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Precipitated Calcium Carbonate Prepared by Batch and Semicontinuous Processes

Ukrainczyk, Marko; Kontrec, Jasminka; Babić Ivančić, Vesna; Brečević, Ljerka; Kralj, Damir (2005) Precipitated Calcium Carbonate Prepared by Batch and Semicontinuous Processes. Kemija u industriji, 54 (7-8). pp. 385-390. ISSN 0022-9830

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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.

Item Type: Article
Uncontrolled Keywords: Precipitated calcium carbonate; slaked lime; batch and semicontinuous carbonation proces
Subjects: NATURAL SCIENCES > Chemistry
Divisions: Division of Materials Chemistry
Project titleProject leaderProject codeProject type
Mehanizmi taloženja anorganskih biokompatibilnih i srodnih materijala[120470] Damir Kralj098-0982904-2951MZOS
Depositing User: Damir Kralj
Date Deposited: 22 Nov 2013 12:58

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