Due to the different working conditions of various parts of the converter lining material, the parts of the converter lining are unevenly eroded. Although the slag splashing technology can be lining by splashing slag, it is difficult to form a uniform slag layer on the surface of the lining, and it is also very It is difficult to repair the severely damaged parts. Therefore, the repair of the converter lining is a powerful measure to extend the life of the lining, equalize the damage of the lining, and reduce the production cost.
1.Hot-flow Self-flowing Repairing Material for Converter
The hot self-flowing repairing refractory material is mainly used for the repair of the steel surface and the tapping side of the converter, and is also called a large surface repairing material, referred to as a large fabric. When used, the repairing refractory material is put into the furnace from the furnace mouth, and the furnace body is shaken. Under the action of the residual heat in the furnace, the repairing refractory material flows and spreads on the damaged part of the furnace lining, and the hot self-flowing repairing material.
Hot-flow Self-flowing Repairing Material Advantage
(1) The self-flowing refractory material has good spreading and fluidity at the residual heat temperature of the converter lining (800~1200 °C).
(2) The self-flowing refractory material solidifies quickly after spreading.
(3) The self-flowing refractory material of the solid has good adhesion to the original lining material.
(4) The self-flowing refractory material itself should have good corrosion resistance and prevent the repairing layer from being eroded during the next smelting.
2. Converter for Spray to Mend Material
The converter lining may be partially damaged during the service and it is not suitable to be repaired with the charge material, such as the trunnion and the slag line. The refractory material is sprayed on the part with severe local damage, so that it is sintered with the furnace lining brick to repair the lining. The main raw material for the converter lining spray is composed of magnesia, binder, plasticizer and a small amount of water. Commonly used spray methods include dry spray, semi-dry spray, and flame spray. The specific requirements for the lining spray feed of the converter furnace are sufficient refractoriness; it can withstand the high temperature in the furnace; the spray material can be attached to the lining to be sprayed; the material detachment is less; the spray material adhesion layer can be treated The surface of the red hot lining of the spray (800~1000 °C) is well sintered, melted into one body and has sufficient strength; the spray filler layer can withstand the erosion of high temperature slag, molten steel, furnace gas and metal oxide vapor; The spray material can flow smoothly in the spray pipe.
