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Blast furnace smelting process used for high-vanadium-titanium low-MgO furnace slag

A technology for blast furnace smelting and blast furnace slag, applied in blast furnaces, blast furnace details, furnaces, etc., can solve the problems of sinter TFe grade decline, production cost increase, solvent usage increase, etc., to improve comprehensive economic benefits and reduce blast furnace production cost, and the effect of reducing the amount of solvent used

Inactive Publication Date: 2015-04-01
SICHUAN CHUANWEI GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the blast furnace slag must have a desulfurization capacity of more than 90% to ensure that the sulfur in the molten iron is qualified. Therefore, the slag has a high alkalinity, generally around 1.25 to 1.35.
MgO in blast furnace slag is generally 9%, which brings about the increase of solvent usage, the decrease of sinter TFe grade, and the increase of production cost before iron
If the content of MgO in the slag is only reduced in blast furnace smelting, it will lead to problems such as poor fluidity of slag, poor desulfurization ability, and unqualified molten iron.

Method used

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  • Blast furnace smelting process used for high-vanadium-titanium low-MgO furnace slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] MgO content 2.4%, Al 2 o 3 The vanadium-titanium sinter with a content of 2.6% is 63%, with 5% acid lump ore and 32% of vanadium-titanium pellets with a MgO content of 2.8%, and an appropriate amount of coke is sent to the blast furnace according to the conventional distribution method. System for smelting:

[0022] I blast furnace heat system

[0023] a molten iron temperature: 1400 ~ 1450 ℃.

[0024] b. The temperature of the slag is controlled between the upper hot ash and the oil fruit.

[0025] c [Si], [Ti] control: 0.33% ≤ [Si] + [Ti] ≤ 0.55%.

[0026] II air supply system

[0027] a Try to achieve full wind operation to maintain high smelting intensity and blast kinetic energy.

[0028] b Full air temperature operation, kept above 1100 ℃.

[0029] c The coal injection ratio is maintained at 100-125kg / tFe.

[0030] dOxygen enrichment: 2500~4000m 3 / h.

[0031] eDo not use humidification steam.

[0032] III Slagging System

[0033] a MgO is controlled b...

Embodiment 2

[0035] MgO content 2.4%, Al 2 o 3 The vanadium-titanium sinter with a content of 2.6% is 62%, with 3% acid lump ore and 35% of vanadium-titanium pellets with a MgO content of 2.8%, and an appropriate amount of coke is sent to the blast furnace according to the conventional distribution method. System for smelting:

[0036] I blast furnace heat system

[0037] a molten iron temperature: 1400 ~ 1450 ℃.

[0038] b. The temperature of the slag is controlled between the upper hot ash and the oil fruit.

[0039] c [Si], [Ti] control: 0.28% ≤ [Si] + [Ti] ≤ 0.55%.

[0040] II air supply system

[0041] a Try to achieve full wind operation to maintain high smelting intensity and blast kinetic energy.

[0042] b Full air temperature operation, kept above 1100 ℃.

[0043] c The coal injection ratio is maintained at 100-125kg / tFe.

[0044] dOxygen enrichment: 2500~4000m 3 / h.

[0045] eDo not use humidification steam.

[0046] III Slagging System

[0047] a MgO is controlled b...

Embodiment 3

[0049] MgO content 2.6%, Al 2 o 3 The vanadium-titanium sinter with a content of 2.6% is 64%, with 3% acid lump ore and 33% of vanadium-titanium pellets with a MgO content of 2.8%, and an appropriate amount of coke is sent into the blast furnace according to the conventional distribution method. System for smelting:

[0050] I blast furnace heat system

[0051] a molten iron temperature: 1400 ~ 1450 ℃.

[0052] b. The temperature of the slag is controlled between the upper hot ash and the oil fruit.

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Abstract

The invention discloses a blast furnace smelting process used for high-vanadium-titanium low-MgO furnace slag and belongs to the technical field of blast furnace steelmaking. The blast furnace smelting process disclosed by the invention comprises the following step of: smelting after vanadium-titanium sintering ore, acid lump ore, vanadium-titanium pellet and coke cloth are placed into a blast furnace, wherein the vanadium-titanium sintering ore contains 2.2-2.6wt% of MgO and 2.4-2.8wt% of Al2O3; and during smelting, the basicity of the furnace slag is controlled to meet the condition that CaO / SiO2 is equal to 1.28-1.33, the physical thermal of molten iron is more than or equal to 1450 DEG C, and the content of MgO in the blast furnace slag is controlled to be 6.8-8.5%, the content of Al2O3 is controlled to be 11-13% and the content of TiO2 is controlled to be 18-21%. The blast furnace smelting process disclosed by the invention has the advantages that the usage amount of solvent can be reduced, the quantity of slag can be reduced and the TFe grade of charge ore is improved in a high-vanadium-titanium ore smelting process, and the obtained furnace slag has good melting property, liquidity and desulphurization capability; and high-vanadium-titanium magnetic iron ore can be reasonably used, the production cost of a blast furnace is reduced, and the comprehensive economic benefit of an enterprise is increased.

Description

technical field [0001] The invention belongs to the technical field of blast furnace steelmaking, and in particular relates to a blast furnace smelting method of high vanadium titanium and low MgO slag. Background technique [0002] With the continuous increase of the proportion of vanadium and titanium into the furnace, the TiO in the blast furnace slag of vanadium and titanium ore smelting 2 The content reaches 18-21%, Al 2 o 3 The content is 11-13%, but the sulfur load per ton of iron is as high as 6.5-8.0Kg / t. In this case, the blast furnace slag must have a desulfurization capacity of more than 90% to ensure qualified sulfur in the molten iron. Therefore, the slag has a high alkalinity, generally around 1.25 to 1.35. MgO in blast furnace slag is generally 9%, which brings about the increase of solvent usage, the decrease of sinter TFe grade, and the increase of production cost before iron production. If the content of MgO in the slag is only reduced in blast furnace...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/04
Inventor 向健程春华李毅印建辉陈仁宏
Owner SICHUAN CHUANWEI GRP CO LTD
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