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Product DE. A

PATENT ASSIGNEE'S COUNTRY Germany
UPDATE 10.00
PATENT ASSIGNEE This data is not available for free
PATENT CLAIMS Formed from steel pots for use in primary production & sec. refining as a layer of heat insulating refractory underlying a bottom C electrode, comprising a monolithic stamping of unfired shaped elements of a finely granulated powder having a high alumina content, said stamping formed under a pressure of 600 bar, said powder obtained from Al scrap recovery & salt slags & having the following comp in the following amounts based on dried wt.:
- Al2O3 (40-90%)
- AlN (0.1-25%)
- MgO (4-20%)
- Silica (0.5-15%)
- CaO (0.1-15%)
- Al (0.1-10%)
- Si (0.1-10%)
- Fe2O3 (0.1-5%)
- C (< 5%)
- F (< 5%)
- Na2O (0.1-5%)
- K2O (0.1-2%)
- TiO2 (0.1-2%)
- Others (< 5%)
- Loss on ignition (< 10%)
Said shaped elements in the form selected from: pellets, briquetes & normal shaped bricks & being thermally treated to < 5% annealing loss, & said monolithic stamping having a final particle size & distribution that causes the stamping to be resistant to 100% infiltration by electrolyte melt
PATENT PHOTOCOPY Available on request

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