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Operation of aluminium electrowinning cells having metal-based anodes
Operation of aluminium electrowinning cells having metal-based anodes
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机译:具有金属基阳极的铝电积电池的运行
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摘要
Disclosed is a method of inhibiting fluorination and passivation of a metal-based anode having an alloy outer portion made of iron with nickel and/or cobalt and covered with an integral oxide surface layer facing a cathode in an aluminium fluoride-comprising molten electrolyte. This method comprises maintaining an amount of at least one basic fluoride, such as calcium or lithium fluoride, in the electrolyte to reduce the acidic activity of aluminium fluoride thereby inhibiting fluorination, corrosion of iron and passivation of nickel and/or cobalt of the alloy outer portion.
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