LrgpV1, Main, Exploration, bibRecord, 000226

Agglomeration mechanisms and kinetics during the carbonation of a suspension of lime in a pilot batch reactor

Identifieur interne : 000226 ( Main/Exploration ); précédent : 000225; suivant : 000227

Agglomeration mechanisms and kinetics during the carbonation of a suspension of lime in a pilot batch reactor

Auteurs : Mathilde Schnebelen [France] ; Kevin Mozet [France] ; Alexandra Jakob [France] ; Didier Sy [France] ; Edouard Plasari [France] ; Hervé Muhr [France]

Source :

Crystal structure theory and applications [ 2169-2491 ] ; 2015.

RBID : Hal:hal-01327418

English descriptors

mix :
- Agglomeration Kernel, Lime Carbonation, Precipitation, Calcium Carbonate.

Abstract

The reaction studiedin this work is the synthesis of nanometric size calcium carbonate particles by carbonation of a suspension of lime, which represents the most common industrial route. It consists in bubbling carbon dioxide in a suspension of lime to obtain precipitated calcium carbo-nate (PCC). PCC is a mineral filler with various applications: sealants, paints, paper, ink, pharmacy, cosmetics, food etc. However, there is a challenge related to the synthesis and the use of this pre-cipitate: the agglomeration of the monoparticles. The aim of this work is then to understand the mechanisms of this phenomenon and to study its kinetics to improve the run of the process and the control of its impact on the final product. Experiments realized with a high concentration in sodium chloride (2 M) showed that the modification of the electrostatic environment did not change the particle size distribution and the morphology of the agglomerates. This indicates that the electrostatic interactions are not responsible for the agglomeration but the formation of crystalline bridges induced by the crystal growth. Thus, thanks to an agglomeration model including the crystal growth rate, the agglomeration kernelβand the agglomeration constantβ0can be determined using a mathematical treatment of the experimental particle size distributions. Finally, by varying the experimental conditions, it appears that the agglomeration constant increases with the temperature whereas there is an optimal value regarding the shear rate

Url:

https://hal.archives-ouvertes.fr/hal-01327418

DOI: 10.4236/csta.2015.43005

Affiliations:

Links toward previous steps (curation, corpus...)

to stream Hal, to step Corpus: 000082
to stream Hal, to step Curation: 000082
to stream Hal, to step Checkpoint: 000236
to stream Main, to step Merge: 000223
to stream Main, to step Curation: 000226

Le document en format XML

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<idno type="IdUnivLorraine">[UL]100--</idno>
<orgName>Université de Lorraine</orgName>
<orgName type="acronym">UL</orgName>
<date type="start">2012-01-01</date>
<desc><address><addrLine>34 cours Léopold - CS 25233 - 54052 Nancy cedex</addrLine>
<country key="FR"></country>
</address>
<ref type="url">http://www.univ-lorraine.fr/</ref>
</desc>
</org>
</tutelle>
<tutelle name="UMR7274" active="#struct-441569" type="direct"><org type="institution" xml:id="struct-441569" status="VALID"><idno type="ISNI">0000000122597504</idno>
<idno type="IdRef">02636817X</idno>
<orgName>Centre National de la Recherche Scientifique</orgName>
<orgName type="acronym">CNRS</orgName>
<date type="start">1939-10-19</date>
<desc><address><country key="FR"></country>
</address>
<ref type="url">http://www.cnrs.fr/</ref>
</desc>
</org>
</tutelle>
</tutelles>
</hal:affiliation>
<country>France</country>
<placeName><settlement type="city">Nancy</settlement>
<settlement type="city">Metz</settlement>
<region type="region" nuts="2">Grand Est</region>
<region type="old region" nuts="2">Lorraine (région)</region>
</placeName>
<orgName type="university">Université de Lorraine</orgName>
</affiliation>
</author>
</analytic>
<idno type="DOI">10.4236/csta.2015.43005</idno>
<series><title level="j">Crystal structure theory and applications</title>
<idno type="ISSN">2169-2491</idno>
<imprint><date type="datePub">2015</date>
</imprint>
</series>
</biblStruct>
</sourceDesc>
</fileDesc>
<profileDesc><textClass><keywords scheme="mix" xml:lang="en"><term> Agglomeration Kernel</term>
<term> Lime Carbonation</term>
<term> Precipitation</term>
<term>Calcium Carbonate</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">The reaction studiedin this work is the synthesis of nanometric size calcium carbonate particles by carbonation of a suspension of lime, which represents the most common industrial route. It consists in bubbling carbon dioxide in a suspension of lime to obtain precipitated calcium carbo-nate (PCC). PCC is a mineral filler with various applications: sealants, paints, paper, ink, pharmacy, cosmetics, food etc. However, there is a challenge related to the synthesis and the use of this pre-cipitate: the agglomeration of the monoparticles. The aim of this work is then to understand the mechanisms of this phenomenon and to study its kinetics to improve the run of the process and the control of its impact on the final product. Experiments realized with a high concentration in sodium chloride (2 M) showed that the modification of the electrostatic environment did not change the particle size distribution and the morphology of the agglomerates. This indicates that the electrostatic interactions are not responsible for the agglomeration but the formation of crystalline bridges induced by the crystal growth. Thus, thanks to an agglomeration model including the crystal growth rate, the agglomeration kernelβand the agglomeration constantβ0can be determined using a mathematical treatment of the experimental particle size distributions. Finally, by varying the experimental conditions, it appears that the agglomeration constant increases with the temperature whereas there is an optimal value regarding the shear rate</div>
</front>
</TEI>
<affiliations><list><country><li>France</li>
</country>
<region><li>Grand Est</li>
<li>Lorraine (région)</li>
</region>
<settlement><li>Metz</li>
<li>Nancy</li>
</settlement>
<orgName><li>Université de Lorraine</li>
</orgName>
</list>
<tree><country name="France"><region name="Grand Est"><name sortKey="Schnebelen, Mathilde" sort="Schnebelen, Mathilde" uniqKey="Schnebelen M" first="Mathilde" last="Schnebelen">Mathilde Schnebelen</name>
</region>
<name sortKey="Jakob, Alexandra" sort="Jakob, Alexandra" uniqKey="Jakob A" first="Alexandra" last="Jakob">Alexandra Jakob</name>
<name sortKey="Mozet, Kevin" sort="Mozet, Kevin" uniqKey="Mozet K" first="Kevin" last="Mozet">Kevin Mozet</name>
<name sortKey="Muhr, Herve" sort="Muhr, Herve" uniqKey="Muhr H" first="Hervé" last="Muhr">Hervé Muhr</name>
<name sortKey="Plasari, Edouard" sort="Plasari, Edouard" uniqKey="Plasari E" first="Edouard" last="Plasari">Edouard Plasari</name>
<name sortKey="Sy, Didier" sort="Sy, Didier" uniqKey="Sy D" first="Didier" last="Sy">Didier Sy</name>
</country>
</tree>
</affiliations>
</record>

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Agglomeration mechanisms and kinetics during the carbonation of a suspension of lime in a pilot batch reactor

Agglomeration mechanisms and kinetics during the carbonation of a suspension of lime in a pilot batch reactor

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