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Blast furnace furnace-front molten iron titanium removing method

A technology for removing titanium and molten iron, which is applied in the field of ironmaking, can solve the problems of reducing cleanliness, low titanium content, and reducing the electromagnetic properties of finished products, and achieves the effect of strong site adaptability and high efficiency of titanium removal

Inactive Publication Date: 2018-08-10
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding titanium to protect the furnace will inevitably lead to an increase in the titanium content in the molten iron. Ti in iron has a strong affinity with elements such as C, O, and N, and it is easy to combine with each other to form fine inclusions TiO 2 , TiN and TiC, etc. These small inclusions will significantly reduce the cleanliness of the steel, inhibit the grain growth during the annealing process, reduce the favorable texture during the annealing process, and then reduce the electromagnetic properties of the finished product, especially when producing silicon steel products. Iron loss of silicon steel coil will increase
Therefore, the addition of titanium to protect the furnace leads to an increase in the titanium content in the molten iron and the subsequent process of producing silicon steel products requires a low titanium content in the molten iron is contradictory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, the original titanium content in the molten iron is not high (0.072%), and no titanium is added to protect the furnace; the method for removing titanium from the molten iron in front of the blast furnace in the embodiment of the present invention includes:

[0025] Prepare the detitanium agent according to the mass percentage of 1% of the ton of iron, take the first iron sample to check the composition from the replacement of the torpedo tank, and then start spraying the detitanium agent, spray it into the sampling port of the iron trench according to the flow rate of 1kg / s, and spray about After blowing for 35 minutes, the torpedo tank is connected with a can of molten iron about 210t, transported to the desulfurization station, the slag is removed, and the second iron sample is taken.

[0026] The above-mentioned detitanium removal agent composition weight percent comprises: Fe 2 o 3 75%, S 0.04%, water content 0.3%, CaO 11.66%, SiO 2 7%, MgO 3%,...

Embodiment 2

[0033] In this embodiment, the content of primary titanium in the molten iron is high (0.134%), and titanium is added to protect the furnace; the method for removing titanium from the molten iron in front of the blast furnace in the embodiment of the present invention includes:

[0034] Prepare the detitanium removal agent at 2% of the ton of iron by mass percentage, take the first iron sample to inspect the composition from the replacement of the torpedo tank, and then start spraying the detitanium agent, spray it into the sampling port of the iron trench according to the flow rate of 3kg / s, and spray about After blowing for 15 minutes, the torpedo tank received a can of molten iron about 210t, transported to the desulfurization station, slag was removed, and the second iron sample was taken.

[0035] The above-mentioned detitanium removal agent composition weight percent comprises: Fe 2 o 3 80%, S 0.02%, water content 0.2%, CaO 10%, SiO 2 5%, MgO 2.78%, Al 2 o 3 2%.

[...

Embodiment 3

[0041] In this embodiment, the original titanium content in the molten iron is high (0.115%), and no titanium is added to protect the furnace; the method for removing titanium from the molten iron in front of the blast furnace in the embodiment of the present invention includes:

[0042] Prepare detitanium removal agent at 2% of ton of iron by mass percentage, take the first iron sample to check the composition from the change of torpedo tank, then start to spray the detitanium agent, spray it into the iron ditch sampling port according to the flow rate of 2kg / s, about spray After blowing for 20 minutes, the torpedo tank is connected with a tank of molten iron about 210t, transported to the desulfurization station, slag is removed, and the second iron sample is taken.

[0043] The above-mentioned detitanium removal agent composition weight percent comprises: Fe 2 o 3 85%, S is 0.01%, water content is 0.1%, CaO6%, SiO 2 4.89%, MgO 2%, Al 2 o 3 2%.

[0044] The particle siz...

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Abstract

The invention provides a blast furnace furnace-front molten iron titanium removing method comprising the steps that titanium remover is added into the molten iron of an iron tap channel of a blast furnace, then the molten iron falls to arrive into a torpedo ladle to be stirred, and titanium removing reaction is conducted on the molten iron; and the matching-in speed of the titanium remover is 1-3kg / s. Through the blast furnace furnace-front molten iron titanium removing method, the existing production mode and procedures are changed, the titanium remover can be evenly added into the iron tapchannel of the blast furnace, after added, the titanium remover provides kinetic reaction through molten iron flowing and falling, thus the titanium remover and the molten iron are fully mixed, reaction can be fully conducted, titanium removing efficiency is high, and field adaptability is high.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and in particular relates to a method for removing titanium from hot metal in front of a blast furnace. Background technique [0002] Hearth maintenance is very important in the middle and later stages of blast furnace smelting. Generally, titanium is added to protect the hearth to prevent the temperature difference of the hearth water (thermocouple temperature) from rising and ensure the safe production of the blast furnace. In recent years, with the pursuit of high blast furnace smelting intensity, hearth erosion has become serious. Some newly opened blast furnaces have begun to increase the temperature difference of hearth water (thermocouple temperature) after 2 or 3 years of production, and are forced to add titanium. Protect the furnace and maintain the safe production of the hearth. However, adding titanium to protect the furnace will inevitably lead to an increase in the titanium cont...

Claims

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Application Information

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IPC IPC(8): C21C1/04C21C7/04
CPCC21C1/04C21C7/04
Inventor 张雪松张殿伟周继良张勇梁海龙刘文运
Owner SHOUGANG CORPORATION
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