Surfacing With Tungsten-containing Ores

Козырев, Н. А.; Galevsky, G V; Valuev, Denis V.; Шурупов, В. М.; Kozyreva, O. E.

doi:10.1088/1757-899x/91/1/012009

Cited by 3 publications

(4 citation statements)

References 2 publications

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“…At the O:C ratios in the charge of 1.65 and 1.33, along with the reduction to W, there are the reactions of W 2 C formation. This is consistent with the results reported in papers [3,7,8], which show the course of carbide formation along with the reduction processes. The residual nature of the WO 2 manifestation was noted, which is different from the results given in [12,13], where the reduction products additionally contained WO 3 W 4 O 11 , W 20 O 58 , W 12 O 49 .…”

Section: Discussion Of Results Of Studying the Properties Of The Redu...supporting

confidence: 93%

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Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon

Ryndiaiev

Kholodiuk

Khmelovskyi

et al. 2021

EEJET

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This paper reports a study into the phase composition and microstructure of tungsten ore concentrate after carbon-thermal reduction at different O:C ratios in the charge. This is required for determining those indicators that reduce tungsten loss through the sublimation of oxide compounds when processing ore concentrates, as well as when using reduced tungsten-containing doping additives. The study results have established that the reduced tungsten concentrate at the O:C ratio in the charge within the interval of 1.33‒2.30 contained the phases of W, W2C C, C, WO2. The microstructure demonstrated a spongy and disordered character. Together with W, the Mo, Si, Ca, Al impurities were present in the reduced products. The main elements identified at the sites studied had the following limiting content, % by weight: O – 5.01–17.32; C – 0.84–4.23; W – 61.21–86.78; Mo – 1.57–7.51; Si – 2.07–9.06; Ca – 1.34–11.30; Al – 0.27–0.40. The micro-inclusions at the examined surface areas acquired different complex shapes. There were traces of the process of caking between the particles. The analysis of the resulting data has shown that the most preferred ratio of O:C in the charge was 1.65. In this case, there is no lack of carbon and there is a predominance of W in the phase composition with a relatively little manifestation of the W2C phases, carbon, as well as the residual part of WO2. The post-reduction of the oxide component would occur during the doping process. The sponge structure contributes to a higher dissolution rate compared to standard tungsten ferroalloys. Lack of compounds with a relatively high propensity for sublimation does not require any special conditions to prevent the loss of tungsten in the gas phase, which increases the degree of assimilation of the target element

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Section: Discussion Of Results Of Studying the Properties Of The Redu...supporting

confidence: 93%

“…Of special interest is a study into the thermodynamic equilibrium in the reduction of individual tungsten oxides by carbon reported in [3]. The possibility of reactions to form W 2 C and WC carbides, along with the reduction to W, was confirmed.…”

Section: Literature Review and Problem Statementmentioning

confidence: 98%

Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon

Ryndiaiev

Kholodiuk

Khmelovskyi

et al. 2021

EEJET

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“…Some particles with higher contents of Mo, W, Nb, and C (Figure 3, areas 2, 4, 10, 13) can constitute the carbide phases. This corresponds to the results of the thermodynamic (Figure 1) and phase (Figure 2) studies, based on which we determined that the phases in the specified surface areas may contain carbides such as WC, W 2 C, and W 2 C•Mo 2 C. This also agrees with the results of studies regarding the reduction mechanisms of W [17][18][19] and Mo [16] oxides. It was also found that the metallic and carbide components were formed in parallel at the final stage of the reduction.…”

Section: Discussionsupporting

confidence: 89%

“…The conditional division of the process into the primary interaction of MoO 3 with carbon occurred with the carbon gasification reaction, as did the further reduction of MoO 2 with the involvement of carbon monoxide. The authors of [17] made calculations using thermodynamics and determined the equilibrium of WO 3 reduction reactions with the involvement of carbon and carbon monoxide at a temperature of 1500-6000 K. The obtained characteristics of the reactions showed that the reduction of WO 3 most likely occurred to produce tungsten and then the carbides W 2 C and WC. As was indicated in [18], there are stages of WO 3 transformation through WO 2,72 and WO 2 to W. The tungsten reduction takes place at a temperature of 1223 K. The tendency to form carbides, along with the reduction of oxide tungstencontaining compounds, was confirmed by the studies contained in [19].…”

Section: Introductionmentioning

confidence: 99%

Development of the Recycling of Alloyed Metallurgical Waste: Features of Phase and Structural Transformations

Smirnov,

Petryshchev,

Bilko

et al. 2023

Minerals

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The features of structural and phase transformations during the processing of alloyed metallurgical wastes using reduction smelting are determined herein. This is necessary in order to determine the technological parameters of the melting process that ensure the reduction in the losses of alloying components. The use of X-ray phase analysis in combination with the methods of raster electron microscopy and X-ray microanalysis ensured the identification of the microstructure features and the chemical composition of individual phases and inclusions in the metal. Our study identified new technological aspects of high-alloyed technogenic waste processing using reduction smelting. The obtained parameters of the resource-saving alloying compound provide the possibility to replace parts of the standard ferroalloys in steelmaking processes.

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Influence of Filler Metals in Welding Wires on the Phase and Chemical Composition of Weld Metal

Козырев

Osetkovskiy

Козырева

et al. 2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Surfacing With Tungsten-containing Ores

Cited by 3 publications

References 2 publications

Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon

Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon

Development of the Recycling of Alloyed Metallurgical Waste: Features of Phase and Structural Transformations

Influence of Filler Metals in Welding Wires on the Phase and Chemical Composition of Weld Metal

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