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Thermal analysis of halotrichites

Frost, Ray L., Locke, Ashley J., & Martens, Wayde N. (2007) Thermal analysis of halotrichites. Thermochimica Acta, 459(1-2), pp. 64-72.

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Abstract

Four halotrichites from different origins were analysed by thermogravimetric and differential thermogravimetric analysis. The halotrichites were analysed by powder X-ray diffraction and were phase pure. The chemical composition was analysed using EDX techniques. The formula of the halotrichite minerals were determined as halotrichite (Fe0.752+,Mg0.25)SO4.Al2(SO4)3.22H2O,apjohnite (Mn0.642+,Mg0.28,Zn0.08)SO4.Al2(SO4)3.22H2O, pickeringite (Fe0.222+,Mg0.78)SO4.Al2(SO4)3.22H2O, wupatkiite as (Co0.45,Fe0.552+)SO4.Al2(SO4)3.22H2O. Three low temperature decomposition steps a) between 0 and 44°C, 50 and 76°C, 72 and 88°C were attributed to dehydration. An additional dehydration step at around 317 to 330°C was confirmed by in-situ mass spectrometry. The higher temperature decomposition steps between 516 and 738°C are attributed to the decomposition of sulphate to sulphur dioxide and oxygen as confirmed by mass spectrometry. A comparison of the thermal decomposition of jarosites is made.

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ID Code: 8361
Item Type: Journal Article
Keywords: evaporite, jarosite, halotrichite, sulphate, thermogravimetric analysis, Raman spectroscopy
DOI: 10.1016/j.tca.2007.04.015
ISSN: 0040-6031
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2007 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 02 Jul 2007
Last Modified: 29 Feb 2012 23:38

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