Authors:
Veronika Vágvölgyi University of Pannonia Department of Analytical Chemistry 8201 Veszprém PO Box 158 Pannonia Hungary

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M. Hales School of Physical and Chemical Sciences, Queensland University of Technology 2 George Street Inorganic Materials Research Program GPO Box 2434 Brisbane, Queensland 4001 Australia

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W. Martens School of Physical and Chemical Sciences, Queensland University of Technology 2 George Street Inorganic Materials Research Program GPO Box 2434 Brisbane, Queensland 4001 Australia

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J. Kristóf University of Pannonia Department of Analytical Chemistry 8201 Veszprém PO Box 158 Pannonia Hungary

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Erzsébet Horváth University of Pannonia Department of Environmental Engineering and Chemical Technology 8201 Veszprém PO Box 158 Pannonia Hungary

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R. Frost School of Physical and Chemical Sciences, Queensland University of Technology 2 George Street Inorganic Materials Research Program GPO Box 2434 Brisbane, Queensland 4001 Australia

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Abstract  

The understanding of the thermal stability of zinc carbonates and the relative stability of hydrous carbonates including hydrozincite and hydromagnesite is extremely important to the sequestration process for the removal of atmospheric CO2. The hydration-carbonation or hydration-and-carbonation reaction path in the ZnO-CO2-H2O system at ambient temperature and atmospheric CO2 is of environmental significance from the standpoint of carbon balance and the removal of green house gases from the atmosphere. The dynamic thermal analysis of hydrozincite shows a 22.1% mass loss at 247°C. The controlled rate thermal analysis (CRTA) pattern of hydrozincite shows dehydration at 38°C, some dehydroxylation at 170°C and dehydroxylation and decarbonation in a long isothermal step at 190°C. The CRTA pattern of smithsonite shows a long isothermal decomposition with loss of CO2 at 226°C. CRTA technology offers better resolution and a more detailed interpretation of the decomposition processes of zinc carbonate minerals via approaching equilibrium conditions of decomposition through the elimination of the slow transfer of heat to the sample as a controlling parameter on the process of decomposition. The CRTA technology offers a mechanism for the study of the thermal decomposition and relative stability of minerals such as hydrozincite and smithsonite.

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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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