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Alkaline oxygen converter steelmaking slagging fluxing agent and its preparing method and slagging method

An oxygen converter and flux technology, which is applied in the direction of manufacturing converters, etc., can solve the problems of the converter lining refractory being subjected to more, unfavorable CaO smelting effect, and unfavorable converter smelting efficiency, so as to reduce the consumption of lime, shorten the smelting cycle, improve the The effect of steelmaking efficiency

Inactive Publication Date: 2007-09-12
JIANGSU UNIV
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Problems solved by technology

Bauxite is used as a flux, the main component of which is Al 2 o 3 and Fe 2 o 3 It can play the role of slag melting and fluxing, but a large amount of Fe in bauxite 2 o 3 It will also absorb the heat in the initial stage of blowing, and cause more corrosion to the converter lining refractories, and the Al in the bauxite 2 o 3 Form 3CaO·Al with newly melted CaO 2 o 3 and 12CaO·7Al 2 o 3 , although it has the effect of promoting lime melting, but due to the large amount of Al in bauxite 2 o 3 , SiO 2 Forming a relatively stable compound with CaO is not conducive to increasing the activity of CaO in the initial slag, obviously not conducive to the smelting effect of CaO, resulting in a decrease in its utilization rate and an increase in its usage
In addition, from the perspective of slagging, the slagging time of bauxite is generally 7 minutes, while that of fluorite is about 6 minutes, so bauxite slag is slow, which is not conducive to improving the efficiency of converter smelting
[0006] To sum up, several fluxes currently used in steelmaking and slagging have certain deficiencies, which have a negative impact on production, and it is necessary to develop new fluxes
[0007] Boron mud is the waste residue discharged after the production of borax by using boron magnesium (iron) ore. Only Liaoning Province produces 20 million tons of boron mud every year, which needs to be comprehensively utilized

Method used

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  • Alkaline oxygen converter steelmaking slagging fluxing agent and its preparing method and slagging method
  • Alkaline oxygen converter steelmaking slagging fluxing agent and its preparing method and slagging method
  • Alkaline oxygen converter steelmaking slagging fluxing agent and its preparing method and slagging method

Examples

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Effect test

Embodiment 1

[0021] Implementation example 1 - low-silicon hot metal smelting high-carbon steel The amount of slag-forming flux added is 10kg / t steel, replacing all the fluorite and bauxite in the original slag-making materials:

[0022] The slagging flux is prepared from boron mud and industrial reagents from a borax factory in Dandong, Liaoning. The preparation process is as follows: boron mud is sintered in a sintering kiln at 200-400 ° C for 1 hour, fully dehydrated, and its composition is determined by chemical analysis method: B 2 o 3 4.1%, CaO 44.9%, MgO 25.5%, Al 2 o 3 15.3%, Fe 2 o 3 10.2%, take anhydrous boric anhydride with a boron mud content of 1.9%, grind it and mix it with boron mud, grind it into a fine powder below 0.1mm, granulate it to make a spherical material of 5-30mm, and dry it at 200°C. use.

[0023] On 100 tons of converters, the slagging flux (composed of: B) prepared above is adopted 2 o 3 6%, MgO 25%, CaO 44%, Al 2 o 3 15%, Fe 2 o 3 10%) slag,...

Embodiment 2

[0027] Implementation example 2 - high-silicon hot metal smelting high-carbon steel The amount of slag-forming flux added is 6kg / t steel, replacing all the fluorite and bauxite in the original slag-making materials:

[0028] The slagging flux is prepared from borax mud and industrial reagents from a borax factory in Dandong. The preparation process is as follows: boron mud is sintered in a sintering kiln at 200-400°C for about 1 hour, fully dehydrated, and its composition is determined by chemical analysis method: B 2 o 3 4.1%, CaO 44.9%, MgO 25.5%, Al 2 o 3 15.3%, Fe 2 o 3 10.2%, take anhydrous boric anhydride with boron mud content of 0.9%, grind it and mix it with boron mud, grind it into a fine powder below 0.1mm, granulate it into a spherical material of 5-30mm, and dry it at 200°C. use.

[0029] On the 100-ton converter, the above-mentioned slagging flux (composed of: B 2 o 3 5%, CaO 45%, MgO 25%, Al 2 o 3 15%, Fe 2 o 3 10%) slag, when the initial Si con...

Embodiment 3

[0034] Implementation Example 3 - Addition amount of low-carbon steel slag-forming flux in high-silicon hot metal smelting 2kg / t steel for low-carbon steel, 3-5kg / t steel for medium-carbon steel, replacing all fluorite and iron in the original slag-making materials Bauxite:

[0035] The preparation method and process of fluxing agent: by industrial reagent: boric anhydride (B 2 o 3 ) 10%, quicklime (CaO) 45%, magnesia (MgO) 20%, corundum powder (Al 2 o 3 ) 15% and iron scale (Fe 2 o 3 ) 10% preparation. The raw materials are weighed and dried at 200°C. After weighing, batching, crushing, mixing, and grinding into fine powders below 0.1mm, granulate to make spherical materials of 5-30mm, and dry them for use;

[0036] On a 100-ton converter, using the above-mentioned slagging flux to dissolve slag, when the initial Si content in molten steel is 0.7% (high-silicon molten iron), smelting 45 # For steel (medium carbon steel, C content 0.45%), the loading amount of metal mat...

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Abstract

The invention relates to the slagging flux of oxygen converter steelmaking and its preparation methods as well as slagging method. The slagging flux contains by percentage of quality as follow: 5~10% of B2O3, 45~50% of CaO, 20~25% of MgO, 15~20% of Al2O3, 10~15% of Fe2O3. The slagging flux is added for slagging in accordance with the ratio of 2~10kg / ton steel, and the slagging flux is added into the furnace with slagging materials in batches, i.e. it adds the first batch of slagging materials (usually the slagging materials is expected to be half of the total) and prescriptive half of the slagging flux, that is, 1~5kg / t steel, when the gun starts oxygen blowing oxygen. It adds the second batch of slagging materials and the remaining part of the slagging flux at the time of the interim blowing.

Description

technical field [0001] The invention belongs to the field of basic oxygen converter steelmaking, and specifically refers to a basic oxygen converter steelmaking slagging flux and a slagging method. Background technique [0002] Lime is used as the main alkaline flux in the basic oxygen converter steelmaking and slag making method, but due to its high melting point, especially the active CaO on the surface of the lime can be combined with the SiO in the primary slag. 2 High melting point and very dense dicalcium silicate (2CaO·2SiO 2 , melting point 2130°C) shell layer, the lime melting speed is slow, resulting in slow slag formation and long smelting cycle; at the same time, due to the slow lime melting speed, the initial slag has low alkalinity, which is not conducive to dephosphorization, desulfurization and blowing operations in the early stage of smelting Therefore, in order to speed up the melting of lime into slag, it is necessary to add a certain amount of flux. At ...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/00
Inventor 王宏明李桂荣赵玉涛戴起勋陈刚
Owner JIANGSU UNIV
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