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Process for smelting vanadium titano-magnetite in blast furnace

A technology for vanadium titanomagnetite and blast furnace smelting, applied in the field of iron ore smelting, can solve problems such as resource waste and air pollution, and achieve the effects of increasing heat sources, realizing low carbon emissions and having a wide range of applications

Active Publication Date: 2021-07-23
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the serious problems of air pollution and waste of resources existing in the prior art, and adopts the following three aspects of technical management ideas: one is 'treating diseases with waste', using CO 2 Exhaust gas replaces the nitrogen of traditional air hot air, combined with nitrogen-free, oxygen-rich, and carbon-rich new hot air for blast furnace smelting of vanadium-titanium magnetite, eliminating the formation of titanium carbonitride from the source, completely eradicating the series of problems caused by it, and improving The blast furnace smelting efficiency can realize the blast furnace smelting of all-vanadium-titanium ore, and make its technical and economic indicators reach the level of ordinary iron ore blast furnace smelting; the second is to reduce the CO emitted by metallurgical enterprises 2 Waste gas recycling can greatly reduce carbon emissions in metallurgical processes, and improve the quality of blast furnace gas and its utilization efficiency as fuel in metallurgical enterprises; the third is to realize the smelting process of vanadium-titanium magnetite blast furnace, and the titanium in the slag is "synchronously" synthesized Utilization, high-vanadium molten iron with low silicon and titanium yields higher-grade high-quality vanadium slag

Method used

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  • Process for smelting vanadium titano-magnetite in blast furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1). The hot air stove heats the air, and the output hot air composition: O 2 (g) is 21% (volume), CO 2 (g) 79%, temperature 1000°C, pressure 3Kg; flow rate is 1600m 3 / t.Fe, coal powder carrying capacity 150Kg / t.Fe;

[0039] (2). Hot air and pulverized coal are introduced into the tuyere of the blast furnace, in which oxygen O 2 (g) Participate in the charcoal combustion reaction as an oxidant, and the high temperature generated by the release of heat strengthens the endothermic reaction of charcoal gasification and promotes CO 2 (g) converted to double CO (g) to indirectly reduce iron oxide. On the whole, the coupling between the three reactions and the connection between the oxidizing agent and the reducing agent are smooth , speed up the process of chemical reactions;

[0040] (3). The blast furnace gas discharged from the top of the furnace, the content of CO (g) in the gas after dust removal is 30%, the temperature is 200°C, the pressure is 1Kg, and the rest ...

Embodiment 2

[0043] (1). Use CO instead of hot blast stove 2 (g) Exhaust gas replacement N 2 gas, from CO 2 (g) with O 2 Gas is combined to form a new type of hot air that is nitrogen-free, oxygen-rich, and carbon-rich; the hot air component is CO 2 (g) Content 55%, O 2 (g) The content is 45%, the temperature is 1000℃, the pressure is 3Kg, and the flow rate is 1600m 3 / t.Fe, coal powder carrying capacity 160Kg / t.Fe;

[0044] (2). Hot air and pulverized coal are introduced into the tuyeres of the blast furnace, and O in the hot air 2 (g) Combustion reaction with charcoal, the high temperature generated by the release of heat promotes CO 2 (g) The carbon gasification endothermic reaction occurs, which is converted into CO (g) to indirectly reduce iron oxide. The coupling effect between the three reactions accelerates the reduction reaction process, and the entire reduction smelting cycle can be shortened by more than 20%;

[0045] (3). Blast furnace gas rich in CO (g) is discharged fr...

Embodiment 3

[0048] ⑴Using CO in the hot blast stove 2 (g) Exhaust gas replaces N in the air 2 gas, from CO 2 (g) Exhaust gas and O 2Gas is combined to form a new type of hot air that is nitrogen-free, oxygen-rich, and carbon-rich; the hot air component is CO 2 (g) Content 65%, O 2 (g) content 35%, temperature 1100°C, pressure 2Kg, flow rate 1650m 3 / t.Fe pulverized coal carrying capacity 170 Kg / t.Fe;

[0049] ⑵The hot air and pulverized coal are introduced into the tuyeres of the blast furnace, and the O in the hot air 2 (g) Combustion with charcoal releases heat, and the resulting high temperature promotes CO 2 (g) The endothermic reaction of carbon gasification occurs, which is converted into CO (g) to indirectly reduce iron oxide. The coupling effect between the three reactions speeds up the reduction reaction process, and the entire reduction smelting can be shortened by more than 25%;

[0050] (3) Blast furnace gas rich in CO (g) is emitted from the top of the furnace, the con...

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Abstract

The invention relates to a process for smelting vanadium titano-magnetite in a blast furnace. The novel process is technologically characterized in that nitrogen-free, oxygen-enriched and carbon-enriched novel blast furnace hot air is formed by combining industrial waste gas CO2 and oxygen through transformation of blast furnace hot air "atmosphere" without changing blast furnace system equipment configuration and vanadium titano-magnetite conventional smelting burden proportion, conventional hot air is replaced, a series of operation problems caused by generation of titanium carbonitride due to nitrogen in the hot air are eradicated from the source, and the green advanced novel process, which is short in smelting period, smooth in blast furnace operation, high in schreyerite proportion, high in ferrovanadium yield, and capable of realizing resource utilization of titanium elements, obtaining efficient energy by-products and recycling furnace gas, is provided for schreyerite smelting in the blast furnace.

Description

technical field [0001] The invention relates to the field of iron ore smelting, in particular to a process for smelting vanadium-titanium magnetite in a blast furnace. Background technique [0002] Vanadium-titanium-magnetite is a compound ore in which iron, vanadium, titanium, chromium and other valuable elements coexist, and has extremely high comprehensive utilization value. In the early 1970s, my country successfully developed a series of processes for smelting vanadium-titanium magnetite in blast furnaces. [0003] CN103468844A discloses a method for smelting vanadium-titanium magnetite in a blast furnace. The method includes the following steps: a. controlling the batch weight of each batch of ore to be 50 tons to 55 tons, so as to increase the thickness of the ore and coke layer, and reduce The degree of mixing of ore and coke; b. The coke load is 4.45t / t~4.70t / t when the material is placed for the first time, and a part of the coke is extracted from the total amount...

Claims

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Application Information

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IPC IPC(8): C21B5/00C21B5/04
CPCC21B5/001C21B5/04C21B2005/005
Inventor 隋智通陈东輝娄太平王明华
Owner NORTHEASTERN UNIV
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