Impellor and melt-pool processing method using same

Abstract

The present invention concerns an impellor for stirring a melt pool and concerns a melt-pool processing method using same. The impellor comprises: an impellor body extending in the length direction; an intake nozzle which is provided in such a way as to pass through one part at the bottom end of the impellor body; and a blade provided on the upper part of the impellor body. As a result, when embodiments of the present invention are used, a stirring flow produced due to the blade and a stirring flow due to substances taken in to the melt pool via the intake nozzle are united with each other, and the two flows are combined such that the overall stirring force is improved. Consequently, it is possible to improve the efficiency of stirring by the impellor as compared with hitherto, and, as a result, refining efficiency in a refining step is improved as the rate of reaction between the melt pool and additives is increased.

Description

technical field

[0001] The present invention relates to impellers and methods of treating molten pools using the same, and more particularly, to impellers capable of improving refining efficiency, and methods of treating molten pools using the same. Background technique

[0002] Phosphorus (P) in ferromanganese used as a ferroalloy in steelmaking is a factor that deteriorates the quality of the finished steel, for example, causing high temperature brittleness. Therefore, dephosphorization to remove phosphorus (P) from molten ferromanganese (ie, the ferromanganese bath) is usually performed.

[0003] In a typical dephosphorization process for the production of ferromanganese, the molten pool is poured into a ladle and the impeller is submerged in the molten pool to agitate the molten pool. Here, the general impeller 20 has wings, ie, blades on the lower side of the stirring shaft, as disclosed in Korean Patent Laid-Open No. 2011-0065965. refer to figure 2 A typical impelle...

Examples

Embodiment 1

[0114] In Example 1, 95 g of BaCO 3 , 5g NaF 2 1.5 g of carbon (C) was mixed, and the mixture was heated at 1350° C. for 2.5 hours in an inert gas (Ar) atmosphere. Here, 1.5 g of carbon mixed corresponds to 1.1 times the number of moles of BaO when BaO is produced in a composition based on a liquidus line, which is a boundary line of a region where two phases of a solid phase and a liquid phase coexist.

Embodiment 2

[0116] In Example 2, 95g BaCO 3 , 5g NaF 2 1.5 g of carbon (C) was mixed, and the mixture was heated in air at 1150° C. for 5 hours. Here, the content of carbon corresponds to 1.6 times the liquidus of BaO.

Embodiment 3

[0118] In Example 3, 100 g of BaCO 3 Heated in air at 1450°C for 5 hours.

technical field

[0001] The present invention relates to impellers and methods of treating molten pools using the same, and more particularly, to impellers capable of improving refining efficiency, and methods of treating molten pools using the same. Background technique

[0002] Phosphorus (P) in ferromanganese used as a ferroalloy in steelmaking is a factor that deteriorates the quality of the finished steel, for example, causing high temperature brittleness. Therefore, dephosphorization to remove phosphorus (P) from molten ferromanganese (ie, the ferromanganese bath) is usually performed.

[0003] In a typical dephosphorization process for the production of ferromanganese, the molten pool is poured into a ladle and the impeller is submerged in the molten pool to agitate the molten pool. Here, the general impeller 20 has wings, ie, blades on the lower side of the stirring shaft, as disclosed in Korean Patent Laid-Open No. 2011-0065965. refer to figure 2 A typical impelle...

Examples

Embodiment 1

[0114] In Example 1, 95 g of BaCO 3 , 5g NaF 2 1.5 g of carbon (C) was mixed, and the mixture was heated at 1350° C. for 2.5 hours in an inert gas (Ar) atmosphere. Here, 1.5 g of carbon mixed corresponds to 1.1 times the number of moles of BaO when BaO is produced in a composition based on a liquidus line, which is a boundary line of a region where two phases of a solid phase and a liquid phase coexist.

Embodiment 2

[0116] In Example 2, 95g BaCO 3 , 5g NaF 2 1.5 g of carbon (C) was mixed, and the mixture was heated in air at 1150° C. for 5 hours. Here, the content of carbon corresponds to 1.6 times the liquidus of BaO.

Embodiment 3

[0118] In Example 3, 100 g of BaCO 3 Heated in air at 1450°C for 5 hours.

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