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Blast furnace smelting method of high-grade vanadium-titanium magnetite

A technology of vanadium-titanium magnetite and vanadium-titanium magnetite concentrate, which is applied in the field of blast furnace smelting of high-grade vanadium-titanium magnetite, can solve the problems of high production cost of blast furnace ironmaking, low vanadium content in molten iron, and low usage ratio. Achieve the effects of increasing vanadium content in molten iron, efficient comprehensive utilization, and increasing the use ratio

Inactive Publication Date: 2018-12-07
PANZHIHUA LIYU MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In recent years, the main method of blast furnace vanadium-titanium magnetite smelting is to sinter vanadium-titanium iron concentrate and ordinary fine ore to produce sintered ore, and to produce oxidized pellets by pelletizing vanadium-titanium iron concentrate and ordinary iron concentrate , and then add sinter, pellets and a small amount of lump ore into the blast furnace together with coke in a certain proportion, and the lower part blows the coke to generate reducing gas. Falling into the furnace hearth to complete the ironmaking and smelting process, and realize the separation of slag and iron; the proportion of vanadium-titanium magnetite in the furnace charge is generally 60-80% in this method; The quantity is low, and the production cost of blast furnace ironmaking is high

Method used

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  • Blast furnace smelting method of high-grade vanadium-titanium magnetite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of sintered ore: the raw materials in the sintered ore contain the following components by weight: 75 parts by weight of vanadium-titanium magnetite concentrate, 5 parts by weight of ordinary iron ore concentrate, 6 parts by weight of active lime, and 4 parts by weight of fuel (coke powder); The above raw materials are mixed, and then water is added to form a mixture with a water content of 7.8%. The mixture is put into a belt sintering machine for gas ignition and sintering, and the height of the material layer is controlled to be 600-800mm;

[0031] Preparation of pellets: mix 99 parts by weight of vanadium-titanium concentrate powder and 1 part by weight of bentonite to make vanadium-titanium pellets. The process parameters of the pellets: the particle size of the pellets is 10mm~16mm≧90%, and the moisture content of the raw pellets is controlled At 8.0% to 9.5%, drop strength ≥ 6 times, compressive strength index ≥ 1.5kg; pellet drying temperature 500°C, ...

Embodiment 2

[0035] Preparation of sintered ore: the raw materials in the sintered ore contain the following components by weight: 70 parts by weight of vanadium-titanium magnetite concentrate, 15 parts by weight of ordinary iron ore concentrate, 9 parts by weight of active lime, and 6 parts by weight of fuel (coke powder); The above raw materials are mixed, and then water is added to form a mixture with a water content of 7.5%. The mixture is put into a belt sintering machine for gas ignition and sintering, and the height of the material layer is controlled to be 600-800mm;

[0036] Preparation of pellets: mix 97 parts by weight of vanadium-titanium concentrate powder with 3 parts by weight of bentonite to make vanadium-titanium pellets. The process parameters of the pellets: the particle size of the pellets is 10mm~16mm≧90%, and the moisture content of the raw pellets is controlled At 8.0%~9.5%, drop strength ≥6 times, compressive strength index ≥1.5kg; pellet drying temperature 600°C, ti...

Embodiment 3

[0040] Preparation of sintered ore: the raw materials in the sintered ore contain the following components by weight: 55 parts by weight of vanadium-titanium magnetite concentrate, 25 parts by weight of ordinary iron ore concentrate, 13 parts by weight of active lime, and 7 parts by weight of fuel (coke powder); The above raw materials are mixed, and then water is added to form a mixture with a water content of 7.2%. The mixture is put into a belt sintering machine for gas ignition and sintering, and the height of the material layer is controlled to be 600-800mm;

[0041] Preparation of pellets: mix 98 parts by weight of vanadium-titanium concentrate powder and 2 parts by weight of bentonite to make vanadium-titanium pellets. The process parameters of the pellets: the particle size of the pellets is 10mm~16mm≧90%, and the moisture content of the raw pellets is controlled. 8.0%~9.5%, drop strength ≥6 times, compressive strength index ≥1.5kg; pellet drying temperature 550°C, time 1...

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Abstract

The invention discloses a blast furnace smelting method of high-grade vanadium-titanium magnetite, and belongs to the technical field of steel and iron smelting. The blast furnace smelting method of the high-grade vanadium-titanium magnetite comprises the following steps: sinters and pellets are mixed for blast furnace smelting to obtain molten iron and slag; the sinters comprise raw materials ofvanadium-titanium magnetite concentrates, iron concentrates, activated lime and fuels; and the pellets are pelletized by the vanadium-titanium magnetite concentrates and bentonite. The method preparesthe sinters and the pellets by using high-iron low-titanium vanadium-titanium magnetite concentrates; the sinters and the pellets are added in the blast furnace smelting to greatly increase the use ratio of the vanadium-titanium magnetite; and through the measures of high air temperature and oxygen-enriched air blowing, under the condition of 20-25% of the TiO2 content in the slag, the reinforcedsmelting of the vanadium-titanium magnetite is realized, the production cost in the blast furnace iron smelting is reduced, the vanadium content of the molten iron is increased, and the comprehensiveutilization of the vanadium-titanium magnetite is efficiently realized.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a high-grade vanadium-titanium magnetite blast furnace smelting method. Background technique [0002] In recent years, the main method of blast furnace vanadium-titanium magnetite smelting is to sinter vanadium-titanium iron concentrate and ordinary fine ore to produce sintered ore, and to produce oxidized pellets by pelletizing vanadium-titanium iron concentrate and ordinary iron concentrate , and then add sinter, pellets and a small amount of lump ore into the blast furnace together with coke in a certain proportion, and the lower part blows the coke to generate reducing gas. Falling into the furnace hearth to complete the ironmaking and smelting process, and realize the separation of slag and iron; the proportion of vanadium-titanium magnetite in the furnace charge is generally 60-80% in this method; The amount is low, and the production cost of blast furnace ir...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/008Y02P10/20
Inventor 何德伍马玉平
Owner PANZHIHUA LIYU MINING