Decomposition kinetics of CaCO3 dry coated with nano-silica

Kumar, D. Jaya Prasanna; Maiti, Sanat Chandra; Ghoroi, Chinmay

doi:10.1016/j.tca.2015.11.019

Cited by 23 publications

(6 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The following further analysis the pre-exponential factor and the kinetic model function. The kinetic models that have been successfully applied in solid calcination dynamics 28,85 are shown in Table 1. According to the assumptions on the rate-determining steps, the models are categorized into six sorts: power law model (P n ), exponential model (E 1 ), Avrami−Erofeev model (A n ), phase interface geometric shape model (R n ), diffusion mechanism model (D n ), and reaction order model (F n ).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Researchers evaluated the kinetic parameters compatible with the CaCO 3 decomposition mechanism in the isothermal and nonisothermal conditions using differential and integral methods. The activation energy can be obtained by combining experimental data by both model fitting and model-free isoconversion rate methods, with values typically ranging from 100 to 230 kJ/mol. − For powdered CaCO 3 calcination kinetics, reported models include the diffusion control model and the chemical reaction control model. Some research demonstrated that the CaCO 3 decomposition mechanism followed the diffusion control model (one-dimensional (1D) or two-dimensional (2D)). , Numerous investigations have confirmed the predominance of the chemical mechanism (phase boundary or nucleation and nuclear growth). − Additionally, there are also some studies on the effect of CaCO 3 physicochemical features, heating rate, and CO 2 partial pressure on the chemical reaction mechanism. ,− …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigations on Kinetics and Mechanisms of CaCO₃ Calcination in Calcium Looping

Guo

Xue

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Calcium looping-based CO2 capture is generally considered more efficient than conventional postcombustion CO2 capture. Calcium carriers’ calcination in the regenerator is crucial because proper operating parameters can provide regenerated carriers suitable for the gasifier and prevent sintering. This work focuses on the calcination behavior of CaCO3 in calcium looping systems. In this study, the calcination kinetic parameters under various conditions were investigated using a model-free isoconversional method based on nonisothermal thermogravimetric analysis in a macroscope, in combination with X-ray diffraction tests of the samples in a microscope. Results in the macroscope showed that the apparent activation energy ranges from 121.8 to 163.0 kJ/mol under a conversion range of 0.3–0.9, and the CaCO3 calcination mechanism involves transient nucleation and two-dimensional growth. Results observed from the microscope demonstrated that CaCO3 tends to be calcined on a plane, consistent with the macroscope model with two-dimensional nucleation. Since the microscopic mechanism is reflected, the kinetic model can be widely adopted, and calcium-based carrier modification strategies can also be proposed to prevent sintering of the carrier perpendicular to the (1̅04) plane.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigations on Kinetics and Mechanisms of CaCO₃ Calcination in Calcium Looping

Guo

Xue

et al. 2023

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…According to Figure 8 , the existence of elements calcium, magnesium, aluminum, silica, and oxygen in the produced concrete structure can be confirmed. The elimination of elements carbon and oxygen with increasing temperature can be due to the decomposition of the calcium carbonate in the concrete structure according to the following reaction [ 36 ]:

…”

Section: Resultsmentioning

confidence: 99%

Physicochemical, Mineralogical, and Mechanical Properties of Calcium Aluminate Cement Concrete Exposed to Elevated Temperatures

2021

View full text Add to dashboard Cite

One commonly used cement type for thermal applications is CAC containing 38–40% alumina, although the postheated behavior of this cement subjected to elevated temperature has not been studied yet. Here, through extensive experimentation, the postheated mineralogical and physicochemical features of calcium aluminate cement concrete (CACC) were examined via DTA/TGA, X-ray diffraction (XRD), and scanning electron microscopy (SEM) imaging and the variation in the concrete physical features and the compressive strength deterioration with temperature rise were examined through ultrasonic pulse velocity (UPV) values. In addition, other mechanical features that were addressed were the residual tensile strength and elastic modulus. According to the XRD test results, with the temperature rise, the dehydration of the C3AH6 structure occurred, which, in turn, led to the crystallization of the monocalcium dialuminate (CA2) and alumina (Al2O3) structures. The SEM images indicated specific variations in morphology that corresponded to concrete deterioration due to heat.

show abstract

“…This method gives more accurate apparent activation energy (Ea) as compared to Ozawa-Flynn-Wall method. 21,26) Thus, in this work KAS method is used which is originally recommended by Coats and Redfern.…”

Section: -24)mentioning

confidence: 99%

Mechanochemical Effects on the Roasting Behavior of Vanadium-bearing LD Converter Slag in the Air

Xiang

Huang

et al. 2017

ISIJ Int.

View full text Add to dashboard Cite

Decomposition kinetics of CaCO3 dry coated with nano-silica

Cited by 23 publications

References 56 publications

Investigations on Kinetics and Mechanisms of CaCO₃ Calcination in Calcium Looping

Investigations on Kinetics and Mechanisms of CaCO₃ Calcination in Calcium Looping

Physicochemical, Mineralogical, and Mechanical Properties of Calcium Aluminate Cement Concrete Exposed to Elevated Temperatures

Mechanochemical Effects on the Roasting Behavior of Vanadium-bearing LD Converter Slag in the Air

Contact Info

Product

Resources

About

Decomposition kinetics of CaCO3 dry coated with nano-silica

Cited by 23 publications

References 56 publications

Investigations on Kinetics and Mechanisms of CaCO3 Calcination in Calcium Looping

Investigations on Kinetics and Mechanisms of CaCO3 Calcination in Calcium Looping

Physicochemical, Mineralogical, and Mechanical Properties of Calcium Aluminate Cement Concrete Exposed to Elevated Temperatures

Mechanochemical Effects on the Roasting Behavior of Vanadium-bearing LD Converter Slag in the Air

Contact Info

Product

Resources

About

Investigations on Kinetics and Mechanisms of CaCO₃ Calcination in Calcium Looping

Investigations on Kinetics and Mechanisms of CaCO₃ Calcination in Calcium Looping