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Method for maintenance and fettling of blast furnace by using low titanium pellet

A technology for protecting the furnace and titanium balls of a blast furnace, which is applied to blast furnaces, blast furnace details, furnaces, etc., can solve the problems of complex charge structure, many types of charged charge, and reduced blast furnace production efficiency, achieve good technical and economic indicators, simplify charge structure, The effect of high productivity

Inactive Publication Date: 2005-06-01
SHOUGANG CORPORATION
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Problems solved by technology

Adding titanium-containing charge will reduce the comprehensive grade of the furnace ore, especially the use of titanium ore, titanium slag and high-titanium pellets will greatly reduce the comprehensive grade of the furnace ore, thereby reducing the production efficiency of the blast furnace, and there are many types of furnace materials, so that The charge structure is complex, which is not conducive to production organization

Method used

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Embodiment Construction

[0006] Below in conjunction with No. 1 blast furnace embodiment of Shougang, the present invention is further described:

[0007] Shougang No. 1 Blast Furnace (2536m 3 ) At present, titanium ore is used for furnace protection and repairing, but titanium ore has low Fe content, SiO 2 and Al 2 o 3 A series of shortcomings such as high content and large fluctuations in composition. In order to replace titanium ore, on October 21, 2002, Miyun Iron Mine was organized to directly add New Zealand titanium sand to conduct an industrial test of producing low-titanium pellets. The specific situation is analyzed as follows:

[0008] New Zealand titanium sand TiO 2 Content about 7.8%, Fe content about 57.0%, SiO 2 The content is about 4.07%; the content of Ti and Fe is still good, but the particle size is relatively coarse, which is not suitable for pelletizing. If the method of "grinding first, then pelletizing" is adopted, the grade of Ti and Fe will be further improved, and the ...

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Abstract

The present invention belongs to the field of iron smelting blast furnace protecting technology in metallurgical industry, and is blast furnace protecting and repairing method with low-titanium pellet. The low-titanium pellet is produced in rotary kiln or vertical kiln through adding titania sand into the concentrate powder less than 30 % to result in titania content of 1-4 %. By means of controlling titania content in the low-titanium pellet, the burden has simplified structure and consists of sintered ore 60-80 wt%, low-titanium pellet 0-20 wt% and raw ore 5-20 wt% and relatively high grade over 60 %. While protecting or repairing furnace, the present invention obtain high technological indexes and high production efficiency.

Description

technical field [0001] The invention belongs to the field of ironmaking blast furnace hearth maintenance in the metallurgical industry, and relates to a method for using low-titanium pellets to protect and repair the blast furnace. technical background [0002] The life of a first-generation blast furnace mainly depends on the condition of the hearth. With the intensification of blast furnace smelting, the increase of furnace top pressure and the smelting of reasonable low-silicon ferrosilicon, the importance and urgency of maintaining the hearth have become increasingly prominent. Therefore, from the day when the blast furnace is put into production, the monitoring and maintenance of the hearth should be strengthened. Hearth maintenance is mainly long-term furnace protection and temporary furnace repair. Furnace mending and furnace protection both refer to adding titanium-containing charge to the charge, but the addition amount is different, resulting in unequal titanium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 张卫东钱凯陈汉宇竺维春单洎华
Owner SHOUGANG CORPORATION
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