NDLI: Simulation, aggregation and thermal analysis of nanostructured calcite obtained in a controlled multiphase process

Content Provider	Springer Nature Link
Author	Wszelaka Rylik, Małgorzata Piotrowska, Katarzyna Gierycz, Paweł
Copyright Year	2014
Abstract	In the present experiments, the carbonation process in multiphase system was carried out using the reactor with rotating discs. Calcite was produced by controlled fast precipitation through gaseous CO$_{2}$ adsorption in Ca(OH)$_{2}$ slurry. Furthermore, the reaction kinetics' were controlled by disc’s revolution speed in the range from 80 rpm through 120 to 160 rpm. Initial concentration of the slurry ranged between 54 and 110 mM L$^{−1}$. The aggregates of crystals precipitated in the aqueous solution were of sub-micrometric size. Dynamic light scattering method showed that mean aggregate diameter decreased with the higher mixing rate as long as the mixing condition was homogenous (up to 160 rpm). Thermogravimetric analysis revealed that the surface of calcite was polluted by unwanted, different compounds amount of which depends on the initial concentration of the slurry. Therefore, in order to obtain chemically pure calcite, CaCO$_{3}$ powder was heated up in the laboratory oven. In order to explain the mechanism of calcite particles’ aggregation, the simulation of the aggregates formation has been performed based on the new model taking into account kinetics of the multiphase reaction, crystal growth and their agglomeration. The obtained data on crystal morphology during the precipitation process have been compared with the model simulation results. The internally consistent model very well describes both the formation and the aggregation of the calcite nanoparticles, and the same can be used and recommended for accurate calculations of the particle and aggregates’ sizes as well as their distribution in the reactor.
Starting Page	1323
Ending Page	1338
Page Count	16
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	119
Issue Number	2
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-10-31
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nanostructured material Thermal analysis Computer simulation Gas–liquid precipitation Calcium compounds Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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