Steel ladle slag reducing agent with high calcium oxide content, and preparation method thereof
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A technology of high calcium oxide and reducing agent, which is applied in the field of converter steelmaking, can solve problems such as imperfections, and achieve the effect of improving cleanliness and good slag-gold reaction
Active Publication Date: 2013-12-25
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
[0014] The ladle slag reducing agent disclosed in the above prior art is not yet perfect in terms of reducing ability, rapid slagging, and sufficient removal of impurities
Method used
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Embodiment 1
[0035] A ladle slag reducing agent with high calcium oxide content, Al 42wt%, CaO 28wt%, SiO 2 0.5wt%, Al 2 o 3 15wt%, CaF 2 8wt%, MgO 4wt%, other balance.
[0036] The amount of ladle slag added is 4kg / t.s, the T-Fe content in the ladle slag is 23.6% before adding the ladle slag reducing agent, and the T-Fe content in the ladle slag is 1.5% after adding the ladle slag reducing agent. Other indicators of molten steel after refining are shown in Table 2.
Embodiment 2
[0038] A ladle slag reducing agent with high calcium oxide content, Al 48wt%, CaO 21.6wt%, SiO 2 1.0wt%, Al 2 o 3 20wt%, CaF 2 5.5wt%, MgO 1.0wt%, other balance.
[0039] The amount of ladle slag added is 2kg / t.s, the T-Fe content in the ladle slag is 25.7% before adding the ladle slag reducing agent, and the T-Fe content in the ladle slag is 3.2% after adding the ladle slag reducing agent. Other indicators of molten steel after refining are shown in Table 2.
Embodiment 3
[0041] A ladle slag reducing agent with high calcium oxide content, Al 46.5wt%, CaO 18wt%, SiO 2 2.0wt%, Al 2 o 3 22wt%, CaF 2 3.0wt%, MgO 3.1wt%, other balance.
[0042] The amount of ladle slag added is 2.5kg / t.s, the T-Fe content in the ladle slag is 24.9% before adding the ladle slag reducing agent, and the T-Fe content in the ladle slag is 1.8% after adding the ladle slag reducing agent. Other indicators of molten steel after refining are shown in Table 2.
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Abstract
The invention provides a steel ladle slag reducing agent with high calcium oxide content, which comprises the components by mass percent: 42-48% of Al, 18-28% of CaO, 0.5-2.0% of SiO2, 15-22% of Al2O3, 3-8% of CaF2 and 1-4% of MgO. The steel ladle slag reducing agent has high calcium oxide content, and other components are synthesized at the same time, so that the steel ladle slag reducing agent is good in a metal-slag reaction and rapid in slagging, and is capable of realizing the reduction on steel ladle slag and giving full play to the desulfuration and deoxidation functions of steel ladle slag on molten steel as well as the adsorption function of the steel ladle slag on impurities; therefore, the cleanliness of the molten steel can be improved.
Description
technical field [0001] The invention relates to the field of converter steelmaking, in particular to a reducing agent for modifying ladle slag and a modification method using the reducing agent. Background technique [0002] The smelting of low-carbon ultra-low sulfur steel generally adopts the process of molten iron pretreatment - converter blowing - ladle furnace (LF) refining + RH vacuum refining. The molten iron that has been pretreated by desiliconization and desulfurization is added to the converter for blowing. After reaching the appropriate temperature and carbon content, the molten steel is tapped from the converter and enters the ladle. During the tapping process of the converter, a large amount of oxidizing converter slag will enter the ladle. In the subsequent LF and RH vacuum refining processes, these oxidative ladle slags will pollute the molten steel, form inclusions, and affect the quality of molten steel. It reacts as follows: [0003] y(FeO)+x[M]=M x o ...
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