Characterization of reused U–10Zr heel residue containing rare-earth elements through surface treatment

2018 ◽  
Vol 316 (3) ◽  
pp. 1157-1163 ◽  
Author(s):  
Seong-Jun Ha ◽  
Ki-Hwan Kim ◽  
Jeong-Yong Park ◽  
Sun-Ig Hong
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Surface Treatment

Geographical Characterization of Greek Olive Oils Using Rare Earth Elements Content and Supervised Chemometric Techniques

2012 ◽  
Vol 45 (8) ◽  
pp. 920-932 ◽  
Author(s):  
Eleni G. Farmaki ◽  
Nikolaos S. Thomaidis ◽  
Katerina S. Minioti ◽  
Evaggelia Ioannou ◽  
Constantinos A. Georgiou ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Olive Oils ◽  
Chemometric Techniques

scholarly journals Pemantapan Proses Sintesis Ligan Dibutilditiokarbamat (DBDTK) Sebagai Pengekstrak Logam Tanah Jarang Berdasarkan Desain Eksperimen

2018 ◽  
Vol 14 (1) ◽  
pp. 195
Author(s):  
Diana Hendrati ◽  
Erianti Siska Purnamasari ◽  
Syulastri Effendi ◽  
Santhy Wyantuti
Keyword(s):  
Rare Earth ◽  
Experimental Design ◽  
Rare Earth Elements ◽  
Contrast Agent ◽  
Design Of Experiment ◽  
Large Scale ◽  
Carbon Disulphide ◽  
Raw Material ◽  
Ligand Synthesis

<p>Gadolinium (Gd) merupakan salah satu logam tanah jarang, dimana logam tanah jarang dapat diekstrak dari mineral salah satunya mineral monasit. Logam Gd biasanya digunakan sebagai bahan dasar <em>contrast agent</em> dalam dunia kesehatan. Ligan dibutilditiokarbamat mampu membentuk senyawa kompleks dengan cara mengikat logam sehingga membentuk khelat yang dapat digunakan untuk ekstraksi. Tujuan dari penelitian ini adalah memantapkan sintesis ligan dibutilditiokarbamat berdasarkan desain eksperimen dan karakterisasi kompleks antara Gd(III) dengan ligan dibutilditiokarbamat hasil sintesis. Penelitian ini diawali dengan pembuatan desain eksperimen untuk sintesis ligan dan ekstraksi Gd(III) dengan ligan, kemudian proses sintesis dan ekstraksi dilakukan sesuai dengan desain eksperimen, hasil sintesis dan ekstraksi dikarakterisasi menggunakan metode spektroskopi serta diuji kelarutannya dalam pelarut organik. Data yang diperoleh menunjukkan bahwa sintesis ligan dibutilditiokarbamat optimal pada suhu 4 °C, perbandingan dibutilamin dan karbondisulfida yaitu 1 : 3 dengan perbandingan mol ammonia terhadap dibutilamin yaitu 1 : 4, sedangkan kondisi optimal untuk ekstraksi Gd(III) dengan ligan yaitu pada pH 6, dengan perbandingan mol Gd(III) dan ligan yaitu 1 : 4 dan lama ekstraksi 60 menit. Oleh karena itu ligan dibutilditiokarbamat hasil sintesis berpotensi digunakan sebagai ekstraktan untuk ekstraksi Gd(III). Hasil prediksi ligan berdasarkan desain eksperimen yaitu sebesar 56,12% sedangkan prediksi ekstraksi Gd(III) dengan ligan hasil sintesis diperoleh sebesar 78,41%. Kesimpulan dari penelitian ini bahwa sintesis ligan dibutilditiokarbamat  berdasarkan desain eksperimen dapat dikembangkan untuk sintesis skala besar.</p><p>Gadolinium (Gd) is one of the rare-earth elements, whereas rare-earth elements can be extracted from monazite. Gd is usually used as raw material for synthesizing contrast agent<em> </em>in medicine field. Dibuthyldithiocarbamate ligand can form a complex compound with metal. This ligand will bind a metal and then forming chelate which is used for extraction. The purpose of this research is to ensure procedure of dibuthyldithiocarbamate ligand synthesis based on the design of experiment and to study the characterization of reaction result between Gd(III) and dibuthyldithiocarbamate ligand which this ligand is synthesis result. This research begins with making design of experiment for ligand synthesis and Gd(III) extraction with ligand, then perform the process of synthesis and extraction according to the design of experiment, the result of synthesis and extraction were characterized by spectroscopy method and solubility tested in organic solvent. The data was collected indicate that the optimal condition of dibuthyldithiocarbamate ligan synthesis at 4 °C (temperature), the ratio of di-n-butylamine and carbon disulphide is 1:3 with the mole ratio of ammonia to the di-n-butylamine 1:4, while the optimal conditions for gadolinium extraction with ligand at pH 6, the mol ratio of gadolinium and ligand is 1:4 and 60 minutes extraction time. Hence, dibuthyldithiocarbamate ligand can be used as extractan for extracting Gd(III). The prediction of ligand based on the experimental design is 56.12% while the prediction of Gd(III) extraction with ligand of the synthesis result is obtained equal to 78.41%. The conclusion of this research is that the synthesis of dibuthyldithiocarbamate ligand based on the experimental design can be developed for large-scale synthesis.</p>

scholarly journals Synthesis and characterization of magnetic mesoporous Fe3O4@mSiO2–DODGA nanoparticles for adsorption of 16 rare earth elements

RSC Advances ◽  
2018 ◽  
Vol 8 (68) ◽  
pp. 39149-39161 ◽  
Author(s):  
Jingrui Li ◽  
Aijun Gong ◽  
Fukai Li ◽  
Lina Qiu ◽  
Weiwei Zhang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
High Selectivity ◽  
Synthesis And Characterization

The high selectivity magnetic mesoporous Fe3O4@mSiO2–DODGA nanomaterials were prepared for adsorption of 16 rare earth elements.

scholarly journals Garnets from Val d’Ala Rodingites, Piedmont, Italy: An Investigation of Their Gemological, Spectroscopic and Crystal Chemical Properties

Minerals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 728 ◽  
Author(s):  
Valeria Diella ◽  
Rosangela Bocchio ◽  
Nicoletta Marinoni ◽  
Franca Caucia ◽  
Maria Iole Spalla ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Inductively Coupled Plasma ◽  
Chemical Properties ◽  
Western Alps ◽  
Drift Spectroscopy ◽  
X Ray ◽  
Heavy Rare Earth Elements ◽  
Diffuse Reflectance Infrared

In Val d’Ala (Piedmont, Western Alps, Italy), the more interesting rocks for the mineralogical research are represented by rodingites (rich in mineralized veins and fractures) associated with serpentinites in the eclogitized oceanic crust of Piemonte Zone, south of Gran Paradiso Massif. Among the vein-filling minerals, garnets are the most appreciated as mineral specimens and, in less degree despite their vivid and rich colors, for their potential as gem-quality materials. This study provides a complete gemological characterization of five faceted samples and offers new information by means of Synchrotron X-ray computed micro-tomography imaging gem features. Electron-probe microanalysis (EMPA) and laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) established that the chemical composition of garnets from different localities, resulted both close to pure andradite, enriched in light rare earth elements (LREE) with a positive Eu anomaly, and grossular-andradite solid solution (grandite), enriched in heavy rare earth elements (HREE). X-ray powder diffraction analyses indicate the possible coexistence of almost pure grossular and andradite. A spectroscopic approach, commonly used with gem-like material, by Raman and diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, completes the characterization of the samples. The new data on the textural and geochemical features of the grandite and andradite garnets suggest local growth processes under various chemical and oxidation conditions of metasomatic and metamorphic fluids interacting with the host-rocks. Garnets represent long-lasting mineral records of the complex geological history of the Val d’Ala rodingitic dikes during their oceanic- and subduction-related metamorphic evolution.

Use of rare earth elements and internal transition elements for characterization of the depositional paleo environment in samples of the experience of the Pimenteiras Formation, Parnaíba Basin, Brazil

2021 ◽  
Vol 106 ◽  
pp. 103104
Author(s):  
Rui Jesus Lorenzo Garcia ◽  
Jucelino Balbino da Silva Júnior ◽  
Ilene Matanó Abreu ◽  
José Roberto Cerqueira ◽  
Eliane Soares de Souza ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Transition Elements ◽  
Internal Transition ◽  
Parnaíba Basin
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