rare earth naturally

Precious metals are rare, naturally occurring metals metallic chemical elements of high economic value. The most common of these are Gold, silver, platinum, and palladium. All are refined at elevated temperatures and cast into ingots for future use. The rare-earth elements, also called the rare-earth metals or rare-earth oxides, are a set of 17 ...

Rare-earth oxides could provide more robust coating materials because their electron configuration makes them intrinsically hydrophobic, report researchers at Massachusetts Institute of Technology ...

Among them, Promethium (Pm) is the only rare earth element, which does not occur naturally (De Lima and Leal Filho, 2015). Due to the similar geochemical behavior of Y and Sc to the lanthanides (Sc only in aqueous medium), they are also considered as REEs ( McLennan and Taylor, 2012, Voncken, 2016 ).

Rare earth elements (REEs) are considered environmental pollutants that have received extensive attention recently. The accumulation of REEs in plants is important because REEs can eventually enter the human body via the food chain. Marigolds are widely utilized as medicinal and commercial plants in medicine, feed, and therapeutics. …

Extraction and Separation of Some Naturally Occurring Radionuclides from Rare Earth Elements by Different Amines E. H. Borai* a, A .M. Shahr El-Din a, E .A. EL-Sofany a, A. A. Sakr a, G. O. El ...

Phytolacca americana L. is a herbaceous plant widely distributed in Dingnan county of Jiangxi province, China, which is a REE mining region (ion absorption rare earth mine) and the soil has high levels of REEs. An investigation of REE content of P. americana growing naturally in Dingnan county was conducted.

In this paper, the behavior of rare earth elements (REE) in a watershed impacted by acid-mine drainage (Fisher Creek, Montana) is compared to that in a volcanically acidified watershed (Rio Agrio and Lake Caviahue, Argentina). The REE behave conservatively in acidic waters with pH values less than approximately 5.5. …

Rare earth elements (REEs) are considered environmental pollutants that have received extensive attention recently. ... Accumulation and distribution characteristics of rare earth elements (REEs) in the naturally grown marigold (Tagetes erecta L.) from the soil Environ Sci Pollut Res Int. 2023 Jan 31. doi: 10.1007/s11356-023-25508-5. Online ...

A rare earth element (REE) hyperaccumulator, Dicranopteris dichotoma, sampled from an REE mining area in South-Jiangxi region, was chosen for analysis of 15 REEs at subcellular and molecular levels by inductively coupled plasma-mass spectrometry (ICP-MS).The sum of the concentrations of 15 REEs (∑REEs) of D. dichotoma leaf was …

The use of rare earths and yttrium (REY) in high-technology products is accompanied by their increasing release into the environment. Concerns regarding the (eco-)toxicity and bioaccumulation of these emerging contaminants highlight the need for research on REY uptake by (aquatic) plants.. Duckweeds are widespread macrophytes …

A rare earth element (REE) geochemical finger exercise was undertaken with the aim of distinguishing contributing sources in the event that these sources have a significantly different ...

The 17 rare earth elements are: lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), scandium (Sc), and yttrium (Y). Scandium and yttrium are …

Rare earth elements (REEs) are commonly used as geochemical tracers in the study of many geologic processes because of their unique, ... Furthermore, because the naturally occurring REEs exhibit similar ionic radii and identical charge to trivalent actinides (Am 3+, Cm 3+, Cf 3+), ...

Mineral Resources Program, Alaska Science Center. January 26, 2023. Multidisciplinary Investigations of REE Mineralization at Mountain Pass and in the …

Rare-earth elements (REEs) are used in a wealth of high-tech applications, including permanent magnets, lasers, phosphors, catalytic converters, and batteries 1,2,3,4, owing to their 4 f peculiar ...

Chloroplasts and chlorophylls were isolated from the leaves of Dicranopteris linearis, a natural perennial fern sampled at rare earth element (REE) mining areas in the South-Jiangxi region (southern China). The inductively coupled plasma-mass spectrometry (ICP-MS) results indicated that REEs were present in the chloroplasts and chlorophylls of D. …

Environmental Pollution 76 (1992) 157-162 Rare earth elements (REEs) in naturally grown plants in relation to their variation in soils Hideki Ichihashi,a Hideyoshi Moritab & Ryo Tatsukawaa ODepartment of Environment Conservation, Ehime University, Tarumi 3-5-7, Matsuyama 790, Japan bSchool of Medical Sciences, University of …

The rare earth metals naturally have three positive charges and form incredibly strong ionic bonds with phosphate counterions, each possessing three negative charges. The extraction process must ...

Thulium: The rarest of all naturally occurring rare earth metals. Has few commercial applications, although it is used in some surgical lasers. After being exposed to radiation in nuclear reactors ...

Abstract. The use of rare earth elements is a growing trend in diverse industrial activities, leading to the need for eco-friendly approaches to their efficient recovery and reuse. The aim of this work is the development of an environmentally friendly and competitive technology for the recovery of those elements from wastewater.

Rare earth elements (generally abbreviated as REEs) are the name used to define 17 metals with special physicochemical features. In general, REEs are interest of chemists mainly because of their peculiar chemical abilities. However, this situation started to change, and REEs, recently, turn out to be a hotspot also for environmental biologist, …

The rare earth elements (REEs) comprise the 13 naturally occurring lanthanides, yttrium and scandium 1.These elements have crustal abundances similar to those of copper, zinc and molybdenum 2,3 ...

Obtaining rare earth elements begins with obtaining source materials, which can happen, broadly, in three ways: primary extraction, or mining directly from the earth; …

By National Minerals Information Center. Statistics and information on the worldwide supply of, demand for, and flow of the mineral commodity group rare earths - scandium, yttrium, …

Rare earth elements (REEs) present a group of nonessential metals for the growth and development of plants. At high concentrations, they can induce internal stress and disturb the physiological ...

The behavior of rare earth elements in naturally and anthropogenically acidified waters. Author links open overlay panel Scott A. Wood a, Christopher H. Gammons b, Stephen R. Parker b. Show more. ... Rare earth elements (REEs) are valuable raw materials which are in great demand in modern high technology industries. …

Plants that naturally accumulate aluminium (Al) may also inadvertently accumulate rare earth elements (REEs) due to the similar chemical properties of Al and REE trivalent ions, and vice versa.

The last naturally occurring rare earth element (lutetium) was discovered by 1907, but research into the chemistry of these elements was difficult, as no one knew how many real rare earth elements there were. Fortunately, 1913-14 solved the situation with the research of Danish physicist Niels Bohr and English physicist Henry Gwyn Jeffreys Moseley.