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Comparison of semicontinuous and batch precipitation of calcium carbonate (CROSBI ID 541781)

Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija

Kralj, Damir ; Ukrainczyk, Marko ; Kontrec, Jasminka ; Brečević, Ljerka Comparison of semicontinuous and batch precipitation of calcium carbonate // 17th International Symposium on Industrial Crystallization / Ulrich, Joachim (ur.). Maastricht: European Federation of Chemical Engineers, 2008. str. 1059-1066

Podaci o odgovornosti

Kralj, Damir ; Ukrainczyk, Marko ; Kontrec, Jasminka ; Brečević, Ljerka

engleski

Comparison of semicontinuous and batch precipitation of calcium carbonate

A comparison of semicontinuous and batch precipitation of calcium carbonate is presented. In both processes, precipitated calcium carbonate (PCC) was synthesized by carbonation of slaked lime. The experiments in the batch process were performed by varying the initial mass concentration and temperature, and in the semicontinuous process by varying the supersaturation and temperature. It was found, that in the batch experiments the specific surface area and the average size of calcite particles decreased with increase of temperature. PCC nanoparticles can be produced at 25 °C, whereas the increase of the initial mass concentration of slaked lime enhances the degree of their aggregation. At higher temperatures (35 and 45 °C), scalenohedral micrometric calcite precipitates. By careful tuning of the semicontinuous process parameters, calcite in the form of rhombohedral, truncated prismatic, scalenohedral or nanosized particles can be produced. Specific surface area increases with increasing supersaturation and decreasing temperature. The excess of suspended Ca(OH)2 has a decisive role in the formation of the calcite nanoparticles.

Precipitated calcium carbonate; carbonation; batch and semicontinuous process; morphology

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Podaci o prilogu

1059-1066.

2008.

objavljeno

Podaci o matičnoj publikaciji

17th International Symposium on Industrial Crystallization

Ulrich, Joachim

Maastricht: European Federation of Chemical Engineers

Podaci o skupu

17th International Symposium on Industrial Crystallization

poster

14.09.2008-17.09.2008

Maastricht, Nizozemska

Povezanost rada

Kemija

Poveznice