Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 11    November 2010

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Depolarised gas anodes for aluminium electrowinning
G. M. HAARBERG1, E. KVALHEIM1, A. P. RATVIK1, S. J. XIAO1, T. MOKKELBOST2

1. Department of Materials Science and Engineering,
Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway;
2. SINTEF Materials and Chemistry, NO-7465 Trondheim, Norway

Abstract:Consumable carbon anodes are used in the electrowinning of aluminium by the Hall-Heroult process. Emissions of CO2 may be eliminated by introducing an inert oxygen evolving anode, which however will require a higher anode potential. An alternative approach is to use a natural gas or hydrogen gas anode to reduce the CO2 emissions and lower the anode potential. Preliminary laboratory experiments were carried out in an alternative molten salt electrolyte consisting of CaCl2-CaO-NaCl at 680 °C. Porous anodes of platinum and tin oxide were tested during electrolysis at constant current. The behaviour of inert anode candidate materials such as tin oxide and nickel ferrite were also studied.

 

Key words: anodes; natural gas; aluminium electrowinning

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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