How to deal with the silicon - calcium cored wire of converter
In the furnace refining, the solid core pure calcium line is generally used to replace the solid core calcium silicon line, why? Why make such a substitution? Let's look at the process in detail.
The reaction of solid core pure calcium wire with molten steel is more intense than that of silicon calcium wire. Therefore, attention should be paid to the operation of calcium treatment, such as feeding depth and feeding speed. During wire feeding operation, the solid core pure calcium wire must be fed deeply in order to prevent the natural evaporation of calcium because of the high calcium vapor pressure of the solid core pure calcium wire.
One method is to increase the thickness of the iron sheet to prevent its premature melting from affecting the release depth of calcium.
The other method is to increase the feeding rate to increase the depth of calcium release, the higher feeding rate makes the solid core pure calcium line can penetrate the slag layer and reach a certain depth, reduce the oxidation of slag to Ca, increase the absorption of molten steel to Ca, improve the recovery of Ca.
The feeding speed and the feeding rhythm are the key parameters of the feeding process of solid core pure calcium wire. Too fast or too slow feeding speed and the feeding rhythm will affect the melting time and oxidation degree of solid core pure calcium wire, which will affect the metallurgical effect.
The operator must pay strict attention to the situation of molten steel. Once the molten steel rolls violently, the operator must stop for a moment before continuing to feed the wire to prevent spilling.
Calcium silicate thread is treated by the same mechanism, but the chemical reaction is not so strong, so the operation of calcium silicate thread feeding is relatively easy.
