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Desulfurization and dephosphorization technology for molten iron pretreatment process

A molten iron pretreatment and process technology, applied in the field of iron and steel metallurgy, can solve the problems of deterioration of toughness, anisotropy of pipeline steel, etc., achieve the effects of reducing energy dissipation, reducing slag viscosity, and increasing dephosphorization efficiency

Active Publication Date: 2019-01-22
JINGYE STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, sulfur also causes anisotropy of pipeline steel, deterioration of toughness in transverse direction and thickness direction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A hot metal pretreatment process desulfurization and dephosphorization process is characterized in that it comprises the following steps:

[0022] (1) Transport the desulfurizer to the KR desulfurization process by tank truck, and use high-pressure nitrogen to transport the desulfurizer to the silo; the pressure of high-pressure nitrogen is 0.3-0.35MP, and the purity is above 99.9%; the desulfurizer is composed of CaO 60 by mass percentage %, Al 2 o 3 12%, SiO 2 5%, MgO 11%, CaF 2 3%, soda ash 3%, K 2 O 3%, Na 2 O 3%; the desulfurizer is pre-melted powder with a particle size of 0.8mm; initial S in molten iron≤0.03%, P≤0.05%;

[0023] (2) During desulfurization, the desulfurizer is blown from the silo to the molten iron tank by nitrogen gas, and stirred by the rotation of the agitator, so that the desulfurizer on the molten iron surface is involved in the molten iron for mixed desulfurization; the pressure of nitrogen injection is 0.1 -0.15MPa, the whole desulfu...

Embodiment 2

[0026]A hot metal pretreatment process desulfurization and dephosphorization process is characterized in that it comprises the following steps:

[0027] (1) Transport the desulfurizer to the KR desulfurization process by tank truck, and use high-pressure nitrogen to transport the desulfurizer to the silo; the pressure of high-pressure nitrogen is 0.3-0.35MP, and the purity is above 99.9%; the desulfurizer is composed of CaO 58 in mass percentage ~61%, Al 2 o 3 12~15%, SiO 2 3-6%, MgO 10-12%, CaF 2 2-4%, soda ash 3-6%, K 2 O 3-6%, Na 2 O 3-6%; the desulfurizer is pre-melted powder with a particle size of 0.5-1mm; initial S in molten iron≤0.03%, P≤0.05%;

[0028] (2) During desulfurization, the desulfurizer is blown from the silo to the molten iron tank by nitrogen gas, and stirred by the rotation of the agitator, so that the desulfurizer on the molten iron surface is involved in the molten iron for mixed desulfurization; the pressure of nitrogen injection is 0.1 -0.15MP...

Embodiment 3

[0031] A hot metal pretreatment process desulfurization and dephosphorization process is characterized in that it comprises the following steps:

[0032] (1) Transport the desulfurizer to the KR desulfurization process by tank truck, and use high-pressure nitrogen to transport the desulfurizer to the silo; the pressure of high-pressure nitrogen is 0.3-0.35MP, and the purity is above 99.9%; the desulfurizer is composed of CaO 58 in mass percentage ~61%, Al 2 o 3 12~15%, SiO 2 3-6%, MgO 10-12%, CaF 2 2-4%, soda ash 3-6%, K 2 O 3-6%, Na 2 O 3-6%; the desulfurizer is pre-melted powder with a particle size of 0.5-1mm; initial S in molten iron≤0.03%, P≤0.05%;

[0033] (2) During desulfurization, the desulfurizer is blown from the silo to the molten iron tank by nitrogen gas, and stirred by the rotation of the agitator, so that the desulfurizer on the molten iron surface is involved in the molten iron for mixed desulfurization; the pressure of nitrogen injection is 0.1 -0.15M...

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Abstract

A desulfurization and dephosphorization technology for a molten iron pretreatment process is characterized in that through adjustment of the specific composition of a desulfurizer and a dephosphorization agent and matching of a corresponding production technology, the content of initial S in molten iron is less than or equal to 0.03% and the content of P is less than or equal to 0.05%. The contentof P of final discharged molten iron after desulfurization and dephosphorization is less than or equal to 0.005%, the content of S is less than or equal to 0.003%, the desulfurization rate is more than or equal to 90%, and the dephosphorization rate is more than or equal to 90%. The raw material requirements in the production of high-grade pipeline steel are met.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a desulfurization and dephosphorization process of molten iron pretreatment when preparing high-grade pipeline steel. Background technique [0002] Pipeline steel is the medium and thick plate and coil required for the manufacture of oil and natural gas pipelines or coal and building material slurry pipelines. The oil and gas pipeline is the most convenient and safest way to connect the resource area and the use area. Its rapid construction can not only relieve the pressure of road transportation in my country, but also play an important role in ensuring the safe supply of the oil and gas market. The carbon content of pipeline steel is gradually reduced, the alloy elements are diversified, and harmful elements such as sulfur and phosphorus are also controlled at a very low content. In addition to high strength and high toughness, high-grade pipeline...

Claims

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Application Information

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IPC IPC(8): C21C7/064
CPCC21C7/0037C21C7/064C21C7/0645
Inventor 张觉灵杨海西曹喜军樊利智
Owner JINGYE STEEL CO LTD
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