C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
307/1
C03B 5/02 (2006.01) C21C 5/52 (2006.01) C23F 13/00 (2006.01) H05B 3/00 (2006.01) H05B 7/12 (2006.01)
Patent
CA 1048091
ABSTRACT OF THE DISCLOSURE The invention is directed to a method for protecting metal heating electrodes of melting furnaces against reduction of ions, particularly cations contained in a silicate melt, with DC current, which comprises connecting the positive pole of a source of DC current to the heating electrodes and the negative pole of said source of DC current to at least one auxiliary elect- rode, during melting by means of the DC current which is dependent on the temperature and composition of the melt and on the current density of an AC heating current producing and maintaining a passivation layer having a higher specific resistance than the resistance of the melt. The invention also relates to a device for protecting metal heating electrodes which comprises a melting furnace including a tank with heat resistant walls, heating elec- trodes and at least one auxiliary electrode, associated with said tank a source of AC current and a source of DC current, the heat- ing electrodes being connected to the source of AC current and to the positive pole of the source of DC current, the auxiliary electrode being connected to the negative pole of the source of DC current, the auxiliary electrode being made of a material, whose electrode potential in a given melt is more positive than the depositing potential of a cation capable of reduction from the melt,the absolute value of the difference between the depositing potential of the cation capable of reduction from the melt and between the electrode potential of the heating electrodes is smaller than the absolute value of the difference of the depositing potent- ial of the cation capable of reduction from the melt and of the electrode potential of the material of the auxiliary electrode.
225885
Habrman Zdenek
Ladr Ivan
Susser Vaclav
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