A method for preventing the foamy splash of converter caused by iron ore

A technology for iron ore and converters, which is applied in the field of preventing iron ore from causing foam splashing in converters. It can solve problems such as failure to reduce consumption of steel materials, active carbon-oxygen reactions, and slag overflow, so as to improve oxygen utilization and accelerate Effects of melting and accelerating consumption

Active Publication Date: 2019-05-31
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 preventing the foamy splash of converter caused by iron ore

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Experimental program
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Effect test

Embodiment 1

[0033] A method for preventing foamy splashing of the converter caused by iron ore in this embodiment is to add molten iron with a temperature of 1300°C in a 120t converter, and after the lance is ignited and blown, the particle size of 50% of the total slagging material weight is added. 5.0 ~ 20.0mm (equivalent diameter) of iron ore. And the added iron ores are three groups of iron ores with different particle sizes, among which M 1 The particle size of group iron ore is 5-8mm, M 2 The particle size of group iron ore is 10-12mm, M 3 The particle size of the group iron ore is 16-28mm. The mass ratio of the three groups of iron ores is M1 group:M2 group:M3 group=5:3:2. The whole process of blowing is smooth without splashing.

Embodiment 2

[0035] A method for preventing foamy splashing of the converter caused by iron ore in this embodiment is to add molten iron with a temperature of 1320°C in a 120t converter, and after the lance is ignited and blown, the particle size of 60% of the total slagging material weight is added. 5.0 ~ 20.0mm (equivalent diameter) of iron ore. And the added iron ores are three groups of iron ores with different particle sizes, among which M 1 The particle size of the group iron ore is 6-10mm, M 2 The particle size of the group iron ore is 12-15mm, M 3 The particle size of the group iron ore is 15-20mm. The mass ratio of the three groups of iron ores is M1 group:M2 group:M3 group=4.5:3.5:2.2. By controlling the timing and amount of adding the slagging material, the reduction rate when the iron ore added into the converter is completely melted is controlled between 30% and 50%. The whole process of blowing is smooth without splashing.

Embodiment 3

[0037] A method for preventing foamy splashing of the converter caused by iron ore in this embodiment is to add molten iron with a temperature of 1350°C in a 120t converter, and after the lance is lowered and ignited and blown, the particle size of 70% of the total slagging material weight is added. 5.0 ~ 20.0mm (equivalent diameter) of iron ore. And the added iron ores are three groups of iron ores with different particle sizes, among which M 1 The particle size of group iron ore is 5-9mm, M 2 The particle size of the group iron ore is 10-13mm, M 3 The particle size of the group iron ore is 17-20mm. The mass ratio of the three groups of iron ores is M1 group:M2 group:M3 group=5.5:2.5:1.5. By controlling the timing and amount of adding the slagging material, the reduction rate when the iron ore added into the converter is completely melted is controlled between 30% and 45%. The whole process of blowing is smooth without splashing.

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Abstract

The invention discloses a method for preventing a convertor from splashing in a foaming mode by iron ore, and belongs to the technical field of ferrous metallurgy. According to the method, when iron ore is added at the early stage of smelting of the convertor, the granularity of the added iron ore and the addition of the iron ore are regulated and controlled, and the influence of the iron ore on the accumulation of FeO is controlled, so that the slag foaming stability and the precipitation rate of gas in a molten pool are controlled, and the convertor is prevented from splashing in the foamingmode. At the early stage of the smelting of the convertor, the temperature of the molten pool is between 1300 DEG C and 1450 DEG C, the proportion of the added iron ore is increased, and the iron oreof different granularities is added, so that the amount of FeO can be quickly increased in a melting process of the iron ore, the melting point and viscosity of slag are reduced, and quick slagging of lime at the early stage is guaranteed, so that the slag foaming maximum time is moved forward, thus, gas can be effectively discharged when the carbon oxygen reaction speed reaches the maximum, andthe splashing in the foaming mode at the early and middle stage can be effectively avoided.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for preventing foamy splashing of a converter caused by iron ore. Background technique [0002] Converter steelmaking can complete the blowing of a furnace of steel in just 20-30 minutes, which is closely related to the formation of foamy slag. In the process of converter steelmaking, the impact of the oxygen stream can break the molten metal and slag, and splash many small droplets. Some of the droplets are wrapped in the furnace gas and move with the furnace gas, and some of them return to the molten pool. Participate in cycling. At the same time, the oxygen stream itself is also crushed, and a large number of small bubbles are formed together with the carbon-oxygen reaction product, so that the gas, slag, and metal form a three-phase emulsion, that is, foam slag. Almost all molten metal in the molten pool will go through the droplet process, and so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36
CPCC21C5/36C21C2005/366C21C2300/02
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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