Sulfur-fixing agent for hot metal pretreatment of magnesium injection and deep desulphurization and desulphurization method thereof
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
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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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