Development and reference formula and construction technology of dry materials for tundish

With the tremendous development of world steel production technology, the tundish metallurgical process has been formed. The tundish has transformed from a simple molten steel transition vessel in the continuous casting system to a refining device with multiple refining functions. The tundish refining technology has also become a clean steel production. One of the important technologies.
The tundish working lining is in direct contact with molten steel, so it must meet the following requirements: 1) It has good slag erosion resistance and slag penetration resistance, 2) It has good high temperature performance, high refractoriness and certain high temperature strength. It should have good chemical stability under high temperature working conditions, and it should not cause secondary oxidation and pollution with molten steel; 3) It needs to have good thermal shock resistance and volume stability; 4) It has a lower thermal conductivity and is more Good insulation performance. And the material of the working lining of the tundish needs to be simple in construction, can be baked quickly or can be put into use directly without baking, and it is easy to separate from the permanent layer when it is removed, reducing the damage to the permanent lining of the tundish and so on.
Tundish dry material is an unshaped refractory material (tundish working lining) made by vibration molding without adding water and liquid binder. The dry material is dense and uniform, and the demoulding strength is generated after low temperature heating. The tundish working lining made of tundish dry materials has been widely used in major steel plants because of its convenient construction, short baking time, good slag resistance, good insulation effect, low energy consumption, and simple construction equipment. .
About the construction technology of dry materials in the tundish
The dry material of the tundish adopts the construction process of vibration forming and heating curing. When the permanent layer temperature meets the construction conditions, construction operations can be carried out. First install the impact plate and the seat brick, and tamped with ramming material, then pour the dry material into the bottom of the bag, pay attention to ensuring the thickness of the bottom of the bag, and require flatness; after the construction of the bottom of the bag, install the covered tire, and adjust the tire and The distance of the permanent layer: Pour the dry material into the tundish, fill it up to the upper edge of the tundish, turn on the vibrating motor to vibrate for 3 to 5 minutes, and then feed and vibrate until the vibrating material is filled to the edge of the bag. Do not bring packaging bags, plastic lined bags and other sundries into the tundish during construction.