Slag melting agent and preparation method thereof and semi-steel steelmaking method adopting slag melting agent

A technology of slag-removing agent and molten steel, which is applied in the field of semi-steel steelmaking and semi-steel steelmaking in converters. It can solve the problems of reducing the amount of alloyed manganese, sticking guns, and difficulties in dephosphorization, and achieve the effect of reducing the amount of use.

CN105063268AInactive Publication Date: 2015-11-18CHENGDE JIANLONG SPECIAL STEEL
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2015-11-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a slag melting agent and a preparation method thereof and a semi-steel steelmaking method adopting the slag melting agent. The slag melting agent mainly contains, by weight, 30%-35% of SiO2, 9%-13% of MnO, 5%-10% of CaO, 6%-8% of Al2O3, 12%-18% of TFe and the balance P2O5, MgO and H2O. The slag melting agent is prepared mainly by manganese ore powder, vanadium tailings, oxide scales, lime powder, bentonite and binding agents. By means of the slag melting agent, semi-steel smelting primary slag formation time can be helped to be kept within 4min; the problems of lance-sticking and difficult dephosphorization caused by difficult slag melting can be solved; content of remaining manganese in semi-steel smelting end-point liquid steel can be increased; content of remaining manganese in converter end-point liquid steel is increased by 0.02%-0.05%; the alloying function is achieved; the application amount of alloyed manganese is reduced.
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Description

technical field

[0001] The invention belongs to the technical field of converter semi-steel making, and in particular relates to a slagging agent, a preparation method thereof and a semi-steel making method using the same. Background technique

[0002] In order to recover the vanadium resources in the vanadium-titanium iron concentrate, the blast furnace is equipped with vanadium-titanium iron concentrate, and the vanadium-titanium molten iron produced is generally firstly extracted from vanadium during the steelmaking process, and then steelmaking. After vanadium extraction, the molten iron (hereinafter referred to as semi-steel) basically contains traces of silicon and manganese, the carbon content is 3.3-3.7wt%, and the temperature is about 1380-1420°C. In the process of smelting semi-steel, due to the single composition of slag elements and insufficient chemical heat, it is difficult to melt the slag during the blowing process of the steelmaking converter, which seriousl...

Examples

Embodiment 1

[0050] The slag-removing agent is mainly prepared from the following raw materials according to the percentage by weight of each raw material:

[0051]

[0052] Among them, the main components and contents of manganese ore powder, vanadium extraction tailings, iron oxide scale, lime powder, bentonite and binder are shown in Table 3:

[0053] table 3

[0054] Element

TF

SiO 2

CaO

Al 2 o 3

MnO

Impurities

[0055]

(％)

(％)

(％)

(％)

(％)

(％)

Manganese ore powder

12.79

39.96

7.60

7.65

9.71

margin

Vanadium extraction tailings

38.43

15.65

3.67

1.66

6.35

margin

Iron oxide scale

70.00

/

/

/

/

margin

lime powder

/

4.00

78.00

/

/

margin

Bentonite

2.20

59.20

3.44

/

/

margin

binder

/

/

/

/

/

/

[0056] The preparatio...

Embodiment 2

[0071] The slag-removing agent is mainly prepared from the following raw materials according to the percentage by weight of each raw material:

[0072]

[0073] Among them, the contents of the main components of manganese ore powder, vanadium extraction tailings, iron oxide scale, lime powder, bentonite and binder are shown in Table 3.

[0074] The preparation method of the slagging agent is as follows: crush manganese ore powder and lime powder until the particle size is less than 3mm. Mix 460kg of manganese ore powder, 200kg of vanadium extraction tailings, 100kg of bentonite, 130kg of iron oxide scale, 80kg of lime powder and 30kg of binder, mix them evenly, press them into balls, transport them to the baking equipment by belt, and dry them for 2 hours. The weight percentage of water is less than 3%, and the slag balls are obtained.

[0075] After the slag ball falls freely from a height of 2 meters to the cement floor, the weight of the powder surface (particle size < ...

Embodiment 3

[0087] The slag-removing agent is mainly prepared from the following raw materials according to the percentage by weight of each raw material:

[0088]

[0089] Among them, the contents of the main components of manganese ore powder, vanadium extraction tailings, iron oxide scale, lime powder, bentonite and binder are shown in Table 3.

[0090] The preparation method of the slagging agent is as follows: crush manganese ore powder and lime powder until the particle size is less than 3mm. Mix 450kg of manganese ore powder, 300kg of vanadium extraction tailings, 100kg of bentonite, 70kg of iron oxide scale, 55kg of lime powder and 25kg of binder, mix them evenly, press them into balls, transport them to the baking equipment by belt, and dry them for 2.5 hours. The weight percentage of water is less than 3%, and the slag balls are obtained.

[0091] After the slag ball falls freely from a height of 2 meters to the cement floor, the weight of the powder surface (particle size <...