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

Authors

DOI:

https://doi.org/10.15587/1729-4061.2021.225389

Keywords:

oxide tungsten concentrate, oxide, phase analysis, carbon-thermal reduction, carbide, doping

Abstract

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

Author Biographies

Viktor Ryndiaiev , Luhansk National Agrarian University

PhD

Department of Machine Repair, Energy Facilities Operation and Labor Protection

Oleksandr Kholodiuk, Vinnytsia National Agrarian University

PhD

Department of Agroengineering and Technical Service

Vasyl Khmelovskyi , National University of Life and Environmental Sciences of Ukraine

Doctor of Technical Sciences, Associate Professor, Head of Department

Department of Mechanization of Animal Husbandry

Artem Petryshchev, National University “Zaporizhzhya Polytechnic”

PhD, Associate Professor

Department of Labour and Environment Protection

Alyona Yushchenko, Donbass Institute of Technique and Management Private Higher Educational Establishment “Academician Yuriy Bugay Internationalscientific and Technical University”

Junior Researcher

Research Laboratory of Applied Materials Science

Hryhorii Fesenko, Luhansk National Agrarian University

PhD, Associate Professor

Department of Machine Repair, Energy Facilities Operation and Labor Protection

Yevhen Chaplyhin , Luhansk National Agrarian University

Lecturer

Department of Mechanization of Production Processes in Agroindustrial Complex

Vladimir Strelnikov, Luhansk National Agrarian University

PhD

Department of Machine Repair, Energy Facilities Operation and Labor Protection

Andrey Andreev, Zaporizhzhia National University

Doctor of Pedagogical Sciences, Associate Professor, Head of Department

Department of General and Applied Physics

Vasyl Matukhno, National University of Civil Defense of Ukraine

PhD

Department of Pyrotechnic and Special Training

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Published

2021-02-26

How to Cite

Ryndiaiev , V., Kholodiuk, O., Khmelovskyi , V., Petryshchev, A., Yushchenko, A. ., Fesenko, H. ., Chaplyhin , Y. ., Strelnikov, V. ., Andreev, A. ., & Matukhno, V. . (2021). Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon . Eastern-European Journal of Enterprise Technologies, 1(12 (109), 16–21. https://doi.org/10.15587/1729-4061.2021.225389

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Section

Materials Science