Morphosynthesis of CaCO3 at different reaction temperatures and the effects of PDDA, CTAB, and EDTA on the particle morphology and polymorph stability

Altay, Esra; Shahwan, Talal; Tanoğlu, Metin

doi:10.1016/j.powtec.2007.05.004

Cited by 69 publications

(40 citation statements)

References 20 publications

(31 reference statements)

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“…By mixing calcium chloride and sodium carbonate salt in the solutions at ≥40 o C, the first phase of ACC results was deposited in the coupons within a few minutes and subsequently was turned into aragonite. These rapid changes found is similar to the findings of previous study [10]. Moreover, aragonite transformed into calcite (the most thermodynamically stable polymorph) within a few hours.…”

Section: Characteristics Of the Scalesupporting

confidence: 91%

Effect of tartaric acid (C4H6O6) and temperatures on induction time and variation of crystal phases of CaCO3 in a piping system

Putranto¹,

Usmany²,

Bayuseno³

et al. 2016

AIP Conference Proceedings

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Abstract. Calcium carbonate scale formation is a serious problem found in pipes of many industrial processes, such as chemical, desalination and oil industries. The presence of scale makes the narrowing of the diameter of pipes and reduction of heat transfer performance. This paper presents result of crystallization behavior of CaCO 3 in pipes. The crystals forming solutions were made by mixing of equimolar solution to CaCl 2 and Na 2 CO 3 with Ca 2+ concentration of 3,000 ppm. The parameters studied were the solution flow rates (25, 35, 50 mL/min), temperatures (27, 35, 50 o C) and tartaric acid as additives (0.00, 1.00, 10.00 ppm) for the scaling inhibition. The CaCO 3 scales formation process was monitored by measuring the change in the solution conductivity. The scale obtained was then characterized by SEM/EDS for morphology and elemental analysis, and XRD for phase composition. It was observed that the conductivity of the solution remained constant after a certain period, and subsequently it dropped sharply. This induction time obtained was varied from 28 min to 46 min depending on the parameters studied. The higher flow rates and temperatures in the solution resulted in more CaCO 3 scale mass precipitated, indicating that these two parameters may promote CaCO 3 crystallisation. However, the higher tartaric acid concentrations in the solution lead to less mass of the scale produced and could reduce the mass down to 90%. It can be postulated that the tartaric acid may be an effective additive for CaCO 3 crystallization. SEM and EDS analysis of the scale indicated that the scale was composed of calcium carbonate. In addition, XRD characterization of the scale confirmed that the scale consisted of vaterite, aragonite and calcite minerals. The scale of aragonite mineral was precipitated under the influence of tartaric acid and temperatures. This indicates that the acid could delay the transformation into stable phase of calcite.

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Section: Characteristics Of the Scalesupporting

confidence: 91%

Effect of tartaric acid (C4H6O6) and temperatures on induction time and variation of crystal phases of CaCO3 in a piping system

Putranto¹,

Usmany²,

Bayuseno³

et al. 2016

AIP Conference Proceedings

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“…Therefore, freezing does not seem to explain the particular morphology of NFC. Altay et al (2007) have demonstrated that calcite precipitates as rhombohedral crystals even at elevated temperatures. At Villiers and Savagnier, the temperatures estimated from the NFC oxygen isotope signatures, using the equation from Cerling and Quade (1993), are between 7.9 and 14.0°C (Table 8).…”

Section: Comparison Of the Stable Isotope Signatures Of The Carbonatementioning

confidence: 99%

Stable carbon and oxygen isotope signatures of pedogenic needle fibre calcite

et al. 2011

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“…As the concentration of reactive materials increases, the sample content of the vaterite increased and reduced the calcite content that related to increase the supersaturation conditions [65]. Actually, the stability of CaCO 3 polymorphic phases mainly depends on the properties of additives and their own solubility in aqueous solution [66]. The stability of these phases' solids decreases in the following order: ACC < vaterite < aragonite < calcite.…”

Section: Discussionmentioning

confidence: 99%

Formation and Stabilization of Vaterite Calcium Carbonate by Using Natural Polysaccharide

Saraya¹,

Rokbaa²

2017

ANP

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This paper aimed to study the effects of natural polysaccharide (gum arabic, GA) on the formation of vaterite calcium carbonate and its stability in aqueous solution. Gum arabic is a macromolecule that has a high molecular weight and is amphoteric in character. A 0, 2.5, 5 or 10 ml of GA solution (30%) was added to the calcium chloride solution with various initial concentrations to prepare the vaterite calcium carbonate. The calcium carbonate particles were characterized using FTIR, XRD, SEM, TEM and DSC-TG as well as calculation of phase contents. The results of XRD and FTIR analysis were showing that the presence of GA during the precipitation changes the behavior of calcium carbonate to form vaterite until at lower dose used. In addition, the molar content of vaterite increased at the expense of content of calcite with increasing the GA dose. There are slightly improvements in the vaterite content by increasing the initial concentration. The formed vaterite calcium carbonates composed of aggregates as broccoli-like or spherical shape and with particle size 1.6 -2.5 µm in diameter. TEM images showed that these aggregates composed of the sub spherical unit with diameter 15 -30 nm. The thermal behavior of prepared vaterite was conformed the mineral composition of these phases. The prepared calcium carbonate, which is formed in the presence of different doses of gum, has a stability in the aqueous solutions at different temperatures, as the analyzes indicated that a very small percentage of the vaterite were converted to calcite. The gum arabic prevented or depressed the transformation of vaterite to calcite through capped the surface of particles, i.e. it is more effective in stabilizing the vaterite phase with increasing in initial concentration and time.

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Morphosynthesis of CaCO3 at different reaction temperatures and the effects of PDDA, CTAB, and EDTA on the particle morphology and polymorph stability

Cited by 69 publications

References 20 publications

Effect of tartaric acid (C4H6O6) and temperatures on induction time and variation of crystal phases of CaCO3 in a piping system

Effect of tartaric acid (C4H6O6) and temperatures on induction time and variation of crystal phases of CaCO3 in a piping system

Stable carbon and oxygen isotope signatures of pedogenic needle fibre calcite

Formation and Stabilization of Vaterite Calcium Carbonate by Using Natural Polysaccharide

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