Affordable Access

Publisher Website

In situlaboratory X-ray powder diffraction study of wollastonite carbonation using a high-pressure stage

Authors
Journal
Applied Geochemistry
0883-2927
Publisher
Elsevier
Publication Date
Volume
24
Issue
9
Identifiers
DOI: 10.1016/j.apgeochem.2009.04.030
Disciplines
  • Design

Abstract

Abstract 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 °C was found to be pressure-independent. Additional experiments at 34.5 bar between 43 and 73 °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.

There are no comments yet on this publication. Be the first to share your thoughts.