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Method for improving liquidity of high titanium slag in blast furnace smelting vanadium titano-magnetite

A kind of technology of vanadium titanomagnetite and blast furnace smelting

Active Publication Date: 2013-09-04
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem that the slag of high-titanium vanadium-titanium-magnetite blast furnace smelting becomes sticky under the condition of large coal injection, which is not conducive to the separation of slag and iron, and the problem that the traditional method cannot fundamentally solve the problem that the sticky slag brings problems to the operation of the blast furnace. The purpose of this invention is to provide a practical metallurgical method that can not only ensure the sintering quality of vanadium-titanium magnetite, but also improve the viscosity of slag

Method used

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Embodiment 1

[0019] The embodiment of the present invention is obtained by carrying out industrial experiments on a sintering plant and a blast furnace of a certain iron and steel plant. Make TFe>50%, B 2 o 3 Ferro-boron concentrate with a content of 3.8wt% is mixed with 6wt% high-titanium vanadium-titanium magnetite concentrate, ordinary rich ore powder, flux, fuel, and externally distributed ore, etc., so that the B in the sinter 2 o 3 The content of the sintered ore is 0.23wt%, and then the sintered ore is mixed with 32wt% pellets, 7wt% lump ore and coke from the top of the furnace at a ratio of 63wt%; mixed with pulverized coal at 15kg / tHM from the tuyere Spray solid boric acid to make the total B of sinter and injection into slag 2 o 3 The quality accounts for 1.3% of the total slag. Compared with no addition of borides, the drum strength of sintered ore increased by 1.62%, the low-temperature reduction pulverization rate (-3.15mm) decreased by 3.97%, the viscosity of high titani...

Embodiment 2

[0021] The embodiment of the present invention is obtained by carrying out industrial experiments on a sintering plant and a blast furnace of a certain iron and steel plant. Make TFe>50%, B 2 o 3 Ferro-boron concentrate with a content of 6.5wt% is mixed with 2.5wt% high-titanium vanadium-titanium magnetite concentrate, ordinary rich ore powder, flux, fuel, and externally distributed ore, etc., so that the B in the sinter 2 o 3 The content of the sintered ore is 0.16wt%, and then the sintered ore is mixed with 35wt% pellets, 5wt% lump ore and coke from the top of the furnace at a ratio of 60wt%; mixed with pulverized coal at 12.8kg / tHM from the tuyere Mix and inject solid boric acid to make sinter and inject total B in slag 2 o 3 The quality accounts for 1.08% of the total slag. Compared with no addition of borides, the drum strength of sintered ore increased by 1.14%, the low-temperature reduction pulverization rate (-3.15mm) decreased by 3.01%, the viscosity of high tita...

Embodiment 3

[0023] The embodiment of the present invention is obtained by carrying out industrial experiments on a sintering plant and a blast furnace of a certain iron and steel plant. Make TFe>50%, B 2 o 3 Ferro-boron concentrate with a content of 2.5wt%, which is mixed with high-titanium vanadium-titanium magnetite concentrate, ordinary rich ore powder, flux, fuel, and external return ore at 2.4wt%, so that the B in the sinter 2 o 3 The content of the sintered ore is 0.06wt%, and then the sintered ore is mixed with 30wt% pellets, 3wt% lump ore and coke from the top of the furnace at a ratio of 65wt%; mixed with pulverized coal at 9kg / tHM from the tuyere Spray solid boric acid to make the total B of sinter and injection into slag 2 o 3 The quality accounts for 0.8% of the total slag. Compared with no addition of borides, the drum strength of sintered ore increased by 0.64%, the low-temperature reduction pulverization rate (-3.15mm) decreased by 2.14%, the viscosity of high titanium...

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Abstract

The invention relates to a method for improving liquidity of high titanium slag in blast furnace smelting vanadium titano-magnetite. The method comprises the following steps: preparing boron iron concentrate into vanadium titanium sintered ore, adding the sintered ore into a blast furnace together with other furnace burdens; injecting solid boric acid and pulverized coal into the furnace, so that the contents of the sintered ore and B2O3 entering the slag in a blowing mode account for 0.8-1.3 weight percent of the total slag amount. According to the method, the quality of the high titanium vanadium titano-magnetite is improved, the liquidity of high titanium slag is effectively improved, and the slag and iron are favorably separated; and moreover, the method is simple in process and favorable for industrial application since the coal burning process, the coal blowing process and equipment do not need to be improved.

Description

[0001] technical field [0002] The invention belongs to the technical field of metallurgy, relates to the category of blast furnace ironmaking, in particular to a method for improving the fluidity of high-titanium slag in blast furnace smelting vanadium-titanium magnetite. [0003] Background technique [0004] TiO in slag during blast furnace smelting vanadium-titanium magnetite 2 The mass fraction of slag reaches 20-25%. During the smelting process, slag viscosity, slag-iron separation, hearth accumulation and other phenomena will occur, which is more difficult than ordinary ore blast furnace smelting. At the same time, in order to reduce coke consumption and save ironmaking costs, the coal ratio of Panzhihua Iron and Steel's blast furnace has been increased to 130kg / tHM, and on this basis, it is hoped to further increase the coal ratio. Under the condition of large coal injection in Panzhihua Iron and Steel Blast Furnace, a large amount of unburned coal powder will be ...

Claims

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Application Information

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IPC IPC(8): C21B5/04
Inventor 张建良任山邢相栋苏步新刘征建朱广跃王喆王广伟王振阳
Owner UNIV OF SCI & TECH BEIJING
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