Heating steel slag washing material for converter steel melting, preparation and use method

Abstract

The invention relates to slag washing materials for converter steel-making and a preparation method and a using method thereof. The common exothermic steel slag washing materials for the converter steel-making comprise a main calcium aluminate slag system and an exothermic compound, wherein the main calcium aluminate slag system is produced by calcination of limestone and bauxite materials at the temperature of between 1,200 and 1,800 DEG C. The slag washing materials comprise the following compositions as calculated by the total weight of the slag washing materials: 0 to 60 percent of CaO3, 20 to 45 percent of Al2O3, 1 to 15 percent of metallic aluminum, 1 to 8 percent of the exothermic compound, less than or equal to 10 percent of SiO2 and less than or equal to 0.5 percent of S. The invention also discloses a method for preparing the slag washing materials and a method for using the same. The slag washing materials can react quickly and have better deoxidation and desulfurization effect. Moreover, partial deoxidizing materials are saved and the production cost of steel enterprises is reduced.

Description

technical field

[0001] The invention relates to a slag washing material for converter steelmaking, a preparation method and a use method thereof. Background technique

[0002] With the development of social economy, users have higher and higher requirements on the quality of steel products. High-quality steel has strict requirements on the content of sulfur, oxygen and non-metallic inclusions. For example, high-grade pipeline steel requires s≤0.005% in steel, gears Steel requires total oxygen (T[O])≤0.0015% in steel, but the molten steel smelted by ordinary steelmaking furnace is difficult to meet such quality requirements.

[0003] The purpose of the slag washing process is to remove impurities and purify molten steel. During the tapping process of the converter, the slag washing material with a special ratio and strong adsorption and inclusion capacity is added, and the impact force of the steel flow and the dynamic stirring of hydrogen blowing are used to make the slag w...

Examples

Embodiment 1

[0027] The heating general steel slag washing material used for converter steelmaking, the slag washing material includes calcium aluminate main slag system and exothermic agent, and the calcium aluminate main slag system is calcined at a temperature of 1200-1800 ° C for limestone and bauxite The product, its physical and chemical index according to the percentage of slag washing material gross weight is as follows:

[0028] CaO 42.5% Al 2 o 3 35.4% Aluminum Metal 4.5%

[0029] Heat generating agent 3.6% SiO 2 ≤8% S≤0.5%; the total weight of the above-mentioned slag washing material is 100%, and the rest is unavoidable impurities.

[0030] The preparation method of the above-mentioned heating ordinary steel slag washing material for converter steelmaking comprises the following steps:

[0031] ① Preparation of calcium aluminate main slag system, crushing limestone and bauxite materials, the particle size of limestone and bauxite materials is 120 mesh to 150 mesh. Enter...

Embodiment 2

[0037] The heating general steel slag washing material used for converter steelmaking, the slag washing material includes calcium aluminate main slag system and exothermic agent, and the calcium aluminate main slag system is calcined at a temperature of 1200-1800 ° C for limestone and bauxite The product, its physical and chemical index according to the percentage of slag washing material gross weight is as follows:

[0038] CaO 36.4% Al 2 o 3 45.6% Aluminum Metal 6.4%

[0039] Heat generating agent 3.6% SiO 2 ≤8% S≤0.5%; the total weight of the above-mentioned slag washing material is 100%, and the rest is unavoidable impurities.

[0040] The preparation method and usage method of the above examples are as described in Example 1.

Embodiment 3

[0042] The heating general steel slag washing material used for converter steelmaking, the slag washing material includes calcium aluminate main slag system and exothermic agent, and the calcium aluminate main slag system is calcined at a temperature of 1200-1800 ° C for limestone and bauxite The product, its physical and chemical index according to the percentage of slag washing material gross weight is as follows:

[0043] CaO 51.2% Al 2 o 3 30.6% Aluminum Metal 2.4%

[0044] Heat generating agent 6.8% SiO 2 ≤8% S≤0.5%; the total weight of the above-mentioned slag washing material is 100%, and the rest is unavoidable impurities.

[0045] The preparation method and usage method of the above examples are as described in Example 1.

technical field

[0001] The invention relates to a slag washing material for converter steelmaking, a preparation method and a use method thereof. Background technique

[0002] With the development of social economy, users have higher and higher requirements on the quality of steel products. High-quality steel has strict requirements on the content of sulfur, oxygen and non-metallic inclusions. For example, high-grade pipeline steel requires s≤0.005% in steel, gears Steel requires total oxygen (T[O])≤0.0015% in steel, but the molten steel smelted by ordinary steelmaking furnace is difficult to meet such quality requirements.

[0003] The purpose of the slag washing process is to remove impurities and purify molten steel. During the tapping process of the converter, the slag washing material with a special ratio and strong adsorption and inclusion capacity is added, and the impact force of the steel flow and the dynamic stirring of hydrogen blowing are used to make the slag w...

Examples

Embodiment 1

[0027] The heating general steel slag washing material used for converter steelmaking, the slag washing material includes calcium aluminate main slag system and exothermic agent, and the calcium aluminate main slag system is calcined at a temperature of 1200-1800 ° C for limestone and bauxite The product, its physical and chemical index according to the percentage of slag washing material gross weight is as follows:

[0028] CaO 42.5% Al 2 o 3 35.4% Aluminum Metal 4.5%

[0029] Heat generating agent 3.6% SiO 2 ≤8% S≤0.5%; the total weight of the above-mentioned slag washing material is 100%, and the rest is unavoidable impurities.

[0030] The preparation method of the above-mentioned heating ordinary steel slag washing material for converter steelmaking comprises the following steps:

[0031] ① Preparation of calcium aluminate main slag system, crushing limestone and bauxite materials, the particle size of limestone and bauxite materials is 120 mesh to 150 mesh. Enter...

Embodiment 2

[0037] The heating general steel slag washing material used for converter steelmaking, the slag washing material includes calcium aluminate main slag system and exothermic agent, and the calcium aluminate main slag system is calcined at a temperature of 1200-1800 ° C for limestone and bauxite The product, its physical and chemical index according to the percentage of slag washing material gross weight is as follows:

[0038] CaO 36.4% Al 2 o 3 45.6% Aluminum Metal 6.4%

[0039] Heat generating agent 3.6% SiO 2 ≤8% S≤0.5%; the total weight of the above-mentioned slag washing material is 100%, and the rest is unavoidable impurities.

[0040] The preparation method and usage method of the above examples are as described in Example 1.

Embodiment 3

[0042] The heating general steel slag washing material used for converter steelmaking, the slag washing material includes calcium aluminate main slag system and exothermic agent, and the calcium aluminate main slag system is calcined at a temperature of 1200-1800 ° C for limestone and bauxite The product, its physical and chemical index according to the percentage of slag washing material gross weight is as follows:

[0043] CaO 51.2% Al 2 o 3 30.6% Aluminum Metal 2.4%

[0044] Heat generating agent 6.8% SiO 2 ≤8% S≤0.5%; the total weight of the above-mentioned slag washing material is 100%, and the rest is unavoidable impurities.

[0045] The preparation method and usage method of the above examples are as described in Example 1.

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