scholarly journals KARAKTERISASI MINERAL IKUTAN TIMAH PADA ENDAPAN PRIMER, SEKUNDER, DAN TAILING DI BANGKA SELATAN DAN BELITUNG

2020 ◽  
Vol 1 (1) ◽  
pp. 807-816
Author(s):  
Syafrizal Syafrizal ◽  
Ahmad FauSatyogroho Dian Amerthozi ◽  
Ichwan Azward ◽  
Teti Indriati ◽  
Amrita Oza Nabilla ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
New Technologies ◽  
Economic Value ◽  
Xrd Analysis ◽  
Sample Volume ◽  
X Ray Diffraction ◽  
Grab Sampling ◽  
X Ray ◽  
Tin Metal

ABSTRAK Daerah Bangka Belitung termasuk dalam sabuk timah yang merupakan intrusi pluton granit. Selain merupakan pembawa logam timah, diketahui bahwa pada batuan granit juga merupakan batuan beku pembawa mineral-mineral Rare Earth Elements (REE) seperti monasit, dan xenotim. REE memiliki nilai ekonomis yang tinggi dan peran penting dalam perkembangan teknologi baru. Penelitian ini bertujuan untuk mengetahui kelimpahan kadar, mineralogi dan ukuran butir Mineral Ikutan Timah (MIT) pada endapan primer, sekunder, dan tailing di Bangka Selatan dan Belitung. Pengambilan sampel dilakukan secara acak (grab sampling) untuk sampel endapan aluvial, koluvial, tailing, serta konsentrat dan chip sampling untuk sampel endapan primer berbentuk batuan. Sampel dikeringkan menggunakan oven, kemudian direduksi menggunakan splitter hingga memperoleh volume sampel yang sesuai. Pengayakan sampel dilakukan menggunakan 5 (lima) fraksi yaitu #+48, #+65, #+100, #+150, dan #-150 untuk memperoleh keseragaman butir sampel. Metoda analisis yang digunakan dalam penelitian ini adalah analisa radioaktif menggunakan scintillometer, mineral butir menggunakan metode grain counting, analisa mineragrafi dengan sayatan poles, serta analisa X-Ray Diffraction (XRD) berupa sampel bubuk. Kata kunci : Mineral Ikutan Timah,  Rare Earth Elements, Grain Counting, Monasit, Xenotim.   ABSTRACT The Bangka Belitung area is included in a tin belt which is an intrusion of granite pluton. Besides being a tin metal carrier, it is known that in granite rocks is also igneous rock carrying minerals Rare Earth Elements (REE) such as monasite, and xenotime. REE has high economic value and an important role in the development of new technologies. This study aims to determine the radioactive value, abundance of levels, mineralogy and size of associated tin minerals in primary, secondary and tailings deposits in South Bangka and Belitung. Sampling was carried out by grab sampling for alluvial, colluvial, tailing sediment samples, as well as concentrates and sampling chips for rock sediments. Sampling method by Random Sampling. The samples were dried using an oven, then reduced using a splitter to obtain the appropriate sample volume. Sifting the sample was carried out using 5 fractions namely #+48, #+65, #+100, #+150, and #-150 to obtain uniformity of sample items. Radioactive analysis using scintillometers, grain minerals using the grain counting method, mineragraphy analysis with polish incisions, and X-Ray Diffraction (XRD) analysis in the form of powder samples.  Kata kunci : Mineral Ikutan Timah,  Rare Earth Elements, Grain Counting, Monasit, Xenotim.

Structure Maps and Phase Stability in AlTi3 Alloyed with Rare-Earth Elements

1988 ◽  
Vol 133 ◽  
Author(s):  
C. T. Liu ◽  
J. A. Horton ◽  
D. G. Petitifor
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Solubility Limit ◽  
Size Factor ◽  
X Ray Diffraction ◽  
Atomic Size ◽  
X Ray ◽  
Dependent Parameter ◽  
Rare Earth Additions

ABSTRACTRare-earth elements including Y, Er and Sc were added to AlTi3 for stabilizing the Ll2 ordered crystal structure, as predicted by the AB3 structure map. The crystal structure and phase composition in the AlTi3 alloys were studied by electron microprobe analysis, X-ray diffraction and TEM. The solubility limit of the rare-earth elements were determined and correlated with the atomic size factor. The results obtained so far indicate that rare-earth additions are unable to change the crystal structure of AlTi3 from DO19 to Ll2. The inability to stabilize the Ll2 structure demonstrates the need to characterize the structure map domains with a further period-dependent parameter.

scholarly journals Identification of rare-earth minerals associated to K-feldspar: Capacsaya project in Peru

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
J. Ochoa ◽  
E. Monteblanco ◽  
L. Cerpa ◽  
A. Gutarra-Espinoza ◽  
L. Avilés-Félix
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Size Range ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Particle Size Range ◽  
X Ray ◽  
Rare Earth Minerals ◽  
Heavy Rare Earth Elements ◽  
The Rare Earth

AbstractA recently discovered the rare-earth-rich site in Capacsaya, located at 123 km northwest of Cusco, at the south of Peru, contains significant quantities of light and heavy rare-earth elements such as neodymium, lanthanum, cerium, europium, and yttrium. This work reports the identification of rare-earth elements and their associated minerals using scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction analyses. Five (5) samples extracted from different locations at the Capacsaya site were characterized and identified K-feldspar as the mineral associated with the rare-earth elements in a representative sample with a high concentration of lanthanum and cerium. The results showed rare-earth elements contained within the mineral phase monazite, being cerium the dominant element in the phase (La, Ce, Nd)PO$$_4$$ 4 . Finally, through the electrostatic separation process we demonstrate that it was possible to achieve an efficient separation of the K-feldspar phase in the particle size range 75–150 $$\upmu$$ μ m.

Plumbogummite-group minerals from Mull and Morvern

1970 ◽  
Vol 37 (292) ◽  
pp. 934-938 ◽  
Author(s):  
D. C. Bain
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Clay Minerals ◽  
Spectrochemical Analysis ◽  
X Ray Diffraction ◽  
Complex Composition ◽  
X Ray

SummarySandstones from Mull and Morvern, most of which are from the Greensand formation, have been shown by X-ray diffraction to contain minerals of the plumbogummite group in very small amounts in the < 1·4µm fraction. The minerals were concentrated by HF digestion of the clay minerals. X-ray spectrographic traces show concentrations of Sr, La, Ce, Yt, and Ba, and a semiquantitative spectrochemical analysis also shows a concentration of Ca and Pb and the presence of numerous rare-earth elements. Individual minerals, which have a complex composition and can not be assigned to any one named species, are disseminated throughout the rocks as particles with an estimated size of between 0·1 and 0·25µm.

Crystal structures of rare earth elements rich apatite analogues

1990 ◽  
Vol 191 (3-4) ◽  
Author(s):  
Nicoline Kalsbeek ◽  
Sine Larsen ◽  
Jørn G. Rønsbo
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Crystal Structures ◽  
X Ray Diffraction ◽  
Hexagonal System ◽  
Space Group ◽  
X Ray ◽  
Cell Dimensions

AbstractThe crystal structures have been determined for britholite-(Ce) and lessingite-(Ce) from the type localities and a third sample (‘min X’) showing chemical similarities to both britholite-(Ce) and lessingite-(Ce). This sample is from the Ilímaussaq intrusion in Greenland. They are rare earth elements (REE) rich apatite analogues. Based on the X-ray diffraction results they were assigned to the hexagonal system with cell dimensions slightly larger than those of apatite. The three structures have been refined in the space group

scholarly journals Investigation of the Structural and Magnetic Properties of the Light Rare Earth Elements and Their Intermetallic Compounds

1988 ◽  
Vol 41 (2) ◽  
pp. 155 ◽  
Author(s):  
DC Creagh
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Intermetallic Compounds ◽  
Light Rare Earth ◽  
X Ray Diffraction ◽  
X Ray ◽  
Radiation Sources ◽  
Structural And Magnetic Properties ◽  
Light Rare Earth Elements

The experimental requirements for the investigation of the structural and magnetic properties of the light rare earth elements and their intermetallic compounds at synchrotron radiation sources are discussed. Experimental techniques considered include X-ray topography, energy dispersive X-ray diffraction and X-ray powder diffraction.

scholarly journals Zr-Rich Eudialyte from the Lovozero Peralkaline Massif, Kola Peninsula, Russia

Minerals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 982
Author(s):  
Taras L. Panikorovskii ◽  
Julia A. Mikhailova ◽  
Yakov A. Pakhomovsky ◽  
Ayya V. Bazai ◽  
Sergey M. Aksenov ◽  
...  
Keyword(s):  
Rare Earth ◽  
Chemical Composition ◽  
Rare Earth Elements ◽  
Single Crystal ◽  
Kola Peninsula ◽  
Marginal Zone ◽  
X Ray Diffraction ◽  
Eudialyte Group ◽  
X Ray ◽  
Marginal Zones

The Lovozero peralkaline massif (Kola Peninsula, Russia) has several deposits of Zr, Nb, Ta and rare earth elements (REE) associated with eudialyte-group minerals (EGM). Eudialyte from the Alluaiv Mt. often forms zonal grains with central parts enriched in Zr (more than 3 apfu) and marginal zones enriched in REEs. The detailed study of the chemical composition (294 microprobe analyses) of EGMs from the drill cores of the Mt. Alluaiv-Mt. Kedykvyrpakhk deposits reveal more than 70% Zr-enriched samples. Single-crystal X-ray diffraction (XRD) was performed separately for the Zr-rich (4.17 Zr apfu) core and the REE-rich (0.54 REE apfu) marginal zone. It was found that extra Zr incorporates into the octahedral M1A site, where it replaces Ca, leading to the symmetry lowering from R3¯m to R32. We demonstrated that the incorporation of extra Zr into EGMs makes the calculation of the eudialyte formula on the basis of Si + Al + Zr + Ti + Hf + Nb + Ta + W = 29 apfu inappropriate.

Effect of Rare Earth Doping on Electrochemical Properties of Fe2O3 Nanoparticle for Supercapacitor

2018 ◽  
Vol 281 ◽  
pp. 743-747
Author(s):  
Wei Kang Yan ◽  
Jian Qiang Bi ◽  
Wei Li Wang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Constant Current ◽  
Rare Earth Doping ◽  
X Ray Diffraction ◽  
Super Capacitor ◽  
X Ray ◽  
Constant Current Charge ◽  
Discharge Method ◽  
Structure And Microstructure

Fe2O3 nanoparticle was prepared by a hydrothermal method, and the influence of rare earth elements (Y3+, Nd3+ and La3+) on the electrochemical performance was studied. The crystal structure and microstructure of the synthesized lithium zinc ferrite were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM). The results show that the powder is well crystallized and the particles are mostly irregular.The electrochemical property was characterized via cyclic voltammetry (CV) and constant current charge-discharge method. The capacitance of the Fe2O3 nanoparticle is 258.3 F/g, 342.7 F/g after doping Y3+ ,337.1 F/g after doping Nd3+and 331.2 F/g after doping La3 +. The results show that the rare earth elements (Y3+, Nd3+ and La3+) after the specific capacitance has increased, more suitable for super capacitor materials.

scholarly journals Characterization of Rare Earth Elements in Tailing of Ex-Tin Mining Sands from Singkep Island, Indonesia

2018 ◽  
Vol 7 (2) ◽  
pp. 131-137 ◽  
Author(s):  
Yanuar Hamzah ◽  
Muhammad Mardhiansyah ◽  
Liong Nyuk Firdaus
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Rapid Determination ◽  
Mining Area ◽  
Economic Potential ◽  
Energy Dispersive Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

The objective of this research is to determine the rare earth elements (REEs) from themonazite minerals content of several tin tailing sands (TTS)of ex-tin mining area in Kuala Raya Singkep Island, Indonesia. We used the energy dispersive analysis of  X-ray (EDAX)-scanning electron microscopy (SEM) and x-ray diffraction (XRD) to characterize the contents of the samples. The coupled analytical of XRD with SEM/EDX approach enabled to be used for mineralogical identification on the heavy mineral as a rapid determination approach. The analysis of the samples indicates only the presence of REEs including lanthanum (La), cerium (Ce), and thorium (Th) are consistent with the identification of monazite and minerals in the tailing sand. The results show that the average REEs consist of La at 0.2 .%, Ce at 7.8 %, and Th at 2.0% respectively. It is concluded that monazite minerals in TTS has an economic potential to be developed. These monazite minerals can be used as material for semiconductor devices.   

scholarly journals Al-Si-Re Alloys Cast by the Rapid Solidification Process / Stopy Al-Si-Re Odlewane Metodą Rapid Solidification

2015 ◽  
Vol 60 (4) ◽  
pp. 3057-3062
Author(s):  
M. Szymanek ◽  
B. Augustyn ◽  
D. Kapinos ◽  
J. Żelechowski ◽  
M. Bigaj
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Rapid Solidification ◽  
Structure Refinement ◽  
Diffraction Method ◽  
Solidification Process ◽  
Thin Strip ◽  
X Ray Diffraction ◽  
X Ray ◽  
Casting Technique

The aim of the studies described in this article was to present the effect of rare earth elements on aluminium alloys produced by an unconventional casting technique. The article gives characteristics of the thin strip of Al-Si-RE alloy produced by Rapid Solidification (RS). The effect of rare earth elements on structure refinement, i.e. on the size of near-eutectic crystallites in an aluminium-silicon alloy, was discussed. To determine the size of crystallites, the Scherrer X-ray diffraction method was used. The results presented capture relationships showing the effect of variable casting parameters and chemical composition on microstructure of the examined alloys. Rapid Solidification applied to Al-Si alloys with the addition of mischmetal (Ce, La, Ne, Pr) refines their structure.

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