Journal
CRYSTAL RESEARCH AND TECHNOLOGY
Volume 50, Issue 4, Pages 277-283Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/crat.201400135
Keywords
vaterite; batch crystallization; growth rate
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Funding
- National High Technology Research and Development Program of China [2011AA06A107]
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Batch reactive crystallization of calcium carbonate (CaCO3) from ammonium carbonate ((NH4)(2)CO3) and calcium sulfate (CaSO4) was investigated in the presence of magnesium (Mg2+) ions. It was observed that Mg2+ ions partly inhibited the conversion of CaSO4 into CaCO3. When the content of Mg2+ was less than 2%, the reduction in conversion rate of CaSO4 was less than 2%, and the effect of Mg2+ ions could be ignored. Effect of impurity on crystallization kinetics of CaCO3, including the growth rate and nucleation rate, was investigated. The results revealed that when Mg2+ ions content was less than 1%, Mg2+ could promote the growth of CaCO3 and inhibit the nucleation process, which was favorable for the filtration of CaCO3.When the content of Mg2+ ions was greater than 1%, Mg2+ inhibited the growth of CaCO3, which resulted in explosion nucleation and led to a large number of particles in the solution, which was unfavorable for the filtration of CaCO3. Based on the Bransom model, the particle size distribution equations of CaCO3 were established. X-ray diffraction patterns and scanning electron microscopy images exhibited the existence of spherical vaterite of CaCO3 due to the reaction of CaSO4 with (NH4)(2)CO3 under the effect of Mg2+ ions, which was inconsistent with the results reported in the literatures.
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