CENTRO DE QUIMICA INORGANICA "DR. PEDRO J. AYMONINO"
Unidad Ejecutora - UE
Thermal and Spectroscopic Feature of the Cu3AsS4 Enargite Oxidation Up To 800ºC. Implications in the Arsenic Evolution
BARONE V,; GAZZOLI D; I LICK; I SCHALAMUK; I L BOTTO
Asian J Reseach Chemistry
Año: 2011 vol. 4 p. 1844 - 1844
The thermal oxidation of enargite (Cu3AsS4) from Chuquicamata (Chile) has been studied between RT and 800ºC. Enargite samples were heated in air atmosphere and analyzed by means of several physicochemical techniques such as XRPD, SEM-EDS, FTIR, XPS and chemical analysis. A surface digenite formation was observed in a first step. The XPS technique was particularly useful to correlate the copper oxidation with the As-O-Cu interaction, responsible for the continuous and slow As evolution up to temperatures higher than 600ºC. These results must be considered of interest to reduce the negative environmental impact of the technological copper production from valuable Cu-ores where enargite is present.