Drainage Sand Has Good Natural Fluidity And Low Thermal Expansion Tendency

Drainage sand used in the ladle drainage of raw material ratio requirements

Drainage sand is a kind of filling material at the bottom of the ladle prepared by combining and mixing forsterite and fused magnesia as the main raw materials according to specific particle size and weight percentage. The composition of raw materials in this material is as follows

The drainage sand made of the above-mentioned raw materials by the drainage sand manufacturer does not react chemically with molten steel and alloy components, and the storage quality is invariable. It can meet various requirements of the steelmaking process and is an ideal refractory material for making eccentric furnace steelmaking.

Drainage sand is an indispensable refractory material for eccentric furnace tapping. Industrial production has continuously increased its requirements, and it is required to enable automatic ladle pouring. What is the reason for using the drainage sand to open the ladle?

If the ladle nozzle can not be opened automatically, it must be treated by oxygen burning and drainage. At this time, oxygen will directly enter the ladle and undergo oxidation reaction with the treated pure molten steel, generating a large amount of oxidation products and polluting the molten steel. Furthermore, if the drainage time is long and the tundish molten steel cannot be replenished, low-level pouring will cause the tundish molten steel slag and pulling speed to fluctuate, directly jeopardizing the quality of the product, and in serious cases may cause the production line to be interrupted. Therefore, the drainage sand should have good natural fluidity and small thermal expansion tendency. After contact with the molten steel, a dense sintered layer is quickly formed at the interface of the steel sand to prevent the penetration of the molten steel, and the strength of the drainage sand after sintering is low, which can be The static pressure of the liquid breaks through to achieve the effect of natural pouring.

The drainage sand is in a high temperature state for a long time at the ladle nozzle, which requires a high refractory degree of the sintered layer; 2. Directly contact with the molten steel after filling the nozzle, the initial sintering temperature should not be too high; 3. In the use process, withstand a large molten steel static Pressure, in order to prevent bandage, requires very good fluidity, the friction between the particles is as small as possible; 4. At high temperatures, to prevent automatic fall during use or can not effectively support the upper material.