| 摘要 |
A cell for the electrowinning of aluminium by the electrolysis from an aluminium compound dissolved in a molten electrolyte ( 50 ), comprises: (I) a plurality of non-carbon anodes ( 10 ), each anode being suspended in operating in the molten electrolyte by an anode stem ( 11 ) that connects the anode ( 10 ) to a positive current source; and (II) a thermic insulating cover ( 60,60 ') which covers the electrolyte ( 50 ) and through which each anode stem ( 11 ) extends from the positive current source to an anode ( 10 ). The insulating cover ( 60,60 ') comprises a plurality of movable sections ( 60 ) that together cover a substantial part of the electrolyte ( 50 ). Each movable section ( 60 ) covers a corresponding portion of the electrolyte ( 50 ) that is located therebelow and that can be uncovered by moving the corresponding movable section ( 60 ). The anode stem ( 11 ) of each anode ( 10 ) extends through the insulating cover ( 60,60 ') between two movable sections ( 60 ) or between a movable section ( 60 ) and a fixed section ( 60 ') of the insulating cover ( 60,60 ') when the sections ( 60 ) are in a covering position over the electrolyte ( 50 ). Each movable section ( 60 ) is movable to uncover the corresponding electrolyte portion without interrupting operation of any anode ( 10 ), for example by tilting, in particular pivoting, or sliding and/or lifting the section ( 60 ).
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