Preparation of Tungsten Carbide from Scheelite Concentrate using Concentrated Energy Fluxes

Kuzmichev, Evgenii N.; Николенко, С. В.; Balakhonov, Denis

doi:10.1134/s0040579518040164

Cited by 4 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Savings by reducing the soot of alloying elements and deoxidizers in smelting can be determined by the formula: (8) where: C 1 , C 2 -the cost of alloying and de-oxidizing elements in the smelting of precision alloys before and after the introduction of the ligature, money units/t. Substituting specific expressions of current factors, in this case we obtain:…”

Section: Methods and Calculations Of Economic Efficiency Of Productio...mentioning

confidence: 99%

Melting of resource-saving alloys for precision Ni-Mo alloys: optimization of technical and economic indicators

Hryhoriev,

Shyshkanova,

Kulabnieva

et al. 2023

JCTM

View full text Add to dashboard Cite

show abstract

Section: Methods and Calculations Of Economic Efficiency Of Productio...mentioning

confidence: 99%

Melting of resource-saving alloys for precision Ni-Mo alloys: optimization of technical and economic indicators

Hryhoriev,

Shyshkanova,

Kulabnieva

et al. 2023

JCTM

View full text Add to dashboard Cite

show abstract

“…В последние годы появляются работы, посвященные получению WC из руды на одной из начальных стадий c последующим выделением данной фазы, например, карботермическим восстановлением в присутствии угля и магния с последующей очисткой продукта синтеза [26]. Также одним из методов переработки руды и синтеза кристаллических фаз карбида вольфрама является электродуговой синтез [27]. Существует перспективная модификация данного метода, характеризующаяся отсутствием вакуума или защитной газовой среды [28,29].…”

Section: Introductionunclassified

Influence of non-vacuum electric arc synthesis energy on the product of tungsten ore concentrate processing

Pak,

Kokorina,

Shanenkova

et al. 2024

IZVESTIYA

View full text Add to dashboard Cite

Relevance. Caused by the problem of developing methods for obtaining tungsten carbide, especially from tungsten-containing waste. As a solution, a non-vacuum electric arc method is proposed. It is easy to operate and cheap compared to a direct analogue (arc discharge method in inert gas atmosphere). The resulting product can be used as a catalyst carrier in hydrogen production reactions. Aim. To determine the current and the energy entered in the system, necessary to obtain a product with a largest proportion of the hexagonal phase of tungsten carbide WC from tungsten ore concentrate by a non-vacuum electric arc method and investigate a sample with the largest proportion of tungsten carbide phase. Object. Electric arc synthesis in open air from tungsten ore concentrate. Methods. Grinding in a SAMPLE SPEX 8000M ball mill, magnetic separation, non-vacuum electric arc method of synthesis, X-ray phase analysis on a Shimadzu XRD 7000s X-ray diffractometer (λ=1.54060 Å), scanning electron microscopy combined with X-ray fluorescence energy-dispersive analysis based on a TESCAN VEGA 3 microscope SBU with OXFORD X-Max prefix, transmission electron microscopy combined with energy dispersive spectroscopy and selected area electron diffraction based on the JEM-2100F microscope, scanning electron-ion microscopy based on the QUANTA 200 3D microscope. Results. The authors have built the dependence of the phase composition of the product of non-vacuum electric arc synthesis at current strengths from 50 to 220 A. Mass fraction of each of the identified phases in the synthesis product was determined using the reference intensity ratio. The current and the energy entered in the system, which provide the largest proportion of tungsten carbide WC in the synthesis product, are determined. The authors studied the product containing the largest proportion of tungsten carbide WC using scanning and transmission electron microscopy methods.

show abstract

Production of Metallic Tungsten and Tungsten Carbide from Natural Wolframite and Scheelite via Sulfide Chemistry

Boury,

Green,

Allanore

2023

Metall Mater Trans B

View full text Add to dashboard Cite

The development of sulfide-based chemistry and physical separation in the last decade opens new processes to produce metals at the industrial scale. Herein, a new route to produce metallic tungsten and tungsten carbides particles from natural wolframite (Fe,Mn)WO4 and scheelite CaWO4 is presented. Sulfidation of mineral concentrates breaks the tungstate crystal structure into a mix of sulfides, in particular tungsten disulfide WS2. The thermal instability of WS2 at high temperature allows for its subsequent, selective, thermal reduction to tungsten particles at around 1500 °C. Similar thermal reduction in the presence of carbon result in the production of tungsten carbides, WC and W2C, obtained at around 1250 °C. The other major components of the sulfidized concentrate remain un-reduced under the proposed conditions, demonstrating selective reduction of WS2 as a possible new route for W recovery. Similar findings are reported for the carburization of WS2.

show abstract

Preparation of Tungsten Carbide from Scheelite Concentrate using Concentrated Energy Fluxes

Cited by 4 publications

References 7 publications

Melting of resource-saving alloys for precision Ni-Mo alloys: optimization of technical and economic indicators

Melting of resource-saving alloys for precision Ni-Mo alloys: optimization of technical and economic indicators

Influence of non-vacuum electric arc synthesis energy on the product of tungsten ore concentrate processing

Production of Metallic Tungsten and Tungsten Carbide from Natural Wolframite and Scheelite via Sulfide Chemistry

Contact Info

Product

Resources

About