CN111689783A - Nano-carbon-containing refractory castable for desulfurization stirrer and preparation method thereof - Google Patents
Nano-carbon-containing refractory castable for desulfurization stirrer and preparation method thereof Download PDFInfo
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- CN111689783A CN111689783A CN202010556553.0A CN202010556553A CN111689783A CN 111689783 A CN111689783 A CN 111689783A CN 202010556553 A CN202010556553 A CN 202010556553A CN 111689783 A CN111689783 A CN 111689783A
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- 229910021392 nanocarbon Inorganic materials 0.000 title claims abstract description 84
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 36
- 230000023556 desulfurization Effects 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title abstract description 9
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 64
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 64
- 239000000463 material Substances 0.000 claims abstract description 51
- 239000000843 powder Substances 0.000 claims abstract description 51
- 239000002994 raw material Substances 0.000 claims abstract description 38
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 29
- 239000010431 corundum Substances 0.000 claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 25
- 239000000835 fiber Substances 0.000 claims description 44
- 229910052849 andalusite Inorganic materials 0.000 claims description 28
- 239000010959 steel Substances 0.000 claims description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 25
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 24
- 239000004917 carbon fiber Substances 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 16
- 239000003963 antioxidant agent Substances 0.000 claims description 15
- 230000003078 antioxidant effect Effects 0.000 claims description 15
- 239000003638 chemical reducing agent Substances 0.000 claims description 15
- 238000002156 mixing Methods 0.000 claims description 15
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 14
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 14
- 238000002844 melting Methods 0.000 claims description 13
- 230000008018 melting Effects 0.000 claims description 13
- 238000000576 coating method Methods 0.000 claims description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000005229 chemical vapour deposition Methods 0.000 claims description 8
- 238000004880 explosion Methods 0.000 claims description 6
- 239000002120 nanofilm Substances 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 5
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 5
- 229910052594 sapphire Inorganic materials 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 3
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 3
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000007888 film coating Substances 0.000 claims description 2
- 238000009501 film coating Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 36
- 230000035939 shock Effects 0.000 abstract description 29
- 229910052742 iron Inorganic materials 0.000 abstract description 18
- 230000003628 erosive effect Effects 0.000 abstract description 11
- 239000002893 slag Substances 0.000 abstract description 9
- 230000035699 permeability Effects 0.000 abstract description 3
- 239000011819 refractory material Substances 0.000 description 14
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 14
- 229910010271 silicon carbide Inorganic materials 0.000 description 14
- 229910052751 metal Inorganic materials 0.000 description 11
- 239000002184 metal Substances 0.000 description 11
- 239000006185 dispersion Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 230000007547 defect Effects 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 238000005266 casting Methods 0.000 description 6
- 230000006378 damage Effects 0.000 description 6
- 238000000227 grinding Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 230000035515 penetration Effects 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052726 zirconium Inorganic materials 0.000 description 4
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 description 3
- 229910003481 amorphous carbon Inorganic materials 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910052850 kyanite Inorganic materials 0.000 description 3
- 239000010443 kyanite Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000011863 silicon-based powder Substances 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000004137 mechanical activation Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 238000004804 winding Methods 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
- B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—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 silicates other than clay
- C04B35/18—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 silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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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
- C04B2235/32—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
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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
- C04B2235/34—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
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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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
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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
- C04B2235/50—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
- C04B2235/5212—Organic
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- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5454—Particle size related information expressed by the size of the particles or aggregates thereof nanometer sized, i.e. below 100 nm
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted 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
- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
Abstract
The invention discloses a refractory castable material containing nano carbon for a desulfurization stirrer. The castable comprises raw materials with the granularity of more than 1mm, raw materials with the granularity of more than or equal to 0.1mm and less than 1mm and raw materials with the granularity of less than 0.1mm, wherein the raw materials with the granularity of less than 0.1mm comprise 325-mesh pure fused mullite and 325-mesh compact corundum fine powder. The 325-mesh pure fused mullite and the 325-mesh compact corundum fine powder are carbon film nano-coated pure fused mullite and carbon film nano-coated compact corundum fine powder. The invention also discloses a preparation method of the castable. The castable of the invention improves the thermal shock stability and the erosion and permeability resistance of molten slag and molten iron of the castable, so the castable has good comprehensive performance and low cost of raw materials, and the prepared stirrer has long service life and low consumption cost.
Description
Technical Field
The invention belongs to the technical field of refractory materials for desulfurization pretreatment of molten iron in a molten iron tank, and particularly relates to a refractory castable material containing nano-carbon for a desulfurization stirrer and a preparation method thereof.
Background
At present, a stirrer used for KR stirring desulfurization of molten iron at home and abroad is composed of a stirring metal core and a refractory material lining body. The common refractory material of the stirrer lining body is steel fiber reinforced mullite refractory castable, the main refractory raw material is high-purity fused mullite, and the physical and chemical properties are approximately as follows: chemical components: al (Al)2O3≥60％、SiO230-35 percent of the total weight of the material, and the physical properties of the material are that the compressive strength is 110 ℃, × 24h is more than or equal to 24Mpa, 1500 ℃, × 3h is more than or equal to 60Mpa, and the volume density is 110 ℃, × 24h is more than or equal to 2.6g/cm3、1500℃×3h≥2.5g/cm3The thermal shock temperature difference of the stirrer is large, the alternating frequency of cold and hot is high, thermal shock cracking and crack damage of a refractory material lining body of the stirrer are serious, the service life of the stirrer is short, the KR desulfurization stirring mixing dispersion effect deterioration speed is high, the production rhythm of molten iron KR stirring desulfurization is restricted, and the economic index of the molten iron desulfurization production technology is deteriorated.
Aiming at the defects, a large amount of researches are carried out by domestic and foreign scholars aiming at improving the thermal shock stability of the refractory castable of the KR stirrer of the molten iron, such as: the literature "improvement of castable for iron melt desulphurization mixers in songye sea translation," foreign refractory material ", 2006, (31) 4", reports an improved castable for mixers, which comprises the following main components: al (Al)2O345％、SiO232 percent of SiC, 16 percent of CaO, 2.5 percent of CaO, 6 percent of steel fiber and a small amount of reinforcing agent, and the thermal shock stability and the anti-erosion performance of the castable are improved by adding the SiC with high thermal conductivityThe corrosion penetration capacity is improved, the thermal shock stability and the mechanical property of the castable are further improved by increasing the adding amount of steel fibers, and industrial tests are carried out in A, B factories in Japan, and the service life of the stirrer is respectively prolonged from 260 times and 160 times to 325 times and 223 times. The method for increasing the adding amount of the steel fiber and the silicon carbide is also adopted in China, and the research for improving the thermal shock stability of the KR stirrer refractory castable is carried out, for example: the Chinese patent 'Huang Xianda, Huangyutian, KR stirring paddle low-density refractory castable with an authorization publication number of CN 101337821B' discloses a refractory castable with a volume density of 2.3-2.7 g/cm3The low-density refractory castable for the stirring paddle improves the adding amount of silicon carbide and the thermal shock stability and the corrosion resistance and permeability resistance of the castable by compositely adding the silicon carbide aggregate and the powder, and is applied to 120-ton, 150-ton and 180-ton molten iron ladles respectively, so that the service life of the KR stirring paddle is prolonged from 160 times, 220 times and 180 times to 320 times, 380 times and 350 times respectively. The Chinese patent 'Zhuangguxing, Yaowenwei, Heying and Yingrong, KR desulfurization refractory castable for stirring paddle, No. CN 104311042B' discloses a refractory castable for stirring paddle, which adopts citric acid as an alkaline water retarder and metal aluminum powder as a coagulant, ensures the casting forming performance of the castable under different climatic conditions, and further improves the thermal shock stability of the castable by adding silicon carbide and steel fiber. Although both silicon carbide and steel fiber can obviously improve the thermal shock stability of the castable, for the refractory castable for the stirrer, due to the structural characteristic that a metal core is wrapped by a refractory material lining body of the stirrer and the working mode of intermittent immersion in molten iron for stirring, the high-temperature melting and permeation and oxidation of the steel fiber bring about the degradation of the structural performance of the castable, the high thermal conductivity of the silicon carbide inevitably causes the temperature rise of the metal core of the stirrer in the service process, and the crack damage caused by the thermal expansion difference of the metal core and the refractory material lining body is aggravated, which is also the main reason that the service life of the stirrer reported by the patent technology is not long. In order to overcome the defects, Chinese patent ' Ouyang Degang, Luo ' an Zhi, Luo Wei, etc., refractory castable for desulfurization stirrers, No. CN 101857446B ' discloses refractory castable containing sintered zirconium mullite aggregate with a lath-shaped microporous structure; by burningMicro-pores and micro-crack structures in the bonded zirconium mullite aggregate improve the thermal shock stability of the castable; the skeleton stability of the aggregate in the castable and the bonding strength of the aggregate and a matrix are improved by sintering the lath-shaped shape of the zirconium mullite aggregate, the mechanical property of the castable is improved, the thermal shock stability of the castable is improved by the crack-stopping and toughening effects of the lath-shaped aggregate, the addition of silicon carbide is cancelled, the addition of steel fiber is reduced to be below 2%, the thermal stress crack and peeling damage process of a refractory material lining body of the stirrer is delayed, the structural property problem of the castable caused by high-temperature melting permeation and oxidation of the steel fiber is reduced, and the service life of the stirrer is prolonged to be more than 400 times from 300 times. But the sintered zirconium mullite has high cost, which restricts the economical efficiency of practical application. In addition, in order to compensate the problem of the mismatch of the thermal expansion coefficient between the metal core of the stirrer and the refractory lining, high temperature expansion materials such as kyanite and silica are added in the above patents, but the sudden expansion caused by the high temperature reaction and phase transformation of the raw materials causes local cracks of the refractory, which is not favorable for improving the comprehensive performance of the castable. Therefore, the Chinese patent 'Ouyangdegang, Ouyangsi, Li Yuanson and the like, composite fiber reinforced refractory castable for a desulfurization stirrer, application publication No. CN 107141002A', discloses a refractory castable reinforced and toughened by combining multiple raw materials, wherein the thermal shock stability of the castable is improved by the compound and combination of steel fibers, short carbon fibers and alumina hollow spheres, the addition of the steel fibers is reduced to be less than or equal to 1%, the high-temperature oxidation ablation of the carbon fibers and the heat-resistant steel fibers is delayed by the addition of metal silicon powder, and the high-temperature resistance and the erosion resistance of the castable are improved; the microcrack formed by the high-temperature slow expansion of the andalusite toughens the castable, further improves the thermal shock stability of the castable, adjusts the linear change rate of the castable after high-temperature burning, avoids the defects caused by the high-temperature severe expansion of conventional expanded materials such as kyanite, silica and the like, improves the high-temperature mechanical property of the castable, and improves the erosion and wear resistance of the castable. The patented technology has completed industrial tests, and the service life of the stirrer reaches 600 times. However, the chopped carbon fibers are expensive and the dispersion process is complicated, so that the large-scale popularization and application of the technology are restricted.
In view of the above, for the refractory castable for the KR desulfurization stirrer for molten iron, further research needs to be carried out on how to further improve the thermal shock stability of the refractory castable, strengthen the breakage resistance of the castable, reduce the raw material cost of the castable and the like.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the refractory castable for the desulfurization stirrer containing the nanocarbon, which has the advantages of good thermal shock stability, strong penetration resistance to molten slag and molten iron erosion and good high-temperature mechanical property.
In order to achieve the purpose, the invention adopts the following technical scheme:
the refractory castable for the desulfurization stirrer containing the nanocarbon comprises a base material component and an additional component, wherein the base material component comprises the following components in percentage by mass:
15-23% of common fused mullite with the granularity of more than or equal to 10mm and less than 20 mm;
10-18% of common fused mullite with the granularity of less than or equal to 5mm and less than 10 mm;
10-15% of common fused mullite with the granularity of less than or equal to 3mm and less than 5 mm;
4-8% of pure fused mullite with the granularity of less than or equal to 1mm and less than 3 mm;
4-7% of pure fused mullite with the granularity of less than or equal to 0.1mm and less than 1 mm;
325-mesh pure electric fused mullite, 4-8%;
andalusite with the granularity of less than or equal to 1mm and less than 3mm, and 8-13%;
andalusite with the particle size of less than 1mm and less than or equal to 0.1mm, and 7-12%;
325-mesh dense corundum fine powder, 5-8%;
α-Al2O36-10% of micro powder;
4-6% of silicon micropowder;
4.5 to 6.5 percent of pure calcium aluminate cement;
the 325-mesh pure fused mullite is pure fused mullite coated by a nano carbon film, and the 325-mesh compact corundum fine powder is dense corundum fine powder coated by a nano carbon film.
Further, the pure electric mullite with the granularity of less than or equal to 0.1mm and less than 1mm is the pure electric mullite coated by the nano carbon film.
Furthermore, the andalusite with the grain size of less than or equal to 0.1mm and less than 1mm is the andalusite coated by the carbon nano-film.
In the components of the base materials, the total mass percentage of the raw materials with the granularity of more than or equal to 0.1mm is 70-73%.
The anti-explosion fiber comprises the following additional components of heat-resistant steel fiber, an antioxidant, a water reducing agent and polyvinyl alcohol anti-explosion fiber, wherein the diameter of the short carbon fiber is 5-9 mu m, the length of the short carbon fiber is 0.5-2.5 mm, the carbon content is more than or equal to 95 wt%, the melting point of the polyvinyl alcohol anti-explosion fiber is less than or equal to 90 ℃, and the water-soluble temperature is more than or equal to 55 ℃.
The sum of the mass of the components of the base material is 100 parts, and the mass of each additional component is respectively as follows: 1-2 parts of heat-resistant steel fiber; 0.3-0.5 part of antioxidant; 0.1-0.3 part of a water reducing agent; 0.05-0.15 part of polyvinyl alcohol explosion-proof fiber.
Wherein, the nano carbon film is coated with dense corundum fine powder (the granularity is 325 meshes) and pure electric fused mullite (the granularity is 325 meshes and 0.1mm is less than or equal to 1mm) and andalusite (the granularity is 0.1mm is less than or equal to 1mm), which means that the surface of the raw material particles is coated with a layer of nano carbon film, the thickness of the nano carbon film can be controlled within the range of 20-200 nanometers, and the fixed carbon content is more than or equal to 90 percent.
The antioxidant is formed by mixing one or two of silicon metal powder and magnesium-aluminum alloy powder with the granularity of 180 meshes in any proportion; the water reducing agent is formed by mixing one, two or three of sodium tripolyphosphate, sodium hexametaphosphate and FS20 produced by Pasteur Germany in any proportion, and preferably, the maximum added mass of the FS20 is 0.1 part.
The refractory castable for the desulfurization stirrer containing the nano-carbon is prepared by adopting the following steps:
(1) according to the requirements, the surface of dense corundum fine powder (the granularity is 325 meshes), pure fused mullite (the granularity is 325 meshes, the granularity is 0.1mm and is less than or equal to 1mm, wherein the granularity is less than or equal to 0.1mm and is more than or equal to 1mm, which is an optional item but not an optional item) and andalusite (the granularity is 0.1mm and is less than or equal to 1mm, which is an optional item but not an optional item) which need to be subjected to the coating treatment of the nano carbon film is subjected to chemical vapor deposition to coat the nano carbon film, the fixed carbon content of the nano carbon film is more than or equal to 90%, and the thickness of the;
(2) weighing raw materials of various specifications and types according to the adding amount of the raw materials for later use.
(3) Adding base material components with the particle size of 0.15-1 mm and chopped carbon fibers into a vertical mixer, uniformly stirring and dispersing, adding the base materials coated with other various nano carbon films, the rest fine powder base materials (namely the base materials with the particle size of less than 0.1mm), an antioxidant, a water reducing agent and polyvinyl alcohol explosion-proof fibers into a wheel-grinding type mixer, carrying out wheel-grinding mixing for 20-30 minutes, adding the rest raw materials (namely other base material raw materials and heat-resistant steel fibers), carrying out wheel-grinding mixing for 20-30 minutes, uniformly mixing and then discharging to obtain the refractory castable for the desulfurization stirrer containing the nano carbon.
Wherein, the coating nano carbon film is treated by the prior art, for example, the equipment disclosed by Chinese patent application 'powder rotating chemical vapor deposition device' (application publication No. CN103668112A) is adopted, acetylene is carbon source gas, the chemical vapor deposition temperature is 650-750 ℃, the deposition time is 0.5-5 hours, the chemical vapor deposition coating nano carbon film is carried out on the particle surfaces of compact corundum fine powder (the particle size is 325 meshes) and pure fused mullite (the particle size is 325 meshes and 0.1mm is less than or equal to 1mm), andalusite (the particle size is 0.1mm is less than or equal to 1mm), the preparation of the compact corundum fine powder (the particle size is 325 meshes and 0.1mm is less than or equal to 1mm) and the andalusite (the particle size is 0.1mm is less than or equal to 1mm) of the coating nano carbon film is completed, the fixed carbon content of the nano carbon film is more than or equal to 90 percent, the thickness of the nano carbon film can be controlled within the range of 20-200, the nano carbon film is mainly amorphous carbon, contains a small amount of graphite crystal, and can be soaked by a solvent.
The invention has the beneficial effects that:
aiming at the problems of poor thermal shock stability, serious crack damage of a refractory material lining body of the stirrer, short service life and the like of the existing refractory castable for the desulfurization stirrer, the invention is based on the phenomenon that the effect of common improvement measures for increasing the adding amount of silicon carbide and refractory steel fiber is not outstanding, and analyzes the main reason causing the outstanding improvement effect; the addition of the silicon carbide is increased, although the internal and external temperature difference of the refractory castable can be reduced by utilizing the high thermal conductivity of the silicon carbide, so that the purpose of improving the thermal shock stability of the castable is achieved, for a stirrer with a composite structure in which a refractory material lining body wraps a metal core, the high thermal conductivity of the refractory material lining body can increase the temperature and the thermal expansion of the metal core in the process that the stirrer is immersed into molten iron for stirring service, so that the bonding interface stress of the metal core and the refractory material lining is increased rapidly, and the internal stress crack damage is caused; the addition amount of the heat-resistant steel fiber is increased, and although the thermal shock stability of the castable can be improved by utilizing the drawing effect, crack prevention, crack dispersion, induction development and the like of the steel fiber, the melting permeation and high-temperature oxidation of the heat-resistant steel fiber in the castable liner are serious in the intermittent service process of a stirrer which is frequently immersed and extracted with molten iron, so that the structure degradation of the castable liner is caused, the thermal shock stability is reduced, and meanwhile, the oxidation expansion cracking is caused.
Aiming at the defects of common improvement measures of the refractory castable for the stirrer, the measure of adding no silicon carbide is adopted, so that the adverse effect of adding the silicon carbide on the refractory material lining body of the stirrer is avoided; the addition of heat-resistant steel fibers is greatly reduced, so that the defects caused by melting and oxidation of the steel fibers are effectively overcome, the mechanical property of the refractory material lining body is improved by using a small amount of added steel fibers, and the shearing, scouring and abrasion of molten iron and molten slag of the stirrer are reduced. The addition of dense corundum fine powder (the granularity is 325 meshes) and pure electric melting mullite (the granularity is 325 meshes and 0.1mm is not more than 1mm) and andalusite (the granularity is 0.1mm is not more than 1mm) is coated by the nano carbon film, so that the dispersion uniformity of the nano carbon in the castable is improved, the performances of resisting erosion, infiltration, high temperature and thermal shock of the castable, such as erosion penetration of molten slag and molten iron, thermal shock crack damage, high-temperature erosion and the like are improved by virtue of excellent erosion resistance, infiltration resistance, high-temperature resistance and thermal shock resistance of the carbon material, and the purpose of further improving the thermal shock stability of the castable is achieved by virtue of the absorption flexibility, thermal expansion and cold contraction of the; micro-cracks formed by the high-temperature slow expansion of andalusite toughen the castable, so that the thermal shock stability of the castable is further improved, the linear change rate of the castable after high-temperature burning is adjusted, the defects caused by the high-temperature severe expansion of conventional expanded materials such as kyanite and silica are avoided, the high-temperature mechanical property of the castable is improved, and the erosion and wear resistance of the castable is improved; the raw material cost of the castable is reduced by adding the common fused mullite in a high proportion. The molten shrinkage of the polyvinyl alcohol fiber at the temperature of less than or equal to 90 ℃ ensures the smooth discharge of water vapor in the casting material baking process, and improves the anti-burst performance of the casting material baking process. The added chopped carbon fibers have high strength, excellent high-temperature performance, good erosion resistance and drawing toughening effect, so that the service performance of the castable is improved, the thermal shock stability is improved, the length of the chopped carbon fibers is limited, the carbon fibers are prevented from winding and agglomerating in the conventional stirring, mixing and dispersing process, and the uniform dispersion of the chopped carbon fibers is ensured. The antioxidant consisting of one or two of 180-mesh metal silicon powder and magnesium aluminum alloy powder prevents the high-temperature oxidation of the nano carbon film, expands the anti-oxidation temperature range of the antioxidant and improves the carbon retention rate in the service process of the castable. By using sodium tripolyphosphate, sodium hexametaphosphate and FS20 water reducing agent, the water adding amount of the casting material is reduced, and the flowing property, the construction property and the casting compactness of the casting material are improved.
The preparation method of the invention comprises the steps of firstly adding the base material raw material with the particle size of 0.15-1 mm and the chopped carbon fiber into a vertical mixer for even stirring and dispersion, then adding the base material raw material coated with other nano carbon films, the rest fine powder base material (the particle size is less than 0.1mm), the antioxidant, the water reducing agent and the polyvinyl alcohol explosion-proof fiber into a wheel-grinding type mixer for wheel-grinding and mixing for 20-30 minutes for mechanical activation treatment, thus not only improving the dispersion uniformity of the chopped carbon fiber and the nano carbon, and the surface activity and wettability of the chopped carbon fibers and the nano-carbon are enhanced, the contact probability, the contact area and the bonding tightness of various nano-carbon film coated refractory raw materials and the chopped carbon fibers and other refractory raw materials are enhanced, the dispersion uniformity of the nano-carbon in the castable is further improved, and the thermal shock stability and the erosion and permeability resistance of molten slag and molten iron of the castable are improved. Finally, the purposes of improving the comprehensive performance of the castable, reducing the raw material cost of the castable, prolonging the service life of the stirrer, reducing the consumption cost of the stirrer, improving the KR desulfurization technical and economic indexes of the molten iron and the like are achieved.
Compared with the conventional refractory castable for the stirrer, the prepared refractory castable containing the nano-carbon for the desulphurization stirrer has the advantages that various performances are obviously improved through scientific and reasonable selection of the novel nano-carbon and optimization of raw material components and a preparation method; compared with the common refractory castable for the stirrer, the volume density is reduced by 0.5-1.5%, the breaking strength is improved by 5-10% after heat treatment at different temperatures, the water-cooling thermal shock resistance frequency at 1100 ℃ is improved by more than 20%, and the slag corrosion and penetration depth are reduced by 10-15% in a 1500 ℃ heat preservation 3-hour slag resistance experiment under an oxidizing atmosphere. In addition, with the increase of the adding proportion of the nano carbon film coated refractory raw materials, the dispersion uniformity of nano carbon in the castable is continuously improved, and the performance of the refractory castable for the desulfurization stirrer containing nano carbon is continuously improved. Therefore, the performance indexes of the refractory castable for the desulfurization stirrer containing the nano carbon are obviously superior to those of the refractory castable for the conventional stirrer.
Detailed Description
The refractory castable for a desulfurization stirrer containing nanocarbon according to the present invention and the preparation method thereof will be described in further detail with reference to the following specific examples:
example 1: the refractory castable for the desulfurization stirrer containing the nano carbon comprises a base material component and an additional component, wherein the base material comprises the following raw material components in percentage by mass:
common electrically fused mullite with granularity not more than 10mm and less than 20mm and 18 percent;
common electrically fused mullite with granularity not more than 5mm and less than 10mm and 15 percent;
common electric melting mullite, the granularity is less than or equal to 3mm and less than 5mm, 12 percent;
pure fused mullite with the granularity of less than or equal to 1mm and less than 3mm and 5 percent;
pure fused mullite, the granularity is less than or equal to 0.1mm and less than 1mm, 5 percent;
pure fused mullite, 325 meshes, 5%;
andalusite, the granularity is less than or equal to 1mm and less than 3mm, 10%;
andalusite, the granularity is less than or equal to 0.1mm and less than 1mm, 8%;
fine dense corundum powder, 325 mesh, 5%;
α-Al2O37% of micro powder;
5% of silicon micropowder;
5% of pure calcium aluminate cement.
Wherein, the pure electric mullite with 325 meshes and the granularity of more than or equal to 0.1mm and less than 1mm is the pure electric mullite coated by the nano carbon film, the dense corundum fine powder with 325 meshes is the dense corundum fine powder coated by the nano carbon film, and the andalusite with the granularity of more than or equal to 0.1mm and less than 1mm is the andalusite coated by the nano carbon film.
In the raw material components of the base material, the total weight percentage of the base material with the granularity of more than or equal to 0.1mm is 73 percent.
Respectively adding additional components with the sum of the mass of the components of the base materials being 100 parts, wherein the additional components and the mass parts are respectively as follows: 1.5 parts of heat-resistant steel fiber; 0.4 part of antioxidant; 0.2 part of a water reducing agent; 0.1 part of polyvinyl alcohol explosion-proof fiber, wherein the melting point of the polyvinyl alcohol fiber is less than or equal to 90 ℃, and the water-soluble temperature is more than or equal to 55 ℃; 0.1 part of short carbon fiber, wherein the diameter of the short carbon fiber is 5-9 mu m, the length of the short carbon fiber is 0.5-2.5 mm, and the carbon content is more than or equal to 95 wt%.
Wherein, the nano carbon film is coated with dense corundum fine powder (the granularity is 325 meshes), pure fused mullite (the granularity is 325 meshes and 0.1mm is not less than 1mm) and andalusite (the granularity is 0.1mm is not less than 1mm) which are treated by adopting the prior art, in the embodiment, the equipment disclosed by the Chinese patent application of 'powder rotating chemical vapor deposition device' (application publication No. CN103668112A) is adopted, acetylene is carbon source gas, the chemical vapor deposition temperature is 650-750 ℃, the deposition time is 0.5-5 hours, the nano carbon film is coated on the surfaces of the dense corundum fine powder (the granularity is 325 meshes), the pure fused mullite (the granularity is 325 meshes and 0.1mm is not more than 1mm) and the andalusite (the granularity is 0.1mm is not more than 1mm), and the coating of the dense corundum fine powder (the granularity is 325 meshes) and the pure fused mullite (the granularity is 325 meshes and 0.1mm is not more than 1mm) by chemical vapor deposition, thereby finishing the coating of the corundum fine powder (the granularity is 325 meshes), Preparing andalusite (the granularity is 0.1mm or less and is less than 1mm), wherein the thickness of the nano carbon film can be controlled within the range of 20-200 nm, and the fixed carbon content is more than or equal to 90%; and through the control of the temperature of the coating process, the nano carbon film is mainly amorphous carbon and contains a small amount of graphite crystal, and water can be wetted. The antioxidant is prepared from 180-mesh silicon metal powder and magnesium-aluminum alloy powder 1: 1, preparing a composition; the water reducing agent is prepared by mixing sodium tripolyphosphate and FS20 produced by Pasteur Germany according to the weight ratio of 3: 1.
The preparation method of the refractory castable for the desulfurization stirrer containing the nano-carbon comprises the following steps:
(1) respectively coating dense corundum fine powder (with the granularity of 325 meshes) and pure electric fused mullite (with the granularity of 325 meshes and the granularity of 0.1 mm-1 mm), andalusite (with the granularity of 0.1 mm-1 mm) by adopting the prior art, wherein the thickness of the carbon nano-film can be controlled within the range of 20-200 nm, and the fixed carbon content is more than or equal to 90%; the temperature of the coating process is controlled, the nano carbon film is mainly amorphous carbon and contains a small amount of graphite crystal, and water can be wetted;
(2) weighing raw materials of various specifications and types according to the required mass of the raw materials for later use.
(3) Adding a base material raw material with the particle size of 0.15-1 mm and chopped carbon fibers into a vertical mixer, uniformly stirring and dispersing, adding a fine powder base material (with the particle size of less than 0.1mm and comprising various base materials coated with nano carbon films), an antioxidant, a water reducing agent and polyvinyl alcohol explosion-proof fibers into a wheel mill type mixer, carrying out wheel mill mixing for 20-30 minutes, adding other base material raw materials and heat-resistant steel fibers, carrying out wheel mill mixing for 20-30 minutes, uniformly mixing, and then discharging to obtain the refractory castable for the desulfurization mixer containing the nano carbon.
Example 2: the refractory castable for the desulfurization stirrer containing the nano carbon comprises a base material component and an additional component, wherein the base material comprises the following raw material components in percentage by mass:
common electrically fused mullite with granularity not more than 10mm and less than 20mm and 18 percent;
common electrically fused mullite with granularity not more than 5mm and less than 10mm and 15 percent;
common electric melting mullite, the granularity is less than or equal to 3mm and less than 5mm, 12 percent;
pure fused mullite with the granularity of less than or equal to 1mm and less than 3mm and 5 percent;
pure fused mullite, the granularity is less than or equal to 0.1mm and less than 1mm, 5 percent;
pure fused mullite, 325 meshes, 5%;
andalusite, the granularity is less than or equal to 1mm and less than 3mm, 10%;
andalusite, the granularity is less than or equal to 0.1mm and less than 1mm, 8%;
fine dense corundum powder, 325 mesh, 5%;
α-Al2O37% of micro powder;
5% of silicon micropowder;
5% of pure calcium aluminate cement.
Wherein, pure electric mullite with 325 meshes and the granularity of more than or equal to 0.1mm and less than 1mm is pure electric mullite coated by a nano carbon film, and the dense corundum fine powder with 325 meshes is dense corundum fine powder coated by a nano carbon film. The antioxidant is prepared from 180-mesh silicon metal powder and magnesium-aluminum alloy powder 1: 1, preparing a composition; the water reducing agent is FS20, and the amount of the water reducing agent is 0.1 part. The rest is the same as in example 1.
Example 3: the refractory castable for the desulfurization stirrer containing the nano carbon comprises a base material component and an additional component, wherein the base material comprises the following raw material components in percentage by mass:
common electrically fused mullite with granularity not more than 10mm and less than 20mm and 18 percent;
common electrically fused mullite with granularity not more than 5mm and less than 10mm and 15 percent;
common electric melting mullite, the granularity is less than or equal to 3mm and less than 5mm, 12 percent;
pure fused mullite with the granularity of less than or equal to 1mm and less than 3mm and 5 percent;
pure fused mullite, the granularity is less than or equal to 0.1mm and less than 1mm, 5 percent;
pure fused mullite, 325 meshes, 5%;
andalusite, the granularity is less than or equal to 1mm and less than 3mm, 10%;
andalusite, the granularity is less than or equal to 0.1mm and less than 1mm, 8%;
fine dense corundum powder, 325 mesh, 5%;
α-Al2O37% of micro powder;
5% of silicon micropowder;
5% of pure calcium aluminate cement.
Wherein the 325-mesh pure fused mullite is the nano carbon film coated pure fused mullite, the 325-mesh dense corundum fine powder is the nano carbon film coated dense corundum fine powder, and the rest is the same as the embodiment 1.
The refractory castable for a desulfurization stirrer containing nanocarbon prepared in examples 1 to 3; compared with the common refractory castable for the stirrer, the volume density is reduced by 0.5-1.5%, the breaking strength is improved by 5-10% after heat treatment at different temperatures, the water-cooling thermal shock resistance frequency at 1100 ℃ is improved by more than 20%, and the slag corrosion and penetration depth are reduced by 10-15% in a 1500 ℃ heat preservation 3-hour slag resistance experiment under an oxidizing atmosphere. In addition, with the increase of the adding proportion of the nano carbon film coated refractory raw materials, the dispersion uniformity of nano carbon in the castable is continuously improved, and the performance of the refractory castable for the desulfurization stirrer containing nano carbon is continuously improved. In examples 1 to 3, the performance of example 1 is the best and the performance of example 3 is the worst, which is related to the degree of fine particle coating, and the more the fine particle size base material is coated, the larger the surface area of the base material is, the more the carbon film is actually coated, and the performance of the castable material is in a corresponding trend of continuous improvement. Therefore, the performance indexes of the prepared refractory castable for the desulfurization stirrer containing the nano carbon are obviously superior to those of the refractory castable for a conventional stirrer due to the selective nano carbon film coating of the fine-grained base material.
Claims (5)
1. The refractory castable for the desulfurization stirrer containing the nano carbon is characterized in that: the pouring is composed of base material components and additional components, wherein the base material comprises the following raw material components in percentage by mass:
15-23% of common fused mullite with the granularity of more than or equal to 10mm and less than 20 mm;
10-18% of common fused mullite with the granularity of less than or equal to 5mm and less than 10 mm;
10-15% of common fused mullite with the granularity of less than or equal to 3mm and less than 5 mm;
4-8% of pure fused mullite with the granularity of less than or equal to 1mm and less than 3 mm;
4-7% of pure fused mullite with the granularity of less than or equal to 0.1mm and less than 1 mm;
325-mesh pure electric fused mullite, 4-8%;
andalusite with the granularity of less than or equal to 1mm and less than 3mm, and 8-13%;
andalusite with the particle size of less than 1mm and less than or equal to 0.1mm, and 7-12%;
325-mesh dense corundum fine powder, 5-8%;
α-Al2O36-10% of micro powder;
4-6% of silicon micropowder;
4.5 to 6.5 percent of pure calcium aluminate cement;
the 325-mesh pure fused mullite is pure fused mullite coated by a nano carbon film, and the 325-mesh compact corundum fine powder is dense corundum fine powder coated by a nano carbon film;
in the components of the base materials, the total mass percentage of the raw materials with the granularity of more than or equal to 0.1mm is 70-73%;
the anti-explosion fiber comprises the following additional components of heat-resistant steel fiber, an antioxidant, a water reducing agent and polyvinyl alcohol anti-explosion fiber, wherein the diameter of the short-cut carbon fiber is 5-9 mu m, the length of the short-cut carbon fiber is 0.5-2.5 mm, the carbon content is more than or equal to 95 wt%, the melting point of the polyvinyl alcohol anti-explosion fiber is less than or equal to 90 ℃, and the water-soluble temperature is more than or equal to 55 ℃;
the sum of the mass of the components of the base material is 100 parts, and the mass of each additional component is respectively as follows: 1-2 parts of heat-resistant steel fiber; 0.3-0.5 part of antioxidant; 0.1-0.3 part of a water reducing agent; 0.05-0.15 part of polyvinyl alcohol explosion-proof fiber, wherein the melting point of the polyvinyl alcohol explosion-proof fiber is less than or equal to 90 ℃, and the water-soluble temperature is more than or equal to 55 ℃; 0-0.2 part of short carbon fiber, wherein the diameter of the short carbon fiber is 5-9 mu m, the length of the short carbon fiber is 0.5-2.5 mm, and the carbon content is more than or equal to 95 wt%;
the pure electric melting mullite coated by the nano carbon film and the dense corundum fine powder coated by the nano carbon film are characterized in that a layer of nano carbon film is coated on the surface of the raw material particles, the thickness of the nano carbon film can be controlled within the range of 20-200 nanometers, and the fixed carbon content is more than or equal to 90%.
2. The nanocarbon-containing castable refractory for a desulfurization stirrer according to claim 1, wherein: the antioxidant is one or two of silicon metal powder and magnesium aluminum alloy powder with the granularity of 180 meshes; the water reducing agent is one, two or three of sodium tripolyphosphate, sodium hexametaphosphate and FS 20.
3. The nanocarbon-containing castable refractory for desulfurization stirrers according to claim 1 or 2, characterized in that: the pure electric mullite with the granularity of less than or equal to 0.1mm and less than 1mm is the pure electric mullite coated by the nano carbon film; the pure electric mullite coated by the nano carbon film is characterized in that the surface of the raw material particles is coated by the nano carbon film, the thickness of the nano carbon film can be controlled within the range of 20-200 nanometers, and the fixed carbon content is more than or equal to 90 percent.
4. The nanocarbon-containing castable refractory for a desulfurization stirrer according to claim 3, wherein: the andalusite with the granularity of less than or equal to 0.1mm and less than 1mm is the andalusite coated by the carbon nano-film; the andalusite coated with the carbon nano-film is formed by coating a carbon nano-film on the surface of the raw material particles, the thickness of the carbon nano-film can be controlled within the range of 20-200 nanometers, and the content of fixed carbon is more than or equal to 90%.
5. The method for producing the nanocarbon-containing castable refractory for desulfurization stirrers according to any one of claims 1 to 4, characterized in that: the method comprises the following steps:
1) according to the requirements, performing chemical vapor deposition coating of a nano carbon film on the surface of a base material to be subjected to nano carbon film coating treatment, wherein the fixed carbon content of the nano carbon film is more than or equal to 90%, and the thickness of the nano carbon film is 20-200 nm;
2) weighing raw materials of various specifications and types according to the required mass of each component for later use.
3) Adding a base material with the particle size of 0.15-1 mm and chopped carbon fibers into a vertical mixer, uniformly stirring and dispersing, adding the base material, the rest fine powder base material, an antioxidant, a water reducing agent and polyvinyl alcohol explosion-proof fibers coated with other various nano carbon films into a wheel mill type mixer, carrying out wheel mill mixing for 20-30 minutes, adding the rest base material and heat-resistant steel fibers, carrying out wheel mill mixing for 20-30 minutes, uniformly mixing, and then discharging to obtain the refractory castable for the desulfurization mixer containing nano carbon; the fine powder base material is a base material with the granularity less than 0.1 mm.
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| CN202010556553.0A CN111689783A (en) | 2020-06-17 | 2020-06-17 | Nano-carbon-containing refractory castable for desulfurization stirrer and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113105256A (en) * | 2021-04-19 | 2021-07-13 | 武汉钢铁有限公司 | Anti-slag refractory castable for molten iron composite slag skimming plate, preparation method and use method |
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