| 摘要 |
<p>A carbon paste for self-calcining electrodes, refractory linings and connections of electrode joining points contains 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 particular 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.degree.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 removing from the mixer, cooled.</p> |
