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Dephosphorizing agent and application thereof

A dephosphorization agent and a form of technology, applied in the field of dephosphorization agents, can solve the problems of affecting the hardenability of steel and containing fluorite, and achieve the effects of increasing activity, reducing the amount of slag, and being environmentally friendly

Active Publication Date: 2015-01-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this dephosphorization agent is that it contains fluorite, which will cause pollution, and environmental problems still exist
Although this dephosphorization agent does not contain fluorine, and B 2 o 3 The fluxing effect is obvious, not only does not pollute the environment, but also the dephosphorization slag after dephosphorization contains a relatively high content of phosphorus and boron elements. After treatment, it is an ideal boron-phosphorus compound chemical fertilizer, which will not pollute soil and water resources. It can realize the comprehensive utilization of high added value, but the use of a large amount of boron will make the boron element remain in the molten iron, which will significantly affect the hardenability of the steel

Method used

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  • Dephosphorizing agent and application thereof
  • Dephosphorizing agent and application thereof
  • Dephosphorizing agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Dephosphorizer components (percentage is mass percentage):

[0055] Fe 2 O 3 :33, CaO: 38, SiO 2 :20, Na 2 O:3, Al 2 O 3 :6

[0056] The dephosphorization experiment was carried out in a high-temperature resistance furnace. The weight of the carbon-saturated molten iron sample was 300g, the composition of the molten iron [P] = 0.518%, [Si] ≤ 0.10wt% 0.1wt%; the controlled dephosphorization temperature was 1350℃, at this temperature Next, 30 g of the prepared dephosphorization agent was added to the molten iron in the upper part, and stirred with a molybdenum rod. After 30 minutes of dephosphorization, the molten iron [P] dropped to 0.076%, and the dephosphorization rate was 85.34%.

[0057] The dephosphorization final slag of Example 1 was subjected to water quenching treatment. After drying and grinding, XRD powder diffraction analysis was performed. The analysis results showed that there were only two phases in the dephosphorization final slag, one of which contained sodium...

Embodiment 2

[0061] Dephosphorizer components (percentage is mass percentage):

[0062] Fe 2 O 3 : 25, CaO: 45, SiO 2 :17, Na 2 O:10, Al 2 O 3 :3

[0063] The dephosphorization experiment was carried out in a high-temperature resistance furnace. The weight of the carbon-saturated molten iron sample was 300g, the molten iron content [P]=0.765%, [Si]≤0.10wt%; the dephosphorization temperature was controlled to 1350℃, and the above method of input would be 30 g of the dephosphorization agent prepared above was added to the molten iron and stirred with a molybdenum rod. After 30 minutes of dephosphorization, the molten iron [P] dropped to 0.113%, and the dephosphorization rate was 85.25%.

Embodiment 3

[0065] Dephosphorizer components (percentage is mass percentage):

[0066] Fe 2 O 3 :28, CaO: 32, SiO 2 :30, Na 2 O:3, Al 2 O 3 :7

[0067] The dephosphorization experiment was carried out in a high-temperature resistance furnace. The weight of the carbon-saturated molten iron sample was 300g, the molten iron content [P] = 0.518%, [Si] ≤ 0.10wt%; the dephosphorization temperature was controlled at 1400 ℃, and the above method of input would be 30 g of the dephosphorization agent prepared above was added to the molten iron and stirred with a molybdenum rod. After 30 minutes of dephosphorization, the molten iron [P] dropped to 0.084%, and the dephosphorization rate was 83.72%.

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Abstract

The invention relates to a dephosphorizing agent and application thereof, belonging to the technical field of ferrous metallurgy. The dephosphorizing agent solves the problems of low dephosphorizing efficiency, high residue consumption, environment pollution and difficulty in resource comprehensive utilization in the existing calcium-oxide-based molten iron pretreatment dephosphorizing agent. The dephosphorizing agent comprises the following components in percentage by mass: 25-50% of FeOt, 20-45% of CaO, 15-30% of SiO2, 2-10% of Na2O and 3-12% of Al2O3. After being molten, the molten iron dephosphorizing can form a solid-phase / liquid-phase coexistent multiphase residue system at 1300-1400 DEG C, wherein the solid phase is a 2CaO.SiO2 phase capable of providing a place for enriching oxidized phosphorus in molten iron, so that the dephosphorizing agent has the characteristics of favorable dephosphorizing effect, low slag consumption, no fluorine and small environmental pollution and is beneficial to comprehensive utilization of dephosphorizing slag.

Description

Technical field [0001] The invention relates to a dephosphorization agent and its application; it belongs to the technical field of iron and steel metallurgy. Background technique [0002] Phosphorus is prone to segregation in steel, especially in low temperature conditions, which is prone to "cold brittleness", which affects the anisotropy of steel, thereby reducing the mechanical properties and welding performance of steel. Because phosphorus can neither be removed in the reducing atmosphere of the blast furnace, nor can its harm be eliminated by heat treatment in the subsequent process, it can only be removed during the steelmaking process. [0003] With the increasingly fierce competition among iron and steel enterprises, the application ratio of low-priced high-phosphorus iron ore in the blast furnace production process has gradually increased, which will undoubtedly increase the phosphorus content in the molten iron. At the same time, with the development of society, users h...

Claims

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Application Information

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IPC IPC(8): C21C1/02C21C7/064
Inventor 王万林周乐君谢森林江斌斌刘永珍徐龙云
Owner CENT SOUTH UNIV
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