CN106565254A - Refractory castable for producing air blowing assisted slagging-off spray gun - Google Patents
Refractory castable for producing air blowing assisted slagging-off spray gun Download PDFInfo
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- CN106565254A CN106565254A CN201610946970.XA CN201610946970A CN106565254A CN 106565254 A CN106565254 A CN 106565254A CN 201610946970 A CN201610946970 A CN 201610946970A CN 106565254 A CN106565254 A CN 106565254A
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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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Abstract
The invention discloses a refractory castable for producing an air blowing assisted slagging-off spray gun. The refractory castable includes, by weight, 40-60 parts of electric-smelting pure mullite, 15-30 parts of andalusite, 1-9 parts of aluminum oxide hollow spheres, 1-4 parts of silicon carbide, 5-10 parts of compact corundum fine powder, 5-10 parts of [alpha]-Al2O3 micro powder, 2-5 parts of silicon micro powder, 3-6 parts of pure calcium aluminate cement, and 1-5 parts of heat-resistant steel fibers. In the heavy castable, a proper amount of the aluminum oxide hollow spheres having proper diameters is introduced, so that the construction flowability of the castable is greatly improved, porosity ratio of the castable is reduced, volume density is increased and compactness of the castable is increased since the spherical shape of the hollow spheres has advantages on flowing of the castable slurry, thereby improving mechanical performance and anti-slagging performance of spray gun lining. The flexural strength of the castable is increased by 20% than that of a common castable while compression strength is increased by 45%.
Description
Technical field
The present invention relates to Refractory for Hot Metal Pretreatment field before pneumatic steelmaking, blows in particular to a kind of for preparing
Auxiliary is skimmed the castable refractory of spray gun.
Background technology
After desulfurizing iron, the substantial amounts of desulfurization slag of molten iron surface flotation in hot-metal bottle, in order to avoid harmful element is returned in slag
Returning molten iron affects the cleanliness factor and product quality of high added value steel grade, it is necessary to take effective means to remove in these dregs.Cause
And, molten iron drossing is one of key technology of Cleanliness of Molten Steel control, is also that clean steel is efficient, stable, inexpensive extensive raw
The indispensable means of product.
At present, the hot-metal bottle for generally adopting both at home and abroad skims mode for mechanical slagging-off method, i.e., first by hot-metal bottle tipping to taking off
Slag operating position, by reciprocal before and after slag removal device and left and right movement in a curve, molten iron level scum silica frost is removed, but due to hot-metal bottle after
Wall zone is difficult to touch, and forms dead band of skimming, and causes the deficiencies such as efficiency is low, iron loss is high, time sulfur control difficulty of skimming.For this purpose, state
Inside and outside scholar is skimmed for the purpose of efficiency by improving traditional mechanical, is developed various hot-metal bottles and is blown auxiliary slag skimming process, and in reality
The excellent results for shortening slag-removing time are achieved in the production of border.Wherein, top gun blows auxiliary slag skimming process with its enforcement facility, behaviour
Control flexibly, without the advantages of oozing iron winds danger obtains iron and steel enterprise's favor；Its specific embodiment is：After hot-metal bottle is inclined, will push up
Rifle is blowed and sprayed along hot-metal bottle rear wall insertion molten iron depths, by being blown noble gases, is floated by the expansion of blowing gas, drive ferrum
Water level desulfurization slag to tank mouth is assembled, so as to facilitate Cinder Machine to operate.From above-mentioned technical process, top-blown spray gun is that air blowing is auxiliary
The key equipment of slag skimming process is helped, its service life is not only related to iron and steel enterprise's production cost, and influences whether work of skimming
The direct motion of sequence and production efficiency.
In actual production, due to Service Environment it is severe, air blowing auxiliary skim pipette tips during spray gun use wear and tear, come off,
Body of a gun crackle is peeled off and phenomenon of rupture is serious, causes average life to be only 15-20 time/, changes frequent, causes molten iron pre-
The treatment process production time extends, and have impact on working performance, increased labor strength.However, due to lance insertion
Depth is little, the restriction of single function and spray gun driving means mounting arrangement and investment, and top-blown spray gun yardstick is little, lightweight, valency
Lattice are low, simple structure, lift poly- slag effect side for the research of top-blown spray gun is concentrated mainly on optimization spray gun spout structure at present
Face, the such as a kind of " air blow gun (Authorization Notice No. of assisting slagging-off for molten iron：CN202006279U) ", " air blowing of assisting slagging-off for molten iron
Poly- slag spray gun and its using method (application publication number：CN 103114177A) ", " poly- slag of breathing freely with top plug-in type spray gun and its
The patents such as preparation method (application publication number " A of CN 104164535) " propose novel jet nozzle structure, to strengthen blast pass
Drive slag effect, reduce air-flow hot-metal bottle tank skin is washed away.It is at present, less for the aspect research of spray gun service life is extended,
Only several then patent reports, Chinese patent " for the air blow gun of blowing slag-removing " notification number CN201778055U, by external
Arrange the double-layered protecting structure of inner protective layer and external protection outside source of the gas steel pipe to improve the service life of air blow gun, wherein interior
Protective layer adopts commercially available lightening casting material, external protection to adopt commercially available high-strength castable.Chinese patent " is used for molten iron blowing slag-removing
Air blow gun " notification number CN201793624U, disclose a kind of top-blown spray gun, its refractory casting bed of material includes reinforcement, not
Reinforcement, reinforcement is resistance to using what is thickeied by the part in top-blown spray gun operation, contacting with molten iron near outlet side
The fire cast bed of material so as to higher-strength, to improve its service life.
As the above analysis, the key equipment that top-blown spray gun is skimmed as auxiliary of blowing, at present for raising, it is used
Life search is less, is not also targetedly developed especially for spray gun rifle lining refractories, cause service life compared with
It is short, safeguard and change frequent, hot metal pre process procedures production efficiency is reduced, increased labor strength.
The content of the invention
It is an object of the invention to provide a kind of skim the castable refractory of spray gun for preparing auxiliary of blowing, the fire resisting is poured
The characteristics of material feeding has function admirable, with low cost, raw material sources are wide, it can meet air blowing auxiliary and skim bad working environments condition
The performance of lower lance rifle lining refractories requires that compared with lance prepared by normal pouring material, the present invention is poured
Top-blown spray gun average life prepared by material feeding can improve more than 15 times/.
For achieving the above object, the castable refractory of a kind of spray gun of skimming for preparation air blowing auxiliary that the present invention is provided,
The raw materials by weight portion of the castable refractory includes the pure mullite of 40～60 parts of electric smelting, 15～30 parts of red post than meter
Stone, 1～9 part of alumina hollow ball, 1～4 part of carborundum, 5～10 parts of dense alumina fine powder, 5～10 parts of а-Al2O3
Micropowder, 2～5 parts of silicon powder, 3～6 parts of pure calcium aluminate cement and 1～5 part of heat-resistant steel fiber.
Further, the raw materials by weight portion of the castable refractory also includes 0.05～0.2 part of trimerization phosphorus than meter
Sour sodium and 0.05～0.2 part of water reducer.
Yet further, the particle diameter of the pure mullite of the electric smelting be 0.15～5mm, andalusite particle diameter be 0.15～3mm,
The particle diameter of alumina hollow ball be 0.5～1mm, the particle diameter of carborundum be 0.15～1mm, the particle diameter of dense alumina fine powder be 325
Mesh.
Yet further, the pure mullite of the electric smelting is divided into by size：3mm ＜ particle diameters≤5mm, 1mm ＜ particle diameters≤
3mm, 0.045 ＜ particle diameters≤1mm and 0 ＜ particle diameters≤levels of 0.045mm tetra- are matched somebody with somebody, and its percentage by weight is respectively：40～60%, 20
～40%, 0～20% and 10～30%.
Yet further, the andalusite is divided into by size：1mm ＜ particle diameters≤3mm and 0.15mm ＜ particle diameters≤1mm
Two levels are matched somebody with somebody；Its percentage by weight is respectively：10～50% and 50～90%.
Yet further, the raw materials by weight portion of the castable refractory includes than meter：
| The pure mullite of electric smelting of 3mm ＜ particle diameters≤5mm | 23～25 parts |
| The pure mullite of electric smelting of 1mm ＜ particle diameters≤3mm | 12～14 parts |
| The pure mullite of electric smelting of 0.045mm ＜ particle diameters≤1mm | 5～8 parts |
| The pure mullite of electric smelting of 0 ＜ particle diameters≤0.045mm | 5～8 parts |
| The andalusite of 1mm ＜ particle diameters≤3mm | 7～12 parts |
| The andalusite of 0.15mm ＜ particle diameters≤1mm | 11～16 parts |
| Alumina hollow ball | 2～8 parts |
| Carborundum | 1～4 part |
| Dense alumina fine powder | 5～10 parts |
| а-Al2O3Micropowder | 5～10 parts |
| Silicon powder | 2～5 parts |
| Pure calcium aluminate cement | 3～6 parts |
| Heat-resistant steel fiber | 1～5 part |
| Sodium tripolyphosphate | 0.05～0.2 part |
| Water reducer | 0.05～0.2 part |
Wherein, the particle diameter of alumina hollow ball be 0.5～1mm, the particle diameter of carborundum be that 0.15～1mm, dense alumina are thin
The particle diameter of powder is 325 mesh.
Yet further, the raw materials by weight portion of the castable refractory includes than meter：
| The pure mullite of electric smelting of 3mm ＜ particle diameters≤5mm | 24 parts |
| The pure mullite of electric smelting of 1mm ＜ particle diameters≤3mm | 12 parts |
| The pure mullite of electric smelting of 0.045 ＜ particle diameters≤1mm | 7 parts |
| The pure mullite of electric smelting of 0 ＜ particle diameters≤0.045mm | 7 parts |
| The andalusite of 1mm ＜ particle diameters≤3mm | 7 parts |
| The andalusite of 0.15mm ＜ particle diameters≤1mm | 14 parts |
| Alumina hollow ball | 4 parts |
| Carborundum | 2 parts |
| Dense alumina fine powder | 7 parts |
| а-Al2O3Micropowder | 5 parts |
| Silicon powder | 4 parts |
| Pure calcium aluminate cement | 5 parts |
| Heat-resistant steel fiber | 2 parts |
| Sodium tripolyphosphate | 0.1 part |
| Water reducer | 0.1 part |
Wherein, the particle diameter of alumina hollow ball be 0.5～1mm, the particle diameter of carborundum be that 0.15～1mm, dense alumina are thin
The particle diameter of powder is 325 mesh.
The design principle of the present invention
The present invention by domestic correlation iron and steel enterprise desulfurizing iron top gun blow auxiliary skim process Field Research and top
The scene tracking of rifle Breakage Processes is blowed and sprayed, the use functional requirement of top-blown spray gun is analyzed.Based on top-blown spray gun applying working condition bar
Part, architectural feature, material property feature and damaged condition are prepared, inquired into the Wear mechanism of spray gun.Think, top-blown spray gun
Coaxial lower air blowing, the sluggish floating of blowing gas stream stocks of Jet with downward flow direction kinetic energy, extends stopping for pipette tips nozzle area air-flow
The time is stayed, the molten iron heating and expansion of the zone gas flow stock is enhanced, erosive wear of the jet-stream wind to pipette tips is exacerbated；It is single
One injection stream stock blowing method stirring kinetic energy is concentrated, and water pile, concussion fluctuation, slag iron splash serious, cause spray gun jump with
Acutely swing, easily cause spray gun fatigue fracture；Top-blown spray gun metal gun core and fire proofed wood spray gun lining complex structure thermal stress are drawn
Play spray gun crackle to peel off, burn, rupture.As seen from the above analysis, rifle lining refractories thermal shock resistance can cause rifle to serve as a contrast Testudiniss
The main cause of peeling is split, comprehensive strength and the rigidity of spray gun are the main causes for causing spray gun bending, fractureing, and are further improved
The mechanical strength of top-blown spray gun rifle lining refractories, erosion-resisting characteristics, high-temperature behavior, thermal shock resistance energy and reduce spray gun gold
Category core can delay lance damage process, improve top-blown spray gun service life with rifle lining composition surface mechanical stress.
The present invention's specifically has the beneficial effect that：
(1) top-blown spray gun fire proofed wood spray gun lining mechanical property and slag resistance are improve.
The present invention by introducing the suitable appropriate alumina hollow ball of particle diameter in heavy castable material, due to hollow
The spherical shapes of ball are greatly improved castable construction mobility advantageously in the flowing of cast slip, reduce cast
The material porosity, improves bulk density, increased castable compactness.So as to improve rifle lining mechanical property and slag resistance,
Wherein, rupture strength improves 20% relative to normal pouring material, and compressive resistance improves 45%.
(2) top-blown spray gun fire proofed wood spray gun lining and metal gun core complex structure thermal stress are reduced.
By introducing hollow ball in castable, castable apparent porosity is reduced,
The heat conductivity of rifle lining is further increased, the thermograde during top-blown spray gun use is reduced, is alleviated
Because metal gun core and refractory material hot expansibility are mismatched, numerical simulation result shows, reduces top-blown spray gun complex knot
Structure thermal stress more than 10%；
(3) top-blown spray gun fire proofed wood spray gun lining high-temperature behavior and thermal shock resistance are improve.
By electronic microscope photos, 1400 DEG C × 3h of invention castable burn after in sample under the alumina hollow ball condition of high temperature with base
The SiO having more than needed around matter2Reaction, in hollow ball ball wall the secondary mullite network structure to matrix growth is generated, and is conducive to height
The raising of warm nature energy；Simultaneously as alumina hollow ball wall smoother, ties around the alumina hollow ball of introducing with substrate
Close position not tight, there is certain crackle, be conducive to hindering the extension of thermal shock crackle, the thermal shock resistance of castable can be improved
Can, water-cooled test result indicate that, the more conventional castable of sample thermal shock number of times improves more than 20%.
(4) by above-mentioned measure, compared with molten iron air blowing auxiliary prepared by normal pouring material skims top-blown spray gun, the present invention
Top-blown spray gun average life prepared by castable can improve more than 15 times/.
Specific embodiment
In order to preferably explain the present invention, the main contents of the present invention are further elucidated below in conjunction with specific embodiment, but
Present disclosure is not limited solely to following examples.
Embodiment 1
Molten iron the skim component of top-blown spray gun castable refractory 1 of auxiliary of blowing is by weight：
Cast is prepared for a collection of air blowing auxiliary and skims spray gun, and in certain steel mill contrast test has been carried out, and result of the test shows,
The auxiliary prepared using castable refractory 1 skims spray gun average life than conventional lance prolongation 15 times/.
Embodiment 2
Molten iron skim parts by weight of the component of top-blown spray gun castable refractory 2 of auxiliary of blowing are：
Cast is prepared for a collection of air blowing auxiliary and skims spray gun, and in certain steel mill contrast test has been carried out, and result of the test shows,
The auxiliary prepared using castable refractory 2 skims spray gun average life than conventional lance prolongation 10 times/.
Embodiment 3
Molten iron the skim percetage by weight of top-blown spray gun castable refractory component 3 of auxiliary of blowing is：
Cast is prepared for a collection of air blowing auxiliary and skims spray gun, and in certain steel mill contrast test has been carried out, and result of the test shows,
The auxiliary prepared using castable refractory 3 skims spray gun average life than conventional lance prolongation 5 times/.
Embodiment 4
Molten iron the skim percetage by weight of top-blown spray gun castable refractory component 4 of auxiliary of blowing is：
Cast is prepared for a collection of air blowing auxiliary and skims spray gun, and in certain steel mill contrast test has been carried out, and result of the test shows,
The auxiliary prepared using castable refractory 4 skims spray gun average life than conventional lance prolongation 25 times/.
Above-mentioned, it is that 0.15～1mm, dense alumina are thin that the particle diameter of alumina hollow ball is 0.5～1mm, the particle diameter of carborundum
The particle diameter of powder is 325 mesh, and the raw material such as FS20 water reducers can be purchased from market.
Other unspecified parts are prior art.Although above-described embodiment is made that to the present invention retouching in detail
State, but it is only a part of embodiment of the invention, rather than whole embodiments, people can with according to the present embodiment without
Other embodiment is obtained under the premise of creativeness, these embodiments belong to the scope of the present invention.
Claims (7)
- It is 1. a kind of to skim the castable refractory of spray gun for preparing auxiliary of blowing, it is characterised in that：The original of the castable refractory Material meter by ratio of weight and the number of copies includes 40～60 parts of the pure mullite of electric smelting, 15～30 parts of andalusite, 2～6 parts of aluminium oxide sky Bulbus cordis, 1～4 part of carborundum, 5～10 parts of dense alumina fine powder, 5～10 parts of а-Al2O3Micropowder, 2～5 parts of silicon powder, 3～6 parts of pure calcium aluminate cement and 1～5 part of heat-resistant steel fiber.
- 2. it is used to preparing auxiliary of blowing according to claim 1 to skim the castable refractory of spray gun, it is characterised in that：It is described resistance to Sodium tripolyphosphate and 0.05～0.2 part of diminishing of the raw materials by weight portion of fiery castable than meter also including 0.05～0.2 part Agent.
- 3. it is used to preparing auxiliary of blowing according to claim 2 to skim the castable refractory of spray gun, it is characterised in that：The electricity The particle diameter for melting pure mullite be 0.15～5mm, the particle diameter of andalusite be 0.15～3mm, the particle diameter of alumina hollow ball be 0.5～ 1mm, the particle diameter of carborundum be 0.15～1mm, dense alumina fine powder particle diameter be 325 mesh.
- 4. it is used to preparing auxiliary of blowing according to claim 3 to skim the castable refractory of spray gun, it is characterised in that：The electricity Melt pure mullite to be divided into by size：3mm ＜ particle diameters≤5mm, 1mm ＜ particle diameters≤3mm, 0.045mm ＜ particle diameters≤1mm and 0 ＜ particle diameters≤levels of 0.045mm tri- are matched somebody with somebody, and its percentage by weight is respectively：40～60%, 20～40%, 0～20% and 10～ 30%.
- 5. it is used to preparing auxiliary of blowing according to claim 3 to skim the castable refractory of spray gun, it is characterised in that：It is described red Pillar is divided into by size：1mm ＜ particle diameters≤3mm and 0.15mm ＜ particle diameters≤levels of 1mm bis- are matched somebody with somebody；Its percentage by weight difference For：10～50% and 50～90%.
- 6. it is used to prepare auxiliary of blowing according to claim 4 or 5 to skim the castable refractory of spray gun, it is characterised in that：Institute State the raw materials by weight portion of castable refractory includes than meter：
The pure mullite of electric smelting of 3mm ＜ particle diameters≤5mm 23～25 parts The pure mullite of electric smelting of 1mm ＜ particle diameters≤3mm 12～14 parts The pure mullite of electric smelting of 0.045mm ＜ particle diameters≤1mm 5～8 parts The pure mullite of electric smelting of 0 ＜ particle diameters≤0.045mm 5～8 parts The andalusite of 1mm ＜ particle diameters≤3mm 7～12 parts The andalusite of 0.15mm ＜ particle diameters≤1mm 11～16 parts Alumina hollow ball 2～8 parts Carborundum 1～4 part Dense alumina fine powder 5～10 parts а-Al2O3Micropowder 5～10 parts Silicon powder 2～5 parts Pure calcium aluminate cement 3～6 parts Heat-resistant steel fiber 1～5 part Sodium tripolyphosphate 0.05～0.2 part Water reducer 0.05～0.2 part Wherein, the particle diameter of alumina hollow ball be 0.5～1mm, the particle diameter of carborundum be 0.15～1mm, dense alumina fine powder Particle diameter is 325 mesh. - 7. it is used to preparing auxiliary of blowing according to claim 6 to skim the castable refractory of spray gun, it is characterised in that：It is described resistance to The raw materials by weight portion of fiery castable includes than meterWherein, the particle diameter of alumina hollow ball be 0.5～1mm, the particle diameter of carborundum be 0.15～1mm, dense alumina fine powder Particle diameter is 325 mesh.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107141002A (en) * | 2017-06-05 | 2017-09-08 | 武汉钢铁有限公司 | Composite fibre for desulfurization agitator strengthens castable refractory |
| CN108059448A (en) * | 2018-02-13 | 2018-05-22 | 湖南镭目科技有限公司 | A kind of fire-resistant gravity flow pouring material |
| CN109676121A (en) * | 2019-01-31 | 2019-04-26 | 武汉钢铁有限公司 | The high-effect slag removal device of molten iron drossing |
| CN110981500A (en) * | 2019-12-16 | 2020-04-10 | 安徽工业大学 | Alumina hollow sphere and molten iron pretreatment spray gun refractory castable reinforcing and toughening method |
| CN112897999A (en) * | 2021-01-27 | 2021-06-04 | 湖南华菱涟源钢铁有限公司 | Castable for ladle slag-off plate, ladle slag-off plate and preparation method thereof |
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| CN112897999A (en) * | 2021-01-27 | 2021-06-04 | 湖南华菱涟源钢铁有限公司 | Castable for ladle slag-off plate, ladle slag-off plate and preparation method thereof |
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