rare earth profile

A weathering profile on a uniform Lower Cretaceous volcanogenic sandstone from southern Victoria, Australia is enriched in rare-earth elements (REE), Y and other elements including Ba, Sr and Rb. Enrichments of REE of up to 7 times parent-rock values are associated with Fe-leached members of alteration couplets with little or no …

The aim of this study is to characterize the evolution of the rare earth elements (REE) in the Pingba red residua on karst terrain of Yunnan-Guizhou Plateau. The in-situ weathering and the two-stage development of the …

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The use of rare earth element profiles as a proxy for a fractionation source and mine-waste provenance. Author links open overlay panel Zdzisław M. Migaszewski ... s and locally rare earth elements (REE). The latter are of strategic significance, therefore, AMD waters containing >1000 μg/L REEs may be a potential source of these metals ...

Description. Operator of rare earth elements and metals refining company intended to transform the technical, economic, scale, and environmental challenges of refining. The company's rare earth concentrate processing technology allows for the full, one-pass refinement and separation of rare-earth elements (REE) materials, providing …

To investigate the mobility of elements during extreme weathering of basalts, major and trace elements concentrations along with the mineralogical abundance of weathered products, are reported for lateritic profiles developed over the ~118.1 ± 0.3 Ma old Rajmahal Trap basalts in Eastern India. Special emphasis has been given to studying …

The rare earth elements (REE) are a set of seventeen metallic elements. These include the fifteen lanthanides on the periodic table plus scandium and yttrium. Rare earth elements are an essential part of many high …

Based on rate equations, a theoretical model of a fiber oscillator with a multimode gain fiber was built. We studied the effect of the rare earth doping profile in the core on the output characteristics of the multimode fiber oscillator. The results indicated that a pure fundamental mode can be obtained by partly doping the core of the large mode …

Abstract. In this study, rare earth element (REE) distribution has been investigated in a weathering profile from central Madagascar. Combination of bulk rock geochemical data (elements and isotopes) with mineral characterization reveals a remarkable evolution of the REE abundances and REE-minerals in the vertical …

Citations: 74. PDF. Tools. Share. Summary. The rare earth elements (REE) are soft, silver-coloured metals that tarnish quickly in air and have high melting points. …

Rare earth elements (REEs) includes a group of 17 metals: scandium (Sc), yttrium (Y) and the 15 lanthanoid elements lanthanum (La), cerium (Ce), ... Solid speciation and fractionation of rare earth elements in a spodosol profile from northern Sweden as revealed by sequential extraction. Chem. Geol., 160 (1999), pp. 121-138.

The unique properties of rare earth elements (REEs) (Fig. 2.1) make them useful in a wide variety of applications, such as alloys, batteries, catalysts, magnets, phosphors, and polishing compounds.The REEs and their primary uses by manufacturing sector are covered in Table 2.1.Four main geologic types of REE resources supply REEs …

Rare earth elements (REEs) have several applications but the effects on environment are not well known. Therefore, the aim of this work is to establish a method for direct solid sample analysis by laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS) to evaluate the concentration and distribution of REEs in …

Summary. The rare earth elements (REE) are soft, silver-coloured metals that tarnish quickly in air and have high melting points. The REE range in abundance in the crust from about the same level as copper and lead down to the same levels as bismuth. There are many potential REE ore deposits in a wide variety of rocks.

Hunan Rare Earth Co., Ltd. is a worldwide supplier of rare earth materials used in a wide range of technology applications across many sectors. With a team of professionals of extensive expertise and successful track records in rare earth industry, the company specializes in the production of rare earth custom alloys and high purity metals. The ...

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Rare earth elements are a group of seventeen chemical elements that occur together in the periodic table (see image). The group consists of yttrium and the 15 lanthanide elements …

The rare earth element (REE) contents of soils were determined to study the behaviour of REE in the weathering profile. The bedrock for the soils was the Karkonosze granite.

1. Introduction. The isotopic composition of the rare earth element Nd in seawater is a GEOTRACES key parameter because it is frequently applied as a chemical tracer of present and past ocean circulation (e.g., Piepgras and Wasserburg, 1980, Frank, 2002, Piotrowski et al., 2005, Pena and Goldstein, 2014).It is clear that the source of rare …

146 Citations. 62 Altmetric. Metrics. Abstract. Global resources of heavy Rare Earth Elements (REE) are dominantly sourced from Chinese regolith-hosted ion …

The rare-earth elements ( REE) are a group of 17 elements on the periodic table, consisting of the lanthanoid series, and scandium and yttrium. While some REEs are not particularly rare in terms of average abundance in the Earth's crust, they are seldom found in concentrations high enough for economic extraction, and global annual production ...

The rare earth elements (REEs) are the 14 lanthanide elements that share similar chemical properties by virtue of a similar valence electron configuration, but whose relative abundances are …

Rare earth elements (REE) include the lanthanide series elements (La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) plus Sc and Y. Currently these …

a Schematic regolith profile indicating leaching in the top of the weathering profile (pedolith) and accumulation of rare earth elements (REEs) in the saprolite, in which REEs are inferred to be ...

The content of rare earth elements in the granite weathering profile is mainly controlled by the parent rock, and the variation depends on the difference in the weathering resistance of minerals ...

Rare earth elements (REEs) are widely used in industry and the entry of REEs into the pedosphere is assumed. Data about REEs in soils are scarce since only a few studies discuss their ecologically relevant behavior. Hence, we investigated total contents (aqua regia digestion) and potentially bioavailable contents (EDTA extraction) of REEs in …

Rare earth metal ions are known to affect the infusion of Ca(II) ions into cells and are thus thought of as candidate agents with potential influence in pathophysiological biological processes [67]. This fundamental aspect provides a) support for specific justification of both natural flavonoids and lanthanide metal ions intertwined into a ...

Behavior of rare earth elements (REE) during weathering and their distribution within weathered profiles have been investigated extensively. Weathering conditions and the stability of primary REE-bearing minerals have been identified as two foremost important factors controlling REE mobility (e.g. Aubert et al., 2001). However, in …

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The Southeastern United States contains numerous granites of the type that contain high concentrations of rare earth elements. We are conducting studies of these …

In this time of increased focus on renewable energy technologies, rare earth elements (REEs) are of critical importance. For example, neodymium (Nd) is a REE used in the generator and motor magnets of wind turbines and electric vehicles. Reliance on REE imports puts the U.S. at high risk for supply disruption.

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The composition and concentration of rare earth elements (REEs) in soil are primarily dependent on the lithology of parent materials. The different association preferences among individual REE and soil solid phases also cause REEs fractionation during pedogenetic processes. ... Rare earth elements in soil profiles of various …

Statistics and information on the worldwide supply of, demand for, and flow of the mineral commodity group rare earths - scandium, yttrium, and the lanthanides. The principal economic sources of rare earths are the minerals bastnasite, monazite, and loparite …

Exploring the distributions of rare earth elements (REEs) in soil profiles is essential to understanding how natural and anthropogenic factors influence the geochemical behaviors of REEs.

The rare earth element (REE) contents of soils were determined to study the behaviour of REE in the weathering profile. The bedrock for the soils was the Karkonosze granite. A five-step extraction scheme was conducted on six soil profiles in order to determine the ability of REE to be released to the environment. Sequential extraction indicated that the REE …

The presented study aimed to extend the knowledge of toxicological profile of rare earth elements salts (REEs). The basal toxicity test performed comprised assessment of cytotoxicity (3T3 Balb/c ...

Rare earth elements (REEs) are a group of elements with similar physical and chemical characteristics, belonging to the lanthanide series and yttrium (Y). Nevertheless, the geochemical behavior of REEs differs between individual REEs or subgroups of REEs due to differences in their atomic mass, ionic radius, and …

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