Chemical and Electrochemical Behaviour of Titanium Oxide and Complexes in Cryolite-Alumina Melts

doi:10.1615/HighTempMatProc.v2.i4.50

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

Главный редакторs: Valiantsin M. Astashynski (open in a new tab) Andrey V. Gusarov (open in a new tab)

Ассоциированный редактор: Nikolai N. Cherenda (open in a new tab)

Выходит 4 номеров в год

ISSN Печать: 1093-3611

ISSN Онлайн: 1940-4360

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Chemical and Electrochemical Behaviour of Titanium Oxide and Complexes in Cryolite-Alumina Melts

Том 2, Выпуск 4, 1998, pp. 497-506

DOI: 10.1615/HighTempMatProc.v2.i4.50

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Краткое описание

In the present paper the possibility of in-situ production of aluminium-titanium alloys in aluminium electrolysis cells is discussed. Thermodynamic calculations showed, that TiO₂ is reduced to lower titanium oxides both by carbon anode and aluminium cathode, leading to the passivation of both the electrode surfaces. CaTi0₃ was found to be the best form to introduce TiO₂ into the melt, preventing passivation of electrodes. Linear voltammetry experiments proved, that in cryolite-alumina melt with TiO₂ addition the process is taking place in 2 steps: Ti(IV)+ e → Ti(III) + 3e→ Ti(0), while with addition of MgTi0₃ or CaTi0₃ deposition of Ti takes place in one irreversible step: Ti(IV) + 4e → Ti(0). Finally CaTi0₃ dissolved in the cryolite-alumina melts is suggested to be the best candidate to produce aluminium-titanium alloys from the aluminium electrolysis cells.

Ключевые слова: aluminium-titanium alloys, aluminium electrolysis cells, voltammetry, cryolite melts, CaTiO₃

ЦИТИРОВАНО В

Jentoftsen Trond E., Lorentsen Odd-Arne, Dewing Ernest W., Haarberg Geir M., Thonstad Jomar, Solubility of some transition metal oxides in cryolite-alumina melts: Part II. Solubility of TiO2, Metallurgical and Materials Transactions B, 33, 6, 2002. Crossref
Haarberg Geir Martin, Electrochemical Behaviour of Dissolved Titanium Oxides during Aluminium Deposition from Molten Fluoride Electrolytes, MATERIALS TRANSACTIONS, 58, 3, 2017. Crossref
Awayssa Omar, Saevarsdottir Gudrun, Meirbekova Rauan, Haarberg Geir Martin, Electrodeposition of aluminium-titanium alloys from molten fluoride-oxide electrolytes, Electrochemistry Communications, 123, 2021. Crossref
Leosson Kristjan, Padamata Sai Krishna, Meirbekova Rauan, Saevarsdottir Gudrun, Gudmundsson Sveinn Hinrik, Analysis of dissolved titanium concentration and phase transformation in molten Al Ti alloy using laser-induced breakdown spectroscopy, Spectrochimica Acta Part B: Atomic Spectroscopy, 190, 2022. Crossref
Haarberg Geir Martin, Awayssa Omar, Saevarsdottir Gudrun, Meirbekova Rauan, Xu Wenting, Direct Production of Aluminum Titanium Alloys in Aluminum Reduction Cells: A Laboratory Test, in Light Metals 2022, 2022. Crossref
Reddy Ramana G., Shinde Pravin S., Liu Aimin, Review—The Emerging Technologies for Producing Low-Cost Titanium, Journal of The Electrochemical Society, 168, 4, 2021. Crossref

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