CN104355636B - A kind of RH stove dip pipe castable and preparation method thereof - Google Patents
A kind of RH stove dip pipe castable and preparation method thereof Download PDFInfo
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- CN104355636B CN104355636B CN201410606979.7A CN201410606979A CN104355636B CN 104355636 B CN104355636 B CN 104355636B CN 201410606979 A CN201410606979 A CN 201410606979A CN 104355636 B CN104355636 B CN 104355636B
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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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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Abstract
The present invention relates to a kind of RH stove dip pipe castable and preparation method thereof, its constitutive material components by weight percentage is: primary raw material: useless pink fused alumina-spinelle ramming mass 5～55%, corundum 30～80%, active alpha-alumina 2～8%, CL370 powder 2～8%, aluminous cement 1～9%, additional raw material: water reducer 0.2～1.2%, steel fibre 0.5～3%, explosion-proof fiber 0.01～0.2%, preparation method is material processed, batching, batch mixing and moulding. pink fused alumina-spinelle ramming mass in the present invention is mainly by corundum, aluminum-spinel, chromium oxide composition, corundum has good high volume stability and anti-metal bath aggressivity, aluminum-spinel has outside good properties at high temperature and good thermal-shock resistance and corrosion resistance, chromium oxide has good erosion-resisting characteristics, therefore pink fused alumina-spinelle ramming mass is introduced to castable as part batching, not only fine anti-erosion and the thermal shock resistance that has solved castable, improve the service life of RH stove dip pipe, and turn waste into wealth, economize on resources, be conducive to enterprise's cost efficiency.
Description
Technical field
The present invention relates to technical field of refractory materials, particularly a kind of RH stove dip pipe castable and system thereofPreparation Method.
Background technology
RH refining furnace is the visual plant of steel-making, is the molten steel refining technology equipment for the production of high-quality steel. ?In RH refining furnace, the working environment of dip pipe is the most severe, is that RH stove suffers to corrode the most serious position, thisMainly because the inwall of dip pipe directly contacts with molten steel, washed away by high velocity air and steel treatment afterThe stress impact of suddenly cold and hot, simultaneously the outer wall of dip pipe directly contacts with slag again and same to be subject to quenching rapidThe stress impact of heat. Dip pipe seriously causes its service life non-because the castable at dip pipe place suffers to corrodeOften short, thus so also cause RH stove inner vacuum chamber suddenly cold and hot with regard to the replacing number of times that can increase undoubtedly dip pipeIncreasing of number of times, has shortened service life of RH stove middle part, polycrystalline substance, and visible, RH stove dip pipe is to makeThe key link in about RH stove life-span, the service life of therefore improving RH stove dip pipe is most important.
From elaboration above, the erosion to castable of high-temperature molten steel and slag and souring, temperature waveBetween the moving thermal spalling causing and structure spalling, the each material of dip pipe, the difference of hot expansibility is to cause castableThe main cause of damage, therefore will improve the service life of RH stove dip pipe and will improve the cast of RH stove dip pipeAnti-erosion and the thermal shock resistance of material. It is current in order to improve anti-erosion and the thermal shock resistance of RH stove dip pipe castable,General employing burnt till magnesite-chrome brick as castable, and still, traditional magnesite-chrome brick production of articles cycle of burning till is long,Energy consumption is high, also can cause the pollution of environment in use; And alkali resistance slag weak effect, easily peel off.
In order to address the above problem, to the present invention proposes one and can improve dip pipe castable anti-erosion and heat resistanceheat resistantRH stove dip pipe castable that shock stability and cost are low and preparation method thereof.
Summary of the invention
The present invention has overcome above-mentioned the deficiencies in the prior art, provides a kind of and can improve dip pipe castMaterial anti-erosion and thermal shock resistance and cheaply RH stove dip pipe castable and preparation method thereof.
Technical scheme of the present invention is achieved in that
A kind of RH stove dip pipe castable, the constitutive material components by weight percentage of this castable is:
Described useless pink fused alumina-spinelle ramming mass is made up of corundum, aluminum-spinel and chromium oxide, and uselessPercentage by weight >=20% of the aluminum-spinel in pink fused alumina-spinelle ramming mass, the weight percent of chromium oxideThan >=3%; And the granularmetric composition of useless pink fused alumina-spinelle ramming mass be 12～8mm, 8～5mm, 5～3mm,3～1mm, 1～0.088mm, six kinds of specifications of < 0.088mm.
Pink fused alumina-spinelle ramming mass is mainly by corundum, aluminum-spinel, 3 kinds of thing phase compositions of chromium oxide, itsMiddle corundum has good high volume stability and anti-metal bath aggressivity, and aluminum-spinel not only hasGood properties at high temperature also has good thermal-shock resistance and corrosion resistance outward, and chromium oxide also has well anti-Erosion performance, therefore introduces pink fused alumina-spinelle ramming mass in castable as part batching, not only fineSolve anti-erosion and the thermal shock resistance of castable, improved the service life of RH stove dip pipe, Er QiebianGive up as treasured, economize on resources, be conducive to enterprise's cost efficiency; It is steady that active alpha-alumina has higher chemistryQualitative, there is the large feature of acid-fast alkali-proof mechanical strength; Aluminous cement is bonding agent, and the knot of castable is providedClose intensity; Steel fibre is in order to increase castable rupture strength; Explosion-proof fiber is in order to increase product gas permeability, energyEnough prevent bursting of castable, thermal shock resistance that can more effective enhancing castable. Described water reducer subtractsFew amount of water, reducing the porosity and being exactly in addition increases the pouring material dispersiveness stirring that adds water. Described explosion-proof fibreWesy is to increase toast spatter-proof performance. Wherein, described water reducer, steel fibre and explosion-proof fiber are all additionalAgent, the consumption size of additive is along with climate temperature changes and corresponding change.
As preferably, the corundum in described raw material composition is fused white corundum, sub-white corundum and plate diamond sparComposition; And corundum granularmetric composition is 12～8mm 15%, 8～5mm 20%, 5～3mm 20%,3～1mm 15%, 1～0.5mm 5%, 0.5～0.088mm 10%, < 0.088mm 15% 7Plant specification; The Al wherein containing in corundum2O3Percentage by weight >=98.5%.
As preferably, described water reducer is one or more arbitrary proportions in FDN, ADS and ADWMixing.
FDN is high efficiency composition water reducer, and main component is beta-naphthalenesulfonic-acid formaldehyde condensation compound, and its water-reducing rate is high,Can increase substantially the intensity of castable; Dispersed alumina ADS and ADW can be widely used in corundum castIn material and goods.
A preparation method for RH stove dip pipe castable, comprises the following steps:
(1) system material: bulk is given up to pink fused alumina-spinelle ramming mass after selection and surperficial scarfing cinder processing, then comply withInferior process jaw crusher, oppositely rolling roller crusher, cone crusher carry out Mechanical Crushing, soAfter send into ball mill and carry out fine grinding, then after screen cloth screening, make granularity be respectively 12～8mm,The classification material of 8～5mm, 5～3mm, 3～1mm, 1～0.088mm, six kinds of specifications of < 0.088mm;
(2) batching: according to the proportion relation of described each constitutive material, the useless chromium after configuration process is firm respectivelyJade-spinelle ramming mass, corundum, active alpha-alumina, CL370 powder, aluminous cement,Water reducer, steel fibre, explosion-proof fiber, be prepared into siccative semi-finished product;
(3) batch mixing: the raw material preparing is sent into batch mixer, until mix;
(4) moulding: add water in the raw material after mixing, amount of water is compound total amount percentage by weight3～7%, wherein time >=5 minute of batch mixing; Adopt vibrating head to insert vibration moulding simultaneously.
Wherein said jaw crusher is coarse crushing, and pair roller type is fine crushing, circular cone type be again thin brokenBroken; Adopt vibrating head to insert vibration moulding, be beneficial to exhaust. This castable preparation method technique is simpleCost is low.
Adopt the invention has the beneficial effects as follows of technique scheme:
The present invention relates to one and can improve dip pipe castable anti-erosion and thermal shock resistance and RH stove cheaplyDip pipe castable and preparation method thereof. The present invention mainly adopts the pink fused alumina-spinelle after intermediate frequency furnace is usedRamming mass carries out after processing as reworked material, and pink fused alumina-spinelle ramming mass is mainly by corundum, magnalium pointSpar, 3 kinds of thing phase compositions of chromium oxide, wherein corundum has good high volume stability and anti-metal bathAggressivity, aluminum-spinel not only has good properties at high temperature and also has good thermal-shock resistance and anti-invading outwardErosion property, chromium oxide also has good erosion-resisting characteristics, therefore using pink fused alumina-spinelle ramming mass as partBatching is introduced in castable, and not only fine anti-erosion and the thermal shock resistance that has solved castable, has improved RHThe service life of stove dip pipe, and turn waste into wealth, economize on resources, be conducive to enterprise's cost efficiency.
Detailed description of the invention
The specific embodiment of the present invention is as follows:
Embodiment 1: a kind of RH stove dip pipe castable, the constitutive material of this castable is joined by weight percentageThan being:
Wherein water reducer is the mixing of ADS and ADW, and its mass percent is respectively 0.2% and 0.5%;Described water reducer, steel fibre and the equal additive of explosion-proof fiber, the consumption size of additive is total up to 2.58%.
Specifically, described useless pink fused alumina-spinelle ramming mass is by corundum, aluminum-spinel and chromium oxideComposition, and the percentage by weight 20% of aluminum-spinel in useless pink fused alumina-spinelle ramming mass, chromium oxidePercentage by weight 3%; And the granularmetric composition of useless pink fused alumina-spinelle ramming mass be 12～8mm, 8～5mm,5～3mm, 3～1mm, 1～0.088mm, six kinds of specifications of < 0.088mm.
Described corundum is fused white corundum, sub-white corundum and plate diamond spar composition; And corundum granularmetric composition is12～8mm 15%, 8～5mm 20%, 5～3mm 20%, 3～1mm 15%, 1～0.5mm5%, 0.5～0.088mm 10%, 15% 7 kind of specification of < 0.088mm; Wherein in corundum, containAl2O3Percentage by weight 98.5%.
A preparation method for RH stove dip pipe castable, comprises the following steps:
(1) system material: bulk is given up to pink fused alumina-spinelle ramming mass after selection and surperficial scarfing cinder processing, then comply withInferior process jaw crusher, oppositely rolling roller crusher, cone crusher carry out Mechanical Crushing, then send intoBall mill carries out fine grinding, then through after screen cloth screening, make granularity be respectively 12～8mm, 8～5mm,The classification material of 5～3mm, 3～1mm, 1～0.088mm, six kinds of specifications of < 0.088mm;
(2) batching: according to the proportion relation of described each constitutive material, the useless chromium after configuration process is firm respectivelyJade-spinelle ramming mass, corundum, active alpha-alumina, CL370 powder, aluminous cement, diminishingAgent, steel fibre, explosion-proof fiber, be prepared into siccative semi-finished product;
(3) batch mixing: the material preparing is sent into batch mixer, until mix;
(4) moulding: it is compound total amount percentage by weight that the raw material China and foreign countries after mixing add water, amount of water5.4%, the wherein 8 minutes time of batch mixing; Adopt vibrating head to insert vibration moulding simultaneously.
Adopt the index of the prepared castable of embodiment 1 to be:
| Index | Embodiment 1 |
| Scouring index (basicity=2.9) | 7.5 |
| Thermal shock resistance/time (1100 DEG C, water-cooled) | 9 |
Embodiment 2: a kind of RH stove dip pipe castable, the constitutive material of this castable is joined by weight percentageThan being:
Described water reducer is FAN; Described water reducer, steel fibre and the equal additive of explosion-proof fiber, outerThe consumption size that adds agent is total up to 3.2%.
Specifically, described useless pink fused alumina-spinelle ramming mass is by corundum, aluminum-spinel and chromium oxideComposition, and the percentage by weight 20% of aluminum-spinel in useless pink fused alumina-spinelle ramming mass, chromium oxide weightAmount percentage 3%; And the granularmetric composition of useless pink fused alumina-spinelle ramming mass be 12～8mm, 8～5mm, 5～3mm,3～1mm, 1～0.088mm, six kinds of specifications of < 0.088mm.
Described corundum is fused white corundum, sub-white corundum and plate diamond spar composition; And corundum granularmetric composition is12～8mm 15%, 8～5mm 20%, 5～3mm 20%, 3～1mm 15%, 1～0.5mm5%, 0.5～0.088mm 10%, 15% 7 kind of specification of < 0.088mm; Wherein in corundum, containAl2O3Percentage by weight 98.5%.
A preparation method for RH stove dip pipe castable, is characterized in that comprising the following steps:
(1) system material: bulk is given up to pink fused alumina-spinelle ramming mass after selection and surperficial scarfing cinder processing, then comply withInferior process jaw crusher, oppositely rolling roller crusher, cone crusher carry out Mechanical Crushing, then send intoBall mill carries out fine grinding, then through after screen cloth screening, make granularity be respectively 12～8mm, 8～5mm,The classification material of 5～3mm, 3～1mm, 1～0.088mm, six kinds of specifications of < 0.088mm;
(2) batching: according to the proportion relation of described each constitutive material, the useless chromium after configuration process is firm respectivelyJade-spinelle ramming mass, corundum, active alpha-alumina, CL370 powder, aluminous cement, diminishingAgent, steel fibre, explosion-proof fiber, be prepared into siccative semi-finished product;
(3) batch mixing: the material preparing is sent into batch mixer, until mix;
(4) moulding: add water in the raw material after mixing, amount of water is compound total amount percentage by weight5.2%, the wherein 8 minutes time of batch mixing; Adopt vibrating head to insert vibration moulding simultaneously.
Adopt the index of the prepared castable of embodiment 2 to be:
| Index | Embodiment 2 |
| Scouring index (basicity=2.9) | 4.8 |
| Thermal shock resistance/time (1100 DEG C, water-cooled) | 11 |
Scouring index: finished product is made to the bar-shaped sample of 40*40*160, adopted revolution anti-slag method by sampleIn 1650 DEG C of rotary furnaces and be incubated 2 hours; Lateral dissection sample section, the scouring index of test samples;Each formula needs 3 samples, and averages.
Thermal shock resistance: high temperature furnace is preheated to 1100 ± 10 DEG C and be incubated after 15min, rapidly sample is moved toIn burner hearth, after insulation 20min, rapidly sample is immersed in 5～35 DEG C of circulating waters, sharply after cooling 3minTake out immediately, in air, be no less than 5min standing time. Then sample is put into stove again, repeatState process, until large crackle appears in sample, till can not continuing experiment, record experiment number. Each is joinedSide needs 3 samples, and averages.
Claims (4)
1. a RH stove dip pipe castable, is characterized in that: the constitutive material of this castable percentage by weightMatch well than being:
Described useless pink fused alumina-spinelle ramming mass is made up of corundum, aluminum-spinel and chromium oxide, and uselessPercentage by weight >=20% of aluminum-spinel in pink fused alumina-spinelle ramming mass, the weight hundred of chromium oxideProportion by subtraction >=3%; And the granularmetric composition of useless pink fused alumina-spinelle ramming mass be 12～8mm, 8～5mm,5～3mm, 3～1mm, 1～0.088mm, six kinds of specifications of < 0.088mm.
2. a kind of RH stove dip pipe castable according to claim 1, is characterized in that: described is formerCorundum in material composition is fused white corundum, sub-white corundum and plate diamond spar composition; And corundum granularity groupBecome 12～8mm 15%, 8～5mm 20%, 5～3mm 20%, 3～1mm 15%,1～0.5mm 5%, 0.5～0.088mm 10%, 15% 7 kind of specification of < 0.088mm; ItsThe Al containing in middle corundum2O3Percentage by weight >=98.5%.
3. a kind of RH stove dip pipe castable according to claim 1, is characterized in that: described subtractsAqua is the mixing of one or more arbitrary proportions in FDN, ADS and ADW.
4. the preparation method based on RH stove dip pipe castable as claimed in claim 1, its feature existsIn comprising the following steps:
(1) system material: bulk is given up to pink fused alumina-spinelle ramming mass after selection and surperficial scarfing cinder processing, then comply withInferior process jaw crusher, oppositely rolling roller crusher, cone crusher carry out Mechanical Crushing, soAfter send into ball mill and carry out fine grinding, then after screen cloth screening, make granularity be respectively 12～8mm,The classification material of 8～5mm, 5～3mm, 3～1mm, 1～0.088mm, six kinds of specifications of < 0.088mm;
(2) batching: according to the proportion relation of described constitutive material, the useless pink fused alumina after configuration process respectively-Spinelle ramming mass, corundum, active alpha-alumina, CL370 powder, aluminous cement, subtractAqua, steel fibre, explosion-proof fiber, be prepared into siccative semi-finished product;
(3) batch mixing: the raw material preparing is sent into batch mixer, until mix;
(4) moulding: add water in the raw material after mixing, amount of water is compound total amount percentage by weight3～7%, wherein time >=5 minute of batch mixing; Adopt vibrating head to insert vibration moulding simultaneously.
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| CN106927838B (en) * | 2017-02-17 | 2020-04-17 | 北京兰海金诚耐火材料有限责任公司 | Steel fiber reinforced wear-resistant explosion-proof castable |
| CN111362674B (en) * | 2020-03-19 | 2022-05-13 | 上海彭浦特种耐火材料厂有限公司 | Acid-resistant corundum ramming mass and method for manufacturing acid regenerator nozzle by using same |
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| CN114480787B (en) * | 2022-01-20 | 2023-07-07 | 鞍山市和丰耐火材料有限公司 | Filling process between dip pipes |
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| CN1296324C (en) * | 2005-04-08 | 2007-01-24 | 上海彭浦特种耐火材料厂 | Improved type casting material based on bauxite for middle-small type ladle and preparation method |
| CN103274710B (en) * | 2013-06-17 | 2014-11-26 | 武汉钢铁(集团)公司 | Al2o3-Mgo-Cr2o3 casting material for insert tube of RH vacuum furnace |
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