Abstract Rare earth–Mg–Ni-based hydrogen storage alloy has been synthesized by vacuum induction levitation melting and sieved into five particle size fractions from 120 mesh to below 800 mesh. The effect of particle size on the electrochemical behaviors has been investigated. It was found that the alloy electrode with the particle size of 220–325 mesh exhibited better cyclic stability ...
21-08-2013· In the past few years, rare earth metals (REMs) have received special attention because they are considered critical. In general, a resource is critical when it is scarce, is subject to potential supply constraints, costly, and is needed for a particular function where substitutes are inferior.1–5 Although REMs are relatively abundant in the Earth's crust, discovered minable concentrations ...
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Keywords: rare-earth manganites, manganite nanoparticles, synthesis, ... nanoparticles with average particle size in the range of 50–100 nm for both ultrasonication and 4 h (h) ...
04-12-2019· The particle size of crystalline rare-earth carbonates with large particle size is in the range of 50–200 μm. With an RE 2 O 3 content of up to 95wt%, the quality of crystalline rare-earth...
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18-03-2020· In this paper, we report original data on rare earth elements in various particle size fractions separated from the topsoil horizons of two small erosional landforms located in an uncontaminated area of the central part of European Russia (the Middle Protva basin, the Kaluga region).
01-06-2020· The boundaries between particle size classes were defined in accordance with the Russian conventional fraction groups : coarse and medium sand (1000–250 µm), fine sand (250–50 µm), coarse silt (50–10 µm), medium and fine silt (10–1 µm), clay (<1 µm).
Crystalline rare-earth (RE) carbonates having large particle size were prepared from the lixivium of weathered crust elution-deposited rare-earth ores using the precipitation method with ammonium bicarbonate as the precipitant. Their chemical composition was studied using elemental and thermogravimetric analyses (TGA), and their structure and morphology were characterized using …
01-02-2020· Five size fractions were produced, with mass median diameters of 2.2, 5.4, 9.7, 19.4, and 43.2 μm. The Rare Earth Elements (REE) were enriched or depleted in the different size fractions: all REYs were enriched by a factor of 1.05–1.65 in the finest fraction, but depleted in the coarsest fraction by a factor of 0.63 to 0.78.
DUHAN: EFFECT OF SINTERING TIME ON PARTICLE SIZE OF RARE EARTH COMPOUNDS 873 scanning electron microscopy (SEM) data are of the prepared samples. 2 Experimental Details Binary oxide clusters were prepared by sol-gel technique 15. Neodymium oxide was introduced in the pre-hydrolyzed solution in the form of nitrate under heating.
28-06-2018· Although the initial distribution and particle size of the rare earth tailings are different, the measured data of the particle size distribution with the fractal dimension greater than 2.2 shows ...
Submicron-sized spherical oxalate particles of rare earths were prepared by using an emulsion liquid membrane (ELM, water-in-oil-in-water (W/O/W) emulsion) system, consisting of Span 83 (sorbitan ses...
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The effects of particle size, temperature, and leaching time on the leaching behavior of rare-earth elements were studied. The leaching efficiency of the rare earth reached 39.24% under leaching conditions of hydrochloric acid concentration of 8.00 mol/L, particle size 95% distributed below 1.5 μm, leaching time of 120 min, and temperature of 90 °C.
15-01-2021· Rare earth ore samples used in this experiment were obtained from the rare earth tailings of an in-situ leaching mine in the Zudong Mining Area of Longnan, Jiangxi Province (24°8′ north latitude, 114°8′ east longitude), China; the sampling location is shown in Fig. 1.Based on field profile data, the mine profile was divided into the humic layer, completely weathered layer, partly ...
METHODS FOR BINDING RARE EARTHS TO SPECIFIC FEED PARTICLES . Updated September 2013. I. References: Ellis, W.C. and D.E. Beever. 1984. "Methods for binding rare earths to specific feed particles. In: P.M. Kennedy (Ed.)." Techniques in Particle Size Analysis of Feed and Digesta in Ruminants. pp. 154-165.
Rare earth elements (REEs) are utilized in various applications that are vital to the automotive, petrochemical, medical, and information technology industries. As world demand for REEs increases, critical shortages are expected. Due to the retention of REEs during coal combustion, coal fly ash is increasingly considered a potential resource.
Provided is a group of rare-earth regenerator material particles having an average particle size of 0.01 to 3 mm, wherein the proportion of particles having a ratio of a long diameter to a short diameter of 2 or less is 90% or more by number, and the proportion of particles having a depressed portion having a length of 1/10 to ½ of a circumferential length on a particle surface is 30% or more ...
Nanosized particle materials with different structures and grain sizes were prepared by doping TiO 2 or ZrO 2 with rare earth (RE) elements, and by changing the method of treatment. Their microstructures were confirmed by X-ray diffraction (XRD) analyses and measurements of the surface areas, pore volumes, and pore sizes of the particles.The electrorheological (ER) performance and dielectric ...
METHODS FOR BINDING RARE EARTHS TO SPECIFIC FEED PARTICLES . Updated September 2013. I. References: Ellis, W.C. and D.E. Beever. 1984. "Methods for binding rare earths to specific feed particles. In: P.M. Kennedy (Ed.)." Techniques in Particle Size Analysis of Feed and Digesta in Ruminants. pp. 154-165.