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Furnace protecting acid pellet and production technology thereof

A technology of oxidizing pellets and production process, applied in the direction of furnace, blast furnace, blast furnace details, etc., can solve the problems of low total amount of titanium dioxide, increased process difficulty, failure to achieve furnace protection effect, etc.

Inactive Publication Date: 2004-12-29
TAIHE IRON MINE CHONGQING IRON & STEEL GROUP MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low total amount of titanium dioxide after entering the furnace, the resulting titanium carbide and titanium nitride are relatively thin, which cannot achieve the ideal furnace protection effect.
And due to the smelting characteristics of vanadium-titanite itself, its ball-forming performance is poor, and roasting is difficult, especially when the content of titanium dioxide increases, its ball-forming performance is even worse, the process difficulty during roasting increases, and the production cost increases relatively. Big

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Grind vanadium-titanium iron concentrate and coarse titanium concentrate to -200 mesh particle size content of 70% and mix it into a raw material with a total iron grade of 54.8% and a titanium dioxide content of 17%, and mix it with bentonite binder accounting for 2-2.5% of the weight of the material Homogenize the pelletizing material, the bentonite binder is sodium-based bentonite; then put the pelletizing material into a cylinder dryer for drying, the drying temperature is controlled at 400-500°C, and the moisture content of the dried pelletizing material Control at 7% to 7.5%; the dried pelletizing material enters the disc pelletizer, and adopts a disc with an inclination angle of 47° and a rotating speed of 7 to 9 revolutions / min to produce oxidized pellets; Qualified oxidized pellets with a strength of 5.2 times / piece, a compressive strength of 14.3N / piece, and a particle size of 8mm to 18mm are roasted in a shaft furnace. 28 minutes; the roasted oxidized pellets...

Embodiment 2

[0013] Raw materials of vanadium-titanium iron concentrate and coarse titanium concentrate-200 mesh particle size 75%, total iron grade 53.9%, titanium dioxide content 19%, 2-2.5% bentonite binder, drying temperature 400-500 ℃, pelletizing The material moisture is 7% to 7.5%, the disc inclination angle of the pelletizing machine is 47°, the speed is 7 to 9 revolutions / min, the drop strength of the oxidized pellets is 5.6 times / piece, the compressive strength is 14.5N / piece, and the particle size is 8 to 18mm , put into the furnace and bake at 1220°C, peroxygen concentration 6.7%, roast for 28 minutes, cooling rate not more than 200°C / min, and furnace temperature below 500°C to get out of the furnace; the compressive strength is 2630N / piece, the grade of total iron is 52.4%, and titanium dioxide High-titanium furnace-protected oxidation pellets with a content of 17.6% and a ferrous content of 1.22%.

Embodiment 3

[0015] Raw materials of vanadium-titanium iron concentrate and coarse titanium concentrate-200 mesh particle size 80%, total iron grade 52.9%, titanium dioxide content 20%, 2-2.5% sodium-based bentonite binder, drying temperature 400-500 ℃, The moisture content of the pelletizing material is 7-7.5%, the disc inclination angle of the pelletizing machine is 47°, the rotating speed is 7-9 revolutions / min, the drop strength of the oxidized pellets is 4.8 times / piece, the compressive strength is 14.2N / piece, and the particle size is 8~ 18mm, baked in the furnace at 1220°C, peroxygen concentration 6.7%, roasted for 28 minutes, cooling rate is not more than 200°C / min, and the furnace temperature is below 500°C; the compressive strength is 2320N / piece, the total iron grade is 51.1%, High-titanium furnace-protected oxidation pellets with a titanium dioxide content of 18.5% and a ferrous content of 1.15%.

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Abstract

The furnace protecting oxide pellet is produced through grinding and mixing V-Ti concentrate and coarse concentrated titanium ore into material containing iron in 52-55 wt% and titania 17-20 wt%, mixing with bentonite as adhesive, stoving at 400-500 deg.c, making raw oxide pellet in a disc pellet making machine, roasting at 1200-1250 deg.c under over oxygen concentration 4-8 % for 15-30 min, cooling in the furnace, and sieving to obtain the furnace protecting oxide pellet with iron content of 50-53 wt%, titania content of 15-18.5 wt%, ferrous content lower than 1.5 wt%, and compression strength of 1500-2800 N each. The furnace protecting oxide pellet has excellent performance, and good furnace protecting effect.

Description

technical field [0001] The invention relates to an oxidized pellet and its production process, in particular to a high-titanium oxidized pellet for ironmaking and furnace protection and its production process. Background technique [0002] In the metallurgical industry, titanium-containing oxide pellets are added to the blast furnace during ironmaking. During the smelting process, titanium is reduced to form titanium carbide and titanium nitride at the bottom of the blast furnace to form a thick titanium deposit that resists the erosion of slag iron on the furnace lining. Protect ironmaking blast furnace and prolong the life of blast furnace. At present, the content of titanium dioxide in domestically produced vanadium-titanium oxide pellets is relatively low, generally 7% to 12%. For example: Chengde Iron and Steel Company uses a rotary kiln production process, the particle size of 60% to 70% of its ilmenite concentrate raw materials is -200 mesh, the total iron grade is 5...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00C22B1/00
Inventor 陈大元梁典德李从德吴丰祥杨大明
Owner TAIHE IRON MINE CHONGQING IRON & STEEL GROUP MINING
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