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US 2021/0277526 A1Published application
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 contains a mixture of petroleum coke and pyrolytic carbon. An electrode recipe, and the use of this electrode as an anode in the process of producing aluminum are described.
Claims16
1:
- 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.
5 more elements
2:
- The blend composition of claim 1, wherein the content of said petroleum coke is of 70 to 95 weight-% and the content of said pyrolytic carbon is of 5 to 30 weight-%, in view of the total weight of the blend composition.
3:
- The blend composition of claim 1, wherein at least 30 weight-% of the total pyrolytic carbon of the blend composition is in the granular fraction.
4:
- The blend composition of claim 1, wherein at least 70 weight-% of the total pyrolytic carbon of the blend composition is in the granular fraction.
5:
- The blend composition of claim 1, wherein said blend composition contains at least three particle size fractions:
- (i) coarse above 4 mm, (ii) intermediate between 4 and 0.5 mm, and (iii) fines below 0.5 mm, and
- wherein pyrolytic carbon is at least present in the intermediate fractions and/or in the coarse fractions.
6:
- The blend composition of claim 5, wherein at least 30 weight-% of the total pyrolytic carbon of the blend composition is in the intermediate size fraction.
7:
- The blend composition of claim 1, wherein
- a density of said pyrolytic carbon is in the range of 1.8 to 2.2 g/cc.
8:
- The blend composition of claim 1, wherein a crystallite size of said pyrolytic carbon is in the range of 30 to 50 Å.
9:
- The blend composition of claim 1, wherein the petroleum coke comprises calcined petroleum coke and wherein a sulfur content is in the range 1.5 to 7.0 weight % in view of a total weight of the petroleum coke.
10:
- A method of making the blend composition of claim 1, the method comprising:
- mixing the pyrolytic carbon and the petroleum coke.
11:
- An electrode recipe, comprising:
- a mixture of the blend composition of petroleum coke and pyrolytic carbon according to claim 1, (ii) butts and/or scrap, and (iii) a binder material.
12:
- The electrode recipe of claim 11, wherein 35 to 95 weight-% of the total weight of the electrode recipe is the blend composition, 0 to 40 weight-% of the total weight of the electrode recipe are the butts and/or scraps, and 5 to 25 weight-% of the total weight of the electrode recipe is the binder.
13:
- A method of making the electrode recipe of claim 11, the method comprising:
- preheating said blend composition and the butts and/or scraps, and
- mixing said preheated mixture with a binder.
14:
- 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) tines below 0.5 mm, and
- wherein pyrolytic carbon is at least present in the granular size fraction.
1 more element
15:
- A method of making a carbon electrode, suitable as an anode in an aluminum reduction cell, the method comprising:
- mixing the blend composition according to claim 1 with butts and/or scrap and a binder material at an elevated temperature to form a paste, and
- baking said solid body at an elevated temperature to form the carbon electrode.
16:
- A method of making aluminum, comprising:
- electrolyzing aluminum oxide in an aluminum reduction cell comprising the carbon electrode according to claim 14 as a carbon anode.