期刊
APPLIED GEOCHEMISTRY
卷 24, 期 9, 页码 1635-1639出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.apgeochem.2009.04.030
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A high-pressure gas stage, recently developed for in-situ X-ray powder diffraction studies of polymer crystallization under CO(2), has been used to observe the carbonation of wollastonite under various temperature/pressure conditions despite the fact that the stage was not designed for use with moisture-containing samples. The rate of carbonation of wollastonite at 60 degrees C was found to be pressure-independent. Additional experiments at 34.5 bar between 43 and 73 degrees C enabled an activation energy of 53 kJ mol(-1) to be determined for the rate-limiting step. This value agrees very well with a published value for the leaching of Ca from wollastonite in acidic conditions and suggests that Ca leaching is the rate-limiting step in wollastonite carbonation at these temperatures. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
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