Method for increasing self-pouring rate of ladle and purity degree of molten steel

A technology of self-casting rate and purity, which is applied in the direction of casting molten material containers, metal processing equipment, casting equipment, etc., can solve problems such as difficult to improve ladle self-casting rate and sintering layer instability, and achieve reduction of non-metallic inclusions, Effects of improving purity and improving high-temperature performance

Active Publication Date: 2015-02-11
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this drainage method reduces the amount of drainage sand added, the sintered layer is still the drainage sand currently used in production. The high temperature performance ...

Method used

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  • Method for increasing self-pouring rate of ladle and purity degree of molten steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of method that present embodiment provides to improve ladle self-casting rate and molten steel purity, such as figure 1 Shown: including filling the upper nozzle with material 1 of the upper sealing layer, material 2 of the middle mixed layer and material 3 of the lower sealing layer; material 1 of the upper sealing layer is chrome drainage sand, and the material of the lower sealing layer is spherical particles Ferroalloy, mixed layer plugging material 2 is a mixture of spherical ferroalloy and drainage sand, and the particle size ratio of spherical ferroalloy to drainage sand ranges from 2 to 5; the thickness ratio of the three-layer plugging material filled in the upper nozzle is:

[0024] The filling method of the three plugging layer materials is as follows: when the ladle is empty, add the spherical ferroalloy particles of the lower plugging layer material into the upper nozzle of the ladle, and then fill the spherical ferroalloy particles of the mi...

Embodiment 2

[0033] The method for improving the self-casting rate of the ladle and the purity of the molten steel provided in this embodiment is aimed at producing other heats except the first heat of steel by continuous casting, and the height of the upper nozzle is 450 mm. The method is the same as that of Embodiment 1, and it includes The steps are:

[0034] 1) Make spherical particles of iron alloy with similar composition to molten steel to remove the oxide layer.

[0035] 2) Bake the spherical iron alloy and drainage sand to remove moisture.

[0036] 3) In the upper nozzle of the spherical ferroalloy particles, a lower sealing layer is formed with a thickness of 280mm.

[0037] 4) Mix spherical iron alloy with a particle size of 5mm and drainage sand with a particle size of 2mm to form a mixed layer. The number of spherical ferroalloys in the inner mixed layer gradually decreases from bottom to top, and the number of drainage sand gradually increases. The thickness of the mixed lay...

Embodiment 3

[0040]The method for improving the self-casting rate of the ladle and the purity of the molten steel provided in this embodiment is aimed at producing other heats except the first heat of steel by continuous casting, and the height of the upper nozzle is 450mm. The method is also the same as that of Embodiment 1, which includes The steps are:

[0041] 1) Make spherical particles of iron alloy with similar composition to molten steel to remove the oxide layer.

[0042] 2) Bake the spherical iron alloy and drainage sand to remove moisture.

[0043] 3) In the upper nozzle of spherical ferroalloy particles, a lower sealing layer is formed with a thickness of 250mm.

[0044] 4) Mix spherical iron alloy with a particle size of 5mm and drainage sand with a particle size of 2mm to form a mixed layer. The number of spherical ferroalloys in the inner mixed layer gradually decreases from bottom to top, and the number of drainage sand gradually increases. The thickness of the mixed layer...

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Abstract

The invention relates to a method for increasing the self-pouring rate of a ladle and the purity degree of molten steel. The method comprises the following steps: filling an upper nozzle with upper plugging layer material and lower plugging layer material, wherein the upper plugging layer material is chrome ladle filler sand, and the lower plugging layer material is spherical particle ferroalloy; filling the space between the upper plugging layer material and the lower plugging layer material with mixed layer material, wherein the mixed layer material is a mixture of spherical ferroalloy and ladle filler sand, and the fineness ratio of the spherical ferroalloy to the ladle filler sand ranges from 2 to 5. The method provided by the invention is simple and easy to operate, can improve the high-temperature property of a sintered layer, increases the self-pouring rate of the ladle, remarkably reduces the addition of conventional ladle filler sand, reduces non-metallic foreign materials which are brought in by ladle filler sand during pouring of the ladle, and increases the purity degree of molten steel.

Description

technical field [0001] The invention relates to a method for improving the self-casting rate of a ladle and the purity of molten steel, and belongs to the technical field of iron and steel metallurgy. Background technique [0002] In the actual steelmaking production, the auxiliary refractory drainage sand used in conjunction with the sliding nozzle system is used to fill the upper nozzle at the bottom of the ladle, which plays the role of sealing molten steel and drainage, and is an indispensable refractory material for the ladle. Before the molten steel is injected into the ladle, the drainage sand is used to block the injection hole, and then the molten steel is poured. For the use of drainage sand, the existing drainage sand generally has better high-temperature sintering performance, that is, it can quickly form a crust after contact with molten steel to form a shell that can block the downstream flow of molten steel. The drainage sand in the lower part plays more of a...

Claims

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Application Information

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IPC IPC(8): B22D41/44
CPCB22D41/44
Inventor 于湛吴利辉胡志勇
Owner NANJING IRON & STEEL CO LTD
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