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Blast furnace vanadium-titanium magnetite smelting method by utilizing ultra-high oxygen enriching air blasting

A technology of vanadium-titanium magnetite and oxygen-enriched blast, which is applied to blast furnaces, blast furnace details, furnaces, etc., can solve problems such as difficulty in strengthening smelting, poor air permeability, and sticky slag, so as to improve high-temperature droplet performance and reduce hazards , the effect of increasing smelting strength

Active Publication Date: 2018-07-27
UNIV OF SCI & TECH BEIJING
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  • Description
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for smelting vanadium-titanium magnetite in a blast furnace utilizing ultra-high oxygen-enriched blast. increase the coal injection ratio, reduce the coke ratio, reduce the gas volume per ton of iron, and improve the gas permeability of the material column, so as to achieve the purpose of reducing energy consumption and strengthening the smelting strength of vanadium-titanium magnetite, and solve the problem of blast furnace smelting vanadium-titanium The problems faced in the process of magnetite are low coal ratio, high energy consumption, viscous slag, poor air permeability and difficulty in strengthening smelting

Method used

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  • Blast furnace vanadium-titanium magnetite smelting method by utilizing ultra-high oxygen enriching air blasting
  • Blast furnace vanadium-titanium magnetite smelting method by utilizing ultra-high oxygen enriching air blasting

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The blast oxygen enrichment rate is 5%: at a certain 2000m 3 80% vanadium-titanium sinter, 15% vanadium-titanium pellets and 10% lump ore are used as raw materials for the blast furnace; coke and ore are fed into the blast furnace by the blast furnace roof distribution equipment; After being heated by the heating furnace, it is blown into the blast furnace; the pulverized coal is blown into the blast furnace through the coal gun through the direct blowing pipe; The remaining part is externally supplied for power generation; the process is as follows figure 1 As shown, its production technical indicators are as follows:

[0031] Oxygen consumption: 51m 3 / tHM;

[0032] Coke ratio: 390kg / tHM;

[0033] Coal ratio: 137kg / tHM;

[0034] Blast humidity: 3.5%;

[0035] Air volume: 1024.1 m 3 / tHM;

[0036] Composition of bosh gas: CO: 40.5%, H 2 : 6.3%, N 2 : 53.2%;

[0037] Bosh gas volume: 1378.7 m 3 / tHM;

[0038] Bosh gas volume index: 62.7;

[0039] Theoretical...

Embodiment 2

[0044] The blowing oxygen enrichment rate is 10%: the implementation steps are the same as the implementation column 1, and its production technical indicators are as follows:

[0045] Oxygen consumption: 88m 3 / tHM;

[0046] Coke ratio: 360kg / tHM;

[0047] Coal ratio: 169kg / tHM;

[0048] Blast humidity: 4.8%;

[0049] Air volume: 880.1 m 3 / tHM;

[0050] Composition of bosh gas: CO: 45.5%, H 2 : 8.4%, N 2 : 46.1%;

[0051] Bosh gas volume: 1258.51 m 3 / tHM;

[0052] Bosh gas volume index: 63.17;

[0053] Theoretical combustion temperature: 2218°C;

[0054] Top gas composition (dry): CO: 26.8%, H 2 : 4.6%, CO 2 : 26.3%, N 2 : 42.2%;

[0055] Furnace top gas volume: 1376.5m 3 / tHM;

[0056] Utilization factor: 2.56t / ( m 3 · d), the utilization factor increased by 30%.

Embodiment 3

[0058] The blast oxygen enrichment rate is 15%: at a certain 1000m 3 80% vanadium-titanium sintered ore, 15% vanadium-titanium pellets and 10% lump ore are used as raw materials for the blast furnace. Coke and ore are fed into the blast furnace by the blast furnace roof distribution equipment; the oxygen enrichment rate is 10%. The cold air pipe in front of the blower is directly mixed into the blast furnace after being heated by the heating furnace, and the remaining 5% oxygen enrichment rate is blown into the blast furnace through the oxygen coal gun equipment; the injection coal powder is injected into the blast furnace through the direct blowing pipe of the oxygen coal gun; The slag and iron are discharged from the blast furnace through the iron gate; part of the furnace top gas is used for combustion and heating in the hot blast stove after drying and dust removal, and the remaining part is used for external power generation; the process is as follows figure 2 As shown, ...

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Abstract

The invention relates to the technical field of vanadium-titanium magnetite smelting, and provides a blast furnace vanadium-titanium magnetite smelting method by utilizing ultra-high oxygen enrichingair blasting. The content of oxygen in hot air of a blast furnace is increased to 26-41% level, the corresponding air blasting oxygen enrichment rate is 5-20%, and the combustion rate of coal powder at the front end of a tuyere is increased; the coal gas reducing potential is increased; the reducing, soft melting, dripping and slag forming process of the vanadium-titanium magnetite in the blast furnace is optimized, breathability of the blast furnace is improved, and it is guaranteed that production of the blast furnace is stably and smoothly performed; and the problems that in the process ofsmelting the vanadium-titanium magnetite through the blast furnace process, the coal ratio is low, the energy consumption is high, furnace slag is viscous and thick, breathability is poor and intensified smelting is difficult are solved. According to the method, it is adopted that high-concentration oxygen is extra added in the hot air of the blast furnace, the oxygen content in the hot air is increased, the coal spraying ratio can be increased, the coke ratio is reduced, the iron making energy consumption of the blast furnace is reduced, the smelting strength is improved, production of the blast furnace is stabilized, and the blast furnace smelting cost of the vanadium-titanium magnetite is reduced.

Description

technical field [0001] The invention relates to the technical field of vanadium-titanium-magnetite smelting, in particular to a method for smelting vanadium-titanium-magnetite using a blast furnace with ultra-high oxygen-enriched blast. Background technique [0002] In the process of smelting vanadium-titanium magnetite in the blast furnace, the increase of the proportion of vanadium-titanium magnetite makes the slag thicken easily when the TiO2 content in the slag increases, the air permeability of the blast furnace becomes poor, the coal ratio is difficult to increase, and the energy consumption remains high , Blast furnace intensified smelting is difficult to achieve. The reason is that the performance of the slag deteriorates and the pressure difference of the blast furnace increases, which is mainly related to the high melting point phase titanium carbonitride produced by the over-reduction of titanium oxide in the slag. Under normal circumstances, adding some common o...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/00C21B5/008
Inventor 张建良王广伟姜曦王海洋
Owner UNIV OF SCI & TECH BEIJING
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