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Method of converter steelmaking through limestone

A converter steelmaking and limestone technology, which is applied in the manufacture of converters and the improvement of process efficiency, can solve the problems of difficult slag melting, less ore addition, serious slag back-drying, etc., shortening the smelting time and reducing the amount of converter slag Effect

Active Publication Date: 2019-01-04
BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for applying limestone steelmaking to converters, aiming to solve the problem of serious slag dry-out in existing limestone steelmaking methods, which increases the probability of oxygen lance sticking to cold steel and water leakage, and the amount of limestone and dolomite added Too much, resulting in a small amount of ore added, resulting in difficulty in slagging and affecting the technical problems of dephosphorization efficiency

Method used

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  • Method of converter steelmaking through limestone

Examples

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Effect test

Embodiment 1

[0034] In a converter with a nominal capacity of 350 tons, the amount of limestone accounts for 64.6% of the total lime amount, the metal material is 91.7% of molten iron, and 9.3% of scrap steel. The amount of 26.71kg / ton of steel is added, and the limestone is added all at once after the oxygen lance is successfully ignited. The position of the lance in the early stage of blowing is adjusted within a certain range according to the smelting situation. The position of the oxygen lance H=(47~50)d 喉 The oxygen supply intensity of the oxygen lance is 2.85Nm3 / (t.min), and the intensity of the bottom blowing gas supply is 0.06Nm3 / (t.min). After 6 minutes of oxygen blowing, the position of the lance is adjusted within a certain range according to the smelting situation. Oxygen lance position H=(45~46)d 喉 The oxygen supply intensity of the oxygen lance is 2.58Nm3 / (t.min), the gas supply intensity of the bottom blowing is 0.045Nm3 / (t.min), and after 11 minutes of oxygen blowing, the p...

Embodiment 2

[0036] In a converter with a nominal capacity of 350 tons, the amount of limestone accounts for 22.2% of the total lime amount, the metal material is 86.5% of molten iron, and 13.5% of scrap steel. The amount of 11.3kg / ton of steel is added, and the limestone is added all at once after the oxygen lance is successfully ignited. The position of the lance in the early stage of blowing is adjusted within a certain range according to the smelting situation. The position of the oxygen lance H=(48~50)d 喉 Change within the range, the oxygen supply intensity of the oxygen lance is 2.89Nm3 / (t.min), the gas supply intensity of the bottom blowing is 0.05Nm3 / (t.min), after 6.5min of oxygen blowing, the position of the lance is adjusted within a certain range according to the smelting situation , oxygen lance position H=(46~48)d 喉 Change within the range, the oxygen supply intensity of the oxygen lance is 2.4Nm3 / (t.min), the gas supply intensity of the bottom blowing is 0.042Nm3 / (t.min), af...

Embodiment 3

[0038] In a converter with a nominal capacity of 350 tons, the amount of limestone accounts for 100% of the total amount of lime, the metal material is 92.1% of molten iron, 7.9% of scrap steel, the temperature of the molten iron into the furnace is 1445°C, and the silicon content of the molten iron into the furnace is 0.48%. The amount of 38kg / ton steel is added, and the limestone is added in three times. The amount of limestone added for the first time accounts for 57.1% of the total limestone. After oxygen blowing for 2 minutes, the limestone is added for the second time. Limestone accounts for 21.5% of the total amount of limestone, and oxygen is blown for 1.5 minutes Finally, put in the remaining limestone, and adjust the lance position in the early stage of blowing within a certain range according to the smelting situation. The oxygen lance position H=(49~50)d 喉 Change within the range, the oxygen supply intensity of the oxygen lance is 2.76Nm3 / (t.min), the intensity of t...

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Abstract

The invention discloses a method of converter steelmaking through limestone. According to the method disclosed by the invention, loaded metal materials comprise 80%-100% in percentage by mass of molten iron, and the balance of steel scraps or pig iron; in the course of converter steelmaking, limestone is directly added for slag formation steelmaking, after an oxygen lance is ignited, the limestoneis added in 1-3 times, the adding quantity of each batch of the limestone is 2-25 kg per ton of steel, the first batch of the limestone and other slag formation materials are added at the same time,and the adding quantity of the limestone is 10%-100% of total limestone; the second batch of the limestone is added in the early stage of smelting, the adding quantity of the limestone is 10%-90% of the residual limestone, the rest limestone is added before blowing oxygen achieves 50%, and the adding quantity of the limestone is calculated according to CaO, which is 10%-100% of the total adding quantity of the limestone of the converter; the limestone unit consumption per ton of steel is controlled to be 2-38 kg; the position of the oxygen lance is controlled in a high-low-high lance positioncontrol manner, and the lance oxygen supplying strength adopts a strong-weak-strong oxygen supplying manner; the bottom blowing oxygen supplying strength adopts a strong-weak-strong oxygen supplying manner.

Description

technical field [0001] The invention belongs to the technical field of steelmaking production, and in particular relates to a method for making steel using limestone in a converter. Background technique [0002] Converter steelmaking completes the basic tasks of decarburization, carbon oxygen, inclusion removal, harmful gas removal, desulfurization, and dephosphorization by means of strong oxygen supply, slagging, and stirring. The auxiliary materials for slagging are mainly lime, lightly burned, magnesium Ball, magnesite, dolomite, etc. The main function of lime in auxiliary materials is to provide CaO molecules, and CaO can be oxidized with phosphorus in molten steel. 2 O 5 reaction, producing 4CaO·P 2 O 5 with 3CaO·P 2 O 5 , to achieve the purpose of molten steel dephosphorization. Traditional converter steelmaking mainly uses lime for slagging and dephosphorization to achieve the purpose of steelmaking dephosphorization. At present, most steel plants use lime slagg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C5/32
CPCC21C5/32C21C5/36Y02P10/20
Inventor 吴政龙川江汪宁潘永飞靳随城兰天
Owner BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
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