EP 1112393 B1 20030312 - BIPOLAR CELL FOR THE PRODUCTION OF ALUMINIUM WITH CARBON CATHODES
Title (en)
BIPOLAR CELL FOR THE PRODUCTION OF ALUMINIUM WITH CARBON CATHODES
Title (de)
BIPOLARE ZELLE MIT KOHLENSTOFF-KATHODEN ZUR HERSTELLUNG VON ALUMINIUM
Title (fr)
CELLULE BIPOLAIRE A CATHODES AU CARBONE SERVANT A LA PRODUCTION D'ALUMINIUM
Publication
Application
Priority
- IB 9901438 W 19990817
- IB 9801283 W 19980818
Abstract (en)
[origin: WO0011243A1] A bipolar cell for the electrowinning of aluminium has bipolar electrodes each comprising a carbon cathode body having on one side an active surface on which aluminium is produced and connected on the other side through an oxygen impermeable barrier layer to an electrochemically active anode layer having an oxygen evolving iron oxide-based outer surface. The anode layer may comprise a metal-based anode substrate and a transition metal oxide-based outside layer, in particular an iron oxide-based outside layer, which either is an applied layer or is obtainable by oxidising the surface of the anode substrate which contains iron. During operation, the anode layer can be kept dimensionally stable by maintaining in the electrolyte a concentration of transition metal species which are present as one or more corresponding transition metal oxides in the electrochemically-active layer. The cell operating temperature is sufficiently low so that the required concentration of transition metal species in the electrolyte is limited by the reduced solubility thereof in the electrolyte at the operating temperature. This limits the contamination of the product aluminium by the transition metal species to an acceptable level.
IPC 1-7
IPC 8 full level
C25C 3/06 (2006.01); C25C 3/08 (2006.01); C25C 3/12 (2006.01)
CPC (source: EP US)
C25C 3/06 (2013.01 - EP US); C25C 3/08 (2013.01 - EP); C25C 3/12 (2013.01 - EP)
Designated contracting state (EPC)
CH DE ES FR GB LI
DOCDB simple family (publication)
WO 0011243 A1 20000302; AU 5187399 A 20000314; AU 760052 B2 20030508; CA 2339854 A1 20000302; DE 69905913 D1 20030417; DE 69905913 T2 20031218; EP 1112393 A1 20010704; EP 1112393 B1 20030312; NO 20010806 D0 20010216; NO 20010806 L 20010216
DOCDB simple family (application)
IB 9901438 W 19990817; AU 5187399 A 19990817; CA 2339854 A 19990817; DE 69905913 T 19990817; EP 99936904 A 19990817; NO 20010806 A 20010216