Investigation of glassy phase silica in low calcium content fly ash by X‐ray photoelectron spectroscopy

2021 ◽  
Author(s):  
Siddharth Singh ◽  
Soumitra Maiti
Keyword(s):  
Fly Ash ◽  
Photoelectron Spectroscopy ◽  
Glassy Phase ◽  
Calcium Content ◽  
X Ray ◽  
Low Calcium

Monitoring and characterization of creation of geopolymers prepared from fly ash and metakaolin by X-ray photoelectron spectroscopy method

2014 ◽  
Vol 34 (3) ◽  
pp. 841-849 ◽  
Author(s):  
M. Kanuchova ◽  
L. Kozakova ◽  
M. Drabova ◽  
M. Sisol ◽  
A. Estokova ◽  
...  
Keyword(s):  
Fly Ash ◽  
Photoelectron Spectroscopy ◽  
Spectroscopy Method ◽  
X Ray

Analysis of brown coal fly-ash using X-ray photoelectron spectroscopy

1991 ◽  
Vol 51 (1-2) ◽  
pp. 35-46 ◽  
Author(s):  
T. Ersez ◽  
J. Liesegang
Keyword(s):  
Fly Ash ◽  
Brown Coal ◽  
Photoelectron Spectroscopy ◽  
Coal Fly Ash ◽  
X Ray

scholarly journals Analysis of coal and coal fly ash surfaces by X-ray photoelectron spectroscopy.

1985 ◽  
Vol 34 (5) ◽  
pp. 303-305 ◽  
Author(s):  
Kichinosuke HIROKAWA
Keyword(s):  
Fly Ash ◽  
Photoelectron Spectroscopy ◽  
Coal Fly Ash ◽  
X Ray

An ESCA and SEM Study of Changes in the Surface Composition and Morphology of Low-Calcium Coal Fly Ash as a Function of Aqueous Leaching

1986 ◽  
Vol 86 ◽  
Author(s):  
Myra M. Soroczak ◽  
H. C. Eaton ◽  
M. E. Tittlebaum
Keyword(s):  
Fly Ash ◽  
Photoelectron Spectroscopy ◽  
Surface Composition ◽  
Coal Fly Ash ◽  
Near Surface ◽  
X Ray ◽  
Sem Study ◽  
Before And After ◽  
New Material ◽  
Surface Chemistries

ABSTRACTThe reactivity of coal fly ash is dependent on the chemical composition of the surface. As reactions occur the ash particle size decreases and new material is available for reaction. This means that the near-surface chemistry can also be important. In the present study the surface chemistries of three ashes are determined by x-ray photoelectron spectroscopy both before and after exposure to a hydrating/leaching environment. Scanning electron microscopy is used to reveal ash morphology. The concentration of sulfur, found at the ash surfaces as a sulfate, and sodium decreased after leaching while the amount of iron and aluminum increased. Other elements, including calcium, increased and decreased with leaching depending on which ash was analyzed. Changes which occurred in the ash morphology after the removal of leachable elements are discussed.

Preparation and characterization of ultramarine blue pigments from fly ash by using the X-ray photoelectron spectroscopy (XPS) for the determination of chemical states of sulphur in chromophores

2019 ◽  
Vol 284 ◽  
pp. 283-288 ◽  
Author(s):  
Anna Škvarlová ◽  
Mária Kaňuchová ◽  
Ľubica Kozáková ◽  
Eva Valušová ◽  
Marián Holub ◽  
...  
Keyword(s):  
Fly Ash ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Ultramarine Blue ◽  
Chemical States

Method for Direct Determination of Glassy Phase Dissolution in Hydrating Fly Ash-Cement System Using X-ray Diffraction

2016 ◽  
Vol 100 (1) ◽  
pp. 403-412 ◽  
Author(s):  
Gangapatnam V. P. Bhagath Singh ◽  
Kolluru V. L. Subramaniam
Keyword(s):  
Fly Ash ◽  
Glassy Phase ◽  
Direct Determination ◽  
X Ray Diffraction ◽  
X Ray ◽  
Phase Dissolution ◽  
Cement System

Dissolution of the glassy phase in low-calcium fly ash during alkaline activation

2018 ◽  
Vol 30 (7) ◽  
pp. 313-322 ◽  
Author(s):  
Gangapatnam V. P. Bhagath Singh ◽  
Challapalli Subrahmanyam ◽  
Kolluru V. L. Subramaniam
Keyword(s):  
Fly Ash ◽  
Glassy Phase ◽  
Alkaline Activation ◽  
Low Calcium

Application of X-ray Photoelectron Spectroscopy to the Study of Fly Ash

1978 ◽  
Vol 32 (3) ◽  
pp. 316-319 ◽  
Author(s):  
James A. Campbell ◽  
Richard D. Smith ◽  
L. E. Davis
Keyword(s):  
Fly Ash ◽  
Photoelectron Spectroscopy ◽  
Oxidation States ◽  
X Ray ◽  
Minor Elements

X-ray photoelectron spectroscopy has been used to identify and determine the oxidation states of a number of major and minor elements present on the surface of fly ash particles. With the use of a sputtering-etching procedure, relative concentrations as a function of depth were obtained for Si, Al, Fe, Ca, Na, C, O, and S. The concentrations of Na, C, O, and S were found to decrease and Si, Al, and Fe were found to increase upon sputtering to a depth of approximately 50 Å.

The Internal Structure of a Low-Calcium Fly Ash

1987 ◽  
Vol 113 ◽  
Author(s):  
Carol I. Kilgour ◽  
Sidney Diamond
Keyword(s):  
Fly Ash ◽  
Pore Solution ◽  
Glass Composition ◽  
Term Treatment ◽  
Bearing Material ◽  
X Ray ◽  
Glass Dissolution ◽  
Low Calcium ◽  
Internal Structures ◽  
Mullite Composition

ABSTRACTA low calcium fly ash, rich in iron oxide, was subjected to shaking in 1% HF for up to 20 hours, and measurements were made at intervals of the following parameters: total weight loss, composition of the dissolved material, x-ray peak intensities of crystalline components and residual glass, and internal structures present within the fly ash spheres as revealed by the progressive dissolution treatments. The same fly ash was subjected to similar but longer-term treatment with simulated cement pore solution (potassium and sodium hydroxide). The compositions of the magnetically separated fraction and the non-magnetic residue were also separately determined. As a result of these studies, it was suggested that: (a) the time at which all of the potassium is dissolved might be used as an indicator of the completion of glass dissolution; (b) the position of the x-ray band for residual (more resistant ) glass shifts to higher 2Θ angle before the glass is completely dissolved; (c) in this fly ash, as determined by chemical analysis, all of the iron is in the magnetically-separable fraction, a feature that permitted estimation of the overall glass composition; and (d) this fly ash contains certain poorly understood components including silica-rich spheres, small spheres yielding EDXA signals only for iron, and “patches” of silica and alumina bearing material not of mullite composition, but all of which are highly resistant to HF dissolution.

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