CN105367099B - Environment protective leakage-resisting formula RH refining furnace dip pipe inner cores - Google Patents

Environment protective leakage-resisting formula RH refining furnace dip pipe inner cores Download PDF

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CN105367099B
CN105367099B CN201510926182.XA CN201510926182A CN105367099B CN 105367099 B CN105367099 B CN 105367099B CN 201510926182 A CN201510926182 A CN 201510926182A CN 105367099 B CN105367099 B CN 105367099B
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particle diameter
aggregate
dip pipe
magnesium
mgo
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CN105367099A (en
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洪学勤
王志强
雷中兴
田先明
彭肖仟
刘锋
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Wuhan Iron and Steel Group Corp
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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
    • 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
    • C04B28/005—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 gelatineous or gel forming binders, e.g. gelatineous Al(OH)3, sol-gel binders
    • 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
    • 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
    • C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • Ceramic Products (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a kind of environment protective leakage-resisting formula RH refining furnace dip pipe inner cores, are arranged on the inside of the steel courage body of the dip pipe in tubular construction, form inner core flame retardant coating using preform structure or integrated poured structure, wherein each component percentage by weight is：Magnesia aggregate：45~60%；Magnesium-rich spinel aggregate：15~25%；Mixing fine powders：15~25%；Micro mist：5~10%；Bonding agent：3~7%；Water reducer：0.1~0.5%；Organic explosion-proof fiber：0.05~0.15%.It is of the invention to substitute traditional magnesite-chrome brick as dip pipe inner core using magnesia Zirconium spinel matter prefabricated component or by the way of integrated poured, magnesite-chrome brick inner core is effectively prevent in use because brickwork joint is easily etched and the defect that come off caused by molten steel and gas percussion, drastically increase safety in utilization and the life-span of dip pipe, the Cr VI avoided simultaneously in magnesite-chrome brick causes environmental pollution, endangers the problem of health of human body, the complicated procedures of forming of magnesite-chrome brick in traditional handicraft is it also avoid, production efficiency is drastically increased, reduces manufacturing cost.

Description

Environment protective leakage-resisting formula RH refining furnace dip pipe inner cores
Technical field
The present invention relates to Refractory For Steelmaking technical field, in particular to a kind of environment protective leakage-resisting formula RH refining furnace dip pipes Inner core.
Background technology
RH refining furnaces are that one of indispensable visual plant of high quality steel is produced during external refining.Dip pipe is made To pass in and out the passage of molten steel in RH refining furnaces, subject that molten steel washes away at a high speed, extremely cold very hot and slag violent erosion etc. is made With, be restrict RH refining furnace li` key link.
The internal layer of traditional RH dip pipes is mainly built by laying bricks or stones using leaching salt electric smelting recombined magnesia-chrome brick layering, and this structure is present Problems with：1) Cr VI in magnesite-chrome brick can all cause environmental pollution in the production and use process, endanger health of human body；2) Magnesite-chrome brick usually requires to undergo material mixing, molding, high-temperature calcination, punches, invades salt, polishing, assembling, the overall process such as polish again, system Overall inner core into dip pipe is assembled with box hat again, finally constructs amorphous refractory and dip pipe product is made.It is given birth to Production process is put into operating procedure complexity, and the production cycle is longer, and production efficiency is low；3) magnesite-chrome brick inner core in use due to There is gap between brick and brick, be easily etched and because being come off the percussion of molten steel and gas, or even cause to wear the danger of steel.
Publication No. CN202786321U Chinese utility model patent discloses a kind of RH refining furnaces dip pipe, although in it The prefabricated component that core is prepared using corundum spinelle cement-free castable overcomes the problems of above-mentioned magnesite-chrome brick, but it is not Provide specific preparation scheme.
The content of the invention
It is an object of the invention to provide a kind of environment protective leakage-resisting formula RH refining furnace dip pipe inner cores, its is environment friendly and pollution-free, can Avoid the gas leakage of brickwork joint bleed-out, service life high, and with the excellent performance of flushing of resistance to molten steel, good anti-scour property and good Good thermal shock resistance energy.
To achieve the above object, the environment protective leakage-resisting formula RH refining furnace dip pipe inner cores designed by the present invention, are arranged on the leaching On the inside of the steel courage body of stain pipe in tubular construction, inner core flame retardant coating is formed using preform structure or integrated poured structure, it is special Different part is：Each component percentage by weight is in the inner core flame retardant coating：
Wherein：Mixing fine powders are any for the fused magnesite of MgO weight content >=97%, magnesium-rich spinel and zirconium dioxide Scalemic thereof, its particle diameter≤0.088mm；Micro mist is SiO2The arbitrary proportion mixture of micro mist and active MgO micro mists, its particle diameter ≤10μm。
Further, the magnesia aggregate is the fused magnesite and MgO weight content >=97% of MgO weight content >=97% Magnesite clinker in one or two kinds of mixture, particle diameter≤12mm of the magnesia aggregate.
Yet further, the magnesia aggregate is divided into by particle size：8mm ＜ particle diameters≤12mm, 5mm ＜ particle diameter≤8mm, 3mm ＜ particle diameters≤5mm, the 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤gradings of 1mm five；Each level is fitted in magnesia aggregate Percentage by weight is followed successively by：13~17%, 28~32%, 18~22%, 18~22% and 13~15%.
Further, in the magnesium-rich spinel aggregate, MgO weight contents are 28~33%, Al2O3Weight content is 65 ~70%, particle diameter≤5mm of the magnesium-rich spinel aggregate.
Yet further, the magnesium-rich spinel aggregate is divided into by particle size：3mm ＜ particle diameters≤5mm, 1mm ＜ particle diameters ≤ 3mm the and 0mm ＜ particle diameters≤gradings of 1mm tri-；The percentage by weight that each level is fitted in magnesium-rich spinel aggregate is followed successively by：36 ~44%, 28~32% and 28~32%.
Further, in the mixing fine powders, the mixed proportion of fused magnesite, magnesium-rich spinel and zirconium dioxide is 1.5 ~2.5: 0.5~1.5: 0.5~1.5.
Further, in the micro mist, SiO2The mixed proportion of micro mist and active MgO micro mists is 1: 4~6.
Yet further, the SiO2In micro mist, SiO2Weight content >=96%, particle diameter≤5 μm；The active MgO micro mists In, MgO weight content >=96%, particle diameter≤2 μm.
Further, the bonding agent is that one or both of pure calcium aluminate cement, hydrated alumina, Ludox are any The mixture of ratio.
Further, the water reducer is sodium tripolyphosphate, calgon, one kind in polycarboxylic acids dehydragent or several The mixture of kind arbitrary proportion.
The advantage of the invention is that：Using magnesia Zirconium spinel matter prefabricated component or it is integrated poured by the way of substitute traditional magnesium Chrome brick as dip pipe inner core, effectively prevent magnesite-chrome brick inner core in use because brickwork joint is easily etched or because of molten steel and Gas percussion and the defects of come off, drastically increase the safety in utilization and service life of dip pipe, avoid simultaneously Cr VI in magnesite-chrome brick can cause environmental pollution, endanger the problem of health of human body in the production and use process；Furthermore avoid The material mixing, molding of magnesite-chrome brick, high-temperature calcination in traditional handicraft, punch, invade the complicated procedures of forming such as salt, polishing, assembling, greatly carrying High production efficiency, reduce manufacturing cost.The time that the present invention prepares dip pipe is only traditional magnesite-chrome brick inner core dip pipe 70%；Inner core is magnesia Zirconium spinel matter in the present invention, and corundum spinel or corundum employed in unconventional process, It is steady with more the volume in excellent high temperature high vacuum working environment with very excellent thermal shock resistance and anti-scour property It is qualitative, it is remarkably improved the service life of RH dip pipes.
Brief description of the drawings
Fig. 1 is the application state schematic diagram that environment protective leakage-resisting formula RH refining furnace dip pipe inner cores of the present invention are preform structure；
Fig. 2 is the application state signal that environment protective leakage-resisting formula RH refining furnace dip pipe inner cores of the present invention are integrated poured structure Figure；
In figure, ring flange 1, steel courage body 2, inner core flame retardant coating 4, gap gravity flow bed of material 5, outsourcing flame retardant coating 6 is (wherein：On Portion refractory casting bed of material 6a, bottom refractory casting bed of material 6b), molten steel 7.
Embodiment
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1：
As shown in figure 1, a kind of environment protective leakage-resisting formula RH refining furnace dip pipe inner cores of the present invention, are arranged on the dip pipe in pipe The inner side of steel courage body 2 of shape structure, forms inner core flame retardant coating 4, it is filled between the inwall of steel courage body 2 using preform structure There is gap gravity flow bed of material 5.The ring flange 1 being connected with vacuum tank is provided with the top of steel courage body 2；Set in the outside of steel courage body 2 Outsourcing flame retardant coating 6 is equipped with, outsourcing flame retardant coating 6 is by exposed aerial top refractory casting bed of material 6a and is immersed in molten steel 7 Bottom refractory casting bed of material 6b combine.
Each component percentage by weight is in the inner core flame retardant coating 4 of above-mentioned preform structure：
Wherein, magnesia aggregate is the fused magnesite of MgO weight content >=97%, and magnesia aggregate is divided into by particle size：8mm ＜ particle diameters≤12mm, 5mm ＜ particle diameter≤8mm, 3mm ＜ particle diameter≤5mm, 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤1mm five Grading；The percentage by weight that each level is fitted in magnesia aggregate is followed successively by：13%th, 32%, 18%, 22% and 15%；
In magnesium-rich spinel aggregate, MgO weight contents：28~33%, Al2O3Weight content：65~70%, rich magnesium point is brilliant Stone aggregate is divided into by particle size：3mm ＜ particle diameters≤5mm, the 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤gradings of 1mm tri-；Respectively The percentage by weight that individual level is fitted in magnesium-rich spinel aggregate is followed successively by：36%th, 32% and 32%；
Mixing fine powders are the mixture of the fused magnesite of MgO weight content >=97%, magnesium-rich spinel and zirconium dioxide, are mixed Composition and division in a proportion example is 2: 1: 1, its particle diameter≤0.088mm；
Micro mist is SiO2The mixture of micro mist and active MgO micro mists, its mixed proportion are 1: 4；Also, SiO2In micro mist, SiO2Weight content >=96%, particle diameter≤5 μm；In active MgO micro mists, MgO weight content >=96%, particle diameter≤2 μm；
Bonding agent is pure calcium aluminate cement；
Water reducer is the polycarboxylic acids dehydragent ADS1/ADW1 of Qingdao An Mai companies production.
Embodiment 2：
As shown in figure 1, the inner core flame retardant coating 4 in the present embodiment is same as Example 1, still using preform structure.
Each component percentage by weight is in the inner core flame retardant coating 4 of above-mentioned preform structure：
Magnesia aggregate：45%；
Magnesium-rich spinel aggregate：25%；
Mixing fine powders：17.9%；
Micro mist：4.85%；
Bonding agent：7%；
Water reducer：0.1%；
Organic explosion-proof fiber：0.15%；
Wherein, magnesia aggregate is the magnesite clinker of MgO weight content >=97%, and magnesia aggregate is divided into by particle size：8mm ＜ particle diameters≤12mm, 5mm ＜ particle diameter≤8mm, 3mm ＜ particle diameter≤5mm, 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤1mm five Grading；The percentage by weight that each level is fitted in magnesia aggregate is followed successively by：17%th, 28%, 22%, 20% and 13%；
In magnesium-rich spinel aggregate, MgO weight contents：28~33%, Al2O3Weight content：65~70%, rich magnesium point is brilliant Stone aggregate is divided into by particle size：3mm ＜ particle diameters≤5mm, the 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤gradings of 1mm tri-；Respectively The percentage by weight that individual level is fitted in magnesium-rich spinel aggregate is followed successively by：44%th, 28% and 28%；
Mixing fine powders are the mixture of the fused magnesite of MgO weight content >=97%, magnesium-rich spinel and zirconium dioxide, are mixed Composition and division in a proportion example is 2: 1: 1, its particle diameter≤0.088mm；
Micro mist is SiO2The mixture of micro mist and active MgO micro mists, its mixed proportion are 1: 6；Also, SiO2In micro mist, SiO2Weight content >=96%, particle diameter≤5 μm；In active MgO micro mists, MgO weight content >=96%, particle diameter≤2 μm；
Bonding agent is hydrated alumina and the mixture in Ludox, and its mixed proportion is 1: 1；
Water reducer is calgon.
Embodiment 3：
As shown in figure 1, the inner core flame retardant coating 4 in the present embodiment is same as Example 1, still using preform structure.
Each component percentage by weight is in the inner core flame retardant coating 4 of above-mentioned preform structure：
Magnesia aggregate：50%；
Magnesium-rich spinel aggregate：20%；
Mixing fine powders：16.7%；
Micro mist：6.9%；
Bonding agent：6%；
Water reducer：0.3%；
Organic explosion-proof fiber：0.1%；
Wherein, magnesia aggregate is the fused magnesite of MgO weight content >=97% and the sintering magnesium of MgO weight content >=97% The mixture of sand, its mixed proportion are 1: 1；Magnesia aggregate is divided into by particle size：8mm ＜ particle diameters≤12mm, 5mm ＜ particle diameters≤ 8mm, 3mm ＜ particle diameter≤5mm, 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤gradings of 1mm five；Each level fits over magnesia aggregate In percentage by weight be followed successively by：15%th, 30%, 20%, 20% and 15%；
In magnesium-rich spinel aggregate, MgO weight contents：28~33%, Al2O3Weight content：65~70%, rich magnesium point is brilliant Stone aggregate is divided into by particle size：3mm ＜ particle diameters≤5mm, the 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤gradings of 1mm tri-；Respectively The percentage by weight that individual level is fitted in magnesium-rich spinel aggregate is followed successively by：40%th, 30% and 30%；
Mixing fine powders are the mixture of the fused magnesite of MgO weight content >=97%, magnesium-rich spinel and zirconium dioxide, are mixed Composition and division in a proportion example is 2: 1: 1, its particle diameter≤0.088mm；
Micro mist is SiO2The mixture of micro mist and active MgO micro mists, its mixed proportion are 1: 5；Also, SiO2In micro mist, SiO2Weight content >=96%, particle diameter≤5 μm；In active MgO micro mists, MgO weight content >=96%, particle diameter≤2 μm；
Bonding agent is Ludox；
Water reducer is the mixture of sodium tripolyphosphate and calgon, and its mixed proportion is 1: 2.
Embodiment 4：
As shown in Fig. 2 another environment protective leakage-resisting formula RH refining furnace dip pipe inner cores of the present invention, it is basic with embodiment 1 Identical, different simply forms inner core flame retardant coating 4 using integrated poured structure, and it need not be filled out between the inwall of steel courage body 2 Fill gap gravity flow bed of material 5.
Each component percentage by weight is in the inner core flame retardant coating 4 of above-mentioned integrated poured structure：
Magnesia aggregate：55%；
Magnesium-rich spinel aggregate：16%；
Mixing fine powders：16.7%；
Micro mist：7.85%；
Bonding agent：4%；
Water reducer：0.3%；
Organic explosion-proof fiber：0.15%；
Wherein, magnesia aggregate is the magnesite clinker of MgO weight content >=97% and the electric-melting magnesium of MgO weight content >=97% The mixture of sand, its mixed proportion are 2: 1；Magnesia aggregate is divided into by particle size：8mm ＜ particle diameters≤12mm, 5mm ＜ particle diameters≤ 8mm, 3mm ＜ particle diameter≤5mm, 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤gradings of 1mm five；Each level fits over magnesia aggregate In percentage by weight be followed successively by：14%th, 31%, 19%, 21% and 15%；
In magnesium-rich spinel aggregate, MgO weight contents：28~33%, Al2O3Weight content：65~70%, rich magnesium point is brilliant Stone aggregate is divided into by particle size：3mm ＜ particle diameters≤5mm, the 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤gradings of 1mm tri-；Respectively The percentage by weight that individual level is fitted in magnesium-rich spinel aggregate is followed successively by：42%th, 28% and 30%；
Mixing fine powders are the mixture of the fused magnesite of MgO weight content >=97%, magnesium-rich spinel and zirconium dioxide, are mixed Composition and division in a proportion example is 2: 1: 1, its particle diameter≤0.088mm；
Micro mist is SiO2The mixture of micro mist and active MgO micro mists, its mixed proportion are 1: 5；Also, SiO2In micro mist, SiO2Weight content >=96%, particle diameter≤5 μm；In active MgO micro mists, MgO weight content >=96%, particle diameter≤2 μm；
Bonding agent is the mixture of pure calcium aluminate cement and Ludox, and its mixed proportion is 2: 1；
Water reducer is sodium tripolyphosphate.
Embodiment 5：
As shown in Fig. 2 the inner core flame retardant coating 4 in the present embodiment is same as Example 4, using integrated poured structure.
Each component percentage by weight is in the inner core flame retardant coating 4 of above-mentioned integrated poured structure：
Magnesia aggregate：46%；
Magnesium-rich spinel aggregate：25%；
Mixing fine powders：14.7%；
Micro mist：6.9%；
Bonding agent：7%；
Water reducer：0.3%；
Organic explosion-proof fiber：0.1%；
Wherein, magnesia aggregate is the fused magnesite of MgO weight content >=97% and the sintering magnesium of MgO weight content >=97% The mixture of sand, its mixed proportion are 1.5: 1；Magnesia aggregate is divided into by particle size：8mm ＜ particle diameters≤12mm, 5mm ＜ particle diameters ≤ 8mm, 3mm ＜ particle diameters≤5mm, the 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤gradings of 1mm five；Each level fits over magnesia bone Percentage by weight in material is followed successively by：16%th, 29%, 21%, 20% and 14%；
In magnesium-rich spinel aggregate, MgO weight contents：28~33%, Al2O3Weight content：65~70%, rich magnesium point is brilliant Stone aggregate is divided into by particle size：3mm ＜ particle diameters≤5mm, the 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤gradings of 1mm tri-；Respectively The percentage by weight that individual level is fitted in magnesium-rich spinel aggregate is followed successively by：41%th, 29% and 30%；
Mixing fine powders are the mixture of the fused magnesite of MgO weight content >=97%, magnesium-rich spinel and zirconium dioxide, are mixed Composition and division in a proportion example is 2: 1: 1, its particle diameter≤0.088mm；
Micro mist is SiO2The mixture of micro mist and active MgO micro mists, its mixed proportion are 1: 4；Also, SiO2In micro mist, SiO2Weight content >=96%, particle diameter≤5 μm；In active MgO micro mists, MgO weight content >=96%, particle diameter≤2 μm；
Bonding agent is Ludox；
Water reducer is calgon.
Embodiment 6：
As shown in Fig. 2 the inner core flame retardant coating 4 in the present embodiment is also same as Example 4, still using integrated poured structure.
Each component percentage by weight is in the inner core flame retardant coating 4 of above-mentioned integrated poured structure：
Magnesia aggregate：52%；
Magnesium-rich spinel aggregate：20%；
Mixing fine powders：18%；
Micro mist：5%；
Bonding agent：5%；
Water reducer：0.8%；
Organic explosion-proof fiber：0.08%；
Wherein, magnesia aggregate is the fused magnesite of MgO weight content >=97%, and magnesia aggregate is divided into by particle size：8mm ＜ particle diameters≤12mm, 5mm ＜ particle diameter≤8mm, 3mm ＜ particle diameter≤5mm, 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤1mm five Grading；The percentage by weight that each level is fitted in magnesia aggregate is followed successively by：15%th, 30%, 22%, 20% and 13%；
In magnesium-rich spinel aggregate, MgO weight contents：28~33%, Al2O3Weight content：65~70%, rich magnesium point is brilliant Stone aggregate is divided into by particle size：3mm ＜ particle diameters≤5mm, the 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters≤gradings of 1mm tri-；Respectively The percentage by weight that individual level is fitted in magnesium-rich spinel aggregate is followed successively by：43%th, 29% and 28%；
Mixing fine powders are the mixture of the fused magnesite of MgO weight content >=97%, magnesium-rich spinel and zirconium dioxide, are mixed Composition and division in a proportion example is 2: 1: 1, its particle diameter≤0.088mm；
Micro mist is SiO2The mixture of micro mist and active MgO micro mists, its mixed proportion are 1: 4；Also, SiO2In micro mist, SiO2Weight content >=96%, particle diameter≤5 μm；In active MgO micro mists, MgO weight content >=96%, particle diameter≤2 μm；
Bonding agent is hydrated alumina；
Water reducer is the polycarboxylic acids dehydragent ADS1/ADW1 of Qingdao An Mai companies.
Finally it is pointed out that above example is only the more representational example of the present invention.It is clear that the invention is not restricted to Above-described embodiment, there can also be many deformations.Every technical spirit according to the present invention is to any letter made for any of the above embodiments Single modification, equivalent variations and modification, are considered as belonging to protection scope of the present invention.

Claims (6)

1. a kind of environment protective leakage-resisting formula RH refining furnace dip pipe inner cores, it is arranged on the steel courage body (2) of the dip pipe in tubular construction Inner side, inner core flame retardant coating (4) is formed using preform structure or integrated poured structure, it is characterised in that：The inner core flame retardant coating (4) each component percentage by weight is in：
Wherein：Mixing fine powders are the fused magnesite of MgO weight content >=97%, the arbitrary proportion of magnesium-rich spinel and zirconium dioxide Mixture, its particle diameter≤0.088mm；Micro mist is SiO2The arbitrary proportion mixture of micro mist and active MgO micro mists, its particle diameter≤10 μm；
The magnesia aggregate is in the fused magnesite of MgO weight content >=97% and the magnesite clinker of MgO weight content >=97% One or two kinds of mixtures, particle diameter≤12mm of the magnesia aggregate；And：
The magnesia aggregate is divided into by particle size：8mm ＜ particle diameters≤12mm, 5mm ＜ particle diameter≤8mm, 3mm ＜ particle diameter≤5mm, The 1mm ＜ particle diameters≤3mm and 0mm ＜ particle diameters≤gradings of 1mm five；Each level fits over percentage by weight in magnesia aggregate successively For：13~17%, 28~32%, 18~22%, 18~22% and 13~15%；
In the magnesium-rich spinel aggregate, MgO weight contents are 28~33%, Al2O3Weight content is 65~70%, the richness Particle diameter≤5mm of magnesia spinel aggregate；And：
The magnesium-rich spinel aggregate is divided into by particle size：3mm ＜ particle diameters≤5mm, 1mm ＜ particle diameter≤3mm and 0mm ＜ particle diameters Tri- gradings of≤1mm；The percentage by weight that each level is fitted in magnesium-rich spinel aggregate is followed successively by：36~44%, 28~32% With 28~32%.
2. environment protective leakage-resisting formula RH refining furnace dip pipe inner cores according to claim 1, it is characterised in that：The mixing fine powders In, the mixed proportion of fused magnesite, magnesium-rich spinel and zirconium dioxide is 1.5~2.5: 0.5~1.5: 0.5~1.5.
3. environment protective leakage-resisting formula RH refining furnace dip pipe inner cores according to claim 1, it is characterised in that：In the micro mist, SiO2The mixed proportion of micro mist and active MgO micro mists is 1: 4~6.
4. environment protective leakage-resisting formula RH refining furnace dip pipe inner cores according to claim 3, it is characterised in that：The SiO2Micro mist In, SiO2Weight content >=96%, particle diameter≤5 μm；In the active MgO micro mists, MgO weight content >=96%, the μ of particle diameter≤2 m。
5. environment protective leakage-resisting formula RH refining furnace dip pipe inner cores according to claim 1, it is characterised in that：The bonding agent is The mixture of one or both of pure calcium aluminate cement, hydrated alumina, Ludox arbitrary proportion.
6. environment protective leakage-resisting formula RH refining furnace dip pipe inner cores according to claim 1, it is characterised in that：The water reducer is The mixture of one or more of arbitrary proportions in sodium tripolyphosphate, calgon, polycarboxylic acids dehydragent.
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