1. Reasonable adjustment of feeding speed. The absorption rate of calcium is greatly affected by the feeding rate, too fast or too slow will reduce the absorption rate. When the ground core reaches a certain depth, the core begins to melt. It is necessary to ensure the melting and dispersion of calcium bubbles at depth, but also to withstand the large static pressure of steel, so that the calcium bubbles are completely consumed in advance.
2. Floating on the surface of steel. Reasonable dosage can improve the recovery of calcium. If the speed is too fast, on the one hand, a large amount of calcium vapor will be generated locally, so that the steel is stirred violently, and a large amount of calcium vapor is volatilized directly into the air. On the contrary, too much calcium vapor will float and not be dissolved, which will reduce the recovery rate of Baotou rare earth silicon alloy. On the contrary, the depth of complementary shrinkage is not enough, and it rises to the surface of the steel before it is completely dissolved in the steel, resulting in waste.
3. The feeding position should be accurate. The feeding method also has an important effect on calcium recovery. In the center of the downward flowing steel, should be as far away as possible from the blowing argon bright circle, so that Ca becomes gas or liquid. As Ca is a gas or liquid, it will be reduced when flowing downward, thus prolonging its residence time in the molten steel and being completely absorbed by the molten steel.
