Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 82: Issue 1
Thermal decomposition of jarosites of potassium, sodium and lead
Authors:
R. L. Frost Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology GPO Box 2434, Brisbane Queensland 4001, Australia GPO Box 2434, Brisbane Queensland 4001, Australia

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M. L. Weier Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology GPO Box 2434, Brisbane Queensland 4001, Australia GPO Box 2434, Brisbane Queensland 4001, Australia

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W. Martens Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology GPO Box 2434, Brisbane Queensland 4001, Australia GPO Box 2434, Brisbane Queensland 4001, Australia

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Pages:
115–118
Online Publication Date:
11 Jan 2006
Publication Date:
01 Sep 2005
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-005-0850-z
Keywords:
dehydration; dehydroxylation; high-resolution thermogravimetry; Raman spectroscopy; jarosite
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Summary  

Jarosites are a group of minerals formed in evaporite deposits and form a component of efflorescence. As such the minerals can function as cation and heavy metal collectors. Thermogravimetry coupled to mass spectrometry has been used to study three Australian jarosites which are predominantly K, Na and Pb jarosites. Mass loss steps of K-jarosite occur over the 130 to 330 and 500 to 622C temperature range and are attributed to dehydroxylation and desulphation. In contrast the behaviour of the thermal decomposition of Na-jarosite shows three mass loss steps at 215 to 230, 316 to 352 and 555 to 595C. The first mass loss step for Na-jarosite is attributed to deprotonation. For Pb-jarosite two mass loss steps associated with dehydroxylation are observed at 390 and 418C and a third mass loss step at 531C is attributed to the loss of SO3. Thermal analysis is an excellent technique for the study of jarosites. The analysis depends heavily on the actual composition of the jarosite.

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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

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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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