Method for converter steelmaking by directly using bottom slag produced by converter

A converter steelmaking and furnace bottom slag technology, which is applied in the field of iron and steel metallurgy, can solve problems such as difficulty in mixing molten iron, safety accidents, and influence on smelting operations, so as to avoid splashing accidents and hidden safety hazards, improve operation levels, and improve smelting levels Effect

Active Publication Date: 2015-12-02
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are also the following deficiencies: 1. The slag retention method is to leave the final slag of the converter with high temperature, high alkalinity and high FeO content in the previous furnace for the next furnace, but in the process of mixing molten iron, due to the high temperature of the slag, the FeO in the medium or the oxygen remaining in the molten steel in the furnace can easily react with the carbon in the molten iron in an unbalanced carbon-oxygen reaction, and a large amount of CO gas is instantly generated to carry the slag and molten iron out of the converter, causing explosive splashing accidents and safety accidents ;2. In the slag retention method,

Method used

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  • Method for converter steelmaking by directly using bottom slag produced by converter
  • Method for converter steelmaking by directly using bottom slag produced by converter
  • Method for converter steelmaking by directly using bottom slag produced by converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) After the converter is tapped, empty the slag in the converter;

[0042] 2) To start the next furnace of converter steelmaking, first put the bottom slag produced by the converter into the converter together with scrap steel, control the addition of the bottom slag to 5.7t, and control the bottom slag to include the following components by weight percentage: element Fe : 39.5%, unmelted lime: 7.1%, unmelted lightly burned dolomite: 5.8%, FeO: 6.1%, CaO: 18.2%, SiO 2 : 6.1%, MgO: 4.9%, MnO: 1.5%, P 2 o 5 : 1.8%, CaS: 0.15%;

[0043] Then add molten iron, the composition and quality of molten iron are shown in Table 1, then lower the gun to supply oxygen, and start blowing;

[0044] Control the amount of ore added in the early stage of smelting to 2.6kg / ton of steel, reduce the amount of lime added by 22%, and reduce the amount of dolomite added by 17%, in order to make the operation of the blowing process stable and obtain the ideal end point temperature and compos...

Embodiment 2

[0052] 1) After the converter is tapped, empty the slag in the converter;

[0053] 2) Start the next furnace of converter steelmaking, first put the bottom slag produced by the converter together with scrap steel into the converter, control the addition of the bottom slag to 6.5t, and control the bottom slag to include the following components in weight percentage: element Fe : 35%, unmelted lime: 9.5%, unmelted lightly burned dolomite: 4.2%, FeO: 7.3%, CaO: 16.3%, SiO 2 : 7.2%, MgO: 4.1%, MnO: 2.3%, P 2 o 5 : 1.78%, CaS: 0.23%;

[0054] Then add molten iron, the composition and quality of molten iron are shown in Table 2, then lower the gun to supply oxygen, and start blowing;

[0055] Control the amount of ore added in the early stage of smelting to 1.8kg / ton of steel, reduce the amount of lime added by 27%, and control the amount of dolomite added by 20%, in order to make the operation of the blowing process stable and obtain the ideal end point temperature and compositi...

Embodiment 3

[0063] 1) After the converter is tapped, empty the slag in the converter;

[0064] 2) Start the next furnace of converter steelmaking. First, the bottom slag produced by the converter and steel scrap are loaded into the converter together. The amount of the bottom slag is controlled to be 8t, and the bottom slag is controlled to include the following components by weight percentage: element Fe: 30.1%, unmelted lime: 10.8%, unmelted lightly burned dolomite: 3.2%, FeO: 8.8%, CaO: 12.2%, SiO 2 : 7.8%, MgO: 3.1%, MnO: 2.5%, P 2 o 5 : 1.1%, CaS: 0.26%;

[0065] Then add molten iron, the composition and quality of molten iron are shown in Table 3, then lower the gun to supply oxygen, and start blowing;

[0066] Control the amount of ore added in the early stage of smelting to 1.2kg / ton of steel, reduce the amount of lime added by 31%, and control the amount of dolomite added by 23%, in order to make the operation of the blowing process stable and obtain the ideal end point temper...

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Abstract

The invention discloses a method for converter steelmaking by directly using bottom slag produced by a converter. Slag in the converter is poured thoroughly after steel tapping of the converter, the bottom slag produced by the converter plays functions of final slag remaining in the original slag-remaining method, and replaces the original end point slag, and solid slag replaces liquid slag; because the content of FeO in the bottom slag is small and the FeO in the bottom slag is solid, thermodynamics conditions required for unbalanced carbon oxygen reaction are difficult to meet, and a large amount of CO gas cannot be generated instantly; the bottom slag is weighed and then added in the converter, and splash accidents and potential safety hazards which are generated when molten iron is fed into the converter in the original slag-remaining method are avoided thoroughly; and problems that by the original slag-remaining method, a converter mouth can be easily reduced frequently, and follow-up molten iron and scrap steel adding is difficult are solved, the quality of the added bottom slag can be controlled precisely, and the operating level and the smelting level of converter steelmaking are improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for directly using the bottom slag produced in a converter for steelmaking in the converter. Background technique [0002] The consumption of iron and steel materials and the consumption of slagging materials are two important production indicators of converter steelmaking. They are not only related to the cost of steelmaking, but also reflect the technology, operation and management level of a steelmaking plant. [0003] In recent years, in order to reduce the consumption of iron and steel materials and lime in converter steelmaking, the slag retention method is mostly used. The main purpose of implementing this type of method is to recover the unfinished molten steel from the previous furnace and use the remaining high-temperature, highly oxidizing, and highly alkaline slag to promote the melting of lime in the early stage of the next furnace smelting...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21B3/04
CPCY02W30/50
Inventor 贾崇雪王念欣刘晓美梁栋王峰王小璞刘效森韩永镇汤晓辉鲁荣杰李长新
Owner SHANDONG IRON & STEEL CO LTD
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