Desulfurization refining slag for steelmaking process and addition method thereof

A technology of refining slag and desulfurization slag, which is applied in the direction of improving process efficiency, etc.

Inactive Publication Date: 2014-06-25
MAGANG (GROUP) HOLDING CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the refining slag in the prior art has a certain desulfurization effect, and is suitable for refining steel that does not require high sulfur content. However, for high-grade pipeline steel with a sulfur content requirement of 2 To reduce the melting point of refining slag, although it has a good slag melting effect, on the one hand, CaF2 erodes the lining faster, shortening the service life of the ladle; on the other hand, the volatilized F2 will endanger the health of operators and cause technical problems such as pollution to the atmosphere. In order to overcome the above technical problems, the present invention provides a desulfurization refining slag used in the steelmaking process and its adding method

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  • Desulfurization refining slag for steelmaking process and addition method thereof
  • Desulfurization refining slag for steelmaking process and addition method thereof
  • Desulfurization refining slag for steelmaking process and addition method thereof

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[0025] Such as figure 1 figure 2 As shown, the technical solution provided by the present invention is a desulfurization refining slag used in the steelmaking process, the refining slag components include CaO, SiO 2 、Al 2 o 3 , MgO, the proportion of each component is CaO=50%~60%, SiO 2 =7%~12%, Al 2 o3 =28%~33%, MgO=4%~8%. The amount of slag is set at 12-15kg / ton of steel. The CaO and Al 2 o 3 The ratio of CaO% / Al 2 o 3 %=1.8, according to the above CaO and Al 2 o 3 The ratio corresponds to the amount of lime added.

[0026] A method for adding desulfurization refining slag in the steelmaking process provided by the present invention is as follows:

[0027] (1) Add slag:

[0028] The slag is mainly added during the tapping process, and the Al 2 o 3 For slagging, the total slag amount is controlled according to 12-15kg / ton of steel. In the case of controlling the total slag amount, it is generally based on the content of active oxygen at the end of the conver...

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Abstract

The invention discloses a desulfurization refining slag for a steelmaking process. The refining slag comprises the following proportional components: 50%-60% of CaO, 7%-12% of SiO2, 28%-33% of Al2O3, and 4%-8% of MgO; the desulfurization rate of the LF (Ladle Furnace) refining slag is between 70.8%-92.0% and the content of sulfur at the finishing point ranges from 0.0004% to 0.0014%, so that excellent desulfurization is achieved and the requirements of the grade of steel for deep desulfurization can be completely met; the ratio of CaO to Al2O3 is controlled within the range of 1.7-1.9; the desulfurization refining slag has favorable adsorption and inclusion capacity.

Description

technical field [0001] The invention relates to the technical field of molten steel refining in the steelmaking process, in particular to a desulfurization refining slag used in the steelmaking process and a method for adding the same. The technical field of the present invention particularly relates to the refining slag used for refining molten steel and its adding method when smelting molten steel of high-grade pipeline steel (X80 / X70). Background technique: [0002] At present, pipeline transportation is a large-scale and cost-effective way of transporting oil and natural gas. Pipeline steel is mainly used for oil and natural gas transportation pipelines in national key projects, and has high requirements for resistance to hydrogen-induced cracking (HIC). It is the main element in high-grade oil pipeline steel that affects the steel's ability to resist hydrogen-induced cracking (HIC) and sulfur stress cracking (SSC). [0003] Sulfur exists in the form of FeS in steel, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/076
CPCY02P10/20
Inventor 蒋育翔焦兴利
Owner MAGANG (GROUP) HOLDING CO LTD
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