⒈Coke addition amount
Coke is more conductive than silicon. If too much coke is added, it will affect the deep insertion of the electrode. Therefore, under the condition that the carbon dioxide in the silica is fully reduced, do not add too much coke to facilitate electrode insertion.
⒉Coke particle size
The particle size of coke is small, the surface area is increased, and the contact surface is increased. The resistance of the charge is large, and the insertion depth of the electrode becomes deep. On the contrary, the particle size of coke is large, the surface area is reduced, and the resistance of the charge is small, the insertion depth of the electrode becomes shallow.
⒊Coke properties
This mainly refers to the resistance of coke itself. If the resistance of the coke is small, the current passing through the charge is large, causing the electrode to rise, and the insertion depth of the electrode is shallow. On the contrary, the resistance of coke is high, such as using gas coke. Because of its high resistance, the electrode can be inserted deeply.
⒋Secondary voltage
When a higher secondary voltage is used for smelting, the arc is longer and the electrode is inserted shallowly into the charge. On the contrary, with a lower secondary voltage, the electrode is inserted deeper into the charge.
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⒌Operating conditions
If the operation is improper, such as uneven mixing, partial addition of materials, and failure to stir the furnace in time. The furnace condition is sticky, the material level is too high or there is a lack of material in the furnace, etc., which will hinder the depth and stability of the electrode insertion into the furnace material.
⒍Iron tapping time
Under normal conditions of the furnace, if the tapping interval is extended or the molten iron is not clean, there will inevitably be more molten iron accumulated in the furnace, the electrode will rise, and the electrode will be inserted shallowly into the charge.
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⒎The amount of slag accumulated in the furnace
If the slag discharge is not good, there will be too much slag accumulated in the furnace, the furnace bottom will rise, and the insertion depth of the electrode will become shallow.
⒏The diameter of the polar center circle between electrodes
For a submerged arc furnace with the same capacity, when the diameter of the pole center circle is larger, the distance between the electrodes is farther, the resistance of the charge increases, and the electrode is inserted deeper into the charge. On the contrary, when the diameter of the pole center circle is smaller, the insertion depth of the electrode becomes shallower.
