Chemical composition and structure of the shell of fly ash non-perforated cenospheres produced from the combustion of the Kuznetsk coal (Russia)

Anshits, N. N.; Михайлова, О. А.; Саланов, А. Н.; Anshits, A. G.

doi:10.1016/j.fuel.2010.03.049

Cited by 74 publications

(81 citation statements)

References 21 publications

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“…6. From the results of individual analyses of fly ash particles it was seen that a majority of fly ash particles showed contents of Si > 50 %, and Al > 20 %, and the linear equations obtained for all fly ashes are nearly the same as those obtained by [41]. The brighter particles with a spherical shape were an exception to this, as they showed high contents of Fe.…”

Section: Edx Individual Particle Analysesmentioning

confidence: 57%

Determining the Role of Individual Fly Ash Particles in Influencing the Variation in the Overall Physical, Morphological, and Chemical Properties of Fly Ash

et al. 2016

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Abstract. The properties of fly ashes vary because of the differences in the properties of their individual particles, and the determination of variation in these properties is of interest to the industries which use pulverized raw fly ash in applications, such as in cementitious materials and in the recovery of certain rare elements from raw fly ash. To investigate the differences in individual particles, four pulverized raw fly ashes from thermal power plants of the Czech Republic were used in this research. It was observed from FE-SEM that all four fly ashes consist of glassy hollow spherical, solid spherical, porous spherical, bright spherical, porous slaggy and compact slaggy particles. Box and whisker diagrams were plotted from the data of EDX individual particle analyses, which showed that the data of percentages for the Si, Al, and Fe elements is more scattered as compared to other elements. It was further observed from ternary phase diagrams and pseudo coloured images, that nature of fly ash particles changes from alumino silicate glassy to alumino silicate calcite metallic to pure ferro-metallic, where glassy particles showed high percentages and pure calcite particles were absent in fly ashes. Furthermore, a comparison between the XRF, the EDX total area analyses, showed that the EDX individual particle analysis gives more realistic and reliable data with median, mean, and the standard deviation for percentages of each element present in the fly ashes.

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Section: Edx Individual Particle Analysesmentioning

confidence: 57%

Determining the Role of Individual Fly Ash Particles in Influencing the Variation in the Overall Physical, Morphological, and Chemical Properties of Fly Ash

et al. 2016

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“…10 which was also developed by [35] to check the effect of dry separation on linear relationship between Si and Al in fly ash individual particles. The particles having contents in the range of Si > 50% and Al > 20% were plotted in Fig.…”

Section: Edx Individual Particle Analysesmentioning

confidence: 99%

“…Fine products particles are glassy particles while coarse products particles are glassy metallic particles having more contents of Fe per particle. Glassy Si rich particles have strong relationship between percentages of Si and Al [35] while glassy metallic particles rich in Fe have weak linear relationship between Si and Al. Si (%)…”

Section: Edx Individual Particle Analysesmentioning

confidence: 99%

Dry separation of brown coal fly ash, determination of its physical, morphological, chemical, and mechanical properties of its cementitious mixes

Haider

Bittnar²,

Ali³

et al. 2017

Period. Polytech. Civil Eng.

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The dry separation of brown coal fly ash was carried out in this research using ultrafine air classifier. Classifiers wheel speed was increased from 2000 to 10000 rpm to obtain fine and coarse products. As the speed of classifier was increased diameter of particles decreased and particle morphology was observed on optical, electron microscopes which showed that at 10000 rpm classifiers wheel speed, average fine particles morphology changed from angular and rounded irregular slaggy particles to spherical particles. High volume cementitious mixes were prepared with fine and coarse products in which cement -60% fine products samples showed a considerable increase of compressive strength as compared to cementitious raw fly ash control samples.

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“…A diagram of the new type of catalyst grain is shown in Figure 1. The cenospheres are a fraction of fl y ash generated during combustion of pulverized coal, and can be obtained from solid products of reactions in power plants 19,20 . Their specifi c characteristics such as lightness, sphericity and hollowness make the microspheres easy to fl uidize.…”

Section: Introductionmentioning

confidence: 99%

Oxidative decomposition of methanol in a vibroacoustic fluidized bed of Ag-coated cenosphere core-shell catalyst

Berkowicz

Żukowski

Baron

2016

Polish Journal of Chemical Technology

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The paper presents results of a study of oxidative decomposition of methanol in a fl uidized bed of silver catalyst. The process of methanol oxidation was carried out on Ag-coated cenospheres core-shell catalyst. The catalyst was obtained by precipitation of silver from methanolic solution of silver nitrate on cenospheres. Cenospheres are lightweight, inert, hollow spheres, which can be easily introduced into a fl uidized bed. Application of the catalyst in a form of fl uidized bed should ensure good temperature equalization which is very important at low temperatures due to the possibility of generation of formaldehyde. It turned out that local hot points occur in that kind of a catalyst (in the form of a fl uidized bed but with very low density), thus use of additional acoustic wave is necessary to ensure good control over the temperature of the process. The products of the process of methanol oxidation were monitored on-line by Fourier transform infrared spectroscopy (FTIR). The catalyst has proven to be highly active in the oxidative decomposition of methanol. Full of methanol conversion in reaction of complete oxidation was achieved at 350 o C.

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Chemical composition and structure of the shell of fly ash non-perforated cenospheres produced from the combustion of the Kuznetsk coal (Russia)

Cited by 74 publications

References 21 publications

Determining the Role of Individual Fly Ash Particles in Influencing the Variation in the Overall Physical, Morphological, and Chemical Properties of Fly Ash

Determining the Role of Individual Fly Ash Particles in Influencing the Variation in the Overall Physical, Morphological, and Chemical Properties of Fly Ash

Dry separation of brown coal fly ash, determination of its physical, morphological, chemical, and mechanical properties of its cementitious mixes

Oxidative decomposition of methanol in a vibroacoustic fluidized bed of Ag-coated cenosphere core-shell catalyst

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