A method to improve the service life of kr stirring head

A technology of stirring head and service life, which is applied in the field of improving the service life of KR stirring head, can solve the problems of short service life of KR stirring head, achieve the effect of shortening the stirring time, increasing the service life and increasing the speed of slag formation

Active Publication Date: 2018-06-22
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The embodiment of the present invention provides a method for improving the service life of the KR stirring head, which solves the technical problem of the short service life of the KR stirring head in the KR desulfurization process in the prior art, and prevents the KR stirring head from Internal cracks reduce the shear stress on the KR stirring head and increase the service life of the KR stirring head

Method used

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  • A method to improve the service life of kr stirring head

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Embodiment 1

[0029] The present embodiment is a 300t KR desulfurization station, the diameter of the molten iron ladle used is 4150mm, and the depth of the molten iron after 300t molten iron is loaded is 4500mm. The blade length of the KR stirring head is designed to be 1453mm, and the ratio of the blade length of the KR stirring head to the diameter of the ladle is controlled to be 0.35. The area of ​​the blade facing the iron of the KR stirring head is 1.87 square meters. The ratio to the area of ​​the longitudinal section of the ladle is 0.10. Before the stirring head enters the molten iron and starts to stir, control the KR stirring head to bake for 5 minutes above the ladle. When the KR stirring head is baking above the ladle, the distance between the KR stirring head and the liquid surface of the ladle is 0.2m. During the desulfurization process, the maximum rotation speed of the KR stirring head is controlled to be 100rpm, the ratio of the immersion depth of the KR stirring head to...

Embodiment 2

[0031] The present embodiment is a 300t KR desulfurization station, the diameter of the molten iron ladle used is 4150mm, and the depth of the molten iron after 300t molten iron is loaded is 4500mm. The blade length of the KR stirring head is designed to be 1657mm. The ratio of the blade length of the KR stirring head to the diameter of the ladle is controlled to be 0.4. The area of ​​the KR stirring head blade facing the iron is 2.01 square meters. The ratio to the area of ​​the longitudinal section of the ladle is 0.10. Before the stirring head enters the molten iron and starts to stir, control the KR stirring head to bake for 15 minutes above the ladle. When the KR stirring head is baked above the ladle, the distance between the KR stirring head and the liquid surface of the ladle is 1.2m. During the desulfurization process, the maximum rotation speed of the KR stirring head is controlled to be 80rpm, the ratio of the immersion depth of the KR stirring head to the depth of...

Embodiment 3

[0033]The present embodiment is a 300t KR desulfurization station, the diameter of the molten iron ladle used is 4150mm, and the depth of the molten iron after 300t molten iron is loaded is 4500mm. The blade length of the KR stirring head is designed to be 1867mm, and the ratio of the blade length of the KR stirring head to the diameter of the ladle is controlled to be 0.45. The area of ​​the blade facing the iron of the KR stirring head is 2.24 square meters. The ratio to the area of ​​the longitudinal section of the ladle is 0.10. Before the stirring head enters the molten iron and starts stirring, control the KR stirring head to bake for 20 minutes above the ladle. When the KR stirring head is baked above the ladle, the distance between the KR stirring head and the liquid surface of the ladle is 2m. During the desulfurization process, the maximum rotation speed of the KR stirring head is controlled to be 70rpm, the ratio of the immersion depth of the KR stirring head to th...

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Abstract

The invention relates to the technical field of metallurgy, in particular to a method for prolonging the service life of a KR stirring head. The method comprises the steps that 1, the ratio of the length of blades of the KR stirring head to the diameter of a hot metal ladle is controlled to be 0.35-0.45, and the ratio of the area of the surface facing iron of the blades of the KR stirring head to the area of the longitudinal section of the hot metal ladle is controlled to be 0.10-0.12; 2, before entering hot metal to be stirred, the KR stirring head is controlled to be baked for 5-20 min above the hot metal ladle; and 3, in the desulfurization process, the maximum rotating speed of the KR stirring head is controlled to be 70-100 rpm, and the ratio of the immersion depth of the KR stirring head to the depth of the hot metal is controlled to be 0.35-0.50. According to the method for prolonging the service life of the KR stirring head provided by the embodiment of the invention, the interior of the KR stirring head is prevented from producing cracks on the premise that efficient desulfurization is ensured, the shearing stress on the KR stirring head is reduced, and the service life of the KR stirring head is prolonged.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for improving the service life of a KR stirring head. Background technique [0002] In metallurgical production, as the condition of upstream molten iron deteriorates, and downstream customers have increasingly stringent requirements for molten steel composition, steelmaking needs to achieve narrow composition control, because KR has huge kinetic and thermodynamic advantages in desulfurization , can achieve very low sulfur content control at the end of hot metal pretreatment. In general, the good desulfurization effect of KR is achieved at the expense of the life of the stirring head. In order to achieve high-efficiency desulfurization, it is generally achieved by fast stirring speed and prolonging the processing time. The thermal stress caused by the change of cold and heat will cause Cracks occur inside the refractory material, and at the same time, increasing the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02C21C7/064
CPCC21C1/02C21C7/064C21C7/0645
Inventor 高攀王飞崔园园李海波曹勇孙亮杨健姜仁波庞在刚
Owner SHOUGANG CORPORATION
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