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Method for diluting aluminum grain deoxidizing agent

A technology of deoxidizer and aluminum particles, which is applied in the field of metallurgy, can solve the problems of lowering the quality of molten steel, unstable aluminum deoxidation, returning phosphorus, returning silicon, etc., and achieves the effects of accelerating diffusion, reducing enrichment time, and promoting foaming

Inactive Publication Date: 2019-03-19
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are two disadvantages in this method: 1) the aluminum particles floating on the surface of the slag are under the action of high-temperature furnace gas and negative pressure dust removal, and the combustion loss is relatively large; 2) the aluminum particles are added from the furnace door on one side of the ladle, making the ladle The partial enrichment of aluminum in one side of the top slag is likely to cause phosphorus and silicon reversion, reduce the quality of molten steel, and the deoxidation of aluminum is unstable

Method used

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  • Method for diluting aluminum grain deoxidizing agent
  • Method for diluting aluminum grain deoxidizing agent
  • Method for diluting aluminum grain deoxidizing agent

Examples

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Effect test

Embodiment 1

[0041] Taking the refining of aluminum-containing steel SWRCH22A as an example, specific technical parameters such as refining entry temperature, entry oxygen content, amount of mixture of aluminum particles and recarburizer, lime, modifier, primary heating time, and slag color after heating are shown in Table 6.

[0042] Table 6 Example 1 main technical parameters

[0043]

[0044] Refining station and sampling after refining once heated, the changes of carbon and acid-soluble aluminum content in molten steel are shown in Table 7.

[0045] Table 7 Example 1 Refining entering the station and after heating once, molten steel carbon, acid soluble aluminum content and aluminum element absorption rate

[0046]

[0047] Regardless of the oxidation of aluminum elements, the amount of aluminum added by adding 50kg of aluminum grains to molten steel: 50÷105000 (average tapping amount)×100%=0.048%;

[0048] Actual increase in aluminum content: 0.021%-0.013% = 0.008%;

[0049] A...

Embodiment 2

[0051] Taking the refining process of aluminum-containing steel SWRCH22A as an example, see Table 8 for specific technical parameters such as refining entry temperature, entry oxygen content, mixture amount of aluminum particles and recarburizer, lime, modifier, primary heating time, and slag color after heating. .

[0052] Table 8 Example 2 main technical parameters

[0053]

[0054] Sampling after refining and primary heating, the changes of carbon and acid-soluble aluminum content in molten steel are shown in Table 9.

[0055] Table 9 Example 2 Refining into the station and after heating once, molten steel carbon, acid-soluble aluminum content and aluminum element absorption rate

[0056]

[0057] Regardless of the oxidation of aluminum elements, the amount of aluminum added by adding 60kg of aluminum grains to molten steel: 60÷105000 (average tapping amount)×100%=0.057%;

[0058] Actual increase in aluminum content: 0.023%-0.012% = 0.011%;

[0059] Absorption rate...

Embodiment 3

[0061] Taking the refining process of aluminum-containing steel SWRCH22A as an example, the specific technical parameters such as refining entry temperature, entry oxygen content, mixture amount of aluminum particles and recarburizer, lime, modifier, primary heating time, and slag color after heating are shown in Table 10 .

[0062] Table 10 Embodiment 3 main technical parameters

[0063]

[0064] Sampling after refining and primary heating, the changes of carbon and acid-soluble aluminum content in molten steel are shown in Table 11.

[0065] Table 11 Example 3 Refining enters the station and after heating once, molten steel carbon, acid soluble aluminum content and aluminum element absorption rate

[0066]

[0067] Regardless of the oxidation of aluminum elements, the amount of aluminum added by adding 70kg of aluminum grains to molten steel: 70÷105000 (average tapping amount)×100%=0.067%;

[0068] Actual increase in aluminum content: 0.025%-0.013% = 0.012%;

[0069...

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Abstract

The invention discloses a method for diluting an aluminum grain deoxidizing agent. The method comprises the following steps: before aluminum-contained steel enters an LF furnace for refining, aluminumgrains and a carburant are uniformly mixed according to a mass ratio of 2-3: 1; and after molten steel enters a heating station, the aluminum grain and carburant mixture of 0.75-1.0 kg / t steel is fedin the center position of a ladle along an electrode descending inlet. The aluminum grains are mixed with the carburant, so that the number of the aluminum grains in unit volume is reduced, the combustion loss of the aluminum grains on the surface of slag is reduced, the absorption rate of the aluminum grains is increased, and the reduction of the production cost is achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for diluting an aluminum particle deoxidizer. Background technique [0002] Aluminum is a strong deoxidizer commonly used in the metallurgical production process. After contacting molten steel or steel slag, it will quickly react with the oxygen in it to form aluminum oxide. [0003] In order to facilitate long-distance transportation and prevent the aluminum particle deoxidizer from getting wet, the aluminum particle deoxidizer is generally packed in bags (10kg / bag). [0004] In the refining process of aluminum-containing steel LF furnace, aluminum particles are usually used as the deoxidizer of slag to make reduced slag. But there are two disadvantages in this method: 1) the aluminum particles floating on the surface of the slag are under the action of high-temperature furnace gas and negative pressure dust removal, and the combustion loss is relatively...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/00
CPCC21C7/0006C21C7/0025C21C7/0037C21C7/06
Inventor 李亚厚康毅方鸣连庆靳刚强
Owner HEBEI IRON AND STEEL
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