Furnace protecting method of iron-smelting blast furnace

A technology for ironmaking blast furnaces and blast furnaces, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as thickening of furnace materials, affecting the viscosity of slag, reducing the gas permeability of blast furnaces, etc., and achieves good results in application prospects

Inactive Publication Date: 2012-05-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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AI Technical Summary

Problems solved by technology

Adding titanium-containing materials from the blast furnace raw material sinter will seriously affect the quality and strength of the sinter; the two kinds of titanium-containing materials are directly added from the top of the furnace, and the titanium-containing materials will be reduced when they fall above the blast furnace tuyere level in the furnace. TiCN, a substance with a high melting point, directly affects the viscosity of the slag and thickens the charge, thereby reducing the gas permeability in the blast furnace and affecting the intensified smelting of the blast furnace

Method used

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Embodiment Construction

[0014] The invention provides a furnace protection method for an ironmaking blast furnace. The specific technical proposal is: spray titanium-containing materials into the blast furnace from a tuyere.

[0015] Preferably, the addition amount of the titanium-containing material is: based on one ton of iron produced, 2kg≤the addition amount of the titanium-containing material≤40kg; if the addition amount is too low, it will not have a protective effect on the bottom of the furnace, and if the addition amount is too high , After exceeding 40kg, it is easy to cause sticky slag, which is not conducive to the intensified smelting of blast furnace.

[0016] Preferably, the titanium-containing material is at least one of ilmenite concentrate, titanium concentrate or high-titanium slag.

[0017] More preferably, TiO in the titanium-containing material 2 Content ≥ 45%. TiO in titanium-containing materials 2 High content, less slag during blast furnace smelting.

[0018] Preferably, ...

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Abstract

The invention belongs to the field of blast furnace smelting and particularly relates to a furnace protecting method of an iron-smelting blast furnace. The invention provides a furnace protecting method of an iron-smelting blast furnace. The technical scheme is as follows: a titanium-containing material is jetted into a blast furnace from a tuyere. In the invention, the titanium-containing material is added into the blast furnace, a high-melting-point substance TiCN is generated at the furnace bottom by utilizing a Ti element contained in the titanium-containing material so as to protect the furnace bottom from being eroded; and in addition, the titanium-containing material is added from the tuyere other than sintering burdening of a furnace top, which dose not influence the quality of sintering ore and eliminates the influences of the titanium-containing material on the air permeability of the blast furnace and intensified smelting of the blast furnace when the titanium-containing material is added from the furnace top.

Description

technical field [0001] The invention belongs to the field of blast furnace smelting, and in particular relates to a furnace protection method for an ironmaking blast furnace. Background technique [0002] With the modern steel industry facing fierce competition, reducing the cost of steel production is more important than ever. The length of life of blast furnace generation in iron and steel enterprises is related to the production status of blast furnace and the economic benefits of the enterprise. With the intensification of blast furnace smelting, the erosion of the blast furnace body has been intensified, and the quality of the hearth and bottom of the blast furnace has become one of the main limiting links that affect the lifetime of the blast furnace. In addition, the carbon bricks at the bottom and hearth of the blast furnace must maintain a certain thickness at the end of the furnace service to ensure the stable operation of the blast furnace; generally, when the sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 蒋胜曾华锋金建均
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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