Authors:
J. G. Dunn Department of Chemistry Western Australian Institute of Technology Perth Western Australia

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C. E. Kelly Department of Chemistry Western Australian Institute of Technology Perth Western Australia

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The oxidative behaviour of natural pentlandite (FeNi)9S8 has been studied by thermogravimetry (TG) and differential thermal analysis (DTA) in a dynamic oxygen atmosphere (0.21 min−1) over the temperature range 20–1000°. Gaseous products were analysed by a coupled quadrupole mass spectrometer. The reaction products at various intermediate temperatures were characterised by X-ray diffractometry and chemical analysis. A reaction sequence has been deduced, in which in the temperature range 460–700° pentlandite breaks down with the formation of Fe2O3, NiSO4, NiO, NiS and NiFe2O4; FeSO4 was also formed but decomposed above 640°. Beyond 700° NiS was completely oxidised, and NiSO4 decomposed slowly. Another sulphide phase, possibly Ni3±xS2, was formed at 740° and completely oxidised at 790°, and above 800° NiSO4 decomposed completely leaving only Fe2O3, NiO and NiFe2O4 as stable products.

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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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