Journal :   Asian Journal of Research in Chemistry

Volume No. :   4

Issue No. :  12

Year :  2011

Pages :   1844-1850

ISSN Print :  0974-4169

ISSN Online :  0974-4150


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Thermal and Spectroscopic Feature of the Cu3AsS4 Enargite Oxidation Up To 800ºC. Implications in the Arsenic Evolution



Address:   V.L. Barone1, D. Gazzoli2, I.D Lick3, I.B. Schalamuk4 and I.L. Botto1*
1Cequinor (Conicet-La Plata), Facultad de Ciencias Exactas, Universidad Nacional de La Plat (Argentina)
2Dipartimento di Chimica, Universitá La Sapienza, Roma (Italia)
3Cindeca (Conicet-La Plata), Facultad de Ciencias Exactas, Universidad Nacional de La Plata (Argentina)
4Inremi (Cicpba), Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata (Argentina)
*Corresponding Author
DOI No:

ABSTRACT:
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.
KEYWORDS:
Enargite, oxidation, As-O-Cu interaction, arsenic evolution.
Cite:
V.L. Barone, D. Gazzoli, I.D Lick, I.B. Schalamuk, I.L. Botto. Thermal and Spectroscopic Feature of the Cu3AsS4 Enargite Oxidation Up To 800ºC. Implications in the Arsenic Evolution. Asian J. Research Chem. 4(12): Dec., 2011; Page 1844-1850.
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