Low-cost blast furnace smelting method

A smelting method and blast furnace smelting technology, applied in the field of low-cost blast furnace smelting, can solve the problems of poor air permeability, high blast furnace smelting cost, and large consumption, and achieve the effects of improving air permeability, increasing blast furnace smelting intensity, and reducing fuel ratio

Inactive Publication Date: 2017-04-26
SICHUAN DESHENG GRP VANADIUM & TITANIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The smelting charge has poor air permeability, and coke is an important fuel for blast furnace smelting, which consumes a lot, resulting in high cost of blast furnace smelting

Method used

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  • Low-cost blast furnace smelting method
  • Low-cost blast furnace smelting method
  • Low-cost blast furnace smelting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A low-cost blast furnace smelting method, the smelting method comprising:

[0036] Upper adjustment: add coke with a particle size range of 8 to 20 mm into vanadium-titanium sintered ore, vanadium-titanium sintered ore, vanadium-titanium pellets and pig iron, and mix uniformly to form an ore layer; the vanadium-titanium sintered ore, the The mass ratio of the vanadium-titanium sinter ore, the vanadium-titanium pellets and the pig iron is 31:50:27:20, and the coke and the ore layers are alternately distributed into the blast furnace to form the ore-forming stone layer And the alternate layered structure of the coke layer, the coke is composed of high-strength coke and low-strength coke, the high-strength coke includes CDQ; the coke composition is composed of high-strength coke 70wt% and low-strength coke 25wt%. The CDQ accounted for 49.2wt% of the high strength coke.

[0037] Do not adjust: if Figure 1 ~ Figure 3 As shown, the blast furnace hearth includes 20 tuyeres ...

Embodiment 2

[0041] A low-cost blast furnace smelting method, the smelting method comprising:

[0042] Upper adjustment: add coke with a particle size range of 8 to 20 mm into vanadium-titanium sintered ore, vanadium-titanium sintered ore, vanadium-titanium pellets and pig iron, and mix uniformly to form an ore layer; the vanadium-titanium sintered ore, the The mass ratio of the vanadium-titanium sinter ore, the vanadium-titanium pellets and the pig iron is 31:50:27:20, and the coke and the ore layers are alternately distributed into the blast furnace to form the ore-forming stone layer And the alternate layered structure of the coke layer, the coke is composed of high-strength coke and low-strength coke, and the high-strength coke includes CDQ; the coke composition is composed of high-strength coke 73wt% and low-strength coke 27wt%. The CDQ accounted for 49.2wt% of the high strength coke.

[0043] Lower adjustment: such as Figure 1 ~ Figure 3As shown, the blast furnace hearth includes ...

Embodiment 3

[0047] A low-cost blast furnace smelting method, the smelting method comprising:

[0048] Upper adjustment: add coke with a particle size range of 8 to 20 mm into vanadium-titanium sintered ore, vanadium-titanium sintered ore, vanadium-titanium pellets and pig iron, and mix uniformly to form an ore layer; the vanadium-titanium sintered ore, the The mass ratio of the vanadium-titanium sinter ore, the vanadium-titanium pellets and the pig iron is 31:50:27:20, and the coke and the ore layers are alternately distributed into the blast furnace to form the ore-forming stone layer and the alternate layered structure of the coke layer, the coke is composed of high-strength coke and low-strength coke, the high-strength coke includes CDQ; the coke composition is composed of high-strength coke 75wt% and low-strength coke 30wt%, so The CDQ accounted for 49.2wt% of the high-strength coke.

[0049] Lower adjustment: such as Figure 1 ~ Figure 3 As shown, the blast furnace hearth includes ...

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Abstract

The invention discloses a low-cost blast furnace smelting method. The low-cost blast furnace smelting method comprises the steps that coke nut with the particle sizes ranging from 8 mm to 20 mm is added to sintered vanadium-titanium ores, small sintered vanadium-titanium ore cubes, vanadium-titanium pellets and pig iron, and an ore layer is formed through uniform mixing; and the coke and the ore layers are alternately fed into a blast furnace, so that an alternate layering structure of the ore layers and the coke layers is formed, wherein the coke is composed of high-strength coke and low-strength coke, and the high-strength coke comprises dry quenched coke. A hearth of the blast furnace comprises multiple tuyeres and two iron notches, wherein the two iron notches are symmetrical about the center axis of the hearth, the tuyeres are arranged above the iron notches and distributed circumferentially, the diameters of the tuyeres which are symmetrical about the center axis of the hearth are identical, and the diameters of the tuyeres located on the two sides of the iron notches are smaller than or equal to the diameters of the other tuyeres on the circumference. By the adoption of the low-cost blast furnace smelting method, the ventilation performance of blast furnace smelting is improved, the intensity of blast furnace smelting is improved, the fuel ratio is lowered, and the cost is lowered.

Description

technical field [0001] The invention relates to the technical field of ironmaking, in particular to a low-cost blast furnace smelting method. Background technique [0002] The blast furnace is a shaft furnace type counter-flow reactor, which is produced by blast furnace ironmaking and belongs to a continuous production process. The currently commonly used blast furnace smelting process includes coke being directly mixed with sinter, pellets, and lump ore in the throat of the furnace. Sinter, pellets, lump ore, coke, and the hot air blown into the blast furnace from the tuyeres and the high-temperature reducing gas produced by the combustion of coke and pulverized coal are reduced through complex physical and chemical reactions in the blast furnace. Liquid iron and slag are deposited in the furnace hearth and discharged regularly from the iron hole; blast furnace gas is recovered through the top gas system. The smelting charge has poor air permeability, and coke is an impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C21B7/16
CPCC21B5/00C21B5/007C21B5/008C21B7/16
Inventor 江青芳何益先王远征张杰闵荣辉
Owner SICHUAN DESHENG GRP VANADIUM & TITANIUM CO LTD
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