Electrode composition
AssigneeRheinfelden Carbon GmbH & Co. KG
InventorsAlois J. Franke, Robert Becker, Johann Leye
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Abstract
The present invention relates to a self-calcining electrode material for electric arc furnaces, containing one or more carbon components and a binder, wherein the binder is hard bitumen and having a needle penetration at 25° C. according to DIN EN 1426 of <50 [per 0.1 mm] and/or a softening point (ring and ball) according to DIN EN 1 427 of at least 65° C. and/or having a density at 25° C. according to DIN EN 52004 of 0.5 to 2 g/cm3, wherein the electrode material has a PAH content of <500 ppm. The hard bitumen is preferably derived by flash distillation from soft and medium-hard bitumen types and has a high sulfur content.
Claims29
A self-calcining electrode composition for electric arc furnaces, comprising one or more carbon components and a binder,
- wherein the binder contains exclusively hard bitumen with a needle penetration of <50 per 0.1 mm at 25° C. according to DIN EN 1426, a softening point, ring and ball, of at least 65° C. according to DIN EN 1427, a density of 0.5 to 2 g/cm3 at 25° C. according to DIN EN 52004, or any combination thereof, and
- wherein the electrode composition has a polyaromatic hydrocarbon (PAC) content of <500 ppm.
A method for producing a self-calcining electrode composition, comprising the steps of mixing one or more carbon components, a binder and optionally additives, shaping the mixture into a predetermined shape, wherein exclusively hard bitumen is used as the binder with a needle penetration of 50 per 0.1 mm at 25° C. according to DIN EN 1426, a softening point, ring and ball, of at least 65° C. according to DIN EN 1427, a density of 0.5 to 2 g/cm3 at 25° C. according to DIN EN 52004, or any combination thereof.
Dependencies are inferred from the claim text.