Production of Fine Tungsten Powder by Electrolytic Reduction of Solid CaWO4in Molten Salt

In this study, the corrosion behavior of new Ni-based structural materials was studied for electrolytic reduction after exposure to LiCl-Li2O molten salt at 650°C for 24-216h under an oxidizing atmosphere. The new alloys with Ni, Cr, Al, Si, and Nb as the major components were melted at 1700°C under inert atmosphere. The corrosion products and fine structures of the corroded specimens were characterized by SEM, EDS, and XRD. The corrosion rate of 12wt% Cr-2wt% Si alloys and 12wt% Cr-5wt% Si alloys are below 0.3mm/year. However, the corrosion rate of 20wt% Cr-5wt% Si is 0.6mm/year. Also, the corrosion products of 12wt% Cr alloys were Cr2O3, NiCr2O4, Ni, and NiO; those of 20wt% Cr alloys were Cr2O3, LiAl2Cr3O8, and NiO. The higher corrosion rate of 20wt% Cr-5wt% Si could be the higher solute concentration which leads to an unstable alloy formation. As confirmed by the pseudo binary phase diagram of (Ni-Cr-Al-Nb)-Si, the solubility of the silicon with 20 wt% of Cr decreased to 4 wt% from 5 wt% with 12 wt% of Cr.

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An experimental study for Li recycling in an electrolytic reduction process for UO2 with a Li2O–LiCl molten salt

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2013.06.009 ◽

2013 ◽

Vol 441 (1-3) ◽

pp. 232-239 ◽

Cited By ~ 11

Author(s):

Wooshin Park ◽

Jin-Mok Hur ◽

Sun-Seok Hong ◽

Eun-Young Choi ◽

Hun Suk Im ◽

...

Keyword(s):

Experimental Study ◽

Molten Salt ◽

Reduction Process ◽

Electrolytic Reduction

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Electro-reduction of hematite using water as the redox mediator

Green Chemistry ◽

10.1039/c8gc02756k ◽

2019 ◽

Vol 21 (2) ◽

pp. 198-204 ◽

Cited By ~ 8

Author(s):

Kaiyu Xie ◽

Ali Reza Kamali

Keyword(s):

Molten Salt ◽

Large Scale ◽

Cost Effective ◽

Redox Mediator ◽

Electrolytic Reduction ◽

Scale Production ◽

Large Scale Production ◽

Cost Effective Approach

Molten salt electrolytic reduction of Fe2O3 in the presence of water is proposed as a sustainable and cost-effective approach for large-scale production of iron.

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Evaporation of CsCl, BaCl2, and SrCl2 from the LiCl–Li2O molten salt of the electrolytic reduction process

Journal of Radioanalytical and Nuclear Chemistry ◽

10.1007/s10967-014-3330-8 ◽

2014 ◽

Vol 303 (1) ◽

pp. 223-227 ◽

Cited By ~ 6

Author(s):

I. S. Kim ◽

D. Y. Chung ◽

M. S. Park ◽

J. M. Hur ◽

J. K. Moon

Keyword(s):

Molten Salt ◽

Reduction Process ◽

Electrolytic Reduction

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Investigation of X-ray radiation effect on the structure and microhardness of tungsten powder filled composite

Izvestiya Vuzov Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Universitiesʹ Proceedings Powder Metallurgy аnd Functional Coatings) ◽

10.17073/1997-308x-2018-3-87-92 ◽

2018 ◽

pp. 87-92

Author(s):

A. A. Lozovan ◽

F. E. Vilkov

Keyword(s):

Radiation Resistance ◽

Tungsten Powder ◽

Absorbed Dose ◽

Test Material ◽

Simultaneous Increase ◽

X Ray ◽

Local Stresses ◽

Before And After ◽

Fine Tungsten ◽

High Degree

The study focuses on the radiation resistance of a composite filled with fine tungsten powder having the 200–500 nm particle size. The studied composite is designed to provide radiation protection of electronic equipment. A sample with the test material was exposed to continuous spectrum X-ray radiation to an absorbed dose of 3 MGy. A characteristic of radiation resistance was sample microhardness measured before and after X-ray irradiation. Scanning electron microscopy was used to study the microstructure of a sample transverse cleavage after irradiation, and it was found that the sample had no visible defects in its structure. This result can be explained by uniform energy dispersion from local stresses due to high degree of composite filling with tungsten powder having a high thermal conductivity coefficient. The study of sample microhardness showed its 10 % increase attributable to the radiation hardening effect where increasing strength results in a simultaneous increase in microhardness. Experiments proved that this effect is manifested with an increase in the absorbed radiation dose.

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Carbon anode with repeatable use of LiCl molten salt for electrolytic reduction in pyroprocessing

Journal of Radioanalytical and Nuclear Chemistry ◽

10.1007/s10967-016-4786-5 ◽

2016 ◽

Vol 310 (1) ◽

pp. 463-467 ◽

Cited By ~ 15

Author(s):

Sung-Wook Kim ◽

Min Ku Jeon ◽

Hyun Woo Kang ◽

Sang-Kwon Lee ◽

Eun-Young Choi ◽

...

Keyword(s):

Molten Salt ◽

Electrolytic Reduction ◽

Carbon Anode

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Fine Spherical Tungsten Powder Prepared by Precipitation Reaction

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.117-119.967 ◽

2011 ◽

Vol 117-119 ◽

pp. 967-970

Author(s):

Tao Lin ◽

Yan Jun Li ◽

Cheng Yi Wu ◽

Zhi Meng Guo

Keyword(s):

Particle Size ◽

Tungsten Powder ◽

Sodium Dodecyl ◽

Precipitation Reaction ◽

Mechanical Agitation ◽

Ammonium Tungstate ◽

Fine Tungsten ◽

Strong Acids ◽

Addition Amount ◽

Uniform Particle Size

The spherical tungsten powder was prepared by chemical reaction with ammonium tungstate and strong acids under ultrasonic and mechanical agitation. After precipitation reaction, the precipitate was dried and grinded, and then reduced into tungsten powder with hydrogen. The effects of acid kinds and dispersant on the fine tungsten powder were studied in this paper. The result shows that the acid kinds and its addition amount have great effect on the shape of tungsten particles. The tungsten powder with uniform particle size and spherical could be prepared by adding 17ml sulfric acid into 100ml ammonium tungstate. The tungsten particles can be finer and more dispersive, and have a spherical with addition of dispersant SDS (Sodium dodecyl sulfate). The particle size is about 1.5 micrometer.

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