- PII
- 10.31857/S0235010625030016-1
- DOI
- 10.31857/S0235010625030016
- Publication type
- Article
- Status
- Published
- Authors
- Volume/ Edition
- Volume / Issue number 3
- Pages
- 181-191
- Abstract
- One of the ways to increase the efficiency of aluminum production is the use of low-temperature electrolytes and the production of demand aluminum master alloys. Earlier it was noted that it is effective to obtain aluminium master alloys via electrolysis of low-temperature electrolytes, allowing to arrange production without the need to obtain individual alloying elements and aluminium. It is relevant both from the practical and scientific point of view is the study of the possibility of obtaining aluminium master alloys with such electronegative elements as scandium, yttrium, strontium and calcium, etc. In this paper, the possibility of obtaining the Al-Y master alloy during electrolysis of a low-temperature electrolyte based on the KF-AlF system with the addition of YO at a temperature of 800C was studied. For this purpose, the kinetics of the cathode process on a molybdenum and glassy carbon electrode was studied in the melt under study with different oxide content using chronovoltammetry method. It is shown that the addition of YO practically does not affect the voltampere dependences and the mechanism of the process, increasing the cathodic currents of reduction of aluminium and yttrium ions, as well as the anodic currents of oxidation of cathodic reaction products. Based on electrochemical measurements, it was assumed that the co-reduction of aluminum with yttrium is possible at current densities above 0.4-0.5 A/cm. The process of obtaining Al-Y alloys in the KF-NaF-AlF melt with the addition of 1 wt% YO under conditions of aluminothermic synthesis and galvanostatic electrolysis of the melt at a cathodic current density of 0.5 and 1.0 A/cm was studied. As a result of aluminothermic reduction, an alloy with an yttrium content of no more than 0.07 wt.% was obtained, while during electrolysis, Al-Y master alloys with an yttrium content from 0.75 to 1.28 wt.% were obtained. The obtained values correspond to the extraction of yttrium from its oxide of 4.4; 47.5 and 81.3. It is suggested that the increase of synthesis duration and periodic loading of YO into the melt will allow to obtain Al-Y master alloys with increased yttrium content.
- Keywords
- электролиз алюминия низкотемпературный электролит лигатура Al-Y вольтамперометрия электролиз извлечение
- Date of publication
- 23.04.2025
- Year of publication
- 2025
- Number of purchasers
- 0
- Views
- 12
References
- 1. Li X., Lin J., Liu C., Liu A., Shi Z., Wang Z., Jiang S., Wang G., Liu F. Research on aluminum electrolysis from 1970 to 2023: A bibliometric analysis // JOM. 2024. 76. 3265-3274.
- 2. Aarhaug T.A., Ratvik A.P. Aluminium primary production off-gas composition and emissions: An overview // JOM. 2019. 71. 2966-2977.
- 3. Padamata S.K., Singh K., Haarberg G.M., Saevarsdottir G., Review-Primary production of aluminium with oxygen evolving anodes // J. Electrochem. Soc. 2023. 170. 073501.
- 4. Катаев А.А., Каримов К.Р., Чернов Я.Б., Кулик Н.П., Малков В.Б., Антонов Б.Д., Вовкотруб Э.Г., Зайков Ю.П. Смачивание низкоплавким криолитом и жидким алюминием боридных катодных покрытий // Расплавы. 2009. № 6. 62-68.
- 5. Яценко С.П., Овсянников Б.В., Ардашев М.А., Сабирзянов А.Н. Цементационное получение «мастер-сплава» из фторидно-хлоридных расплавов // Расплавы. 2006. №5. 29-36.
- 6. Ткачева О.Ю., Катаев А.А., Редькин А.А., Руденко А.В., Дедюхин А.Е., Зайков Ю.П. Флюсы для получения сплавов алюминий-бор // Расплавы. 2016. № 5. 387-396.
- 7. Москвитин В.И., Махов С.В. О возможности получения алюминиево-скандиевой лигатуры в алюминиевом электролизере // Цветные металлы. 1998. № 7. 43-46.
- 8. Нерубащенко В.В., Крымов А.П., Галочка В.Г., Напалков В.И., Тарарышкин В.И. Получение алюминиевых лигатур в электролизных ваннах // Цветные металлы. 1980. №12. 47-48.
- 9. Суздальцев А.В., Филатов А.А., Николаев А.Ю., Панкратов А.А., Молчанова Н.Г., Зайков Ю.П. Извлечение скандия и циркония из их оксидов при электролизе оксидно-фторидных расплавов // Расплавы. 2018. №1. 5-13.
- 10. Суздальцев А.В., Николаев А.Ю., Зайков Ю.П. Обзор современных способов получения лигатур Al-Sc // Цветные металлы. 2018. №1. 69-73.
- 11. Бажин В.Ю., Косов Я.И., Лобачева О.Л., Джевага Н.В. Синтез скандиево-иттриевых лигатур на основе алюминия // Металлы. 2015. № 4. 9-14.
- 12. Меньшикова С.Г., Ширинкина И.Г., Бродова И.Г., Бражкин В.В. Структура сплава Al90Y10 при кристаллизации под давлением // Расплавы. 2019. № 1. 18-23.
- 13. Гилев И.О., Шубин А.Б., Котенков П.В. Термодинамические свойства расплавов бинарной системы Al-Y // Расплавы. 2021. № 5. 469-481.
- 14. Rudenko A.V., Tkacheva O.Y., Kataev A.A. Low-temperature electrolytic production of aluminum-REM alloys in cryolite melts // Rus. Metall. 2023. 1069-1075.
- 15. Николаев А.Ю., Ясинский А.С., Суздальцев А.В., Поляков П.В., Зайков Ю.П. Вольтамперометрия в расплаве и суспензиях KF-AlF3-Al2O3 // Расплавы. 2017. №3. 214-225.
- 16. Wei Z., Peng J., Wang Y., Liu K., Di Y., Sun T. Cathodic process of aluminum deposition in NaF-AlF3-Al2O3 melts with low cryolite ratio // Ionics. 2019. 25. 1735-1745.
- 17. Суздальцев А.В., Храмов А.П., Зайков Ю.П. Углеродный электрод для электрохимических исследований в криолит-глиноземных расплавах при 700 - 960°С // Электрохимия. 2012. 48. 1251-1263.
- 18. Rudenko A.V., Tkacheva O.Yu. Dynamic viscosity of KF-NaF-AlF3 cryolite melts with Sc2O3 and Y2O3 additions // Rus. Metall. 2024. 233-238.
- 19. Ambrova M., Jurisova J., Danielik V., Gabcova J. On the solubility of lanthanum oxide in molten alkali fluorides // J. Therm. Anal. Calorim. 2008. 91. 569-573.
- 20. Liu Sh., Du Y., Chen H. A thermodynamic reassessment of the Al-Y system // Computer Coupling of Phase Diagrams and Thermochemistry. 2006. 30. 334-340.
