The distribution of inorganic elements between coal and mineral matter in Rumanian lignite

Nascu, H. I.; Comsulea, Dorel I.; Niac, Gavril

doi:10.1016/0016-2361(94)p4342-y

Cited by 11 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Extrapolation to pure maceral phase was not possible because ash composition data were not available to facilitate the evaluation of ash stemming from the macerals of the coal. The intersection of silicon content regression line with ash content is suggested for evaluation of the ash content resulted from the maceral phase …”

Section: Discussionmentioning

confidence: 99%

“…Many authors found linear relationships between analytical properties such as elemental composition, volatile matter content, reciprocal density, calorific value, as well as ash oxide contents, versus ash content. Most related papers were summarized in earlier contributions. , A theoretical model for the distribution of trace elements between inorganic and organic components, based on functions of ash content, was developed by Solari, Fiedler, and Schneider …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Two-Phase Model Applied to Some U.S. Coals

Niac

Mureşan

2000

Energy Fuels

Self Cite

View full text Add to dashboard Cite

Carbon, hydrogen, sulfur, nitrogen, volatile matter content, and higher heating value of 6-21 samples for each of 11 U.S. coal sorts was checked for linearity versus ash content in order to learn how well they fit the two-phase model of coals. The linear relationship is very strong for carbon content and heating value within each seam, with correlation coefficients better than -0.998 in most cases, and with relative mean square errors (mse/mean) between 0.5% and 1.5%. The relationship is good for H, N, and VM content, with mse/mean of a few percent and poor for sulfur content, with mse/mean around 40%. Except for sulfur content, for which a pronounced inhomogeneity of samples is obvious, coal behaves as being formed of two "homogeneous phases": the maceral phase and the mineral phase, each one containing wellmixed individual maceral and mineral particles of small size as compared to the mass of the sample. Within a certain area of a given seam, the only variable is the ratio between the two phases, which changes with the location in the seam, while the composition of each of the mineral phase and the maceral phase is unchanged, explaining the linearity with ash content. Extrapolation of any coal property to the ash content of pure mineral phase, i.e., to nil organic carbon content, results in the respective property of the pure mineral phase (mineral matter minus inorganic oxides of the maceral ions), which cannot be evaluated by any other means, without inducing compositional changes. For the studied coals the following properties of the mineral phase were calculated, using the linear relationships: ash, volatile matter, carbon, hydrogen, sulfur contents, and higher heating value, as well as carbon dioxide and water emerged by ashing. Mineral sulfur content relates linearly to heating value of the mineral phase, with a slope close to the heating value of pyrite.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Two-Phase Model Applied to Some U.S. Coals

Niac

Mureşan

2000

Energy Fuels

Self Cite

View full text Add to dashboard Cite

show abstract

“…The former studies describe only the IM and MM of coal, while the latter investigations give additional information for the bulk samples and to some extent for OM and IM. The chemical analyses can also provide valuable indirect mineralogical data such as contents of carbonate CO 2 , pyritic, sulfate, or elemental S, in particular if they are used on separated coal samples highly enriched in mineral concentrates or monomineral fractions. ,,,,,− However, there are serious problems with the use of chemical analyses from coal ash for calculation of original minerals present in coal by stoichiometric relationships. First, most of the elements have both organic and inorganic association in coal. ,− Second, coal as an organo−inorganic sedimentary rock with detrital and authigenic minerals does not have an actual order of mineral crystallizations such as magmatic, volcanic, and metamorphic rocks.…”

Section: Chemical Analysesmentioning

confidence: 99%

“…The chemical analyses can also provide valuable indirect mineralogical data such as contents of carbonate CO 2 , pyritic, sulfate, or elemental S, in particular if they are used on separated coal samples highly enriched in mineral concentrates or monomineral fractions. 5,12,69,98,106,[233][234][235][236] However, there are serious problems with the use of chemical analyses from coal ash for calculation of original minerals present in coal by stoichiometric relationships. First, most of the elements have both organic and inorganic association in coal.…”

Section: Chemical Analysesmentioning

confidence: 99%

Methods for Characterization of Inorganic and Mineral Matter in Coal: A Critical Overview

2003

View full text Add to dashboard Cite

The present state of the methods commonly used for inorganic and mineral matter characterization in coal is described and summarized. The application of various separation procedures, macroscopic observations, reflected and transmitted optical microscopy, scanning and transmission electron microscopy, X-ray diffraction, differential thermal and thermogravimetric analyses, Mössbauer spectroscopy, infrared spectroscopy, and chemical analyses are briefly discussed. A short critical overview on the advantages and limitations of the above listed methods as well as some recommendations during their utilization are also presented.

show abstract

“…[1][2][3] The replacement of the organic and inorganic solutions with distilled water precludes this process. [4][5][6][7][8][9][10][11][12]…”

Section: Introductionmentioning

confidence: 99%

A New Method of Coal Separa Tion in Granulometric Classes and the Study of Some Anal Ytical Properties

Atyim¹,

Bolocan-Viasu²,

Croitoru³

et al. 2007

SBJCHEM

View full text Add to dashboard Cite

Coal is a complex heterogeneous material and for its knowledge a homogeneous fractionation is necessary. Coal presents variations in the same grains depending on density, so a more adequate fractionation is obtained by its separation according to density. The density was determined with a pycnometer and the separation of coal in different fractions according to density. The organic and inorganic solutions were replaced with distilled water.

show abstract

The distribution of inorganic elements between coal and mineral matter in Rumanian lignite

Cited by 11 publications

References 4 publications

The Two-Phase Model Applied to Some U.S. Coals

The Two-Phase Model Applied to Some U.S. Coals

Methods for Characterization of Inorganic and Mineral Matter in Coal: A Critical Overview

A New Method of Coal Separa Tion in Granulometric Classes and the Study of Some Anal Ytical Properties

Contact Info

Product

Resources

About