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Desulfurizing agent for non-oriented silicon steel

A technology of oriented silicon steel and desulfurizing agent, which is applied in the field of metallurgical steelmaking, can solve the problems of molten steel carburization, desulfurizing agent can not meet the desulfurization of non-oriented silicon steel, easy to absorb moisture, etc., to achieve rapid desulfurization reaction, good deoxidation function, good melting performance Effect

Active Publication Date: 2008-03-05
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Traditional desulfurizers cannot meet the desulfurization requirements of non-oriented silicon steel, because traditional desulfurizers are non-vacuum refining processes, so it will cause carburization of molten steel (carburization caused by molten steel desulfurization process is 20ppm), nitrogen increase
In addition, granular lime is used as a desulfurizer, which is easy to absorb moisture during transportation and storage, which affects the desulfurization effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Prepare desulfurizer, its weight percentage is: CaO: 58.0%; SiO 2 : 3%; Al 2 o 3 : 8.0%;

[0040] CaF 2 : 30.0%; Mg: 2%; C: 0.015%. The particle size of the desulfurizer is between 5 and 12mm.

[0041] Add 1.0% of silicone oil to passivate the surface of the desulfurizer so that the surface is covered with a hydrophobic protective layer and has moisture-proof performance.

[0042] After the molten steel undergoes vacuum decarburization and vacuum deoxidation treatment, the oxygen in the molten steel is reduced to a certain level, and at this time, the desulfurizing agent in Example 1 is added to carry out vacuum desulfurization treatment on the molten steel.

[0043] The above-mentioned desulfurizer is tested, and the test conditions are as follows: molten steel is at the 300t RH-KTB station, and the initial sulfur content in the molten steel is 0.0020%-0.0050% (low sulfur condition).

[0044] the experiment shows:

[0045] The sulfur content of the molten steel ...

Embodiment 2

[0047] Prepare desulfurizer, its weight percentage is: CaO: 52.7%; SiO 2 : 5.3%; Al 2 o 3 : 13.7%; CaF 2 : 23.6%; Mg: 3.9%; C: 0.012%. The particle size of the desulfurizer is between 3 and 10 mm.

[0048] Add 0.64% of silicone oil to passivate the surface of the desulfurizer so that its surface is covered with a hydrophobic protective layer and has moisture-proof performance.

[0049] Test condition is identical with embodiment 1, does not repeat them one by one here, test shows:

[0050]The sulfur content of the molten steel is 0.0026% before the desulfurization treatment in the RH-MFB refining process. After the desulfurization treatment, the sulfur content in the molten steel is reduced to 0.0014%, and the desulfurization efficiency is 46.2%. The amount is 3ppm.

Embodiment 3

[0052] Prepare desulfurizer, its weight percentage is: CaO: 45.0%; SiO 2 : 8.0%; Al 2 o 3 : 23.0%; CaF 2 : 18.0%; Mg: 6.0%; C: 0.014%. The particle size of the desulfurizer is between 5mm and 15mm.

[0053] Add 0.30% of silicone oil to passivate the surface of the desulfurizer so that its surface is covered with a hydrophobic protective layer and has moisture-proof performance.

[0054] Test condition is identical with embodiment 1, does not repeat them one by one here, test shows:

[0055] The sulfur content of molten steel is 0.0034% before desulfurization treatment in the RH-MFB refining process. After desulfurization treatment, the sulfur content in molten steel is reduced to 0.0019%, and the desulfurization efficiency is 44.1%. The amount is 4ppm.

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Abstract

The non-oriented silicon steel desulfurizer consists of CaO 45-58 wt%, Al2O3 8-23 wt%, CaF2 15-30 wt%, SiO2 3-8 wt%, Mg 2-6 wt%, C not more than 0.015 wt%. Before it is applied in desulfurizing molten steel, the silicon steel desulfurizer is surface deactivated via adding organic solvent in 0.3-1.0 wt%. The desulfurizer containing metal Mg has excellent deoxidation function and excellent molten steel desulfurizing effect. The desulfurizer with one hydrophobic protecting layer formed through the deactivation treatment has high damp-proofing effect and high desulfurizing reaction performance.

Description

technical field [0001] The invention relates to a desulfurizer, in particular to a desulfurizer for desulfurizing non-oriented silicon steel, which belongs to the field of metallurgy and steelmaking. Background technique [0002] Silicon steel is widely used in the power electronics industry. The core technology of its steelmaking process is the full removal of harmful elements and the reasonable control of its inclusions. On this premise, it can play the role of beneficial elements to improve the performance of silicon steel. Sulfur is a detrimental element to most steel grades. Desulfurization of molten steel during the refining process is the main method to control the sulfur content in steel. [0003] The traditional desulfurization process mainly adopts the ladle furnace process and powder spraying desulfurization process, and desulfurizes molten steel under non-vacuum conditions. The desulfurizer used is generally (50%-70%) CaO-(30%-50% )CaF 2 , namely lime-fluorite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064
Inventor 黄宗泽曹伟
Owner BAOSHAN IRON & STEEL CO LTD
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