effect of rare earth oxide ncentrate on reaction

Effect of rare-earth oxide concentrate on reaction ...

Ceramics hlternational 20 (1994) 31-37 Effect of Rare-Earth Oxide Concentrate on Reaction, Densification and Slag Resistance of AI203-SiO2 Ceramic Refractories Chen-Feng Chan Yung-Chao Ko China Steel Corporation, P.O. Box 47-29, Hsiao Kang, Kaohsiung 81233, Taiwan (Received 5 January 1993: accepted I March 1993) Abstract: Ceramic bodies of mullite composition were prepared

Non-ammonia enrichment of rare earth by magnesium oxide ...

In summary, the optimum conditions for the enrichment of rare earth from rare earth leaching liquor by magnesium oxide precipitation are chosen to be 95% MgO additive amount, a precipitation temperature of 35 °C, a feeding speed of 1.5 mL/min, 0.2 mol/L magnesium oxide slurry (C OH −), 0.80 g/L rare earth concentration and 1.0 g/L Mg 2 ...

Effects of rare earth oxide nanoparticles on root ...

The phytotoxicity of four rare earth oxide nanoparticles, nano-CeO 2, nano-La 2 O 3, nano-Gd 2 O 3 and nano-Yb 2 O 3 on seven higher plant species (radish, rape, tomato, lettuce, wheat, cabbage, and cucumber) were investigated in the present study by means of root elongation experiments. Their effects on root growth varied greatly between different nanoparticles and plant species.

Non-ammonia enrichment of rare earth elements from rare ...

Due to the formation of RE 2 (OH) 4 SO 4 xH 2 O, the content of SO 3 in the rare earth concentrate obtained by calcium oxide precipitation was more than 10%, and the purity of the rare earth concentrate was less than 82%. However, the required purity of rare earth concentrate is more than 92%(GB/T20169-2006, 2006).

Effects of different types of rare earth oxide additives ...

5 wt% of different types of rare earth oxides (Re 2 O 3, Re = Lu, La, Yb, Y, Nd, Er, Sm, Ce, Dy, Eu, Gd) and 2 wt% MgO as additives were selected in this study based on previous studies on rare earth oxide additive concentrations.The effects of rare earth oxide type on the microstructure, phase composition, thermal conductivity, mechanical properties, and dielectric properties of silicon ...

Decomposition Of Rare Earth Concentrate Vican Chem.

Rare earth concentrate in the rare earth, generally insoluble in water carbonate, fluoride, phosphate, oxide or silicate and other forms. Must be through a variety of chemical change to rare earth into soluble in water or inorganic acid compounds, after dissolving, separation, purification, concentration and calcination process, made all kinds of mixed rare earth compounds such as mixed rare ...

Mixed rare earth concentrate leaching with HCl–AlCl 3 solution

A method of Baotou mixed rare earth concentrate leaching was investigated. According to the principle of complex leaching, the quadratic orthogonal regression experiment was used to investigate effect of six factors. An optimal condition of low energy and environment friendly was determined as follows: HCl acidity is 4 molL−1, AlCl3 concentration is 2 molL−1, reaction temperature is 85 ...

Effect of Addition of Rare Earth Oxide Concentrates on ...

Rare earth elements are often added to chromium dioxide forming alloys to improve its high temperature oxidation resistance. The rare earths can be also added as oxide dispersions. Significant cost reductions are possible if rare earth oxide concentrates can be used instead of pure rare earth oxides, the former being the precursor to obtaining pure rare earth oxide.

Effect Of Rare Earth Oxide Concentrate On Reaction

Effect of particle size refinement on the leaching. Effect Of Rare Earth Oxide Concentrate On Reaction. Effect of particle size refinement on the leaching.

Effect of doping rare earth oxide on performance of copper ...

Effect of doping rare earth oxide on performance of copper-manganese catalysts for water-gas shift reaction Article in Journal of Rare Earths 32(4):298–305 April 2014 with 20 Reads

[Experimental study of catalytic reduction of SO2 on CeO2 ...

Addition of rare earth oxide CeO2 with variable valences to La2O3 formed a mixture of rare earth oxides. ... experimental were investigated for studying the activation process of this catalyst and effect factors such as temperature and concentration ratio of reactant on the activation reaction under the following conditions: composition of the ...

Effect of rare earth oxide doping on MgAl 2 O 4 spinel ...

Effect of rare earth oxide doping on MgAl 2 O 4 spinel obtained by sintering of secondary aluminium dross ... increases with the increase in the concentration of the alkaline solution and rise in ...

Thermal Conductivity of β‐Si3N4: III, Effect of Rare‐Earth ...

β‐Si 3 N 4 ceramics sintered with a series of rare‐earth (RE = La, Nd, Gd, Y, Yb and Sc) oxide additives were fabricated by hot pressing and subsequent annealing. Their microstructures, lattice oxygen contents, and thermal conductivities were evaluated. Mean grain size increased, while lattice oxygen content decreased, and hence, thermal conductivity increased with decreasing ionic radius ...

The effect of carbon and rare earth oxide co-doping on the ...

Abstract. Carbon (C) and rare earth oxide (REO) co-doped bulk polycrystalline MgB 2 samples with nominal compositions Mg 1 - y (REO) y (B 0.95 C 0.05) 2 (where y = 0.00, 0.01, 0.03, 0.05 and REO = Eu 2 O 3 or Pr 6 O 11) have been synthesized via a solid state reaction route.The XRD results reveal the presence of impurity phases EuB 6 in Eu 2 O 3 and PrB 4 and PrB 6 in Pr 6 O 11 co-doped ...

Effects of Rare‐Earth (RE) Intergranular Adsorption on the ...

Sea-Hoon Lee, Jae-Woong Ko, Young-Jo Park, Hai-Doo Kim, Hua-Tay Lin, Paul Becher, Sintered-reaction Bonded Silicon Nitride Densified by a Gas Pressure Sintering Process - Effects of Rare Earth Oxide Sintering Additives, Journal of the Korean Ceramic Society, 10.4191/kcers.2012.49.4.318, 49, 4, (318-324), (2012).

Separation of fluorine/cerium from fluorine-bearing rare ...

3.3.5 Effect of coexisting rare earth ions. A variety of other rare earths generally accompany cerium in fluorine-bearing rare earth sulfate solutions, such as La, Pr, Nd and Sm. The influence of coexisting rare earth ions on the adsorption of fluorine and the separation of fluorine and rare earths was investigated. The results are shown in ...

Toxicological Evaluations of Rare Earths and Their Health ...

Mar 11, 2013 Given the recent toxicological results on the exposure of cells, animals and workers to rare earth compounds, it is important to review the toxicological studies, in order to improve the current understanding of the rare earth compounds. This will also help to establish a sustainable, safe and healthy working environment for the RE industries.

Surface chemistry of rare-earth oxide surfaces at ambient ...

Rare-earth oxide surfaces take an important role in catalysis and are used to catalyse a broad range of on-surface reactions, e.g. the. conversion of syngas (CO+H 2 ) to alcohol, carbon monoxide ...

The effect of carbon and rare earth oxide co-doping on the ...

The effect of carbon and rare earth oxide co-doping on the structural and superconducting properties of MgB2 NOjha1, V K Malik2, Rashmi Singla1, C Bernhard2 and GDVarma1,3 1 Department of Physics, Indian Institute of Technology Roorkee, Roorkee-247667, India 2 Department of Physics and Fribourg Centre for Nanomaterials-FriMat, University of Fribourg, Chemin du Musee, CH-1700 Fribourg,

Effects of Rare Earth Metals on Steel Microstructures

May 27, 2016 Rare earth metals are used in semiconductors, solar cells and catalysts. This review focuses on the background of oxide metallurgy technologies, the chemical and physical properties of rare earth (RE) metals, the background of oxide metallurgy, the functions of RE metals in steelmaking, and the influences of RE metals on steel microstructures.

Hydroxamate Collectors for Rare Earth Minerals Flotation ...

The infrared spectra for Dh and rare earth cation by analysis in theory showed that Dh formed chelate complex with rare earth cation and were adsorbed on the surfaces of rare earth minerals.

Effect of doping rare earth oxide on performance of copper ...

Effect of doping rare earth oxide on performance of copper-manganese catalysts for water-gas shift reaction Article in Journal of Rare Earths 32(4):298–305 April 2014 with 20 Reads

Effect of Addition of Rare Earth Oxide Concentrates on ...

Rare earth elements are often added to chromium dioxide forming alloys to improve its high temperature oxidation resistance. The rare earths can be also added as oxide dispersions. Significant cost reductions are possible if rare earth oxide concentrates can be used instead of pure rare earth oxides, the former being the precursor to obtaining pure rare earth oxide.

Effect of rare earth oxide doping on MgAl 2 O 4 spinel ...

Effect of rare earth oxide doping on MgAl 2 O 4 spinel obtained by sintering of secondary aluminium dross ... increases with the increase in the concentration of the alkaline solution and rise in ...

The effect of carbon and rare earth oxide co-doping on the ...

Abstract. Carbon (C) and rare earth oxide (REO) co-doped bulk polycrystalline MgB 2 samples with nominal compositions Mg 1 - y (REO) y (B 0.95 C 0.05) 2 (where y = 0.00, 0.01, 0.03, 0.05 and REO = Eu 2 O 3 or Pr 6 O 11) have been synthesized via a solid state reaction route.The XRD results reveal the presence of impurity phases EuB 6 in Eu 2 O 3 and PrB 4 and PrB 6 in Pr 6 O 11 co-doped ...

Surface chemistry of rare-earth oxide surfaces at ambient ...

Rare-earth oxide surfaces take an important role in catalysis and are used to catalyse a broad range of on-surface reactions, e.g. the. conversion of syngas (CO+H 2 ) to alcohol, carbon monoxide ...

Separation of fluorine/cerium from fluorine-bearing rare ...

3.3.5 Effect of coexisting rare earth ions. A variety of other rare earths generally accompany cerium in fluorine-bearing rare earth sulfate solutions, such as La, Pr, Nd and Sm. The influence of coexisting rare earth ions on the adsorption of fluorine and the separation of fluorine and rare earths was investigated. The results are shown in ...

Effects of Rare Earth Metals on Steel Microstructures

May 27, 2016 Rare earth metals are used in semiconductors, solar cells and catalysts. This review focuses on the background of oxide metallurgy technologies, the chemical and physical properties of rare earth (RE) metals, the background of oxide metallurgy, the functions of RE metals in steelmaking, and the influences of RE metals on steel microstructures.

Hydroxamate Collectors for Rare Earth Minerals Flotation ...

The infrared spectra for Dh and rare earth cation by analysis in theory showed that Dh formed chelate complex with rare earth cation and were adsorbed on the surfaces of rare earth minerals.

Gibbs energies of formation of rare earth oxysulfides

by reaction of rare earth oxides with diatomic sulfur gas has been measured in the temperature range 870 to 1300 K using the solid state cell: Pt/Cu + Cu2S//R202S -1- R203 II (CaO)ZrO2 II Ni + NiO, Pt where R = La, Nd, Sm, Gd, Tb, and Dy. The partial pressure of diatomic sulfur over a mixture of rare earth oxide (R~O3) and oxysulfide (R202S) is ...

Rare Earth Elements - Purification, Separation and Recycling

REO – Rare Earth Oxide/s. When talking about REE production numbers, this may refer to “REO equivalents by weight” as a unit of measurement rather than the chemical nature of the product.

Influence of Rare Earth Doping on the Structural and ...

May 28, 2008 The characterization of undoped and rare earth-doped tin oxide nanoparticles has been previously reported [].Figure 1 illustrates the XRD patterns of the phase evolution of the undoped and doped (Ce and Y) SnO 2 particles annealed at different temperatures. Diffraction peaks related to a secondary phase formation (Sn 2 Y 2 O 7) for Y-doped SnO 2 were observed above a 900 °C heat

Formation and thermal decomposition of rare-earth ...

The presence of CO 2 during heating had minimal effect on the decomposition of Ln 2 (CO 3) 3 to La 2 O 2 CO 3 but raised significantly the decomposition temperature of Ln 2 O 2 CO 3 to the oxide. As CO 2 is a major product of the rare-earth oxide catalysed oxidative coupling of methane, these observations indicate that the state of catalyst ...

rare-earth element Uses, Properties, Facts Britannica

Rare-earth element, any member of the group of chemical elements consisting of three elements in Group 3 (scandium [Sc], yttrium [Y], and lanthanum [La]) and the first extended row of elements below the main body of the periodic table (cerium [Ce] through lutetium [Lu]). The elements cerium through lutetium are called the lanthanides, but many scientists also, though incorrectly, call those ...

INVESTIGATION OF THE CARBOCHLORINATION PROCESS

1. Carbochlorination of the rare earth oxide 2. Dissolution of the rare earth chloride in the molten electrolyte 3. Electrowinning of the rare earth metals This project focused on proving the carbochlorination reaction for cerium oxide and neodymium oxide as well as optimizing the process parameters involved.