Aspects of the geochemistry of rare earth elements in coal: an experimental approach

Eskenazy, Greta M.

doi:10.1016/s0166-5162(98)00027-5

Cited by 118 publications

(48 citation statements)

References 20 publications

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“…Because of their stable chemical properties during coal combustion, such as higher fusion and boiling point, the REY may primarily accumulate more in the ash (Zhao 2002;Ren et al 2006). There are some researches on the coal deposits being potential alternative sources and a promising raw material for extracting REY as by-product in recent years (Eskenazy 1987(Eskenazy , 1999Seredin 1996;Ren and Dai 2009;Dai et al 2012aDai et al , 2013Dai et al , 2014Seredin and Dai 2012).…”

Section: Introductionmentioning

confidence: 99%

Anomaly and geochemistry of rare earth elements and yttrium in the late Permian coal from the Moxinpo mine, Chongqing, southwestern China

Zou

Liu

Tian

et al. 2014

Int J Coal Sci Technol

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The rare earth elements and yttrium (REY) of the K2 coal from the Moxinpo mine, Chongqing, were determined using inductively coupled plasma mass spectrometry (ICP-MS). The results show that REY are enriched in the K2 coal, with the average content up to 462 lg/g, much higher than average values of most coals in the world. The REY distribution patterns indicate that the light REY is enriched and show a well-pronounced Eu minimum. The fractionation of individual light-REY is higher than that of the heavy-REY. The REY distribution through the K2 coal seam shows that the top and bottom portion of the coal seam have a lower content of REY than the middle portion. Goyazite and rhabdophane were identified with a scanning electron microscope equipped with an energy-dispersed X-ray spectrometer (SEM-EDX). The REY distributions through the coal seam, SEM-EDX data and the correlation analysis between ash yields and the concentrations have revealed that the REY mainly occurs in the organic matter. The K2 coal is a potential rare-metal resource due to its high REY contents, and the coal ash could be regarded as a new and promising raw material for recovery of REY as a by-product.

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Section: Introductionmentioning

confidence: 99%

Anomaly and geochemistry of rare earth elements and yttrium in the late Permian coal from the Moxinpo mine, Chongqing, southwestern China

Zou

Liu

Tian

et al. 2014

Int J Coal Sci Technol

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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: 74%

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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“…In other words, HREE have a stronger organic affinity than that of LREE [28,30,31]. Eskenazy [32,33] proposed that the formation of organometallic compounds by sorption on the coagulating humic and fulvic might be the bound mechanism for REE and organic matters in coal. This idea is further confirmed by Sonke and Salters [34] and Wang et al [35].…”

Section: Organic Affinities Of Trace Elementsmentioning

confidence: 99%

“…Some indicate that LREE have stronger organic affinity than HREE [13,37]; some found HREE have stronger organic affinity than LREE [28,29]; some suggest ignorable difference between LREE and HREE [33]; while Yang [38] found that REE's organic affinity increases from La to Eu, but decreases from Gd to Lu. Finkelman (2018) [28] suggested that HREE have stronger organic affinity than LREE.…”

Section: Organic Affinities Of Trace Elementsmentioning

confidence: 99%

Washability and Distribution Behaviors of Trace Elements of a High-Sulfur Coal, SW Guizhou, China

et al. 2018

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Abstract:The float-sink test is a commonly used technology for the study of coal washability, which determines optimal separation density for coal washing based on the desired sulfur and ash yield of the cleaned coal. In this study, the float-sink test is adopted for a high-sulfur Late Permian coal from Hongfa coalmine (No.26), southwestern Guizhou, China, to investigate its washability, and to analyze the organic affinities and distribution behaviors of some toxic and valuable trace elements. Results show that the coal is difficult to separate in terms of desulfurization. A cleaned coal could theoretically be obtained with a yield of 75.50%, sulfur 2.50%, and ash yield 11.33% when the separation density is 1.57 g/cm 3 . Trace elements' distribution behaviors during the gravity separation were evaluated by correlation analysis and calculation. It was found that Cs, Ga, Ta, Th, Rb, Sb, Nb, Hf, Ba, Pb, In, Cu, and Zr are of significant inorganic affinity; while Sn, Co, Re, U, Mo, V, Cr, Ni, and Be are of relatively strong organic affinity. LREE (Light rare earth elements), however, seem to have weaker organic affinity than HREE (Heavy rare earth elements), which can probably be attributed to lanthanide contraction. When the separation density is 1.60 g/cm 3 , a large proportion of Sn, Be, Cr, U, V, Mo, Ni, Cd, Pb, and Cu migrate to the cleaned coal, but most of Mn, Sb and Th stay in the gangue. Coal preparation provides alternativity for either toxic elements removal or valuable elements preconcentration in addition to desulfurization and deashing. The enrichment of trace elements in the cleaned coal depends on the predetermined separation density which will influence the yields and ash yields of the cleaned coal.

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Aspects of the geochemistry of rare earth elements in coal: an experimental approach

Cited by 118 publications

References 20 publications

Anomaly and geochemistry of rare earth elements and yttrium in the late Permian coal from the Moxinpo mine, Chongqing, southwestern China

Anomaly and geochemistry of rare earth elements and yttrium in the late Permian coal from the Moxinpo mine, Chongqing, southwestern China

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)

Washability and Distribution Behaviors of Trace Elements of a High-Sulfur Coal, SW Guizhou, China

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