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A method for pretreatment and desulfurization of molten iron in converter

A molten iron pretreatment, converter technology, applied in the direction of manufacturing converters, reducing gas emissions, etc., can solve the problems of metal loss, splashing, etc., to achieve the effect of reducing iron loss, improving utilization rate, and good dynamic conditions

Active Publication Date: 2021-07-09
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above three desulfurization processes all carry out pretreatment and desulfurization of molten iron in ladles or iron tanks, which are limited by factors such as the volume and headroom of the ladle and molten iron tanks. During the injection and stirring of molten iron, there are iron and slag splashes Metal loss caused by iron ladles and iron cans

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Desulfurization of molten iron pretreatment in 30-ton converter

[0021] This embodiment is used for pretreatment and desulfurization of molten iron in a 30-ton converter. Two double-layer casing type bottom-blowing powder spray guns are arranged on the bottom of the converter, and nitrogen is used as a carrier gas to spray passivated lime powder and passivated magnesium particles. Air supply flow rate is 1500Nm 3 / h, the powder supply flow rate is 50kg / min; the annular gap is injected with methane for cooling protection, and the air supply flow rate is 120Nm 3 / h.

[0022] The molten iron temperature was measured and sampled. The temperature of the molten iron was 1352°C, and the initial sulfur content of the molten iron was 0.79%. After the converter was mixed with molten iron, the furnace was shaken to zero. Mg particles are sprayed into the molten iron, within 1 minute after the injection starts, passivated lime powder is sprayed, the powder supply flow rate is 50...

Embodiment 2

[0024] Desulfurization of molten iron pretreatment in 120-ton converter

[0025] This embodiment is used for pretreatment and desulfurization of molten iron in a 120-ton converter. The converter bottom is equipped with 4 double-layer casing type bottom-blowing powder spray guns, and nitrogen is used as a carrier gas to spray passivated lime powder and passivated magnesium particles. Air supply flow rate is 2000Nm 3 / h, the powder supply flow rate is 100kg / min; the annular gap is sprayed with methane for cooling protection, and the air supply flow rate is 200Nm 3 / h.

[0026] The molten iron temperature was measured and sampled. The temperature of the molten iron was 1366°C, and the initial sulfur content of the molten iron was 0.79%. Mg particles are sprayed into the molten iron, within 1.5 minutes after the start of injection, passivated lime powder is sprayed, the powder supply flow rate is 80kg / min, and then passivated lime powder and passivated magnesium particles are mi...

Embodiment 3

[0028] Desulfurization of molten iron pretreatment in 350-ton converter

[0029] This embodiment is used for pretreatment and desulfurization of molten iron in a 120-ton converter. The converter bottom is equipped with 4 double-layer casing type bottom-blowing powder spray guns, and nitrogen is used as a carrier gas to spray passivated lime powder and passivated magnesium particles. Air supply flow rate is 2400Nm 3 / h, the powder supply flow rate is 50-160kg / min; the annular gap is sprayed with methane for cooling protection, and the air supply flow rate is 240Nm 3 / h.

[0030] The molten iron temperature was measured and sampled. The temperature of the molten iron was 1366°C, and the initial sulfur content of the molten iron was 0.79%. Mg particles are sprayed into the molten iron, within 1.5 minutes after the start of injection, passivated lime powder is sprayed, the powder supply flow rate is 160kg / min, and then mixed and sprayed with passivated lime powder and passivated...

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Abstract

The invention belongs to the technical field of metallurgical technology, and specifically discloses a method for pretreatment and desulfurization of molten iron in a converter. After the converter is mixed with molten iron, nitrogen is used as a carrier gas to pass passivated lime powder and magnesium particles through a double-layer sleeve. The bottom blowing lance of the tubular converter is sprayed into the molten iron in the converter furnace to realize the desulfurization of the molten iron pretreatment, and the protective gas for the ring seam is methane. Slag, scrap steel is added after slag removal, the converter is shaken to zero position and the gun is lowered for blowing; the bottom blowing gas flow is large, the molten iron is stirred well, there is no stirring dead zone, and the dynamic conditions of molten iron desulfurization are good, and it has both KR mechanical stirring desulfurization and desulfurization. The advantages of compound injection desulfurization can greatly improve the desulfurization efficiency of molten iron and the utilization rate of desulfurization agent. The loss is greatly reduced, thereby reducing the cost of hot metal desulfurization.

Description

technical field [0001] The invention belongs to the technical field of metallurgical technology, and in particular relates to a method for pretreatment and desulfurization of molten iron in a converter. Background technique [0002] Sulfur is a harmful impurity in steel, which endangers the quality of steel and can easily cause hot brittleness of steel. Excessive sulfur mass fraction in steel will also affect its plasticity, toughness and formability. Therefore, in the production of most steel products, harmful impurities such as sulfur and phosphorus should be removed as much as possible, and hot metal desulfurization has become an indispensable key process for modern iron and steel enterprises. [0003] There are three main desulfurization processes for molten iron: single spraying, multiple spraying, and KR desulfurization. [0004] The desulfurization of granular magnesium and composite desulfurizers both belong to the injection desulfurization method, and the carrier g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/34C21C7/064
CPCC21C5/34C21C7/0037C21C7/064Y02P10/143
Inventor 阮强朱青德魏国立张英嘉王德勇茹作栋朱荣胡绍岩李伟峰韩志国
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD