CN113999027A - Corundum-mullite castable for zinc oxide rotary kiln and preparation method thereof - Google Patents
Corundum-mullite castable for zinc oxide rotary kiln and preparation method thereof Download PDFInfo
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- CN113999027A CN113999027A CN202111340834.3A CN202111340834A CN113999027A CN 113999027 A CN113999027 A CN 113999027A CN 202111340834 A CN202111340834 A CN 202111340834A CN 113999027 A CN113999027 A CN 113999027A
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- Prior art keywords
- corundum
- fine powder
- mullite
- zinc oxide
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 229910052863 mullite Inorganic materials 0.000 title claims abstract description 90
- 239000011787 zinc oxide Substances 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 127
- 239000002245 particle Substances 0.000 claims abstract description 109
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 32
- 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 31
- 239000002994 raw material Substances 0.000 claims abstract description 22
- UGACIEPFGXRWCH-UHFFFAOYSA-N [Si].[Ti] Chemical compound [Si].[Ti] UGACIEPFGXRWCH-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910001954 samarium oxide Inorganic materials 0.000 claims abstract description 16
- 229940075630 samarium oxide Drugs 0.000 claims abstract description 16
- FKTOIHSPIPYAPE-UHFFFAOYSA-N samarium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[Sm+3].[Sm+3] FKTOIHSPIPYAPE-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 15
- 239000010431 corundum Substances 0.000 claims abstract description 15
- 229910052851 sillimanite Inorganic materials 0.000 claims abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 14
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 14
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000004568 cement Substances 0.000 claims abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 21
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 8
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 7
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 7
- 229910003564 SiAlON Inorganic materials 0.000 claims description 6
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 5
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 4
- 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 4
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 3
- 238000000748 compression moulding Methods 0.000 claims description 3
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 3
- 239000010936 titanium Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 230000003628 erosive effect Effects 0.000 abstract description 27
- 230000035939 shock Effects 0.000 abstract description 10
- 238000000465 moulding Methods 0.000 abstract description 8
- 238000003756 stirring Methods 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000011449 brick Substances 0.000 description 15
- 239000011148 porous material Substances 0.000 description 15
- 230000008569 process Effects 0.000 description 11
- 239000011159 matrix material Substances 0.000 description 8
- 239000011819 refractory material Substances 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 4
- 241001465754 Metazoa Species 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- QKYBEKAEVQPNIN-UHFFFAOYSA-N barium(2+);oxido(oxo)alumane Chemical compound [Ba+2].[O-][Al]=O.[O-][Al]=O QKYBEKAEVQPNIN-UHFFFAOYSA-N 0.000 description 3
- 230000000711 cancerogenic effect Effects 0.000 description 3
- 231100000315 carcinogenic Toxicity 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910001430 chromium ion Inorganic materials 0.000 description 3
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000009740 moulding (composite fabrication) Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QRRWWGNBSQSBAM-UHFFFAOYSA-N alumane;chromium Chemical compound [AlH3].[Cr] QRRWWGNBSQSBAM-UHFFFAOYSA-N 0.000 description 1
- -1 aluminum-chromium-zirconium-silicon Chemical compound 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- 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
- C04B35/10—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 aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
- C04B35/103—Refractories from grain sized mixtures containing non-oxide refractory materials, e.g. carbon
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—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
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
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- 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
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- 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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- C04B2235/3852—Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
- C04B2235/3865—Aluminium nitrides
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Abstract
The invention relates to a corundum-mullite castable for a zinc oxide rotary kiln and a preparation method thereof. The technical scheme is as follows: the corundum-mullite castable for the zinc oxide kiln is prepared by using 40-60 wt% of porous corundum-barium aluminate particles, 10-20 wt% of mullite particles, 5-15 wt% of zirconium mullite fine powder, 5-15 wt% of white corundum fine powder, 5-15 wt% of sillimanite fine powder, 5-10 wt% of silicon oxide micro powder, 1-5 wt% of samarium oxide fine powder, 1-5 wt% of barium sulfate fine powder, 1-5 wt% of sialon fine powder and 1-2 wt% of silicon titanium carbide fine powder as raw materials, adding 0.02-0.08 wt% of water reducing agent, 1-4 wt% of calcium aluminate cement and 7-15 wt% of water as the raw materials, uniformly stirring, and performing vibration molding. The corundum-mullite castable for the zinc oxide rotary kiln, which is prepared by the invention, has the characteristics of environmental friendliness, low heat conductivity coefficient, good wear resistance, high thermal shock resistance and excellent erosion resistance.
Description
Technical Field
The invention belongs to the technical field of castable for zinc oxide rotary kilns. In particular to a corundum-mullite castable for a zinc oxide rotary kiln and a preparation method thereof.
Background
The zinc oxide rotary kiln is a device for recovering zinc oxide in zinc-containing slag, and belongs to high-temperature pyrometallurgical equipment. The use conditions of the lining hot-surface refractory material are severe, such as high temperature in a furnace and high concentration of aggressive gases such as alkali, zinc, sulfur dioxide and the like, and the lining hot-surface refractory material is also subjected to airflow scouring and severe fluctuation of the temperature in the furnace. In order to make the rotary kiln run stably, the high-temperature strength and thermal shock resistance of the lining hot-surface refractory material are required to be good, and the lining hot-surface refractory material also has good wear resistance and gas phase erosion resistance.
At present, the hot-surface refractory material of the lining of the zinc oxide rotary kiln is generally built by magnesia-alumina-chrome bricks, and the chemical erosion of the magnesia-alumina-chrome bricks in the zinc oxide rotary kiln is relatively weak due to the existence of chromium oxide (Kangming red, maozui. magnesia-alumina-chrome bricks for a zinc leaching residue rotary volatilization kiln, refractory material 2006(2): pp 154-155.). However, the magnesia-alumina-chromia bricks not only have high apparent porosity, low strength and poor wear resistance, but also have poor thermal shock resistance due to high thermal expansion coefficient. In the long-term use process, the erosion gas is easy to permeate into the magnesia-alumina-chrome brick along brick seams and air holes, the structure of the refractory material is changed, and in addition, part of the refractory material is separated from the brick body under the action of airflow scouring and thermal stress, so that the brick body is peeled off, and the serious damage is caused. In addition, the heat conductivity coefficient of the magnesia-alumina-chrome brick is high, so that the heat dissipation of a kiln body is serious; during the use process, trivalent chromium can be converted into carcinogenic hexavalent chromium ions, and the health of people and animals is seriously threatened. The patent technology of 'aluminum-chromium-zirconium-silicon composite brick for a reaction zone of a zinc oxide rotary kiln and a preparation method thereof' (CN112299826A) adopts plate-shaped corundum, electric melting chromium-aluminum spinel, silicon carbide, zirconia, alumina ultrafine powder and the like as raw materials, and the aluminum-chromium-zirconium-silicon composite brick for the zinc oxide rotary kiln is prepared by mixing, pressing and forming the raw materials.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a corundum-mullite castable for a zinc oxide rotary kiln, which is environment-friendly, low in heat conductivity coefficient, good in wear resistance, high in thermal shock resistance and excellent in erosion resistance, and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
the corundum-mullite castable for the zinc oxide kiln is prepared by using 40-60 wt% of porous corundum-barium aluminate particles, 10-20 wt% of mullite particles, 5-15 wt% of zirconium mullite fine powder, 5-15 wt% of white corundum fine powder, 5-15 wt% of sillimanite fine powder, 5-10 wt% of silicon oxide micro powder, 1-5 wt% of samarium oxide fine powder, 1-5 wt% of barium sulfate fine powder, 1-5 wt% of sialon fine powder and 1-2 wt% of silicon titanium carbide fine powder as raw materials, adding 0.02-0.08 wt% of water reducing agent, 1-4 wt% of calcium aluminate cement and 7-15 wt% of water as the raw materials, uniformly stirring, and performing vibration molding.
The preparation method of the porous corundum-barium aluminate particles comprises the following steps: taking 85-95 wt% of industrial alumina powder and 5-15 wt% of barium carbonate powder as a mixture, adding 2.0-5.0 wt% of polyvinyl alcohol into the mixture, uniformly mixing, performing compression molding, drying, preserving heat for 2-6 hours at 1500-1750 ℃, cooling along with a furnace, crushing, and screening to obtain the porous corundum-barium aluminate particles.
The particle grading of the porous corundum-barium aluminate particles is as follows: 55-65 wt% of particles with the particle size of 5-3 mm, 10-25 wt% of particles with the particle size of 3-1 mm, and 15-30 wt% of particles with the particle size of 1-0.1 mm.
The grain composition of the mullite grains is as follows: 55-65 wt% of particles with the particle size of 5-3 mm, 10-25 wt% of particles with the particle size of 3-1 mm, and 15-30 wt% of particles with the particle size of 1-0.1 mm; al of mullite grains2O3The content is more than 68wt percent.
ZrO of the fine powder of zirconium mullite2The content is more than 15 wt%; the particle size of the fine zirconium mullite powder is less than 75 μm.
Al of the white corundum fine powder2O3The content is more than 97 wt%; the particle size of the white corundum fine powder is less than 45 μm.
Al of the sillimanite fine powder2O3The content is more than 57 wt%; the particle size of the sillimanite fine powder is less than 75 μm.
SiO of the silicon oxide micro powder2The content is more than 97 wt%; the particle size of the silicon oxide micropowder is less than 5 μm.
Sm of the samarium oxide fine powder2O3The content is more than 46 wt%; the particle size of the samarium oxide fine powder is less than 45 μm.
BaSO of the barium sulfate fine powder4The content is more than 97 wt%; the particle size of the barium sulfate fine powder is less than 45 μm.
The SiAlON content of the SiAlON fine powder is more than 95 wt%; the particle size of the sialon fine powder is less than 45 μm.
Ti of the titanium silicon carbide fine powder3SiC2The content is more than 95 wt%; the particle size of the silicon titanium carbide fine powder is less than 75 μm.
The water reducing agent is one of sodium tripolyphosphate and sodium hexametaphosphate.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
the corundum-mullite castable for the zinc oxide rotary kiln, which is prepared by the invention, is a chromium-free castable, can avoid the formation of carcinogenic compounds containing hexavalent chromium ions, does not cause potential harm to people and animals, does not need high-temperature firing, and is environment-friendly.
The porous corundum-barium aluminate particles adopted by the invention are in a porous structure formed by decomposing barium carbonate in situ, and barium oxide formed by decomposition reacts with aluminum oxide under high-temperature use, so that formed air holes are converted into closed micro-nano holes, and the prepared corundum-mullite castable for the zinc oxide rotary kiln has low heat conductivity coefficient and excellent heat insulation performance.
The mullite grains, the zirconium mullite fine powder and the sialon fine powder which are adopted by the invention belong to raw materials with high wear resistance, and the barium aluminate phase in the adopted porous corundum-barium aluminate grains can be hydrated to generate a gel binding phase in the pouring process, so that the binding degree between the porous corundum-barium aluminate grains and the matrix is improved, and the wear resistance of the corundum-mullite castable for the zinc oxide rotary kiln is further improved. In addition, the introduced samarium oxide fines may react with the alumina in the matrixFormation of SmAlO3The method promotes the sintering densification of the castable substrate under the high-temperature use condition, and further improves the wear resistance of the corundum-mullite castable for the zinc oxide rotary kiln.
The porous corundum-barium aluminate particles adopted by the invention have rich micropores, can effectively absorb and relieve thermal stress, the zirconium mullite can toughen the castable through zirconium oxide phase change, and the acicular structure SmAlO formed in situ3The thermal shock resistance of the corundum-mullite castable for the zinc oxide rotary kiln can be further improved through a bridging and pulling mechanism, so that the prepared corundum-mullite castable for the zinc oxide rotary kiln has excellent thermal shock resistance.
Compared with refractory bricks, the corundum-mullite castable for the zinc oxide rotary kiln has better integrity, and prevents a gas-phase erosion medium from permeating into the castable along weak parts such as brick joints. The porous corundum-barium aluminate particles can react with the matrix under the high-temperature use condition to form a compact reaction layer on the surfaces of the particles, so that the infiltration and the erosion of gas-phase erosion media to the particles are effectively prevented. The sillimanite used in the invention can be gradually mullite in the using process, and the titanium silicon carbide can be oxidized to generate titanium oxide, and the processes are all accompanied with certain volume expansion, so that the pores in the castable matrix are effectively blocked, and further, the permeation erosion of gas-phase erosion media in the matrix is greatly slowed down. In addition, barium sulfate adopted by the invention can not react with various erosion media, and ZnO reacts with active titanium oxide generated by oxidizing titanium silicon carbide in the erosion process to generate ZnTiO with high chemical stability3And the further permeation and erosion of a gas phase erosion medium are prevented, so that the prepared corundum-mullite castable for the zinc oxide rotary kiln has excellent erosion resistance.
Detection results of corundum-mullite castable for zinc oxide rotary kiln prepared by the invention
Under the conditions of 110 ℃ and 24 h: the bulk density is 2.58-2.88 g/cm3The apparent porosity is 8 to 15%, the average pore diameter is 5 to 12 μm, and the flexural strength is 7 to 12MPa；
Under the conditions of 1600 ℃ and 3 h: the bulk density is 2.50-2.75 g/cm3The apparent porosity is 6 to 12%, the average pore diameter is 3 to 8 μm, the flexural strength is 10 to 16MPa, and the thermal conductivity at 800 ℃ is 0.50 to 0.80W/(m.k).
Therefore, the corundum-mullite castable for the zinc oxide rotary kiln, which is prepared by the invention, has the characteristics of environmental friendliness, low heat conductivity coefficient, good wear resistance, high thermal shock resistance and excellent erosion resistance.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope:
in order to avoid repetition, the material technical parameters related to this specific embodiment are uniformly described as follows, which is not described in the embodiments again:
the particle grading of the porous corundum-barium aluminate particles is as follows: 55-65 wt% of particles with the particle size of 5-3 mm, 10-25 wt% of particles with the particle size of 3-1 mm, and 15-30 wt% of particles with the particle size of 1-0.1 mm.
The grain composition of the mullite grains is as follows: 55-65 wt% of particles with the particle size of 5-3 mm, 10-25 wt% of particles with the particle size of 3-1 mm, and 15-30 wt% of particles with the particle size of 1-0.1 mm; al of mullite grains2O3The content is more than 68wt percent.
ZrO of the fine powder of zirconium mullite2The content is more than 15 wt%; the particle size of the fine zirconium mullite powder is less than 75 μm.
Al of the white corundum fine powder2O3The content is more than 97 wt%; the particle size of the white corundum fine powder is less than 45 μm.
Al of the sillimanite fine powder2O3The content is more than 57 wt%; the particle size of the sillimanite fine powder is less than 75 μm.
SiO of the silicon oxide micro powder2The content is more than 97 wt%; the particle size of the silicon oxide micropowder is less than 5 μm.
Sm of the samarium oxide fine powder2O3The content is more than 46 wt%; the particle size of the samarium oxide fine powder is less than 45 μm.
BaS of the barium sulfate fine powderO4The content is more than 97 wt%; the particle size of the barium sulfate fine powder is less than 45 μm.
The SiAlON content of the SiAlON fine powder is more than 95 wt%; the particle size of the sialon fine powder is less than 45 μm.
Ti of the titanium silicon carbide fine powder3SiC2The content is more than 95 wt%; the particle size of the silicon titanium carbide fine powder is less than 75 μm.
Example 1
A corundum-mullite castable for a zinc oxide rotary kiln and a preparation method thereof. The preparation method in this example is:
firstly, 40 wt% of porous corundum-barium aluminate particles, 10 wt% of mullite particles, 15 wt% of zirconium mullite fine powder, 15 wt% of white corundum fine powder, 5 wt% of sillimanite fine powder, 10 wt% of silicon oxide micro powder, 1 wt% of samarium oxide fine powder, 1 wt% of barium sulfate fine powder, 1 wt% of sialon fine powder and 2 wt% of silicon titanium carbide fine powder are taken as raw materials, then 0.02 wt% of sodium tripolyphosphate, 1 wt% of calcium aluminate cement and 15 wt% of water are added as the raw materials, the raw materials are uniformly stirred and formed by vibration, and the corundum-mullite castable for the zinc oxide rotary kiln is prepared.
The preparation method of the porous corundum-barium aluminate particles comprises the following steps: taking 85 wt% of industrial alumina powder and 15 wt% of barium carbonate powder as a mixture, adding 2.0 wt% of polyvinyl alcohol into the mixture, uniformly mixing, pressing, molding, drying, keeping the temperature at 1500 ℃ for 2 hours, cooling along with a furnace, crushing, and screening to obtain the porous corundum-barium aluminate particles.
Detection results of corundum-mullite castable for zinc oxide rotary kiln prepared in the embodiment
Under the conditions of 110 ℃ and 24 h: the bulk density is 2.58g/cm3The apparent porosity is 15 percent, the average pore diameter is 5 mu m, and the flexural strength is 7 MPa;
under the conditions of 1600 ℃ and 3 h: the bulk density is 2.50g/cm3The apparent porosity was 12%, and the average pore diameter was 3 μm; the flexural strength is 10MPa, and the thermal conductivity is 0.50W/(m.k).
Example 2
A corundum-mullite castable for a zinc oxide rotary kiln and a preparation method thereof. The preparation method in this example is:
the corundum-mullite castable for the zinc oxide rotary kiln is prepared by taking 60 wt% of porous corundum-barium aluminate particles, 12 wt% of mullite particles, 5 wt% of zirconium-mullite fine powder, 5 wt% of white corundum fine powder, 5 wt% of sillimanite fine powder, 5 wt% of silicon oxide micro powder, 2 wt% of samarium oxide fine powder, 2 wt% of barium sulfate fine powder, 3 wt% of sialon fine powder and 1 wt% of silicon titanium carbide fine powder as raw materials, adding 0.03 wt% of sodium hexametaphosphate, 3 wt% of calcium aluminate cement and 7 wt% of water as the raw materials, uniformly stirring, and performing vibration molding.
The preparation method of the porous corundum-barium aluminate particles comprises the following steps: taking 88 wt% of industrial alumina powder and 12 wt% of barium carbonate powder as a mixture, adding 3.5 wt% of polyvinyl alcohol into the mixture, uniformly mixing, pressing, molding, drying, keeping the temperature for 3 hours at 1600 ℃, cooling along with a furnace, crushing, and screening to obtain the porous corundum-barium aluminate particles.
Detection results of corundum-mullite castable for zinc oxide rotary kiln prepared in the embodiment
Under the conditions of 110 ℃ and 24 h: the bulk density is 2.76g/cm3The apparent porosity is 11 percent, the average pore diameter is 7 mu m, and the flexural strength is 9 MPa;
under the conditions of 1600 ℃ and 3 h: the bulk density is 2.63g/cm3The apparent porosity was 8%, the average pore diameter was 4 μm, the flexural strength was 12MPa, and the thermal conductivity at 800 ℃ was 0.66W/(m.k).
Example 3
A corundum-mullite castable for a zinc oxide rotary kiln and a preparation method thereof. The preparation method in this example is:
the corundum-mullite castable for the zinc oxide rotary kiln is prepared by taking 42 wt% of porous corundum-barium aluminate particles, 20 wt% of mullite particles, 6 wt% of zirconium-mullite fine powder, 7 wt% of white corundum fine powder, 8 wt% of sillimanite fine powder, 6 wt% of silicon oxide micro powder, 5 wt% of samarium oxide fine powder, 3 wt% of barium sulfate fine powder, 2 wt% of sialon fine powder and 1 wt% of silicon titanium carbide fine powder as raw materials, adding 0.02 wt% of sodium hexametaphosphate, 4 wt% of calcium aluminate cement and 10 wt% of water as the raw materials, uniformly stirring, and performing vibration molding.
The preparation method of the porous corundum-barium aluminate particles comprises the following steps: taking 90 wt% of industrial alumina powder and 10 wt% of barium carbonate powder as a mixture, adding 5.0 wt% of polyvinyl alcohol into the mixture, uniformly mixing, performing compression molding, drying, keeping the temperature at 1750 ℃ for 6 hours, cooling along with a furnace, crushing, and screening to obtain the porous corundum-barium aluminate particles.
Detection results of corundum-mullite castable for zinc oxide rotary kiln prepared in the embodiment
Under the conditions of 110 ℃ and 24 h: the bulk density is 2.88g/cm3The apparent porosity is 8 percent, the average pore diameter is 12 mu m, and the flexural strength is 12 MPa;
under the conditions of 1600 ℃ and 3 h: the bulk density is 2.75g/cm3The apparent porosity was 6%, the average pore diameter was 8 μm, the flexural strength was 16MPa, and the thermal conductivity at 800 ℃ was 0.80W/(m.k).
Example 4
A corundum-mullite castable for a zinc oxide rotary kiln and a preparation method thereof. The preparation method in this example is:
firstly, using 45 wt% of porous corundum-barium aluminate particles, 11 wt% of mullite particles, 7 wt% of zirconium mullite fine powder, 8 wt% of white corundum fine powder, 7 wt% of sillimanite fine powder, 7 wt% of silicon oxide micro powder, 3 wt% of samarium oxide fine powder, 5 wt% of barium sulfate fine powder, 5 wt% of sialon fine powder and 2 wt% of silicon titanium carbide fine powder as raw materials, then adding 0.03 wt% of sodium tripolyphosphate, 3 wt% of calcium aluminate cement and 9 wt% of water as the raw materials, uniformly stirring, and performing vibration molding to obtain the corundum-mullite castable for the zinc oxide rotary kiln.
The preparation method of the porous corundum-barium aluminate particles comprises the following steps: taking 95 wt% of industrial alumina powder and 5 wt% of barium carbonate powder as a mixture, adding 3.0 wt% of polyvinyl alcohol into the mixture, uniformly mixing, pressing, molding, drying, keeping the temperature at 1700 ℃ for 4 hours, cooling along with a furnace, crushing, and screening to obtain the porous corundum-barium aluminate particles.
Detection results of corundum-mullite castable for zinc oxide rotary kiln prepared in the embodiment
Under the conditions of 110 ℃ and 24 h: the bulk density is 2.82g/cm3The apparent porosity is 10%, the average pore diameter is 10 μm, and the flexural strength is 11 MPa;
under the conditions of 1600 ℃ and 3 h: the bulk density is 2.72g/cm3The apparent porosity was 7%, the average pore diameter was 6 μm, the flexural strength was 15MPa, and the thermal conductivity at 800 ℃ was 0.69W/(m.k).
Example 5
A corundum-mullite castable for a zinc oxide rotary kiln and a preparation method thereof. The preparation method in this example is:
firstly, taking 44 wt% of porous corundum-barium aluminate particles, 15 wt% of mullite particles, 9 wt% of zirconium mullite fine powder, 6 wt% of white corundum fine powder, 15 wt% of sillimanite fine powder, 5 wt% of silicon oxide micro powder, 2 wt% of samarium oxide fine powder, 1 wt% of barium sulfate fine powder, 2 wt% of sialon fine powder and 1 wt% of silicon titanium carbide fine powder as raw materials, then adding 0.08 wt% of sodium tripolyphosphate, 2 wt% of calcium aluminate cement and 11 wt% of water as the raw materials, stirring uniformly, and vibrating and forming to prepare the corundum-mullite castable for the zinc oxide rotary kiln.
The preparation method of the porous corundum-barium aluminate particles comprises the following steps: the porous corundum-barium aluminate particle is prepared by taking 92 wt% of industrial alumina powder and 8 wt% of barium carbonate powder as a mixture, adding 4.0 wt% of polyvinyl alcohol into the mixture, uniformly mixing, pressing, forming, drying, keeping the temperature at 1550 ℃ for 5 hours, cooling along with a furnace, crushing and screening.
Detection results of corundum-mullite castable for zinc oxide rotary kiln prepared in the embodiment
Under the conditions of 110 ℃ and 24 h: the bulk density is 2.72g/cm3The apparent porosity is 12 percent, the average pore diameter is 8 mu m, and the flexural strength is 10 MPa;
under the conditions of 1600 ℃ and 3 h: the bulk density is 2.61g/cm3The apparent porosity was 10%, the average pore diameter was 7 μm, the flexural strength was 14MPa, and the thermal conductivity at 800 ℃ was 0.73W/(m.k).
Compared with the prior art, the specific implementation mode has the following positive effects:
the corundum-mullite castable for the zinc oxide rotary kiln, which is prepared by the specific embodiment, is a chromium-free castable, can avoid the formation of carcinogenic compounds containing hexavalent chromium ions, does not cause potential harm to people and animals, does not need high-temperature firing, and is environment-friendly.
The porous corundum-barium aluminate particles adopted by the specific embodiment are formed into a porous structure by utilizing barium carbonate decomposition in situ, and barium oxide and aluminum oxide formed by decomposition react at high temperature, so that formed air holes are converted into closed micro-nano holes, and the prepared corundum-mullite castable for the zinc oxide rotary kiln has low heat conductivity coefficient and excellent heat insulation performance.
The mullite particles, the zircon mullite fine powder and the sialon fine powder adopted by the specific embodiment belong to raw materials with high wear resistance, and the barium aluminate phase in the prepared porous corundum-barium aluminate particles can be hydrated to generate a gel binding phase in the pouring process, so that the binding degree between the porous corundum-barium aluminate particles and the matrix is improved, and the wear resistance of the corundum-mullite castable for the zinc oxide rotary kiln is further improved. In addition, the introduced samarium oxide fine powder reacts with alumina in the matrix to form SmAlO3The method promotes the sintering densification of the castable substrate under the high-temperature use condition, and further improves the wear resistance of the corundum-mullite castable for the zinc oxide rotary kiln.
The porous corundum-barium aluminate particles adopted by the specific embodiment have rich micropores, can effectively absorb and relieve thermal stress, the zirconium mullite can toughen the castable through zirconium oxide phase change, and the acicular structure SmAlO formed in situ3The thermal shock resistance of the corundum-mullite castable for the zinc oxide rotary kiln can be further improved through a bridging and pulling mechanism, so that the prepared corundum-mullite castable for the zinc oxide rotary kiln has excellent thermal shock resistance.
Compared with refractory bricks, the corundum-mullite castable for the zinc oxide rotary kiln prepared by the specific embodiment has better integrity, and prevents a gas-phase erosion medium from permeating into the castable along weak parts such as brick joints. Pouring process of barium aluminate phase in porous corundum-barium aluminate particlesThe porous corundum-barium aluminate particles can react with the substrate under the high-temperature use condition to form a compact reaction layer on the surfaces of the particles, so that the infiltration and the erosion of gas-phase erosion media to the particles are effectively prevented. The sillimanite used in the embodiment is gradually mullite-treated in the using process, the silicon titanium carbide is oxidized to produce titanium oxide, and the processes are all accompanied with certain volume expansion, so that air holes in the castable matrix are effectively blocked, and further, the permeation erosion of a gas-phase erosion medium in the matrix is greatly slowed down. In addition, barium sulfate adopted by the embodiment does not react with various erosion media, and ZnO reacts with active titanium oxide generated by oxidizing titanium silicon carbide in the erosion process to generate ZnTiO with high chemical stability3And the further permeation and erosion of a gas phase erosion medium are prevented, so that the prepared corundum-mullite castable for the zinc oxide rotary kiln has excellent erosion resistance.
The detection result of the corundum-mullite castable for zinc oxide rotary kilns prepared by the specific embodiment
Under the conditions of 110 ℃ and 24 h: the bulk density is 2.58-2.88 g/cm3The apparent porosity is 8-15%, the average pore diameter is 5-12 μm, and the flexural strength is 7-12 MPa;
under the conditions of 1600 ℃ and 3 h: the bulk density is 2.50-2.75 g/cm3The apparent porosity is 6 to 12%, the average pore diameter is 3 to 8 μm, the flexural strength is 10 to 16MPa, and the thermal conductivity at 800 ℃ is 0.50 to 0.80W/(m.k).
Therefore, the corundum-mullite castable for the zinc oxide rotary kiln, which is prepared by the specific embodiment, has the characteristics of environmental friendliness, low heat conductivity coefficient, good wear resistance, high thermal shock resistance and excellent erosion resistance.
Claims (11)
1. A preparation method of corundum-mullite castable for a zinc oxide rotary kiln is characterized by comprising the following steps: firstly, 40-60 wt% of porous corundum-barium aluminate particles, 10-20 wt% of mullite particles, 5-15 wt% of zirconium mullite fine powder, 5-15 wt% of white corundum fine powder, 5-15 wt% of sillimanite fine powder, 5-10 wt% of silicon oxide micro powder, 1-5 wt% of samarium oxide fine powder, 1-5 wt% of barium sulfate fine powder, 1-5 wt% of sialon fine powder and 1-2 wt% of titanium silicon carbide fine powder are taken as raw materials, then 0.02-0.08 wt% of water reducing agent, 1-4 wt% of calcium aluminate cement and 7-15 wt% of water are added as the raw materials, the raw materials are uniformly stirred and subjected to vibration forming to prepare the corundum-mullite castable for the zinc oxide kiln;
the preparation method of the porous corundum-barium aluminate particles comprises the following steps: taking 85-95 wt% of industrial alumina powder and 5-15 wt% of barium carbonate powder as a mixture, adding 2.0-5.0 wt% of polyvinyl alcohol into the mixture, uniformly mixing, performing compression molding, drying, preserving heat for 2-6 hours at 1500-1750 ℃, cooling along with a furnace, crushing, and screening to obtain porous corundum-barium aluminate particles;
the particle grading of the porous corundum-barium aluminate particles is as follows: 55-65 wt% of particles with the particle size of 5-3 mm, 10-25 wt% of particles with the particle size of 3-1 mm, and 15-30 wt% of particles with the particle size of 1-0.1 mm;
the grain composition of the mullite grains is as follows: 55-65 wt% of particles with the particle size of 5-3 mm, 10-25 wt% of particles with the particle size of 3-1 mm, and 15-30 wt% of particles with the particle size of 1-0.1 mm; al of mullite grains2O3The content is more than 68wt percent.
2. The method for preparing corundum-mullite castable for zinc oxide rotary kilns according to claim 1, wherein ZrO in the fine zirconia-mullite powder is ZrO2The content is more than 15 wt%; the particle size of the fine zirconium mullite powder is less than 75 μm.
3. The method for preparing corundum-mullite castable for zinc oxide rotary kilns according to claim 1, wherein Al in the white corundum fine powder is2O3The content is more than 97 wt%; the particle size of the white corundum fine powder is less than 45 μm.
4. The method for preparing corundum-mullite castable for zinc oxide rotary kilns according to claim 1, wherein Al of sillimanite fine powder2O3The content is more than 57 wt%; fine sillimaniteThe particle size of the powder is less than 75 μm.
5. The method for preparing the corundum-mullite castable for the zinc oxide rotary kiln according to claim 1, wherein SiO of the silicon oxide micropowder2The content is more than 97 wt%; the particle size of the silicon oxide micropowder is less than 5 μm.
6. The method for preparing the corundum-mullite castable for the zinc oxide rotary kiln according to claim 1, wherein Sm of the samarium oxide fine powder2O3The content is more than 46 wt%; the particle size of the samarium oxide fine powder is less than 45 μm.
7. The method for preparing corundum-mullite castable for zinc oxide rotary kilns according to claim 1, wherein BaSO of the barium sulfate fine powder4The content is more than 97 wt%; the particle size of the barium sulfate fine powder is less than 45 μm.
8. The preparation method of the corundum-mullite castable for the zinc oxide rotary kiln, according to claim 1, is characterized in that the SiAlON content of the SiAlON fine powder is more than 95 wt%; the particle size of the sialon fine powder is less than 45 μm.
9. The method for preparing corundum-mullite castable for zinc oxide rotary kilns according to claim 1, wherein Ti of the fine silicon titanocarbide powder3SiC2The content is more than 95 wt%; the particle size of the silicon titanium carbide fine powder is less than 75 μm.
10. The method for preparing the corundum-mullite castable for the zinc oxide rotary kiln according to claim 1, wherein the water reducing agent is one of sodium tripolyphosphate and sodium hexametaphosphate.
11. A corundum-mullite castable for a zinc oxide rotary kiln, which is characterized by being prepared according to the preparation method of the corundum-mullite castable for the zinc oxide rotary kiln of any one of claims 1 to 10.
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| CN117776690A (en) * | 2024-02-27 | 2024-03-29 | 北京利尔高温材料股份有限公司 | Sol-combined blast furnace iron runner gunning material |
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| JPH09183674A (en) * | 1995-12-28 | 1997-07-15 | Harima Ceramic Co Ltd | Monolithic refractory for flowing-in working |
| CN101367668A (en) * | 2008-09-25 | 2009-02-18 | 武汉钢铁(集团)公司 | Pouring material for manufacturing pellet ore rotary kiln and manufacturing method thereof |
| US20130260982A1 (en) * | 2012-03-30 | 2013-10-03 | Korea Institute Of Science And Technology | Cement-free high strength unshaped refractory |
| CN102942375A (en) * | 2012-11-23 | 2013-02-27 | 景德镇陶瓷学院 | Method for preparing corundum-mullite (whisker) fireproofing material through mullite whisker precursor in quantitative in-situ mode |
| CN103011863A (en) * | 2012-12-21 | 2013-04-03 | 武汉科技大学 | Rotary kilneye castable for treating industrial minerals and preparation method of castable |
| CN105601306A (en) * | 2016-01-23 | 2016-05-25 | 山东鲁铭高温材料科技有限公司 | Production process of unshaped refractory material and lining brick for zinc oxide rotary kiln |
| CN111825434A (en) * | 2020-06-05 | 2020-10-27 | 长兴云峰炉料有限公司 | Environment-friendly Al2O3-SiC-Ti3SiC2Castable and preparation method thereof |
| CN111747735A (en) * | 2020-07-09 | 2020-10-09 | 郑州市科源耐火材料有限公司 | Energy-saving environment-friendly refractory castable and refractory brick for zinc smelting volatilizing kiln and preparation method of refractory brick |
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| CN112608160A (en) * | 2020-12-31 | 2021-04-06 | 长兴兴鹰新型耐火建材有限公司 | High-strength wear-resistant castable special for cement kiln gate |
| CN116675525A (en) * | 2023-04-21 | 2023-09-01 | 宜兴摩根热陶瓷有限公司 | High-strength alkali-resistant light refractory castable and preparation method thereof |
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Denomination of invention: Corundum mullite castable for zinc oxide Rotary kiln and its preparation method Effective date of registration: 20230721 Granted publication date: 20221011 Pledgee: Ningxiang sub branch of Bank of Changsha Co.,Ltd. Pledgor: HUNAN LIDA HIGH-NEW MATERIAL Co.,Ltd. Registration number: Y2023980049276 |
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Denomination of invention: A corundum mullite castable for zinc oxide rotary kiln and its preparation method Granted publication date: 20221011 Pledgee: Ningxiang sub branch of Bank of Changsha Co.,Ltd. Pledgor: HUNAN LIDA HIGH-NEW MATERIAL Co.,Ltd. Registration number: Y2024980031519 |