CN109503181A - A kind of reducing atmosphere kiln castable - Google Patents

A kind of reducing atmosphere kiln castable Download PDF

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Publication number
CN109503181A
CN109503181A CN201811514060.XA CN201811514060A CN109503181A CN 109503181 A CN109503181 A CN 109503181A CN 201811514060 A CN201811514060 A CN 201811514060A CN 109503181 A CN109503181 A CN 109503181A
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reducing atmosphere
follows
atmosphere kiln
sio
castable
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马军强
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Luoyang Kechuang New Material Co Ltd
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Luoyang Kechuang New Material Co Ltd
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    • 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
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • C—CHEMISTRY; METALLURGY
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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
    • C04B35/01—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
    • C04B35/16—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 silicates other than clay
    • C04B35/18—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 silicates other than clay rich in aluminium oxide
    • C04B35/185—Mullite 3Al2O3-2SiO2
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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
    • C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
    • C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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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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    • C04B2235/30—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
    • C04B2235/3218—Aluminium (oxy)hydroxides, e.g. boehmite, gibbsite, alumina sol
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    • 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
    • C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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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
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
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    • 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
    • C04B2235/02—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
    • C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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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
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
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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
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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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
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts

Abstract

Present invention relates particularly to a kind of reducing atmosphere kiln castables.Its technical solution is: castable uses low iron flake alabaster clinker, low iron oxide red pillar and high-purity corundum for primary raw material, using aluminous cement-hydrated alumina-silicon powder as combined binder.The castable has stronger room temperature vulcanizing ability and higher elevated temperature strength；The thermal shock resistance of castable greatly improved in zirconium oxide in silicon powder；The raw materials used iron content of castable is low, and Resistance to CO performance is higher, and can effectively avoid furnace lining becomes abnormal loose, greatly improves the service life of reducing atmosphere kiln.

Description

A kind of reducing atmosphere kiln castable
Technical field
The invention belongs to technical field of refractory materials, and in particular to a kind of reducing atmosphere kiln castable.
Background technique
Currently, the furnace lining of many high temperature kilns is built using clay brick, high-alumina brick, the typical case of high-alumina brick and clay brick is special Point is that iron content is higher, and atmosphere is the kiln of reducing atmosphere in unsuitable burner hearth, because are as follows: the resistance to material of furnace lining encounters at high temperature When the CO atmosphere of reproducibility, on the one hand, Fe2O3It can be gradually by CO gas reduction at Fe or Fe3C, on the other hand since CO is decomposed, Free C will be deposited around metallic iron in the material, and furnace lining institutional framework is made to become very loose, even burst apart.It is using In the process, high-temperature flue gas strongly wash away, the fluctuation of fire box temperature, can cause furnace lining large area peeling.When furnace lining is damaged very When serious, it is necessary to which blowing out is repaired, not only waste of energy, but also influences being normally carried out for production.
Summary of the invention
To solve the above problems, the present invention is intended to provide a kind of castable of suitable reducing atmosphere kiln, can restore There is stronger Resistance to CO ability, while thermal shock resistance also with higher in atmosphere.
To achieve the above object, the technical solution adopted by the present invention is that: castable use low iron flake alabaster clinker, low iron oxide red Pillar and high-purity corundum are primary raw material, and articulated system is fit using aluminous cement-hydrated alumina-silicon powder composite junction System.
A kind of reducing atmosphere kiln castable of the present invention, component and weight content are as follows:
Component particle size weight content
Pyrophyllite clinker 5-3mm 25-30%
Andalusite 3-1mm 20-25%
Andalusite 1-0mm 10-20%
325 mesh 15-25% of corundum
325 mesh 0-1.5% of pure calcium aluminate cement
20 μm of 2-4% of hydrated alumina
3 μm of 2-6% of alumina powder
2 μm of 3-7% of silicon powder containing zirconium
Explosion-proof fiber 0.02-0.1%
Water-reducing agent 0.05-0.15%.
The pyrophyllite clinker is low iron flake alabaster, the mass percent of chemical constituent are as follows: Al2O3>=16%, SiO2≤ 75%, Fe2O3≤ 0.5%.
The andalusite is the low iron oxide red pillar of level-one, the mass percent of chemical constituent are as follows: Al2O3>=58%, SiO2≤ 41%, Fe2O3≤ 0.6%.
The corundum is at least one of plate diamond spar, white fused alumina, the mass percent of chemical constituent are as follows: Al2O3≥ 99%, SiO2≤ 0.2%, Fe2O3≤ 0.1%, R2O≤0.4%.
The alumina powder is Alpha-alumina micro mist, the mass percent of chemical constituent are as follows: Al2O3>=99.2%, SiO2≤ 0.15%, Fe2O3≤ 0.1%.
The silicon powder containing zirconium is the byproduct of desilicated zirconia, the mass percent of chemical constituent are as follows: SiO2>=95%, ZrO2≤ 5%, R2O≤0.1%.
The pure calcium aluminate cement is in peace CA270 cement advanced in years, An Mai CA670 cement, Kai Nuosi SECAR-71 cement Any one, the mass percent of chemical constituent are as follows: Al2O3>=68%, SiO2≤ 0.25%, CaO≤32%.
The hydrated alumina is ρ-aluminium oxide, the mass percent of chemical constituent are as follows: Al2O3>=95%, SiO2≤ 0.2%, igloss≤5%.
The explosion-proof fiber is low melting point explosion-proof fiber, specification are as follows: long 3-5mm, 20-50 μm of diameter, fusing point 60-100 ℃。
The water-reducing agent is BASF CASTAMENT FS20.
Compared with prior art, bring of the present invention has the beneficial effect that micro- using aluminous cement-hydrated alumina-silicon Powder mixed binding system, so that castable has stronger room temperature vulcanizing ability and higher elevated temperature strength；Oxygen in silicon powder Change zirconium to be dispersed in construction body, there is toughening effect, the thermal shock resistance of castable can be greatly improved；Original used in castable Expect that iron content is low, Resistance to CO performance is higher, and can effectively avoid furnace lining becomes abnormal loose, greatly improves reducing atmosphere kiln Service life.
Specific embodiment
Below in conjunction with specific embodiment, invention is further described in detail, not to the limitation of its protection scope.
Embodiment 1
Reducing atmosphere kiln casting material formula:
Component particle size weight content
Pyrophyllite clinker 5-3mm 28%
Andalusite 3-1mm 22%
Andalusite 1-0mm 17%
325 mesh 18.45% of plate diamond spar
Pacify and steps 325 mesh 0.5% of CA270 cement
20 μm 3% of hydrated alumina
3 μm 5% of Alpha-alumina micro mist
2 μm 6% of silicon powder containing zirconium
Explosion-proof fiber 0.05%
CASTAMENT FS20 0.1%.
The main physical and chemical index of the present embodiment reducing atmosphere kiln castable are as follows:
Chemical component: Al2O356.1%, SiO242.6%, Fe2O30.36%；
Matrix mine phase composition: after 1450 DEG C of firings, principal crystalline phase is mullite to matrix XRD as the result is shown；
Thermal shock resistance:Room temperature water cooling, thermal shock number 56 times.
Resistance to CO performance: examination criteria uses the U.S. " refractory material slaking test method in CO atmosphere " (ASTMC288).Testing result shows that sample is uninfluenced, i.e., does not occur grain and crackle.
Embodiment 2
Reducing atmosphere kiln casting material formula:
Component particle size weight content
Pyrophyllite clinker 5-3mm 30%
Andalusite 3-1mm 20%
Andalusite 1-0mm 17%
325 mesh 19.39% of white fused alumina
Pacify and steps 325 mesh 1% of CA670 cement
20 μm 2.5% of hydrated alumina
3 μm 4% of Alpha-alumina micro mist
2 μm 6% of silicon powder containing zirconium
Explosion-proof fiber 0.03%
CASTAMENT FS20 0.08%.
The main physical and chemical index of the present embodiment reducing atmosphere kiln castable are as follows:
Chemical component: Al2O355.2%, SiO243.3%, Fe2O30.37%；
Matrix mine phase composition: after 1450 DEG C of firings, principal crystalline phase is mullite to matrix XRD as the result is shown；
Thermal shock resistance:Room temperature water cooling, thermal shock number 53 times.
Resistance to CO performance: examination criteria uses the U.S. " refractory material slaking test method in CO atmosphere " (ASTMC288).Testing result shows that sample is uninfluenced, i.e., does not occur grain and crackle.

Claims (10)

1. a kind of reducing atmosphere kiln castable, component and weight content are as follows:
2. reducing atmosphere kiln castable according to claim 1, it is characterised in that the pyrophyllite clinker is low iron Pyrophyllite, the mass percent of chemical constituent are as follows: Al2O3>=16%, SiO2≤ 75%, Fe2O3≤ 0.5%.
3. reducing atmosphere kiln castable according to claim 1, it is characterised in that the andalusite is the low iron of level-one Andalusite, the mass percent of chemical constituent are as follows: Al2O3>=58%, SiO2≤ 41%, Fe2O3≤ 0.6%.
4. reducing atmosphere kiln castable according to claim 1, it is characterised in that the corundum is plate diamond spar, white At least one of corundum, the mass percent of chemical constituent are as follows: Al2O3>=99%, SiO2≤ 0.2%, Fe2O3≤ 0.1%, R2O≤0.4%.
5. reducing atmosphere kiln castable according to claim 1, it is characterised in that the alumina powder is α-oxygen Change aluminium micro mist, the mass percent of chemical constituent are as follows: Al2O3>=99.2%, SiO2≤ 0.15%, Fe2O3≤ 0.1%.
6. reducing atmosphere kiln castable according to claim 1, it is characterised in that the silicon powder containing zirconium is desiliconization The byproduct of zirconium, the mass percent of chemical constituent are as follows: SiO2>=95%, ZrO2≤ 5%, R2O≤0.1%.
7. reducing atmosphere kiln castable according to claim 1, it is characterised in that the pure calcium aluminate cement is peace Step CA270 cement, An Mai CA670 cement, any one in Kai Nuosi SECAR-71 cement, the quality percentage of chemical constituent Than are as follows: Al2O3>=68%, SiO2≤ 0.25%, CaO≤32%.
8. reducing atmosphere kiln castable according to claim 1, it is characterised in that the hydrated alumina is ρ-oxygen Change aluminium, the mass percent of chemical constituent are as follows: Al2O3>=95%, SiO2≤ 0.2%, igloss≤5%.
9. reducing atmosphere kiln castable according to claim 1, it is characterised in that the explosion-proof fiber is low melting point Explosion-proof fiber, specification are as follows: long 3-5mm, 20-50 μm of diameter, 60-100 DEG C of fusing point.
10. reducing atmosphere kiln castable according to claim 1, it is characterised in that the water-reducing agent is BASF CASTAMENT FS20。
CN201811514060.XA 2018-12-04 2018-12-04 A kind of reducing atmosphere kiln castable Pending CN109503181A (en)

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Publication number Priority date Publication date Assignee Title
CN110156445A (en) * 2019-05-29 2019-08-23 濮阳濮耐高温材料（集团）股份有限公司 A kind of rotary hearth furnace high-strength wear-resistant pouring material and preparation method thereof
CN112898036A (en) * 2021-04-25 2021-06-04 河南众投冶金材料有限公司 High-performance mullite castable and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110156445A (en) * 2019-05-29 2019-08-23 濮阳濮耐高温材料（集团）股份有限公司 A kind of rotary hearth furnace high-strength wear-resistant pouring material and preparation method thereof
CN110156445B (en) * 2019-05-29 2022-04-19 濮阳濮耐高温材料（集团）股份有限公司 High-strength wear-resistant castable for rotary hearth furnace and preparation method thereof
CN112898036A (en) * 2021-04-25 2021-06-04 河南众投冶金材料有限公司 High-performance mullite castable and preparation method thereof

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Application publication date: 20190322