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A kind of molten steel dephosphorization agent and the method for molten steel dephosphorization

A water dephosphorization agent and dephosphorization technology, applied in the field of molten steel dephosphorization agent, can solve the problem of low dephosphorization rate and achieve the effect of improving dephosphorization rate

Active Publication Date: 2016-08-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defect that the dephosphorization rate is low when the molten steel is dephosphorized by the existing method, and to provide a new molten steel dephosphorization agent and to use the molten steel dephosphorization agent under a specific argon blowing intensity. The method of carrying out dephosphorization of molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment is used to illustrate the molten steel dephosphorization agent and the method for molten steel dephosphorization provided by the present invention.

[0037] In a factory with a 210t converter and a steel tapping capacity of 210t, the measured oxygen activity in molten steel is 900ppm, and the phosphorus content in molten steel is 0.025% by weight. During the tapping process of the converter, add the molten steel dephosphorization agent 7kg / t steel along with the steel flow. The molten steel dephosphorization agent contains lime and sodium carbonate, and the content of lime is 82.5% by weight, and the content of sodium carbonate is 17.5% by weight. Move the molten steel after adding the molten steel dephosphorization agent to the LF furnace for dephosphorization. In the LF process, turn on the electric heating process to control the temperature of the molten steel at 1550°C to melt slag, and the intensity of argon blowing is 100Nm 3 / h·ton of molten stee...

Embodiment 2

[0039] This embodiment is used to illustrate the molten steel dephosphorization agent and the method for molten steel dephosphorization provided by the present invention.

[0040] In a factory with a 210t converter and a steel tapping capacity of 210t, the measured oxygen activity in molten steel is 800ppm, and the phosphorus content in molten steel is 0.020% by weight. During the tapping process of the converter, 8kg / t of molten steel dephosphorization agent is added along with the steel flow. The molten steel dephosphorization agent contains lime and sodium carbonate, and the content of lime is 81% by weight, and the content of sodium carbonate is 19% by weight. Move the molten steel after adding the molten steel dephosphorization agent to the LF furnace for dephosphorization. In the LF process, turn on the electric heating process to control the temperature of the molten steel at 1580°C to melt slag, and the intensity of argon blowing is 120Nm 3 / h·ton of molten steel, the...

Embodiment 3

[0042] This embodiment is used to illustrate the molten steel dephosphorization agent and the method for molten steel dephosphorization provided by the present invention.

[0043] In a factory with a 210t converter and a steel tapping capacity of 210t, the measured oxygen activity in molten steel is 1000ppm, and the phosphorus content in molten steel is 0.022% by weight. During the tapping process of the converter, add molten steel dephosphorization agent 6kg / t steel along with the steel flow. The molten steel dephosphorization agent contains lime and sodium carbonate, and the content of lime is 85% by weight, and the content of sodium carbonate is 15% by weight. Move the molten steel after adding the molten steel dephosphorization agent to the LF furnace for dephosphorization. In the LF process, turn on the electric heating process to control the temperature of the molten steel at 1570°C to melt slag, and the intensity of argon blowing is 80Nm 3 / h·ton of molten steel, the a...

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Abstract

The invention discloses a molten steel dephosphorization agent and a method for dephosphorizing molten steel. The method for dephosphorizing molten steel includes contacting molten molten steel to be dephosphorized with a molten steel dephosphorizing agent during the tapping process of the converter, transferring the contact product to an LF furnace for dephosphorization, and removing slag after the dephosphorization is completed. , wherein, the molten steel dephosphorization agent contains lime and sodium salt; the particle size of the lime is less than 30mm, and at least 80% by weight of the lime has a particle size of 5-20mm; and the argon blowing intensity in the LF furnace is at least 60Nm 3 / h·ton molten steel. Using the molten steel dephosphorization agent provided by the invention to dephosphorize under a specific argon blowing intensity can significantly reduce the phosphorus content in molten steel, improve the dephosphorization rate of molten steel, and has great industrial application prospects.

Description

technical field [0001] The invention relates to a molten steel dephosphorization agent and a method for using the molten steel dephosphorization agent to dephosphorize molten steel. Background technique [0002] Harmful impurities such as phosphorus and sulfur in steel are directly related to the performance of steel, and the presence of phosphorus in steel will reduce the plasticity of steel. When the phosphorus content in the steel is high, the steel is prone to "cold brittleness". In metallurgical production, the plasticity and toughness of the steel will be improved by reducing the phosphorus content in the steel, which can greatly improve the mechanical properties of the steel. . [0003] With the development of the economy, modern society has increasingly higher requirements on the performance of steel materials, which means that the control of impurity content in steel is becoming more and more strict. It is an important task for iron and steel enterprises to strive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 梁新腾曾建华李扬洲龚洪君杨森祥杨晓东喻林陈均何为陈路
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP