Occurrence mode of major and trace elements in individual fly-ash particles

Cereda, E.; Marcazzan, G.; Pedretti, Marzio; Grime, G.W.; Baldacci, A.

doi:10.1016/0168-583x(95)00469-6

Cited by 9 publications

(6 citation statements)

References 14 publications

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“…However, published results indicate that the distribution patterns of metals in ash particles also depend on the ash matrix. Cereda and coworkers found that coal ash particles could be grouped based on their major content and the presence of trace elements was not equally distributed between the groups (Cereda et al, 1995). Particles rich in Al and Si also had high content of for instance Cu and Ni.…”

Section: Introductionmentioning

confidence: 96%

Element associations in ash from waste combustion in fluidized bed

et al. 2010

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Section: Introductionmentioning

confidence: 96%

Element associations in ash from waste combustion in fluidized bed

et al. 2010

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“…However, the effect of shape is small even for light elements and is negligible for heavy elements, in particle sizes (< 5 µm). 5,10 In this study, no shape correction did not apply and the changes in X-ray cross section and self absorption effects were considered assuming a flat homogeneous C O Others slab. Concentrations of carbon, oxygen, and hydrogen were derived from peak yields of extracted RBS and STIM spectra, which were calibrated by measuring the peak yields from Mylar films of known thickness.…”

Section: Discussionmentioning

confidence: 99%

“…For this purpose, analysis of individual fly ash particle by using microbeam analysis will provide valuable information in this field. 5 In this study, we analyzed coal fly ash from coal-fired power plants with 1 µm spatial resolution by using the simultaneous micro-PIXE/RBS/off-axis STIM system at Tohoku University. The combination of PIXE, RBS and off-axis STIM methods enabled simultaneous analysis of hydrogen to metal elements and revealed the chemical composition of these particles.…”

Section: Introductionmentioning

confidence: 99%

Pixe Analysis of Individual Particles in Coal Fly Ash

et al. 2010

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Consumption of coal is increasing as an alternative for petroleum. During the process, coal fly ash particles are produced and are disposed as an industrial waste. Coal ash contains toxic heavy metals, which leads to a concern about the possibility of leakage into environment. The spatial distribution and chemical form as well as elemental concentration of the toxic elements in the particles are important factors in assessing the leakage into the environment. In this study, we analyzed individual coal fly ash particles with 1 µm spatial resolution by using the simultaneous micro-PIXE/RBS/off-axis STIM system at Tohoku University. Eighty fly ash particles were analyzed. The particles are mainly composed of O, Si and Al and estimated as dioxide. Hydrogen and carbon are not observed in these particles. V, Zn, Sr, Cu, Ni, Mn, Cr and As are contained in the particles. The content of each element is quite different in each particle. These elements are distributed homogeneously. As an exception, Al, Ca, Fe, Zn, As and Zr are distributed on the surface of the particle which might be related to the combustion process.Keyword: Coal fly ash; individual particle analysis; simultaneous micro-PIXE/RBS/off-axis STIM analysis.

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“…The dark spots were identified as iron oxides by the SEM. The light spots were identified as mullite, which has a crystalline structure derived from aluminosilicate minerals [36][37][38]. Research on fly ash structures demonstrated that the aluminosilicate particles have complex structures and the silicate and aluminum compounds are fused together [36,38].…”

Section: Characteristics Of Fly Ashmentioning

confidence: 99%

Production of a new wastewater treatment coagulant from fly ash with concomitant flue gas scrubbing

Ling¹,

Fan²,

Brown³

et al. 2009

Journal of Hazardous Materials

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The research focused on the production of a complex wastewater coagulant containing polymeric sulfates of aluminum and iron from fly ash. At the same time, SO(2) in the simulated flu gas was removed by absorption in a fly ash slurry and oxidized with sodium chlorate. Extraction efficiency of iron and aluminum oxides from fly ash was affected greatly by reaction temperature and time. The extraction efficiency increases as temperature increases. Removal efficiency of SO(2) was influenced by temperature, SO(2) feed concentration and feed gas dispersing method. The produced complex coagulant containing both polymeric ferric sulfate (PFS) and polymeric aluminum sulfate (PAS) was proven to be effective in removing total suspended solids (TSS) and turbidity in wastewater. The complex coagulant is more effective than conventional iron and aluminum sulfates in turbidity removal.

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Occurrence mode of major and trace elements in individual fly-ash particles

Cited by 9 publications

References 14 publications

Element associations in ash from waste combustion in fluidized bed

Element associations in ash from waste combustion in fluidized bed

Pixe Analysis of Individual Particles in Coal Fly Ash

Production of a new wastewater treatment coagulant from fly ash with concomitant flue gas scrubbing

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