A Kinetic Study of Thermal Decomposition of Limestone Using<i>In Situ</i>High Temperature<scp>X</scp>‐Ray Powder Diffraction

Marinoni, Nicoletta; Allevi, Stefano; Marchi, Maurizio; Dapiaggi, Monica

doi:10.1111/j.1551-2916.2012.05207.x

Cited by 23 publications

(13 citation statements)

References 22 publications

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“…Dolomite in limestone lowers the decomposition temperature of the calcination process. Marinoni et al [68] showed that limestone decomposition starts with the rapid dissociation of dolomite in the first few minutes, followed by calcite decomposition. Dolomite dissociation occurs in a single step, without a calcite intermediate phase.…”

Section: Fig 3 Xrd Patterns Of the Prepared Clinkermentioning

confidence: 99%

“…Dolomite dissociation occurs in a single step, without a calcite intermediate phase. This suggests that the presence of dolomite reduces the calcination activation energy [61,62,68]. Marinoni et al [62] proposed that limestone dissociation starts with dolomite decomposition, resulting in the formation of grain cracks due to the CaMg(CO3)2 structure, increasing the surface area and so allowing CO2 diffusion [57,62,69].…”

Section: Fig 3 Xrd Patterns Of the Prepared Clinkermentioning

confidence: 99%

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Oil-based mud cutting as an additional raw material in clinker production

Al-Dhamri

Abdul‐Wahab

Velis

et al. 2020

Journal of Hazardous Materials

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Oil-Based Mud (OBM) cutting is a by-product generated during oil-well drilling. It is classified as a hazardous material; however, its chemical composition suggests that it might be suitable as a raw material in cement manufacturing. It is rich in calcium oxide, silica, and aluminium oxide, which are the major oxides in raw materials for cement manufacturing. In this research, OBM cutting is used as a constituent of the raw meal for cement clinker production. Raw meal mixtures were prepared by mixing different ratios of raw materials increasing OBM content. The impact of the addition of OBM cutting on the resulting clinker has been investigated. The results demonstrate that OBM cutting could be recycled in the manufacturing of Portland cement clinker. Clinker prepared using OBM cutting had very similar properties to that prepared from limestone. This result could represent an opportunity for solving an environmental problem. The addition of OBM cutting lowers the calcination temperature, and increases the rate of carbonate dissociation. However, it also leads to a higher free lime content in the resulting clinker, which is a result of the presence of trace elements, such as barium. Overall, its use as a raw material in cement production could provide a cost-effective, environment-friendly route for the management of OBM cutting.

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Section: Fig 3 Xrd Patterns Of the Prepared Clinkermentioning

confidence: 99%

Section: Fig 3 Xrd Patterns Of the Prepared Clinkermentioning

confidence: 99%

Oil-based mud cutting as an additional raw material in clinker production

Al-Dhamri

Abdul‐Wahab

Velis

et al. 2020

Journal of Hazardous Materials

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“…In this light, for the first time, the use of in situ high temperature X-ray powder diffraction (HT-XRPD) allows one to follow the solid state reactions, liquid phase appearance, polymorphic transformations that occur during clinker formation. This technique is widely used in materials science [24,25], whereas a few researches report in situ studies for cements [26,27,28]. By combing the in situ HT-XRPD with Rietveld method we obtained an accurate phase analysis as a function of temperature.…”

Section: Submission Files Included In This Pdfmentioning

confidence: 99%

The effects of MgO, Na2O and SO3 on industrial clinkering process: phase composition, polymorphism, microstructure and hydration, using a multidisciplinary approach

Segata

Marinoni

Galimberti

et al. 2019

Materials Characterization

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The present investigation deals with how minor elements (their oxides: MgO, Na2O and SO3) in industrial kiln feeds affect (i) chemical reactions upon clinkering, (ii) resulting phase composition and microstructure of clinker, (iii) hydration process during cement production. Our results show that all these points are remarkably sensitive to the combination and interference effects between the minor chemical species mentioned above. Upon clinkering, all the industrial raw meals here used exhibit the same formation temperature and amount of liquid phase. Minor elements are preferentially hosted by secondary phases, such as periclase. Conversely, the growth rate of the main clinker phases (alite and belite) is significantly affected by the nature and combination of minor oxides. MgO and Na2O give a very fast C3S formation rate at T > 1450 K, whereas Na2O and SO3 boost C2S. After heating, if SO3 occurs in combination with MgO and/or Na2O, it does not inihibit the C3S crystallisation as expected. Rather, it promotes the stabilisation of M1-C3S, thus indirectly influencing the aluminate content, too. MgO increseases the C3S amount and promotes the stabilisation of M3-C3S, when it is in combination with Na2O. Na2O seems to be mainly hosted by calcium aluminate structure, but it does not induce the stabilisation of the orhtorhombic polymorph, as supposed to occur. Such features play a key role in predicting the physical-mechanical performance of a final cement (i.e. rate of hydration and hardening) when used as a bulding material.

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“…[18] The different opinions on reported rate-limiting steps to the overall reaction may be largely due to sample size and experimental conditions. [19,20] However, now there is a lack of essential factors analysis for the dynamic transformation in reaction mechanisms over a wide range of particle size. As the thermal decomposition of limestone forms gaseous product and porous product layer.…”

Section: Introductionmentioning

confidence: 99%

Dynamic simulation of coupled transmission processes and reaction mechanisms in porous calcined limestone

Yang

Song

et al. 2017

Can J Chem Eng

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The particle reaction model and dynamic reaction characteristics of limestone over a wide particle size range from 0.15 to 10 mm were studied by thermogravimetric analysis and nitrogen adsorption‐desorption techniques. A clear boundary between the sintered porous product layer and the undecomposed part was found by field emission scanning electron microscopy (FESEM) analysis. A dynamic coupling model considering the effects of varied pore structure and transport resistances was established based on the appropriate particle reaction model, which allowed us to predict the decomposition ratio and reaction regimes in a broad range of particle sizes. The dynamic characteristics of pore size distribution and reaction mechanisms were discussed. Over the defined particle size range and calcination temperature range, the diffusion of gaseous product through porous product layer will become the rate determining factor as the ratio of (r0‐rc)/r0 corresponding to 25 % Damköhler number above 0.35.

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A Kinetic Study of Thermal Decomposition of Limestone UsingIn SituHigh TemperatureX‐Ray Powder Diffraction

Cited by 23 publications

References 22 publications

Oil-based mud cutting as an additional raw material in clinker production

Oil-based mud cutting as an additional raw material in clinker production

The effects of MgO, Na2O and SO3 on industrial clinkering process: phase composition, polymorphism, microstructure and hydration, using a multidisciplinary approach

Dynamic simulation of coupled transmission processes and reaction mechanisms in porous calcined limestone

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