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Method for desilicating molten iron by stirring

A technology for molten iron and desiliconization, which is applied in the field of molten iron stirring and desiliconization, and desiliconization of casting pig iron. Good, responsive effect

Active Publication Date: 2013-01-23
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for stirring and desiliconizing molten iron, which overcomes the defects of the above-mentioned method, such as large equipment occupation, high consumption of refractory materials, and environmental pollution.

Method used

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  • Method for desilicating molten iron by stirring
  • Method for desilicating molten iron by stirring
  • Method for desilicating molten iron by stirring

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In this example, 5 tanks of desiliconization were carried out. The desiliconization route of molten iron sinter is: molten iron tank—a small amount of slag removal—lowering stirring paddle for stirring—feeding of sinter and mixture—stirring and desiliconization—lifting the paddle to stop stirring—slagging off. The inner height of the hot metal treatment tank is 4120mm, the mouth diameter is 3100mm, and the average clearance height of the hot metal tank is 1.25m. Sintered ore powder T.Fe>55%, the mixture is a mixture of lime and fluorite, the mixing mass ratio is 9:1, lime powder CaO>85%; fluorite powder CaF 2 >85%, see Table 1, Table 2 and Table 3. The raw material ratio and addition amount of the desiliconizing agent are shown in Table 4.

[0029] Table 1 Composition of sinter

[0030] Fe 2 o 3 / %

FeO / %

T.Fe / %

CaO / %

SiO 2 / %

67.3

6.0

55.4

10

4

[0031] Table 2 Composition of lime powder

[0032] ...

Embodiment 2

[0042] In this example, 5 tanks of desiliconization were carried out. The process route for desiliconization of molten iron oxide scale is: molten iron tank—a small amount of slag removal—adding oxide scale and mixture—stirring desiliconization——slagging off. The average clearance height of the hot metal tank is 1.3m. The T.Fe=72.03% of the iron oxide scale, the mixture is the mixed powder of lime and fluorite, and the composition is shown in Table 2 and Table 3. The raw material ratio and addition amount of the desiliconizing agent are shown in Table 6 and Table 7.

[0043] Table 6 Iron oxide scale composition

[0044] T.Fe / %

T.O / %

CaO / %

S / %

SiO 2 / %

72.03

30.87

1.07

0.025

0.91

[0045] Table 7 The relationship between the amount of desiliconization agent

[0046] Hot metal ΔSi / %

Rolled steel sheet / kg / t 铁

Mixture / kg / t 铁

0.1

4.6

1.7

0.15

6.9

2.5

0.2

9.2

...

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Abstract

The invention relates to a method for desilicating molten iron by stirring, which belongs to the technical field of molten iron pretreatment. The method comprises four steps: allowing a stirring paddle to stir at a low speed; adding a desiliconization agent; allowing the stirring paddle to stir at a high speed for desilicication; and stopping the stirring paddle. The content of the desilicication agent is kept between 0.05 percent and 0.40 percent; the stirring paddle has a four-blade or three-blade steel structure coated with a fireproof material; the solid desiliconization agent is blown by a blowing device to the surface of the molten iron; the stirring may be realized by continuous or intermittent rotation or alternating clockwise and anticlockwise rotation; in any of the three stirring modes, the stirring paddle can rotate up and down a certain height; and when the method is used, the Si content in the molten iron may be reduced from about 0.50 percent to 0.20 percent, so the desilicication efficiency is over 50 percent. The method can also be used for desilicication during refining raw iron in casting field.

Description

technical field [0001] The invention belongs to the technical field of molten iron pretreatment, and in particular relates to a method for stirring and desiliconizing molten iron, which is suitable for performing desiliconization pretreatment of molten iron before converter and electric furnace steelmaking, and can also be used for desiliconization and refining of molten iron for foundry pig iron. technical background [0002] Desiliconization in iron and steel smelting and casting pig iron process is beneficial to effectively reduce the cost of steelmaking and improve product quality. Due to the limitations of desiliconization process, materials and equipment, the current industrial production of domestic metallurgical industry has not reached the level of adopting desiliconization technology as a whole. Molten iron that has not been desiliconized or not properly treated has problems such as large amount of slag and high iron loss in the subsequent process, which is not con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/04F27D27/00
Inventor 刘浏倪冰贺庆杨利彬姚同路杨勇孟华栋
Owner CENT IRON & STEEL RES INST
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