https://doi.org/10.15255/KUI.2006.014
Published: Kem. Ind. 56 (7-8) (2007) 385–390
Paper reference number: KUI-14/2006
Paper type: Original scientific paper
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Precipitated Calcium Carbonate Prepared by Batch and Semicontinuous Processes

M. Ukrainczyk, J. Kontrec, V. Babić-Ivančić, L. Brečević and D. Kralj

Abstract

A comparison of the physical-chemical properties of precipitated calcium carbonate (PCC), prepared by batch and semicontinuous processes, is presented. In both processes, PCC, was synthesized by carbonation of slaked lime. In the batch process the experiments were performed by varying the initial mass concentration and temperature, and the semicontinuous process was conducted by varying the initial supersaturation and temperature. Calcite was the only calcium carbonate polymorph that appeared under the experimental conditions investigated. It was found, that in the batch experiments the specific surface area and the average size of calcite particles decreased with the increase of temperature. At the same time, the increase of the initial mass concentration of slaked lime enhanced the degree of precipitate aggregation. PCC prepared by the semicontinuous process, conducted at low temperatures and high supersaturations, was of high specific surface area. By careful tuning of the semicontinuous process parameters, calcite in the form of rhombohedral, scalenohedral or nanosized spherical particles can be produced.

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Keywords

precipitated calcium carbonate, slaked lime, batch and semicontinuous carbonation process