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A method for pre-desulfurization of molten iron by double blowing on the top and bottom of the molten iron ladle

A technology of hot metal pre-desulfurization and hot metal ladle, applied in the field of metallurgy

Inactive Publication Date: 2015-09-30
NORTHEASTERN UNIV LIAONING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems existing in the existing top-blowing molten iron pretreatment desulfurization, the present invention provides a desulfurization equipment and method for top-bottom double-blowing molten iron in the ladle

Method used

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  • A method for pre-desulfurization of molten iron by double blowing on the top and bottom of the molten iron ladle
  • A method for pre-desulfurization of molten iron by double blowing on the top and bottom of the molten iron ladle

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Embodiment 1

[0027] The invention has been implemented in the field and is used for desulfurization of molten iron, the temperature of the treated molten iron is 1390° C., and the initial sulfur content of the molten iron is 0.035%.

[0028] During implementation, the included angle between the gun body of the top blowing lance (4) and the central axis of the ladle (3) is 18°, the depth of insertion of the top blowing lance (4) into the molten iron is about 220mm from the bottom of the ladle, and the center of the muzzle is located at the ladle ( 3) On the central axis, the centerline of the spray gun body and the centerline of the bottom blowing ventilating element (5) are on the same vertical plane passing through the diameter of the bottom surface of the ladle (3), and the center of the bottom blowing ventilating element (5) is located at the ladle ( 3) At one-half of the radius of the bottom surface, the bottom blowing ventilation element (5) provided at the bottom of the ladle (3) uses...

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Abstract

The invention relates to a method for pre-desulfuration of a combined-blowing molten iron at the top and bottom in a ladle. The method is characterized in that equipment applied to the method mainly comprises a top-blowing powder spraying tank, a bottom-blowing powder spraying tank, the ladle, a top-blowing spraying gun and a bottom-blowing ventilation element. According to the equipment, various spraying and blowing parameters and the spraying-in quantity of desulfurizing agents such as magnesium powder are controlled, so that compared with the single top-blowing process under the same carrier gas flow, the method provided by the invention has the advantages that the even mixing time is shortened by 15-20%, and the magnesium powder is saved by 0.20-0.30kg in each ton of molten iron.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for pre-desulfurizing molten iron in a ladle. Background technique [0002] With the rapid development of modern industrial production and science and technology, the requirements for steel quality are increasing day by day. The production of low-sulfur steel and ultra-low-sulfur steel requires the pre-desulfurization process of molten iron, and the pre-desulfurization of molten iron has become one of the indispensable processes for optimizing the metallurgical production process. [0003] At present, the molten iron desulfurization process that has been industrialized can be mainly divided into two methods: mechanical stirring desulfurization (KR) and top spraying desulfurization. [0004] The KR stirring method is to use a stirrer to enter the molten iron ladle to rotate and stir the molten iron, and at the same time add a desulfurizer to make it get in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02
Inventor 罗志国董建李林蔚梁义会游洋顾克井刘志兴
Owner NORTHEASTERN UNIV LIAONING