Method for preparing steel-making pig iron from high-phosphorus oolitic hematite based on high-frequency induction furnace

A technology for high-frequency induction furnaces and steelmaking pig iron, applied in furnaces, electric furnaces, furnace types, etc., can solve the problems of poor welding performance and cold bending performance, plasticity and impact toughness, etc., and achieve high production efficiency and melting efficiency High and low energy consumption

Inactive Publication Date: 2017-03-29
WUHAN UNIV OF SCI & TECH
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Problems solved by technology

However, phosphorus is a harmful element for most steel types. When the phosphorus content in the steel is high, the plasticity and impact toughness of the steel will be reduced, and the welding performance and cold bending performance of the steel will be deteriorated, and the brittleness of the steel will appear.

Method used

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  • Method for preparing steel-making pig iron from high-phosphorus oolitic hematite based on high-frequency induction furnace
  • Method for preparing steel-making pig iron from high-phosphorus oolitic hematite based on high-frequency induction furnace
  • Method for preparing steel-making pig iron from high-phosphorus oolitic hematite based on high-frequency induction furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Material crushing and screening: use high-phosphorus oolitic hematite lump ore as raw material, after crushing and screening, ensure that the particle size of ore powder is less than 1mm.

[0042] (2) Gas-based reduction: take the sieved ore powder as needed and put it into a high-temperature bedroom resistance furnace, and use high-purity H 2 , for 60 minutes of reduction, control the gas flow rate 0.5L / min, the reduction temperature in the resistance furnace is 750°C; the metallization rate of ore powder reaches 88%.

[0043] (3) Alkalinity adjustment: add an appropriate amount of pre-melted CaO-SiO to the reduced ore powder 2 The powdery slag material with a binary basicity of 2 is added in an amount of 8% of the reduced ore powder.

[0044] (4) Additive composition: on the basis of adding slag, add additive CaF 2 and C 2 FeO 4 2H 2 O, the additive is analytically pure CaF 2 powder and analytically pure C 2 FeO 4 2H 2 O powder, the addition amount is res...

Embodiment 2

[0047] (1) Material crushing and screening: take high phosphorus oolitic hematite lump ore as raw material, crush and screen it to obtain high phosphorus rock powder with a particle size of less than 1mm.

[0048] (2) Gas-based reduction: put the sieved ore powder into a high-temperature bedroom resistance furnace, and use the reducing gas H 2 Carry out the reduction for 100 minutes, control the gas flow rate to 1L / min, and the reduction temperature in the resistance furnace is 800°C. The metallization rate of ore powder reaches 90%.

[0049] (3) Alkalinity adjustment: Add a certain proportion of pre-melted CaO-SiO to the reduced ore powder 2 The powdery slag material with a binary basicity of 2.5, the amount of the slag material added is 10% of the reduced mineral powder.

[0050] (4) Additive composition: on the basis of adding slag, add an appropriate amount of analytically pure CaF 2 and C 2 FeO 4 2H 2 O powder, CaF 2 The amount used is 2% of the reduced ore powder,...

Embodiment 3

[0053] (1) Material crushing and screening: take high phosphorus oolitic hematite lump ore as raw material, crush and screen it to obtain high phosphorus rock powder with a particle size of less than 1mm.

[0054] (2) Gas-based reduction: put the sieved ore powder into a high-temperature bedroom resistance furnace, and use the reducing gas H 2 Carry out the reduction for 120min, control the gas flow rate to 2L / min, and the reduction temperature in the resistance furnace is 850°C. The metallization rate of ore powder reaches 94%.

[0055] (3) Alkalinity adjustment: Add a certain proportion of pre-melted CaO-SiO to the reduced ore powder 2 The powdery slag material with a binary alkalinity of 3, the amount of the slag material added is 15% of the reduced ore powder.

[0056] (4) Additive composition: on the basis of adding slag, add an appropriate amount of analytically pure CaF 2 and C 2 FeO 4 2H 2 O powder, CaF 2 The amount used is 3% of the reduced ore powder, C 2 FeO...

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Abstract

The invention relates to a method for preparing steel-making pig iron from high-phosphorus oolitic hematite based on a high-frequency induction furnace and belongs to the field of ferrous metallurgy and resource recycling. The method adopts high-purity H2 to perform gas-based reduction on raw mineral powder, facilitates improving the metallization ratio and the porosity of the mineral powder, and the metallization ratio of the mineral powder subjected to reduction reaches 85% or above. Through adding of favorably pre-molten CaO-SiO2 binary basicity slag charge and a little of powdery additives CaF2 and C2FeO4.2H2O, quick slag-iron deslagging and separation can be realized. The advantages that the high-frequency induction furnace is high in heating speed and melting efficiency are utilized to realize slag-iron separation within a short period of time. Meanwhile, as the induction furnace has a certain electromagnetic mixing effect, slag and iron are in full contact, and the system dephosphorization and desulfuration effects are improved. The steel-making pig iron prepared under the process condition has the phosphorus content of less than 0.3%, the sulfate content of less than 0.02%, the silicone content of less than 0.5% and the iron recovery rate more than 85%.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy and resource recycling, and specifically refers to a method for preparing steelmaking pig iron from high-phosphorus oolitic hematite based on a high-frequency induction furnace, which is used for low-grade and difficult-to-select non-traditional iron ore with high phosphorus Oolitic hematite to prepare pig iron for steelmaking. Background technique [0002] The lack of high-quality iron ore resources in my country, the low utilization rate of complex and refractory iron ore, and the insufficient production capacity of domestic iron ore production enterprises have resulted in a serious shortage of supply in the domestic iron ore market. Therefore, it is of great significance to strengthen the research on the efficient development and utilization of complex and refractory iron ore in my country, and to improve the self-sufficiency rate of iron ore. [0003] As a non-traditional ore resource...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/14C21B13/12
CPCC21B13/14C21B13/0006C21B13/0073C21B13/008C21B13/12
Inventor 李光强王恒辉赵栋马江华曹羽鑫
Owner WUHAN UNIV OF SCI & TECH
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