A method for improving the dephosphorization effect of titanium-containing high-phosphorus molten iron converter dephosphorization period

A technology of dephosphorization period and molten iron, applied in the field of steelmaking, can solve the problems of lime easily wrapped by slag, poor separation effect of slag and steel, poor dephosphorization effect, etc. The effect of improving liquidity

Active Publication Date: 2022-05-20
SHOUGANG SHUICHENG IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can solve the problems of over-viscosity of slag during dephosphorization of titanium-containing high-phosphorus molten iron converter, poor separation effect of slag and steel, easy lime to be wrapped by slag and thus low utilization rate and poor dephosphorization effect, and control TiO in slag 2 Effect on lime melting, increase lime slag rate, improve fluidity of dephosphorization slag

Method used

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  • A method for improving the dephosphorization effect of titanium-containing high-phosphorus molten iron converter dephosphorization period
  • A method for improving the dephosphorization effect of titanium-containing high-phosphorus molten iron converter dephosphorization period
  • A method for improving the dephosphorization effect of titanium-containing high-phosphorus molten iron converter dephosphorization period

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Embodiment 1

[0064] A method for improving the dephosphorization effect of titanium-containing high-phosphorus molten iron converters during the dephosphorization period. The "double slag + slag remaining" process is adopted, and the amount of slag remaining is controlled by 1 / 2 of the total slag. Lime and steel scrap are first added to the converter and Stir-frying and preheating, and then the charging mode of molten iron, adopts the slag-making method mainly of active lime, light-burned dolomite and sintered ore. After the top gun oxygen blowing starts, according to the actual chemical composition of molten iron, the Add light-burned dolomite, and then add lime after reacting for a period of time. At the same time, according to the composition and temperature of molten iron, control the appropriate gun position and oxygen supply intensity during the dephosphorization period to control the slag structure during the dephosphorization period; specifically include the following steps:

[0065...

Embodiment 2

[0074] A method for improving the dephosphorization effect of a titanium-containing high-phosphorus molten iron converter during the dephosphorization period, characterized in that it specifically includes the following steps:

[0075] ①When the steel was tapped at the end of the converter smelting in the last furnace, the total slag amount was about 10,000Kg, and the remaining slag amount was controlled to be 1 / 2 of the total slag amount, that is, the remaining slag amount was 5,000Kg; the process route around "retaining slag + double slag" , make full use of and give full play to the high FeO content of the final slag (the FeO content of the final slag of the previous furnace is 17.0%), and promote lime melting;

[0076] ② After the slag-splashing operation of the previous furnace is completed, add 1000Kg of lime directly into the furnace and then add scrap steel, and tilt the converter to preheat it, and pour molten iron into the converter after preheating is completed;

[...

Embodiment 3

[0084] A method for improving the dephosphorization effect of a titanium-containing high-phosphorus molten iron converter during the dephosphorization period, characterized in that it specifically includes the following steps:

[0085] ①When the steel was tapped at the end of the converter smelting in the last furnace, the total slag amount was about 9000Kg, and the amount of slag remaining was controlled to be 1 / 2 of the total slag amount, that is, the amount of slag remaining was 4500Kg; the process route around "retaining slag + double slag" , make full use of and give full play to the high FeO content of the final slag (the FeO content of the final slag of the last furnace is 16.8%), and promote lime melting;

[0086] ② After the slag-splashing operation of the previous furnace is completed, add 1000Kg of lime directly into the furnace and then add scrap steel, and tilt the converter to preheat it, and pour molten iron into the converter after preheating is completed;

[008...

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Abstract

The invention discloses a method for improving the dephosphorization effect of a titanium-containing high-phosphorus molten iron converter during the dephosphorization period, which comprises the following steps: ① when the steel is tapped at the end of the converter smelting in the previous furnace, the slag is poured and the slag is left; ② the slag is left in the previous furnace After the first batch of slag splashing is completed, the first batch of lime and scrap steel are added in sequence, preheated, and molten iron is added; ③ After "ignition", lightly burned dolomite and the second batch of lime are added respectively to maintain high oxygen supply intensity. The oxygen lance position is gradually lowered to the lowest lance position, and sintering is added to return to the ore; ④ When the first batch of slag is melted, slag is generated, and the second batch of slag is added, the lance position is increased and the oxygen supply intensity is reduced, the smelting is terminated, and the furnace is reversed Temperature measurement and sampling. The invention solves the problems that the slag is too sticky in the dephosphorization stage of the titanium-containing high-phosphorus molten iron converter, the slag-steel separation effect is poor, the lime is easily wrapped by the slag, and the utilization rate is low, and the dephosphorization effect is poor, and the early stage slag TiO is controlled. 2 A large amount of generation affects the slag structure and dephosphorization effect, thereby increasing the dephosphorization rate in the dephosphorization period to more than 65%.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for improving the dephosphorization effect of a titanium-containing high-phosphorus molten iron converter during the dephosphorization period. Background technique [0002] The viscosity of molten iron increases with the increase of its titanium content. The reason why titanium increases the viscosity of molten iron is that the atomic radius of titanium is greater than that of iron, which reduces the free space of iron melt. figure 1 is the relationship between temperature and viscosity of molten iron under different titanium contents, given by figure 1 It can be seen that when the temperature is higher than the melting temperature of the molten iron sample (the iron sample made after the molten iron is solidified to detect its melting temperature), the viscosity of the molten iron is less than 4Pa s, and the fluidity of the molten iron is better; when t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/02C21C5/28C21C7/064
CPCC21C1/02C21C5/28C21C7/064Y02P10/20
Inventor 王劼陶昌德华福波伍从应杨昌涛文安义刘明波杨龙飞陈浩
Owner SHOUGANG SHUICHENG IRON & STEEL GRP
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