Method for dephosphorization and desulphurization in process of steel production in induction furnace

An induction furnace and dephosphorization technology, which is applied in the field of desulfurization and dephosphorization, can solve the problems that dephosphorization and desulfurization are difficult to achieve at the same time, it is difficult to dephosphorize and desulfurize at the same time, and oxidation and dephosphorization cannot be realized, achieving significant economic benefits and social benefits. Benefits, low cost, easy to achieve effect

Inactive Publication Date: 2010-06-02
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is precisely because the requirements of dephosphorization and desulfurization in terms of oxidation and temperature are opposite, which brings difficulties to simultaneous dephosphorization and desulfurization.
In addition, both dephosphorization and desulfurization require high-basic slag, so desulfurization and dephosphorization in the induction furnace must produce high-basic slag, which is only possible when the induction furnace lining is made of alkaline (MgO) or neutral (Al 2 o 3 ) material may be used, and the use of acid lining (SiO 2 ) induction furnace can not be desulfurized or dephosphorized in the furnace
Therefore, at present, induction furnace steelmaking generally does not carry out desulfurization or dephosphorization in the furnace, but adopts the method of processing outside the furnace, such as prior art 1 (Chinese patent authorization announcement number CN100434540C, acid induction furnace desulfurization method outside the furnace) and existing Technology 2 (Chinese Patent Application No. 200910235079.5, a kind of desulfurization agent and desulfurization method outside the induction furnace steelmaking furnace) all adopts the method of desulfurization outside the furnace, and these desulfurization methods outside the furnace can reduce the sulfur content to a lower level, but Since the molten steel has been deoxidized during desulfurization, it is a strong reducing atmosphere, so oxidative dephosphorization cannot be achieved, so it is difficult to achieve dephosphorization and desulfurization outside the furnace at the same time
Prior Art 3 (Chinese Patent Application No. 2006100

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this embodiment, dephosphorization and desulfurization pretreatment is carried out for 1 ton of intermediate frequency induction furnace steelmaking, and the actual weight of molten iron is 1 ton.

[0042] The ratio of the dephosphorization agent used is: active lime 50%, iron oxide scale 40%, boric anhydride 10%.

[0043] The addition amount of dephosphorization agent is 10kg, and the dephosphorization treatment time is 20 minutes.

[0044] The ratio of the desulfurizer used is: active lime 50%, calcium carbide block 30%, aluminum ash 20%.

[0045] The amount of desulfurization agent added is 15kg, and the desulfurization treatment time is 30 minutes.

[0046] The final phosphorus content of molten steel was determined to be 0.01%, and the final sulfur content was 0.008%.

[0047] For contrast adopting the dephosphorization of the present invention, desulfurization effect, adopt same metal raw material and equipment, carry out the comparative experiment of not add...

Embodiment 2

[0049] In this embodiment, dephosphorization and desulfurization pretreatment is carried out for steelmaking in a 3-ton intermediate frequency induction furnace, and the actual weight of molten iron is 3 tons.

[0050] The ratio of the dephosphorization agent used is: active lime 55%, iron oxide scale 40%, boric anhydride 5%,

[0051] The addition amount of dephosphorization agent is 24kg, and the dephosphorization treatment time is 20 minutes.

[0052] The ratio of desulfurizer used is: active lime 60%, calcium carbide block 25%, aluminum ash 15%

[0053] The amount of desulfurization agent added is 36kg, and the desulfurization treatment time is 40 minutes.

[0054] The final phosphorus content of molten steel was determined to be 0.009%, and the final sulfur content was 0.006%.

[0055] For contrast adopting the dephosphorization of the present invention, desulfurization effect, adopt same metal raw material and equipment, carry out the comparative experiment of not addin...

Embodiment 3

[0057] In this embodiment, the dephosphorization and desulfurization pretreatment is carried out for 10 tons of induction furnace steelmaking, and the actual weight of molten iron is about 10 tons.

[0058] The ratio of the dephosphorization agent used is: active lime 60%, iron oxide scale 30%, boric anhydride 10%,

[0059] The addition amount of dephosphorization agent is 100kg, and the dephosphorization treatment time is 25 minutes.

[0060] The proportion of desulfurizer used is: active lime 60%, calcium carbide block 20%, aluminum ash 20%

[0061] The amount of desulfurization agent added is 100kg, and the desulfurization treatment time is 45 minutes.

[0062] The final phosphorus content of molten steel was determined to be 0.008%, and the final sulfur content was 0.008%.

[0063] For contrast adopting the dephosphorization of the present invention, desulfurization effect, adopt same metal raw material and equipment, carry out the comparative experiment without adding d...

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Abstract

The invention provides a method for dephosphorization and desulphurization in the process of steel production in an induction furnace, which is characterized by comprising the following steps of: during the smelting period and the initial period of total meltdown of charging materials, controlling the temperature of molten steel to below 1,450 EDG C, performing dephosphorization treatment on a liquid steel by using a dephosphorizing agent consisting of lime-ferric oxide-boron anhydrous, and controlling the phosphorous content in the liquid steel to below 0.01 percent; after finishing the dephosphorization, absolutely deslagging, then rapidly raising the temperature of the liquid steel to 1, 500 to 1, 600 DEG C; and performing pre-deoxidation and alloying on the liquid steel, and then adding the desulphurizing agent consisting of lime-calcium carbide-aluminum ash, performing the desulphuration on the liquid steel, and reducing the phosphorous content in the liquid steel to below 0.08 percent. The method has the advantages of combining the smelting characteristics of the induction furnace, fully utilizing favorable thermodynamic conditions of dephosphorization and desulphurization, realizing high-efficiency dephosphorization and desulphurization by slagging and greatly improving the quality of the liquid steel; and meanwhile, the method also has the advantages of low cost, less equipment investment, simple operation, easy implementation, and obvious economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the technical field of induction furnace steelmaking, and in particular relates to a dephosphorization and desulfurization method used in the induction furnace steelmaking process. Background technique [0002] For most types of steel, phosphorus and sulfur in steel are harmful elements, which will cause serious harm to the comprehensive performance of steel. Therefore, reducing the content of sulfur and phosphorus in steel as much as possible is of great significance to improve the quality of steel . Traditional induction furnace steelmaking is limited by factors such as smelting conditions and furnace lining refractory materials, so it is difficult to achieve simultaneous desulfurization and dephosphorization in the furnace. Due to the insurmountable difficulties in reductive dephosphorization in steelmaking at present, the traditional oxidation dephosphorization method is required for steelmaking dephosphorization, and ther...

Claims

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Application Information

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IPC IPC(8): C21C7/064
Inventor 王宏明李桂荣赵玉涛
Owner JIANGSU UNIV
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