CN114478030A - Preparation method of multi-shape coexisting MgAlON refractory material for RH refining furnace - Google Patents
Preparation method of multi-shape coexisting MgAlON refractory material for RH refining furnace Download PDFInfo
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- 239000011819 refractory material Substances 0.000 title claims abstract description 60
- 238000007670 refining Methods 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 43
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 43
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 43
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 43
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 35
- 239000000203 mixture Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 28
- 239000011159 matrix material Substances 0.000 claims abstract description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 18
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000012299 nitrogen atmosphere Substances 0.000 claims abstract description 8
- 239000011449 brick Substances 0.000 claims abstract description 7
- 239000007767 bonding agent Substances 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 29
- 239000002994 raw material Substances 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 10
- 239000011777 magnesium Substances 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- -1 magnesium aluminate Chemical class 0.000 claims description 8
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 6
- 239000005011 phenolic resin Substances 0.000 claims description 6
- 229920001568 phenolic resin Polymers 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 230000005418 spin wave Effects 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims 1
- 239000000758 substrate Substances 0.000 claims 1
- 230000035939 shock Effects 0.000 abstract description 10
- 239000002893 slag Substances 0.000 abstract description 10
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 7
- 238000004321 preservation Methods 0.000 abstract description 7
- 230000003628 erosive effect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract description 3
- 229910052566 spinel group Inorganic materials 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract 1
- 239000011029 spinel Substances 0.000 description 11
- 229910052596 spinel Inorganic materials 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 229910003023 Mg-Al Inorganic materials 0.000 description 3
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- NAXKFVIRJICPAO-LHNWDKRHSA-N [(1R,3S,4R,6R,7R,9S,10S,12R,13S,15S,16R,18S,19S,21S,22S,24S,25S,27S,28R,30R,31R,33S,34S,36R,37R,39R,40S,42R,44R,46S,48S,50R,52S,54S,56S)-46,48,50,52,54,56-hexakis(hydroxymethyl)-2,8,14,20,26,32,38,43,45,47,49,51,53,55-tetradecaoxa-5,11,17,23,29,35,41-heptathiapentadecacyclo[37.3.2.23,7.29,13.215,19.221,25.227,31.233,37.04,6.010,12.016,18.022,24.028,30.034,36.040,42]hexapentacontan-44-yl]methanol Chemical compound OC[C@H]1O[C@H]2O[C@H]3[C@H](CO)O[C@H](O[C@H]4[C@H](CO)O[C@H](O[C@@H]5[C@@H](CO)O[C@H](O[C@H]6[C@H](CO)O[C@H](O[C@H]7[C@H](CO)O[C@@H](O[C@H]8[C@H](CO)O[C@@H](O[C@@H]1[C@@H]1S[C@@H]21)[C@@H]1S[C@H]81)[C@H]1S[C@@H]71)[C@H]1S[C@H]61)[C@H]1S[C@@H]51)[C@H]1S[C@@H]41)[C@H]1S[C@H]31 NAXKFVIRJICPAO-LHNWDKRHSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910017083 AlN Inorganic materials 0.000 description 1
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NACUKFIFISCLOQ-UHFFFAOYSA-N [Mg].[Cr] Chemical compound [Mg].[Cr] NACUKFIFISCLOQ-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
-
- 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
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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
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
-
- 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)
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- 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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
- C04B2235/524—Non-oxidic, e.g. borides, carbides, silicides or nitrides
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
Abstract
The invention relates to a refractory product in the field of refractory materials, in particular to a preparation method of a multi-morphology coexisting MgAlON refractory material for an RH refining furnace, which takes magnesite grains as aggregate, takes a mixture of active alumina powder, metal aluminum powder and magnesite fine powder as a matrix, is added with a bonding agent to be uniformly mixed, then is mixed and molded by dry pressing, then is dried, the dried brick blank is put into a high-temperature furnace in nitrogen atmosphere for heat preservation, the furnace temperature is naturally cooled to normal temperature, the multi-morphology coexisting MgAlON refractory material product is obtained, the granular, shell, sheet and fibrous MgAlON spinels reduce the pore diameters and are distributed in the matrix in a cross way, thereby being beneficial to the permeation of steel slag and improving the thermal shock stability of the material, and the combined action of the granular, shell, sheet and fibrous MgAlON spinels can improve the erosion resistance, the permeation resistance and the thermal shock stability of the prepared multi-morphology coexisting MgAlON refractory material, can replace magnesia chrome brick refractory materials to be used at key parts in an RH refining furnace, and improves the service life of the RH refining furnace.
Description
Technical Field
The invention relates to a refractory product in the field of refractory materials, in particular to a preparation method of a multi-shape coexisting MgAlON refractory material for an RH refining furnace.
Background
The MgAlON is a magnesium aluminum oxynitride MgAlON, a novel refractory material, a MgAlON refractory material and MgO-Y2O3、MgO-C、MgO-ZrO2Refractory materials such as MgO-CaO are currently a chromium-free refractory material which has been studied in RH refining furnaces. MgO-Y2O3The refractory material has better steel slag penetration resistance, poorer spalling resistance compared with a magnesium-chromium refractory material, and in addition, Y2O3Belongs to rare earth oxide, and has high price and high use cost; the MgO-C refractory material has excellent anti-stripping performance and steel slag corrosion resistance, but is not suitable for smelting low-carbon steel and ultra-low-carbon steel due to the introduction of a carbon source in the raw materials, and carbon can reduce part of MgO in a high-temperature vacuum environment, so that the material is loosened, and the steel slag corrosion resistance of the material is reduced; MgO-ZrO2ZrO in refractories2The addition of (A) can improve the steel slag erosion resistance of the refractory material, and ZrO can be formed during the sintering process2The volume effect accompanying the phase transition may cause microcracks to form MgO-ZrO2The thermal shock resistance of the refractory material is improved, but because of ZrO2The price of the product is high, and the production cost is high; the MgO-CaO refractory material has the advantages of high temperature resistance, steel slag erosion resistance, thermal shock resistance, molten steel essence and the like, and has the defects that free CaO in the material is hydrated, and the MgO-CaO refractory material is pulverized and loses efficacy due to the volume effect generated in the hydration process.
The MgAlON refractory material belongs to a Mg-Al refractory material, and is different from a Mg-Al spinel refractory material in that nitrogen is introduced into the material, aluminum nitride generated by in-situ reaction is dissolved into magnesia or Mg-Al spinel to obtain the MgAlON spinel phase-containing refractory material, and compared with other chromium-free refractory materials, the MgAlON refractory material has better mechanical property, slag corrosion resistance and thermal shock stability due to the special micro-morphology, and the MgAlON refractory material becomes one direction for researching the chromium-free refractory material for an RH refining furnace by relevant researchers at present.
Research shows that the granular ceramic reinforcement plays roles of dispersion toughening, crack bridging and the like relative to the matrix of the composite refractory material, and improves the mechanical property of the composite refractory material; the flaky or fibrous ceramic phase can absorb and consume the energy of crack propagation, so as to achieve the purpose of improving the thermal shock stability, while the traditional refractory material has one or two morphologies in a microstructure, so that the mechanical property and the thermal shock stability of the refractory material cannot be considered at the same time.
Disclosure of Invention
In order to solve the problems in the background art, the invention discloses a preparation method of a multi-morphology coexisting MgAlON refractory material for an RH refining furnace, and the prepared chromium-free MgAlON refractory material not only has excellent mechanical property, but also has good thermal shock stability and does not pollute the environment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a process for preparing multi-shape coexisting MgAlON refractory material for RH refining furnace includes such steps as mixing Mg sand particles as aggregate, activated alumina powder, metallic aluminium powder and Mg sand powder as matrix, adding binder to the mixture, mixing for 15-40min, press shaping, baking at 500-1000 t, putting the baked brick in high-temp furnace in nitrogen atmosphere, holding at 500-700 deg.C for 2-10 hr, holding at 1400-1700 deg.C for 2-6 hr, and natural cooling2O3Adding metal aluminum powder into MgO refractory material, placing the MgO refractory material in nitrogen atmosphere, performing low-temperature nitridation treatment to form an aluminum nitride or aluminum oxide protective shell on the surface of the metal aluminum, and enabling the metal aluminum to be in a gaseous Al state in a high-temperature nitrogen environment2Overflow of O/Al form with gaseous Mg and N2、O2Reacting to produce flaky and fibrous MgAlON, and solid dissolving the aluminum nitride protective shell and spinel to form shellThe MgAlON, other aluminium nitride and granular spinel in the matrix are solid-dissolved to produce granular MgAlON, and the granular, shell, sheet and fibrous MgAlON spinel is cross-distributed in the matrix.
Further, in the preparation method of the multi-morphology coexisting magnesite allin refractory material for the RH refining furnace, the magnesite in the aggregate is one or a mixture of more of electric melting magnesite, sintered magnesite or high-purity magnesite, and the particle sizes of the magnesite in the aggregate in the raw material mixture are respectively as follows: 5-3mm, 3-1mm and 1-0mm, and the weight fraction of each granularity magnesite grain is as follows: 5-20 wt%, 10-40 wt% and 15-35 wt%, and the MgO content in the aggregate magnesite is 95-98%.
Further, the preparation method of the multi-morphology coexisting MgAlON refractory material for the RH refining furnace comprises the following steps of enabling the weight fraction of the metal aluminum powder in the matrix in the raw material mixture to be 5-15 wt%, enabling the particle size of the metal aluminum powder to be less than or equal to 74 mu m, and enabling the Al content in the metal aluminum powder to be 99-99.9%.
Further, in the preparation method of the multi-morphology coexisting magnesite Allone refractory material for the RH refining furnace, the magnesite fine powder in the matrix is one or more of electric melting magnesite, high-purity magnesite and sintered magnesite, the weight percentage of the magnesite fine powder in the raw material mixture is 5-20 wt%, the granularity of the magnesite fine powder is less than or equal to 74 mu m, and the MgO content in the magnesite fine powder is 95-98%.
Further, the preparation method of the multi-morphology coexisting MgAlON refractory material for the RH refining furnace comprises the following steps of enabling the weight fraction of active alumina powder in a matrix in a raw material mixture to be 2-8 wt%, enabling the particle size of the active alumina powder to be less than or equal to 5 mu m, and enabling Al in the active alumina powder to be2O3The content is 97-99.9%.
Further, in the preparation method of the multi-morphology coexisting MgAlON refractory material for the RH refining furnace, the binding agent is one or more of pulp waste liquid, phenolic resin and magnesium aluminate sol, and the weight fraction of the binding agent in the raw material mixture is 2-5 wt%.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to a preparation method of a multi-morphology coexisting MgAlON refractory material for an RH refining furnace, which is used for preparing the multi-morphology coexisting MgAlON refractory materialContains several different types of spinels: magnesium aluminate spinel, granular, shell, flake and fibrous MgAlON spinel, magnesium oxide and MgAlON spinel combined phase absorbing Fe in molten steel or slag2+、Mn2+、Cr3+The corresponding solid solution transition layer is formed, the structure of the material and the components contacting with the slag are changed, the granular, shell, sheet and fibrous MgAlON spinel reduce the pore diameter of pores, are distributed in the matrix in a crossed manner, are beneficial to the penetration of steel slag, and can also improve the thermal shock stability of the material, and the combined action of the granular, shell, sheet and fibrous MgAlON spinel improves the erosion resistance, penetration resistance and thermal shock stability of the prepared MgAlON refractory material with coexisting morphologies, can replace a key part of a MgCr brick refractory material used in an RH refining furnace, and improves the service life of the RH refining furnace.
Drawings
FIG. 1 is a photograph of a polymorphic coexisting MgAlON microstructure.
Detailed Description
Example 1
A preparation method of a multi-shape coexisting MgAlON refractory material for an RH refining furnace comprises the steps of uniformly mixing aggregate magnesite particles, a matrix and a magnesium aluminate sol bonding agent with the weight percentage of 4% to form a raw material mixture, wherein the magnesite particles in the aggregate are fused magnesite with the purity of 96%, the magnesite particles with the particle size of 5-3mm are 11 wt%, the magnesite particles with the particle size of 3-1mm are 30 wt%, the magnesite particles with the particle size of 1-0mm are 30 wt%, the matrix is a mixture of metal aluminum powder with the particle size of less than or equal to 74 mu m, the fused magnesite with the weight percentage of 13 wt%, the purity of 96% and active aluminum oxide with the particle size of less than or equal to 5 mu m, the weight percentage of 6 wt% and the purity of 99.4%, and the fused magnesite particles, the metal aluminum and the active aluminum oxide are weighed according to the ratio, Mixing the mixed matrix raw materials of fused magnesia and activated alumina, mixing for 30min by taking magnesium aluminate sol as a bonding agent, carrying out dry pressing and forming in a 650t press, then placing the green brick into a drying box for drying treatment, placing the dried green body into a high-temperature furnace in nitrogen atmosphere, carrying out heat preservation for 5h at 500 ℃, carrying out heat preservation for 3h at the sintering temperature of 1600 ℃, and preparing the multi-morphology coexisting magnesia-alumina refractory material product after the furnace temperature is reduced to the normal temperature.
Example 2
A preparation method of a multi-morphology coexisting MgAlON refractory material for an RH refining furnace is characterized in that aggregate magnesite particles, a matrix and a binding agent pulp waste liquid with the weight percentage content of 4.5% are uniformly mixed to form a raw material mixture, wherein the magnesite particles in the aggregate are sintered magnesite with the purity of 98%: the mass percentage of the magnesite grains with the granularity of 5-3mm is 12 wt%, the mass percentage of the magnesite grains with the granularity of 3-1mm is 27 wt%, the mass percentage of the magnesite grains with the granularity of 1-0mm is 32 wt%, and the matrix is as follows: the mixture of metal aluminum powder with the granularity of less than or equal to 74 microns, the weight percentage content of 12 wt% and the purity of 99.3% and sintered magnesia with the granularity of less than or equal to 74 microns, the weight percentage content of 10 wt% and the purity of 98% and active alumina powder with the granularity of less than or equal to 5 microns, the weight percentage content of 7 wt% and the purity of 99.4% is weighed according to the proportion, the raw material of the fused magnesia particles, the metal aluminum powder, the sintered magnesia and the active alumina powder matrix are uniformly mixed, the paper pulp waste liquid is used as a bonding agent for mixing for 35min, the mixture is subjected to dry pressing and forming in a 1000t press, the green body is placed in a drying oven for drying treatment, the dried green body is placed in a high-temperature furnace in nitrogen atmosphere, the temperature is maintained at 600 ℃ for 8h, the temperature is maintained at the sintering temperature of 1500 ℃ for 4h, and the magnon refractory material product with various appearances can be prepared after the furnace temperature is reduced to normal temperature.
Example 3
A preparation method of a multi-morphology coexisting MgAlON refractory material for an RH refining furnace comprises the steps of uniformly mixing aggregate particles, a matrix and 3.5 wt% of binding agent phenolic resin to form a raw material mixture, wherein the magnesia particles in the aggregate are high-purity magnesia with the purity of 97%, the magnesia particles with the granularity of 5-3mm are 9 wt%, the magnesia particles with the granularity of 3-1mm are 33 wt%, the magnesia particles with the granularity of 1-0mm are 29 wt%, and the matrix is: the method comprises the following steps of weighing a mixture of metal aluminum powder with the granularity of less than or equal to 74 microns, the mass percentage content of 9 wt%, the purity of 99.3% and high-purity magnesite with the granularity of less than or equal to 74 microns, the mass percentage content of 12 wt%, the purity of 97.8% and active alumina powder with the granularity of less than or equal to 5 microns, the mass percentage content of 8 wt% and the purity of 99.4% according to the proportion, mixing the high-purity magnesite particle raw material, the metal aluminum powder, the high-purity magnesite fine powder and the active alumina powder matrix raw material by taking phenolic resin as a binding agent for 25min, carrying out dry pressing forming on the mixture in a 1000t press, placing a green body into a drying box for drying treatment, placing the dried green body into a high-temperature furnace in a nitrogen atmosphere, carrying out heat preservation for 10h at 700 ℃, carrying out heat preservation for 5h at the sintering temperature of 1400 ℃, and carrying out furnace temperature reduction to the normal temperature to obtain the product.
Example 4
A preparation method of a multi-shape coexisting MgAlON refractory material for an RH refining furnace is characterized in that aggregate particles, a matrix, and a phenolic resin and magnesium aluminate sol composite binder with the weight percentage content of 3% and 2% respectively are uniformly mixed to form a raw material mixture, wherein the magnesia particles in the aggregate are respectively fused magnesia with the purity of 95%, sintered magnesia with the purity of 97% and a high-purity magnesia with the purity of 98%, the fused magnesia with the granularity of 5-3mm is 10 wt%, the sintered magnesia with the granularity of 3-1mm is 30 wt%, the high-purity magnesia with the granularity of 1-0mm is 31 wt%, and the matrix is: the method comprises the following steps of weighing a mixture of metal aluminum powder with the granularity of less than or equal to 74 microns, high-purity magnesite with the mass percentage of 8 wt% and the purity of 99.3% and high-purity activated alumina powder with the granularity of less than or equal to 74 microns, the mass percentages of 6 wt% and 9 wt% respectively and the purity of 98% respectively and 97% respectively and active alumina powder with the granularity of less than or equal to 5 microns, the mass percentage of 6 wt% and the purity of 99.4%, mixing phenolic resin and magnesium aluminate sol serving as a composite bonding agent for 28min, carrying out dry pressing on the mixture in a 1000t press, placing a green blank into a drying box for drying treatment, placing the dried blank into a high-temperature furnace in a nitrogen atmosphere, carrying out heat preservation at 610 ℃ for 9h, carrying out heat preservation at the sintering temperature of 1650 ℃ for 6h, and cooling the furnace temperature to normal temperature to prepare the product.
The physical and chemical performance indexes of the multi-morphology coexisting MgAlON refractory material prepared by the invention are as follows:
Claims (6)
1. a preparation method of a multi-shape coexisting MgAlON refractory material for an RH refining furnace is characterized by comprising the following steps of: the preparation method comprises the steps of taking magnesia particles as aggregates, taking a mixture of active alumina powder, metal aluminum powder and magnesia fine powder as a matrix, adding a bonding agent into the mixture of the aggregates and the matrix to obtain a raw material mixture, mixing uniformly, mixing for 15-40min, performing dry pressing molding in a press of 650-1000 t, placing a brick blank into a drying kiln for drying treatment, placing the dried brick blank into a high-temperature furnace in a nitrogen atmosphere, preserving heat for 2-10h at the temperature of 500-700 ℃, preserving heat for 2-6h at the sintering temperature of 1400-1700 ℃, and naturally cooling the furnace temperature to normal temperature to obtain the magnon refractory material product with coexisting multiple morphologies.
2. The method for preparing a multi-morphology coexisting MgAlON refractory material for RH refining furnaces as set forth in claim 1, wherein: the magnesite in the aggregate is one or a mixture of more of electric melting magnesite, sintered magnesite or high-purity magnesite, and the particle sizes of the aggregate magnesite respectively are as follows: 5-3mm, 3-1mm and 1-0mm, and the weight fraction of each granularity magnesite grain in the raw material mixture is as follows: 5-20 wt%, 10-40 wt% and 15-35 wt%, and the MgO content in the aggregate magnesite is 95-98%.
3. The method for preparing a multi-morphology coexisting MgAlON refractory material for RH refining furnaces as set forth in claim 1, wherein: the weight percentage of the metal aluminum powder in the matrix in the raw material mixture is 5-15 wt%, the granularity of the metal aluminum powder is less than or equal to 74 mu m, and the Al content in the metal aluminum powder is 99-99.9%.
4. The method for preparing a multi-morphology coexisting MgAlON refractory material for RH refining furnaces as set forth in claim 1, wherein: the fine magnesia powder in the matrix is one or more of fused magnesia, high-purity magnesia and sintered magnesia, the weight fraction of the fine magnesia powder in the raw material mixture is 5-20 wt%, the granularity of the fine magnesia powder is less than or equal to 74 mu m, and the MgO content in the fine magnesia powder is 95-98%.
5. The method for preparing a multi-morphology coexisting MgAlON refractory material for RH refining furnaces as set forth in claim 1, wherein: the weight percentage of active alumina powder in the substrate in the raw material mixture is 2-8 wt%, the particle size of the active alumina powder is less than or equal to 5 mu m, and Al in the active alumina powder2O3The content is 97-99.9%.
6. The method for preparing a multi-morphology coexisting MgAlON refractory material for RH refining furnaces as set forth in claim 1, wherein: the binder is one or more of pulp waste liquid, phenolic resin and magnesium aluminate sol, and the weight fraction of the binder in the raw material mixture is 2-5 wt%.
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