CN106946550A - Excellent magnesia-spinel brick of a kind of antistrip performance and preparation method thereof - Google Patents

Excellent magnesia-spinel brick of a kind of antistrip performance and preparation method thereof Download PDF

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CN106946550A
CN106946550A CN201710237020.4A CN201710237020A CN106946550A CN 106946550 A CN106946550 A CN 106946550A CN 201710237020 A CN201710237020 A CN 201710237020A CN 106946550 A CN106946550 A CN 106946550A
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magnesia
aggregate
spinelle
powder
preparation
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CN106946550B (en
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方斌祥
罗明
薛军柱
尹明强
徐亮
魏国平
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Zhejiang Zili High Temperature Technology Co., Ltd
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Zhejiang Zili High Temperature Technology Co Ltd
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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
    • C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/043—Refractories from grain sized mixtures
    • 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
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/628—Coating the powders or the macroscopic reinforcing agents
    • C04B35/62802—Powder coating materials
    • C04B35/62805—Oxide ceramics
    • 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
    • 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
    • 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
    • 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
    • C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
    • 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
    • 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
    • C04B2235/38—Non-oxide ceramic constituents or additives
    • C04B2235/3817—Carbides
    • C04B2235/3821—Boron carbides
    • 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
    • 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
    • C04B2235/40—Metallic constituents or additives not added as binding phase
    • C04B2235/402—Aluminium
    • 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
    • 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
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/422—Carbon
    • C04B2235/424—Carbon black
    • 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
    • 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
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
    • C04B2235/428—Silicon

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

The invention discloses excellent magnesia-spinel brick of a kind of antistrip performance and preparation method thereof, wherein preparation method is comprised the steps of：1) by varigrained magnesia particle and spinelle combination magnesia particle and carbon black, carbon black uniform adsorption is made in particle surface；2) using the magnesia and spinelle combination magnesia particle by the processing of carbon black adsorption of modification as aggregate, using magnesia powder, Spinel micropowder as matrix, and metal Al, simple substance Si, B are added4The antioxidants such as C and high temperature sintering agent, it is compressing after being well mixed using lignin liquor, phenolic resin or magnesium aluminate cementing agent as bonding agent, and prepared through low-temperature bake.The present invention carries out surface modification using carbon black to aggregate, and introduce spinelle combination magnesia, the thermal coefficient of expansion of magnesia-spinel brick is significantly reduced on the premise of slag resistance is not influenceed, the microstructure of product is optimized simultaneously, applied to RH inner lining of furnace, the antistrip performance of product is can obviously improve, is increased the service life.

Description

Excellent magnesia-spinel brick of a kind of antistrip performance and preparation method thereof
Technical field
The present invention relates to fire resisting material field, and in particular to a kind of excellent magnesia-spinel brick of antistrip performance and its preparation Method.
Background technology
RH stoves are the essential external refining smeltings of high-grade steel grade such as production Automobile Plate, electrical sheet, bearing steel, pipe line steel Golden container, resistance to material requirement is stable with good anti-molten steel performance of flushing, alkali resistance scouring performance, antistrip performance and vacuum Performance, the magnesite-chrome brick that current main flow is still burnt till using high temperature.Due to there is chromium to environment during the production and use of magnesite-chrome brick Pollution risk, is repelled by policy and the social people's livelihood, is that this has occurred in that a large amount of research reports without picrochromite unburned brick And application, such as 102442829 A of A, CN of patent of invention document CN 103570364, such as Baoshan Iron and Steel Group's RH stoves 100% Trend of Chrome-free, steel mill's RH stoves such as Anshan iron and steel plant, Shoudu Iron and Steel Co, Ma Gang, ripples steel, emerging clear special steel are also wideling popularize magnesia spinel unburned brick.
Using magnesia for main material above-mentioned magnesia-spinel brick, magnesium aluminate spinel is auxiliary material, and metal is added in matrix more The materials such as Al, metal Si, while the organic matters such as lignin, resin or gum arabic are used for bonding agent, it is low after mechanical pressing Temperature baking is prepared.Product has good alkali resistance scouring performance, anti-molten steel performance of flushing and vacuum stability energy, but Because of the thermal coefficient of expansion of magnesia in itself very big (14~15 × 10-6℃-1, 20~1500 DEG C), the metal Al powder in matrix is most in addition Al can be oxidized to eventually2O3, and Al2O3It can react to form magnesium aluminate spinel with MgO again, and produce larger volumetric expansion (point crystalline substance Stone reaction can bring about 8% volumetric expansion) so that the antistrip performance of the product at high temperature is not good, as the restriction production The bottleneck that product service life further extends.
The content of the invention
The invention provides excellent magnesia-spinel brick of a kind of antistrip performance and preparation method thereof, magnesia spinel can guarantee that Brick resists while with good alkali resistance scouring performance, anti-molten steel performance of flushing and vacuum stability energy with good Spalling resistance, so as to largely extend its service life.
A kind of preparation method of the excellent magnesia-spinel brick of antistrip performance, by each raw material mix it is compressing after, 180 ~200 DEG C of insulation at least 8h, obtain the magnesia-spinel brick；
The parts by weight of raw materials composition of the magnesia-spinel brick is as shown in the table：
Component Particle diameter Parts by weight
Magnesia aggregate 5~3mm 5~10
Magnesia aggregate 3~1mm 15~40
Magnesia aggregate 1~0mm 15~30
Magnesia powder ≤0.088mm 5~10
Spinelle combination magnesia aggregate 5~3mm 5~10
Spinelle combination magnesia aggregate 3~1mm 7~20
Spinelle combination magnesia aggregate 1~0mm 7~15
Spinel micropowder d50≤2μm 5~10
Metal Al powder ≤0.088mm 2~4
Simple substance Si powder ≤0.088mm 1~3
B4C fine powders ≤0.045mm 0.5~2
Bonding agent —— 2~4
In table, the spinelle combination magnesia is molten through calcining or electric arc furnaces after light-burning magnesium powder and industrial alumina powder are ground altogether Change crystallization to obtain；
Magnesia aggregate and spinelle the combination magnesia aggregate is modified by carbon blacksurface.
In the Spinel micropowder, Al2O3=66~80%, Al2O3+ MgO >=98%；In the metal Al powder, Al content >=98%；In the simple substance Si powder, Si content >=98%；The B4In C fine powders, B4C >=95%.
The present invention is using the magnesia particle Jing Guo carbon blacksurface modification and spinelle combination magnesia particle as aggregate, with magnesium Sand fine powder, Spinel micropowder are matrix, and add metal Al powder, simple substance Si powder, B4The antioxidants such as C fine powders and high temperature sintering Agent, each raw material is well mixed rear compressing, and be made through low-temperature bake.
Spinelle combination magnesia aggregate is introduced in magnesia-spinel brick raw material, and to magnesia aggregate and spinelle combination magnesia Aggregate carries out surface modification using carbon black, on the premise of slag resistance is not influenceed, significantly reduces the hot swollen of magnesia-spinel brick Swollen coefficient, while optimizing the microstructure of product, for RH stoves and ladle liner, can obviously improve the anti-strip of product Performance, increases the service life.
Preferably, the parts by weight of raw materials composition of the magnesia-spinel brick is as shown in the table：
Component Particle diameter Parts by weight
Magnesia aggregate 5~3mm 8
Magnesia aggregate 3~1mm 15~40
Magnesia aggregate 1~0mm 15~30
Magnesia powder ≤0.088mm 5~10
Spinelle combination magnesia aggregate 5~3mm 5~10
Spinelle combination magnesia aggregate 3~1mm 7~20
Spinelle combination magnesia aggregate 1~0mm 7~15
Spinel micropowder d50≤2μm 5~10
Metal Al powder ≤0.088mm 2~4
Simple substance Si powder ≤0.088mm 1~3
B4C fine powders ≤0.045mm 0.5~2
Bonding agent —— 2~4
The purpose that the carbon blacksurface is modified is that the carbon black uniform adsorption for making nanometer particle size is wrapped in magnesia particle and point crystalline substance The surface of stone combination magnesia particle, in order to realize this purpose, can use various means of the prior art, it is preferable that institute State carbon blacksurface modification concrete operations be：
Magnesia aggregate and/or spinelle combination magnesia aggregate are put into ball mill and ground altogether with carbon black, the carbon black plus It is the 0.2~0.8% of aggregate quality to be modified to enter amount.
Surface modification for magnesia aggregate and spinelle combination magnesia aggregate can be carried out respectively, can also be entered simultaneously OK, you can ground, can also be distinguished altogether with magnesia aggregate, spinelle combination magnesia aggregate and carbon black being put into ball mill simultaneously Surface modification treatment is carried out to magnesia aggregate and spinelle combination magnesia aggregate.
Quality meter of the addition of the carbon black according to aggregate to be modified, the quality of aggregate to be modified do not repartition species with And particle size.Do not add any abrasive body when carrying out aggregate surface modification using carbon black, in ball mill, for example mill ball or Grinding rod.The rotating speed of ball mill is unsuitable too fast, to prevent that magnesia aggregate and spinelle combination magnesia aggregate from occurring second-time breakage.
Preferably, when carrying out aggregate surface modification using carbon black, the rotating speed of ball mill is 20~30r/min, during ball milling Between be 30~45min.The rotating speed and Ball-milling Time of ball mill need to ensure that carbon black can cover in particle surface securely, enter When the follow-up raw material of row is mixed, it is difficult to come off from particle surface.
Preferably, in the spinelle combination magnesia, content of MgO is 85~90%, Al2O3Content is 10~15%, point Spar is fully populated between the crystal boundary of periclase crystal.
The spinelle combination magnesia calcines (calcining heat after being ground altogether using light-burning magnesium powder and industrial alumina powder through shaft furnace For 1800~1900 DEG C) obtain or obtained through electric arc furnaces melting crystal.
Preferably, magnesia aggregate is magnesite clinker or fused magnesite, content of MgO is more than 97% in magnesia aggregate.
In order to ensure the surface modification effect of magnesia aggregate and spinelle combination magnesia aggregate, to realize magnesia-spinel brick The lifting of the performances such as anti-strip, needs to carry out preferably, it is preferable that the model N220 of the carbon black for the indices of carbon black ~N880.That is, one kind in model N220, N330, N440, N550, N660, N770, N880 of described carbon black.
Preferably, the bonding agent is one kind in lignin liquor, phenolic resin, magnesium aluminate cementing agent, wherein aluminium MgO mass percent >=50% in sour magnesium cementing agent, particle diameter is≤0.088mm.
Preferably, when carrying out raw material mixing, first by Spinel micropowder, metal Al powder, simple substance Si powder and B4C fine powders enter Row premixing；Then premixing product is well mixed with remaining raw material.
Pre-mixing process can be carried out in cone mixer or edge runner, all aggregates, premixing product and magnesia Fine powder is molded after being well mixed in edge runner-wet mill through press high-pressure, is then entered tunnel cave and is incubated 8h in 180~200 DEG C, obtains institute State magnesia-spinel brick.
Present invention also offers a kind of excellent magnesia-spinel brick of antistrip performance, it is prepared into using described preparation method Arrive.
RH stoves are magnesia with the body material of magnesia-spinel brick, and the thermal coefficient of expansion of magnesia is very high in refractory material (14~15 × 10-6℃-1, 20~1500 DEG C), the present invention is combined using carbon-enwrap technology to magnesia aggregate and spinelle first Magnesia aggregate is surface-treated so that in the magnesia-spinel brick after shaping, there is one between aggregate and aggregate, aggregate and matrix The flexible carbon black thin layer of layer, rather than directly contact condition, so as to largely reduce the elastic modelling quantity of magnesia-spinel brick And thermal coefficient of expansion, improve its antistrip performance.
In addition, there is metal Al powder and simple substance Si powder in magnesia-spinel brick matrix, and at high temperature, metal Al powder and simple substance Si With the carbon black of aggregate surface ceramics reaction can occur for powder, and generate Al in aggregate surface4C3, the ceramic phase, optimization production such as AlN and SiC The microstructure of product, the thermal coefficient of expansion of aggregate can be also reduced to a certain extent, improve antistrip performance.Traditional mixes The ceramics reaction of metal and carbon all occurs in matrix substantially under material technique, high temperature, does not reach the effect of the present invention.
RH stoves are magnesium aluminate spinels with the secondary raw material of magnesia-spinel brick, and spinelle content is higher, the thermal expansion system of product Number is lower, and antistrip performance is better, but alkali resistance slag melting loss performance can decline simultaneously.
Generally directly in conjunction with or by dicalcium silicate, tricalcium silicate, monticellite between the crystal grain of conventional magnesia Or the thing such as manganolite is combined, the present invention introduces spinelle combination magnesia as aggregate in the raw material of magnesia-spinel brick, It is entirely magnesium aluminate spinel phase between the magnesia crystal grain of spinelle combination magnesia, this special thing distributed mutually is avoid or reduced Direct contact between periclase crystal grain, reduces the thermal coefficient of expansion of aggregate, and high content of MgO and dystectic spinelle Its good alkali resistance scouring performance is also ensure that with reference to phase (2135 DEG C of aluminum-spinel fusing point).
The beneficial effects of the invention are as follows：
1) surface modification treatment is carried out to magnesia aggregate and spinelle combination magnesia aggregate using carbon-enwrap technology, makes height The ceramics reaction of the lower metal of temperature and carbon black is gathered in aggregate surface, optimizes the microstructure of magnesia-spinel brick, thus compared with The thermal coefficient of expansion of product is reduced in big degree, the antistrip performance of magnesia-spinel brick is improved.
2) using spinelle combination magnesia as aggregate, its thermal coefficient of expansion is lower than magnesia, and alkali resistance scouring performance It is better than magnesium aluminate spinel, thus its thermal coefficient of expansion is also reduced while guarantee magnesia-spinel brick good slag resistance, change It has been apt to antistrip performance.
The magnesia-spinel brick that the present invention is provided is applied to RH inner lining of furnace, is used under equal working condition than in the market Magnesia-spinel brick there is more preferable antistrip performance, thus with longer service life.The magnesia spinel that the present invention is provided Brick can be also widely applied to refining ladle molten bath and bag bottom region.
Brief description of the drawings
Fig. 1 is aggregate surface shape of the magnesia-spinel brick made without the aggregate of carbon black modified processing after high-temperature process Looks；
Fig. 2 is aggregate surface shape of the magnesia-spinel brick of the aggregate making by carbon black modified processing after high-temperature process Looks.
Embodiment
Embodiment 1
A kind of excellent magnesia-spinel brick of antistrip performance, is produced as follows：
1) 5~3mm, 3~1mm, 1~0mm magnesia aggregate and spinelle combination magnesia aggregate are weighed simultaneously in the ratio of table 1 Mixing, adds the N220 type carbon blacks for accounting for its total amount 0.3%, and 20min is blended in rotating speed is 30r/min ball mill, makes nanometer The carbon black of particle diameter is fully wrapped in the particle surface of magnesia aggregate and spinelle combination magnesia aggregate.
Wherein, the preparation method of spinelle combination magnesia is：The light-burning magnesium powder and Al of MgO >=95%2O3>=98.5% industry Alumina powder is by weight 87:After 13 weigh, pressure ball is ground altogether, is formed in shaft furnace through 1850 DEG C of calcinings.
2) by Spinel micropowder, metal Al powder, simple substance Si powder and B4C fine powders in the ratio of table 1 weigh after in cone mixer Or be well mixed in edge runner, it is used as the premixed powder of magnesia-spinel brick.
3) after the magnesia particle of surface soot parcel modification, spinelle combination magnesia particle being weighed in the ratio of table 1, Be put into kolleroang and stir 1min, the lignin liquor of outer addition 3% stirring 2min, then add magnesia powder (granularity≤ 0.088mm) continue to stir 15min with premixed powder, aggregate, magnesia powder and premixed powder is fully mixed.
4) by mixed pug high-pressure molding in a mold, then enter tunnel cave and be incubated 8h in 180~200 DEG C to produce into Product.
The raw material proportioning of 1 embodiment of table 1
Embodiment 2
A kind of excellent magnesia-spinel brick of antistrip performance, is produced as follows：
1) 5~3mm, 3~1mm, 1~0mm magnesia aggregate and spinelle combination magnesia aggregate are weighed simultaneously in the ratio of table 2 Mixing, adds the N550 type carbon blacks for accounting for its total amount 0.5%, and 35min is blended in rotating speed is 25r/min ball mill, makes nanometer The carbon black of particle diameter is fully wrapped in particle surface.
Wherein, the preparation method of spinelle combination magnesia is：The light-burning magnesium powder and Al of MgO >=95%2O3>=98.5% industry Alumina powder is by weight 87:After 13 weigh, pressure ball is ground altogether, is formed in shaft furnace through 1850 DEG C of calcinings.
2) by Spinel micropowder, metal Al powder, simple substance Si powder and B4C fine powders in the ratio of table 2 weigh after in cone mixer Or be well mixed in edge runner, it is used as the premixed powder of magnesia-spinel brick.
3) after the magnesia particle of surface soot parcel modification, spinelle combination magnesia particle being weighed in the ratio of table 2, Be put into kolleroang and stir 1min, the phenolic resin of outer addition 2% stirring 2min, then add magnesia powder and premixed powder after Continuous stirring 20min, makes aggregate, magnesia powder and premixed powder fully mix.
4) by mixed pug high-pressure molding in a mold, then enter tunnel cave and be incubated 8h in 180~200 DEG C to produce into Product.
The dispensing of 2 embodiment of table 2 is matched
Embodiment 3
A kind of excellent magnesia-spinel brick of antistrip performance, is produced as follows：
1) by each granularity sand of 5~3mm, 3~1mm, 1~0mm magnesia aggregate and spinelle combination magnesia aggregate With the N880 type carbon blacks for accounting for the granularity sand 0.8%, 40min is blended in rotating speed is 20r/min ball mill, makes nanometer particle size Carbon black is fully wrapped in particle surface.
Wherein, the preparation method of spinelle combination magnesia is：The light-burning magnesium powder and Al of MgO >=95%2O3>=98.5% industry Alumina powder is by weight 87:After 13 weigh, pressure ball is ground altogether, milling body altogether is directly melted in electric arc furnaces, crystallisation by cooling is obtained.
2) by Spinel micropowder, metal Al powder, simple substance Si powder and B4C fine powders in the ratio of table 3 weigh after in cone mixer Or be well mixed in edge runner, it is used as the premixed powder of magnesia-spinel brick.
3) after the magnesia particle of surface soot parcel modification, spinelle combination magnesia particle being weighed in the ratio of table 3, It is put into kolleroang and stirs 1min, the magnesium aluminate cementing agent stirring 1min of outer addition 3.5%, then the water of outer addition 2% is stirred 3min, then adds magnesia powder and premixed powder continues to stir 15min, aggregate, magnesia powder and premixed powder is fully mixed It is even.
4) by mixed pug high-pressure molding in a mold, then enter tunnel cave and be incubated 8h in 180~200 DEG C to produce into Product.
The dispensing of 3 embodiment of table 3 is matched
Comparative example 1
A kind of excellent magnesia-spinel brick of antistrip performance, is produced as follows：
1) by Spinel micropowder, metal Al powder, simple substance Si powder and B4C fine powders in the ratio of table 4 weigh after in cone mixer Or be well mixed in edge runner, it is used as the premixed powder of magnesia-spinel brick.
2) by fused magnesite particle in the ratio of table 4 weigh after, be put into kolleroang and stir 1min, outer addition 3% it is wooden Plain solution stirs 2min, then adds fused magnesite fine powder (granularity≤0.088mm) and premixed powder continues to stir 15min, make Aggregate, magnesia powder and premixed powder are fully mixed.
3) by mixed pug high-pressure molding in a mold, then enter tunnel cave and be incubated 8h in 180~200 DEG C to produce into Product.
The raw material proportioning of 4 comparative example of table 1
Performance test
The performance test results of embodiment 1~3 are as shown in table 4.
Table 4
Found out by table 4, because of the addition of spinelle combination magnesia, the bulk density and intensity of each embodiment are slightly decreased, but Remaining linear expansivity after 1600 DEG C of processing declines substantially, and substantially, this shows the magnesium point that the present invention is provided to thermal shock resistance amplification Spar brick can show more preferable antistrip performance in use.
Fig. 1 is aggregate surface shape of the magnesia-spinel brick made without the aggregate of carbon black modified processing after high-temperature process Looks；Fig. 2 is aggregate surface pattern of the magnesia-spinel brick of the aggregate making by carbon black modified processing after high-temperature process.By scheming 1st, Fig. 2 can be seen that carries out surface modification treatment using carbon-enwrap technology to magnesia aggregate and spinelle combination magnesia aggregate, The ceramics reaction of metal and carbon black under high temperature can be made to be gathered in aggregate surface, optimize the microstructure of magnesia-spinel brick, So as to largely reduce the thermal coefficient of expansion of product, the antistrip performance of magnesia-spinel brick is improved.

Claims (9)

1. the preparation method of the excellent magnesia-spinel brick of a kind of antistrip performance, it is characterised in that each raw material is mixed and is pressed into After type, at least 8h is incubated at 180~200 DEG C, the magnesia-spinel brick is obtained；
The parts by weight of raw materials composition of the magnesia-spinel brick is as shown in the table：
Component Particle diameter Parts by weight Magnesia aggregate 5~3mm 5~10 Magnesia aggregate 3~1mm 15~40 Magnesia aggregate 1~0mm 15~30 Magnesia powder ≤0.088mm 5~10 Spinelle combination magnesia aggregate 5~3mm 5~10 Spinelle combination magnesia aggregate 3~1mm 7~20 Spinelle combination magnesia aggregate 1~0mm 7~15 Spinel micropowder d50≤2μm 5~10 Metal Al powder ≤0.088mm 2~4 Simple substance Si powder ≤0.088mm 1~3 B4C fine powders ≤0.045mm 0.5~2 Bonding agent —— 2~4
In table, the spinelle combination magnesia is to be tied after light-burning magnesium powder and industrial alumina powder are ground altogether through calcining or electric arc furnaces fusing Crystalline substance is obtained；
Magnesia aggregate and spinelle the combination magnesia aggregate is modified by carbon blacksurface.
2. the preparation method of the excellent magnesia-spinel brick of antistrip performance as claimed in claim 1, it is characterised in that the charcoal The concrete operations that black surface is modified are：
Magnesia aggregate and/or spinelle combination magnesia aggregate are put into ball mill and ground altogether with carbon black, the addition of the carbon black For the 0.2~0.8% of aggregate quality to be modified.
3. the preparation method of the excellent magnesia-spinel brick of antistrip performance as claimed in claim 2, it is characterised in that use charcoal During black progress aggregate surface modification, the rotating speed of ball mill is 20~30r/min, and Ball-milling Time is 30~45min.
4. the preparation method of the excellent magnesia-spinel brick of antistrip performance as claimed in claim 1, it is characterised in that the point In spar combination magnesia, content of MgO is 85~90%, Al2O3Content is 10~15%, and spinelle is fully populated with brilliant in periclase Between the crystal boundary of body.
5. the preparation method of the excellent magnesia-spinel brick of antistrip performance as claimed in claim 1, it is characterised in that magnesia bone Expect for magnesite clinker or fused magnesite, content of MgO is more than 97% in magnesia aggregate.
6. the preparation method of the excellent magnesia-spinel brick of antistrip performance as claimed in claim 1, it is characterised in that the charcoal Black model N220~N880.
7. the preparation method of the excellent magnesia-spinel brick of antistrip performance as claimed in claim 1, it is characterised in that the knot Mixture is one kind in lignin liquor, phenolic resin, magnesium aluminate cementing agent, MgO quality hundred wherein in magnesium aluminate cementing agent Fraction >=50%, particle diameter is≤0.088mm.
8. the preparation method of the excellent magnesia-spinel brick of antistrip performance as claimed in claim 1, it is characterised in that carry out former During material mixing, first by Spinel micropowder, metal Al powder, simple substance Si powder and B4C fine powders are pre-mixed；Then premixing is produced Thing is well mixed with remaining raw material.
9. the excellent magnesia-spinel brick of a kind of antistrip performance, it is characterised in that using as described in any one of claim 1~8 Preparation method prepare.
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CN110922168A (en) * 2019-12-09 2020-03-27 辽宁中镁高温材料有限公司 Special magnesia-calcium brick and manufacturing method thereof
CN113968724A (en) * 2021-10-29 2022-01-25 马鞍山利尔开元新材料有限公司 Metal modified magnesia, low-carbon converter magnesium sliding plate and preparation method thereof

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CN110922168A (en) * 2019-12-09 2020-03-27 辽宁中镁高温材料有限公司 Special magnesia-calcium brick and manufacturing method thereof
CN113968724A (en) * 2021-10-29 2022-01-25 马鞍山利尔开元新材料有限公司 Metal modified magnesia, low-carbon converter magnesium sliding plate and preparation method thereof

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