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Method for producing steel by using limestone in semisteel steelmaking of top-bottom combined blowing converter

A top-bottom re-blowing, limestone technology, applied in the field of metallurgy, can solve the problems of low heat, low carbon content, difficult slagging in converters, etc., and achieve the effects of reducing production costs, promoting the interface between steel and slag, and shortening the slag slag time.

Inactive Publication Date: 2019-07-16
CHENGDE IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with ordinary molten iron, the carbon content in the semi-steel molten iron after vanadium extraction is relatively low, and the silicon and manganese content are all consumed into the vanadium slag during vanadium extraction, and the heat generated in the converter blowing process is relatively low, so It is difficult to realize limestone instead of lime for converter slagging

Method used

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  • Method for producing steel by using limestone in semisteel steelmaking of top-bottom combined blowing converter

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Effect test

Embodiment 1

[0020] In this embodiment, a method of using limestone slag-making steelmaking in the semi-steelmaking of the top-bottom combined blowing converter is as follows:

[0021] After the converter receives the slag splash protection furnace, add semi-steel into the steelmaking converter, the temperature of the semi-steel is 1350 ℃, P: 0.08%, and then add limestone, lime, light-burned dolomite materials for slagging and oxygen blowing, The basicity of the slag is 2.5, and the oxygen supply blowing time is 12 minutes. The oxygen lance is blown at a lower position before and during the middle stage of the oxygen supply blowing, and at a higher position in the later period. During the oxygen supply blowing process of the converter, according to For smelting, 500kg of limestone is added in 3 batches with a particle size of 15mm, and a total of 1500kg of lime is added, that is, limestone:lime=1:3, and the end point of smelting is controlled: C: 0.06%, P: 0.008%, and the end point temperat...

Embodiment 2

[0024] In this embodiment, a method of using limestone slag-making steelmaking in the semi-steelmaking of the top-bottom combined blowing converter is as follows:

[0025] After receiving the slag-splashing protective furnace of the converter, add semi-steel into the steelmaking converter, the temperature of the semi-steel is 1420°C, P: 0.208%, and then add limestone, lime, and light-burned dolomite materials for slagging and oxygen blowing. The basicity of the slag is 3.5, and the oxygen supply blowing time is 10 minutes. The oxygen lance is blown at a lower position before and during the middle stage of the oxygen supply blowing, and at a higher position in the later period. During the oxygen supply blowing process of the converter, according to For smelting, 1000kg of limestone is added in 4 batches, the particle size is 20mm, and 1000kg of lime is added in total, that is, limestone:lime=1:1, and the smelting end point is controlled: C: 0.10%, P: 0.015%, and the end point te...

Embodiment 3

[0028] In this embodiment, a method of using limestone slag-making steelmaking in the semi-steelmaking of the top-bottom combined blowing converter is as follows:

[0029] After the converter receives the slag splash protection furnace, add semi-steel into the steelmaking converter, the temperature of the semi-steel is 1380 ℃, P: 0.103%, and then add limestone, lime, light-burned dolomite materials for slagging and oxygen blowing, The basicity of the slag is 4.0, and the oxygen supply blowing time is 15 minutes. The oxygen lance is blown at a lower position before and during the middle stage of the oxygen supply blowing, and at a higher position in the later period. For smelting, 800kg of limestone is added in 5 batches with a particle size of 30mm, and a total of 1600kg of lime is added, that is, limestone:lime=1:2, and the end point of smelting is controlled: C: 0.08%, P: 0.006%, and the end point temperature is 1665°C. Furnace out of steel.

[0030] By adopting the method ...

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Abstract

The invention discloses a method for producing steel by using limestone in semisteel steelmaking of top-bottom combined blowing converter. The method comprises the following steps that semisteel is added into a converter, limestone, lime and light-burned dolomite materials are added in batches for slagging and oxygen supply blowing, and after a converter smelting control end point is reached, thesteel is discharged. According to the method, the limestone is used for replacing part of the lime to carry out converter steelmaking production, so that the use amount of the lime and the dependenceof converter semisteel steelmaking on lime slagging are reduced, meanwhile, the production cost can be reduced, and the purposes of energy conservation, emission reduction and environmental friendliness are achieved; in the limestone decomposition process, the generated CO2 reacts with CO generated in the C in the steel in the floating escaping process, so that not only can the adsorption upward floating of the impurities be promoted, but also the effect of the steel slag interface is promoted, the slagging time of the converter is shortened by 0.5-2.0min, the dephosphorization efficiency is improved, and the final dephosphorization rate is more than or equal to 90%.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a steelmaking method using limestone to make slag in the semi-steel steelmaking of a top-bottom combined blowing converter. Background technique [0002] As the country adopts energy-saving and emission-reduction policies for iron and steel enterprises, how to meet the smelting requirements of the converter smelting process, which is the core link of the steelmaking industry, can bear low energy consumption and low pollution, and reduce the cost of steelmaking has become a concern of metallurgists. focus and the vitality of the development of iron and steel enterprises. [0003] At present, in the converter smelting process, lime, light-burned dolomite, light-burned magnesium balls, etc. are mainly used as slagging raw materials for slagging, so as to realize the tasks of dephosphorization, desulfurization and removal of inclusions in the converter. Among them, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C7/04C21C7/064
CPCC21C5/36C21C7/04C21C7/064Y02P40/40
Inventor 靳刚强单红超李亚厚李洋车晓锐刘宏春张东翁玉娟
Owner CHENGDE IRON & STEEL GRP
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