Furnace protecting acid pellet and production technology thereof

A technology of oxidizing pellets and production process, which is applied in furnaces, blast furnaces, and details of blast furnaces, etc. It can solve problems such as poor performance of pellets, thick and thin accumulation of titanium carbide and titanium nitride, and failure to achieve the effect of furnace protection.

Inactive Publication Date: 2006-09-27
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] The vanadium ilmenite concentrate and crude titanium concentrate are ground to -200 mesh with a particle size content of 70% and mixed into a raw material with a total iron grade of 54.8% and a titanium dioxide content of 17%, and mixed with a bentonite binder accounting for 2 to 2.5% by weight of the material Homogenize pelletizing materials, and the bentonite binder is sodium bentonite; then, the pelletizing materials are dried in a cylinder dryer, and the drying temperature is controlled at 400-500°C. The moisture content of the dried pelletizing materials Control at 7%~7.5%; the dried pelletizing material enters the disc pelletizing machine, and the oxidized pellets are made by the inclination angle of the disc 47° and the rotation speed of 7-9 revolutions / min; the prepared pellets are dropped The qualified green oxidized pellets with strength of 5.2 times / piece, compressive strength of 14.3N / piece, and particle size of 8mm~18mm are roasted in a shaft furnace and roaste...

Embodiment 2

[0013] Vanadium ilmenite concentrate and crude titanium concentrate raw materials-200 mesh, 75% particle size, 53.9% total iron grade, 19% titanium dioxide content, 2~2.5% bentonite binder, drying temperature 400~500℃, pelletizing The moisture content of the material is 7%~7.5%, the inclination angle of the pelletizer disc is 47°, the speed is 7~9 rpm, the drop strength of the oxidized pellets is 5.6 times / piece, the compressive strength is 14.5N / piece, and the particle size is 8~18mm , Enter the furnace for roasting temperature of 1220℃, peroxygen concentration of 6.7%, roasting for 28 minutes, cooling rate not more than 200℃ / min, and furnace temperature below 500℃; get the compressive strength of 2630N / piece, total iron grade of 52.4%, titanium dioxide High-titanium furnace-protected oxidized pellets with a content of 17.6% and a ferrous iron content of 1.22%.

Embodiment 3

[0015] Vanadium ilmenite concentrate and crude titanium concentrate raw materials-200 mesh particle size of 80%, total iron grade 52.9%, titanium dioxide content 20%, 2 to 2.5% sodium bentonite binder, drying temperature 400 to 500 ℃, The water content of pelletizing material is 7-7.5%, the inclination angle of pelletizing machine is 47°, the speed is 7-9 rpm, the drop strength of oxidized pellets is 4.8 times / piece, the compressive strength is 14.2N / piece, and the particle size is 8~ 18mm, roasting temperature of 1220℃, oxygen concentration of 6.7%, roasting for 28 minutes, cooling rate no more than 200℃ / min, and furnace temperature below 500℃; get a compressive strength of 2320N / piece, total iron grade of 51.1%, High-titanium furnace-protected oxidized pellets with a titanium dioxide content of 18.5% and a ferrous iron content of 1.15%.

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PUM

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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 type oxidized pellet used 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. The titanium buildup is formed at the bottom of the blast furnace to resist the corrosion of slag iron on the furnace lining. Protect the iron-making blast furnace and extend the life of the 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 the rotary kiln production process, the particle size of 60% to 70% of the ilmenite concentrate raw material is -200 mesh, the total iron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/00C21B5/00
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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