Thermal microstructural changes of grain-supported limestones

Soltan, Abdel Monem; Kahl, Wolf‐Achim; Hazem, M.M.; Wendschuh, Michael; Fischer, R. X.

doi:10.1007/s00710-011-0151-0

Cited by 11 publications

(7 citation statements)

References 15 publications

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“…These differences could be explained while exploring the other parameters such as influence of trace elements content, raw materials characterization and OBM cutting behaviour. Many studies [54][55][56][57][58] have reported the limestone reactivity and linked it to the calcite structure. Different grain sizes [59] and impurities within the limestone can cause variations in the limestone's textural and mineralogical properties, and subsequently influence the calcination temperature [60].…”

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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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%

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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“…The firing conditions applied in the industrial lime kilns affect the quicklime reactivity. Soltan et al (2011) found that highly reactive lime can result from different soaking times after firing at 950uC, based on the microstructure of the starting material. The crystalline phases, such as periclase, developed during the limestone calcination, retard the rate of hydration temperature (Gheevarhese et al, 2002;Potgieter et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…The specific surface area and porosity increase in the quicklime when compared with the limestone before calcination (Paolo, 2002;Trikkel and Kuusik, 2003). Soltan et al (2011) found that the amount of pores is not the main variable for increasing the lime reactivity, but it is the shape of pores. The lime enriched in the contraction fracture micropores is of higher reactivity when compared with the lime enriched with the preserved intraparticle pores.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and reactivity of calcined mud supported limestones

Soltan

Kahl

Wendschuh

et al. 2012

Mineral Processing and Extractive Metallurgy

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The petrographic characteristics of mud supported limestone samples from Egypt were examined before and after calcination at 950uC for 0?25, 0?5, 1 and 2 h. X-ray diffraction (XRD), X-ray fluorescence (XRF), transmitted light microscopy (TLM), scanning electron microscopy (SEM) and X-ray microcomputed tomography (m-CT) were used for technological samples characterisation. Both the free lime content and the hydration behaviour of the resulted quicklime after calcination were measured. The produced lime is unreactive at all applied firing conditions, except the Chalk lime at 1 and 2 h soaking, despite the high free lime content of the samples. The microstructure of the mud supported limestones is of significance on the resulted quicklime reactivity, where microfractures are formed along the cavities inside the microfossils. The mineralogical and the chemical compositions of the studied mud supported limestones are the main controlling variables on the degree of the quicklime crystallinity and consequently the reactivity. Samples enriched with P 2 O 5 show higher crystallinity of the resulted lime crystallites associated with lowest reactivity.

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“…When calcined, the grain-supported limestone, enriched with fossils, produces better lime quality than the mud-supported, dominated by micrite (Soltan et al, 2011a(Soltan et al, , 2011b. This is mainly due to the microstructural Geology Department, Ain Shams University, Cairo 11566, Egypt *Corresponding author, email abdelmonemsoltan@gmail.com behaviour of the limestones during calcination (Soltan and Serry, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…The limestone type affects the quality of the produced lime. When calcined, the grain-supported limestone, enriched with fossils, produces better lime quality than the mud-supported, dominated by micrite (Soltan et al, 2011a(Soltan et al, , 2011b. This is mainly due to the microstructural behaviour of the limestones during calcination (Soltan and Serry, 2011).…”

Section: Introductionmentioning

confidence: 99%

Applicability of Egyptian limestones for calcination

Soltan

Awad

El-Ansary

2010

Applied Earth Science

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The calcination product of limestone is a strategic industrial product. This work evaluates the suitability of AlKoraymat-AlZafarana limestones for calcination. These limestones are near to the electrical and gas stations of the Alkoraymat area, Egypt. Spot samples and channel samples were collected and tested for their petrographic, chemical and mineral composition using transmitted light microscopy, X-ray micro-tomography, scanning electron microscopy, X-ray fluorescence, X-ray diffraction, differential and thermo-gravimetric analyses. The representative channel samples were calcined in a muffle furnace at 1000uC for different decarbonation times and then analysed for the free lime determination by applying the Sugar method. About 5 million tons of chemically pure limestone are estimated at Alkoraymat. The average CaO content is 55% and the total impurity oxides (SiO 2 , Al 2 O 3 and Fe 2 O 3 ) is 0?73%. The limestone microstructure is mainly grain-supported and dominated by Nummulites cemented by neomorphic-sparitic groundmass. The optimum calcination condition is 1000uC for 1 h for all channel samples. Some samples show higher calcination rate than the others due to their characteristic interparticle together with the intra-particle pores. The post-calcination distribution maps of the limestone purity and free lime indicate that these limestones could be quarried in the SE direction for calcination and lime production.

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Thermal microstructural changes of grain-supported limestones

Cited by 11 publications

References 15 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

Microstructure and reactivity of calcined mud supported limestones

Applicability of Egyptian limestones for calcination

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