CN1839208A - Refractory composition for constructing dome portion of fluidized bed reduction furnace for reduction of iron ore - Google Patents

Refractory composition for constructing dome portion of fluidized bed reduction furnace for reduction of iron ore Download PDF

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CN1839208A
CN1839208A CNA2004800240584A CN200480024058A CN1839208A CN 1839208 A CN1839208 A CN 1839208A CN A2004800240584 A CNA2004800240584 A CN A2004800240584A CN 200480024058 A CN200480024058 A CN 200480024058A CN 1839208 A CN1839208 A CN 1839208A
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fluidized bed
reduction furnace
dome portion
iron ore
bed reduction
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崔导文
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CHOSUN REFRACTORIES Co Ltd
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CHOSUN REFRACTORIES Co Ltd
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62645—Thermal treatment of powders or mixtures thereof other than sintering
    • C04B35/62665—Flame, plasma or melting treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1808—Removable covers
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/72—Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
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    • C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts

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  • Crucibles And Fluidized-Bed Furnaces (AREA)
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  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

The present invention relates to refractory composition for construction of a dome portion of a fluidized bed reduction furnace for reduction of iron ore powder in a FINEX process which is a new iron production method, to provide castable refractory having properties of corrosion resistance so as to be chemically stable in a reductive gas environment, thermal impact resistance, and mechanical strength. For this, the refractory composition includes 1.5 ~ 2.5wt% of silica SiO2, below 0.05wt% of Fe2O3, 8 ~ 11wt% of CaO, and balance of alumina Al2O3, to make up 100wt% of the refractory composition.

Description

The fire proofing composition of dome portion in the fluidized bed reduction furnace of construction reduction of iron ore
Technical field
The present invention relates to a kind of refractory materials, it is used for building the dome portion of the fluidized bed reduction furnace of reduced iron breeze, more specifically, the present invention relates to a kind of fire proofing composition, it has the good chemical-resistant of high strength, excellent wear, tolerance reducing gas, good resistance to sudden heating and good workability, is used for building the dome portion in the fluidized bed reduction furnace that the FINEX method adopts.
Background technology
In modern steel production, adopt the molten pig of at first making is carried out the indirect method that carbonization treatment is made steel.Molten pig is to adopt blast furnace process to make, and wherein adopts coke to act as a fuel.
Fig. 1 adopts blast furnace process to make the synoptic diagram of the method for iron, wherein when adopting the coke that makes by flame coal to act as a fuel, iron ore is through pretreatment technology, to iron ore pulverize, selected, powdered iron ore briquetting, sintering are formed the hard sphere shape, this hard sphere is the agglomerate with the predetermined size in the blast furnace of can packing into.This hard sphere and coke are packed in the blast furnace, carry out roasting to obtain molten pig.
Although blast furnace process is the extensive at present best iron smelting method of making iron, but blast furnace process is owing to complex process and require extra independent large-scale equipment to be used for sintering and make coke to have the high characteristics of cost, and caused from sintering iron ore and coke manufacturing process, discharging sulfur oxide SO,, nitride NO,, carbonic acid gas CO 2Problem Deng environmental pollutant.
The Korea S steel-making POSCO of company has developed a kind of equipment, wherein the powdered iron ore that changed into directly by fluidized reaction reduction native state of this manufacture method of blast furnace process need not iron ore and coke are carried out pre-treatment, the Korean Patent Application No. of its patent is 10-1995-41931, Korean patent registration No. is 10-236160, this method is called as the FINEX method, and this equipment has built up and dropped in the near future test operation.
Fig. 2 is a synoptic diagram of the present invention being used iron smelting method FINEX method wherein, and Fig. 3 then is the enlarged view of fluidized bed reduction furnace among Fig. 2.The FINEX method is a kind of novel iron production method that is used for making economically molten pig, wherein powdered iron ore progressively is reduced by a plurality of segmentations of fluidized bed reduction furnace 1, and be that the coal cinder of 8-50mm is encased in the smelting furnace 3 to form molten pig with particle diameter, wherein particle diameter has formed particle (HCI for a plurality of segmentations of the powdered iron ore process fluidized bed reduction furnace 1 of about 8mm change the iron ore that is reduced into; Hot Compact Iron), be loaded in the smelting furnace then.
Have the fluidized bed reduction furnace that seals dome portion 4 is provided with post (cloumn, not shown) upper support at the fluid bed reduction furnace interior distribution plate (distribution plate) 2.Distribution plate is to be used in fluidized bed reduction furnace uniformly distributing high pressure, the pyritous reducing gas device with fluidisation and reduced iron breeze, and distribution plate has a plurality of through holes and is used to penetrate gas.
The dome portion 4 of fluidized bed reduction furnace can by with refractory materials attached to forming on the dome structure framework because refractory materials can not directly be introduced into the fluid bed reduction furnace interior, refractory materials need spray by the injector of fluidized bed reduction furnace.Need the fire-proof construction of injector to be enough to stablize, even in high pressure, pyritous reducing gas atmosphere, when the fast lifting temperature, also can tolerate.
Therefore, the refractory materials that is ejected and be used for building dome structure 4 in the fluidized bed reduction furnace 1 by injector is a kind ofly to have chemical-resistant, especially have a material of erosion resistance, resistance to sudden heating and the high mechanical strength of anti-CO gas.
Because the equipment of FINEX method is first equipment in the world, also be not used in the material of building dome portion 4 in the correlation technique.Yet, beat up the castable material that has used high alumina content in being equipped with at prototype version, but this refractory materials is during operation owing to tolerance difference and the low problem that causes the contraction aspect of resistance to sudden heating to CO gas, and produces many crackles and break away from.
Therefore, because Reaktionsofen is not the equipment that is used for small test, but be used for the annual equipment of producing 1,000,000 tons large-scale commercial applications production, therefore the material that requires dome portion 4 near working temperature 600-1000 ℃ the time not with reducing gas and iron ore in various composition generation chemical reactions, have good wear resistance under high temperature, high speed powdered iron ore fluidization conditions, having good resistance to sudden heating is enough to tolerate with andnon-continuous operation manner and carries out being rapidly heated and lowering the temperature after the retry.
In addition, the arched roof part 4 of fluidized bed reduction furnace 1 can not form in certain of stove 1 outside fully with heat-resisting state, and the structure according to design is installed on the stove 1 again, but by forming on the arched roof framework that heat-stable material is adhered to dome structure 4.Therefore, need the processability of heat-stable material to guarantee that the on-fixed form of this material can eject by injected device, and for the such macrostructure of dome structure, even structure can not deform in curing after building and the drying process, or explosion can not take place in structure during building.
Because working conditions harshness, especially the thermal shocking that causes by the fast lifting temperature, for the commercial equipment of non-test equipment, should be satisfied the following standard of product by the material require that prediction is used to build dome portion: density of texture is lower than 2.55, and the anti-dry-pressing intensity under the working temperature is 750kg/cm 2Or higher, be higher than 30% porosity, the CO gas resistance is higher than the A-B level of ASTMC288.
Summary of the invention
One of purpose of the present invention is to provide a kind of fire proofing composition that is used for building fluidized-bed reaction stove dome portion, it is different from the tentative fire proofing composition of association area, when progressively being reduced in many segmentations of the powdered iron ore with wide region particle size distribution at fluidized bed reduction furnace, said composition has erosion resistance so that still keep the stability of chemical property when being in the reducing gas atmosphere, and has resistance to sudden heating and physical strength.
Purpose of the present invention can realize that this fire proofing composition comprises the silicon-dioxide SiO of 1.5-2.5wt% by the fire proofing composition of dome structure in the fluidized bed reduction furnace that is provided for building the reduced iron breeze 2, be lower than the Fe of 0.05wt% 2O 3, the CaO of 8-11wt% and the aluminium oxide Al of surplus 2O 3Thereby, make the 100wt% fire proofing composition.
Description of drawings
Being used for further understanding accompanying drawing of the present invention also explains embodiments of the present invention in conjunction with the explanation of explaining the principle of the invention.Among the figure:
Fig. 1 illustrates the synoptic diagram that adopts blast furnace process to make the method for iron;
Fig. 2 illustrates the process schematic representation of having used FINEX manufactured iron of the present invention;
The enlarged view of fluidized bed reduction furnace among Fig. 3 foot Fig. 2.
Preferred forms
Final fire proofing composition of the present invention has the silicon-dioxide SiO of 1.5-2.5wt% 2, be lower than the Fe of 0.05wt% 2O 3, the CaO of 8-11wt% and the aluminium oxide Al of surplus 2O 3Thereby, make the 100wt% fire proofing composition.Silicon-dioxide SiO wherein 2And Fe 2O 3Content be restricted to the workability that can guarantee composition and to the tolerance of CO gas, because work as SiO 2When content is lower than 1.5wt%, owing to lack silica composition, by utilizing then variation of operability that spray gun sprays, to the tolerance of CO gas also variation, or the sintering shrinkage phenomenon when high temperature, occurs under the high temperature and high pressure, work as SiO 2When content was higher than 2.5wt%, resistance to sudden heating descended.Fe 2O 3Interpolation be the tolerance that is used to obtain to CO gas, preferably its content is lower than 0.05wt%.
CaO is a CaO content contained in the material, as when adopting alundum cement.The CaO that is lower than 8wt% can cause can not guaranteeing workability (promptly, no matter adopt which kind of cement or no matter adopt CaO in which kind of starting material), the result can cause the reduction of adhesive rate in the structure, causes the increase of resilience loss (rebound loss), and can not guarantee desirable strength.
The CaO content that is higher than 11wt% can cause aluminium oxide Al 2O 3The degree of falling of content, thus strength degradation under the high temperature caused, cause the resistance to sudden heating variation, even workability and intensity all can be guaranteed.
Aluminium oxide Al as main component 2O 3, can adopt agglomerating or fused aluminum oxide, be used in the strong reducing property environment owing to be applied to fluidized bed reduction furnace 1 of the present invention, the content of preferred aluminum oxide is higher than 95%.
Composition for whole 100wt%, the content of main component aluminum oxide should not be too low, this will increase the content (all the other compositions except that main component) of other submember, thereby is difficult to obtain above-mentioned performance, and the increase of CaO content can make strength degradation, in contrast, if the content of main component aluminum oxide is too high, can reduces the content of other composition relatively, thereby be difficult to obtain described performance, and density is increased, porosity drops to and is lower than 30%.
Fire proofing composition of the present invention, this material that is used for building fluidized bed reduction furnace 1 dome portion 4 of reduced iron breeze, it is a kind of fire proofing composition based on aluminum oxide, it has density of texture and is lower than 2.55, porosity in the time of 1000 ℃ is 30% or higher, and anti-dry-pressing intensity is 750kg/cm 2Or higher, dome structure resilience loss is lower than 10%, and the tolerance of CO gas is the A-B level of ASTMC288 or higher.
The fire proofing composition that following table 1 illustrates the fluidized bed reduction furnace dome portion that is used for building the FINEX method is applied to the comparison in test equipment (comparing embodiment) and the commercial equipment (embodiment).
Table 1
Comparing embodiment Embodiment
Use Test equipment Commercial equipment
Method of construction Build internally The employing injector is built
Chemical constitution ?Al 2O 3 ?93 ?87
?SiO 2 ?1 ?1.7
?Fe 2O 3 ?0.01 ?0.01
?CaO ?9.5
Bulk specific gravity kg/m 3 ?2,900 ?2,520
1000 ℃ of porositys (%) ?31
Ultimate compression strength (kg/cm 2) ?110℃ ?450 ?800
?1000℃ ?300 ?400
CO gas resistance ASTMC288 ?A ?A
Structure resilience loss (%) ?10
The injector of the injection fire proofing composition of the present invention that adopts during dome portion 4 in building fluidized bed reduction furnace 1 has exhaust pressure 2kg/cm 2, 2kg/cm is pressed in draining 2Or it is higher.
Industrial applicability
Owing to can guarantee the adding property that basic design is required from the refractory materials based on aluminum oxide that fire proofing composition of the present invention obtains, and when having 1000 ℃ 30% or higher porosity, anti-dry-pressing intensity is 750kg/cm 2Or it is higher, the resilience loss is 10% or lower, the CO gas resistance is the A-B level of ASTM C288, the dome portion of the fluidized bed reduction furnace that fire proofing composition is built prevented the structural distortion in curing or the manufacture process or build during explosion, and has erosion resistance so that still keep the stable of chemical property when being in the reducing gas environment, also have resistance to sudden heating and high mechanical strength, therefore have very high industrial applicibility.
It will be apparent for a person skilled in the art that and to carry out various retouchings and change to the present invention and do not depart from the spirit or scope of the present invention.Therefore, this invention is intended to cover various retouching of the present invention and change, condition is that these retouchings and change fall in the scope of accompanying Claim and its Equivalent.

Claims (1)

1. refractory materials, it is used for building the dome portion of the fluidized bed reduction furnace of reduced iron breeze, and this fire proofing composition comprises the silicon-dioxide SiO of 1.5-2.5wt% 2, be lower than the Fe of 0.05wt% 2O 3, the CaO of 8-11wt% and the aluminium oxide Al of surplus 2O 3Thereby, make the 100wt% fire proofing composition.
CNA2004800240584A 2003-08-26 2004-08-20 Refractory composition for constructing dome portion of fluidized bed reduction furnace for reduction of iron ore Pending CN1839208A (en)

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KR20030059132A KR100558653B1 (en) 2003-08-26 2003-08-26 refractory composition using dome part molding of fluid layer reduction furnace for reduction iron ore
KR1020030059132 2003-08-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105967664A (en) * 2016-05-09 2016-09-28 长兴盛华耐火材料有限公司 Castable with resistance to reducing atmosphere

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Publication number Priority date Publication date Assignee Title
CN102757252B (en) * 2012-08-09 2013-07-31 山国强 1080 m<3> blast furnace main iron runner castable
CN114105656B (en) * 2021-11-25 2022-11-18 吴丽贤 Production method of novel roasting-sintering desulfurization gun with high-temperature adhesive

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Publication number Priority date Publication date Assignee Title
US3060043A (en) * 1960-03-31 1962-10-23 Harbison Walker Refractories Refractory castable
CA1247151A (en) * 1985-06-24 1988-12-20 Thomas R. Kleeb Abrasion resistant refractory composition
ZA918446B (en) * 1990-12-13 1992-07-29 Heindrich Schroeder Le R Johan Monolithic refractory lining
DE4215939A1 (en) * 1992-05-14 1993-11-18 Bosch Gmbh Robert Sintered alumina product
US5512325A (en) * 1994-10-28 1996-04-30 Indresco Inc. Non-slumping, pumpable castable and method of applying the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105967664A (en) * 2016-05-09 2016-09-28 长兴盛华耐火材料有限公司 Castable with resistance to reducing atmosphere

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CN101759437B (en) 2013-11-27
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WO2005019482A1 (en) 2005-03-03
KR20050022109A (en) 2005-03-07

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