Cathodes for aluminum electrolysis cell with expanded graphite lining
AssigneeSgl Carbon SE
InventorsFrank Hiltmann, Martin Christ, Werner Langer, Oswin Öttinger
Life of this patent
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Abstract
Cathodes for aluminum electrolysis cells are formed of cathode blocks and current collector bars attached to those blocks. The cathode slots receiving the collector bar are lined with expanded graphite lining thus providing longer useful lifetime of such cathodes and increased cell productivity. The expanded graphite provides a good electrical and thermal conductivity especially with its plane layer.
Claims22
A cathode for an aluminum electrolysis cell, the cathode comprising:
- a cathode block, selected from the group consisting a carbon cathode block and a graphite cathode block, and having a collector bar slot formed therein;
- a steel-made current collector bar disposed in said collector bar slot;
- and
- an expanded graphite lining lining said collector bar slot.
A method of manufacturing cathodes for aluminum electrolysis cells, which comprises the steps of:
- manufacturing a cathode block, selected from the group consisting of a carbon cathode block and a graphite cathode block, and having a collector bar slot formed therein;
- lining the collector bar slot one of completely and partially with an expanded graphite lining;
- and
- fitting a steel collector bar to the cathode block with a cast iron layer.
A method of manufacturing cathodes for aluminum electrolysis cells, which comprises the steps of:
- manufacturing a cathode block, selected from the group consisting of a carbon cathode block and a graphite cathode block, and having a collector bar slot formed therein;
- lining the collector bar slot one of completely and partially with an expanded graphite lining;
- and
- fitting a steel collector bar into the cathode block.
A method of manufacturing cathodes for aluminum electrolysis cells, which comprises the steps of:
- manufacturing a cathode block, selected from the group consisting of a carbon cathode block and a graphite cathode block, and having a collector bar slot formed therein;
- lining a steel collector bar one of completely and partially with expanded graphite lining at surfaces facing the collector bar slot;
- and
- fitting the steel collector bar lined with the expanded graphite lining into the cathode block.
Aluminum electrolysis cells, comprising:
- a cathode containing:
- a cathode block, selected from the group consisting a carbon cathode block and a graphite cathode block, and having a collector bar slot formed therein;
- a steel-made current collector bar disposed in said collector bar slot;
- and
- an expanded graphite lining lining said collector bar slot.
Dependencies are inferred from the claim text.