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Method for controlling alkalinity of dephosphorized slag in double-slag-method converter steelmaking process

A converter steelmaking and control method technology, which is applied to the improvement of process efficiency, manufacturing converters, lime production, etc., can solve the problems of short time and difficulty in accurately controlling the basicity of dephosphorization final slag, so as to improve the slag conversion rate, The effect of improving control accuracy

Pending Publication Date: 2021-02-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] In the early dephosphorization stage of the double slag method converter steelmaking process, due to the low temperature, the temperature at the end of the general dephosphorization stage is about 1380 ° C, and the time of the dephosphorization stage is relatively short, generally 4-7 minutes, resulting in dephosphorization. Phosphorus final slag alkalinity is difficult to control accurately

Method used

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  • Method for controlling alkalinity of dephosphorized slag in double-slag-method converter steelmaking process
  • Method for controlling alkalinity of dephosphorized slag in double-slag-method converter steelmaking process
  • Method for controlling alkalinity of dephosphorized slag in double-slag-method converter steelmaking process

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Embodiment 1

[0033] In this embodiment, a method for controlling the basicity of the dephosphorization slag in the double slag method converter steelmaking process is to spread lime on the bottom of the furnace before adding molten iron to the converter; content, the amount of slag left in the previous furnace, the addition of lightly burned dolomite, iron oxide auxiliary materials and slag steel, and the CaO and SiO 2 Lime and light-burned dolomite slag rate, as well as the target alkalinity to determine; thus control the basicity of the end point of dephosphorization slag, thereby improving the dephosphorization rate of the dephosphorization stage and the slag dumping rate of dephosphorization slag, including The following steps:

[0034] (1) After tapping at the end of the previous furnace, as shown in Table 4, add 5.73 kg / ton of light-burned dolomite as a curing agent, and then perform slag splashing to protect the furnace and solidify the decarburized slag, and then remove the decarbu...

Embodiment 2

[0045] This embodiment is basically the same as Embodiment 1, and the special features are:

[0046] In this embodiment, a method for controlling the basicity of the dephosphorization slag in the double slag method converter steelmaking process is to spread lime on the bottom of the furnace before adding molten iron to the converter. , the amount of slag left in the previous furnace, the amount of lightly burned dolomite, iron oxide auxiliary materials and slag steel, and the CaO and SiO 2 content, lime and light-burned dolomite slag rate, and the target alkalinity to determine the basicity of the end point of the dephosphorization slag, thereby increasing the dephosphorization rate of the dephosphorization stage and the slag dumping rate of the dephosphorization slag, including The following steps:

[0047] (1) After tapping at the end of the previous furnace, as shown in Table 4, add 5.55 kg / ton of light-burned dolomite as a curing agent, and then perform slag splashing to ...

Embodiment 3

[0080] This embodiment is basically the same as the previous embodiment, and the special features are:

[0081] In this embodiment, a method for controlling the basicity of the dephosphorization slag in the double-slag method converter steelmaking process is to spread lime on the bottom of the furnace before adding molten iron to the converter. content, the amount of slag left in the previous furnace, the addition of lightly burned dolomite, iron oxide auxiliary materials and slag steel, and the CaO and SiO 2 content, the slag rate of lime and light-burned dolomite, and the target alkalinity are determined, thereby controlling the alkalinity at the end of the dephosphorization slag. In this embodiment, at least one of sintered ore, returned ore, and OG briquettes is used as an auxiliary material for iron oxide, instead of using sintered ore as an auxiliary material for iron oxide in Example 1, thereby improving the dephosphorization rate in the dephosphorization stage and the ...

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Abstract

The invention discloses a method for controlling alkalinity of dephosphorized slag of a double-slag-method converter steelmaking process. The method comprises the following steps of: before adding molten iron, paving lime at the bottom of a converter according to the silicon content of the molten iron and waste steel, and determining the slag remaining amount of the previous converter, the addingamount of light-burned dolomite, iron oxide auxiliary materials and slag steel, the content of CaO and SiO2, the slagging rate of the lime and the light-burned dolomite, and the target alkalinity. Industrial test results show that the rate of the lime and the light-burned dolomite added in the method is 30-80%. Therefore, the deviation between the predicted alkalinity and the actually-measured alkalinity of the dephosphorized final slag is less than + / -0.2, and the accurate control of the alkalinity of the dephosphorized final slag is realized. The alkalinity of end slag in the dephosphorization period is controlled to be 1.3-2.4, the dephosphorization rate and the deslagging rate in the dephosphorization period can be increased at the same time, and the purposes of reducing lime consumption and increasing the overall dephosphorization rate of steelmaking through the double-slag-method converter steelmaking process are easily achieved.

Description

technical field [0001] The invention relates to the technical field of converter steelmaking process, in particular to a method for controlling the alkalinity of dephosphorization slag in the double slag method converter steelmaking process. The method can improve the accuracy of the terminal alkalinity control of the dephosphorization slag, thereby increasing the dephosphorization rate and the slag dumping rate of the dephosphorization slag in the dephosphorization stage, and achieving the purpose of reducing lime consumption and increasing the overall dephosphorization rate of steelmaking. Background technique [0002] The double-slag method converter steelmaking process is to perform desiliconization and dephosphorization operations in the converter first, and then perform deslagging on the dephosphorization slag; Splash slag to protect the furnace, shake the furnace to confirm that the liquid slag is solidified, then add molten iron, and proceed to the next furnace smelt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C5/32C21C7/064
CPCC21C5/36C21C5/32C21C7/064Y02P10/20Y02P40/40
Inventor 杨健孙晗张润灏叶格凡杨文魁
Owner SHANGHAI UNIV
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