Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon
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 proce...
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doaj-4a6eb807e7c84eb59c5895cfd75820fd2021-03-11T15:43:41ZengPC Technology CenterEastern-European Journal of Enterprise Technologies1729-37741729-40612021-02-01112 (109)162110.15587/1729-4061.2021.225389262863Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbonViktor Ryndiaiev0https://orcid.org/0000-0002-0473-8059Oleksandr Kholodiuk1https://orcid.org/0000-0002-4161-6712Vasyl Khmelovskyi2https://orcid.org/0000-0002-6018-8821Artem Petryshchev3https://orcid.org/0000-0003-2631-1723Alyona Yushchenko4https://orcid.org/0000-0002-0143-3663Hryhorii Fesenko5https://orcid.org/0000-0001-9749-8746Yevhen Chaplyhin6https://orcid.org/0000-0001-7656-2681Vladimir Strelnikov7https://orcid.org/0000-0003-2623-8319Andrey Andreev8https://orcid.org/0000-0002-5390-6813Vasyl Matukhno9https://orcid.org/0000-0002-9713-7710Luhansk National Agrarian UniversityVinnytsia National Agrarian UniversityNational University of Life and Environmental Sciences of UkraineNational University “Zaporizhzhya Polytechnic”Donbass Institute of Technique and Management Private Higher Educational Establishment “Academician Yuriy Bugay Internationalscientific and Technical University”Luhansk National Agrarian UniversityLuhansk National Agrarian UniversityLuhansk National Agrarian UniversityZaporizhzhia National UniversityNational University of Civil Defense of UkraineThis 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 elementhttp://journals.uran.ua/eejet/article/view/225389oxide tungsten concentrateoxidephase analysiscarbon-thermal reductioncarbidedoping |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Viktor Ryndiaiev Oleksandr Kholodiuk Vasyl Khmelovskyi Artem Petryshchev Alyona Yushchenko Hryhorii Fesenko Yevhen Chaplyhin Vladimir Strelnikov Andrey Andreev Vasyl Matukhno |
spellingShingle |
Viktor Ryndiaiev Oleksandr Kholodiuk Vasyl Khmelovskyi Artem Petryshchev Alyona Yushchenko Hryhorii Fesenko Yevhen Chaplyhin Vladimir Strelnikov Andrey Andreev Vasyl Matukhno Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon Eastern-European Journal of Enterprise Technologies oxide tungsten concentrate oxide phase analysis carbon-thermal reduction carbide doping |
author_facet |
Viktor Ryndiaiev Oleksandr Kholodiuk Vasyl Khmelovskyi Artem Petryshchev Alyona Yushchenko Hryhorii Fesenko Yevhen Chaplyhin Vladimir Strelnikov Andrey Andreev Vasyl Matukhno |
author_sort |
Viktor Ryndiaiev |
title |
Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon |
title_short |
Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon |
title_full |
Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon |
title_fullStr |
Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon |
title_full_unstemmed |
Establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon |
title_sort |
establishing patterns of the structural-phase transformations during the reduction of tungsten-containing ore concentrate with carbon |
publisher |
PC Technology Center |
series |
Eastern-European Journal of Enterprise Technologies |
issn |
1729-3774 1729-4061 |
publishDate |
2021-02-01 |
description |
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 |
topic |
oxide tungsten concentrate oxide phase analysis carbon-thermal reduction carbide doping |
url |
http://journals.uran.ua/eejet/article/view/225389 |
work_keys_str_mv |
AT viktorryndiaiev establishingpatternsofthestructuralphasetransformationsduringthereductionoftungstencontainingoreconcentratewithcarbon AT oleksandrkholodiuk establishingpatternsofthestructuralphasetransformationsduringthereductionoftungstencontainingoreconcentratewithcarbon AT vasylkhmelovskyi establishingpatternsofthestructuralphasetransformationsduringthereductionoftungstencontainingoreconcentratewithcarbon AT artempetryshchev establishingpatternsofthestructuralphasetransformationsduringthereductionoftungstencontainingoreconcentratewithcarbon AT alyonayushchenko establishingpatternsofthestructuralphasetransformationsduringthereductionoftungstencontainingoreconcentratewithcarbon AT hryhoriifesenko establishingpatternsofthestructuralphasetransformationsduringthereductionoftungstencontainingoreconcentratewithcarbon AT yevhenchaplyhin establishingpatternsofthestructuralphasetransformationsduringthereductionoftungstencontainingoreconcentratewithcarbon AT vladimirstrelnikov establishingpatternsofthestructuralphasetransformationsduringthereductionoftungstencontainingoreconcentratewithcarbon AT andreyandreev establishingpatternsofthestructuralphasetransformationsduringthereductionoftungstencontainingoreconcentratewithcarbon AT vasylmatukhno establishingpatternsofthestructuralphasetransformationsduringthereductionoftungstencontainingoreconcentratewithcarbon |
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