Polymorphism of CaCO 3 , precipitated in a constant‐composition environment
Abstract
Polymorphism of calcium carbonate was investigated using a constant‐composition method, and three polymorphs—calcite, aragonite, and vaterite—are produced. Factors that affect the formation of polymorphs are studied over a wide range, including solution pH, temperature, concentration ratio of components, supersaturation, ionic strength, and type and concentration of additives. At room temperature, solution pH is the most significant factor, and high yield polymorphs are present at different pH values. At a high temperature, aragonite becomes the major product at a pH below 12. The effects of the additive are complicated, depending on its type and concentration as well as the operating conditions. The influence of concentration ratio and supersaturation on the formation of polymorphs is less significant, Besides, various particle morphologies of CaCO 3 polymorphs are observed, depending on the operating conditions.
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Experiments by Tai and Chen (1998) demonstrate that the favored Ca-carbonate polymorph is a function of solution pH; at 24°C, pH below 10-10.5 favors vaterite, pH ≥12-11.8 favors calcite, and pH 10.5-11.5 favors aragonite peaking at pH ~11.3.
“Experiments by Tai and Chen (1998) demonstrate that the favored Ca-carbonate polymorph is a function of solution pH. They found at 24˚C that with pH below 10 -10.5, vaterite is the favored polymorph to crystallize, while at pH ≥ 12 -11.8 calcite is dominant, and for pH in the range of 10.511.5 aragonite was the dominant polymorph peaking in abundance at pH ~11.3.”
From Isotopic fractionation accompanying CO2 hydroxylation and carbonate precipitation from high pH waters at The Cedars, California, USA (2021) · cites this paper as Tai and Chen (1998)
At pH ≥11.5, calcite nucleation/growth rates become greater than aragonite.
“As the aragonite layer thickens down into the water below with pH ≥11.5 calcite nucleation/growth rates become greater than aragonite (Tai and Chen 1998)”
From Isotopic fractionation accompanying CO2 hydroxylation and carbonate precipitation from high pH waters at The Cedars, California, USA (2021) · cites this paper as Tai and Chen 1998
At ~pH=11, aragonite nucleation/growth rates are greater than those of calcite.
“Within the water surface layer (not shown to scale) aragonite nucleation/growth rates are greater than those of calcite, consistent with ~pH=11 (Tai and Chen 1998).”
From Isotopic fractionation accompanying CO2 hydroxylation and carbonate precipitation from high pH waters at The Cedars, California, USA (2021) · cites this paper as Tai and Chen 1998
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- Authors
- Tai, C. Y., & Chen, F. ‐.
- Affiliations
- National Taiwan University (TW)
- ORCID
- Chen, F.‐B.
- Venue
- AIChE Journal
- Publisher
- Wiley
- Published
- 1998-08
- Volume
- 44
- Issue
- 8
- Pages
- 1790-1798
- ISSN
- 0001-1541 (ISSN-L)
- 1547-5905
- OpenAlex
- W1969818179
- Cited by
- 378
- References
- 0
- Citations by year
- 2026: 15 · 2025: 28 · 2024: 20 · 2023: 22 · 2022: 33 · 2021: 18 · 2020: 24 · 2019: 21 · 2018: 18 · 2017: 13 · 2016: 18 · 2015: 16 · 2014: 12 · 2013: 17 · 2012: 17
- FWCI
- 1.41
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- AIChE Journal (publishedVersion)
- Funders
- National Science Council
- Topics
- Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
- Physical Sciences › Materials Science › Materials Chemistry › Crystallization and Solubility Studies
- Physical Sciences › Environmental Science › Environmental Engineering › CO2 Sequestration and Geologic Interactions
- Keywords
- calcium carbonate polymorphism, calcite, aragonite, vaterite, solution pH, temperature effects, supersaturation, ionic strength, additive effects, particle morphology, precipitation kinetics
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