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Efficient dephosphorization process for converter

A converter and dephosphorization technology, applied to the improvement of process efficiency, manufacturing converters, lime production, etc., can solve the problems of difficult to achieve dephosphorization effect and slow dephosphorization speed, and achieve good dephosphorization effect and dephosphorization efficiency high effect

Active Publication Date: 2013-03-13
SHOUGANG CORPORATION
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Problems solved by technology

However, when the slag at the end of the converter is left in the furnace for dephosphorization, the slag already has about 1.5% P 2 o 5 , compared with the traditional process, due to the P in molten steel and slag 2 o 5 The concentration gradient is different. If the blowing process is the same as the traditional process, the dephosphorization rate is slow, and it is difficult to achieve the same dephosphorization effect as the traditional process.

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  • Efficient dephosphorization process for converter
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Embodiment Construction

[0017] Main technique of the present invention comprises the following contents:

[0018] (1) After the converter is tapped, no slag is dumped, and the slag remains in the brick furnace for dephosphorization in the blowing stage of the next furnace;

[0019] (2) The dephosphorization stage of the converter adopts low lance position operation, and the top blowing oxygen lance position is controlled according to the following formula: H=3.23×h -2 +1.3, where: H is the position of the lance, m; h is the depth of the molten pool, m; in the actual production process, the position of the lance is related to the design parameters of the oxygen lance, the gas pressure of the oxygen lance, and the shape of the converter. The oxygen lance and the eigenvalues ​​of the relevant parameters of the converter, after the regression, the relationship between the lance position and the depth of the molten pool is obtained when the conventional process is used for converter steelmaking: H=3.23×h ...

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Abstract

The invention relates to an efficient dephosphorization process for a converter, and belongs to the technical field of converter steelmaking. In the process, end slag of the converter is not poured out and is used for the next dephosphorization in the converter; in order to improve the smelting effect in the stage of dephosphorization in circulation of the converter, the lance position and the oxygen supply in the stage of dephosphorization and a slagging technological means are controlled to realize the efficient dephosphorization by using the end slag of the converter, so that the lime consumption can be reduced, the dephosphorization effect of the converter is improved, and compared with those of the conventional process, the lime consumption can be saved by 40 to 60 percent, the consumption of caustic calcined dolomite is saved by 40 to 46 percent, and the mass fraction of phosphorous in terminal molten steel of the converter is less than 0.006 percent.

Description

technical field [0001] The invention belongs to the technical field of converter steelmaking, and in particular provides a process for efficient dephosphorization of a converter. Background technique [0002] For the traditional converter steelmaking method, all the slag is poured out after each furnace is smelted and tapped. When the next furnace is smelted, lime and other furnace materials are re-added. This mode of operation consumes a lot of lime and costs a lot. Therefore, using the slag at the end of converter smelting to continue dephosphorization is the best way to solve the large consumption of lime in traditional converter operation. [0003] In traditional converter production, in order to achieve the dephosphorization effect, lime and other slags are added to the converter after blowing starts, and the added slag basically does not contain P 2 o 5 . However, when the slag at the end of the converter is left in the furnace for dephosphorization, the slag alrea...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C7/064
CPCY02P10/20Y02P40/40
Inventor 朱国森李海波王新华王建伟吕迺冰崔阳包春林何肖飞刘国梁吕延春王文军姜仁波南晓东
Owner SHOUGANG CORPORATION
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