Production of functional materials on the basis of tungsten multicomponent mineral resources

Kuzmichev, Evgenii N.; Ri, Khosen; Николенко, С. В.; Drozdov, E. D.; Balakhonov, Denis

doi:10.1051/matecconf/201710603030

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…Wolframite concentrates are complex multicomponent systems in which the proportion of the main mineral, wolframite, with the general formula FexMn1-xWO4, exceeds 90 %. The method of its sintering with carbonates of alkali metals at 1073-1173 K in air, involving the transfer of tungsten from FexMn1-xWO4 to water-soluble tungstate [1][2][3][4], has become widespread in the industrial practice of processing for tungstate concentrates.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of the Natural Wolframite Interaction with Sodium and Potassium Carbonates

Selivanov

Pikulin

Gulyaeva

et al. 2020

MSF

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The kinetics and mechanism of the natural wolframite interaction with sodium and potassium carbonate, when they are heated in the air, are studied. Using X-ray phase and X-ray structure microanalysis, it was established that the initial single crystal wolfram consists of Fe0.5Mn0.5WO4 and Fe0.3Mn0.7WO4. The method of differential thermal and subsequent phase analysis of products has shown that the interaction of wolframite with sodium and potassium carbonates begins above 450-470 °C with the formation of tungstate and ferrites of sodium and potassium, iron and manganese oxides. Conducting the model experiments on sintering with the subsequent removal of water-soluble compounds (alkalization) made it possible to follow the change in the structure of wolframite. Unit cells parameters of wolframites in solid products (cakes) of leaching do not change if sintering is carried out in the range up to 600 °С. In samples, the preparation of which is coupled with heating to 700–800 °C, the atomic ratio of Fe/Mn in wolframite decreases to 0.2. This allows to specify the mechanism of the process and judge the greater reactivity of wolframites with an increased proportion of iron. Thermal analysis with data processing using the methods of non-isothermal kinetics has established that the studied interactions proceed according to a two-stage mechanism, which in the first stage is limited by diffusion. The appearance of a low-melting eutectic Na2WO4 – Na2CO3 и K2WO4 – K2CO3 in the system contributes to the process transition to the autocatalytic mode.

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Section: Introductionmentioning

confidence: 99%

Kinetics of the Natural Wolframite Interaction with Sodium and Potassium Carbonates

Selivanov

Pikulin

Gulyaeva

et al. 2020

MSF

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Preparation of Tungsten Based Metal-Ceramic Alloys by the Plasma Chemical Synthesis from the Mineral Concentrate Mined in the Far Eastern Region

Kuzmichev

Николенко

Chigrin

2020

MSF

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s The paper considers the development of an alternative method for obtaining functional materials based on tungsten carbide and its compounds using simple and sufficiently productive equipment. This method will allow using mineral dumps as a raw material base, in addition, it gives an opportunity to obtain new compounds based on tungsten. Obtained during plasma-chemical synthesis, the WxCW alloy from a mixture based on a tungsten-containing concentrate has a two-phase composition consisting of carbides of the WxCW group and metallic tungsten. According to preliminary calculations, the content of the carbide phase in the alloy is 88% and depends on the plasma synthesis processes, on the concentrate composition, and on the introduced carburetor volume. The synthesis was carried out using tungsten-containing concentrates by treatment of high-density energies (g> 104 - 105 W/cm2) in an inert gas medium. The stage of plasma-chemical synthesis of the WxCW semi-finished product made it possible to obtain nanosized tungsten carbide crystals. This makes a possibility to synthesize a high-quality alloy with an ordered structure of the carbide phase during refinement and pressing. The carbide phase ordered structure contributed to an increase in the strength characteristics of the new refractory material.

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Production of functional materials on the basis of tungsten multicomponent mineral resources

Cited by 2 publications

References 9 publications

Kinetics of the Natural Wolframite Interaction with Sodium and Potassium Carbonates

Kinetics of the Natural Wolframite Interaction with Sodium and Potassium Carbonates

Preparation of Tungsten Based Metal-Ceramic Alloys by the Plasma Chemical Synthesis from the Mineral Concentrate Mined in the Far Eastern Region

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