Extreme enrichment of arsenic and rare earth elements in acid mine drainage: Case study of Wiśniówka mining area (south-central Poland) Environ Pollut . 2019 Jan;244:898-906. doi: 10.1016/j.envpol.2018.10.106.
Mar 01, 2017· The formation of secondary manganese oxides exceptionally enriched in rare earth elements is established. • The main component is a birnessite-type MnO 2 into which the REE are firmly incorporated even at pH as low as 1.5.. There is a strong preference for the trivalent REE in the mineral structure over divalent and monovalent metals.
Rare-earth element abundances of basalts, of both terrestrial and lunar origins. The Europium anomaly is the phenomenon whereby the europium (Eu) concentration in a mineral is either enriched or depleted relative to some standard, commonly a chondrite or mid-ocean ridge basalt ( MORB ). In geochemistry a europium anomaly is said to be "positive ...
When a rare-earth deposit undergoes such weathering, it may be enriched in rare earth elements in concentrations of economic interest. A particular type of REE deposit, the ion-absorption type, is formed by the leaching of rare earth elements from seemingly common igneous rocks and fixing the elements onto clays in soil.
A. (1986) Rare earth elements in the shells of benthic foraminifera. Eo.r 67, 1064. onstrated that the characteristic REE pattern of sea water EI_IXRFIELDH. and GREAVESM. J. (I 982) The rare earth elements evolves in the direction of deep-ocean circulation.
The rare earths are hosted in secondary rare earths phosphate minerals that can contain up 60-70% REO. They are finely disseminated within various iron oxides, such as goethite and limonite. The rare earths phosphates within the CLD are predominantly light rare earths enriched, however heavy rare earths mineralisation in the form of crandallite ...
Feb 01, 2015· The objective of this study was to evaluate the effects of rare earth elements-enriched yeast (RY) on growth performance, nutrient digestibility, meat quality, relative organ weight, and excreta microflora in broiler chickens.
Dec 20, 2016· Ion adsorption rare earth element (REE) deposits in southern China are the exclusive source of heavy REEs (HREEs) in the world, and this HREE-enriched character of the deposits is inherited from the REE compositions of the underlying granitic rocks. Such HREE-enriched rocks form from heavy fractionation of reduced granitic magmas.
rare earth elements (REE), was recently found to host a REE+Y enriched Mn deposit denoted YBS, Ytterby black substance (Sj€oberg et al. 2017). Elemental analysis and phase analysis by XRD indicate that the dominant phase is a birnessite-type Mn oxide with low Fe content but with traces of organics. Poorly
Apr 11, 2019· The rare earth elements have become vital to manufacturing numerous high-tech products, which has been accompanied by a large increase in their demand. At the same time, there has been concern by the United States and many other Nations about the near-monopoly of mining, processing, and supply of REEs from one Nation, China.
Apr 01, 2020· It has been recognized that deep-sea sediments containing high concentrations of rare earth elements and yttrium (REY), termed "REY-rich mud", are widely distributed in the Pacific Ocean (Kato et al., 2011, Yasukawa et al., 2016).REY-rich mud has also been reported from the Indian and Atlantic oceans (Menendez et al., 2017, Yasukawa et al., 2014).
The Round Top rhyolite located in Trans-Pecos Texas is enriched in Be, F, Li, Nb, Rb, Sn, Th, U, Y, Zr, and rare earth elements (REEs). REE-bearing minerals are mainly ubiquitous nano-scale accessory phases throughout the groundmass, incorporated in synchysite-group minerals, xenotime-(Y), Y- and Ce-rich fluorite, and zircon. The rhyolite is peraluminous, high-silica, …
Oct 01, 2021· Unofficial or illegal production of rare earths also contributed to China's dominance, where heavy REE-enriched deposits in southern provinces were targeted in a bid to capitalise on high prices in the late 2000s. As prices fell in the early 2010s, the environmental and social damage caused by illegal mining prompted a state-led crackdown on ...
Jul 06, 2013· Concern about security of supply of critical elements used in new technologies, such as the Rare Earth Elements (REE), means that it is increasingly important to understand the processes by which they are enriched in crustal settings. High REE contents are found in syenite-dominated alkaline complexes intruded along the Moine Thrust Zone, a major collisional zone …
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