Obtaining calcium carbonate in a multiphase system by the use of new rotating disc precipitation reactor

Kędra-Królik, Karolina; Gierycz, Paweł

doi:10.1007/s10973-005-7416-y

Cited by 14 publications

(25 citation statements)

References 5 publications

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“…Although, in many cases, the precipitate is a mixture of two or three CaCO 3 polymorphs [33,34], the obtained polymorphic form of CaCO 3 fully agrees with our previous results [24,25].…”

Section: Crystalline Structuresupporting

confidence: 91%

“…In the present experiments, the carbonation process was carried out in multiphase system using the RDR [24,25], as shown in Fig. 1.…”

Section: Precipitation Proceduresmentioning

confidence: 99%

“…The main objective of this work is to characterize calcium carbonate aggregates of nanoparticles obtained in a controlled multiphase system by use of the reactor with rotating discs (RDR) [24,25]. The multiphase formation of CaCO 3 is important not only from the theoretical point of view, but also from that of fundamental applicative implications in the field of cultural heritage conservation.…”

Section: Introductionmentioning

confidence: 99%

“…30 nm [24,25], but the size of their aggregates depends strongly on the reaction conditions. Because aggregates of CaCO 3 nanoparticles covered by organic substances find nowadays wide industrial applications (pharmaceuticals, synthetic bone, semi-permeable membranes, etc.…”

Section: Introductionmentioning

confidence: 99%

“…[28][29][30]), the aim of the current study was to find solutions concerning possibilities in the production of ultrafine, well-defined (depending on the process conditions) calcite powder aggregates, in the rotating disc reactor without any additives. From our previous studies [24,25], we know that the nanostructured CaCO 3 powder is very pure, thermodynamically stable and has welldeveloped specific surface area [24]. In this study, we intended to check whether the aggregation process of nanoparticle can be controlled by mixing conditions in the rotating disc precipitation reactor and the initial calcium hydroxide suspension content.…”

Section: Introductionmentioning

confidence: 99%

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

Wszelaka‐Rylik

Piotrowska

Gierycz

2014

J Therm Anal Calorim

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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.

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“…Although, in many cases, the precipitate is a mixture of two or three CaCO 3 polymorphs [33,34], the obtained polymorphic form of CaCO 3 fully agrees with our previous results [24,25].…”

Section: Crystalline Structuresupporting

confidence: 91%

“…In the present experiments, the carbonation process was carried out in multiphase system using the RDR [24,25], as shown in Fig. 1.…”

Section: Precipitation Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%