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Molten iron dephosphorization device and dephosphorization method for smelting stainless steel

A stainless steel and molten iron technology, applied in the field of iron and steel metallurgy, can solve the problems of large space occupied by oxygen lances and spray guns, affecting the use effect of powder, and large loss of powder, saving space, shortening dephosphorization treatment time, and reducing smelting costs. Effect

Active Publication Date: 2019-11-01
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can dephosphorize molten iron very well, and the dephosphorization rate of molten iron is above 80%. The lance is blown to the surface of the molten iron, and the lime is added by inert gas injection, which can strengthen the agitation of the molten iron and promote the dephosphorization reaction; The sprayed powder has a large loss, which affects the use effect of the powder; second, the smelting time is long, generally about 40-50min

Method used

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  • Molten iron dephosphorization device and dephosphorization method for smelting stainless steel
  • Molten iron dephosphorization device and dephosphorization method for smelting stainless steel
  • Molten iron dephosphorization device and dephosphorization method for smelting stainless steel

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Embodiment 1

[0041] This embodiment discloses a hot metal dephosphorization device for smelting stainless steel, such as figure 1 As shown, the molten iron dephosphorization device includes a storage tank 1, a delivery tank 2, a blow tank 3, a spray gun 4, an air pipe 5 and a ladle 6, the storage tank 1 is connected with the blow tank 3 through the delivery tank 2, and the blow tank 3 and The ventilation pipes 5 are respectively connected with the spray guns 4; the spray guns 4 include a first pipe 41 and a second pipe 42, the first pipe 41 is provided with a support bearing or the first pipe 41 is composed of a flexible connecting pipe, and the first pipe 41 is telescopically arranged Inside the second pipe 42; the second pipe 42 is provided with N spray gun outlets, N≥1, the spray gun outlet is a streamlined rotating structure, and the spray gun outlet includes a connecting elbow 43 separated from the axis by the second pipe, along the circumference To the rotating connecting section 44 ...

Embodiment 2

[0050] This embodiment discloses a method for dephosphorizing molten iron for smelting stainless steel. This method uses the device for dephosphorizing molten iron in Example 1. The principle is that during the dephosphorization process of molten iron, the oxygen emitted from the spray gun reacts with the phosphorus in the molten iron Generate P 2 o 5 , react with the added lime powder to generate calcium phosphate, as shown in the reactions (1) and (2), the purpose of dephosphorization is achieved after entering the slag, when the slag is melted to form slag, the iron oxide in the slag and the iron Phosphorus reacts as shown in reaction (3).

[0051] 2P+5O 2 =2(P 2 o 5 ) (1)

[0052] (CaO)+(P 2 o 5 )=3CaO·P 2 o 5 (2)

[0053] 2P+5(FeO)+3(CaO)=3CaO·P 2 o 5 +5[Fe] (3)

[0054] The molten iron dephosphorization method for smelting stainless steel provided by the present embodiment comprises the following steps:

[0055] Step S1, desiliconizing the molten iron, scr...

Embodiment 3

[0062] This embodiment is aimed at the dephosphorization treatment of 50t molten iron, adopts the molten iron dephosphorization device such as embodiment 1, and the molten iron dephosphorization device comprises a storage tank 1, a delivery tank 2, a spray tank 3, a spray gun 4, an air pipe 5 and a ladle 6, and stores The tank 1 is connected with the spray tank 3 through the delivery tank 2, and the spray tank 3 and the ventilation pipe 5 are respectively connected with the spray gun 4; A tube 41 is telescopically arranged inside the second tube 42; the second tube 42 is provided with a spray gun outlet, and the spray gun outlet is a streamlined rotating structure, such as figure 2 As shown in a-2c, the outlet of the spray gun includes a connecting elbow 43 separated from the axis by the second pipe, a connecting section 44 rotating in the circumferential direction, and a nozzle 45. The diameter of the second pipe 42 is Φ260mm, and the diameter of the connecting elbow is The ...

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Abstract

The invention relates to a molten iron dephosphorization device and dephosphorization method for smelting stainless steel, belongs to the technical field of ferrous metallurgy, and solves the problemsthat an existing dephosphorization device is large in occupied space, large in powder loss and low in smelting efficiency. The molten iron dephosphorization device comprises a storage tank, a conveying tank, a blowing tank, a spray gun, a ventilation pipe and a steel ladle, wherein the storage tank is connected with the blowing tank through the conveying tank, and the blowing tank and the ventilation pipe are connected with the spray gun; the spray gun comprises a first pipe and a second pipe, the first pipe is provided with a supporting bearing or the first pipe consists of flexible connecting pipes, and the first pipe is telescopically arranged in the second pipe; and the second pipe is provided with N spray gun outlets. The dephosphorization method comprises the following steps that desiliconization treatment is carried out on molten iron, desiliconized slag is removed, the molten iron is sprayed with oxygen and slagging materials, and molten slag is formed on the surface of the molten iron; and the steel ladle is sprayed with oxygen and slagging materials for dephosphorization treatment, wherein the oxygen spraying flow is 0.9 Nm<3> / t.min-1.2 Nm<3> / t.min, and the oxygen supply pressure is not less than 0.6 Mpa, so that the self-rotation of the spray gun is guaranteed. The device and the method can be used for molten iron dephosphorization for smelting the stainless steel.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a molten iron dephosphorization device and a dephosphorization method for smelting stainless steel. Background technique [0002] In order to meet the requirements of phosphorus content in the production of stainless steel, the devices currently used in the dephosphorization process of molten iron powder spraying and oxygen spraying in ladles are three-hole oxygen lances and powder spraying lances. This method can dephosphorize molten iron very well, and the dephosphorization rate of molten iron is above 80%. The lance is blown to the surface of the molten iron, and the lime is added by inert gas injection, which can strengthen the agitation of the molten iron and promote the dephosphorization reaction; The sprayed powder has a large loss, which affects the use effect of the powder; second, the smelting time is long, generally about 40-50min. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/02C22C38/02C22C38/04
CPCC21C1/02C21C7/064C22C38/002C22C38/02C22C38/04
Inventor 吴伟高琦张波赵斌吴东俊
Owner CENT IRON & STEEL RES INST
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