Results 11 to 20 of about 123 (90)

Rare Earth Occurrence States of Weathered Crust Elution-Deposited Rare Earth Ores in Southern Yunnan

Minerals, 2023
To reveal the regularity of variation in the rare earth occurrence states of weathered crust elution-deposited rare earth ores, ore samples from different weathering crust layers were obtained by performing the sequential extraction procedure. The order of rare earth contents firmly obeyed the following sequence: the weathered layer > humic layer ...
Wendou Chen, Zhenyue Zhang, Fei Long, Zhuo Chen, Ru’an Chi   +4 more
openaire   +2 more sources

Study on the Leaching Kinetics of Weathered Crust Elution-Deposited Rare Earth Ores by Hydroxypropyl Methyl Cellulose

Minerals, 2023
In the process of the in situ leaching of weathered crust elution-deposited rare earth ores (WCE-DREOs), there are many problems in the conventional leaching agent, such as a slow leaching rate, low leaching yield and long leaching period. In order to solve the above problems, 2.0 wt% ammonium sulfate was mixed with hydroxypropyl methyl cellulose (HPMC)
Huifang Yang, Aoyang Sha, Zhengyan He, Chenjie Wu, Yuanlai Xu, Jingjing Hu, Zhigao Xu, Ruan Chi   +7 more
openaire   +2 more sources

Leaching Process of Weathered Crust Elution-Deposited Rare Earth Ore by Alkaline Earth Metal Carboxylate

Minerals
This study explores the use of alkaline earth metal carboxylates as sustainable alternatives to conventional ammonium-based lixiviants for the eco-friendly extraction of weathered crust elution-deposited rare earth ores. We investigated the impact of lixiviant concentration, pH, and leaching temperature on the extraction efficiency of rare earths and ...
Fei Long, Ruan Chi, Dan Li, Zhenyue Zhang   +3 more
openaire   +2 more sources

Effects of Ore Particle Size Distribution on Rare Earth Leaching Process of Weathered Crust Elution-Deposited Rare Earth Ores

Minerals
This paper investigates the rare earth (RE) leaching process of weathered crust leached rare earth ores (WCE-DREOs) with different ore particle sizes. Ore particles were categorized into seven distinct size ranges: −0.106 mm, +0.106 mm to −0.15 mm, +0.15 mm to −0.25 mm, +0.25 mm to −0.85 mm and +0.85 mm.
Fei Long, Wendou Chen, Zhenyue Zhang, Ru’an Chi   +3 more
openaire   +2 more sources

Mobilization of Tungsten in Greenstone Belts of the Archean Kaapvaal and Singhbhum Cratons

Geochemistry, Geophysics, Geosystems, Volume 24, Issue 12, December 2023., 2023
Abstract Due to the inherently fluid‐mobile nature of W, the 182W record of the early Earth may have been obscured by fluid‐induced mobilization of W. To investigate W mobilization in Archean greenstone sequences, we analyzed 182W isotope systematics and major and trace element concentrations in samples from the 3.53 Ga old Onverwacht Group of the ...
N. Messling, J. Jodder, E. Hegner, A. Hofmann, K. Wemmer, M. Willbold   +5 more
wiley   +1 more source

Age and Geochemistry of High Arctic Large Igneous Province Tholeiitic Magmatism in NW Axel Heiberg Island, Canada

Geochemistry, Geophysics, Geosystems, Volume 24, Issue 11, November 2023., 2023
Abstract The Cretaceous High Arctic Large Igneous Province (HALIP) in Canada involved extrusion of continental flood basalts (CFBs) at 130–120 Ma and 100‐95 Ma and emplacement of an extensive sill and dike network that intersected the Carboniferous to Paleogene Sverdrup Basin.
F. M. Deegan, V. Pease, I. G. Nobre Silva, J. H. Bédard, G. Morris   +4 more
wiley   +1 more source

Effect of particle gradation on pore structure and seepage law of solution in weathered crust elution-deposited rare earth ores

International Journal of Mining Science and Technology, 2023
Both CT and Avizo software were used to explore the effect of particle gradation on the evolution characteristics of pore structure and seepage paths in weathered crust elution-deposited rare earth ores during leaching.
Defeng Liu, Wenxin Yan, Zhenyue Zhang, Ruan Chi   +3 more
doaj   +1 more source

Cu‐Isotope Evidence for Subduction Modification of Lithospheric Mantle

Geochemistry, Geophysics, Geosystems, Volume 23, Issue 8, August 2022., 2022
Abstract Ultramafic xenoliths from southeastern Arizona, USA, provide evidence for Cu‐isotope heterogeneity in the lithospheric mantle. We report new data on Type I (Cr‐, Mg‐rich) peridotites, but also the first Cu‐isotope data for Fe‐Ti‐Al‐rich Type II pyroxenite (±amphibole) xenoliths.
Pamela D. Kempton, Ryan Mathur, Russell S. Harmon, Aaron Bell, Jochen Hoefs, Barry Shaulis   +5 more
wiley   +1 more source

Leaching Kinetics of Weathered Crust Elution-Deposited Rare Earth Ore with Compound Ammonium Carboxylate [PDF]

Minerals, 2020
Due to the special properties of the ammonium salts, ammonium acetate and ammonium citrate were used to explore the best leaching conditions of rare earth with compound ammonium carboxylate. This paper explored the influence of the molar ratio, ammonium concentration, experimental temperature, and pH of the compound leaching agents on the leaching ...
Xiuwei Chai, Guoqing Li, Zhenyue Zhang, Ruan Chi, Zhuo Chen   +4 more
openaire   +1 more source

Strength characteristics of weathered crust elution-deposited rare earthores with different porosity ratios

工程科学学报, 2018
The porosity ration of weathered crust elution-deposited rare earth ores is the main factor that affects the leaching results and the stability of the ore body.
YIN Sheng-hua, QI Yan, XIE Fang-fang, CHEN Xun, WANG Lei-ming   +4 more
doaj   +1 more source