Growth of Nanosized Calcite through Gas−Solid Carbonation of Nanosized Portlandite under Anisobaric Conditions

The gas−solid carbonation of nanosized portlandite was experimentally investigated using a static bed reactor under anisobaric conditions. The effects of initial CO2 pressure (10−40 bar), reaction temperature (30 and 60 °C), and relative humidity were investigated. Three steps of the carbonation pro...

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Published in:Crystal growth & design 2010-11, Vol.10 (11), p.4823-4830
Main Authors: Montes-Hernandez, G, Daval, D, Chiriac, R, Renard, F
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Earth Sciences
Environmental Sciences
Exact sciences and technology
Geochemistry
Global Changes
Materials science
Methods of crystal growth
physics of crystal growth
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Precipitation
Sciences of the Universe
Theory and models of crystal growth
physics of crystal growth, crystal morphology and orientation
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cites cdi_FETCH-LOGICAL-a390t-d6f89b9dedcb94c64645f42078a8c74eb437f1e7eb6601b1fc0b6e228edc42c33
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creator Montes-Hernandez, G
Daval, D
Chiriac, R
Renard, F
description The gas−solid carbonation of nanosized portlandite was experimentally investigated using a static bed reactor under anisobaric conditions. The effects of initial CO2 pressure (10−40 bar), reaction temperature (30 and 60 °C), and relative humidity were investigated. Three steps of the carbonation process were determined: (1) instantaneous CO2 mineralization during CO2 injection period. From 25 to 40 wt % of initial portlandite grains were transformed into calcite during the CO2 injection period (from 0.9 to 2 min). (2) Fast CO2 mineralization after gas injection period (
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The effects of initial CO2 pressure (10−40 bar), reaction temperature (30 and 60 °C), and relative humidity were investigated. Three steps of the carbonation process were determined: (1) instantaneous CO2 mineralization during CO2 injection period. From 25 to 40 wt % of initial portlandite grains were transformed into calcite during the CO2 injection period (from 0.9 to 2 min). (2) Fast CO2 mineralization after gas injection period (&lt;5 h) followed by (3) a slow CO2 mineralization until an equilibrium state (&lt;24 h). The results revealed high efficiency from portlandite-to-calcite transformation (&gt;95%). For this case, the mineralization of CO2 does not form a protective carbonate layer around the reacting particles of portlandite as typically observed by other gas−solid carbonation methods. This method could be efficiently performed to produce nanosized calcite. Moreover, the separation of calcite particles from the fluid phase is most simple compared with precipitation methods. A kinetic pseudo-second-order model was satisfactorily used to describe the three CO2 mineralization steps except for the carbonation reaction initiated at 40 bar. 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source American Chemical Society:Jisc Collections:American Chemical Society Read & Publish Agreement 2022-2024 (Reading list)
subjects Cross-disciplinary physics: materials science
rheology
Earth Sciences
Environmental Sciences
Exact sciences and technology
Geochemistry
Global Changes
Materials science
Methods of crystal growth
physics of crystal growth
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Precipitation
Sciences of the Universe
Theory and models of crystal growth
physics of crystal growth, crystal morphology and orientation
title Growth of Nanosized Calcite through Gas−Solid Carbonation of Nanosized Portlandite under Anisobaric Conditions
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