Rare metal elements in the primary coal seam of Changzhi coalfield in Southeast Shanxi, China

2020 ◽  
Vol 38 (4) ◽  
pp. 1140-1158
Author(s):  
Chunhui Li ◽  
Yu Gao ◽  
Handong Liang ◽  
Qingyi Cao ◽  
Shikui Wang
Keyword(s):  
Rare Earth ◽  
Coal Seam ◽  
Inductively Coupled Plasma ◽  
Rare Metal ◽  
X Ray ◽  
Metal Elements ◽  
Inductively Coupled ◽  
Average Value ◽  
Industrial Grade ◽  
Permian Coal

Geochemistry characteristics of rare metal elements of No.15 Permian coal seam in Changzhi coalfield, such as concentration, distribution, occurrence, and mining value were investigated by low-temperature ashing prior to powder X-ray diffraction, X-ray fluorescence, inductively coupled plasma mass spectrometry, and field emission scanning electron microscopy equipped with energy-dispersive X-ray analysis. The results showed that the ∑REE concentrations ranged from 19.12 to 268.21 μg/g, with an average value of 91.74 μg/g; the average concentrations of Ga, Ge, and Th were 11.03, 1.96, and 15.09 μg/g, respectively. The concentration of rare earth elements (REEs), Th, Ga, and Ge, are all below the minimum industrial grade. However, the concentrations of rare earth oxides and Ge in high-temperature ash of some coal benches are higher than the minimum recoverable value and are thus potentially recoverable. The vertical distribution of REEs is uneven, with a maximum value adjacent to a minimum value. The source of the different layers of REEs was stable and influenced by seawater. Moreover, the ∑REE, Ga, and Th are enriched with the inorganic minerals and correlated with kaolinite. Ga and Th are also correlated with illite. Significant fractionation of REE is observed during the process of combustion.

scholarly journals Characteristics and geological significance of germanium in Taiyuan coal formation of Huainan Coalfield, Anhui, China

2020 ◽  
Vol 7 (4) ◽  
pp. 662-675
Author(s):  
Dun Wu ◽  
Wenyong Zhang ◽  
Guijian Liu ◽  
Run Zhan ◽  
Guangqing Hu
Keyword(s):  
Coal Seam ◽  
Inductively Coupled Plasma ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Terrestrial Plants ◽  
Plasma Atomic Emission Spectrometry ◽  
Coal Seams ◽  
Inductively Coupled ◽  
Average Value ◽  
Huainan Coalfield

AbstractHN-1# is the first fully working coring well of the Taiyuan Formation (Ty) in the Huinan Coalfield and exploration studies are currently underway on the associated resources of the coal-bearing strata. The HN-1# well is located in the Fufeng thrust nappe structural belt in the south of the Huainan Coalfield. Three coal samples from the Ty were collected from HN-1# and inductively-coupled plasma mass spectrometry and inductively-coupled plasma atomic emission spectrometry were used to determine the Ge content of each sample. Based on proximate and ultimate analyses, microscopy data, and analyses of the ash products, some important findings were made. The Ty coal samples had a relatively high total sulfur (St,d) content (4.24%), thus the coal was considered to be a lower ranked coal (high volatility bituminous coal), which also had a low coal ash composition index (k, 1.87). Collodetrinite was the main submaceral of the Ty coal. Small amounts of pyrite particles were found in the coal seams of the Ty, while the contents of pyrite and algae in the top and bottom sections of the coal seam were relatively high, which meant that the swampy peat conditions which existed during the formation of the coal seams were affected by seawater; also the degree of mineralization of the coal seam was relatively high, which is consistent with reducing conditions in a coastal environment setting. Atomic force microscopy (AFM) experiments showed that the modes of occurrence of Ge in the Ty coal were mainly those for organic-bound and adsorbed Ge species. The organic carbon isotope values for the Ty coal ranged from − 24.1‰ to − 23.8‰, with an average value of − 24.0‰, which is equivalent to the value for terrestrial plants (average value − 24.0‰). The Ge content of the Ty coal was 13.57 mg/kg. The Ge content was negatively correlated with volatile matter and the ash yield.

scholarly journals Mineralogical characteristics and sources of alkali metals in the No. 6 coal seam from the Fukang mining area of the Zhunnan coalfield, Xinjiang province, Northwest China

2019 ◽  
Vol 37 (3) ◽  
pp. 1162-1181 ◽  
Author(s):  
Yun Xu ◽  
Handong Liang ◽  
Ning Zhang
Keyword(s):  
Coal Seam ◽  
Inductively Coupled Plasma ◽  
Alkali Metals ◽  
Northwest China ◽  
Mining Area ◽  
Major Elements ◽  
Middle Part ◽  
X Ray ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry

Minerals in coal are of great significance in determining coal properties, washing, combustion, gasification, and liquefaction. The content of alkali metals in coal is an important factor determining corrosion and/or erosion in combustion boilers. Eleven coal samples were taken from the No. 6 coal seam of the Fukang mining area, Zhunnan coalfield, Xinjiang province, China. X-ray fluorescence, inductively coupled plasma-mass spectrometry, low-temperature ashing-X-ray diffraction, and electron probe microanalyzer were used for analyzing the minerals, major elements, and trace elements of the coal. The results indicated that the minerals mainly consist of dawsonite, dolomite, albite, calcite, kaolinite, quartz. The average content of Na2O in the ash of the No. 6 coal seam samples was 10.91%. Na mainly occurs in the form of organic compounds in the No. 6 coal seam, then in the form of inorganic minerals, such as dawsonite and albite. Na in surface and underlying strata was brought into the coal by water and combined with organic matter, resulting in relatively high Na contents in the upper and bottom parts of the coal seam and relatively low Na contents in the middle part.

Quantitative Cathodoluminescence Mapping with Application to a Kalgoorlie Scheelite

2009 ◽  
Vol 15 (3) ◽  
pp. 222-230 ◽  
Author(s):  
Colin M. MacRae ◽  
Nicholas C. Wilson ◽  
Joel Brugger
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Trace Element ◽  
Inductively Coupled Plasma ◽  
Trace Element Level ◽  
Gaussian Peak ◽  
X Ray ◽  
Element Abundances ◽  
Inductively Coupled ◽  
Peak Fitting

AbstractA method for the analysis of cathodoluminescence spectra is described that enables quantitative trace-element-level distributions to be mapped within minerals and materials. Cathodoluminescence intensities for a number of rare earth elements are determined by Gaussian peak fitting, and these intensities show positive correlation with independently measured concentrations down to parts per million levels. The ability to quantify cathodoluminescence spectra provides a powerful tool to determine both trace element abundances and charge state, while major elemental levels can be determined using more traditional X-ray spectrometry. To illustrate the approach, a scheelite from Kalgoorlie, Western Australia, is hyperspectrally mapped and the cathodoluminescence is calibrated against microanalyses collected using a laser ablation inductively coupled plasma mass spectrometer. Trace element maps show micron scale zoning for the rare earth elements Sm3+, Dy3+, Er3+, and Eu3+/Eu2+. The distribution of Eu2+/Eu3+ suggests that both valences of Eu have been preserved in the scheelite since its crystallization 1.63 billion years ago.

scholarly journals Electrochemical Removal of Rare Earth Element in LiCl-KCl Molten Salt

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Gha-Young Kim ◽  
Junhyuk Jang ◽  
Seungwoo Paek ◽  
Sung-Jai Lee
Keyword(s):  
Rare Earth ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Alloy Formation ◽  
X Ray ◽  
Inductively Coupled ◽  
Plasma Optical Emission Spectrometry ◽  
Re Elements ◽  
Electrochemical Removal

This study was carried out to examine the removal of rare earth (RE) elements by electrodeposition for the purification and reuse of LiCl-KCl salt after electrorefining and electrowinning. The electrochemical behavior of RE elements (Dy and Gd) in LiCl-KCl-DyCl3-GdCl3 at 500°C was investigated using the cyclic voltammetry (CV) technique using Mo and Mg electrodes. It was observed that the reduction potential of the RE elements shifted at the Mg electrode owing to the alloy formation with Mg (RE-Mg alloy). Subsequently, a series of potentiostatic electrolysis tests were conducted to remove the RE elements in the salt and check the formation of deposits at the Mg and Mo electrodes. The scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM/EDS) technique was used to confirm that the reduced RE metals were deposited on the surface of the Mg electrode. However, no significant deposit on the Mo electrode was observed, and a mud-like deposit was found on the bottom of the electrochemical cell. The salt analysis performed by employing the inductively coupled plasma-optical emission spectrometry (ICP-OES) indicated that the removal efficiency of Dy3+ and Gd3+ through electrodeposition was 83.5∼95.2 and 91.6∼95.2%, respectively.

scholarly journals KARAKTERISTIK DAN GENESA PENGAYAAN UNSUR-UNSUR TANAH JARANG PADA BATUBARA LAPANGAN BATUBARA MUARA TIGA BESAR UTARA, TANJUNG ENIM, CEKUNGAN SUMATERA SELATAN

2019 ◽  
Vol 14 (3) ◽  
pp. 198-212
Author(s):  
Ferian Anggara ◽  
Mutiara Cikasimi ◽  
Basuki Rahmat ◽  
Sigit Arso Wibisono ◽  
Rita Susilawati
Keyword(s):  
Rare Earth ◽  
Inductively Coupled Plasma ◽  
Emission Spectroscopy ◽  
Atomic Emission ◽  
X Ray Diffraction ◽  
Heavy Rare Earth ◽  
X Ray ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Heavy Rare Earth Elements

Batubara telah menjadi salah satu sumber alternatif unsur-unsur tanah jarang (UTJ) seiring dengan meningkatnya permintaan terhadap kebutuhan unsur-unsur tersebut. Kondisi geologis spesifik menyebabkan pengayaan konsentrasi UTJ pada batubara. Keterdapatan lapisan tipis material vulkanik (tonstein) pada Lapangan Batubara Muara Tiga Besar Utara, Formasi Muara Enim, Cekungan Sumatera Selatan menjadi salah satu indikasi terdapatnya pengayaan UTJ. Penelitian dilakukan menggunakan metode petrografi sayatan poles, analisis-analisis X-Ray Diffraction (XRD), proksimat, dan geokimia; Inductively Coupled Plasma-Mass/Atomic Emission Spectroscopy (ICP-MS/AES). Analisis geokimia menunjukkan pola distribusi UTJ didominasi oleh tipe UTJ Berat (Heavy Rare Earth Elements, HREE). Plot diagram nilai Coutl dan REOash menunjukkan prospek pengayaan UTJ termasuk ke dalam daerah prospek. Pola distribusi UTJ dan anomali redox sensitive dan redox non-sensitive menunjukkan tipe genetik pengayaan UTJ adalah tufaan. Pengayaan UTJ terjadi oleh proses pencucian alkaline tonstein yang terendapkan pada fase penggambutan dalam pembentukan batubara.

scholarly journals Synthesis, Structural and Optical Characterization of Titanium Dioxide Doped by (Ce, Yb) Dedicated to Photonic Conversion

2019 ◽  
Vol 20 (1) ◽  
pp. 175
Author(s):  
Zobair El Afia ◽  
Mohamed Youssef Messous ◽  
Mohamed Cherkaoui ◽  
Mounia Tahri
Keyword(s):  
Rare Earth ◽  
Inductively Coupled Plasma ◽  
High Energy ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Co Precipitation

The synthesis of TiO2 co-doped by (Ce, Yb) rare earth couple has been realized. This couple of rare earth can convert a high-energy photon to two low energy photons to enhance the energy efficiency of silicon solar cells. The undoped, 2% Ce doped- and (2% Ce, 4% Yb) Codoped- Titanium oxide were prepared by the co-precipitation method. The Infrared spectroscopy FTIR-ATR analysis indicates a continuous visible absorption in the 750–400 cm–1 region, confirming the formation of a titanium-oxygen bond. The X-Ray Diffraction characterization showed the dominance of the rutile crystalline phase with the presence of anatase one and the calculated crystallite size is between 7 to 13 nm. The X-Ray Fluorescence confirms the insertion of the dopants while the Inductively Coupled Plasma Mass Spectrometry ICP-MS showed the ratio 2 between Ce and Yb concentration. The thermogravimetric analysis indicated that Ce/Yb doped titanium was thermally stable. The absorption in the UV-visible (200 and 1000 nm) has been improved proportionally with the dopants.

scholarly journals Occurrence of rare earth element and yttrium (REY) in Tanjung formation coking coal from Sekako area, Central Kalimantan

2020 ◽  
Vol 200 ◽  
pp. 06008
Author(s):  
Hendra Amijaya ◽  
Beny Wiranata ◽  
Ferian Anggara
Keyword(s):  
Rare Earth ◽  
Coal Seam ◽  
Rare Earth Element ◽  
Inductively Coupled Plasma ◽  
Earth Element ◽  
Atomic Spectroscopy ◽  
Coking Coal ◽  
Central Kalimantan ◽  
Inductively Coupled ◽  
Point Of Interest

Inorganic geochemistry of coal become a point of interest on coal study, especially relating with the occurrence of rare earth element. Tanjung Formation is one of coking coal bearing deposits in Barito Basin, Central Kalimantan. The aims of this study to determine the occurrence of Rare Earth Element and Yttrium (REY) especially in term of concentration and enrichment type in coal seam A and B of Tanjung Formation in Sekako Area, Central Kalimantan. A number of 10 coal samples were collected from both seams. Inductively Coupled Plasma-Atomic Spectroscopy (ICP-AES) analysis was conducted to determine the REY in coal. Based on this study, coal seam A and B generally have very low concentration of REY elements deposits. The REY elements of coal seam A and B in the study area are typically characterized with M and H-type enrichment, which might be caused by the mafic basalt rocks in the surroundings.

scholarly journals Karakteristik Geokimia Basal Alkali Formasi Manamas di Sungai Bihati, Baun, Pulau Timor

EKSPLORIUM ◽  
2021 ◽  
Vol 42 (1) ◽  
pp. 1
Author(s):  
Angga Jati Widiatama ◽  
Lauti Dwita Santy ◽  
Happy Christin Natalia ◽  
Joko Wahyudiono ◽  
Rinaldi Ikhram
Keyword(s):  
Rare Earth ◽  
Igneous Rock ◽  
Inductively Coupled Plasma ◽  
Ocean Island Basalt ◽  
X Ray ◽  
Inductively Coupled ◽  
Icp Ms ◽  
Banda Arc ◽  
Mass Spectrometery ◽  
Island Basalt

ABSTRAK Batuan beku Formasi Manamas di Sungai Bihati, Baun merupakan salah satu singkapan batuan beku di Pulau Timor yang belum banyak diteliti berdasarkan karakter geokimia. Penelitian ini bertujuan untuk mengetahui genesa dan proses yang terjadi pada batuan beku Formasi Manamas dalam kerangka tektonik yang terjadi di Pulau Timor berdasarkan analisis petrografi dan geokimia. Analisis geokimia dilakukan dengan menggunakan X-ray Fluorescence (XRF) dan Inductively Coupled Plasma-mass Spectrometery (ICP-MS) untuk mengetahui senyawa utama, unsur jejak, dan unsur tanah jarang. Batuan beku Formasi Manamas berupa intrusi basal dengan afinitas alkali yang menunjukkan pola pengayaan unsur tanah jarang yang identik dengan Ocean Island Basalt (OIB). Penelitian ini membuktikan adanya dua mekanisme pengayaan unsur yang berbeda yaitu fluid related enrichment yang berkaitan dengan aktifitas subduksi lempeng Samudra Hindia di bawah Busur Banda dan melt related enrichment yang diperkirakan berasal dari sisa lempeng Samudra Hindia yang patah yang masuk kedalam zona reservoir OIB. Kedua magma lalu bercampur dan mengalami underplating di bawah Busur Banda. ABSTRACT The igneous rock of Manamas Formation in the Bihati River, Baun is one of the igneous rock outcrops in Timor Island that has not been widely studied based on its geochemical characteristic. This study aims to determine the genesis and processes that occur in the igneous rocks of the Manamas Formation within tectonic framework of Timor Island based on petrographic and geochemical analysis. X-ray Fluorescence (XRF) and Inductively Coupled Plasma-mass Spectrometery (ICP-MS) were used to determine the major elements, trace elements, and rare earth elements. The igneous rock of the Manamas Formation is a basalt intrusion with an alkaline affinity which shown an enrichment pattern of rare earth elements identical to Ocean Island Basalt (OIB). This study proves the existence of two different mechanisms of elemental enrichment, fluid related enrichment which related to the subduction activity of the Indian Ocean plate under the Banda Arc and also melt related enrichment which originated from the broken Indian Ocean plate which enters the OIB reservoir zone. The two different magmas then mix and underplating beneath the Banda Arc.

Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data

2010 ◽  
Vol 74 (4) ◽  
pp. 691-713 ◽  
Author(s):  
T. Graupner ◽  
F. Melcher ◽  
H.-E. Gäbler ◽  
M. Sitnikova ◽  
H. Brätz ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Inductively Coupled Plasma ◽  
Earth Element ◽  
Structural Data ◽  
Distribution Patterns ◽  
Rare Metal ◽  
Element Geochemistry ◽  
Inductively Coupled ◽  
Icp Ms

AbstractNew data on rare earth element (REE) concentrations and distribution patterns of columbite-tantalite minerals from Ta-ore provinces worldwide are presented. The REE geochemistry was studied by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Five major types of chondrite-normalized REE distribution patterns are defined for columbite-group minerals (CGM) from lithium-caesium-tantalum (LCT) pegmatites and rare-metal granites. Features to discriminate between the types include (1) the shape of the pattern (e.g. flat or concave), (2) calculated ratios between groups of the REE (e.g. heavy REEN/middle REEN), and (3) the presence and intensity of anomalies (e.g. Ce*, Eu*). Four pegmatites in central and southern Africa are used as case studies to discuss application of the types of REE patterns in individual deposits. The REE fractionation during progressive evolution of the melt in a pegmatite body (either Nb → Ta or Fe → Mn fractionation lines, or both) results in smaller heavy REEN/middle REEN ratios whereas replacement of primary CGM by secondary CGM produces modifications in the light REEN patterns and the heavy REEN/middle REEN ratios also. Critical features of REE patterns such as highly variable heavy REEN/middle REEN ratios or striking differences in the appearance of Eu anomalies are discussed considering structural data of the host minerals and the differentiation behaviour of the pegmatitic melt. In general, CGM from each individual Ta-ore province are characterized by a predominance of one type of REE distribution pattern. Consequently, these patterns are suitable for tracing the origin of tantalum ore concentrates (e.g. as a forensic tool).

Sign in / Sign up

Export Citation Format

Share Document