ELECTROCHEMICAL PRODUCTION OF TUNGSTEN: STATUS AND PROSPECTS
An overview of studies of the electrochemical reduction of tungsten compounds of different composition in various reaction media is presented. It is shown that among the variety of existing scientific and technical methods for obtaining tungsten, there are attractive prospects for the creation and...
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| Date: | 2023 |
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| Language: | English |
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V.I.Vernadsky Institute of General and Inorganic Chemistry
2023
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| Online Access: | https://ucj.org.ua/index.php/journal/article/view/612 |
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oai:ojs2.1444248.nisspano.web.hosting-test.net:article-6122024-10-07T12:25:31Z ELECTROCHEMICAL PRODUCTION OF TUNGSTEN: STATUS AND PROSPECTS Medvezhynska, Olha Omelchuk, Anatoliy tungsten, electrochemical reduction, oxygen-containing compounds of tungsten, molten electrolyte mixtures. An overview of studies of the electrochemical reduction of tungsten compounds of different composition in various reaction media is presented. It is shown that among the variety of existing scientific and technical methods for obtaining tungsten, there are attractive prospects for the creation and development of a new industrial process that would ensure the direct electrochemical release of oxygen from its oxygen-containing compounds into molten mixtures based on chloride and calcium oxide. This scientific and technical solution is known in the literature as the FFC Cambridge process (FFC process).In contrast to the known methods of electrochemical reduction of tungsten compounds, this process allows the reduction of oxygen-containing tungsten compounds in the solid state and does not depend on the course of acid-base equilibria at the electrode/electrolyte phase separation boundary. The most favorable conditions for the reduction of oxygen-containing tungsten compounds are provided by electrolysis using a liquid gallium cathode in both galvanostatic and potentiostatic modes, and it is advisable to use the initial tungsten compounds in a finely dispersed state. The electrochemical reduction of tungsten trioxide in thee utectic melt of sodium and calcium chlorides occurs through the intermediate stage of calcium tungstate formation, so it is advisable to use CaWO4 instead of WO3 as the starting compound for reduction. Electrochemical reduction on a liquid gallium cathode in a molten eutectic mixture of sodium and calcium chlorides allows obtaining highly dispersed tungsten powder (11–35 nm) of high purity (99.9%) with a degree of extraction of at least 90.0% from both tungsten trioxide and from calcium tungstate. In addition, in this way it is possible to obtain not only pure tungsten, but also metal alloys and composites based on it. V.I.Vernadsky Institute of General and Inorganic Chemistry 2023-12-29 Article Article Physical chemistry Физическая xимия Фізична xімія application/pdf https://ucj.org.ua/index.php/journal/article/view/612 10.33609/2708-129X.89.11.2023.3-34 Ukrainian Chemistry Journal; Vol. 89 No. 11 (2023): Ukrainian Chemistry Journal; 3-34 Украинский химический журнал; Том 89 № 11 (2023): Ukrainian Chemistry Journal; 3-34 Український хімічний журнал; Том 89 № 11 (2023): Український хімічний журнал; 3-34 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/612/307 |
| institution |
Ukrainian Chemistry Journal |
| baseUrl_str |
|
| datestamp_date |
2024-10-07T12:25:31Z |
| collection |
OJS |
| language |
English |
| topic_facet |
tungsten electrochemical reduction oxygen-containing compounds of tungsten molten electrolyte mixtures. |
| format |
Article |
| author |
Medvezhynska, Olha Omelchuk, Anatoliy |
| spellingShingle |
Medvezhynska, Olha Omelchuk, Anatoliy ELECTROCHEMICAL PRODUCTION OF TUNGSTEN: STATUS AND PROSPECTS |
| author_facet |
Medvezhynska, Olha Omelchuk, Anatoliy |
| author_sort |
Medvezhynska, Olha |
| title |
ELECTROCHEMICAL PRODUCTION OF TUNGSTEN: STATUS AND PROSPECTS |
| title_short |
ELECTROCHEMICAL PRODUCTION OF TUNGSTEN: STATUS AND PROSPECTS |
| title_full |
ELECTROCHEMICAL PRODUCTION OF TUNGSTEN: STATUS AND PROSPECTS |
| title_fullStr |
ELECTROCHEMICAL PRODUCTION OF TUNGSTEN: STATUS AND PROSPECTS |
| title_full_unstemmed |
ELECTROCHEMICAL PRODUCTION OF TUNGSTEN: STATUS AND PROSPECTS |
| title_sort |
electrochemical production of tungsten: status and prospects |
| description |
An overview of studies of the electrochemical reduction of tungsten compounds of different composition in various reaction media is presented. It is shown that among the variety of existing scientific and technical methods for obtaining tungsten, there are attractive prospects for the creation and development of a new industrial process that would ensure the direct electrochemical release of oxygen from its oxygen-containing compounds into molten mixtures based on chloride and calcium oxide. This scientific and technical solution is known in the literature as the FFC Cambridge process (FFC process).In contrast to the known methods of electrochemical reduction of tungsten compounds, this process allows the reduction of oxygen-containing tungsten compounds in the solid state and does not depend on the course of acid-base equilibria at the electrode/electrolyte phase separation boundary. The most favorable conditions for the reduction of oxygen-containing tungsten compounds are provided by electrolysis using a liquid gallium cathode in both galvanostatic and potentiostatic modes, and it is advisable to use the initial tungsten compounds in a finely dispersed state. The electrochemical reduction of tungsten trioxide in thee utectic melt of sodium and calcium chlorides occurs through the intermediate stage of calcium tungstate formation, so it is advisable to use CaWO4 instead of WO3 as the starting compound for reduction. Electrochemical reduction on a liquid gallium cathode in a molten eutectic mixture of sodium and calcium chlorides allows obtaining highly dispersed tungsten powder (11–35 nm) of high purity (99.9%) with a degree of extraction of at least 90.0% from both tungsten trioxide and from calcium tungstate. In addition, in this way it is possible to obtain not only pure tungsten, but also metal alloys and composites based on it. |
| publisher |
V.I.Vernadsky Institute of General and Inorganic Chemistry |
| publishDate |
2023 |
| url |
https://ucj.org.ua/index.php/journal/article/view/612 |
| work_keys_str_mv |
AT medvezhynskaolha electrochemicalproductionoftungstenstatusandprospects AT omelchukanatoliy electrochemicalproductionoftungstenstatusandprospects |
| first_indexed |
2025-09-24T17:43:54Z |
| last_indexed |
2025-09-24T17:43:54Z |
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