KR stirring paddle and manufacture method thereof

Abstract

The invention discloses a KR stirring paddle and a manufacture method thereof. The KR stirring paddle is used in a hot-melt ladle desulfuration process and comprises a stirring shaft, paddles, a ventilating pipeline and ventilating holes, wherein the paddles are arranged on one end of the bottom of the stirring shaft, the core part of the stirring shaft is hollow and is used as the ventilating pipeline, the ventilating holes are formed in the paddles, one ends of the ventilating holes are communicated with the ventilating pipeline, the other ends of the ventilating holes are opened in the surfaces of the paddles, and one end of the top of the stirring shaft is connected with a gas supply device for supplying gas to the ventilating pipe. According to the invention, through the KR stirring paddle, the gas is introduced from the ventilating pipeline and is discharged from the ventilating holes, the discharged gas plays a role of reinforcing the stirring of molten ion to ensure that the molten iron is in well contact with a desulfurizing agent for reaction, therefore the desulfurization of the molten iron is accelerated, and the purpose of deep desulfurization of the molten iron is reached.

Description

technical field [0001] The invention relates to the field of molten iron desulfurization treatment, in particular to a KR stirring paddle and a manufacturing method thereof. Background technique [0002] So far, the desulfurization pretreatment of molten iron in the molten iron tank before converter steelmaking mainly adopts the KR stirring desulfurization method. During the KR stirring desulfurization process, the KR stirring paddle is inserted into a certain depth under the molten iron surface to rotate, and a vortex is generated. Under the entrainment effect of the vortex, the desulfurizer is sucked in the center of the vortex and discharged radially from the blades of the KR stirring paddle. Floating, during the floating process, the desulfurization reaction is completed through full contact with molten iron. [0003] In the stirring desulfurization process of the KR stirring paddle provided by the prior art, in order to make the desulfurizing agent fully contact with t...

AI Technical Summary

Problems solved by technology

[0003] In the stirring desulfurization process of the KR stirring paddle provided by the prior art, in order to make the desulfurizing agent fully contact with the molten iron, the rotational speed of the blade of the KR stirring paddle will be relatively large, but it will cause severe erosion and wear of the molten iron, resulting in the KR stirring paddle The paddle is seriously damaged, and there will be inconsequential phenomena such as structural spalling of the refractory lining of the stirring paddle, crack grooves, hole melting, local pits falling off, edge wear, and sticky slag erosion.

With the long-term use of the KR stirring paddle, the stirring ability of the KR stirring paddle to molten iron gradually weakens, which greatly reduces the desulfurization efficiency and shortens the service life of the KR stirring paddle

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