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Method for converter steelmaking by using small-particle grade high-basicity sintered ore

A converter steelmaking and high alkalinity technology, applied in the field of metallurgy, can solve the problems of high cost of sintering process, low utilization rate of sintering machine, impact on sinter quality, etc. The effect of slag and good furnace lining

Active Publication Date: 2014-03-05
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has problems such as difficulty in ignition, large amount of slag, and low metal recovery rate.
[0005] In the process of blast furnace smelting, sinter with a particle size of less than 5mm is usually returned to the sinter plant as a part of sinter raw materials for sintering again. On the one hand, it is not conducive to the sintering process and the quality of sinter is affected; The utilization rate is not high, not only the energy consumption is increased, the ore formation rate is affected, but also the production capacity is reduced, and the cost of the sintering process is increased
However, the FeO content in small-sized sintered ore is about 9%, and it has the characteristics of uniform particle size, large bulk porosity, high strength, and good stability. How to maximize recycling, improve metal recovery rate, and expand the space for steelmaking cost reduction remains to be seen. solved problem

Method used

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  • Method for converter steelmaking by using small-particle grade high-basicity sintered ore
  • Method for converter steelmaking by using small-particle grade high-basicity sintered ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A 120t top-bottom double-blowing converter is used to blow smelt HRB400E steel. Scrap steel is first added to the converter and then molten iron is added. The total charge is 134t. The temperature of the molten iron is 1290°C. The weight percentage of the elements is C: 4.170%, Si: 0.310 %, Mn: 0.560%, S: 0.018%, P: 0.159%. Then blow oxygen into the furnace from the oxygen lance on the top of the converter (the purity of oxygen is ≥99.5%, the oxygen supply pressure is 0.86MPa, and the oxygen supply flow rate is 27000m 3 / h), nitrogen is blown into the bottom of the converter, and after the ignition is successful, lime, 16% of lightly burned dolomite, 8% of magnesite balls and 16% of the total slag are added from the high-level silo with a particle size of 3mm ~ 4mm, high alkalinity sintered ore with a basicity of 2 (the addition amount is 11kg / t), when blowing for 4 minutes, the flame at the furnace mouth softens and retracts, so it can be judged that the primary slag i...

Embodiment 2

[0040] A 120t top-bottom combined blowing converter is used to blow smelt Q235B steel. Scrap steel is first added to the converter and then molten iron is added. The loading capacity is 132t. The temperature of the molten iron is 1305°C. The weight percentage of the elements is C: 4.250%, Si: 0.470% , Mn: 0.530%, S: 0.024%, P: 0.175%. Then blow oxygen into the furnace from the oxygen lance on the top of the converter (the purity of oxygen is ≥99.5%, the oxygen supply pressure is 0.86MPa, and the oxygen supply flow rate is 27000m 3 / h), argon gas is blown into the bottom of the converter, and after the ignition is successful, lime, 30% lightly burned dolomite and 9% high alkalinity sintered ore (addition amount is 8kg / t), at 4.5 minutes of blowing, the flame at the furnace mouth softened and retracted, thus judging the formation of primary slag, controlled by the position of the gun and the addition of slag, the blowing was stable and normal, and the slag was added at 9′45″ F...

Embodiment 3

[0042] A 120t top-bottom double-blowing converter is used to blow smelt HRB500E steel. Scrap steel is first added to the converter and then molten iron is added. The loading capacity is 135t. The temperature of the molten iron is 1280°C. The weight percentage of the elements is C: 4.330%, Si: 0.420% , Mn: 0.590%, S: 0.018%, P: 0.203%. Then blow oxygen into the furnace from the oxygen lance on the top of the converter (the purity of oxygen is ≥99.5%, the oxygen supply pressure is 0.86MPa, and the oxygen supply flow rate is 27000m 3 / h), nitrogen is blown into the bottom of the converter, and after the ignition is successful, lime, 16% of lightly burned dolomite, 5% of magnesite balls and 11% of the particle size of the total slag are added from the high-level silo. 4mm~ 5mm, high alkalinity sintered ore with a basicity of 2.5 (adding amount: 12kg / t), when blowing for 4.5 minutes, the flame at the furnace mouth softens and retracts, so it can be judged that the primary slag is f...

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Abstract

The invention discloses a method for converter steelmaking by using a small-particle grade high-basicity sintered ore. The method comprises the steps of adding waste steel and molten iron into a converter; blowing gas into the converter, and after the success of blowing ignition, adding lime, light burned dolomite, magnesite balls and a high-basicity sintered ore of which the particle size is 3-5mm and the basicity is 2-3 into the converter sequentially by using an overhead bunker; stopping blowing when end-point components and temperature of molten steel meet requirements; turning down the converter to ensure that the molten steel flows into a ladle, and adding a deoxidizing agent; casting the molten steel. The high-basicity sintered ore has a trend of increasing oxygen, can be used as a latent solvent, can cool a molten pool after being heated and reduced and is tiny and lightweight, so that the sintered ore can float in slag easily, can increase the content of ferric oxide in the slag and improve blowing slag melting conditions, and is favorable for slag melting; the method can improve the recovery rate of metals and reduce the consumption of oxygen, the consumption of steel and iron materials of a steel plant and the production cost. The basicity and the MgO content of a sinter returned ore are higher than those of an iron ore, so that a furnace liner can be better protected, and the furnace age of the converter can be effectively prolonged.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a converter steelmaking method. Background technique [0002] Converter steelmaking uses molten iron, scrap steel, and ferroalloy as the main raw materials, and completes the steelmaking process in the converter by relying on the physical heat of the molten iron itself and the chemical reaction between the components of the molten iron to generate heat. [0003] According to the heat balance calculation, the heat of converter steelmaking is surplus. In order to meet the smelting requirements, the converter usually uses steel scrap as the main coolant in the smelting process, and iron ore is used to fine-tune the converter temperature for cooling. The main component of iron ore is Fe 2 o 3 , Fe 3 o 4 , Iron ore is reduced after melting, and the process absorbs heat, so it can play a role in regulating the temperature of the molten pool, but iron ore hardly contains CaO, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C5/36
Inventor 陆大章金友祥肖东李信平赵建宏陈寿红赵金成速国武
Owner WUKUN STEEL
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