SU385515A1 - Method of slag bath heating - Google Patents

Description

one

The invention relates to special electrometallurgy.

There is a method of heating the slag bath using an electroslag process with two non-consumable 5 electrodes. As one of the electrodes, a metal cooled (solid) electrode, for example, a copper one, is used.

The disadvantage of this method is its low efficiency, as well as the contamination of the slag bath with impurities of the material of the cooled electrode. These phenomena are due to the low resistance of electrodes of this type, which are subject to erosion destruction of 15 in slag melts, the intensity of which increases with increasing voltage and current density. The consumption of a water-cooled copper electrode, for example, at a voltage of 20 V (current density of 19 A / cm in slags based on CaR is 0.75. With a decrease in voltage (to 26-30 V), the erosion intensity can be reduced, However, the contamination of the slag bath with the metal of the electrode significantly exceeds the permissible value. The reduced electrical parameters of the process determine the low efficiency of its use.

The use of protecting the electrode from erosion by blowing it with a protective gas, such as argon, is not very efficient and requires considerable complication of the electrode design and process technology.

The aim of the invention is to improve the efficiency of the slag bath heating process using a solid cooled electrode by increasing the resistance of the electrode and ensuring its efficiency for the conditions of a more powerful electroslag process (for example, for the level of process modes with consumable electrodes).

To this end, it has been proposed to maintain the temperature at the slag-contacting surface of the electrode in the interval from 0.595 slag melting temperature to 0.995 melting temperature of the electrode metal.

The drawing shows a diagram of a method for heating a slag bath using a solid cooled electrode, whose heat removal exceeds the amount of heat sink allowed to maintain the electrical conductivity of the slag on the contact surface eto with the cooled wall of the electrode. .

The scheme includes a power supply source I, a solid-liquid metal electrode 2, a layer 3 of solidified slag (skull), a cooled melting device 4, a slag bath 5, a solid metal electrode 6, a device 7. cooling the electrode. The dotted line shows the passage of current between solid (cooled) and solid-liquid electrodes. The drawing shows schematically the erosion destruction of a solid electrode, for example, water-cooled copper, by arc discharges through a layer of hardened slag.

In order to prevent the destruction of the cooled (solid) electrode by arc discharges, it is made such that, due to the above conditions of the heat sink, it is made direct electrical contact with the liquid slag during the whole process. The method of heating the slag bath using an electroslag process with a non-consumable cooled (solid) electrode, whose heat sink maintains the electrical conductivity of the slag over the entire contact surface with the electrode at different intensity of the electrode surface in contact with the cooler, includes pouring the liquid slag into the cooled device with non-consumable electrodes, of which at least one is solid cooled, for example copper with water cooling . Voltage is applied to the electrodes before or at the time of slag washing.

Claims (1)

Invention Formula The method of heating a donkey bath with electric current by non-consumable cooled metal electrodes with a melting point of not less than 0.6 of the melting point of the shpak used, characterized in that the temperature of the contacting with the slag the electrode surfaces are kept in the range of 0.595 slag melting temperature to 0.995 electrode metal melting temperature. 7 ff