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Semi-steel dephosphorization agent and semi-steel dephosphorization method

A technology of steel dephosphorization agent and liquid steel, which is applied in the field of semi-steel dephosphorization, can solve the problems of high pressure in dephosphorization treatment and no effective treatment measures for phosphorus, and achieve the goal of reducing sodium content, lightening dephosphorization tasks, and simple operation Effect

Inactive Publication Date: 2015-09-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] However, for the steelmaking process using vanadium-titanium magnetite for smelting, after the molten iron is desulfurized, the sulfur can be reduced to less than 0.005%, but there is no effective treatment for phosphorus, and the pressure of dephosphorization during converter smelting is high

Method used

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Examples

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Comparison scheme
Effect test

example 1

[0029] Adopt lime, iron oxide scale, sodium oxide as raw material production dephosphorization agent, lime 50wt%, iron oxide scale 25wt%, sodium oxide 25wt%; In the semi-steel tank, the amount of dephosphorization agent added is 20kg / t of semi-steel; the dephosphorization agent is added before the semi-steel is exhausted, and after the semi-steel is exhausted, nitrogen blowing treatment is carried out at the bottom of the semi-steel tank. When nitrogen is used, the semi-steel liquid level fluctuates slightly. After the nitrogen blowing is completed, the semi-steel is subjected to slag removal before entering the steelmaking furnace.

[0030] The phosphorus content in semi-steel is 0.070%, and after dephosphorization, the phosphorus content in semi-steel is 0.026%, and the dephosphorization rate reaches 62.86%.

example 2

[0032] Adopt lime, iron oxide scale, sodium oxide as raw material production dephosphorization agent, lime 35wt%, iron oxide scale 45wt%, sodium oxide 20wt%; In the semi-steel tank, the amount of dephosphorization agent added is between 10kg / t of semi-steel; the dephosphorization agent is added before the semi-steel is exhausted, and the nitrogen blowing treatment is carried out at the bottom of the semi-steel tank after the semi-steel is exhausted, and the nitrogen blowing time is controlled In 5 minutes, the semi-steel liquid level fluctuates slightly when blowing nitrogen. After the nitrogen blowing is over, the semi-steel is subjected to slag removal treatment before entering the steelmaking furnace, and the exposed liquid level of the semi-steel must reach more than 90%.

[0033] The phosphorus content in the semi-steel is 0.061%. After dephosphorization, the phosphorus content in the semi-steel is 0.029%. The temperature of the semi-steel is 1392°C, and the dephosphoriza...

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Abstract

The invention discloses a semi-steel dephosphorizing agent and a semi-steel dephosphorizing method. The dephosphorizing agent disclosed by the invention is prepared by the following substances in parts by weight: 35-50 parts of lime, 25-45 parts of oxide scale and 15-25 parts of sodium oxide. The method disclosed by the invention comprises the following steps of: uniformly adding the semi-steel dephosphorizing agent into discharged molten steel during discharging steel and controlling the adding amount of the semi-steel dephosphorizing agent as 10-20kg / t; blowing nitrogen to the bottom of the molten steel after finishing discharging steel; and carrying out slag pulling treatment after ending the blowing of the nitrogen. The semi-steel dephosphorizing agent and the semi-steel dephosphorizing method disclosed by the invention have the advantages of reducing the dephosphorizing task of a steel smelting converter during smelting the molten steel, creating the conditions for smelting low-phosphorus steel and realizing smelting steel with less slag, effectively removing the phosphorus content in the semi-steel, having a dephosphorizing rate which reaches greater than 40%, being simple to operate, having no requirement of additionally establishing facility equipment, not extending the time of working procedure, reducing the auxiliary material consumption of smelting steel via the converter, effectively avoiding the problem that the converter lining is corroded by a common dephosphorizing and vanadium-extracting agent and simultaneously reducing the content of sodium in the vanadium slag.

Description

technical field [0001] The invention belongs to the technical field of semi-steel dephosphorization, and more specifically relates to a semi-steel dephosphorization agent and a dephosphorization method using the semi-steel dephosphorization agent. Background technique [0002] In general, phosphorus is a harmful element in most steel grades. In recent years, with the rapid development of science and technology, low-temperature steel, marine steel, hydrogen-induced cracking-resistant steel and steel for some thick plates must not only have extremely low sulfur content, but also require the phosphorus content in steel to be less than 0.01% or 0.005%. Since the 1980s, various treatment methods have been developed for the pre-dephosphorization of molten iron. The dephosphorization pretreatment of molten iron is carried out in-house, and both methods have been applied industrially. Dephosphorization of ladles or torpedo tanks mainly has problems such as large temperature drop,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/064
Inventor 陈炼张强陈永戈文荪曾建华王建蒋龙奎卓钧王二军董克平
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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