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A method for controlling the reduction rate of iron ore in a converter

A technology of iron ore and converter, which is applied in the field of controlling the reduction rate of iron ore in the converter, which can solve the problems of splashing, smoking, failure to reduce the consumption of steel materials, etc., and achieve the effect of reducing melting time and preventing splashing

Active Publication Date: 2019-05-07
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this application, the content of iron ore in the slag material is only 15%-17%, and it is clearly stated that the iron ore has a high oxygen content, which leads to active carbon and oxygen reactions, which is likely to cause slag overflow in the early stage of smelting. The amount of iron ore added Too much can also cause splashing and smoking
And the application failed to reduce the consumption of steel materials in the steelmaking process

Method used

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  • A method for controlling the reduction rate of iron ore in a converter

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Comparison scheme
Effect test

Embodiment 1

[0028] A method for controlling the reduction rate of iron ore in the converter in this embodiment is to add molten iron with a temperature of 1320°C in a 120t converter, and after the lance is lowered and ignited and blown, add 50% of the total slagging material with a particle size of 5.0 to 20.0 mm (equivalent diameter) of iron ore, take slag sample 1 after blowing for 1 minute, return to the furnace body and continue blowing, and add iron with a mass of 300kg and a particle size of 20.0 to 50.0mm after blowing for 7 minutes For ore, after blowing for 30s, take the slag sample 2.

[0029] The whole process of blowing is smooth without splashing. Through the detection results of slag sample 1 and the conversion of the pre-feeding, the reduction rate of iron ore added in the early stage is 44%, and the detection results of slag sample 2 and the conversion of mid-term feeding, the reduction rate of iron ore added in the mid-term is 63%. .

Embodiment 2

[0031] A method for controlling the reduction rate of iron ore in the converter in this embodiment is to add molten iron with a temperature of 1300°C in a 120t converter, and after the lance is lowered and ignited and blown, add 60% of the total slagging material with a particle size of 5.0 to 20.0 mm (equivalent diameter) of iron ore, after blowing for 1 minute, turn the furnace back to take slag sample 3, return to the furnace body and continue blowing, and add 200kg of iron with a particle size of 20.0 to 50.0mm after blowing for 7 minutes For ore, after blowing for 30s, take the slag sample by turning back the furnace 4.

[0032] The whole process of blowing is smooth without splashing. Through the test results of slag sample 3 and the conversion of the early feeding, it is concluded that the reduction rate of iron ore added in the early stage is 37%. The detection results of slag sample 4 and the conversion of mid-term feeding show that the reduction rate of iron ore adde...

Embodiment 3

[0034] A method for controlling the reduction rate of iron ore in the converter in this embodiment is to add molten iron with a temperature of 1450°C in a 120t converter, and after the lance is lowered and ignited and blown, add 70% of the total slagging material with a particle size of 5.0 to 20.0 mm (equivalent diameter) of iron ore, take the slag sample 5 after blowing for 1 minute, return to the furnace body and continue blowing, and add iron with a mass of 100 kg and a particle size of 20.0 to 50.0 mm after blowing for 8 minutes For ore, take the slag sample after blowing for 30 seconds.

[0035] The whole process of blowing is smooth without splashing. Through the detection results of slag sample 5 and the conversion of the early feeding, the reduction rate of iron ore added in the early stage is 42%, and the detection results of slag sample 6 and the conversion of mid-term feeding show that the reduction rate of iron ore added in the mid-term is 65%. .

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Abstract

The invention discloses a method for controlling the reduction rate of iron ore in a converter, and belongs to the technical field of ferrous metallurgy. In the method, according to the different molten pool temperatures during the converter smelting period, the reduction rate of the iron ore during complete melting can be effectively controlled by controlling the adding quantity of the added ironore and the particle size of the iron ore. The method specifically comprises the steps that in the converter smelting initial period, the molten pool temperature ranges from 1,300 DEG C to 1,450 DEGC, and the practical size equivalent diameter of the added iron ore ranges from 5.0 mm to 20.0 mm; and in the converter smelting middle and later periods, the molten pool temperature ranges from 1,450DEG C to 1,600 DEG C, and the practical size equivalent diameter of the added iron ore ranges from 20.0 mm to 50.0 mm. According to the method, on one hand, in the converter smelting initial period,the quantity of (FeO) in slag can be fast increased in the iron ore melting process, and fast slag forming of lime in the earlier period can be ensured; and on the other hand, in the converter smelting middle and later periods, the cooling effect of a small quantity of iron ore is not remarkable in the melting process, the situation that a large amount of (FeO) in the slag is instantly accumulatedcannot be prone to happening, and splashing is avoided.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for controlling the reduction rate of iron ore in a converter. Background technique [0002] When iron ore is used in the converter, in addition to its strong cooling effect, it has other advantages: (1) Iron oxide in iron ore undergoes a reduction reaction with Si, C, etc. in molten iron to reduce Fe; (2) The iron oxide in the ore can promote the dissolution of lime, which is beneficial to slagging and accelerates dephosphorization. According to the different needs of the converter blowing period, adjust the use process parameters of iron ore in the converter, so as to ensure that the different needs of promoting lime melting, slagging and increasing metal yield can be obtained under different blowing periods. [0003] The melting and reduction of iron ore in the converter involves a series of complex mass transfer, heat transfer and chemical reaction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/28C21C5/30
Inventor 邓爱军范鼎东陶素芬蒲雪峰沈乾坤
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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