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Deep desulfurization method using premelted slag in RH vacuum furnace

A technology of deep desulfurization and pre-melting slag, applied in the field of deep desulfurization of pre-melting slag in RH vacuum furnace, to achieve the effect of obvious desulfurization effect, high desulfurization rate and reducing environmental pollution

Inactive Publication Date: 2009-06-24
QINHUANGDAO SHOUQIN METAL MATERIAL +1
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for deep desulfurization of pre-melted slag in RH vacuum furnace, which solves the problems of deep desulfurization of molten steel in smelting ultra-pure steel in RH vacuum furnace and desulfurization of RH vacuum furnace without top gun powder spraying function. For steels with strict content requirements, the process flow is: converter→LF furnace→RH furnace→casting machine

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Embodiment Construction

[0020] For the RH furnace without top gun powder spraying device, when producing low-sulfur molten steel, the process flow of converter→LF furnace→RH furnace→casting machine can be adopted, and at the same time, 300-800Kg / The pre-melted slag of t is subjected to normal molten steel vacuum treatment at the same time, and the effect of deep desulfurization of molten steel can be realized.

[0021] RH pre-melting slag desulfurization test data in Shouqin Company:

[0022] date Stoves steel type The amount of pre-melted slag added RH into the station S, % S after RH removal, % Desulfurization rate 08.6.14 8P04178 X70 300Kg 0.0025 0.0018 28.0％ 08.6.16 8Q04619 X70 300Kg 0.0023 0.0019 17.4％ 08.6.16 8N03952 X70 300Kg 0.0034 0.0028 17.6％ 08.6.18 8P04289 X70 600Kg 0.0043 0.0039 9.3％ 08.6.18 8P04273 Q345225 600Kg 0.0052 0.0043 17.3％ 08.6.19 8Q4671 X70 500Kg 0.0051 0.0035 31.4％

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Abstract

The invention relates to a pre-melted slag deep desulphurization method in a RH vacuum furnace, belonging to the vacuum steelmaking technical field. 300-800Kg / t of pre-melted desulphurized slag is added by an alloy feeding chute during the vacuum treatment of the RH furnace to realize the molten steel deep desulphurization. The pre-melted desulphurized slag comprises the following components by weight percentage of 55-60% of CaO, 15-25% of Al2O3, 2-8% of SiO2, 0-5% of MgO, 0-0.06% of S, 0-0.5% of water and 0-1.89% of impurities. The pre-melted slag deep desulphurization method has the advantages of simple equipment, no powder injection desulphurization top lance and low operating cost. Compared with a powder injection desulphurization mode, the pre-melted slag deep desulphurization method has larger added pre-melted slag amount and is beneficial for improving the desulphurization rate of molten steel.

Description

technical field [0001] The invention belongs to the technical field of vacuum steelmaking, and in particular provides a method for deep desulfurization of pre-melted slag in a RH vacuum furnace. Background technique [0002] RH vacuum furnace treatment of molten steel is a process of vacuum treatment of molten steel that has developed rapidly in China in recent years and is used in the refining process of steelmaking. Its main functions are degassing, alloying, chemical heating, removal of inclusions, desulfurization, etc. Among them, powder desulfurization has the advantages of rapidity and stability, but its equipment cost and operating cost are high, and the effect of deep desulfurization is not obvious. Relevant references include "Shanghai Metal" - 2005, Vol. 27, No. 4, pp. 54-57, "Powder Spray Desulfurization in Molten Steel RH Refining Process". Contents of the invention [0003] The purpose of the present invention is to provide a method for deep desulfurization ...

Claims

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Application Information

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IPC IPC(8): C21C7/064
Inventor 石树东许晓东朱志远王浩然蒋海涛孙硕猛史志强
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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