas (Scopus)

Resumen

Roasting of enargite (Cu3AsS4) in the temperature range of 648 K to 898 K (375 °C to 625 °C) in atmospheres containing variable amounts of oxygen has been studied by thermogravimetric methods. From the experimental results of weight loss/gain data and X-ray diffraction (XRD) analysis of partially reacted samples, the reaction mechanism of the enargite oxidation was determined, which occurred in three sequential stages: First stage: 4Cu3AsS4(s) + 13O2(g) = As4O 6(g) + 6Cu2S(s) + 10SO29g) Second stage: 6Cu2S(s) + 9O2(g) = 6Cu2O(s) + 6SO 2(g) Third stage: 6Cu2O(s) + 3O2(g) = 12CuO(s) The three reactions occurred sequentially, each with constant rate, and they were affected significantly by temperature and partial pressure of oxygen. The kinetics of the first stage were analyzed by using the model X = k1t. The first stage reaction was on the order of 0.9 with respect to oxygen partial pressure and the activation energy was 44 kJ/mol for the temperature range of 648 K to 898 K (375 °C to 625 °C).

Idioma originalInglés
Páginas (desde-hasta)1119-1126
Número de páginas8
PublicaciónMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volumen43
N.º5
DOI
EstadoPublicada - oct. 2012
Publicado de forma externa

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