Submicroscopic model of fly ash particles

Dudas, M. J.; Warren, C.J.

doi:10.1016/0016-7061(87)90016-4

Cited by 55 publications

(26 citation statements)

References 22 publications

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“…This is possibly occurring in the AMC samples due to the high relative moisture and 11.0%-13.5% CO 2 contained in the flue gas. Examination of the interaction of atmospheric and flue gas SO 2 with fly ash particles indicates that it is possible for anhydrite (CaSO 4 ), gypsum (CaSO 4 ·2H 2 O), amorphous calcium sulfate, or various other sulfate minerals to be formed on the surface of the particles of alkaline fly ashes [25,31,50]. The observed increase in total sulfur on the AMC samples is likely due to the interaction with the 20-25 ppm SO 2 in the flue gas.…”

Section: Carbonatesmentioning

confidence: 99%

“…The fly ash particles in this study were from low sulfur sub-bituminous coal with an initial carbon content of 35-45 wt %. The combustion of the coal results in fly ash particles with inorganic oxides and hydroxides and amorphous aluminosilicates [26,50]. The approximate distribution of chemical species in JBPP fly ash particles is shown in Table 2.…”

Section: Elemental Composition and Distribution On Fly Ash Particlesmentioning

confidence: 99%

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Field Application of Accelerated Mineral Carbonation

2014

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Globally, coal-fired power plants are the largest industrial source of carbon dioxide (CO 2 ). CO 2 emissions from flue gas have potential for direct mineralization with electrostatic precipitator fly ash particles in the field. Demonstration scale accelerated mineral carbonation (AMC) studies were conducted at the Jim Bridger Power Plant, a large coal fired power plant located in Wyoming, USA. AMC produces kinetically rapid conditions for increased rates of mineralization of CO 2 , sulfur dioxide (SO 2 ) and mercury (Hg) on fly ash particles. Control and AMC reacted fly ash particles were investigated for: change in carbon (expressed as CaCO 3 ), sulfur (expressed as SO 4 2− ), and mercury (Hg) contents; topology and surface chemical composition by scanning electron microscope/energy dispersive X-ray spectroscopy analysis; chemical distribution of trace elements; and aqueous mineral solubility by the toxicity characteristic leaching procedure. Results of the AMC process show an increase in C, S, and Hg on AMC fly ash particles suggesting that multiple pollutants from flue gas can be removed through this direct mineral carbonation process. Results also suggest that the AMC process shifts soluble trace elements in fly ash to less leachable mineral fractions. The results of this study can provide insight into potential successful field implementation of AMC.

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Section: Carbonatesmentioning

confidence: 99%

Section: Elemental Composition and Distribution On Fly Ash Particlesmentioning

confidence: 99%

Field Application of Accelerated Mineral Carbonation

2014

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“…Coal fly ash generally has a silt loam texture, with 65e90% of the particles having diameters of less than 0.010 mm (Chang et al, 1977;Pandey and Singh, 2010;Nyambura et al, 2011). Ash from bituminous coal is usually finer than that produced from lignite combustion (Tolle and Arthrur, 1983;Dudas and Warren, 1987).…”

Section: Physical Propertiesmentioning

confidence: 99%

Opportunities and challenges in the use of coal fly ash for soil improvements – A review

Shaheen

Hooda

Tsadilas

2014

Journal of Environmental Management

256

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“…Fly ash particles have three main morphologies: solid sphere, cenosphere, and plerosphere [4,5]. Among these, cenospheres can be separated due to having the lowest specific gravity; because of the hollow structure, they are substantially less dense than solid spheres and plerospheres.…”

Section: Introductionmentioning

confidence: 99%

Micropore Structures in Cenosphere-Containing Cementitious Materials Using Micro-CT

Yoon

Park

2017

Advances in Materials Science and Engineering

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Cenospheres have been recently applied to increase the volume of uniform micropores in hardened cementitious materials. Therefore, application of micro-CT to cenosphere-containing binders will help better understand the micropores formed by cenospheres in the hardened materials. Accordingly, the present study prepared Portland cement paste, alkali-activated fly ash/silica fume, and alkali-activated fly ash with 60% weight replacement by cenospheres and reconstructed their micropore structures using micro-CT. From the pore structure, individual micropores were extracted and analyzed using the principal moment ratios ( 11 / 33 and 22 / 33 ). Based on the moment ratios, the representative pore shapes were determined in the different pore-volume ranges. Four-factor pore compliance contribution (4-factor PCC) model was then applied to predict the influences of the micropores on the elastic moduli of the micropore/matrix composites.

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Submicroscopic model of fly ash particles

Cited by 55 publications

References 22 publications

Field Application of Accelerated Mineral Carbonation

Field Application of Accelerated Mineral Carbonation

Opportunities and challenges in the use of coal fly ash for soil improvements – A review

Micropore Structures in Cenosphere-Containing Cementitious Materials Using Micro-CT

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