Brief introduction of electrode paste (2)
The development history of the self-baking electrode, also known as soderbergh motor, can be traced back to 1909, when the Norwegian engineer soderbergh made such an experiment, put the unroasted carbon material in an electric furnace, using the joule heat of the input current and the radiant heat on the surface of the furnace to roast, the results of the successful self-baking electrode.
The self-baking electrode is composed of the electrode tube and its inner electrode paste. The electrode tube is made of rolled and welded steel plate, with fins and iron bars, which can transfer current and increase the click intensity.
The problem of separation between electrode paste and electrode barrel is solved by the stiffening bar and the hole in the cross section of the electrode barrel, which makes the connection between electrode copper and electrode paste more solid and facilitates the current conduction.
The electrode barrel is installed in the electrode holder and extends to the reaction zone in the furnace through the electrode clamping device.
The electrode is constantly consumed while working in the furnace, so constantly lower the electrode, fill the electrode paste and weld the new electrode barrel.
The electrode paste is loaded into the electrode barrel and moves down at the same time with the electrode barrel, continuously consuming and continuously replenishing. In this process, the electrode paste has to go through three phase changes, that is, solid-liquid-solid.
In greenhouse (25 ℃) electrode paste is solid, when the temperature from 25 ℃ up to 120-250 ℃, the electrode paste melt into thin paste, resistance to increase at the same time, the temperature rose to 300-750 ℃, the electrode paste in the volatile substances volatile and gradually become stiff, coking substances, resistance became smaller, when the temperature reached 800-900 ℃, the basic burn as electrode, electrode paste electrode paste in the process of the transformation of roasting for electrodes, the intensity gradually increased, and the resistivity gradually reduced to less than 100 mu Ω · m.
After above 1000 ℃ high temperature roasting, electrode paste completely carbonized into carbon electrodes, in -arc furnace molten pool have the effect of conductive and conversion of energy, because the welding electrode tube without power case, electrode paste is without power to join, electrode consumption continuously, continuous roasting and electrode paste electrode formation, it is called a continuous automatic roasting electrodes, hereinafter referred to as self baking electrode.
The self-baking electrode is widely used in calcium carbide furnace and ferroalloy furnace. The diameter of this electrode can be increased to 2m, which creates favorable conditions for the application of large load capacity of ore furnace.
