CN106946550B - A kind of magnesia-spinel brick and preparation method thereof that antistrip performance is excellent - Google Patents

A kind of magnesia-spinel brick and preparation method thereof that antistrip performance is excellent Download PDF

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CN106946550B
CN106946550B CN201710237020.4A CN201710237020A CN106946550B CN 106946550 B CN106946550 B CN 106946550B CN 201710237020 A CN201710237020 A CN 201710237020A CN 106946550 B CN106946550 B CN 106946550B
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magnesia
aggregate
spinelle
powder
spinel
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CN106946550A (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
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    • 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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Abstract

The invention discloses a kind of magnesia-spinel bricks and preparation method thereof that antistrip performance is excellent, wherein 1) preparation method is comprised the steps of: varigrained magnesia particle and spinelle combination magnesia particle and carbon black, makes carbon black uniform adsorption in particle surface；2) using the magnesia and spinelle combination magnesia particle handled by 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, using lignin liquor, phenolic resin or magnesium aluminate cementing agent as bonding agent, compression moulding after mixing, and prepared through low-temperature bake.The present invention carries out surface to aggregate using carbon black and is modified, and introduce spinelle combination magnesia, the thermal expansion coefficient of magnesia-spinel brick is significantly reduced under the premise of not influencing slag resistance, the microstructure of product is optimized simultaneously, applied to RH inner lining of furnace, the antistrip performance that can obviously improve product, prolongs the service life.

Description

A kind of magnesia-spinel brick and preparation method thereof that antistrip performance is excellent
Technical field
The present invention relates to fire resisting material fields, and in particular to a kind of magnesia-spinel brick that antistrip performance is excellent and its preparation Method.
Background technique
RH furnace is the essential external refining smeltings of high-grades steel grade such as production Automobile Plate, electrical sheet, bearing steel, pipe line steel Golden container, resistance to material require good anti-molten steel performance of flushing, alkali resistance scouring performance, antistrip performance and vacuum and stablize Performance, mainstream still uses the magnesite-chrome brick of high temperature firing at present.Since to environment, there are chromium in the production and use process of magnesite-chrome brick Pollution risk is repelled by policy and the social people's livelihood, has had already appeared the largely research report without picrochromite unburned brick thus And application, such as 103,570,364 102442829 A of A, CN of patent of invention document CN, such as Baoshan Iron and Steel Group's RH furnace 100% Trend of Chrome-free, steel mills' RH furnaces 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.
It is main material that above-mentioned magnesia-spinel brick, which mostly uses magnesia, and magnesium aluminate spinel is auxiliary material, and metal is added in matrix The substances such as Al, metal Si, while using the organic matters such as lignin, resin or gum arabic 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 expansion coefficient very big (14~15 × 10 of magnesia itself-6℃-1, 20~1500 DEG C), the metal Al powder in matrix is most in addition It can be oxidized to Al eventually2O3, and Al2O3It can react to form magnesium aluminate spinel with MgO again, and generate biggish volume expansion (point crystalline substance Stone reaction can bring about 8% volume expansion) so that the antistrip performance of the product at high temperature is bad, becomes and restrict the production The further extended bottleneck of product service life.
Summary of the invention
The present invention provides a kind of magnesia-spinel bricks and preparation method thereof that antistrip performance is excellent, can guarantee magnesia spinel Brick has good anti-while with good alkali resistance scouring performance, anti-molten steel performance of flushing and vacuum stability energy Spalling resistance, to largely prolong its service life.
A kind of preparation method for the magnesia-spinel brick that antistrip performance is excellent, after each raw material mixing compression moulding, 180 ~200 DEG C of heat preservation 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 Partial size 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 powder ≤0.045mm 0.5~2
Bonding agent —— 2~4
In table, the spinelle combination magnesia is to melt after light-burning magnesium powder and industrial alumina powder grinds altogether through calcining or electric arc furnaces Change crystallization to obtain；
It is modified that the magnesia aggregate and spinelle combination magnesia aggregate pass through 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 powder, B4C >=95%.
The present invention using Jing Guo carbon blacksurface modification magnesia particle 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 powder and high temperature sintering Agent is made by the compression moulding after mixing of each raw material, and 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 using carbon black and is modified, and under the premise of not influencing slag resistance, the heat for significantly reducing magnesia-spinel brick is swollen Swollen coefficient, while the microstructure of product is optimized, it is used for RH furnace and ladle liner, can obviously improve the anti-strip of product Performance prolongs the service life.
Preferably, the parts by weight of raw materials composition of the magnesia-spinel brick is as shown in the table:
Component Partial size 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 powder ≤0.045mm 0.5~2
Bonding agent —— 2~4
The modified purpose of the carbon blacksurface is that the carbon black uniform adsorption of nanometer particle size is made to be wrapped in magnesia particle and point crystalline substance The surface of stone combination magnesia particle can use various means in the prior art, it is preferable that institute in order to realize the purpose State the modified concrete operations of carbon blacksurface are as follows:
Magnesia aggregate and/or spinelle combination magnesia aggregate are put into ball mill and are ground altogether with carbon black, the carbon black adds Enter 0.2~0.8% that amount is aggregate quality to be modified.
Surface modification for magnesia aggregate and spinelle combination magnesia aggregate can carry out respectively, can also simultaneously into Row, it can while magnesia aggregate, spinelle combination magnesia aggregate and carbon black being put into ball mill and ground altogether, it can also distinguish Surface modification treatment is carried out to magnesia aggregate and spinelle combination magnesia aggregate.
Quality meter of the additional amount of the carbon black according to aggregate to be modified, the quality of aggregate to be modified do not repartition type 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 revolving speed of ball mill is unsuitable too fast, to prevent magnesia aggregate and spinelle combination magnesia aggregate from second-time breakage occurs.
Preferably, when carrying out aggregate surface modification using carbon black, the revolving speed of ball mill is 20~30r/min, when ball milling Between be 30~45min.The revolving speed and Ball-milling Time of ball mill need to guarantee that carbon black can cover securely in particle surface, into When row subsequent raw material mixing, it is not easy to fall off from particle surface.
Preferably, content of MgO is 85~90%, Al in the spinelle combination magnesia2O3Content is 10~15%, point Spar is fully populated between the crystal boundary of periclase crystal.
The spinelle combination magnesia grind altogether using light-burning magnesium powder and industrial alumina powder after through shaft furnace calcining (calcination temperature It is 1800~1900 DEG C) and obtain or obtained through electric arc furnaces melting crystal.
Preferably, magnesia aggregate is magnesite clinker or fused magnesite, content of MgO is greater than 97% in magnesia aggregate.
In order to guarantee the surface modification effect of magnesia aggregate and spinelle combination magnesia aggregate, to realize magnesia-spinel brick The promotion of the performances such as anti-strip needs to carry out preferred, it is preferable that the model N220 of the carbon black for the indices of carbon black ~N880.That is, one of model N220, N330, N440, N550, N660, N770, N880 of the carbon black.
Preferably, the bonding agent is one of lignin liquor, phenolic resin, magnesium aluminate cementing agent, wherein aluminium Mass percent >=50% of MgO in sour magnesium cementing agent, partial size are≤0.088mm.
Preferably, when carrying out raw material mixing, first by Spinel micropowder, metal Al powder, simple substance Si powder and B4C fine powder into Row premixing；Then premixing product is uniformly mixed with remaining raw material.
Pre-mixing process can carry out in cone mixer or edge runner, all aggregates, premixing product and magnesia Fine powder forms after being uniformly mixed in edge runner-wet mill through press high-pressure, then obtains institute in 180~200 DEG C of heat preservation 8h into tunnel oven State magnesia-spinel brick.
The present invention also provides a kind of magnesia-spinel bricks that antistrip performance is excellent, are prepared into using the preparation method It arrives.
The body material of RH furnace magnesia-spinel brick is magnesia, and the thermal expansion coefficient of magnesia is very high in refractory material (14~15 × 10-6℃-1, 20~1500 DEG C), the present invention uses carbon-enwrap technology to combine magnesia aggregate and spinelle first Magnesia aggregate is surface-treated, so that there are one between aggregate and aggregate, aggregate and matrix in magnesia-spinel brick after molding Layer carbon black thin layer flexible, rather than direct contact condition, to largely reduce the elasticity modulus of magnesia-spinel brick And thermal expansion coefficient, improve its antistrip performance.
In addition, there are metal Al powder and simple substance Si powder in magnesia-spinel brick matrix, and at high temperature, metal Al powder and simple substance Si Powder can occur ceramics with the carbon black of aggregate surface and react, and generate Al in aggregate surface4C3, ceramic phases, the optimization such as AlN and SiC produces The microstructure of product can also reduce the thermal expansion coefficient of aggregate to a certain extent, improve antistrip performance.Traditional mixes Material technique, the ceramics reaction of metal and carbon all occurs in matrix substantially under high temperature, and effect of the invention is not achieved.
The secondary raw material of RH furnace magnesia-spinel brick is magnesium aluminate spinel, 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.
It is generally bound directly between the crystal grain of conventional magnesia or by dicalcium silicate, tricalcium silicate, monticellite Or the objects such as manganolite combine, 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 object, which is mutually distributed, to be avoid or reduced Direct contact between periclase crystal grain, reduces the thermal expansion coefficient of aggregate, and high content of MgO and dystectic spinelle Its good alkali resistance scouring performance is also ensured in conjunction with phase (2135 DEG C of aluminum-spinel fusing point).
The beneficial effects of the present invention are:
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 expansion coefficient that product is reduced in big degree, improves the antistrip performance of magnesia-spinel brick.
2) using spinelle combination magnesia as aggregate, thermal expansion coefficient is lower than magnesia, and alkali resistance scouring performance It is better than magnesium aluminate spinel, thus its thermal expansion coefficient is also reduced while guarantee magnesia-spinel brick good slag resistance, change It has been apt to antistrip performance.
Magnesia-spinel brick provided by the invention is applied to RH inner lining of furnace, uses under same working condition than currently on the market Magnesia-spinel brick have better antistrip performance, thus have longer service life.Magnesia spinel provided by the invention Brick can be also widely applied to refining ladle molten bath and packet bottom region.
Detailed description of the invention
Fig. 1 is the aggregate surface shape without the magnesia-spinel brick of the aggregate production of carbon black modified processing after high-temperature process Looks；
Fig. 2 is aggregate surface shape of the magnesia-spinel brick of the aggregate production by carbon black modified processing after high-temperature process Looks.
Specific embodiment
Embodiment 1
A kind of magnesia-spinel brick that antistrip performance is excellent, is produced as follows:
1) 5~3mm, 3~1mm, the magnesia aggregate of 1~0mm and spinelle combination magnesia aggregate are weighed simultaneously according to the ratio in Table 1 The N220 type carbon black for accounting for its total amount 0.3% is added in mixing, and 20min is blended in the ball mill that revolving speed is 30r/min, makes nanometer The carbon black of partial size is sufficiently wrapped in the particle surface of magnesia aggregate and spinelle combination magnesia aggregate.
Wherein, spinelle combination magnesia the preparation method comprises the following steps: the light-burning magnesium powder and Al of MgO >=95%2O3>=98.5% industry After alumina powder is weighed by weight 87:13, pressure ball is ground altogether, is calcined in shaft furnace through 1850 DEG C.
2) by Spinel micropowder, metal Al powder, simple substance Si powder and B4C fine powder weigh according to the ratio in Table 1 after in cone mixer Or it is uniformly mixed in edge runner, the premixed powder as magnesia-spinel brick.
3) after magnesia particle, the spinelle combination magnesia particle of surface soot package modification being weighed according to the ratio in Table 1, Be put into kolleroang and stir 1min, it is outer be added 3% lignin liquor stir 2min, then be added magnesia powder (granularity≤ 0.088mm) and premixed powder continues to stir 15min, mixes well aggregate, magnesia powder and premixed powder.
4) by mixed pug high-pressure molding in a mold, then into tunnel oven in 180~200 DEG C of heat preservation 8h up at Product.
1 embodiment of table, 1 raw material proportioning
Embodiment 2
A kind of magnesia-spinel brick that antistrip performance is excellent, is produced as follows:
1) 5~3mm, 3~1mm, the magnesia aggregate of 1~0mm and spinelle combination magnesia aggregate are weighed simultaneously in 2 ratio of table The N550 type carbon black for accounting for its total amount 0.5% is added in mixing, and 35min is blended in the ball mill that revolving speed is 25r/min, makes nanometer The carbon black of partial size is sufficiently wrapped in particle surface.
Wherein, spinelle combination magnesia the preparation method comprises the following steps: the light-burning magnesium powder and Al of MgO >=95%2O3>=98.5% industry After alumina powder is weighed by weight 87:13, pressure ball is ground altogether, is calcined in shaft furnace through 1850 DEG C.
2) by Spinel micropowder, metal Al powder, simple substance Si powder and B4C fine powder in 2 ratio of table weigh after in cone mixer Or it is uniformly mixed in edge runner, the premixed powder as magnesia-spinel brick.
3) after the magnesia particle of surface soot package modification, spinelle combination magnesia particle being weighed in 2 ratio of table, Be put into kolleroang and stir 1min, outer 2% phenolic resin of being added stirs 2min, be then added magnesia powder and premixed powder after Continuous stirring 20min, mixes well aggregate, magnesia powder and premixed powder.
4) by mixed pug high-pressure molding in a mold, then into tunnel oven in 180~200 DEG C of heat preservation 8h up at Product.
2 embodiment of table, 2 ingredient proportion
Embodiment 3
A kind of magnesia-spinel brick that antistrip performance is excellent, is produced as follows:
1) by 5~3mm, 3~1mm, the magnesia aggregate of 1~0mm and spinelle combination magnesia aggregate each granularity sand With the N880 type carbon black for accounting for the granularity sand 0.8%, 40min is blended in the ball mill that revolving speed is 20r/min, makes nanometer particle size Carbon black is sufficiently wrapped in particle surface.
Wherein, spinelle combination magnesia the preparation method comprises the following steps: the light-burning magnesium powder and Al of MgO >=95%2O3>=98.5% industry After alumina powder is weighed by weight 87:13, pressure ball is ground altogether, milling body altogether is directly melted in electric arc furnaces, crystallisation by cooling obtains.
2) by Spinel micropowder, metal Al powder, simple substance Si powder and B4C fine powder in 3 ratio of table weigh after in cone mixer Or it is uniformly mixed in edge runner, the premixed powder as magnesia-spinel brick.
3) after the magnesia particle of surface soot package modification, spinelle combination magnesia particle being weighed in 3 ratio of table, It is put into kolleroang and stirs 1min, the magnesium aluminate cementing agent of outer addition 3.5% stirs 1min, then the water stirring of outer addition 2% 3min, is then added magnesia powder and premixed powder continues to stir 15min, keeps aggregate, magnesia powder and premixed powder sufficiently mixed It is even.
4) by mixed pug high-pressure molding in a mold, then into tunnel oven in 180~200 DEG C of heat preservation 8h up at Product.
3 embodiment of table, 3 ingredient proportion
Comparative example 1
A kind of magnesia-spinel brick that antistrip performance is excellent, is produced as follows:
1) by Spinel micropowder, metal Al powder, simple substance Si powder and B4C fine powder in 4 ratio of table weigh after in cone mixer Or it is uniformly mixed in edge runner, the premixed powder as magnesia-spinel brick.
2) by fused magnesite particle in 4 ratio of table weigh after, be put into kolleroang and stir 1min, it is outer be added 3% it is wooden Plain solution stirs 2min, and fused magnesite fine powder (granularity≤0.088mm) is then added and premixed powder continues to stir 15min, makes Aggregate, magnesia powder and premixed powder mix well.
3) by mixed pug high-pressure molding in a mold, then into tunnel oven in 180~200 DEG C of heat preservation 8h up at Product.
4 comparative example of table, 1 raw material proportioning
Performance test
The performance test results of Examples 1 to 3 are as shown in table 4.
Table 4
As can be seen from Table 4, the bulk density and intensity of each embodiment are slightly decreased because of the addition of spinelle combination magnesia, but 1600 DEG C treated that remaining linear expansivity decline is obvious, and thermal shock resistance amplification is obvious, this shows magnesium point provided by the invention Spar brick can show better antistrip performance in use.
Fig. 1 is the aggregate surface shape without the magnesia-spinel brick of the aggregate production of carbon black modified processing after high-temperature process Looks；Fig. 2 is aggregate surface pattern of the magnesia-spinel brick of the aggregate production by carbon black modified processing after high-temperature process.By scheming 1, Fig. 2, which can be seen that, carries out surface modification treatment to magnesia aggregate and spinelle combination magnesia aggregate using carbon-enwrap technology, 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, To largely reduce the thermal expansion coefficient of product, the antistrip performance of magnesia-spinel brick is improved.

Claims (7)

1. a kind of preparation method for the magnesia-spinel brick that antistrip performance is excellent, which is characterized in that mix each raw material and be pressed into After type, in 180~200 DEG C of heat preservation at least 8h, 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 Partial size 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 powder ≤0.045mm 0.5~2 Bonding agent —— 2~4
In table, the spinelle combination magnesia is to tie after light-burning magnesium powder and industrial alumina powder grinds altogether through calcining or electric arc furnaces fusing Crystalline substance obtains；In the spinelle combination magnesia, content of MgO is 85~90%, Al2O3Content is 10~15%, and spinelle fills completely It fills between the crystal boundary of periclase crystal；
It is modified that the magnesia aggregate and spinelle combination magnesia aggregate pass through carbon blacksurface；The carbon blacksurface is modified specific Operation are as follows:
Magnesia aggregate and/or spinelle combination magnesia aggregate are put into ball mill and are ground altogether with carbon black, the additional amount of the carbon black It is the 0.2~0.8% of aggregate quality to be modified.
2. the preparation method of the excellent magnesia-spinel brick of antistrip performance as described in claim 1, which is characterized in that use charcoal When black progress aggregate surface modification, the revolving speed of ball mill is 20~30r/min, and Ball-milling Time is 30~45min.
3. the preparation method of the excellent magnesia-spinel brick of antistrip performance as described in claim 1, which is characterized in that magnesia bone Material is magnesite clinker or fused magnesite, and content of MgO is greater than 97% in magnesia aggregate.
4. the preparation method of the excellent magnesia-spinel brick of antistrip performance as described in claim 1, which is characterized in that the charcoal Black model N220~N880.
5. the preparation method of the excellent magnesia-spinel brick of antistrip performance as described in claim 1, which is characterized in that the knot Mixture be one of lignin liquor, phenolic resin, magnesium aluminate cementing agent, wherein in magnesium aluminate cementing agent MgO quality hundred Score >=50%, partial size are≤0.088mm.
6. the preparation method of the excellent magnesia-spinel brick of antistrip performance as described in claim 1, which is characterized in that carry out former When material mixing, first by Spinel micropowder, metal Al powder, simple substance Si powder and B4C fine powder is pre-mixed；Then premixing is produced Object is uniformly mixed with remaining raw material.
7. a kind of magnesia-spinel brick that antistrip performance is excellent, which is characterized in that using as described in any one of claim 1~6 Preparation method be prepared.
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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
CN113968724B (en) * 2021-10-29 2023-01-24 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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