Changes in the Concentration of Some Rare Earth Elements in Coal Waste

AbstractCoal waste is formed during coal mining and processing operations. That waste comprises mainly sedimentary rocks that occur in roofs and floors of underground workings and in partings in coal seams. It contains numerous trace elements, including rare earth elements (REEs). Hypergenic processes that take place in coal waste piles may lead to endogenous fires. Thermal transformations of waste have an effect on changes in its phase and chemical composition, including the concentration of trace elements.The paper presents changes in the content of selected rare earth elements (Sc, Y, La, Ce, Nd, Sm, Eu, Tb, Yb, Lu) in wastes of varying degree of thermal transformation. The results of REE content determination in lump samples were subjected to statistical analysis and coefficients of correlation between the studied rare earth elements and the main chemical constituents were determined.The primary carriers of REEs in coal waste are clay minerals. Phase transformations that take place at high temperatures (including dehydroxylation of clay minerals and formation of minerals characteristic of contact metamorphism) cause changes in the concentration of rare earth elements.

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Identifying Correlation of Coal Seams in the Tien Hai Area, Northern Vietnam by Using Multivariate Statistic Methods

Inżynieria Mineralna ◽

10.29227/im-2021-02-11 ◽

2021 ◽

Vol 1 (2) ◽

Author(s):

The Hung KHUONG ◽

Phuong NGUYEN ◽

Thi Cuc NGUYEN ◽

Nhu Sang PHAM ◽

Danh Tuyen NGUYEN

Keyword(s):

Trace Elements ◽

Rare Earth ◽

Coal Seam ◽

Rare Earth Elements ◽

Major And Trace Elements ◽

Coal Seams ◽

Multivariate Statistic ◽

Northern Vietnam ◽

Coal Deposits ◽

Indicator Elements

In northern Vietnam, the Tien Hai area is considered a high potential area of coal deposits. Twohundred fifty-six geochemical coal samples of 13 cores in the Tien Hai area investigate coal seams andcoal deposits to identify the correlation of coal seams. According to the statistical method and clusteranalysis of geochemical samples, the results indicate that the Mg, V, As, Ca, Zn, Cr, Co, K, Na, Sr, Fe,Ge, Re, U, Mo, Th, and Ga elements are good indicator elements of the major and trace elements in coal.Most of them comply with the normal or lognormal distribution rules. Besides, the Yb, Sc, Ho, Er, Tm,Lu, Y, Tb, Pr, Dy, and Sm elements are also good indicator elements for rare earth elements in the region.Therefore, the selected elements are used to identify the correlation of the coal seams in the Tien Hai area.Based on the similarity degree between studied objects, the results of grouping boreholes in coal seamsshow that the correlation of coal seam TV2-11 is suitable and acceptable, the coal seams TV3-6a, TV3-6b, and TV3-6c can be grouped into the coal seam TV3-6. These results present that the models can helpstudy geochemical coal samples and identify the correlation of the coal seams in the Tien Hai area.Additionally, the statistical analysis shows a remarkable degree to determine the correlation of the coalseams. Geochemical coal data can help to evaluate the indicator elements of the major, trace elements,and rare earth elements in coal seams and coal rashing of adjoining and pillar rocks in the Tien Hai area,northern Vietnam.

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Rare earth elements (REEs) recovery from coal waste of the Western Kentucky No. 13 and Fire Clay Seams. Part I: Mineralogical characterization using SEM-EDS and TEM-EDS

Fuel ◽

10.1016/j.fuel.2021.121854 ◽

2022 ◽

Vol 307 ◽

pp. 121854

Author(s):

Bin Ji ◽

Qi Li ◽

Wencai Zhang

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Coal Waste ◽

Mineralogical Characterization ◽

Western Kentucky ◽

Fire Clay

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Evaluation of carbonate diagenesis: A comparative study of minor elements, trace elements, and rare-earth elements (REE+Y) between Pleistocene corals and matrices from Grand Cayman, British West Indies

Sedimentary Geology ◽

10.1016/j.sedgeo.2014.10.004 ◽

2014 ◽

Vol 314 ◽

pp. 31-46 ◽

Cited By ~ 12

Author(s):

Rong Li ◽

Brian Jones

Keyword(s):

Trace Elements ◽

Rare Earth ◽

Comparative Study ◽

Rare Earth Elements ◽

West Indies ◽

Carbonate Diagenesis ◽

British West Indies ◽

Grand Cayman ◽

Minor Elements

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Seasonal changes in concentrations of trace elements and rare earth elements in shoot samples of Juncus effusus L. collected from natural habitats in the Holy Cross Mountains, south-central Poland

Chemosphere ◽

10.1016/j.chemosphere.2018.12.062 ◽

2019 ◽

Vol 219 ◽

pp. 954-960 ◽

Cited By ~ 3

Author(s):

Karina Krzciuk ◽

Agnieszka Gałuszka

Keyword(s):

Trace Elements ◽

Rare Earth ◽

Rare Earth Elements ◽

Seasonal Changes ◽

Juncus Effusus ◽

Natural Habitats ◽

Holy Cross Mountains ◽

Central Poland ◽

South Central

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Effective procedures for the determination of As, Cd, Cu, Fe, Hg, Mg, Mn, Ni, Pb, Se, Th, Zn, U and rare earth elements in plants and foodstuffs

Analytical Methods ◽

10.1039/c8ay01295d ◽

2018 ◽

Vol 10 (33) ◽

pp. 4094-4103 ◽

Cited By ~ 21

Author(s):

Fernanda Pollo Paniz ◽

Tatiana Pedron ◽

Bruna Moreira Freire ◽

Daiane Placido Torres ◽

Fábio Ferreira Silva ◽

...

Keyword(s):

Trace Elements ◽

Rare Earth ◽

Rare Earth Elements ◽

Icp Ms ◽

International Regulations ◽

Effective Procedures

There are several international regulations regarding trace elements. The use of ICP-MS for their determination is usually a difficult task, especially when Hg is one of the target elements.

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Comparison of the Mineral and Nutraceutical Profiles of Elephant Garlic (Allium ampeloprasum L.) Grown in Organic and Conventional Fields of Valdichiana, a Traditional Cultivation Area of Tuscany, Italy

Biology ◽

10.3390/biology10101058 ◽

2021 ◽

Vol 10 (10) ◽

pp. 1058

Author(s):

Stefano Loppi ◽

Riccardo Fedeli ◽

Giulia Canali ◽

Massimo Guarnieri ◽

Stefano Biagiotti ◽

...

Keyword(s):

Trace Elements ◽

Rare Earth ◽

Rare Earth Elements ◽

Water Content ◽

Human Health ◽

Soluble Sugars ◽

Allium Ampeloprasum ◽

Icp Ms ◽

Essential Trace Elements ◽

Reference Plant

In the Valdichiana area (Tuscany, Italy) an ancient native landrace of elephant garlic (Allium ampeloprasum L.), locally known as “Aglione della Valdichiana”, has long been cultivated. The aim of this study was to check whether there are differences in the mineral and nutraceutical profiles of the Aglione della Valdichiana cultivated conventionally and organically. Based on the analysis by ICP-MS of a wide array of major, minor, essential, and non-essential trace elements as well as rare earth elements, and the evaluation of the content of polyphenols, flavonoids, antioxidants, soluble proteins, soluble sugars, and starch, as well as the weight and water content, it was concluded that differences in the mineral and nutraceutical profiles of organically and conventionally grown bulbs were very limited. Only a statistically (p < 0.05) higher concentration of Cd (+2620%), Co (+113%), Mn (+55%), Rb (+180%), and Sb (+180%), as well as glucose (+37%) in conventionally cultivated bulbs emerged. Cadmium was the only element slightly higher than in the “reference plant,” but with a negligible risk (three orders of magnitude lower) for human health based on consumption. It is concluded that we failed to find evidence of healthier food or a higher nutraceutical quality for organically cultivated elephant garlic.

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