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A smelting method for increasing the steel scrap ratio per ton of steel

A smelting method and technology of steel scrap ratio, which is applied in iron and steel smelting and the smelting field of increasing steel scrap ratio per ton of steel, can solve problems such as poor desulfurization (sulfur) ability, large amount of deoxidation products, and high pressure of inclusion removal, etc., to achieve improvement Product quality, realize the economic benefits of the enterprise, and improve the effect of the purity of molten steel

Active Publication Date: 2019-05-24
QIANAN CITY JIUJIANG WIRE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the temperature loss in the process of the above-mentioned out-of-furnace treatment is relatively large, and the tapping temperature at the end of converter smelting needs to be greatly increased, which limits the smelting mode with high scrap steel ratio; at the same time, after the tapping temperature is increased, the free oxygen content in molten steel is high, and deoxidation products are formed If the production rhythm fluctuates, the purity of the steel will be seriously affected; in addition, the increase in tapping temperature is not conducive to the removal of P (phosphorus) by the converter, and the above-mentioned external treatment method can remove S (sulfur) Poor, in order to ensure that the percentage content of P and S meets the control requirements of finished products, it is necessary to improve the quality of molten iron entering the furnace, resulting in high cost of molten iron

Method used

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  • A smelting method for increasing the steel scrap ratio per ton of steel
  • A smelting method for increasing the steel scrap ratio per ton of steel
  • A smelting method for increasing the steel scrap ratio per ton of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The operation steps of this embodiment are as follows:

[0044] a. Blast furnace ironmaking process, the temperature in the molten iron ditch of the blast furnace is 1440°C, the amount of steel scrap added in the iron gutter is 15kg / t iron, and the composition of the molten iron: Si content is 0.25%, S content is 0.047%, and P content is 0.145%;

[0045] b. Iron mixing furnace process, the temperature of the molten iron in the iron mixing furnace is 1320°C, 20kg / t iron scrap is added to the impact area of ​​the molten iron flow during the tapping process, and the Si content of the molten iron composition is 0.30%, the S content is 0.048%, and the P content is 0.144%. ;

[0046] c. Converter steelmaking process, the amount of molten iron loaded into the converter is 61.50t, the amount of scrap steel loaded is 368kg / t iron, the amount of steel tapping is 82t, the pressure of the oxygen lance is controlled at 1.1Mpa during the smelting process, the position of the lance is...

Embodiment 2

[0052] The operation steps of this embodiment are as follows:

[0053] a. Blast furnace ironmaking process, the temperature in the molten iron trough of the blast furnace is 1480°C, the amount of steel scrap added in the molten iron trough is 18kg / t iron, and the composition of molten iron: Si content is 0.30%, S content is 0.045%, and P content is 0.149%;

[0054] b. Iron mixing furnace process, the temperature of the molten iron in the iron mixing furnace is 1330°C, and 23kg / t of scrap steel is added to the impact area of ​​the molten iron flow during the tapping process. The Si content of the molten iron composition is 0.30%, the S content is 0.043%, and the P content is 0.147%. ;

[0055] c. Converter steelmaking process, the amount of molten iron loaded into the converter is 61.30t, the amount of scrap steel loaded is 358kg / t iron, and the amount of steel tapped is 81.75t. The pressure of the oxygen lance during the smelting process is controlled at 1.1Mpa, and the positi...

Embodiment 3

[0061] The operation steps of this embodiment are as follows:

[0062] a. Blast furnace ironmaking process, the temperature in the molten iron trough of the blast furnace is 1510°C, the amount of steel scrap added in the molten iron trough is 20kg / t of iron, and the composition of molten iron: Si content is 0.37%, S content is 0.048%, and P content is 0.150%;

[0063] b. Process of iron mixing furnace. The temperature of molten iron in the iron mixing furnace is 1350°C. During the tapping process, 25kg / t of scrap steel is added to the impact area of ​​the molten iron flow. The content of Si in the molten iron is 0.39%, the content of S is 0.048%, and the content of P is 0.148%. ;

[0064] c. Converter steelmaking process, the amount of molten iron loaded into the converter is 61.10t, the amount of scrap steel loaded is 349kg / t iron, and the amount of steel tapped is 81.5t. The pressure of the oxygen lance during the smelting process is controlled at 1.1Mpa, and the position of...

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Abstract

The invention discloses a smelting method capable of increasing scrap ratio of steel per ton. Adding position and mode of steel scrap are optimized, and a LF furnace refining station light treatment process is used to perform temperature supplementing, alloying, desulfurization and impurity removal on molten steel. The method specifically includes steps: a, blast furnace ironmaking process: addingsteel scrap into an iron tap channel of a blast furnace; b, mixer furnace process: in the process when a mixer furnace discharges iron, adding steel scrap into a molten iron flow impact area of a molten iron ladle; c, converter steelmaking process: adding steel scrap into a converter; d, furnace rear argon blowing process: adding steel scrap into a furnace rear argon blowing ladle; e, LF refiningprocess: controlling treatment period of a LF finery to be shorter than or equal to molten steel pouring period, bottom-blowing argon while weakly stirring in the process of refining, and controllingalkalinity of refining slag to be within a range of 1.5-1.7, wherein adding amount of a diffusion deoxidizing agent is 0.5-1.0kg / ton of steel. By the smelting method, product quality is improved, carbon emission of steel per ton is reduced, and the objectives of improving enterprise operation benefit and social benefit are achieved.

Description

technical field [0001] The invention relates to a steel smelting method, in particular to a smelting method for increasing the ratio of steel scrap per ton of steel, and belongs to the technical field of steel making. Background technique [0002] With the rapid development of China's steel industry in the past ten years, the accumulation of domestic steel has increased significantly, and social scrap steel has increased year by year. The generation of scrap steel resources can reach 200 million tons, and this trend will continue for a long time. Especially since the beginning of this year, the state has focused on cracking down on the illegal production of medium-frequency "ground strip steel" and eliminating backward production capacity. The production capacity of hundreds of millions of tons of ground strip steel has been withdrawn. The supply of scrap steel resources exceeds demand, and the price is low. The price of scrap steel has an obvious advantage over molten iron. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04
CPCC22C33/04
Inventor 梁鹏梅忠刘坤董志才刘涛张文政陈志国冯润壮
Owner QIANAN CITY JIUJIANG WIRE