Rare earth elements and yttrium in lithotypes of Bulgarian coals

Eskenazy, Greta M.

doi:10.1016/0146-6380(87)90030-1

Cited by 110 publications

(39 citation statements)

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“…In particular, rare earth elements (REEs) in coal have been identified as a group of special significance (Birk and White, 1991;Eskenazy, 1987;Mukhopadhyay et al, 1998;Querol et al, 1997). This is because REEs have two remarkable characteristics: (i) they exhibit a similar chemical behavior that imparts coherency to geochemical events, and (ii) they exhibit a systematic increase in the number of f electrons with increasing atomic number within the lanthanide series, which causes subtle chemical differences in passing from La to Lu.…”

mentioning

confidence: 99%

Rare earth element distribution in the acetic acid soluble fraction of combusted coals: Its implication as a proxy for the original coal-forming plants

Akagi

Suzuki

et al. 2004

Geochem. J.

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The precise concentrations of rare earth elements (REEs) in Japanese Ashibetsu and Taiheiyo coals, in Indonesian Ambalut coal, and in Australian boghead coal have been determined, in order to compare the REE contents of the coals with those of plants and also to obtain further knowledge of the original plants from which these coals were formed. By leaching the coals after ashing using a 10% acetic acid solution, each coal sample was separated into two fractions: an acetic acid soluble fraction, and an acetic acid insoluble fraction. Our results show that three different types of chondritenormalized REE patterns are observed in the acetic acid soluble fraction of these coals. The acetic acid soluble fractions of the Ashibetsu, the Taiheiyo, and some of the Ambalut coals showed REE patterns identical to those of peat vegetation. Those of other Ambalut coals showed an REE pattern that was similar to that of tree trunks. The boghead coal showed a different REE pattern that was similar to algae, an origin that is also suggested from a maceral study. The REE patterns of the acetic acid soluble fraction can therefore be a useful proxy for determining the original plants that formed the coals.

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mentioning

confidence: 99%

Rare earth element distribution in the acetic acid soluble fraction of combusted coals: Its implication as a proxy for the original coal-forming plants

Akagi

Suzuki

et al. 2004

Geochem. J.

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“…The higher value of the correlation coefficient for the HREE and (OM) than the LREE and (OM) (r = 0.48 and r = 0.11, respectively), however, indicates a slightly higher relation of organic substance with HREE than LREE. Such dependence is frequently observed for coals all over the world (Plamer, 1990;Querol et al,1995;Eskenazy, 1987aEskenazy, , 1987bEskenazy, 1999). The REE contents determined for the tested ashes have been normalized to chondrites.…”

Section: Rare Earth Elementsmentioning

confidence: 99%

Rare Earth Elements of Orzeskie Beds of South-West Part Upper Silesian Coal Basin (Poland) / Pierwiastki Ziem Rzadkich Z Pokładów Węgla Warstw Orzeskich Południowo-Zachodniej Części Gzw (Polska)

Adamczyk¹,

Białecka²,

Moszko³

et al. 2015

Archives of Mining Sciences

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PIERWIASTKI ZIEM RZADKICH Z POKŁADÓW WĘGLA WARSTW ORZESKICH POŁUDNIOWO-ZACHODNIEJ CZĘŚCI GZW (POLSKA)The subject of the research concerned the coal samples from 360/1, 361 and 362/1 seams of the Orzesze beds in the "Pniówek" coal mine. The obtained samples were characterized by low ash content -2.22-6.27% of the mass. The chemical composition of the ash indicates the presence of aluminosilicate minerals in the analyzed coal samples -most likely clay minerals, the presence of which has been confirmed in microscopic tests of the petrographic composition of channel samples of coal.The content of rare earth elements (REE sum) in the ash of the tested coal seams ranged from 364 to 1429 ppm. Variation of the REE content has been observed within a single seam.The fraction of REE indicates a relation with a mineral substance. No relation of the REE fraction and the presence of red beds has been found based on the tested samples.The content of REE found in ash, normalized to chondrites, is characterized by LREE enrichment in relation to HREE. The Eu anomaly is most likely related to tuff and tonstein levels occurring in Orzesze beds, which accompany the coal seams in the Upper Silesian Coal Basin (i.a., south of the studied area).The research has indicated that LREE in the tested samples are more related to the mineral substance, while HREE have a stronger affinity with organic substances.Keywords: rare earth elements (REE), coal, Orzesze beds, USCB Przedmiotem badań były próbki węgla z pokładów 360/1, 361 i 362/1 warstw orzeskich KWK Pniówek. Próbki te charakteryzują się niewielką zawartością popiołu 2,22-6,27% mas. Skład chemiczny popiołów wskazuje na obecność w analizowanych próbkach węgla minerałów z grupy glinokrzemianów najprawdopodobniej minerałów ilastych, których obecność była stwierdzona w badaniach mikroskopowych składu petrograficznego próbek bruzdowych węgla.Zawartości pierwiastków ziem rzadkich (suma REE) w popiołach badanych pokładów węgla wahają się od 364 do 1429 ppm. Obserwuje się zróżnicowanie zawartości REE w obrębie jednego pokładu. 158Udział REE wykazuje związek z substancją mineralną. Nie stwierdzono związku udziału REE, w badanych próbkach, z obecnością utworów pstrych w stropie karbonu.Zawartości REE oznaczone w popiołach, znormalizowane do chondrytów, charakteryzują się wzbogaceniem LREE wobec HREE. Anomalia Eu związana jest prawdopodobnie z występującymi w warstwach orzeskich (m.in. na północ od obszaru badań) Górnośląskiego Zagłębia Węglowego poziomami tufów i tonsteinów, które towarzyszą pokładom węgla.Badania wykazały, że LREE w badanych próbkach związane są raczej z substancją mineralną, natomiast HREE posiadają silniejsze powinowactwo z substancją organiczną.Słowa kluczowe: pierwiastki ziem rzadkich (REE), węgiel kamienny, warstwy orzeskie, GZW

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“…HREY have stronger ability to form soluble complexes and can be more easily to dissolve and migrate in seawater in comparison with LREY, due to shorter ionic radius of HREY (Eskenazy, 1987a;1987b). Fine clay minerals and organic matter give priority to adsorb and precipitate HREY, which leads to relative enrichment of HREY (Seredin and Shpirt, 1999;Liang et al, 2013).…”

Section: Energy Exploration and Exploitationmentioning

confidence: 99%

“…From a genetic point of view, REY abundance can be used to identify various coal-forming environments and their geochemical distribution patterns have been used to provide significant information about the nature of sediment source rocks (Eskenazy, 1987a;1987b;Finkelman, 1995;Ketris and Yudovich, 2009;Dai et al, 2008a;Zhao et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Abundance and Geological Implication of Rare Earth Elements and Yttrium in Coals from the Suhaitu Mine, Wuda Coalfield, Northern China

Kang

Zhao

Wang

et al. 2014

Energy Exploration & Exploitation

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Inductively coupled plasma mass spectrometry (ICP-MS) was used to determine the concentrations of rare earth elements and yttrium (REY) in coal and associated rock samples from the Suhaitu Mine, Wuda Coalfield, Northern China. The concentration of REY in the No. 15 coal of the Suhaitu Mine is lower than that in normal Chinese coal, but is slightly higher than that in normal world hard coal. The roof and some partings of the No. 15 coal have been leached by ground water. The geochemical patterns of REY indicate that the LREY-HREY have been slightly fractionated, which may be related to the homogenization of rare earth elements and yttrium in seawater. The REY distribution patterns for most of coal benches of the No. 15 coal are of H-REY type or H-M-REY type. This may be attributed to the influence of seawater and stronger organic affinity of the HREY than that of the LREY. The correlations of REY concentration and the ash yield indicate that REY in the No. 15 coal are associated with clay minerals and REY-bearing organic compounds.

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Rare earth elements and yttrium in lithotypes of Bulgarian coals

Cited by 110 publications

References 9 publications

Rare earth element distribution in the acetic acid soluble fraction of combusted coals: Its implication as a proxy for the original coal-forming plants

Rare earth element distribution in the acetic acid soluble fraction of combusted coals: Its implication as a proxy for the original coal-forming plants

Rare Earth Elements of Orzeskie Beds of South-West Part Upper Silesian Coal Basin (Poland) / Pierwiastki Ziem Rzadkich Z Pokładów Węgla Warstw Orzeskich Południowo-Zachodniej Części Gzw (Polska)

Abundance and Geological Implication of Rare Earth Elements and Yttrium in Coals from the Suhaitu Mine, Wuda Coalfield, Northern China

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