Naslov
Morphological kinetics in calcium carbonate precipitation

Autori
Vučak, Marijan ; Pons, Marie Noelle ; Vivier, Herve ; Chanel, Silvie ; Perić, Jelena ; Lenda, Henri

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Technologies Critical to a Changing World / - San Diego (CA) : The American Institute of Chemical Engineers, 1996, 704-709

Skup
The 5th World Congress of Chemical Engineering

Mjesto i datum
San Diego (CA), Sjedinjene Američke Države, 14.07.1996. - 18.07.1996

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
precipitated calcium carbonate; phase transformation; image analysis

Sažetak
Precipitated calcium carbonate (PCC) is receiving a large attention in industry as a specialty product. Different process conditions are used, producing crystals of different shapes. The monitoring of crystal population kinetics is usually made by laser diffraction, but the size distributions are obtained in volume and are not easy to interpret due to difficulties in the calculation of correct shape factors. Morphology can be investigated by particle imageing. It was therefore decided to use image analysis to characterize quantitatively the shapes observed during the precipitation of ultrapure calcium carbonate in a water solution of calcium nitrate and monoethanolamine (MEA) in a well-stirred contactor with and without an additive (sucrose). Crystals were observed by SEM, and digital images were directly captured and analyzed. Crystals were also examined by laser diffraction, IR-spectroscopy, and XRD. Sample specific surfaces were obtained by BET method. Based on these results crystal phase transformations and morphological kinetics during precipitation are discussed.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo

POVEZANOST RADA