Formation process of calcium carbonate from highly supersaturated solution

Kawano, Jun; Shimobayashi, Norimasa; Kitamura, Masao; Shinoda, Keiji; Aikawa, Nobuyuki

doi:10.1016/s0022-0248(01)01866-8

Cited by 81 publications

(56 citation statements)

References 5 publications

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“…In the absence of additives and at room T, ACC initially precipitates and readily transforms into vaterite and/ or calcite [63][64][65][66][67]. The presence of metastable phases preceding the crystallization of calcite is favored by highsupersaturation conditions [65].…”

Section: Phase Evolutionmentioning

confidence: 99%

Phase and morphology evolution of calcium carbonate precipitated by carbonation of hydrated lime

et al. 2012

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Phase and morphology evolution of CaCO 3 precipitated during carbonation of lime pastes via the reaction Ca(OH) 2 ? CO 2 ? CaCO 3 ? H 2 O has been investigated under different conditions (pCO 2 & 10 -3.5 atm at 60 % RH and 93 % RH; pCO 2 = 1 atm at 93 % RH) using XRD, FTIR, TGA, and SEM. Simulations of the pore solution chemistry for different stages and conditions of carbonation were performed using the PHREEQC code to investigate the evolution of the chemistry of the system.

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Section: Phase Evolutionmentioning

confidence: 99%

Phase and morphology evolution of calcium carbonate precipitated by carbonation of hydrated lime

et al. 2012

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“…ACC is a transient polymorph that precipitates out of a supersaturated solution following Ostwald's step rule; if not stabilized by any element, ACC will crystallize rapidly and completely into one of the five more stable polymorphs within seconds. (5) The amorphous polymorph is characterized by distinctive 40 to 120 nm spherules, in contrast to the 1 to 10 mm crystals typical of the other polymorphs. (4) Solubility studies suggest dramatic differences between the calcium carbonate polymorphs.…”

Section: Introductionmentioning

confidence: 99%

Solubility and bioavailability of stabilized amorphous calcium carbonate

Meiron

Bar-David

Aflalo

et al. 2011

Journal of Bone and Mineral Research

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Since its role in the prevention of osteoporosis in humans was proven some 30 years ago, calcium bioavailability has been the subject of numerous scientific studies. Recent technology allowing the production of a stable amorphous calcium carbonate (ACC) now enables a bioavailability analysis of this unique form of calcium. This study thus compares the solubility and fractional absorption of ACC, ACC with chitosan (ACC-C), and crystalline calcium carbonate (CCC). Solubility was evaluated by dissolving these preparations in dilute phosphoric acid. The results demonstrated that both ACC and ACC-C are more soluble than CCC. Fractional absorption was evaluated by intrinsically labeling calcium carbonate preparations with 45 Ca, orally administrated to rats using gelatin capsules. Fractional absorption was determined by evaluating the percentage of the administrated radioactive dose per milliliter that was measured in the serum, calcium absorption in the femur, and whole-body retention over a 34-hour period. Calcium serum analysis revealed that calcium absorption from ACC and ACC-C preparations was up to 40% higher than from CCC, whereas retention of ACC and ACC-C was up to 26.5% higher than CCC. Absorbed calcium in the femurs of ACC-administrated rats was 30% higher than in CCC-treated animals, whereas 15% more calcium was absorbed following ACC-C treatment than following CCC treatment. This study demonstrates the enhanced solubility and bioavailability of ACC over CCC. The use of stable ACC as a highly bioavailable dietary source for calcium is proposed based on the findings of this study. ß

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“…This is also shown by the growth of the Raman peak at 1083 cm -1 of 16 O-calcite over time ( Figure 3) and can be explained by the transformation of the initial metastable carbonates into more stable phases over time. [64][65][66][67][68][69][70][71][72][73][74][75][76][77] Figure 3 shows the disappearance over time of a peak at 495cm -1 that can be related to metastable hydrated phases 55 . Earlier, Rodriguez-Blanco et al 70 described the transformation mechanism of ACC to calcite as a two stage process: 1) ACC particles rapidly dehydrate and crystallize forming individual particles of vaterite; 2) the vaterite dissolves and re-precipitates as calcite (Ogino et al 71 also confirmed the latter stage also for aragonite O ratio within the first 24h.…”

Section: -33mentioning

confidence: 99%

Carbonation of Hydrous Materials at the Molecular Level: A Time of Flight-Secondary Ion Mass Spectrometry, Raman and Density Functional Theory Study

Pesce

Fletcher

Grant

et al. 2017

Crystal Growth & Design

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Carbonation of hydrous minerals such as calcium hydroxide (Ca(OH)2), is an important process in environmental and industrial applications for the construction industry, geological disposal repositories for nuclear waste, and green technologies for carbon capture. Although the role of ions during the carbonation mechanism of Ca(OH)2 is still unclear, we identified the exchange of ions during the dissolution-and-precipitation process, by determining the change in isotopic composition of carbonation products using

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Formation process of calcium carbonate from highly supersaturated solution

Cited by 81 publications

References 5 publications

Phase and morphology evolution of calcium carbonate precipitated by carbonation of hydrated lime

Phase and morphology evolution of calcium carbonate precipitated by carbonation of hydrated lime

Solubility and bioavailability of stabilized amorphous calcium carbonate

Carbonation of Hydrous Materials at the Molecular Level: A Time of Flight-Secondary Ion Mass Spectrometry, Raman and Density Functional Theory Study

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