Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 41: Issue 2-3
A thermoanalytical study of the oxidation of chalcocite
Authors: J. Dunn 1 , A. Ginting 1 , and B. O’Connor 2
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  • 1 Curtin University of Technology School of Applied Chemistry Perth Western Australia
  • | 2 Curtin Univeristy of Technology Department of Applied Physics Perth Western Australia
Pages:
671–686
Online Publication Date:
09 Jan 2007
Publication Date:
01 Feb 1994
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf02549341
Keywords:
electron probe microanalysis oxidation of chalcocite; FTIR; hot stage microscopy; SEM; TG-DTA; X-ray
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Abstract  

A sample of chalcocite of particle size 45–75 μm, has been oxidised in a TG-DTA apparatus at a heating rate of 10 deg·min−1 and the products at various temperatures characterised by XRD, SEM, FTIR and EPMA. This has enabled the events in the TG-DTA record to be assigned to specific chemical reactions, as well as the development of a full reaction scheme for the oxidation of chalcocite. Only minor reactions occurred up to 430°C, but above this temperature there was significant oxidation which resulted in an exotherm and mass gain. These events were due primarily to the oxidation of sulfide to copper(I) oxide, and the formation of copper(II) sulfate. The reaction then slowed, but melting commenced at 490°C which permitted further oxidation to take place with the appearance of a second exotherm and mass gain. By 570°C, sulfide oxidation was complete, but solid-solid reactions took place between Cu2O and CuSO4 to produce CuO·CuSO4. Some conversion of Cu2O had occurred. By 775°C, CuO and CuO·CuSO4 were the only phases detected. Above this temperature the latter phase was unstable and decomposed to the end product CuO.

Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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