Carbon paste and process for its manufacture

Details Carbon paste and process for its manufacture Carbon paste and process for its manufacture

C - Chemistry, Metallurgy

04

B

204/198, 261/25

C04B 35/52 (2006.01) C04B 35/532 (2006.01) C25C 3/12 (2006.01)

Patent

CA 1227503

ABSTRACT A carbon paste for self-calcining electrodes, refractory linings and connections of electrode joining points con- tains as binder bitumen comprising 70-90 wt-% hard bitumen and 10-30 wt-% soft bitumen. To increase the dry residue of the bitumen and to improve the burning-off properties of the mass, 0.3-2 wt-% of additives can be added, in particu- lar Al, Al2O3, B, B2O3, Si and/or SiO2. The production of the carbon paste is such that the solid fraction is mixed at 130-180°C to a homogeneous mass then the hart bitumen, followed by the soft bitumen added slowly in a highly fluid form accompanied by intensive stirring. The paste is then intensively mixed further and, after re- moving from the mixer, cooled. - 1635 -

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