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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.19 SNIP: 0.341 CiteScore™: 0.43

ISSN Print: 1093-3611
ISSN Online: 1940-4360

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

DOI: 10.1615/HighTempMatProc.v2.i4.50
pages 497-506

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

ABSTRACT

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.


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