CN114409417A - Gate valve sliding plate brick for converter slag stopping and preparation method thereof - Google Patents
Gate valve sliding plate brick for converter slag stopping and preparation method thereof Download PDFInfo
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- CN114409417A CN114409417A CN202210050288.8A CN202210050288A CN114409417A CN 114409417 A CN114409417 A CN 114409417A CN 202210050288 A CN202210050288 A CN 202210050288A CN 114409417 A CN114409417 A CN 114409417A
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- 239000011449 brick Substances 0.000 title claims abstract description 42
- 239000002893 slag Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000010439 graphite Substances 0.000 claims abstract description 40
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 39
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 27
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 239000011230 binding agent Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 150000003839 salts Chemical class 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000005245 sintering Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 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 5
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 5
- 239000010431 corundum Substances 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000005406 washing Methods 0.000 claims abstract description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229910003470 tongbaite Inorganic materials 0.000 claims description 9
- 239000002105 nanoparticle Substances 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 5
- 229910052845 zircon Inorganic materials 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical group [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 238000001354 calcination Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 239000005011 phenolic resin Substances 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 abstract description 16
- 238000007254 oxidation reaction Methods 0.000 abstract description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 11
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052681 coesite Inorganic materials 0.000 abstract description 6
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 6
- 239000011819 refractory material Substances 0.000 abstract description 6
- 239000000377 silicon dioxide Substances 0.000 abstract description 6
- 229910052682 stishovite Inorganic materials 0.000 abstract description 6
- 229910052905 tridymite Inorganic materials 0.000 abstract description 6
- 239000011651 chromium Substances 0.000 abstract 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract 1
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- 230000000903 blocking effect Effects 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 229910020105 MgCr2O4 Inorganic materials 0.000 description 4
- -1 aluminum zirconium carbon Chemical compound 0.000 description 4
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 4
- 229910052839 forsterite Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910017625 MgSiO Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910006501 ZrSiO Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 description 1
- 241001551112 Hainardia cylindrica Species 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 150000003754 zirconium Chemical class 0.000 description 1
Classifications
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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
- C04B35/01—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
-
- 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
- C04B35/52—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 carbon, e.g. graphite
-
- 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
-
- 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
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
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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
- 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
- C04B2235/3839—Refractory metal carbides
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- 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
- C04B2235/425—Graphite
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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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- C04B2235/00—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
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9684—Oxidation resistance
Abstract
The invention relates to a gate valve sliding plate brick for converter slag stopping and a preparation method thereof, belonging to the technical field of refractory materials, and the gate valve sliding plate brick for converter slag stopping comprises the following raw materials: MgO-C, Cr3C2-flake graphite, binder and antioxidant; cr (chromium) component3C2-flake graphite is prepared by the steps of: uniformly mixing a molten salt medium, crystalline flake graphite and Cr, putting the mixture into an alumina crucible, sintering the mixture in a corundum tube furnace, cooling the sintered mixture to room temperature, and washing and drying the cooled mixture to obtain Cr3C2-flake graphite. In the technical scheme of the invention, the antioxidant is decomposed at high temperature to generate ZrO2And SiO2，ZrO2Can be connected withThe graphite reacts to generate ZrC, and compared with initial free graphite, the formed ZrC has higher oxidation resistance, so that the free graphite is converted into high-oxidation-resistance ZrC, and the oxidation resistance of the sliding plate brick can be greatly improved.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a gate valve sliding plate brick for converter slag stopping and a preparation method thereof.
Background
The gate valve slide plate brick for converter slag blocking has very strict requirements on thermal shock resistance, oxidation resistance and erosion resistance of a refractory material due to direct erosion of high-temperature molten steel, oxidation of high-oxidizing atmosphere and frequent rapid cooling and rapid heating effects. At present, the material of the gate valve sliding plate brick for converter slag blocking comprises conventional re-fired aluminum zirconium carbon, a body adopts a re-fired aluminum zirconium carbon sliding plate, and an embedding layer adopts a composite structure of a zirconium material. The service life of the conventional reburning aluminum-zirconium-carbon material on a converter with more than 100 tons is 10-12 furnaces; although the service life of the sliding plate embedded with zirconium is prolonged to a certain extent compared with that of the conventional re-fired aluminum-zirconium-carbon sliding plate, the complexity of the production process is greatly increased, the production cost is doubled, the potential safety hazard brought by the prolonged service life is increased, and more rigorous requirements are put forward for operators and judges. Therefore, the comprehensive performance of the slide plate brick is further improved, and the development of a new generation of the high-efficiency converter slag-stopping gate valve slide plate brick with thermal shock resistance, scouring resistance and erosion resistance has important significance for clean steel smelting.
MgO — C refractories have been applied to metallurgical process vessels and parts, such as basic oxygen converters, iron mesh points, slide plates, nozzles, and continuous casting equipment, due to their excellent corrosion resistance and thermal properties. In the traditional MgO-C refractory material, the carbon content is higher, usually 10-20 wt%, and the scale graphite can effectively improve the thermal shock resistance and corrosion resistance of the MgO-C refractory material, but the carbon content is high, so that the problem exists, the carbon oxidation sensitivity is high at high temperature, the first result of carbon oxidation is that the mechanical strength is reduced, the porosity is increased, and the slag penetration resistance is reduced. Carbon can be oxidized to form CO and CO2Resulting in a porous structure with poor strength and corrosion resistance; another problem is environmental pollution, since carbon oxidation produces CO to be released into the atmosphere.
Disclosure of Invention
The invention aims to provide a gate valve slide plate brick for converter slag stopping and a preparation method thereof, wherein ZrSiO is added to the gate valve slide plate brick4The antioxidant replaces the traditional antioxidant AlSi, which can react with MgO-C to form more stable ZrC phase and refractory (MgSiO)2) And forsterite (Mg)2SiO4) The hardness of the sliding plate brick is improved, the oxidation resistance is improved, and Cr is added3C2The flake graphite can react with MgO-C at high temperature to generate MgCr2O4The cylindrical crystal grains have a pinning effect in the sliding plate brick, so that the density of the sliding plate brick is increased, and the strength of the sliding plate brick is increased.
The technical problems to be solved by the invention are as follows: the MgO-C sliding plate brick has higher carbon content, and the thermal oxidation resistance of the sliding plate brick is reduced.
The purpose of the invention can be realized by the following technical scheme:
a gate valve sliding plate brick for converter slag blocking comprises the following raw materials in parts by mass: 70-90 parts of MgO-C and 5-10 parts of Cr3C2-crystalline flake graphite, 1-5 parts of binder and 3-5 parts of antioxidant;
further, the Cr is3C2-flake graphite is prepared by the steps of:
uniformly mixing a molten salt medium, crystalline flake graphite and Cr, putting the mixture into an alumina crucible, sintering the mixture in a corundum tube furnace, heating the mixture to 900-1050 ℃ at the speed of 5 ℃/min, cooling the mixture to room temperature, washing and drying the cooled mixture to obtain Cr3C2-flake graphite, wherein the molten salt medium is prepared from a mixture of, by mass, 1: 1, NaCl and NaF, wherein the molar ratio of the molten salt medium, Cr and crystalline flake graphite is 2-4: 1: 2.5-3.3.
In the reaction process, a molten salt system of NaCl and NaF has strong corrosivity to metals at high temperature, Cr is corroded in the molten salt system to form Cr atoms along with the continuous rise of the temperature, and the Cr atoms react with flake graphite to generate Cr3C2And adheres well to the remaining unreacted flake graphite.
The antioxidant is prepared by the following steps:
ZrSiO4The nano particles are heated to 1650 ℃ at the speed of 5 ℃/min and calcined, and the tempering is carried out for 8h at 250 ℃, thus obtaining the antioxidant.
The above reaction processIn the process, the high-temperature calcination is used for removing ZrSiO4The ZrSiO with higher purity is obtained from the organic impurities in the nano particles4Nanoparticles.
Further, the calcination time is 4-6 h.
Further, the binder is a phenolic resin.
Further, the MgO-C has a carbon content of 5 to 10 wt%.
A preparation method of a gate valve sliding plate brick for converter slag blocking comprises the following steps:
weighing raw materials in parts by mass according to a formula, and mixing Cr3C2Adding the flake graphite into MgO-C, adding an antioxidant and a binder, pressing into a plate under 200MPa, curing at 200 ℃ for 24h, and heating to 1450 ℃ at a speed of 5 ℃/min after curing, and sintering for 3h to obtain a finished product.
In the process, the reaction of adding the antioxidant at high temperature is as follows:
ZrSiO4(s)→ZrO2(s)+SiO2(s)
ZrO2(s)+3C(s)→ZrC(s)+2CO(g)
SiO2(s)+MgO(s)→MgOSiO2(s)
SiO2(s)+MgO(s)→Mg2SiO4(s)
Cr3C2the reactions that occur at high temperature for flake graphite are:
4Cr3C2(s)+13O2(g)→6Cr2O3(s)+8CO(g)
4Cr3C2(S)+17O2(g)→6Cr2O3(S)+8CO2(g)
Cr2O3(s)+MgO(s)→MgCr2O4(s)
the invention has the beneficial effects that:
by adding an antioxidant, the antioxidant decomposes at high temperature to produce ZrO2And SiO2，ZrO2Can react with graphite to form ZrC, which is higher than that of the original free graphiteOxidation resistance, thereby realizing the conversion of free graphite phase into high oxidation resistance ZrC and SiO2MgSiO with low melting point capable of reacting with MgO2And Mg2SiO4Coated on the surface of free graphite to prevent it from being oxidized, ZrC and Mg2SiO4The anti-oxidation performance and the corrosion resistance of the sliding plate brick can be greatly improved by the antioxidant added in the invention.
By adding Cr3C2Cr with flake graphite adhered to the surface of flake graphite3C2Can react with oxygen to generate Cr2O3CO and CO2Further prevent the scale graphite from being oxidized, Cr2O3Further reacts with MgO to generate MgCr2O4The cylindrical crystal grains can be filled with CO and CO2Pores left in the sliding brick, these MgCr2O4The cylindrical crystal grains have a pinning effect in the sliding plate brick, so that the density of the sliding plate brick is increased, and the strength of the sliding plate brick is increased.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Cr3C2-flake graphite is prepared by the steps of:
uniformly mixing 2g of molten salt medium (1g of NaCl and 1g of NaF), 1mol of Cr and 2.5mol of crystalline flake graphite, putting the mixture into an alumina crucible, heating the mixture to 900 ℃ at the speed of 5 ℃/min in a corundum tube furnace for sintering, cooling the sintered mixture to room temperature, and washing and drying the sintered mixture to obtain Cr3C2-flake graphite.
Example 2
Cr3C2-flake graphite is prepared by the steps of:
uniformly mixing 4g of molten salt medium (1g of NaCl and 1g of NaF), 1mol of Cr and 3.3mol of crystalline flake graphite, putting the mixture into an alumina crucible, heating the mixture to 1050 ℃ at the speed of 5 ℃/min in a corundum tube furnace for sintering, cooling the sintered mixture to room temperature, and washing and drying the sintered mixture to obtain Cr3C2-flake graphite.
Example 3
The antioxidant is prepared by the following steps:
23gZrSiO4The nano particles are heated to 1650 ℃ at the speed of 5 ℃/min, calcined for 4h and tempered for 8h at 250 ℃ to obtain the antioxidant.
Example 4
The antioxidant is prepared by the following steps:
24g ZrSiO4The nano particles are heated to 1650 ℃ at the speed of 5 ℃/min, calcined for 6h and tempered for 8h at 250 ℃ to obtain the antioxidant.
Example 5
A gate valve sliding plate brick for converter slag blocking comprises the following raw materials in parts by mass: 70 parts of MgO-C, 5 parts of Cr from example 13C2-crystalline flake graphite, 1 part of binder and 3 parts of antioxidant obtained in example 3;
the gate valve sliding plate brick for the converter slag blocking comprises the following steps:
weighing raw materials in parts by mass according to a formula, and mixing Cr3C2Adding the flake graphite into MgO-C, adding an antioxidant and a binder, pressing into a plate under 200MPa, curing at 200 ℃ for 24h, and heating to 1450 ℃ at a speed of 5 ℃/min after curing, and sintering for 3h to obtain a finished product.
Example 6
A gate valve sliding plate brick for converter slag blocking comprises the following raw materials in parts by mass: 90 parts of MgO-C, 10 parts of Cr from example 23C2-flake graphite, 5 parts binder and 5 parts antioxidant obtained in example 4;
the gate valve sliding plate brick for the converter slag blocking comprises the following steps:
weighing raw materials in parts by mass according to a formula, and mixing Cr3C2Adding the flake graphite into MgO-C, adding an antioxidant and a binder, pressing into a plate under 200MPa, curing at 200 ℃ for 24h, and heating to 1450 ℃ at a speed of 5 ℃/min after curing, and sintering for 3h to obtain a finished product.
Comparative example 1
A gate valve sliding plate brick for converter slag blocking comprises the following raw materials in parts by mass: 70 parts of MgO-C and 5 parts of Cr3C21 part of adhesive and 3 parts of antioxidant Al powder;
the preparation process of the gate valve sliding plate brick for converter slag blocking is synchronous with that of the embodiment 5.
Comparative example 2
A gate valve sliding plate brick for converter slag blocking comprises the following raw materials in parts by mass: 90 parts of MgO-C and 10 parts of Cr3C25 parts of a binder and 5 parts of an antioxidant Si powder;
the preparation process of the gate valve slide plate brick for converter slag blocking is synchronous to the embodiment 6.
The performance tests were now performed on the sliding brick prepared in examples 5 to 6 and comparative examples 1 to 2.
And (3) antioxidant test: all samples were placed on a rotating disk and treated at 1250 ℃ for 5 h. Cylindrical samples (height 50mm, diameter 50mm) were then cut horizontally into two pieces and oxidation was measured in diameter by dimensional measurement using a vernier caliper, the depth of oxidation being measured at three different locations across the cross-section (ASTMC-874). Oxidation (%) - (D1+ D2+ D3)/3]/D0, oxidation depth at three different positions on the cross section of D1, D2 and D3.
D0 original diameter (50mm)
Static slag penetration depth experiment: a hole with a diameter of 3cm and a depth of 3cm was drilled in the center of a fired sample with a diameter of 5cm and a height of 5cm, and the hole was filled with ordinary converter slag fine powder. All samples were then fired at 1500 ℃ for 3h and the slag penetration depth was measured for comparison of the corrosion resistance of the samples
The test results are shown in table 1 below:
TABLE 1
| Group of | Thermal oxidation resistance (%) | Depth of penetration (mm) of the quiet slag |
| Example 5 | 20.32 | 1.86 |
| Example 6 | 19.24 | 1.65 |
| Comparative example 1 | 10.45 | 3.43 |
| Comparative example 2 | 9.22 | 3.24 |
As can be seen from table 1 above, the gate valve slide plate brick for converter slag prevention prepared in the embodiment of the present invention has better thermal oxidation resistance and slag corrosion resistance than the comparative example.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (7)
1. The utility model provides a converter is gate valve slide plate brick for pushing off slag which characterized in that: the composite material comprises the following raw materials in parts by mass: 70-90 parts of MgO-C and 5-10 parts of Cr3C2-crystalline flake graphite, 1-5 parts of a binder and 3-5 parts of an antioxidant;
the Cr is3C2-flake graphite is prepared by the steps of:
uniformly mixing a molten salt medium, crystalline flake graphite and Cr, putting the mixture into an alumina crucible, heating the mixture to 900-1050 ℃ in a corundum tube furnace at the speed of 5 ℃/min for sintering, cooling the mixture to room temperature, and washing and drying the mixture to obtain Cr3C2-flake graphite.
2. The gate valve slide brick for converter slag trap according to claim 1, characterized in that: the molten salt medium is prepared from the following components in percentage by mass of 1: 1, NaCl and NaF, wherein the molar ratio of the molten salt medium, Cr and crystalline flake graphite is 2-4: 1: 2.5-3.3.
3. The gate valve slide brick for converter slag trap according to claim 1, characterized in that: the antioxidant is prepared by the following steps:
ZrSiO4The nano particles are heated to 1400 ℃ and 1650 ℃ at the speed of 5 ℃/min and are calcined at 250 ℃ for 8h to obtain the antioxidant.
4. The gate valve slide brick for converter slag trap according to claim 3, characterized in that: the calcining time is 4-6 h.
5. The gate valve slide brick for converter slag trap according to claim 1, characterized in that: the adhesive is phenolic resin.
6. The gate valve slide brick for converter slag trap according to claim 1, characterized in that: the carbon content in the MgO-C is 5-10 wt%.
7. The method for manufacturing a gate valve slide brick for converter slag trap according to any one of claims 1 to 6, characterized in that: the method comprises the following steps:
weighing raw materials in parts by mass according to a formula, and mixing Cr3C2Adding the flake graphite into MgO-C, adding an antioxidant and a binder, pressing into a plate under 200MPa, curing at 200 ℃ for 24h, and heating to 1450 ℃ at a speed of 5 ℃/min after curing, and sintering for 3h to obtain a finished product.
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