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Desulphurization method for ladle refining furnace

A ladle refining furnace and refining furnace technology, which is applied in the field of desulfurization of ladle refining furnaces, can solve the problems of abnormal composition, long waiting time for samples, deviation in empirical judgment, etc., and achieve the effect of shortening the processing cycle.

Inactive Publication Date: 2014-10-15
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] The object of the present invention is to provide a desulfurization method for a ladle refining furnace to solve the problems in the prior art that the waiting time for samples is long, resulting in long processing time in the ladle refining furnace, deviations in empirical judgments, and possibly out-of-standard components

Method used

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  • Desulphurization method for ladle refining furnace
  • Desulphurization method for ladle refining furnace
  • Desulphurization method for ladle refining furnace

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Ladle refining furnace treatment starts by adding 1500Kg of pre-melted slag, appropriate amount of aluminum-iron alloy, appropriate amount of aluminum slag, appropriate amount of lime, blowing argon and stirring, powering on and heating for 15-25 minutes to take slag samples.

[0064] Appearance: vitreous body.

[0065] Surface: The surface is transparent sky blue or bright earthy yellow; the color of the section is close to the color of the surface.

[0066] Brittleness: Poor.

[0067] 1) It shows that the oxidation property in the slag is low, the alkalinity is slightly low, and the content of FeO%+MnO% in the slag is less than 2%.

[0068] 2) Adjust the aluminum content in molten steel to prevent free oxygen from rising in molten steel;

[0069] 3) Add appropriate amount of lime when the temperature rises later to increase the alkalinity of slag;

[0070] 4) Add an appropriate amount of aluminum slag and further reduce the oxidation of slag, the temperature reache...

Embodiment 2

[0073] Ladle refining furnace treatment starts by adding an appropriate amount of pre-melted slag, an appropriate amount of aluminum-iron alloy, an appropriate amount of aluminum slag, and an appropriate amount of lime, blowing argon and stirring, powering on and heating for 15-25 minutes to take a slag sample. Slag sampling method such as figure 1 shown.

[0074] Appearance: Non-vitreous.

[0075] Surface: The surface is khaki; the section is gray and darker than the surface.

[0076] Brittleness: good

[0077] 1) It shows that the oxidation property in the slag is very low, the alkalinity is moderate, and the content of FeO%+MnO% in the slag is less than 1%.

[0078] 2) Add a batch of 150kg aluminum-iron alloy to adjust the aluminum content in the molten steel to prevent the increase of free oxygen in the molten steel;

[0079] 3) Add 200-300kg of lime, slightly increase the alkalinity of slag, and the temperature reaches the final target of treatment, just strong stirri...

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Abstract

A disclosed desulphurization method for ladle refining furnace comprises the following steps: step 1, adding premelted slag, aluminium-iron alloy, aluminium slag and lime at the beginning of furnace processing by the refining furnace; step 2, blowing argon and stirring, electrifying and heating; step 3, taking a slag sample; and step 4, adjusting desulphurization measure according to the morphology of the slag sample. By employing the technical scheme, a rapid determination method is provided for rapid desulphurization and slagging of a low-alkalinity ladle refining furnace, and the furnace processing period of the ladle refining furnace is shortened.

Description

technical field [0001] The invention relates to a blast furnace refining method, in particular to a ladle refining furnace desulfurization method. Background technique [0002] Ladle refining furnace (LF furnace) refining slag is mainly composed of basic slag system, desulfurizer, reducing agent, foaming agent and flux. Its basic functions are: deep desulfurization, deep deoxidation, changing the shape of inclusions, preventing secondary oxidation and heat preservation of molten steel, removing non-metallic inclusions in steel, and purifying molten steel; foaming submerged arc, stabilizing arc and heat transfer, prevent heat loss, ensure smelting temperature, and improve thermal efficiency. [0003] LF furnace has the following main functions: [0004] (1) It has the function of heating up molten steel and keeping it warm. The molten steel obtains new heat energy through electric arc heating, which not only enables the addition of alloys and adjustments in the composition...

Claims

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Application Information

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IPC IPC(8): C21C7/064
Inventor 陆国弟王松泰
Owner BAOSHAN IRON & STEEL CO LTD