Petrology, mineralogy, and chemistry of magnetically-separated sized fly ash

Hower, James C.; Rathbone, Robert F.; Robertson, J. D.; Peterson, Gilman P.; Trimble, Alan S.

doi:10.1016/s0016-2361(98)00132-x

Cited by 86 publications

(69 citation statements)

References 3 publications

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“…Results consistent with this observation were reported in [89,90]. So the results described in literature [4,31,77,78,[82][83][84][85][86][87][89][90][91] are consistent in terms of lowrank-coal UC distribution within the PFC FA fractions. However, in the case of higher-rank coals, the results are somewhat different.…”

Section: 221supporting

confidence: 91%

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Unburned carbon from coal combustion ash: An overview

Bartoňová

2015

Fuel Processing Technology

141

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Section: 221supporting

confidence: 91%

“…The most abundant literature conclusion concerning UC distribution within PFC FA fractions is that percentage of UC increases with increasing grain size of FA fraction [4,31,77,78,[82][83][84][85][86].…”

Section: 221mentioning

confidence: 99%

Unburned carbon from coal combustion ash: An overview

Bartoňová

2015

Fuel Processing Technology

141

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“…Whatever the association in coal, Ni seems to be distributed between the silicate fraction and the magnetic fraction of fly ash during combustion. While some authors found that Ni was slightly enriched in the magnetic fraction (magnetic fraction/non-magnetic ratio=1.8) (Hower et al, 1999;Kukier et al, 2003), the observations of Kim and Kazonich (2004) pointed to an enrichment in the silicate fraction. All these studies agreed that much of the leachable Ni is solubilised from the non-magnetic fraction.…”

Section: Nickelmentioning

confidence: 94%

Leaching behaviour of elements from coal combustion fly ash: An overview

Izquierdo

Querol

2012

International Journal of Coal Geology

624

379

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Coal-based power generation produces over 750 Mt of coal ash per year globally, but under 50% of world production is utilised. Large amounts of fly ash are either stored temporarily in stockpiles, disposed of in ash landfills or lagooned. Coal ash is viewed as a major potential source of release of many environmentally sensitive elements to the environment. This paper encompasses over 90 publications on coal fly ash and demonstrates that a large number of elements are tightly bound to fly ash and may not be easily released to the environment, regardless of the nature of the ash. This review provides an extensive look at the extent to which major and trace elements are leached from coal fly ash. It also gives an insight into the factors underlying the leachability of elements and addresses the causes of the mobility. The mode of occurrence of a given element in the parent coal was found to play an important role in the leaching behaviour of fly ash. The amount of calcium in fly ash exerts a dominant influence on the pH of the ash-water system. The mobility of most elements contained in ash is markedly pH sensitive. The alkalinity of fly ash attenuates the release of a large number of elements of concern such as Cd, Co, Cu, Hg, Ni, Pb, Sn or Zn among others, but at the same time, it enhances the release of oxyanionic species such as As, B, Cr, Mo, Sb, Se, V and W. The precipitation of secondary phases such as ettringite may capture and bind several pollutants such ash As, B, Cr, Sb, Se and V.

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“…The tiny fly ash particulates spread through airborne processes and are deposited over a wide area. It has been reported that fly ashes contain significant amounts of magnetic components [3][4][5][6], and that such magnetic minerals result in a significant magnetic enhancement in soils, sediments and tree leaves around the emission sources of fly ashes [7][8][9][10][11]. Previous researches [5][6][7][8][9][10][11] have shown that magnetic particles in the fly ashes are mainly composed of magnetite, which could also be the most important source of anthropogenic magnetic particles in soils, sediments and tree leaves in the fly ash-affected areas.…”

Section: Introductionmentioning

confidence: 99%