In order to smelt high-quality steel efficiently and economically, oxygen converters and electric furnaces have become containers for preliminary decarburization, heating and melting of scrap steel or smelting some ordinary steel, while the refining of molten steel is transferred to the ladle. The current development of the steel industry is relatively low. , Under the premise of adapting to the current situation, it is necessary to develop energy-saving, environmentally friendly, high-quality and efficient refractory materials for ladle lining.
 
Requirements for ladle lining materials
1.1 Thermal shock resistance
The ladle is operated intermittently. In each section of the ladle, its internal temperature varies widely. During the violent change of the internal temperature of the ladle, the lining refractory material is required to be free from cracks and has good thermal shock resistance. .
1.2 Slag corrosion resistance
In the process of ladle continuous casting, the slag layer on the molten steel surface gradually decreases as the molten steel flows out from the bottom of the ladle, and the ladle lining refractory material has a long contact time with the slag, which requires good slag erosion resistance.
1.3Anti-scour
In the process of molten steel refining, molten steel forms a huge plume inside the ladle, which seriously scours the refractory lining of the ladle, requiring good erosion resistance.
 
Development direction of ladle lining materials
2.1 Aluminum-magnesium castables
Based on the current research on aluminum-magnesium castables, by optimizing particle gradation, adding appropriate particle size and appropriate amount of fused magnesia, it can generate magnesia-alumina spinel in situ at high temperature, and under the action of micro-expansion , to enhance the thermal shock resistance and corrosion resistance of the ladle lining. At the same time, by adjusting the formula and construction technology, etc., to prevent the bursting phenomenon after the overall pouring.
 
2.2 MgO—CaO castables
In order to better remove inclusions in molten steel, calcium-containing refractories have gradually attracted widespread attention at home and abroad. On the basis of MgO-CaO bricks, MgO-CaO castables are prepared by pretreatment of MgO-CaO sand, such as high temperature firing, surface treatment, introduction of additives, etc., and the surface is brushed wit