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Blowing-in method of blast furnace

A blast furnace and charge technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as difficult to confirm detection, low carbon saturation, etc., achieve stable heat storage, increase carbon saturation, and avoid furnace conditions.

Pending Publication Date: 2022-07-26
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the problems existing in the prior art, the object of the present invention is to provide a method for starting a blast furnace to solve the problems of low carbon saturation and difficulty in confirming detection still existing in the current starting process

Method used

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  • Blowing-in method of blast furnace
  • Blowing-in method of blast furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The present embodiment provides a method for opening a blast furnace, and the method for opening a furnace includes sequentially performing furnace charge smelting, molten iron charge smelting, and stable smelting;

[0074] The blast furnace used in the described furnace is a blast furnace filled with sleepers in the hearth;

[0075] In the smelting of the open-furnace charge, the whole-furnace coke ratio of the open-furnace charge is 3.3 t / t, the amount of the blast furnace entering the furnace is 70% of the maximum air volume of the blast furnace, and the binary basicity of the obtained slag is 0.84;

[0076] The molten iron charge is smelted into a first smelting stage, a second smelting stage and a third smelting stage, with a total of 16 smelting cycles;

[0077] Wherein, the first smelting stage consists of 4 smelting cycles (in the first smelting cycle, the charge to coke ratio is 3.3t / t, and the binary basicity of the slag is controlled to be 0.84); with the inc...

Embodiment 2

[0084] The present embodiment provides a method for opening a blast furnace, and the method for opening a furnace includes sequentially performing furnace charge smelting, molten iron charge smelting, and stable smelting;

[0085] The blast furnace used in the described furnace is a blast furnace filled with sleepers in the hearth;

[0086] In the smelting of the open-furnace charge, the whole-furnace coke ratio of the open-furnace charge is 3.5 / t, the charging component is 60% of the maximum air volume of the blast furnace, and the binary basicity of the obtained slag is 0.83;

[0087] The molten iron charge is smelted into a first smelting stage, a second smelting stage and a third smelting stage, with a total of 16 smelting cycles;

[0088] Wherein, the first smelting stage consists of 4 smelting cycles (in the first smelting cycle, the charge to coke ratio is 3.5t / t, and the binary basicity of the slag is controlled to be 0.83); as the smelting cycle increases, the In the...

Embodiment 3

[0096] The only difference from Example 1 is that stable smelting is not performed. The carburizing saturation of carbon bricks after the furnace is completed is shown in Table 1.

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Abstract

The invention relates to a blow-in method of a blast furnace. The blow-in method comprises the steps of blow-in furnace charge smelting, molten iron furnace charge smelting and stable smelting which are carried out in sequence. In the blow-in furnace charge smelting, the whole furnace coke ratio of the blow-in furnace charge is 3.2 t / t-3. 5t / t, the charging component is less than or equal to 70% of the maximum blast air volume of a blast furnace, and the binary alkalinity of the obtained furnace slag is 0.83-0.85; the molten iron furnace burden smelting at least comprises three smelting stages; along with the increase of the smelting stages, the coke ratio of the furnace charge added in the molten iron furnace charge smelting is gradually reduced, the binary alkalinity of the obtained furnace slag is gradually increased, the silicon content in the molten iron is sequentially reduced, and the sulfur content in the molten iron is sequentially reduced; in the stable smelting, the silicon content of molten iron is 0.6-0.8%, the silicon content is maintained for 3-5 days, and the binary alkalinity of the obtained slag is 1.22-1.25. The carbon saturation of the carbon bricks in the blast furnace is remarkably improved by adopting a specific blow-in process, and a solid foundation is laid for prolonging the service life of the blast furnace.

Description

technical field [0001] The invention relates to the field of steelmaking, in particular to a method for opening a blast furnace. Background technique [0002] At present, the blast furnace generally adopts the process of building carbon bricks in the hearth. Generally, the carbon bricks in the hearth area include multiple layers, which vary according to the thickness of the carbon bricks. Generally, there are 3-5 layers. One of the conditions for opening the furnace. [0003] In the early stage of the new blast furnace, since the hearth is in a cold state, the silicon content of the molten iron is at a high level a few days before the blast furnace is opened. On the other hand, the charge structure in the early stage of the furnace is mainly slag-making (through the formation of high-temperature slag system to increase the overall heat of the hearth, the slag temperature is as high as 1500 ℃ or even higher). Slag making, can form protective slag skin to protect the blast f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCC21B5/008C21B5/007Y02P10/20
Inventor 陈生利向杜全匡洪锋余骏刘立广邓晖陈炯骆昊颜庆生段娟娟陈运东欧阳军李兰林刘凯颜庆丽黄卓东
Owner SGIS SONGSHAN CO LTD
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