Converter steelmaking technology

A converter steelmaking and converter smelting technology, applied in the manufacture of converters, lime production, etc., can solve the problems of high TFe content, high smelting cost, and high CaO content

Inactive Publication Date: 2012-03-21
SHOUGANG CORPORATION
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Problems solved by technology

[0002] The main smelting process in the converter steelmaking period is to pour the decarburized slag after blowing. For the decarburized slag, the TFe content in the slag is between 18% and 23%, and the CaO content is above 45%. The main feature of this process is that the final slag of the converter is The content of TFe in the medium is high, and the content of CaO in the slag is high, so the smelting cost is high
[0003] At present, there is no relevant converter technology in China that only pours dephosphorization slag but not carbon slag

Method used

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  • Converter steelmaking technology

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Embodiment Construction

[0016] The smelting takes a 100-ton converter as an example. The smelting method is 5 consecutive furnaces. The blowing process is divided into a dephosphorization period and a decarburization period. About 65% of the total blowing time, slag dumping at the end of the dephosphorization period, the amount of slag dumping is shown in the table below, and no slag dumping at the end of the decarburization period. The amount of lime added gradually decreases with the increase of smelting cycle furnaces.

[0017] The smelting data are shown in the table below:

[0018]

[0019] As shown in the above table, the amount of lime added gradually decreases with the increase of continuous smelting heats, the phosphorus content at the end of the converter gradually decreases with the increase of circulating heats, and the slag is dumped at the end of the dephosphorization period, and the amount of slag dumped accounts for 1% of the total slag mass. / 3~1 / 2, no slag dumping at the end of ...

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Abstract

The invention discloses a converter steelmaking technology, and belongs to the technical field of converter steelmaking. In smelting, the technology is mainly characterized in that: the blowing process is divided into two processes, namely the front period of blowing is a dephosphorization period, and the later period of blowing is a decarburization period. Different from a conventional smelting technology, the technology is mainly characterized in that: slag is poured when the dephosphorization period is finished, and slag is not poured when the decarburization period is finished. According to the poured dephosphorization slag, the quantity of the poured dephosphorization slag is more than 30 percent, and the TFe content of the slag is less than 14 percent. Therefore, the technology brings the biggest benefits of saving lime, reducing the consumption of steel and iron and remarkably reducing the phosphorus content together with the increment of the number of smelting furnaces after the decarburization period is finished. The technology has the other characteristic that the smelting period is not increased and is basically as same as the conventional technology.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and particularly provides a converter steelmaking process. In the converter smelting process, only the dephosphorization slag is poured out, but the decarburization slag is not poured out. Background technique [0002] The main smelting process in the converter steelmaking period is to pour the decarburized slag after blowing. For the decarburized slag, the TFe content in the slag is between 18% and 23%, and the CaO content is above 45%. The main feature of this process is that the final slag of the converter is The content of TFe in the medium is high, and the content of CaO in the slag is high, so the smelting cost is high. [0003] At present, there is no related process in which the converter only pours out the dephosphorization slag but not the carbon slag in China. Contents of the invention [0004] The object of the present invention is to provide a converter steelmaking ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/30
CPCY02P40/40
Inventor 王新华邱世中吕延春李永东许晓东王文军刘洋柴玉国姜中行朱志远张翔秦登平王星孙硕猛郝宁王海宝
Owner SHOUGANG CORPORATION
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