The Redistribution of Trace Elements During the Beneficiation of Coal

Akers, D.J.

doi:10.1007/978-94-015-8496-8_6

Cited by 15 publications

(5 citation statements)

References 2 publications

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“…2 are noteworthy, since more than half of the raw coal produced in the United States is processed (washed) to reduce mineral and sulfur content (Kempnich 2000). Since conventional coal washing usually reduces ash by more than half (Akers 1995), a much lower average ash value may be expected for the ICR data. Why the two data sets show such similar results is uncertain, but sampling strategy may be partly responsible.…”

Section: Observationsmentioning

confidence: 96%

Mercury in US coal: observations using the COALQUAL and ICR data

Quick

Brill²,

Tabet

2003

Env Geol

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The COALQUAL data set lists the mercury content of samples collected from the in-ground US coal resource, whereas the ICR data set lists the mercury content of samples collected from coal shipments delivered to US electric utilities. After selection and adjustment of records, the COAL-QUAL data average 0.17 lg Hg/g dry coal or 5.8 kg Hg/PJ, whereas the ICR data average 0.10 lg Hg/g dry coal or 3.5 kg Hg/PJ. Because sample frequency does not correspond to the inground or produced tonnage, these values are not accurate estimates of the mercury content of either in-ground or delivered US coal. Commercial US coal contains less mercury than previously estimated, and its mercury content has declined during the 1990s. Selective mining and more extensive coal washing may accelerate the current trend towards lower mercury content in coal burned at US electric utilities.

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Section: Observationsmentioning

confidence: 96%

Mercury in US coal: observations using the COALQUAL and ICR data

Quick

Brill²,

Tabet

2003

Env Geol

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“…Meanwhile, concentration of HTEs can also be reduced during the washing process. The removal efficiency of Ni content through coal cleaning vary significantly from~20% to~80% (DeVito et al, 1984;Akers, 1995;Quick and Irons, 2002;Han and Xu, 2003;Wang, 2007). In view of the application situation and the operation characteristics of coal cleaning processes in China, we presume an averaged removal efficiency of 58.49% independent of Ni content in coals.…”

Section: Nickel Content In Coals and Coal Productsmentioning

confidence: 99%

Anthropogenic atmospheric nickel emissions and its distribution characteristics in China

Tian

Cheng

et al. 2012

Science of The Total Environment

109

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“…The lack of direct information on Be is due in part to its low abundance in coal (Tab. I) and its low atomic number (4), making it difficult to analyze by conventional bulk and microanalysis methods [41]. Available information on Be suggests an organic association, [37, 38] but Be substitution for Al or Si in silicates is also recognized, as would be predicted from its ionic radius.…”

Section: Brief Summary Of Haps Modes Of Occurrencementioning

confidence: 99%

“…Because these phases are the most abundant mineral constituents in coal, elemental substitution even at the 10-100ppm level can constitute a major portion of the mass fraction for a given element. As a result, significant reductions for some HAPs can be achieved simply by reducing ash yields through physical coal cleaning [4][5][6]. The general uniformity of coal mineralogy may have some benefit in understanding the behavior of HAPs and reducing their abundance, but it is important to recognize that these elements may also be present in coal in minor-or trace-phases.…”

Section: Coal As a Geochemical Systemmentioning

confidence: 99%

Potentially Hazardous Elements in Coal: Modes of Occurrence and Summary of Concentration Data for Coal Components

Kolker

Finkelman

1998

Coal Preparation

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Mode-of-occurrence data are summarized for 13 potentially hazardous elements (Be, Cr, Mn, Co, Ni, As, Se, Cd, Sb, Hg, Pb, Th, U) in coal. Recent work has refined mode-ofoccurrence data for Ni, Cr, and As, as compared to previous summaries. For Cr, dominant modes of occurrence include the clay mineral illite, an amorphous CrO(OH) phase, and Cr-bearing spinels. Nickel is present in Fe-sulfides (pyrite and marcasite) and is also organically bound. Arsenic-bearing pyrite may be the dominant host of As in bituminous coals.. Concentration data for the 13 HAPs, obtained primarily by quantitative microanalysis techniques. are compiled for mineral and organic portions of coal. HAPs element concentrations are greatest in Fe-sulfides, and include maxima of 2,300ppm (Co), 4,500ppm (Ni), 4.9wt.% (As), 2,OOOppm (Se), 171 ppm (Hg), and 5,500ppm (Pb). Trace-element microanalysis is a significant refinement over bulk methods, and shows that there is considerable trace-element variation on a fine scale for a given coal, and from one coal to another.

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The Redistribution of Trace Elements During the Beneficiation of Coal

Cited by 15 publications

References 2 publications

Mercury in US coal: observations using the COALQUAL and ICR data

Mercury in US coal: observations using the COALQUAL and ICR data

Anthropogenic atmospheric nickel emissions and its distribution characteristics in China

Potentially Hazardous Elements in Coal: Modes of Occurrence and Summary of Concentration Data for Coal Components

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