After the ladle lining working layer is used, if all the remaining materials of the ladle wall are removed, it will cause a waste of refractory materials and increase the cost of the ladle. Therefore, by surface treatment of the residual ladle wall refractory castables, the original materials on the ladle wall are effectively used to cast new working layers in the later stage. The amount of original refractory material retained during disassembly can be saved, which directly reduces the use of ladle refractory materials. consumption, and ultimately achieve the purpose of reducing costs.
1. Casting technology for the working layer at the bottom of the ladle
Ladle casting has high requirements on the mixing quality of the castables used. During the mixing operation, start the mixer first and then unload the castables. Load the castables strictly according to the rated power of the knotting machine. Dry stir for 1 to 2 minutes after unloading, so that the ladle castables Mix evenly, then add water according to the actual situation of the castable, make sure the amount of water added is within the range of ±7%, stir for 2 to 3 minutes to fully combine the water and the castable, and achieve the best quality. The amount of water added affects the performance of the castable. If the amount of water added is too little, the normal temperature pressure resistance of the castable is <20MPa; if the amount of water added is too much, the castable will segregate and reduce the anti-scouring performance of the castable.
Stir the refractory castables evenly according to the dosage, and then unload the material evenly to the bottom of the ladle. Turn on the vibrating rod to vibrate at the cutting edge. During the vibration process, two people are required to drag the vibrating rod in reverse direction at the same time. Stop the vibration when no bubbles appear on the surface. This can ensure The bonding strength of the castables, the mixed castables must be poured and vibrated within 30 minutes. The thickness of the knotted bottom of the ladle is determined according to the ladle production process standards. It is generally flush with the breathable bricks used. During the knotting process of the ladle bottom, it must be ensured that the bottom of the ladle is flat, vibrates evenly, has no honeycombs, and has no debris on the top. It must be stationary for 30~ Wait for 40 minutes until the surface is initially set. After the initial set strength is sufficient, install the overcast mold.
2. Ladle wall working layer castable material nesting technology
Lift the working layer tire into the ladle and place it flat and straight. Since the steel ladle and tire are used together, the tire placement deviation is controlled within the range of 10mm. After the tire is seated, use the tightening rod to fix it in time to make the tire No deflection occurs during pouring vibrations. When only laying bricks on the ladle wall, the gap between the mold and the original ladle wall should be sealed with asbestos felt to avoid material leakage during vibration.
The refractory castables for covering the walls of the ladle must have good fluidity. After the castables are stirred normally, drive the mixer to the position of the ladle and evenly feed the remaining material between the ladle and the mold. At the same time, turn on the vibrator and vibrate while discharging the material. In this way, no voids will appear inside the vibrated castable, ensuring that the castable castable is fully combined with the original castable. Stop unloading when the wall castables are knotted to the specified height. It is required that the vibration of the castables does not allow holes, honeycombs, and pitted surfaces at all. The surface of the castables must be vibrated flat, and there must be no water accumulation or inconsistent heights.
