Molten iron dephosphorizing agent and application method thereof

A technology of water dephosphorization agent and application method, which is applied in the field of steel production, can solve problems such as increased carbon consumption, achieve high dephosphorization rate, improve dephosphorization kinetic conditions, and avoid the effect of excessive carbon oxidation consumption

Inactive Publication Date: 2011-06-15
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the gas oxygen ratio will lead to increased carbon consumption during the dephosphorization process, and even dephosphorization without decarbonization.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The distribution ratio of each component of the dephosphorization agent is 80% of calcium oxide, 16% of iron oxide, and 4% of calcium fluoride by weight percentage; the initial phosphorus content of the molten iron to be treated is 0.290%, and the carbon content is 4.15%.

[0019] Dephosphorization process:

[0020] 1) Weigh 200kg of prepared pig iron into the induction furnace and start heating to melt the pig iron;

[0021] 2) After the pig iron is melted, measure the temperature and take samples. When the temperature rises to 1350°C, blow oxygen into the molten pool from the oxygen pipe on the top of the furnace, and at the same time add the pre-mixed dephosphorization agent in batches. Add 70% in the first batch. Add the remaining 30% after 5 minutes; the amount of the selected dephosphorization agent is 8% of the weight of the pig iron, that is, 16kg; the weight of the blown oxygen is 2.304kg, which is equivalent to a volume of 1.61m under standard conditions. 3 ....

Embodiment 2

[0026] The components of the dephosphorization agent are 75% calcium oxide, 20% iron oxide, and 5% calcium fluoride by weight percentage; the initial phosphorus content of the molten iron to be treated is 0.340%, and the carbon content is 4.18%.

[0027] Dephosphorization process:

[0028] 1) Weigh 210kg of prepared pig iron into the induction furnace and start heating to melt the pig iron;

[0029] 2) After the pig iron is melted, measure the temperature and take samples. When the temperature rises to 1360°C, blow oxygen into the molten pool from the oxygen pipe on the top of the furnace, and at the same time add the pre-mixed dephosphorization agent in batches. Add 60% in the first batch. Add the remaining 40% after 4 minutes; the amount of the selected dephosphorization agent is 10% of the weight of the pig iron, that is, 21kg; the weight of the oxygen blown in is 1.89kg, which is equivalent to a volume of 1.32m under standard conditions. 3 .

[0030] 3) The dephosphoriza...

Embodiment 3

[0033] The components of the dephosphorization agent are 80% by weight of calcium oxide, 15% of iron oxide and 5% of calcium fluoride; the detected initial phosphorus content of the molten iron to be treated is 0.680%, and the carbon content is 4.03%.

[0034] Dephosphorization process:

[0035] 1) Weigh 190kg of prepared pig iron into the induction furnace and start heating to melt the pig iron;

[0036] 2) After the pig iron is melted, measure the temperature and take samples. When the temperature rises to 1340°C, blow oxygen into the molten pool from the oxygen pipe on the top of the furnace, and at the same time add the pre-mixed dephosphorization agent in batches. Add 80% in the first batch. Add the remaining 20% ​​after 3 minutes; the amount of dephosphorization agent selected is 15% of the weight of pig iron, that is, 28.5kg; the weight of oxygen blown in is 3.848kg, which is equivalent to a volume of 2.69m under standard conditions. 3 .

[0037] 3) The dephosphorizat...

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PUM

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Abstract

The invention discloses a molten iron dephosphorizing agent and an application method thereof. The dephosphorizing agent comprises the following components in percentage by weight: 75 to 85 percent of calcium oxide, 10 to 21 percent of iron oxide and 4 to 5 percent of calcium fluoride. The application method of the molten iron dephosphorizing agent sequentially comprises the following steps of: 1) weighing prepared pig iron, adding into an induction furnace, and starting to heat and melt the pig iron; 2) measuring the temperature and sampling after the pig iron is melted down, blowing oxygen in a molten pool from an oxygen pipe on the top of the furnace when the temperature is raised to 1,350+/-10 DEG C, and adding the premixed dephosphorizing agent in batches simultaneously, wherein 60 to 80 percent of dephosphorizing agent is added first, and the residual dephosphorizing agent is added after 3 to 5 minutes; and 3) continuously heating for 12 to 18 minutes, and finishing dephosphorization. By adjusting a ratio of the dephosphorizing agent to the oxygen, alkalinity and an adding mode, the consumption of the solid dephosphorizing agent is effectively reduced while high dephosphorizing rate is achieved, so that advantages are provided for the pretreatment of high-phosphorus molten iron in a converter.

Description

technical field [0001] The invention belongs to the technical field of steel production, in particular to a molten iron dephosphorization agent and an application method thereof. Background technique [0002] The dephosphorization agent commonly used in molten iron pretreatment mainly includes three major components: oxidant, fixative and flux. The main function of the oxidant is to oxidize phosphorus in iron water, and oxides with poor stability are often used, such as Fe 2 o 3 , FeO, MnO 2 etc., the fixing agent is to firmly combine the oxidized phosphorus in the slag for removal, and the function of the flux is to reduce the melting point of the dephosphorization slag, and metal compounds or fluorides are often used. The invention patent with the current application number 03115576.6 discloses a molten iron dephosphorization agent using converter slag as raw material. Limestone 0~3, soda 0~3 Limestone 0~3, it is cheap to choose waste converter slag as raw material, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C7/064
Inventor 吴杰文志军岑明进肖志新
Owner 武钢集团有限公司
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