CN116283315A - Carbon-free inorganic pressed spinel sliding plate brick and preparation method thereof - Google Patents
Carbon-free inorganic pressed spinel sliding plate brick and preparation method thereof Download PDFInfo
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- CN116283315A CN116283315A CN202211731565.8A CN202211731565A CN116283315A CN 116283315 A CN116283315 A CN 116283315A CN 202211731565 A CN202211731565 A CN 202211731565A CN 116283315 A CN116283315 A CN 116283315A
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- 239000011029 spinel Substances 0.000 title claims abstract description 83
- 229910052596 spinel Inorganic materials 0.000 title claims abstract description 83
- 239000011449 brick Substances 0.000 title claims abstract description 54
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 76
- 239000000843 powder Substances 0.000 claims abstract description 60
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910052751 metal Inorganic materials 0.000 claims abstract description 34
- 239000002184 metal Substances 0.000 claims abstract description 34
- 238000005245 sintering Methods 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 27
- 239000011230 binding agent Substances 0.000 claims abstract description 25
- 150000004676 glycans Chemical class 0.000 claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 21
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 20
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 19
- 239000012267 brine Substances 0.000 claims abstract description 18
- 238000000227 grinding Methods 0.000 claims abstract description 18
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims abstract description 18
- 229920001282 polysaccharide Polymers 0.000 claims abstract description 17
- 239000005017 polysaccharide Substances 0.000 claims abstract description 17
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 17
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000005121 nitriding Methods 0.000 claims abstract description 15
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 14
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 13
- 239000002131 composite material Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 26
- 238000001035 drying Methods 0.000 claims description 13
- 238000010304 firing Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 239000000292 calcium oxide Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 6
- 229920002307 Dextran Polymers 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 239000000047 product Substances 0.000 claims description 5
- 239000007767 bonding agent Substances 0.000 claims description 4
- 239000004615 ingredient Substances 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical class [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical class [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 2
- 229920002000 Xyloglucan Polymers 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 abstract description 11
- 239000011819 refractory material Substances 0.000 abstract description 8
- 230000035939 shock Effects 0.000 abstract description 7
- 238000003723 Smelting Methods 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- 235000012245 magnesium oxide Nutrition 0.000 description 16
- 230000003628 erosive effect Effects 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 239000011575 calcium Substances 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- 238000005266 casting Methods 0.000 description 6
- 238000011065 in-situ storage Methods 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- -1 aluminum zirconium carbon Chemical compound 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000007580 dry-mixing Methods 0.000 description 2
- 238000010952 in-situ formation Methods 0.000 description 2
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 229910021386 carbon form Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
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- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/14—Closures
- B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
- B22D41/28—Plates therefor
- B22D41/30—Manufacturing or repairing thereof
- B22D41/32—Manufacturing or repairing thereof characterised by the materials used therefor
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- 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
- C04B35/44—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 aluminates
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Abstract
The invention discloses a carbon-free inorganic spinel sliding plate brick and a preparation method thereof, and belongs to the technical field of refractory materials. The sliding plate brick comprises the following components in percentage by mass: 57-65% of sintering spinel particles, 1-5% of silicon carbide particles, 35-40% of co-milled powder, 100% of total percentage and 3-5% of binding agent, wherein the binding agent is prepared from polysaccharide and brine according to the weight ratio of 1:2, wherein the co-grinding powder is prepared by mixing 6 to 17 percent of sintering spinel fine powder, 5 to 10 percent of fused magnesia powder, 10 to 15 percent of metal aluminum powder and 2 to 6 percent of alpha-Al 2 O 3 The micro powder and 1 to 3 percent of metal silicon powder are evenly mixed to prepare the composite material. The invention uses glycan and brine as binding agent, and adopts high-temperature nitriding to fix free carbon source, so as to produce reinforcing phase, and raise high-temperature strength, anti-erosion property and anti-corrosion property of slide plateThe thermal shock performance and the service life are suitable for smelting the ultra-low carbon steel grade.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a carbon-free inorganic spinel sliding plate brick and a preparation method thereof.
Background
The slide brick is a key component for controlling the flow rate and the flow velocity of molten steel in the continuous casting process, and the quality of the performance of the slide brick directly influences the continuous casting process and the quality of steel billets. Therefore, the sliding plate brick is required to have excellent erosion resistance, thermal shock resistance, molten steel scouring resistance and other characteristics. When casting high corrosiveness steel types such as calcium treated steel, high oxygen steel, al killed steel and the like, the common aluminum carbon sliding plate and the aluminum zirconium carbon have serious melting loss, and the durability is obviously reduced. The alkaline material has the advantage of CaO corrosion resistance, but the excellent corrosion resistance is weakened due to the large thermal expansion coefficient and limited strength, so that the repeated use of the alkaline skateboard is limited. Because of the existence of graphite, the alkaline sliding plate is difficult to wet by slag, has high thermal conductivity and can alleviate stress, so that the higher carbon content effectively ensures the stability and safety of the service life of the alkaline sliding plate. With the change of domestic supply and demand relations, the productivity of low carbon steel and ultra low carbon steel of domestic iron and steel enterprises is continuously increased. The reduction of the carbon content can affect the performance of the skateboard, and further affect the durability of the skateboard.
The casting molding process of the conventional spinel sliding plate brick has low production efficiency because of only dozens of blocks per casting. Carbon is introduced in the preparation process, and the patent CN111662090A discloses a magnesia-alumina spinel-silicon carbide particle-aluminum composite refractory material. Which comprises aggregate and matrix; the aggregate is fused magnesia-alumina spinel particles and sintered magnesia-alumina spinel particles, and the addition amount of the fused magnesia-alumina spinel particles and the sintered magnesia-alumina spinel particles is 50% -70% of the total amount of the raw materials; the matrix is silicon carbide particles, aluminum oxide and magnesium oxide; the matrix is also added with coated metal aluminum powder, and the addition proportion is 2-8% of the total mass of the raw materials; and uniformly mixing the aggregate, the matrix and the bonding agent, performing mechanical pressing molding, drying, and sintering under a carbon-embedded atmosphere to obtain the magnesia-alumina spinel-silicon carbide particle-aluminum composite refractory material. Wherein the binder is a resin organic binder, and is one of amino water-soluble resin and phenolic resin. In addition, patent CN106565249a discloses a quartz refractory material, which comprises the following components in parts by weight: 135-169 parts of quartz sand; 10-20 parts of boric acid; 10-15 parts of lignin-sugar composition; 15-20 parts of phenolic resin; 45-60 parts of zirconia; 20-25 parts of magnesium silicate; 20-30 parts of sodium silicate; 90-125 parts of magnesium oxide; 90-125 parts of calcium oxide. The quartz refractory material provided by the invention adopts the lignin-sugar composition to partially replace phenolic resin as the adhesive of the refractory material, and has good adhesive effect when applied to the field of refractory materials. However, the above binders are introduced with resin, and the carbon content of the resin is high, so that the resin is used in a steel casting environment of calcium-treated steel, and can cause carburetion and side effects on molten steel.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that the existing bonding agent is too much in introduced carbon content to cause carburetion and thus produce side effect on molten steel, the invention provides the carbon-free inorganic pressed spinel sliding plate brick and the preparation method thereof.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the carbon-free inorganic spinel pressed sliding brick is characterized by comprising the following components in percentage by mass: 57-65% of sintering spinel particles, 1-5% of silicon carbide particles, 35-40% of co-milled powder, 100% of total percentage and 3-5% of binding agent. Wherein the co-grinding powder consists of 6 to 17 percent of sintering spinel fine powder, 5 to 10 percent of fused magnesia powder, 10 to 15 percent of metal aluminum powder and 2 to 6 percent of alpha-Al 2 O 3 The micro powder and 1 to 3 percent of metal silicon powder are evenly mixed to prepare the composite material.
The binding agent is polysaccharide and brine according to the weight ratio of 1:2, mixing the materials in proportion; wherein the polysaccharide is one of dextran, xyloglucan and hydroxymethyl dextran, and has the appearance of white or light yellow solid, DE value not less than 100, pH value of 4.0-7.0, and solid matter: more than or equal to 80 percent; the brine is saturated magnesium sulfate solution or saturated magnesium chloride solution. The polysaccharide has initial viscosity at normal temperature and can be used as a binding agent of a shaping product, and after drying, the polysaccharide is decomposed to form a carbon grid mechanism, so that the polysaccharide has dry strength, and the decomposed carbon in the nitriding sintering process reacts to produce a reinforcing phase; the brine has initial forming strength after being mixed with the polysaccharide at normal temperature, and is decomposed to form periclase reinforcing phase in the sintering process, so that the brine is a good inorganic bonding agent.
Preferably, the particle size of the sintering spinel particles is (3-1, 1-0) mm, the particle size of the sintering spinel fine powder is 200 meshes, and the weight percentages of the particle sizes are as follows: 30-35% of sintered spinel particles with the particle size of 3-1 mm, 24-35% of sintered spinel particles with the particle size of 1-0 mm and 6-17% of sintered spinel fine powder with the particle size of 200 meshes; the sintered spinel fine powder comprises the following components: mgO content 74-76%, al 2 O 3 22-24% of Fe 2 O 3 The content of R is less than or equal to 0.2 percent 2 The content of O is less than or equal to 0.25 percent.
Preferably, the grain size of the fused magnesia powder is 200 meshes; the fused magnesia powder comprises the following components: mgO content is more than or equal to 97.5%, fe 2 O 3 The content of SiO is less than or equal to 0.5 percent 2 The content of CaO is less than or equal to 0.5 percent and the content of CaO is less than or equal to 1.2 percent.
Preferably, the particle size of the silicon carbide particles is 1-0 mm; the silicon carbide particles comprise: the content of SiC is more than or equal to 97 percent, fe 2 O 3 The content of (2) is less than or equal to 0.4%, the content of free carbon is less than or equal to 0.5%, the content of water is less than or equal to 0.2%, and SiO is 2 The content of (2) is less than or equal to 0.6 percent.
Preferably, the alpha-Al 2 O 3 The grain diameter of the micro powder is 5um; the alpha-Al 2 O 3 The micro powder comprises the following components: al (Al) 2 O 3 The content of Fe is more than or equal to 99 percent 2 O 3 The content of SiO is less than or equal to 0.08 percent 2 The content of R is less than or equal to 0.2 percent 2 The content of O is less than or equal to 0.25 percent.
Preferably, the particle size of the metal aluminum powder is 325 meshes; the metal aluminum powder comprises the following components: the content of Al is more than or equal to 99%, the content of active Al is more than or equal to 95%, the content of Fe is less than or equal to 0.2%, the content of Si is less than or equal to 0.2%, and the content of Cu is less than or equal to 0.1%.
Preferably, the particle size of the metal silicon powder is 325 meshes; the metal silicon powder comprises the following components: si content is not less than 98%, fe content is not more than 1%, al content is not more than 0.6%, and Ca content is not more than 1%.
The invention also aims to provide a preparation method of the carbon-free inorganic pressed spinel sliding plate brick, which comprises the following steps:
step one, granule batching: uniformly mixing sintered spinel particles with the particle size of 3-1 mm, sintered spinel particles with the particle size of 1-0 mm and silicon carbide particles with the particle size of 1-0 mm according to the weight percentage to obtain a particle ingredient;
step two, preparing co-grinding powder: the fused magnesia powder, the sintered spinel fine powder and the alpha-Al are mixed according to the weight percentage 2 O 3 Uniformly mixing the micro powder, the metal silicon powder and the metal aluminum powder to prepare co-milled powder;
step three, preparation of a binding agent: polysaccharide and brine according to 1:2, mixing for at least 2 minutes, and standing for 15 minutes after mixing;
step four, mixing: dry-mixing the granular aggregate for 1-3 minutes by a wet mill, slowly adding 3% -4% of a binding agent, wet-mixing for 3-5 minutes, adding co-milled powder, and mixing for 20-25 minutes to obtain a mixture;
step five, molding: pressing the mixture on a 1000t electric spiral brick press to form a green brick, and naturally cooling for 8 hours;
step six, drying: placing the green bricks in the middle of a drying kiln, setting the initial kiln feeding temperature to be 50 ℃, and preserving heat for 12 hours at the initial kiln feeding temperature; raising the temperature to 80 ℃, and preserving the heat at the temperature for 6 hours; raising the temperature to 120 ℃, and preserving the heat at the temperature for 12 hours; raising the temperature to 150 ℃, and preserving the heat at the temperature for 6 hours; raising the temperature to 200-220 ℃ and preserving the heat for 12 hours; the total drying time is more than 48 hours; selecting qualified semi-finished products after kiln discharge;
step seven, nitriding and sintering: nitriding and firing in a 15m shuttle kiln, heating up the kiln to 20-25 ℃/h, preserving heat for 16h at 1600-1650 ℃, firing for 80-98h, cooling for 48-60h, and opening a kiln door after cooling to below 80 ℃; nitrogen is introduced into the shuttle kiln in the sintering process;
step eight, hooping: the iron hoop is positioned in the middle, the welding seam of the iron hoop is not more than 1mm, and the gap between the iron hoop and the sliding plate is not more than 1mm;
step nine, grinding: grinding on a numerical control vertical shaft round table plane grinding machine, wherein the flatness of the working surface of the sliding plate is less than 0.05mm, and drying moisture generated in the sliding plate grinding process by using an infrared dryer;
and step ten, veneering, coating, inspecting and packaging to obtain a finished product.
In the prior art, the sliding plate brick is formed by pouring, the binding agent is generally a high carbon-containing material such as resin, but the resin exists in the components in a free carbon form after sintering, and when the sliding plate brick is applied to a steel pouring environment of calcium-treated steel, carburetion can be caused, and side effects can be caused on molten steel. Therefore, the invention adopts the mixture of the polysaccharide and the brine, and nitrogen is introduced in the high-temperature sintering process, on one hand, the brine is decomposed at high temperature and high temperature to generate periclase reinforcing phase in situ, the strength of the spinel sliding plate brick is improved, and on the other hand, excessive metal aluminum powder (10 to 15 percent) is added, and the metal aluminum, carbon sources dispersed after carbonization of the polysaccharide and N in the atmosphere are mixed in the high-temperature nitriding sintering process 2 In situ formation of non-oxide enhanced phase Al 2 Metallic aluminum in the process of OC-AlNSS and high temperature sintering simultaneously generates Al 2 O 3 The magnesium aluminate spinel reinforcing phase is further generated in situ by reacting with periclase in the matrix, the strength of the spinel sliding brick is improved through complex chemical reaction in the sintering process, the erosion resistance and the thermal shock resistance of the spinel sliding brick are effectively improved, and the easy-to-hydrate AlN and Al are reduced through the consumption of metal aluminum 4 C 3 Solves the problem that the sliding plate brick is easy to hydrate. Through high-temperature nitriding firing, carbon in the binder polysaccharide is completely converted into a non-oxide reinforcing phase in the nitriding firing process, and a carbon source is not added, so that the smelting requirement of clean steel can be met; the reinforcing phase generated in the firing process effectively improves the strength, erosion resistance and thermal shock resistance of the sliding plate brick, thereby prolonging the service life of the sliding plate brick, and compared with the common cast spinel sliding plate brick, the service life of the carbon-free inorganic pressed spinel sliding plate brick is prolonged from 1 time to more than 2.2 times.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the invention, no additional carbon source is added, carbon in the binder glycan is completely converted into a non-oxide reinforcing phase in the nitriding sintering process, and the smelting requirement of clean steel can be met;
(2) The invention takes glycan and brine as binding agents, excessive plastic metal aluminum is added, and the metal aluminum, carbon source dispersed after carbonization of the glycan and N in atmosphere are in the high-temperature nitriding firing process 2 In situ formation of non-oxide enhanced phase Al 2 Metallic aluminum in the process of OC-AlNSS and high temperature sintering simultaneously generates Al 2 O 3 Further reacts with periclase in the matrix to generate magnesia-alumina spinel reinforcing phase in situ, and through complex chemical reaction in the sintering process, not only the strength of the spinel sliding brick is improved, the erosion resistance and the thermal shock resistance of the spinel sliding brick are effectively improved, but also the AlN and Al which are easy to hydrate are reduced 4 C 3 Solves the problem that the sliding plate brick is easy to hydrate; in the use process, the large-package sleeve Al is not caused 2 O 3 To plug the casting hole;
(3) In the high-temperature sintering process, brine is decomposed to generate periclase reinforcing phase in situ, so that the strength of the spinel sliding plate brick is improved;
(4) The invention adds the metal silicon powder, and small amount of O in the metal silicon, periclase and air holes in the high-temperature nitriding sintering process 2 Generating complex chemical reaction and producing high Wen Zengjiang phase M in situ 2 S (forsterite), the erosion resistance of the skateboard is improved;
(5) According to the invention, a carbon source is not added, carbon in the binder glycan is completely converted into a non-oxide reinforcing phase in the nitriding sintering process, and the smelting requirement of clean steel can be met;
(6) The invention uses the glycan and the brine as the binding agent, can be pressed by an electric screw press, solves the problem of low production efficiency of the common spinel sliding plate brick due to casting molding, and improves the service life of the sliding plate from 1 time to more than 2.2 times.
Drawings
The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for the purpose of illustration only and thus are not limiting the scope of the present invention. Moreover, unless specifically indicated otherwise, the drawings are intended to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is an in situ produced non-oxide enhanced phase Al 2 Electron microscope photograph of OC-AlNss.
Detailed Description
The following detailed description of exemplary embodiments of the invention refers to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration exemplary embodiments in which the invention may be practiced. While these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the invention, it is to be understood that other embodiments may be realized and that various changes to the invention may be made without departing from the spirit and scope of the invention. The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely illustrative and not limiting of the invention's features and characteristics in order to set forth the best mode of carrying out the invention and to sufficiently enable those skilled in the art to practice the invention. Accordingly, the scope of the invention is limited only by the attached claims.
Example 1
The carbon-free inorganic spinel pressed sliding brick comprises the following components in percentage by mass: 65% of sintering spinel particles, 5% of silicon carbide particles, 35% of co-milled powder, 100% of total percentage and 3.5% of binding agent. The co-grinding powder consists of 17% of sintered spinel powder, 5% of fused magnesia powder, 10% of metal aluminum powder and 2% of alpha-Al 2 O 3 The micro powder and 1% of metal silicon powder are uniformly mixed to prepare the composite material. The binding agent is polysaccharide and brine according to the weight ratio of 1:2, mixing the materials in proportion; wherein the polysaccharide is dextran, the appearance of the dextran is white or light yellow solid, the DE value is more than or equal to 100, the PH value is 4.0-7.0, and the solid is: more than or equal to 80 percent; brine is a saturated magnesium sulfate solution.
The particle diameter of the sintered spinel particles is (3-1)1-0) mm, wherein the grain diameter of the sintering spinel fine powder is 200 meshes, and the weight percentages of the grain diameters are as follows: 30% of sintered spinel particles with the particle size of 3-1 mm, 35% of sintered spinel particles with the particle size of 1-0 mm and 17% of sintered spinel fine powder with the particle size of 200 meshes; the sintered spinel particles and the sintered spinel fine powder are as follows: mgO content 74-76%, al 2 O 3 22-24% of Fe 2 O 3 The content of R is less than or equal to 0.2 percent 2 The content of O is less than or equal to 0.25 percent.
The grain size of the fused magnesia powder is 200 meshes; the fused magnesia powder comprises the following components: mgO content is more than or equal to 97.5%, fe 2 O 3 The content of SiO is less than or equal to 0.5 percent 2 The content of CaO is less than or equal to 0.5 percent and the content of CaO is less than or equal to 1.2 percent.
The particle size of the silicon carbide particles is 1-0 mm; the silicon carbide particles comprise: the content of SiC is more than or equal to 97 percent, fe 2 O 3 The content of (2) is less than or equal to 0.4%, the content of free carbon is less than or equal to 0.5%, the content of water is less than or equal to 0.2%, and SiO is 2 The content of (2) is less than or equal to 0.6 percent.
The alpha-Al 2 O 3 The grain diameter of the micro powder is 5um; the alpha-Al 2 O 3 The micro powder comprises the following components: al (Al) 2 O 3 The content of Fe is more than or equal to 99 percent 2 O 3 The content of SiO is less than or equal to 0.08 percent 2 The content of R is less than or equal to 0.2 percent 2 The content of O is less than or equal to 0.25 percent.
The particle size of the metal aluminum powder is 325 meshes; the metal aluminum powder comprises the following components: the content of Al is more than or equal to 99%, the content of active Al is more than or equal to 95%, the content of Fe is less than or equal to 0.2%, the content of Si is less than or equal to 0.2%, and the content of Cu is less than or equal to 0.1%.
The particle size of the metal silicon powder is 325 meshes; the metal silicon powder comprises the following components: si content is not less than 98%, fe content is not more than 1%, al content is not more than 0.6%, and Ca content is not more than 1%.
The preparation method comprises the following steps:
s1, preparing particles: uniformly mixing sintered spinel particles with the particle size of 3-1 mm, sintered spinel particles with the particle size of 1-0 mm and silicon carbide particles with the particle size of 1-0 mm according to the weight percentage to obtain a particle ingredient;
s2, preparing co-grinding powder: according to weight percentageThe ratio of the fused magnesia powder, the sintered spinel fine powder and the alpha-Al 2 O 3 Uniformly mixing the micro powder, the metal silicon powder and the metal aluminum powder to prepare co-milled powder;
s3, preparation of a binding agent: polysaccharide and brine according to 1:2, mixing for 3 minutes, and standing for 15 minutes after mixing;
s4, mixing: dry-mixing the granular aggregate for 3 minutes by a wet mill, slowly adding 3.5% of a binding agent, wet-mixing for 5 minutes, adding a co-grinding powder, and mixing for 20 minutes to obtain a mixture;
s5, forming: pressing the mixture on a 1000t electric spiral brick press to form a green brick, and naturally cooling for 8 hours;
s6, drying: placing the green bricks in the middle of a drying kiln, setting the initial kiln feeding temperature to be 50 ℃, and preserving heat for 12 hours at the initial kiln feeding temperature; raising the temperature to 80 ℃, and preserving the heat at the temperature for 6 hours; raising the temperature to 120 ℃, and preserving the heat at the temperature for 12 hours; raising the temperature to 150 ℃, and preserving the heat at the temperature for 6 hours; raising the temperature to 200 ℃, and preserving the heat for 12 hours; the total drying time is more than 48 hours; selecting qualified semi-finished products after kiln discharge;
s7, nitriding and sintering: nitriding and firing in a 15m shuttle kiln, heating up the kiln for 20 ℃/h, preserving heat for 16h at 1600 ℃, firing for 84h, cooling for 48h, cooling to below 80 ℃ and opening a kiln door; nitrogen is introduced into the shuttle kiln in the sintering process;
s8, hooping: the iron hoop is positioned in the middle, the welding seam of the iron hoop is not more than 1mm, and the gap between the iron hoop and the sliding plate is not more than 1mm;
s9, grinding: grinding on a numerical control vertical shaft round table plane grinding machine, wherein the flatness of the working surface of the sliding plate is less than 0.05mm, and drying moisture generated in the sliding plate grinding process by using an infrared dryer;
s10, veneering, coating, inspecting and packaging to obtain a finished product.
Example 2
The carbon-free mechanical spinel sliding brick of the embodiment has the components and weight percentages shown in the formula shown in Table 1, and the preparation method is the same as that of the embodiment 1, and the technological parameters are shown in Table 2.
Example 3
The carbon-free mechanical spinel sliding brick of the embodiment has the components and weight percentages shown in the formula shown in Table 1, and the preparation method is the same as that of the embodiment 1, and the technological parameters are shown in Table 2.
Table 1 granule type and percentage of ingredients used in each example of the present invention
TABLE 2 Process parameters for various embodiments of the invention
The physicochemical properties and average service life parameters of the carbon-free inorganic pressed spinel sliding brick and the common spinel sliding brick of the invention are shown in Table 3:
table 3 comparison of physicochemical Properties and average service Life of the carbon-free mechanically pressed spinel sliding brick of the present invention with ordinary spinel sliding bricks
The carbon-free inorganic spinel sliding brick obtained in the embodiment is tried on calcium-treated steel of a certain company, and after the test is finished, the comparison analysis of corrosion, cracks and the like is carried out on the sliding brick and a common spinel product. The service life of the sliding plate reaches more than 2.2 times, the average diameter expansion is 8mm, and the average erosion rate is 3.33 mm/time. The average erosion rate of the sliding plate of the invention is 3.33 mm/time, which is superior to the average erosion rate of the existing spinel sliding plate brick of 5 mm/furnace through the analysis of the comparison measurement data with the common spinel sliding plate brick. Wear resistance of skateboard: the surface of the common spinel sliding plate brick has more cracks, loose structure and poor thermal shock performance; the sliding plate has good surface condition after three times of use, and has good bonding strength and thermal shock resistance.
Claims (10)
1. The carbon-free inorganic spinel pressed sliding brick is characterized by comprising the following components in percentage by mass: 57-65% of sintering spinel particles, 1-5% of silicon carbide particles, 35-40% of co-milled powder, 100% of total percentage, and 3-5% of binding agent, wherein the binding agent is prepared from polysaccharide and brine according to a weight ratio of 1:2, and the carbon-free inorganic pressed spinel sliding plate brick is prepared by high-temperature nitridation firing.
2. The carbon-free inorganic spinel skateboard tile of claim 1, wherein the polysaccharide is one of dextran, xyloglucan and hydroxymethyldextran.
3. The carbon-free inorganic spinel skateboard tile of claim 1, wherein the brine is a saturated magnesium sulfate solution or a saturated magnesium chloride solution.
4. The carbon-free inorganic spinel sliding plate brick according to claim 1, wherein in the high-temperature nitriding firing process, the firing temperature is 1600-1650 ℃, the heat preservation time is 16 hours, and the total firing time is 80-98 hours.
5. The carbon-free inorganic spinel sliding plate brick according to claim 1, wherein the co-grinding powder comprises 6% -17% of sintered spinel powder, 5% -10% of fused magnesia powder, 10% -15% of metal aluminum powder and 2% -6% of alpha-Al 2 O 3 The micro powder and 1 to 3 percent of metal silicon powder are evenly mixed to prepare the composite material.
6. The carbon-free inorganic spinel sliding block according to claim 5, wherein the particle size of the sintered spinel particles is (3-1, 1-0) mm, the particle size of the sintered spinel fine powder is 200 meshes, and the weight percentages of the particle sizes are: 30-35% of sintered spinel particles with the particle size of 3-1 mm, 24-35% of sintered spinel particles with the particle size of 1-0 mm and 6-17% of sintered spinel fine powder with the particle size of 200 meshes.
7. The carbon-free inorganic spinel sliding plate brick according to claim 5, wherein the grain size of the fused magnesia powder is 200 meshes; the particle size of the silicon carbide particles is 1-0 mm; the alpha-Al 2 O 3 The grain diameter of the micro powder is 5um; the particle size of the metal aluminum powder is 325 meshes; the grain size of the metal silicon powder is 325 meshes.
8. A carbon-free, mechanically pressed spinel slider brick as recited in claim 5, wherein,
the sintered spinel particles and the sintered spinel fine powder are as follows: mgO content 74-76%, al 2 O 3 22-24% of Fe 2 O 3 The content of R is less than or equal to 0.2 percent 2 The content of O is less than or equal to 0.25 percent;
the fused magnesia powder comprises the following components: mgO content is more than or equal to 97.5%, fe 2 O 3 The content of SiO is less than or equal to 0.5 percent 2 The content of CaO is less than or equal to 0.5 percent, and the content of CaO is less than or equal to 1.2 percent;
the silicon carbide particles comprise: the content of SiC is more than or equal to 97 percent, fe 2 O 3 The content of (2) is less than or equal to 0.4%, the content of free carbon is less than or equal to 0.5%, the content of water is less than or equal to 0.2%, and SiO is 2 The content of (2) is less than or equal to 0.6 percent;
the alpha-Al 2 O 3 The micro powder comprises the following components: al (Al) 2 O 3 The content of Fe is more than or equal to 99 percent 2 O 3 The content of SiO is less than or equal to 0.08 percent 2 The content of R is less than or equal to 0.2 percent 2 The content of O is less than or equal to 0.25 percent;
the metal aluminum powder comprises the following components: the content of Al is more than or equal to 99%, the content of active Al is more than or equal to 95%, the content of Fe is less than or equal to 0.2%, the content of Si is less than or equal to 0.2%, and the content of Cu is less than or equal to 0.1%;
the metal silicon powder comprises the following components: si content is not less than 98%, fe content is not more than 1%, al content is not more than 0.6%, and Ca content is not more than 1%.
9. A method of making the carbon-free, inorganic spinel skateboard brick of any one of claims 1-8, comprising the steps of:
step one, granule batching: uniformly mixing sintered spinel particles with the particle size of 3-1 mm, sintered spinel particles with the particle size of 1-0 mm and silicon carbide particles with the particle size of 1-0 mm according to the weight percentage to obtain a particle ingredient;
step two, preparing co-grinding powder: the fused magnesia powder, the sintered spinel fine powder and the alpha-Al are mixed according to the weight percentage 2 O 3 Uniformly mixing the micro powder, the metal silicon powder and the metal aluminum powder to prepare co-milled powder;
step three, preparation of a binding agent: polysaccharide and brine according to 1:2, uniformly mixing the materials in proportion and standing;
step four, mixing: uniformly mixing the granular aggregate, adding 3% -4% of bonding agent, uniformly mixing, finally adding co-grinding powder, and mixing to obtain a mixture;
step five, molding;
step six, drying: drying the green bricks and then selecting qualified semi-finished products;
step seven, nitriding and sintering: nitrogen is introduced in the sintering process;
step eight, hooping;
step nine, grinding;
and step ten, veneering, coating, inspecting and packaging to obtain a finished product.
10. The method for preparing the carbon-free inorganic pressed spinel sliding brick according to claim 9, wherein,
in the third step, the mixing time is not less than 2 minutes, and the standing time is 15 minutes;
in the fourth step, the mixing time of the granular aggregate is 1-3 minutes, the mixture is mixed for 3-5 minutes after adding the binding agent, and the mixture is mixed for 20-25 minutes after adding the co-milled powder;
in the sixth step, the initial temperature is 50 ℃, and the temperature is kept for 12 hours; raising the temperature to 80 ℃, and preserving the heat at the temperature for 6 hours; raising the temperature to 120 ℃, and preserving the heat at the temperature for 12 hours; raising the temperature to 150 ℃, and preserving the heat at the temperature for 6 hours; raising the temperature to 200-220 ℃ and preserving the heat for 12 hours; the total drying time is more than 48 hours;
and step seven, the heating rate is 20-25 ℃/h, the cooling time is 48-60h, and the kiln can be taken out after cooling to below 80 ℃.
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| CN202211731565.8A CN116283315B (en) | 2022-12-30 | 2022-12-30 | Carbon-free inorganic pressed spinel sliding plate brick and preparation method thereof |
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| JPH04357152A (en) * | 1991-06-03 | 1992-12-10 | Harima Ceramic Co Ltd | Monolithic refractory |
| JPH05105506A (en) * | 1991-10-18 | 1993-04-27 | Shinagawa Refract Co Ltd | Slide valve plate brick |
| CN102898157A (en) * | 2012-10-08 | 2013-01-30 | 北京科技大学 | Al4O4C/Al-Al2O3 composite carbon-free sliding plate and preparation method thereof |
| CN103214256A (en) * | 2013-05-10 | 2013-07-24 | 北京科技大学 | Al23O27N5-combined corundum composite slide plate and preparation method thereof |
| CN103539467A (en) * | 2013-10-16 | 2014-01-29 | 马鞍山利尔开元新材料有限公司 | Mechanically-pressed carbon-free corundum spinel ladle brick as well as preparation method thereof |
| CN104072162A (en) * | 2014-06-19 | 2014-10-01 | 浙江自立氧化铝材料科技有限公司 | Preparation method of tabular corundum with high volume density |
| CN106588059A (en) * | 2016-12-29 | 2017-04-26 | 瑞泰科技股份有限公司 | Prefabricated member for lime rotary kiln and preparation method of prefabricated member |
| CN110981513A (en) * | 2019-12-30 | 2020-04-10 | 马鞍山利尔开元新材料有限公司 | Chrome corundum slag-high bauxite composite carbon-free ladle down nozzle brick and preparation method thereof |
| CN111056833A (en) * | 2019-12-03 | 2020-04-24 | 宜兴市耐火材料有限公司 | Nitride-bonded spinel sliding plate and preparation process thereof |
| CN112759381A (en) * | 2020-12-31 | 2021-05-07 | 马鞍山利尔开元新材料有限公司 | Carbon-free ladle down nozzle and preparation method thereof |
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2022
- 2022-12-30 CN CN202211731565.8A patent/CN116283315B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04357152A (en) * | 1991-06-03 | 1992-12-10 | Harima Ceramic Co Ltd | Monolithic refractory |
| JPH05105506A (en) * | 1991-10-18 | 1993-04-27 | Shinagawa Refract Co Ltd | Slide valve plate brick |
| CN102898157A (en) * | 2012-10-08 | 2013-01-30 | 北京科技大学 | Al4O4C/Al-Al2O3 composite carbon-free sliding plate and preparation method thereof |
| CN103214256A (en) * | 2013-05-10 | 2013-07-24 | 北京科技大学 | Al23O27N5-combined corundum composite slide plate and preparation method thereof |
| CN103539467A (en) * | 2013-10-16 | 2014-01-29 | 马鞍山利尔开元新材料有限公司 | Mechanically-pressed carbon-free corundum spinel ladle brick as well as preparation method thereof |
| CN104072162A (en) * | 2014-06-19 | 2014-10-01 | 浙江自立氧化铝材料科技有限公司 | Preparation method of tabular corundum with high volume density |
| CN106588059A (en) * | 2016-12-29 | 2017-04-26 | 瑞泰科技股份有限公司 | Prefabricated member for lime rotary kiln and preparation method of prefabricated member |
| CN111056833A (en) * | 2019-12-03 | 2020-04-24 | 宜兴市耐火材料有限公司 | Nitride-bonded spinel sliding plate and preparation process thereof |
| CN110981513A (en) * | 2019-12-30 | 2020-04-10 | 马鞍山利尔开元新材料有限公司 | Chrome corundum slag-high bauxite composite carbon-free ladle down nozzle brick and preparation method thereof |
| CN112759381A (en) * | 2020-12-31 | 2021-05-07 | 马鞍山利尔开元新材料有限公司 | Carbon-free ladle down nozzle and preparation method thereof |
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| CN116283315B (en) | 2023-12-19 |
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