scholarly journals Recovering rare earth elements from phosphogypsum using a resin-in-leach process: Selection of resin, leaching agent, and eluent

2019 ◽  
Vol 189 ◽  
pp. 105125 ◽  
Author(s):  
Sami Virolainen ◽  
Eveliina Repo ◽  
Tuomo Sainio
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Process Selection ◽  
Selection Of

Empirical Cases

2021 ◽  
pp. 81-93
Author(s):  
Stephen E. Gent ◽  
Mark J. C. Crescenzi
Keyword(s):  
Foreign Policy ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Market Power ◽  
Commodity Markets ◽  
Power Politics ◽  
Territorial Expansion ◽  
Significant Control ◽  
Gas Market ◽  
Selection Of

This chapter discusses the selection of the case studies for the book: Iraq and the oil market, Russia and the natural gas market, and China and the rare earth elements market. These cases provide useful plausibility probes for the authors’ theory of market power politics. First, these cases involve competition in key commodity markets in which states could potentially have the opportunity and willingness to pursue a market power opportunity though territorial expansion. Second, since these states have had significant control over their firms in these commodity markets, one can isolate the mechanism by which market power motivations influence foreign policy decisions. Finally, these cases include incidents of both violence and strategic delay, which provides variation on the dependent variable.

Screening and selection of technologically applicable microorganisms for recovery of rare earth elements from fluorescent powder

2018 ◽  
Vol 79 ◽  
pp. 554-563 ◽  
Author(s):  
Stefanie Hopfe ◽  
Silke Konsulke ◽  
Robert Barthen ◽  
Falk Lehmann ◽  
Sabine Kutschke ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Fluorescent Powder ◽  
Selection Of

Use of X-ray Fluorescence Analysis for the Determination of Rare Earth Elements

2016 ◽  
Vol 1 (9) ◽  
Author(s):  
Rainer Schramm
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Fluorescence Analysis ◽  
Solid Material ◽  
Spectral Lines ◽  
Energy Dispersive ◽  
X Ray ◽  
Reference Samples ◽  
Selection Of

AbstractX-ray fluorescence spectrometry (XRF) is a powerful tool for the analysis of solid material. That is the reason why the technique was applied for the determination of rare earth elements (REEs) since about 1970. At present, energy-dispersive XRF and wavelength-dispersive XRF are used for the analysis of pressed powder pellets or fused Li-borate beads containing REEs. The production of reliable results can only be achieved by careful optimization of the parameter, in particular the selection of spectral lines. The quantification is based on a calibration realized by using reference samples.

Flame spectra of the rare-earth elements*

1962 ◽  
Vol 18 (4) ◽  
pp. 1127-1153
Author(s):  
V FASSEL ◽  
R CURRY ◽  
R KNISELEY
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
The Rare Earth

ESTIMATION OF THE ABUNDANCE AND DISTRIBUTION OF RARE EARTH ELEMENTS IN SOIL AROUND KADUNA REFINING AND PETROCHEMICAL COMPANY USING NUCLEAR TECHNIQUE

2020 ◽  
Vol 4 (2) ◽  
pp. 599-604
Author(s):  
Michael A. Onoja ◽  
P. H. Bukar ◽  
C. U. Omeje ◽  
A. M. Adamu
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Nuclear Technique ◽  
Flood Plains ◽  
Economic Exploitation ◽  
Rare Elements ◽  
Petrochemical Company ◽  
The Moment ◽  
Abundance And Distribution ◽  
Natural Pattern

Instrumental neutron activation analysis (INAA) technique was used to investigate the abundance and distribution of rare earth elements (REE) in soil around Kaduna Refinery. The aim of the study is to assess the rare elements potential of Nigeria for economic exploitation. Five REEs (La, Dy, Eu, Yb, and Lu) were detected in varying concentrations ranging from a minimum of 0.6 µg/g (Lu) to a maximum of 249.0 µg/g (La). The elements existed with trends consistent with the natural pattern of REEs in soil, showing significant Eu and Dy anomalies which characterize upper plains and flood plains. The levels of REEs in soil in the study area were generally slightly above background levels, with minimal (La, Dy, and Eu), moderate (Yb), and significant (Lu) enrichments and trending: Lu ˃Yb ˃ Eu ˃ Dy ˃ La. The abundance of the REEs investigated cannot establish a potential of Nigeria for economic exploitation of the mineral, hence, rare earth project in the study area is not viable at the moment.

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