Arsenic Speciation in Bituminous Coal Fly Ash and Transformations in Response to Redox Conditions

2016 ◽  
Vol 50 (11) ◽  
pp. 6099-6106 ◽  
Author(s):  
Amrika Deonarine ◽  
Allan Kolker ◽  
Andrea L. Foster ◽  
Michael W. Doughten ◽  
James T. Holland ◽  
...  
Keyword(s):  
Fly Ash ◽  
Bituminous Coal ◽  
Coal Fly Ash ◽  
Arsenic Speciation ◽  
Redox Conditions

Characterization of North American Lignite Fly Ashes II. XRD Mineralogy

1987 ◽  
Vol 113 ◽  
Author(s):  
G. J. McCarthy ◽  
D. M. Johansen ◽  
A. Thedchanamoorthy ◽  
S. J. Steinwand ◽  
K. D. Swanson
Keyword(s):  
Fly Ash ◽  
Bituminous Coal ◽  
Coal Fly Ash ◽  
Fly Ashes ◽  
X Ray ◽  
Mining Areas ◽  
Lignite Fly Ash ◽  
Coal Fly Ashes ◽  
Ferrite Spinel

ABSTRACTX-ray powder diffraction has been used to determine the crystalline phase mineralogy in samples of fly ash from each of the lignite mining areas of North America. The characteristic phases of North Dakota lignite fly ashes were periclase, lime, merwinite and the sulfate phases anhydrite, thenardite and a sodalite-structure phase. Mullite was absent in these low-Al2O3 ashes. Montana lignite ash mineralogy had characteristics of ND lignite and MT subbituminous coal fly ashes; mullite and C3A were present and the alkali sulfates were absent. Texas and Louisiana lignite fly ashes had the characteristic mineralogy of bituminous coal fly ash: quartz, mullite, ferrite-spinel (magnetite) and minor hematite. Even though their analytical CaO contents were 7–14%, all but one lacked crystalline CaO-containing phases. Lignite fly ashes from Saskatchewan were generally the least crystalline of those studied and had a mineralogy consisting of quartz, mullite, ferrite spinel and periclase. Quantitative XRD data were obtained. The position of the diffuse scattering maximum in the x-ray diffractograms was indicative of the glass composition of the lignite fly ash.

Leachability of elements from sub-bituminous coal fly ash from India

2002 ◽  
Vol 27 (8) ◽  
pp. 609-615 ◽  
Author(s):  
T Praharaj ◽  
M.A Powell ◽  
B.R Hart ◽  
S Tripathy
Keyword(s):  
Fly Ash ◽  
Bituminous Coal ◽  
Coal Fly Ash

Chemical and Surface Transformations of Bituminous Coal Fly Ash Used in Israel Following Treatments with Acidic and Neutral Aqueous Solutions

2014 ◽  
Vol 28 (7) ◽  
pp. 4657-4665 ◽  
Author(s):  
Roy Nir Lieberman ◽  
Nadya Teutsch ◽  
Haim Cohen
Keyword(s):  
Fly Ash ◽  
Aqueous Solutions ◽  
Bituminous Coal ◽  
Coal Fly Ash
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