CN110372339A - A kind of long-life iron runner castable and its construction method - Google Patents
A kind of long-life iron runner castable and its construction method Download PDFInfo
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- 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
- C04B35/101—Refractories from grain sized mixtures
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- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/14—Discharging devices, e.g. for slag
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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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- C04B2235/32—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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- C04B2235/34—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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Abstract
The invention discloses a kind of long-life iron runner castable and its construction methods.Composition is dense alumina 56~64% by mass percentage；Silicon carbide 0-1mm:5~13%；Ball pitch 2~3%；Pure calcium aluminate cement 1.5~2%；Alumina powder 7~12%；High-purity silicon dioxide micro mist 1~2%；Carborundum powder 11~13%；Nano carbon black 0.2-1%；Compound antioxidizer 1~2%；Metallic aluminium powder 0.1-0.2%, explosion-proof fiber 0~0.1%；Dispersing agent 0.1~0.2%；Air entraining agent 0.01~0.03%.Construction method: will stop capital construction mold and daily periodical repair mold year will be stopped capital construction die size year than daily periodical repair mold and widens 150mm, depth down 80mm using different sizes under the premise of bottom of trench iron runner castable thickness guarantees 500mm or more.
Description
Technical field
The invention belongs to field of material technology, and in particular to a kind of long-life iron runner castable.
Background technique
In recent years, with the run at high level of price of steel product, each iron and steel enterprise is in order to rob yield, carry out reinforcing smelting to blast furnace
Refining, blast furnace discharge yard iron runner is an important ring for iron-smelting process, and wherein the periodical repair cycle stretch-out of sow has pole to iron company
For important meaning.How under the premise of guaranteeing safe handling, guarantees the service life of iron runner material, extend the periodical repair of blast furnace
Period is an important topic.Tap drain has not repaired few places disposably and crosses iron and reaches 200,000 tons both at home and abroad at present, passes through
Repairing reaches having been reported that for 300,000 tons of iron, but disposably not repairing iron is more than having not been reported for 300,000 tons of iron.
On the other hand, overall pulling down is carried out to the residual lining of tap drain with ditch machine before the offline maintenance of each tap drain.When single mold
Often be difficult to ensure that tap drain has enough safety casting thickness, and tear that ditch intensity is big open, the huge mechanical force of high-power ditch machine and
Shaking force often shatters loose the residual lining of tap drain, hides some dangers for iron runner labour movement row.
CN201510114691.2 discloses a kind of fast toast spatter-proof iron runner castable and its application method.Use silica solution
In conjunction with scheme, furnace tapping pouring refractories can toast fastly, explosion-proof, construction time are short.But silica solution construction bothered, in the winter
Easily freeze in season failure, using effect not as good as cement be used in combination the service life, do not repaired disposably iron be not achieved it is of the present invention
Effect.
CN201510132196.4 discloses a kind of rapid-curing cutback iron runner castable, preparation method and application method.Mainly at
Divide includes titanium carbide, gangue, antioxidant, pure calcium aluminate cement, SILICA FUME, anti-knock agent and water-reducing agent；Achieve anti-thermal shock
Performance, scour resistance, erosion-resisting characteristics, antioxygenic property improve, and are greatly decreased with water consumption, also have quick-drying
Feature.But service life, disposably iron was not repaired effect of the present invention is not achieved.Cement solidification and gold are not solved
Belong to aluminium powder to get angry unmatched safety issue.
CN201010185737.7 discloses explosion-proof iron runner castable.Wherein joined anti-knock agent is aluminium powder, aluctyl, prevents
Quick-fried fiber.The rapid construction requirement of medium and small single iron mouth blast furnace iron runner can be met.But its amount of water is big, argillaceous etc.
Eutectic is more.Service life, disposably not repairing iron is not achieved effect of the present invention.
Summary of the invention
It is an object of that present invention to provide a kind of long-life iron runner castable and its construction methods, extend one generation gap of tap drain labour
Service life improves the stability of iron runner safe operation.
In order to achieve the above objectives, as follows using technical solution:
A kind of long-life iron runner castable, composition is by mass percentage are as follows:
According to the above scheme, the dense alumina partial size is 0-12mm；Al contained therein2O3> 98.5wt%, Fe2O3<
0.3wt%.
According to the above scheme, the carborundum aggregate partial size is 0-1mm, SiC content >=98.5%, Fe2O3< 0.3wt%.
According to the above scheme, the granularity of the ball pitch is not more than 1.5mm.
According to the above scheme, the pure calcium aluminate cement is pure 71 cement of calcium aluminate.
According to the above scheme, for the fineness of the alumina powder less than 1.2 microns, purity is greater than 99.5%；Its primary chemical
Ingredient is Al2O3> 99.5wt%, Na2O < 0.1wt%.
According to the above scheme, the fine silica powder SiO2> 99wt%, pH value is less than 4, and volume average particle size is less than 0.3
Micron.
According to the above scheme, the nano carbon black is N990 type.
According to the above scheme, SiC content >=98% in the carborundum powder, fineness are≤74um.
According to the above scheme, mixture of the compound antioxidizer for boron carbide powder and metallic silicon power, mass ratio 1:
3.5；Granularity≤45 μm of the metallic silicon power.
According to the above scheme, the explosion-proof fiber is Wei Nilun matter explosion-proof fiber, and fusing point is 90 DEG C, length is 5~3mm.
According to the above scheme, the metallic aluminium powder is the production of nitrogen atomization technique, and fineness is≤74um.
According to the above scheme, the dispersing agent contains the mixture of polyacrylate, polycarboxylic acids, alumina powder；Wherein poly- third
Olefin(e) acid salt: polycarboxylic acids: the mass ratio of alumina powder is 45:5:50.
According to the above scheme, the air entraining agent is amorphous state C 12 A 7.
The construction method of above-mentioned long-life iron runner castable, comprising the following steps: capital construction mold and daily fixed will be stopped year
The tool that repairs a die uses different sizes, under the premise of bottom of trench iron runner castable thickness guarantees 500mm or more, will stop capital construction mold year
Size widens 150mm, depth down 80mm than daily periodical repair mold.
Destruction of the ditch machine to tap drain when tearing ditch open can be effectively reduced using this bimodal manner, shortening is torn open the ditch time, and
And bottom of trench has enough casting thickness when ensure that tap drain casting, utmostly ensure that the entirety of each period tap drain casting
Property, to ensure that the service life and safety and stability of tap drain working lining.Using iron runner castable of the present invention and according to
Tap drain obtained by above construction method is not repaired the service life disposably and is reached 6 months, crosses iron and reaches 330,000 tons；The periodical repair period is also by original
That comes is increased to 5 months for 4 months.
The present invention has the beneficial effect that compared with the existing technology:
Compared with prior art, the invention has the benefit that
The high purity silica powder that newest import is used in (master) iron runner castable that the present invention innovates, this high purity silica powder
With the performance that traditional silicon powder does not have, cognition beyond people to traditional silicon powder:
Glass phase is apparently higher than general silica micro mist in high-purity silicon dioxide micro mist composition, and impurity content is extremely low.
High-purity silicon dioxide micro mist volume average particle size is only the 10% of general silica micro mist, and specific surface area is than common
Fine silica powder height nearly 50%, therefore its activity is higher.
High-purity silicon dioxide micro mist can reduce the amount of water of iron runner castable than general silica micro mist, improve iron runner
Bulk density, cold strength and the hot modulus of rupture of castable reduce the porosity of castable and the generation of eutectic phase, drop
Low erosion of the slag to castable.
2) air entraining agent using unbodied C 12 A 7 as iron runner castable that the present invention innovates, pours iron runner
Metallic aluminium powder in material feeding generates hydrogen in advance, gets angry when castable does not generate solidification intensity, opens gas vent, protects
The anti-spalling under the uniformity and the high-densit degree of material that castable is got angry is demonstrate,proved.
3) what the present invention innovated produces Germany N990R type nano carbon black as a kind of improvement for improveing slurry workability
Agent.Ordinary carbon black makes iron runner castable lose flowability or increase the amount of water of castable, bad using iron runner castable performance
Change, and the resistance to slag of castable not only can be enhanced in the nano carbon black, and keeps this castable preferable under high-densit state
Bleeding, the bubble that when vibration generates more evenly are changed.
4) bimodal manner being fabricated separately using capital construction and periodical repair mold that the present invention innovates to (master) iron runner castable into
Row construction, is effectively reduced destruction of the ditch machine to tap drain when tearing ditch open, shortens and tear the ditch time open, bottom of trench when ensure that tap drain casting
There is enough casting thickness, utmostly ensure that the globality of each period tap drain casting, to ensure that tap drain working lining
Service life and safety and stability.
Specific embodiment
Following embodiment further illustrates technical solution of the present invention, but not as limiting the scope of the invention.
For a better understanding of the present invention, below with reference to the embodiment content that the present invention is furture elucidated, but the contents of the present invention are not only
It is limited only to the following examples.
In following embodiment, the dense alumina is contained Al2O3> 98.5wt%, Fe2O3< 0.3wt%.Its partial size is
0-12mm；Mass percent shared by different-grain diameter particle in the dense alumina are as follows: 8-12mm 8%, 5-8mm 18%, 3-5mm
15%, 1-3mm 15%, 0-1mm 0-8%.
Silicon carbide 0-1mm:SiC the > 98.5wt%, Fe2O3< 0.3wt%.
The granularity of the ball pitch is not more than 1.5mm；The present invention selects high temperature ball pitch, and the pitch of the high carbon residue content has
Conducive to the slag resistance for promoting iron runner castable.
The pure calcium aluminate cement is pure 71 cement of calcium aluminate.Can effectively be promoted cement room temperature, in mild elevated temperature strength and
Thermomechanical property, main chemical compositions are Al in the aluminous cement2O3(68.5-70.5) wt.%, CaO (28.5-30.5)
Wt.% is practically free of other impurity.
Al in the alumina powder2O3> 99.5wt%, Na2O < 0.1wt%.Purity is high, sodium content is low, and fineness is
1.2 microns of d50 <, in 0.5um or so, crystal diameter fluctuation range is activity within 0.05um for former brilliant crystal diameter control
Highly stable, α inversion of phases rate reaches 95% or more, and with better water-reducing property, good fluidity, strength development is good.
The fine silica powder SiO2> 99wt%, pH value is less than 4, and volume average particle size is less than 0.3 micron.
The antioxidant is the mixture of boron carbide powder and metallic silicon power, and mass mixing ratio is 1:3.5.The metal
Granularity≤45 μm of silicon powder, Si content > 98.5%.
The metallic aluminium powder, for the production of nitrogen atomization technique, fineness is≤74um.
SiC content >=98% in the carborundum powder carborundum powder, fineness are≤74um.
The dispersing agent is the mixture (polyacrylate: polycarboxylic acids: oxygen of polyacrylate, polycarboxylic acids, alumina powder etc.
Change aluminium powder mass ratio is 45:5:50), it is a kind of efficient composite water-reducing agent, there is splendid water-reducing property, while unsuitable bleeding,
There is good stability, avoids iron runner castable swelling cracking.
The air entraining agent is that the air entraining agent is C 12 A 7 (amorphous state), makes the metallic aluminium in iron runner castable
Powder generates hydrogen in advance, gets angry when iron runner castable does not generate solidification intensity and opens gas vent.
The explosion-proof fiber, for water-soluble explosion-proof fiber, fusing point is 90 DEG C, length is 5~3mm.
The nano carbon black is the N990R type of Penta Carbon company, Germany production.
Embodiment 1
A kind of long-life (master) iron runner castable, each component and its shared mass percent are as follows: by dense alumina 56%；Carbon
SiClx 0-1mm:11%；Ball pitch 3%；Pure calcium aluminate cement 2%；Alumina powder 12%；High-purity silicon dioxide micro mist 1%；
Carborundum powder 12.27%；Compound antioxidizer 2%；Nano carbon black 0.2%；Metallic aluminium powder 0.2%, explosion-proof fiber 0.1；Dispersion
Agent 0.2%；Air entraining agent 0.03%.Each raw material is weighed and is sufficiently mixed by said ratio；Adding water, (quality of water is each original
Expect the 3.7% of gross mass) vibration moulding after mixing evenly；After molding gained sample after spontaneously drying for 24 hours at 110 DEG C again into
For 24 hours, long-life (master) iron runner castable sample is made in row heat treatment.
Long-life obtained by the present embodiment (master) iron runner castable sample is subjected to performance detection, the results are shown in Table 1.
The method for testing performance of use is carried out according to existing national standards or professional standard, and gained testing result is 3 average detected knots
Fruit (the same below).
The performance test results of long-life (master) iron runner castable sample obtained by 1 embodiment 1 of table
Embodiment 2
A kind of long-life (master) iron runner castable, each component and its shared mass percent are as follows: by dense alumina 64%；Carbon
SiClx 0-1mm:5%；Ball pitch 2%；Pure calcium aluminate cement 1.5%；Alumina powder 10.55%；High-purity silicon dioxide micro mist
1.5%；Carborundum powder 13%；Compound antioxidizer 1.5%；Nano carbon black 0.6%；Metallic aluminium powder 0.15%, explosion-proof fiber
0.08；Dispersing agent 0.1%；Air entraining agent 0.02%.Each raw material is weighed and is sufficiently mixed by said ratio；Add water (water
Quality is the 3.6% of each total mass of raw material) vibration moulding after mixing evenly；After molding gained sample after spontaneously drying for 24 hours
It is heat-treated again at 110 DEG C for 24 hours, long-life (master) iron runner castable sample is made.
Long-life obtained by the present embodiment (master) iron runner castable sample is subjected to performance detection, the results are shown in Table 2.
The method for testing performance of use is carried out according to existing national standards or professional standard, and gained testing result is 3 average detected knots
Fruit (the same below).
The performance test results of long-life (master) iron runner castable sample obtained by 2 embodiment 2 of table
Embodiment 3
A kind of long-life (master) iron runner castable, each component and its shared mass percent are as follows: by dense alumina 59%；Carbon
SiClx 0-1mm:13%；Ball pitch 2.93%；Pure calcium aluminate cement 1.75%；Alumina powder 8%；High-purity silicon dioxide micro mist
2%；Carborundum powder 11%；Compound antioxidizer 1%；Nano carbon black 1%；Metallic aluminium powder 0.1%, explosion-proof fiber 0.06；Dispersion
Agent 0.15%；Air entraining agent 0.01%.Each raw material is weighed and is sufficiently mixed by said ratio；Adding water, (quality of water is each
The 3.6% of total mass of raw material) vibration moulding after mixing evenly；After molding gained sample after spontaneously drying for 24 hours at 110 DEG C again
It is heat-treated for 24 hours, long-life (master) iron runner castable sample is made.
Long-life obtained by the present embodiment (master) iron runner castable sample is subjected to performance detection, the results are shown in Table 3.
The method for testing performance of use is carried out according to existing national standards or professional standard, and gained testing result is 3 average detected knots
Fruit (the same below).
The performance test results of long-life (master) iron runner castable sample obtained by 3 embodiment 3 of table
Embodiment 4
A kind of long-life (master) iron runner castable, each component and its shared mass percent are as follows: by dense alumina 60%；Carbon
SiClx 0-1mm:9%；Ball pitch 2.5%；Pure calcium aluminate cement 2%；Alumina powder 10%；High-purity silicon dioxide micro mist 2%；
Carborundum powder 12%；Compound antioxidizer 1.98%；Nano carbon black 0.2%；Metallic aluminium powder 0.1%, explosion-proof fiber 0.06；Dispersion
Agent 0.15%；Air entraining agent 0.01%.Each raw material is weighed and is sufficiently mixed by said ratio；Adding water, (quality of water is each
The 3.6% of total mass of raw material) vibration moulding after mixing evenly；After molding gained sample after spontaneously drying for 24 hours at 110 DEG C again
It is heat-treated for 24 hours, long-life castable in main trough sample is made.
Long-life obtained by the present embodiment (master) iron runner castable sample is subjected to performance detection, the results are shown in Table 4.
The method for testing performance of use is carried out according to existing national standards or professional standard, and gained testing result is 3 average detected knots
Fruit (the same below).
The performance test results of long-life (master) iron runner castable sample obtained by 4 embodiment 4 of table
The above results show a kind of long-life (master) iron runner castable of the present invention, the low, compactness with amount of water
Good, long service life crosses the features such as iron is high.
Long-life of the present invention (master) iron runner castable is applied to Chengde Jianlong steel mill 1350m3 blast furnace main channel, as a result
Show that its using effect fully meets live requirement: the metallic aluminium powder in casting process in iron runner castable generates hydrogen in advance
Gas gets angry when castable does not generate solidification intensity and opens gas vent, and the safety of iron runner castable construction application is big
Amplitude improves, and castable is while meeting execution conditions with high compactness and excellent applied at elevated temperature performance, slag iron
The erosive velocity of castable in main trough is obviously slowed down, service life improves 30% or so.
Capital construction die size is widened into 150mm, depth down 80mm than periodical repair traditional dies.Using this bimodal manner
It is effective to reduce destruction of the ditch machine to tap drain when tearing ditch open, the portions such as bottom of trench when shortening and tear the ditch time open, and ensure that tap drain casting
There is enough casting thickness in position, utmostly ensure that the globality of each period tap drain casting, to ensure that tap drain works
The service life and safety and stability of lining.Using the program in the 1350 cubes of blast furnace capital construction applications of Chengde Jianlong special steel,
Tap drain is not repaired the service life disposably and is reached 6 months, crosses iron and reaches 330,000 tons；The periodical repair period was also increased to 5 by original 4 months
A month.
Obviously, above-described embodiment is only intended to clearly illustrate made example, and is not the limitation to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And the obvious variation or change therefore amplified
It moves within still in the protection scope of the invention.
Claims (10)
1. a kind of long-life iron runner castable, it is characterised in that composition is by mass percentage are as follows:
2. the construction method of long-life iron runner castable described in claim 1, comprising the following steps:
Capital construction mold and daily periodical repair mold will be stopped year using different sizes, guarantee 500mm in bottom of trench iron runner castable thickness
Under the premise of above, capital construction die size will be stopped year than daily periodical repair mold and widen 150mm, depth down 80mm.
3. long-life iron runner castable as described in claim 1, it is characterised in that the carborundum aggregate partial size is 0-1mm, SiC
Content >=98.5%, Fe2O3< 0.3wt%；Carborundum powder SiC content >=98%, fineness are≤74um.
4. long-life iron runner castable as described in claim 1, it is characterised in that the pure calcium aluminate cement is pure calcium aluminate 71
Cement.
5. long-life iron runner castable as described in claim 1, it is characterised in that the fineness of the alumina powder is micro- less than 1.2
Rice, purity are greater than 99.5%；Its main chemical compositions is Al2O3> 99.5wt%, Na2O < 0.1wt%.
6. long-life iron runner castable as described in claim 1, it is characterised in that the fine silica powder SiO2> 99wt%,
PH value is less than 4, and volume average particle size is less than 0.3 micron.
7. long-life iron runner castable as described in claim 1, it is characterised in that the compound antioxidizer be boron carbide powder and
The mixture of metallic silicon power, mass ratio 1:3.5；Granularity≤45 μm of the metallic silicon power.
8. long-life iron runner castable as described in claim 1, it is characterised in that the explosion-proof fiber is the explosion-proof fibre of Wei Nilun matter
Dimension, fusing point is 90 DEG C, length is 5~3mm.
9. long-life iron runner castable as described in claim 1, it is characterised in that the dispersing agent contains polyacrylate, poly- carboxylic
The mixture of acid, alumina powder；Wherein polyacrylate: polycarboxylic acids: the mass ratio of alumina powder is 45:5:50.
10. long-life iron runner castable as described in claim 1, it is characterised in that the air entraining agent is seven aluminic acid ten of amorphous state
Dicalcium.
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| CN113480294A (en) * | 2021-07-09 | 2021-10-08 | 中冶武汉冶金建筑研究院有限公司 | High-performance high-alumina iron runner castable |
| CN113526967A (en) * | 2021-07-09 | 2021-10-22 | 中冶武汉冶金建筑研究院有限公司 | Novel iron runner castable taking waste refractory as main material |
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| CN113480294A (en) * | 2021-07-09 | 2021-10-08 | 中冶武汉冶金建筑研究院有限公司 | High-performance high-alumina iron runner castable |
| CN113526967A (en) * | 2021-07-09 | 2021-10-22 | 中冶武汉冶金建筑研究院有限公司 | Novel iron runner castable taking waste refractory as main material |
| CN113526967B (en) * | 2021-07-09 | 2023-08-15 | 中冶武汉冶金建筑研究院有限公司 | Iron runner castable taking waste refractory as main material |
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