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Influence of crystallization conditions on crystal morphology and size of CaCO 3 and their effect on pressure filtration
Author(s) -
Beck Ralf,
Andreassen JensPetter
Publication year - 2012
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.12566
Subject(s) - supersaturation , vaterite , calcium carbonate , calcite , crystallization , nucleation , particle size , particle size distribution , aragonite , materials science , particle (ecology) , filtration (mathematics) , crystal (programming language) , chemical engineering , coulter counter , mineralogy , grain size , analytical chemistry (journal) , crystallography , chemistry , composite material , chromatography , mathematics , microbiology and biotechnology , oceanography , computer science , biology , programming language , statistics , organic chemistry , geology , engineering
The temperature, supersaturation, seeding procedure, stirring speed and other parameters were varied in crystallization experiments of calcium carbonate performed in aqueous solutions to control size, particle size distribution and morphology of the particles. Particle size information was obtained by focused beam reflectance measurements and the Coulter Counter Multisizer. Crystals of CaCO 3 could be crystallized as spherical polycrystalline particles of the vaterite polymorph, needle‐like crystals of aragonite and both cube‐like and novel plate‐like crystals of calcite. Filtration experiments for calcium carbonate, performed at a constant pressure difference of 2 bar, show that spherical particles with a larger size show better filterability and that spheres with a wider size distribution, as a result of high supersaturation and nucleation, give higher average cake resistance values. Comparing different particle morphologies, plate‐like crystals and needle‐like crystals show worse filterability than spherical particles and cube‐like particles. © 2011 American Institute of Chemical Engineers AIChE J, 2012