Slag-pushing refining process under protection of inert gas

A technology of inert gas and slag topping, applied in the direction of improving process efficiency, etc., can solve the problems of not having the steps of slag washing and refining, and the unavoidable secondary oxidation of molten steel

Inactive Publication Date: 2003-11-05
白瑞国
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Problems solved by technology

[0002] The traditional slag washing and refining process has no inert gas protection, so the secondary oxidation of molten ste

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0018] 38 tons of HRB335 molten steel were smelted in a 40-ton converter. The molten steel enters the ladle after final deoxidation. Add slag adjusting agent to adjust the alkalinity of slag to 2.5 during the tapping process, and make the slag layer thickness about 50mm. Put the cover on the slag surface, and then fill the space between the cover and the slag surface with Ar. Make its lower edge close to the steel-slag interface. Add Al particles to the slag to make the (Feo) content in the slag 2.0%. Blow argon into the molten steel to fully mix the steel slag. The refining process was terminated after 10 minutes of argon blowing. The T[o] content in the steel before and after treatment was measured with an EMA620W analyzer, and the deoxidation efficiency was calculated to be 43%; the [S] content in the steel before and after treatment was analyzed, and the desulfurization efficiency was calculated to be 14.2%. The temperature during the treatment was reduced to 19°C.

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Abstract

The slag-pushing refining process under protection of inert gas includes forming slag containing FeO less than 4.0 % and with R=1.8-3.5; covering the slag with one hood; inflating inert gas between the slag and molten steel; and blowing argon to make the slag and molten steel mixed fully. The technological process of the present invention has the advantages of powerful deoxygenation, desulfurizing and impurity eliminating capacity.

Description

technical field [0001] The invention relates to a top slag refining process, in particular to a top slag refining process under the protection of an inert gas. Background technique [0002] The traditional slag washing and refining process has no inert gas protection, so the secondary oxidation of molten steel cannot be avoided; while the refining process using inert gas protection does not have the step of slag washing and refining. Steel workers have been looking forward to a top slag refining process under gas protection to further remove T[O], [S] and inclusions in molten steel. Contents of the invention [0003] The purpose of the present invention is to provide an improved top slag refining process under the protection of inert gas. [0004] The present invention is achieved like this: [0005] 1) form (Feo)≤4.0% (weight, the same below) in the container that fills molten steel, the top slag that alkalinity is 1.5-3.5; [0006] 2) Add a cover above the container a...

Claims

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Application Information

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IPC IPC(8): C21C7/076C21C7/10
CPCY02P10/20
Inventor 白瑞国
Owner 白瑞国
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