Depolarised gas anodes for aluminium electrowinning
来源期刊：中国有色金属学报(英文版)2010年第11期
论文作者：G. M. HAARBERG E. KVALHEIM A. P. RATVIK S. J. XIAO T. MOKKELBOST
文章页码：2152 - 2154
Key words：anodes; natural gas; aluminium electrowinning
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.
