Depolarised gas anodes for aluminium electrowinning

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 ano...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2010-11, Vol.20 (11), p.2152-2154
Main Authors: HAARBERG, G.M., KVALHEIM, E., RATVIK, A.P., XIAO, S.J., MOKKELBOST, T.
Format: Article
Language:English
Subjects:
Aluminium
aluminium electrowinning
Aluminum
Anodes
Carbon
Carbon dioxide
China
Electrowinning
Natural gas
Tin oxides
二氧化碳排放量
惰性阳极
电解过程
阳极氧化
阳极电位
阳极电解
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Summary: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℃ 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.
ISSN:1003-6326
DOI:10.1016/S1003-6326(09)60434-9