Nozzle filling sand, is a kind of bulk refractory material filled in ladle well block and upper nozzle. Put it into the ladle before the converter (or electric arc furnace) steel tapping, and release it when ladle steel tapping, play a role of steel guide.
Four common types of nozzle filling sand:
1. Magnesium olivine type nozzle filling sand;
2. Silica type nozzle filling sand;
3. Zirconium type nozzle filling sand;
4. Chromium type nozzle filling sand.
Nozzle filling sand as the ladle nozzle filling material, its main role is to guide the molten steel. The principle is that the upper surface of nozzle filling sand filled in the ladle nozzle forms a thin sintered layer under the heat of the molten steel. Once the slide gate plate is open, most of the unsintered sand in the nozzle are free to fall. And at the same time, the static pressure of molten steel crushed the sintered layer, molten steel automatically out.