Brief Introduction of EAF tapping groove
When the electric furnace is tapping, the furnace body is inclined at a certain angle (usually 45s) to the tapping direction, and the molten steel flows through the tapping groove and enters the ladle. In addition to the diversion of molten steel, the tapping groove also plays the role of preventing molten steel from spreading, protecting molten steel and reducing secondary oxidation. If the design of the geometric shape or the improper use of refractory materials will lead to large heat loss, high consumption of refractory materials, and even increase of non-metallic inclusions in molten steel.
The structure of slot tapping is that the tapping hole is located above the copper water surface. In the past, the tapping method of the tapping slot was to tap the molten steel in the state where the steel slag covered the molten steel. The main purpose was to prevent the temperature drop of the molten steel, improve the desulfurization capacity and prevent the molten steel from oxidation . Now the tapping starts from close to the bottom of the furnace, and communicates with the large upward-sloping tapping channel at the outer flat wall.
The tapping groove is connected to the furnace shell, and its masonry methods include ramming, pouring, bricklaying or comprehensive masonry. The masonry method of the tapping hole is relatively consistent. Generally, tapping bricks of various shapes are used to build or a steel pipe in the center, surrounded by high-quality magnesia castables as a whole. There are also ceramic tubes with a wall thickness of 25mm and 23 high-grade high-grade castables. Made of fused magnesia bricks. Usually, after using the 5070 furnace, it is necessary to replace the new tapping hole. When the tapping groove is used for tilting tapping, the main damaged parts are the molten steel line, the slag line, and the bell mouth at the front of the groove. The refractory material is required to have good wear resistance, slag corrosion resistance, and thermal shock resistance. Prevents cracking and minimizes wear.
Foreign electric furnace tapping grooves are generally made of high-alumina, magnesia-aluminum, zirconium, magnesia-carbon, wax stone, etc. or add SiC, Si3N4 and C and oxidants and have a service life of more than 100 times after maintenance and repair. of more than 300 times.