Blend composition comprising petroleum coke and pyrolytic carbon for electrodes
AssigneeBASF SE
InventorsFrederik Scheiff, Marc Leduc, Andreas Bode, Sabine Eichhorn, William Daloz, Julien Wyss
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Abstract
A blend composition including a mixture of (i) petroleum coke in a content of 20 to 99 weight-%; and (ii) pyrolytic carbon in a content of 1 to 80 weight-%, in view of the total weight of the blend composition, wherein the blend composition contains at least two particle size fractions: (i) granular above 0.5 mm and (ii) fines below 0.5 mm, and wherein pyrolytic carbon is at least present in the granular size fraction, an electrode recipe, and the use of the electrode as an anode in a process of making aluminum.
Claims21
An electrode blend composition, comprising:
- a mixture of
- (i) petroleum coke in a content of 20 to 99 weight-%;
- and
- (ii) pyrolytic carbon in a content of 1 to 80 weight-%, in view of the total weight of the blend composition,
- wherein the blend composition contains at least two particle size fractions:
- (i) granular above 0.5 mm and (ii) fines below 0.5 mm,
- wherein pyrolytic carbon is at least present in the granular size fraction,
- wherein said pyrolytic carbon is produced by decomposition of gaseous hydrocarbon compounds at a temperature of 1000 to 2500K and by deposition of said pyrolytic carbon on carbon granules,
- wherein said pyrolytic carbon has a crystal size in the range of 20 to 60 Å,
- wherein said pyrolytic carbon is present in the granular size fraction having a particle size of 4-2 mm and/or 8-4 mm, and
- wherein at least 50 weight-% of the total pyrolytic carbon of the blend composition is in the granular fraction.
A carbon electrode, suitable as an anode in an aluminum reduction cell, which comprises a blend composition comprising a mixture of (i) petroleum coke in a content of 20 to 99 weight-% and (ii) pyrolytic carbon in a content of 1 to 80 weight-%, in view of the total weight of the blend composition,
- wherein the blend composition contains at least two particle size fractions:
- (i) granular above 0.5 mm and (ii) fines below 0.5 mm, and
- wherein pyrolytic carbon is at least present in the granular size fraction,
- wherein said pyrolytic carbon is produced by decomposition of gaseous hydrocarbon compounds at a temperature of 1000 to 2500K and by deposition of said pyrolytic carbon on carbon granules,
- wherein said pyrolytic carbon has a crystal size in the range of 20 to 60 k,
- wherein said pyrolytic carbon is present in the granular size fraction having a particle size of 4-2 mm and/or 8-4 mm, and
- wherein at least 50 weight-% of the total pyrolytic carbon of the blend composition is in the granular fraction.
Dependencies are inferred from the claim text.