Precautions for Ladle Nozzle Filling Sand:
The following points should be paid attention to during the use of the product in the links that affect the pouring process or each operation section:
1.Ladle preparation
The residual steel around the wall of the bag and the bricks of the nozzle block when the empty bag is turned back from the casting machine. If the residual steel around the cladding wall is not cleaned up. When the converter is tapped out, the base tank will be shaken off, and it will not be able to add sand when it falls into the nozzle. The residual steel at the nozzle of the runner block slide plate must be completely burned clean, and the parts that cannot be burned or whose service life has expired need to be replaced in time.
When burning residual steel, it should be done bidirectionally from the top of the ladle mouth and the direction of the drain to ensure that the nozzle is transparent. The air outlet of the ventilating brick must be burned out. If the air outlet is not exposed, it will affect the argon blowing effect in the future. If the argon blowing is not good, it will cause the bottom of the tank to crust in the future. There is a pot at the bottom of the tank, The skateboarder closes the skateboard after all the burn-in work and should try the skateboard several times, so as to omit the test of the flexibility of the skateboard and the hydraulic mechanism by the caster ladle worker in the future, so as to gain time on the casting machine. Finally, turn over the ladle to pour out all residual steel in the ladle.
2. Sand feeding work
Sanding workers should carefully observe the nozzle conditions before adding sand. Anyone with foreign objects will require the aerial crane to flip the ladle and dump it, because the residual steel in the nozzle is the deadliest. Once there is residual steel in the nozzle, it is difficult for the ladle of the casting machine to burn oxygen. If the situation is serious, the casting machine will stop pouring due to the failure to open pouring for a long time, and the accident will be seriously responsible.
The sanding of the casting machine is the last process to check the nozzle, which is of great significance. The amount of addition depends on the size of the seat bricks, and the shape of the sand pile should be 5-10cm higher than the ladle bottom brick.
3. Converter tapping
a.?The alloy should be placed away from the nozzle, especially the aluminum alloy. Aluminum is extremely replaceable. Aluminum and the oxides in the drainage sand are the easiest to react. The formation of aluminum oxide with extremely poor fluidity affects the pouring. Many domestic steel mills have a headache in making high-aluminum steel.
b.?When the converter is tapping, the tapping direction should avoid the position of the nozzle drainage agent to prevent the molten steel from being washed into the sand.
Factors affecting automatic pouring include:
①Steel grade, molten steel viscosity, tapping temperature, timing, etc.
②Material of nozzle block brick. High-aluminum materials are better than magnesium-carbon materials. Carbon materials have strong thermal conductivity, and the sand is heated more, which affects the fluidity of the sand.
③Permeable brick performance. Poor argon blowing will form a crust on the bottom of the tank.
④Skateboard and mechanism performance.
Article Source：Tundish lining construction and refractory material composition
Company name: Henan Changxing Refractory Materials Co.,Ltd
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