Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 56: Issue 1
Investigation on Thermal Decomposition of Pyrite Part I
Authors:
Y. Pelovski University of Chemical Technology and Metallurgy-Sofia 8 'Kl. Ohridski' blvd. 1756 Sofia 8 'Kl. Ohridski' blvd. 1756 Sofia

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V. Petkova Bulgarian Academy of Sciences Central Laboratory of Physico-Chemical Mechanics, Acad G. Bonchev Str., Bl. 1 1113 Sofia Bulgaria G. Bonchev Str., Bl. 1 1113 Sofia Bulgaria

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Pages:
95–99
Online Publication Date:
03 Nov 2004
Publication Date:
01 Jul 1999
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010135425009
Keywords:
chemical transformations; phase structures; pyrite; thermal decomposition; thermal stability
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Abstract  

Thermochemical decomposition of pyrite in air-gas medium has been studied by means of MOM-Q 1500D Derivatograph. The derivatograms have been obtained at a heating rate of 5 K min-1 and air flowrate of 25 1 h-1 to final temperatures of 833, 933 and 1273 K, chosen on the basis of the stepwise oxidation of pyrite. The solid product is analyzed using X-ray powder diffraction and Mssbauer spectrometer techniques. The formation of nonstoichiometric sulfides (pyrrhotines) as intermediates has been confirmed. The second stage of decomposition is the oxidation of these pyrrhotines to hematite. The recorded weight losses are lower than the theoretically possible because of the formed nonstoichiometric iron sulfides. The complicated structure of the intermediate products has been confirmed by means of other techniques.

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

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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