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Kinetics of the solvent-mediated transformation of hydromagnesite into magnesite at different temperatures

Published online by Cambridge University Press:  05 July 2018

F. Di Lorenzo ,
R. M. Rodríguez-Galán  and
M. Prieto
F. Di Lorenzo*
Affiliation:
Department of Geology, University of Oviedo, Oviedo, Spain
R. M. Rodríguez-Galán
Affiliation:
Department of Geology, University of Oviedo, Oviedo, Spain
M. Prieto
Affiliation:
Department of Geology, University of Oviedo, Oviedo, Spain
*
* E-mail: fulvio@geol.uniovi.es
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Abstract

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The process of transforming hydromagnesite to magnesite is analysed in the context of the theory of solvent-mediated transformations. A series of experiments at 120, 150 and 180ºC with different heating times was designed to determine, by powder X-ray diffraction, the amount of magnesite generated as a function of time. The aqueous-phase composition was monitored by inductively coupled plasma-mass spectrometry and carbonate alkalimetry. From the analytical data, the evolution of saturation indexes with respect to both phases was determined using the geochemical code PHREEQC. Finally, two different methods were applied to obtain the activation energy of the process and a TTT (Temperature- Transformation-Time) graph was constructed to define suitable conditions in which to obtain magnesite.

Keywords

alkalimetryhydromagnesitemagnesitesolvent-mediated transformation
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 6 , November 2014 , pp. 1363 - 1372
Creative Commons
Creative Common License - CCCreative Common License - BY
© [2014] The Mineralogical Society of Great Britain and Ireland. This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY) licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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