Coal ash and limestone interactions in quicklime production

Sandström, Karin; Broström, Markus; Eriksson, Matias

doi:10.1016/j.fuel.2021.120989

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…The results of atomic percentage (Table S1) indicated that both CFA and CBA have similar contents with mainly Si, O, Fe, and Al atoms as well as small amounts of Mg and C atoms. These results are consistent with the previously reported literature studies on coal ashes [32][33][34]. Although the presence of C atoms in coal ashes might be due to the residual carbonaceous materials, the low amounts of C atoms might be attributed to the excess oxidation condition in the steam boiler [35].…”

Section: Characterizations Of Cfa and Cbasupporting

confidence: 93%

A comparative study of coal fly and bottom ashes as sustainable electroactive vibration damping materials

Begen,

Calis-Ismetoglu,

Gumus

et al. 2023

Environmental Engineering Research

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Coal is used in most of the power and chemical plants to meet energy needs which produce various waste ashes. Reuse of these ashes as electroactive materials has great importance for sustainable development. In this study, it was detected that the main components of coal fly (CFA) and bottom ashes (CBA) were oxides of silica (SiO2), iron (Fe2O3), aluminium (Al2O3), and magnesium (MgO), besides carbon. These are well-known electrorheological (ER) active materials. The aim of this study is to reveal dielectric and electroactive vibration damping capabilities of CFA and CBA. According to the dielectric and ER flow tests carried out in insulating silicone oil (SO), the optimum concentration of particles was determined to be 35 wt.% for both ashes. Higher ER yield stress (τy = 135 Pa), higher ER efficiency (32.8), and better viscoelastic properties (τc = 128 Pa, G' = 680 kPa) under 3.0 kV mm-1 applied electric field were obtained for 35CFA/SO suspension system compared to 35CBA/SO (τy = 125 Pa, EReff = 24.0, τc = 55 Pa, G' = 260 kPa). Although it was concluded that both ashes can be upcycled to sustainable and smart vibration damping alternative materials, better performance was observed for CFA particles.

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Section: Characterizations Of Cfa and Cbasupporting

confidence: 93%

A comparative study of coal fly and bottom ashes as sustainable electroactive vibration damping materials

Begen,

Calis-Ismetoglu,

Gumus

et al. 2023

Environmental Engineering Research

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“…The thermal behavior of quicklime in lime kiln conditions and the suitability of limestone for quicklime production has been extensively investigated, e.g., regarding general suitability [17], block formation tendencies in shaft kilns [18], product reactivity [19][20][21], thermal decrepitation [22], fuel ash interactions on quicklime surfaces [23,24], interactions of chlorine and sulfur with the quicklime product [25], specific heat capacity [26], and thermal conductivity [27].…”

Section: Introductionmentioning

confidence: 99%

Impact of Limestone Surface Impurities on Quicklime Product Quality

Eriksson,

Sandström,

Carlborg

et al. 2024

Minerals

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Quicklime is produced through the thermal processing of limestone in industrial kilns. During quarry operations, fine particulate quarry dust adheres to limestone lump surfaces, increasing the bulk concentration of impurities in limestone products. During thermal processing in a kiln, impurities such as Si, Mg, Al, Fe, and Mn react with Ca, reducing quicklime product quality. Which reactant phases are formed, and the extent to which these result in a reduction in quality, has not been extensively investigated. The present study investigated as-received and manually washed limestone product samples from two operational quarries using elemental compositions and a developed predictive multi-component chemical equilibrium model to obtain global phase diagrams for 1000–1500 °C, corresponding to the high-temperature zone of a lime kiln, identifying phases expected to be formed in quicklime during thermal processing. The results suggest that impurities found on the surface of the lime kiln limestone feed reduce the main quality parameter of the quicklime products, i.e., calcium oxide, CaO (s), content by 0.8–1.5 wt.% for the investigated materials. The results also show that, in addition to the effect of impurities, the quantity of CaO (s) varies greatly with temperature. More impurities result in more variation and a greater need for accurate temperature control of the kiln, where keeping the temperature below approximately 1300 °C, that of Hatrurite formation, is necessary for a product with higher CaO (s).

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“…Limestone composes of dolomite magnesium carbonate (CaMg[CO3]2) and other constituents, such as iron, potassium, pyrite, silica, and quartz (Romero et al, 2021;Lewicka et al, 2020). During thermal processing, carbonate decomposes and form calcium oxide (CaO) and gaseous carbon dioxide (CO2) (Sandström et al, 2021;Fedunik-Hofman et al, 2019;Giammaria and Lefferts, 2019). Quicklime is an essential raw material for industrial applications, such as food processing, water, and wastewater treatment, plastics, glass, and agriculture (Yadav et al, 2021;Ontiveros-Ortega et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Calcination Temperature on The Quality of Quicklime from Different Limestone Mines in West Sumatera, Indonesia

Desmiarti

Sari

Firdaus

et al. 2022

J. appl. agricultural sci. technol.

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Quicklime is a widely used industrial chemical and its characteristics may be affected by the limestone characteristics and calcination temperature. The present study investigated the quicklime characteristics obtained from limestone after calcination at different temperatures (800, 900, and 1000 ℃) from six geological-different mines in West Sumatera, Indonesia. X-ray fluorescence (XRF) analysis was performed to characterize the elemental compositions in limestone and quicklime. The stoichiometric evaluation was examined to compare the obtained carbon dioxide (CO2) from experimental and theoretical results during calcination. Based on elemental composition from XRF analysis, all the investigated limestones are very pure limestones, with impurities of less than 1%. The level of calcium oxide (CaO) after calcination at 1000℃ increased to more than 90% for all investigated limestone. The obtained CaO and CO2 mass after calcination at 1000℃ for 5 h were more than 70 and 60 grams, respectively. However, the experimental results on CaO and CO2 mass were 5–12% less than theoretical mass, reflecting the partial decomposition of calcium carbonate during the calcination process.

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Coal ash and limestone interactions in quicklime production

Cited by 7 publications

References 22 publications

A comparative study of coal fly and bottom ashes as sustainable electroactive vibration damping materials

A comparative study of coal fly and bottom ashes as sustainable electroactive vibration damping materials

Impact of Limestone Surface Impurities on Quicklime Product Quality

The Effect of Calcination Temperature on The Quality of Quicklime from Different Limestone Mines in West Sumatera, Indonesia

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