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Improved multi-phase dephosphorizing agent for high-phosphorus molten iron and application of improved multi-phase dephosphorizing agent

A phase dephosphorization agent and an improved technology, applied in the field of iron and steel metallurgy, can solve the problems of environmental problems, slow dephosphorization and slagging, pollution, etc., and achieve the effects of facilitating recycling, improving dephosphorization effect, and reducing production costs.

Active Publication Date: 2017-01-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, in order to build a resource-saving society, some patents have reported dephosphorization agents using waste from other fields as raw materials. A kind of magnesium slag, barium carbonate, converter sludge, iron oxide scale, fluorite, B 2 o 3 Prepared dephosphorization agent; the disadvantage of this dephosphorization agent is that it contains fluorite, which will cause pollution, and environmental problems still exist
The patent "a dephosphorization agent and its application" with application number 201410534612.9 discloses a heterogeneous dephosphorization agent that does not contain fluorine, but the dephosphorization agent of this invention still has insufficient phosphorus oxidation ability and will be used in subsequent applications. It was found that its dephosphorization and slagging speed was slow and its flow effect was insufficient, which made it difficult for this dephosphorization agent to meet the increasingly stringent industrial process

Method used

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  • Improved multi-phase dephosphorizing agent for high-phosphorus molten iron and application of improved multi-phase dephosphorizing agent
  • Improved multi-phase dephosphorizing agent for high-phosphorus molten iron and application of improved multi-phase dephosphorizing agent
  • Improved multi-phase dephosphorizing agent for high-phosphorus molten iron and application of improved multi-phase dephosphorizing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Each component of the heterogeneous dephosphorization agent is calculated as Fe by mass percentage 2 o 3 51%, CaO 22%, Al 2 o 3 3%, SiO 2 16%, Na 2 O 5%, BaO 3%.

[0040] Dephosphorization process of heterogeneous dephosphorization agent:

[0041] 1) Put 400g of prepared pig iron into the induction furnace to melt into molten iron (the composition of molten iron is [P]=0.723wt.%, [Si]=0.105wt.%, [C]=4.05wt.%);

[0042] 2) By adjusting the power of the induction furnace, control the dephosphorization temperature to 1370°C, add 35g of the prepared dephosphorization agent into the molten iron, and stir evenly with a steel rod;

[0043] 3) Dephosphorization ends after 25 minutes.

[0044] After the dephosphorization, the molten iron sample was taken for elemental analysis and detection. After the dephosphorization treatment, the molten iron contained 0.050wt.% phosphorus, and the dephosphorization rate was 91.3%.

[0045] The heterogeneous dephosphorization final ...

Embodiment 2

[0047] Each component of the heterogeneous dephosphorization agent is calculated as Fe by mass percentage 2 o 3 51%, CaO 20%, Al 2 o 3 4%, SiO 2 17%, Na 2 O 6%, BaO 2%.

[0048] Dephosphorization process of heterogeneous dephosphorization agent:

[0049] 1) Put 400g of prepared pig iron into the induction furnace to melt into molten iron (the composition of molten iron is [P]=0.453wt.%, [Si]=0.10wt.%, [C]=4.05wt.%);

[0050] 2) By adjusting the power of the induction furnace, control the dephosphorization temperature to 1370°C, add 35g of the prepared dephosphorization agent into the molten iron, and stir evenly with a steel rod;

[0051] 3) Dephosphorization ends after 25 minutes.

[0052] After the dephosphorization, the molten iron sample was taken for elemental analysis and detection. After the dephosphorization treatment, the molten iron contained 0.033wt.% phosphorus, and the dephosphorization rate was 92.8%.

Embodiment 3

[0054] Each component of the heterogeneous dephosphorization agent is calculated as Fe by mass percentage 2 o 3 55%, CaO16%, Al 2 o 3 4%, SiO 2 17%, Na 2 O 5%, BaO 2%.

[0055] Dephosphorization process of heterogeneous dephosphorization agent:

[0056] 1) Put 400g of prepared pig iron into the induction furnace to melt into molten iron (the composition of molten iron is [P]=0.993wt.%, [Si]=0.10wt.%, [C]=4.05wt.%);

[0057] 2) By adjusting the power of the induction furnace, control the dephosphorization temperature to 1410°C, add 35g of the prepared dephosphorization agent into the molten iron, and stir evenly with a steel rod;

[0058] 3) Dephosphorization ends after 25 minutes.

[0059] After dephosphorization, the molten iron sample was taken for elemental analysis and detection. After dephosphorization, the molten iron contained 0.058wt.% phosphorus, and the dephosphorization rate was 94.1%.

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Abstract

The invention relates to an improved multi-phase dephosphorizing agent for high-phosphorus molten iron and application of the improved multi-phase dephosphorizing agent and belongs to the technical field of iron and steel metallurgy. The multi-phase dephosphorizing agent developed by the invention comprises the following components in percentage by mass: 35% to 60% of FeOt (iron oxide), 20% to 35% of CaO, 2% to 10% of Al2O3, 15% to 25% of SiO2, 3% to 12% of Na2O and 1% to 6% of BaO. After the multi-phase dephosphorizing agent for the molten iron is fused, a multi-phase slag system in which a solid phase and a liquid phase coexist can be formed at a temperature of 1320 DEG C to 1410 DEG C, so the multi-phase dephosphorizing agent is low in energy consumption and is also unexpectedly improved in dephosphorization effect and dephosphorization velocity on the present basis. According to the improved multi-phase dephosphorizing agent designed by the invention is reasonable in components, high in resource recovery rate and convenient for large-scale application.

Description

technical field [0001] The invention relates to an improved multiphase dephosphorization agent for high-phosphorus molten iron and an application thereof, belonging to the technical field of iron and steel metallurgy. Background technique [0002] The presence of phosphorus will affect the structure of the steel, resulting in deterioration of the performance of the steel. In order to improve the service performance and life of steel, it is necessary to reduce the content of phosphorus in steel. For phosphorus, because its harm to steel is difficult to eliminate through heat treatment in the subsequent rolling process, in order to reduce the influence of phosphorus on the properties of steel, it is necessary to reduce the phosphorus content in steel, and for different Specific requirements for phosphorus content are put forward for steel grades. For different quality steel grades, the requirements for phosphorus content are also different. For high-quality carbon structura...

Claims

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Application Information

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IPC IPC(8): C21C7/064C21C1/02
CPCC21C1/025C21C7/0645
Inventor 王万林周乐君吕培生龙旭凯张磊
Owner CENT SOUTH UNIV
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