Sulfur-fixing agent for hot metal pretreatment of magnesium injection and deep desulphurization and desulphurization method thereof
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A technology of molten iron pretreatment and sulfur-fixing agent, which is applied in the process optimization of molten iron spraying magnesium desulfurization, especially deep desulfurization. Small amount of slag, difficult to remove and other problems, to achieve the effect of improving sulfur absorption and fixation capacity, improving efficiency, and better sulfur absorption and fixation capacity
Inactive Publication Date: 2009-03-25
SHOUGANG CORPORATION
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At present, the use of passivated metal magnesium particles is the trend of desulfurization agent. It has the advantages of small dosage, small amount of slag, high desulfurization efficiency, and lower temperature, but it also has the disadvantages of small amount of final slag and is difficult to remove. It is easy to cause sulfur back and deteriorate the desulfurization effect, so it is necessary to improve the existing technology
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Embodiment 1
[0014] First add 2.5kg / t iron sulfur fixative in the ladle, the chemical composition (percentage by weight) is:
[0015] Ca0 MgO SiO 2 al 2 o 3 CaF 2 S 86.63 1.1 2.76 1.67 9.2 0.022
[0016] The molten iron is blended into the ladle from the torpedo tank, and the percentage by weight of sulfur in the molten iron is 0.042%;
[0017] Magnesium spray desulfurization treatment, after adding slagging agent, first stir with slagging machine and then remove slag. Most of the slag is agglomerated, which is very easy to remove. After slag removal, the sulfur content of molten iron sampling is 0.0035%;
[0018] The molten iron is loaded into the converter, and the sulfur content of the molten iron sample is 0.004%;
[0019] The amount of sulfur back is 0.0005%.
Embodiment 2
[0021] First add 2.5kg / t iron sulfur fixative in the ladle, the chemical composition (percentage by weight) is:
[0022] CaO MgO SiO 2 Al 2 o 3 CaF 2 S 78.63 4.1 4.01 1.67 11.2 0.012
[0023] The molten iron is blended into the ladle from the torpedo tank, and the percentage by weight of sulfur in the molten iron is 0.032%;
[0024] Spray magnesium for desulfurization treatment, then add slagging agent first and then stir, most of the slag is agglomerated, and the sulfur content of molten iron sampling after slag removal is 0.003%;
[0025] The molten iron is loaded into the converter, and the sulfur content of the molten iron sample is 0.003%;
[0026] Return sulfur to zero.
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Abstract
The invention relates to a sulfur-fixing agent for hot metal pretreatment magnesium injection deep desulphurization and a desulphurization method, which pertains to the technical field of hot metal pretreatment in the steelmaking process. The sulfur-fixing agent is added before hot metal charging or during hot metal charging in the hot metal pretreatment and the addition range is 2.0 kg / t to 4.0 kg / t iron which contains the following components by the weight percentages: CaO: 68 percent to 90 percent; MgO: 5 percent to 12 percent, SiO2: 1 percent to 5 percent, CaF2: 8 percent to 12 percent, Al2O3: 0 percent to 3 percent, MnO: 0 percent to 2 percent, S: less than 0.025 percent, and P2O5: less than 0.06 percent. The weight percentages of various slagging constituents in the sulfur-fixing agent are as follows: quick lime: 80 percent to 95 percent and fluorite: 5 percent to 20 percent. The sulfur-fixing agent has the advantages that: slag formed by adding the sulfur-fixing agent into the molten iron after magnesium injection has very high sulfur absorption capability, relatively small viscosity and relatively low melting point; after magnesium injection, a slag conglomeration agent is added to cause the slag to conglomerate into blocks which are easy to remove and resulfurization is prevented.
Description
technical field [0001] The invention relates to the technical field of molten iron pretreatment in steelmaking processes, and in particular provides a magnesium-spraying deep desulfurization-fixing agent for molten iron pretreatment and a desulfurization method thereof, which are suitable for process optimization of molten iron spraying magnesium desulfurization, especially deep desulfurization. Background technique [0002] At present, the pretreatment desulfurization of molten iron mainly includes the input method, the method of rotating and stirring the molten iron container, the method of mechanical stirring with a stirrer, and the injection method. Especially in recent years, injection has been widely used. It is a desulfurization method that sprays into the deep part of molten iron to stir the molten iron and desulfurizer fully. Commonly used desulfurizers include lime powder, calcium carbide powder, soda powder, metal magnesium, and lime-based composite desulfurizers....
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