Surface area and porosity of coal fly ash

Schure, Mark R.; Soltys, Pat A.; Natusch, D. F. S.; Mauney, T.H.

doi:10.1021/es00131a009

Cited by 73 publications

(51 citation statements)

References 12 publications

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“…The BET surface areas (determined from N2 adsorption isotherms, Figure 2) and the D50 particle size as determined by laser diffraction analysis of the calcined powder for each sample are given in Table 3. The surface areas measured for the aluminosilicate powders are an order of magnitude higher than those typically found for fly ash, which are on the order of 0.1 -10 m 2 /g [32][33][34]. The pore size distribution as determined by Barrett-Joyner-Halenda (BJH) desorption pore size and volume analysis (for mesopores) and by the Horvath-Kawazoe method with Saito-Foley modification (for micropores)…”

Section: Chemical and Physical Characterisation Of Powdersmentioning

confidence: 89%

“…This can be particularly challenging due to the wide variation of chemical and physical characteristics exhibited by commercial geopolymer precursors where a range of chemical reactivity is observed, Postprint of a paper published in Powder Technology, 29(2016): [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Version of record is available at http://dx.doi.org/10.1016/j.powtec.2016.04.006 3 meaning it is often difficult to distinguish reactive from inert species.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders

et al. 2016

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Section: Chemical and Physical Characterisation Of Powdersmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders

et al. 2016

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“…Smith [28] and Helble et al [135] found similar results. In addition, the vast majority of particles (<100 µm diameter) are essentially non-porous in nature [136]. Porous particles are typically hollow cenospheres filled with smaller, essentially non-porous spheres [137].…”

Section: -235mentioning

confidence: 99%

Toxic Substances From Coal Combustion-a Comprehensive Assessment

Senior¹,

Huggins²,

Huffman³

et al. 2001

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“…area increases with a decrease in particle size, but for the coal fly ash, the surface area mainly depends on the carbon content (Schure et al, 1985). The loss of ignition (LOI) of FA with different particle sizes exhibits a similar trend as the BET surface area, which could be ascribed to the evidence that the coarser particles of coal are less likely to burn completely when compared to finer particles.…”

Section: Characterization Of Raw and Sorted Fa Physico-chemical Propementioning

confidence: 96%

Emission and Species Distribution of Mercury during Thermal Treatment of Coal Fly Ash

Wang

Shi

Chiang

et al. 2016

Aerosol Air Qual. Res.

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The thermal treatment of coal fly ash (FA) utilized by industries will inevitably lead to the emission of mercury, potentially causing atmospheric pollution. The present study is aimed at understanding the emission amount and species distribution of mercury during FA thermal treatment, and attempts were made to further provide basic data of mercury emission for environmental utilization of the FA by industries as raw materials. The physio-chemical properties of FA were analyzed and FA samples were heated at 200-1200°C in a tubular furnace in an oxidizing atmosphere. Thermogravimetric analysis (TGA) was carried out to determine the content of residual carbon in FA. The mercury species distribution was determined using United States EPA method 3200. The results indicated that semi-mobile mercury was the main mercury species in FA. Owing to the adsorption of residual carbon on Hg 0 , more residual carbon which lead to higher proportion of semi-mobile obtained in coarser size grades. 20% of total mercury emitted at 206°C, followed by a rapid growth of the emission rate of mercury at above 206°C, and the emission of total mercury achieved to be 50% and 90% corresponding to 291°C and 515°C, respectively. A distinct transformation from semi-mobile mercury to extractable mercury occurred at 200°C due to catalytic oxidation of Hg 0 and enhance the mobility and potential toxicity of mercury. Both extractable and semi-mobile mercury decreased sharply at 300-400°C. Finally, the non-mobile mercury was emitted with combustion of residual carbon in FA at 600-800°C. It was thus concluded that measures would be taken to control emission of mercury for environmentally friendly utilization of coal FA by industries when the FA was heated higher than 300°C.

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Surface area and porosity of coal fly ash

Cited by 73 publications

References 12 publications

Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders

Synthesis of stoichiometrically controlled reactive aluminosilicate and calcium-aluminosilicate powders

Toxic Substances From Coal Combustion-a Comprehensive Assessment

Emission and Species Distribution of Mercury during Thermal Treatment of Coal Fly Ash

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