CN117865666B - Lining repairing material for kiln - Google Patents
Lining repairing material for kiln Download PDFInfo
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- CN117865666B CN117865666B CN202410103454.5A CN202410103454A CN117865666B CN 117865666 B CN117865666 B CN 117865666B CN 202410103454 A CN202410103454 A CN 202410103454A CN 117865666 B CN117865666 B CN 117865666B
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- 239000000463 material Substances 0.000 title claims abstract description 61
- 239000000843 powder Substances 0.000 claims abstract description 89
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 55
- 239000002131 composite material Substances 0.000 claims abstract description 42
- MVLMQGYYLCWMFP-UHFFFAOYSA-N neodymium yttrium Chemical compound [Y].[Nd] MVLMQGYYLCWMFP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 230000008439 repair process Effects 0.000 claims abstract description 31
- 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 24
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 18
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 18
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 claims abstract description 14
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims abstract description 12
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims abstract description 12
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims abstract description 12
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims abstract description 12
- 238000004321 preservation Methods 0.000 claims abstract description 9
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 66
- 238000003756 stirring Methods 0.000 claims description 63
- 239000002243 precursor Substances 0.000 claims description 48
- 238000006243 chemical reaction Methods 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 35
- 229960000583 acetic acid Drugs 0.000 claims description 33
- 239000012362 glacial acetic acid Substances 0.000 claims description 33
- 238000002156 mixing Methods 0.000 claims description 30
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 24
- 238000005406 washing Methods 0.000 claims description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 20
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 17
- 239000004327 boric acid Substances 0.000 claims description 17
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims description 16
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 16
- 229930195725 Mannitol Natural products 0.000 claims description 16
- 239000000594 mannitol Substances 0.000 claims description 16
- 235000010355 mannitol Nutrition 0.000 claims description 16
- 238000002360 preparation method Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 15
- NGDQQLAVJWUYSF-UHFFFAOYSA-N 4-methyl-2-phenyl-1,3-thiazole-5-sulfonyl chloride Chemical compound S1C(S(Cl)(=O)=O)=C(C)N=C1C1=CC=CC=C1 NGDQQLAVJWUYSF-UHFFFAOYSA-N 0.000 claims description 14
- CFYGEIAZMVFFDE-UHFFFAOYSA-N neodymium(3+);trinitrate Chemical compound [Nd+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O CFYGEIAZMVFFDE-UHFFFAOYSA-N 0.000 claims description 14
- 125000000129 anionic group Chemical group 0.000 claims description 13
- 239000008367 deionised water Substances 0.000 claims description 13
- 229910021641 deionized water Inorganic materials 0.000 claims description 13
- 229920002401 polyacrylamide Polymers 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 11
- 238000005245 sintering Methods 0.000 claims description 11
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 230000007935 neutral effect Effects 0.000 claims description 10
- CMOAHYOGLLEOGO-UHFFFAOYSA-N oxozirconium;dihydrochloride Chemical compound Cl.Cl.[Zr]=O CMOAHYOGLLEOGO-UHFFFAOYSA-N 0.000 claims description 10
- 239000002244 precipitate Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 229910052845 zircon Inorganic materials 0.000 claims description 8
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 239000000047 product Substances 0.000 claims description 5
- 239000008186 active pharmaceutical agent Substances 0.000 claims description 3
- 239000000701 coagulant Substances 0.000 claims description 3
- 230000011987 methylation Effects 0.000 claims description 3
- 238000007069 methylation reaction Methods 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- 239000000376 reactant Substances 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 abstract description 11
- 230000001070 adhesive effect Effects 0.000 abstract description 11
- 239000000654 additive Substances 0.000 abstract description 4
- 238000009413 insulation Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 68
- 239000007789 gas Substances 0.000 description 9
- 239000010937 tungsten Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 229910052779 Neodymium Inorganic materials 0.000 description 5
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 5
- 229910052727 yttrium Inorganic materials 0.000 description 5
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 239000011449 brick Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000003349 gelling agent Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 150000005846 sugar alcohols Chemical class 0.000 description 1
- 229910052905 tridymite Inorganic materials 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
- C04B35/01—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
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/113—Silicon oxides; Hydrates thereof
- C01B33/12—Silica; Hydrates thereof, e.g. lepidoic silicic acid
- C01B33/14—Colloidal silica, e.g. dispersions, gels, sols
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Dispersion Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The invention relates to a lining repair material for a kiln, which comprises the following components in parts by weight: 38-52 parts of mullite powder, 24-36 parts of zirconite powder, 13-21 parts of neodymium yttrium@tungsten zirconate composite powder, 5-10 parts of aluminum dihydrogen phosphate, 1.2-2.8 parts of hydroxypropyl methylcellulose, 10-20 parts of silica sol and 15-25 parts of water. The invention prepares a lining repairing material for a kiln, wherein mullite powder, zirconite powder and neodymium yttrium boride@tungsten zirconate composite powder are used as main refractory components, and aluminum dihydrogen phosphate, hydroxypropyl methylcellulose and silica sol are used as auxiliary additives. When the mixed repairing material is specifically applied to repairing in a kiln, the repairing material has the advantages of strong adhesive force, strong heat resistance, good heat insulation and heat preservation, high strength, good wear resistance and strong crack resistance.
Description
Technical Field
The invention relates to the field of refractory materials, in particular to a lining repair material for a kiln.
Background
Kiln is a device for heating materials at high temperature, such as rotary kiln, roller kiln, etc., which all have a common feature that continuous high temperature heating is required. Most objects are corroded at high temperature for a long time, and high-temperature-resistant materials commonly used for kiln linings include castable, insulating bricks, refractory cement, aluminum silicate fibers and the like, and under the long-time erosion action of high temperature, friction between the refractory bricks and sintered materials is added, so that the materials of the kiln linings are gradually cracked to generate cracks, high-temperature heat is caused to directly heat furnace body base material steel, and leaks are generated to damage the kiln. Furnace wall cracking can cause significant problems such as loosening and falling of refractory bricks; the temperature of the furnace wall bracket rises and even reds; air leakage of the furnace wall; hearth flame is ejected from the cracks, etc.
Conventional furnace wall crack remedying measures adopt asbestos ropes for filling, and a layer of refractory cement and asbestos powder mortar is coated outside, however, the remedying measures are usually weak, when the furnace wall is expanded at high temperature or cooled and shut down, plugging materials are easy to loose and fall off and crack again, and the strength is also low. The kiln lining repair is a step required by the kiln in the using process, and the key point is to find a good repair material which is required to have the performances of high temperature resistance, wear resistance, strong adhesive force, crack resistance, heat insulation and heat preservation.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a lining repairing material for a kiln.
The aim of the invention is realized by adopting the following technical scheme:
The lining repair material for the kiln comprises the following components in parts by weight:
38-52 parts of mullite powder, 24-36 parts of zirconite powder, 13-21 parts of neodymium yttrium@tungsten zirconate composite powder, 5-10 parts of aluminum dihydrogen phosphate, 1.2-2.8 parts of hydroxypropyl methylcellulose, 10-20 parts of silica sol and 15-25 parts of water.
Preferably, in the mullite powder, the mass fraction of Al 2O3 is 45.2-46.5%, and the mass fraction of SiO 2 is 48.7-49.6%; the relative density of the mullite powder is 3.35-3.38g/cm 3, and the refractoriness is more than or equal to 1910 ℃.
Preferably, the mullite powder has a particle size of 0.5-1mm.
Preferably, in the components of the zircon powder, the mass fraction of ZrO 2 is 63.5-65.7%, the mass fraction of SiO2 is 33.2-34.6%, the relative density of mullite powder is 3.51-3.55g/cm 3, and the refractoriness is not less than 1790 ℃.
Preferably, the zircon powder has a particle size of 300-500 μm.
Preferably, the density of the aluminum dihydrogen phosphate is 2.56g/cm 3 (20 ℃), and the particle size is 100-200 μm.
Preferably, the degree of methylation MS of the hydroxypropyl methylcellulose is 27% -28% and the degree of hydroxypropylation DS is 6% -8%.
Preferably, the preparation method of the neodymium yttrium@tungsten zirconate composite powder comprises the following steps:
s1, combining and reacting ammonium tungstate and zirconium oxychloride serving as reactants and anionic polyacrylamide serving as a coagulant in acid liquor to obtain a first precursor;
s2, mixing boric acid, mannitol and glacial acetic acid to form a first solution, and mixing neodymium nitrate, yttrium nitrate and glacial acetic acid to form a second solution;
S3, dispersing the first precursor in the first solution, then dropwise adding the second solution, and preparing a second precursor after heating reaction;
And S4, sintering the second precursor in high-temperature furnace equipment to prepare neodymium yttrium@tungsten zirconate composite powder.
Preferably, the S1 process includes:
Adding ammonium tungstate [ (NH 4)10W12O41·6H2 O ] and zirconium oxychloride (ZrOCl 2·8H2 O) into deionized water, stirring at room temperature to form a uniform solution, then gradually adding anionic polyacrylamide (molecular weight: 1600 ten thousand), heating the reaction solution to 45-55 ℃, stirring at a speed of 500-600r/min for 1-2h, dripping a hydrochloric acid solution to adjust the pH of the reaction solution to 1.0-2.0, stirring at a speed of 300-400r/min for 2-4h, filtering out a precipitate after the reaction is finished, washing until the washing solution is neutral, drying, and crushing into particles with a size of 50-60 mu m to obtain a first precursor;
wherein the mass ratio of the ammonium tungstate to the zirconium oxychloride to the deionized water is 2.9-5.8:2.2-4.4:10, and the addition amount of the anionic polyacrylamide is 3-5% of the mass of the ammonium tungstate.
Preferably, the S2 process includes:
Mixing boric acid, mannitol and glacial acetic acid in a reaction flask, gradually heating to 65-75 ℃ under stirring, and stirring for 0.5-1h under heat preservation to obtain a first solution; wherein the mass ratio of boric acid to mannitol to glacial acetic acid is 1.2-1.8:3-5:10-20;
Mixing neodymium nitrate, yttrium nitrate and glacial acetic acid, and stirring the mixture to be uniform at room temperature to obtain a second solution; wherein the mass ratio of neodymium nitrate to yttrium nitrate to glacial acetic acid is 2-2.6:1.9-2.4:6-10.
Preferably, the S3 process includes:
Dispersing the first precursor in the first solution, uniformly mixing, stirring at room temperature for 0.5-1h, gradually dropwise adding the second solution while stirring at the stirring speed of 500-600r/min, heating to 80-90 ℃ after the dropwise adding is completed, continuously stirring for 3-8h, cooling to room temperature after the reaction is completed, filtering out a precipitate product, washing until the washing solution is neutral, and drying to obtain the second precursor;
Wherein the mass ratio of the first precursor to the first solution to the second solution is 0.23-0.46:1.2-1.6:1.
Preferably, the S4 process includes:
Dispersing the second precursor in a crucible, then placing the crucible in high-temperature furnace equipment, introducing rare gas as shielding gas, heating to 600-800 ℃ at a speed of 5 ℃/min, preserving heat for 1-2h, heating to 1000-1200 ℃ at a speed of 3 ℃/min, preserving heat for 2-3h, and naturally cooling to normal temperature along with the furnace to obtain the neodymium yttrium@tungsten zirconate composite powder.
Preferably, the preparation method of the silica sol comprises the following steps:
a. Mixing tetraethoxysilane and ethanol in a flask, and fully stirring at room temperature until the tetraethoxysilane and the ethanol are uniformly dissolved to obtain a third solution; adding deionized water into the third solution, and fully stirring again to obtain a fourth solution; wherein the mass ratio of tetraethoxysilane, ethanol and deionized water is 1:1.5-2.5:1-2;
b. And (3) dropwise adding hydrochloric acid into the fourth solution until the pH value of the solution is 4.5-5.5, pouring the solution into a reaction flask, stirring the reaction flask at the temperature of 80-90 ℃ for 2-3h, stopping heating, gradually cooling to normal temperature, continuously stirring during the period, and cooling to the room temperature to obtain the silica sol.
Preferably, the using process of the lining repair material for the kiln comprises the following steps:
(1) Mixing the components to form a uniform adhesive material, and then coating the adhesive material in cracks to be repaired on the kiln lining;
(2) Drying at 100-120deg.C for 12 hr, sintering at 500-600deg.C for 2-3 hr, sintering at 1000-120deg.C for 1-2 hr, and naturally cooling with furnace.
The beneficial effects of the invention are as follows:
1. The invention prepares a lining repairing material for a kiln, wherein mullite powder, zirconite powder and neodymium yttrium boride@tungsten zirconate composite powder are used as main refractory components, and aluminum dihydrogen phosphate, hydroxypropyl methylcellulose and silica sol are used as auxiliary additives. When the mixed repairing material is specifically applied to repairing in a kiln, the repairing material has the advantages of strong adhesive force, strong heat resistance, good heat insulation and heat preservation, high strength, good wear resistance and strong crack resistance.
2. In the lining repair material for the kiln, mullite powder and zircon powder are refractory materials which are resistant to high temperature and stable in performance, and the mullite powder and the zircon powder are used as main raw materials of the repair material, so that the high temperature resistance and the stability of the material can be ensured; the neodymium yttrium boride@tungsten zirconate composite powder is a self-made refractory additive, and the self-made refractory additive is used as one of main raw materials, so that the strength, crack resistance and wear resistance of the whole material can be improved; aluminum dihydrogen phosphate, hydroxypropyl methylcellulose and silica gel are used as coagulant, and can uniformly adhere materials together.
3. The neodymium yttrium boride@tungsten zirconate composite powder prepared by the method is prepared into a tungsten zirconate precursor, the neodymium yttrium boride precursor is synthesized in situ on the precursor, and then the composite precursor is sintered under the high-temperature condition, so that the neodymium yttrium boride coated tungsten zirconate composite is prepared. Compared with the traditional negative thermal expansion material tungsten zirconate, the neodymium yttrium@tungsten zirconate composite powder maintains a certain negative thermal expansion effect and has higher strength and wear resistance, so that the performance of the overall repair material is enhanced.
4. The specific process for preparing the neodymium yttrium@tungsten zirconate composite powder comprises the following steps: the first precursor is a precursor of porous tungsten zirconate, namely, under the action of ammonium tungstate, zirconium oxychloride and anionic polyacrylamide, a tungsten zirconate colloid material is generated, the reaction environment is regulated to be acidic, the colloid material is gradually precipitated and separated out, and the porous tungsten zirconate precursor is obtained after washing and drying. The second precursor is a neodymium yttrium boride@tungsten zirconate composite precursor, and the preparation process of the second precursor comprises the steps of firstly carrying out complexation reaction by utilizing boric acid and sugar alcohol under the action of glacial acetic acid, then adding the first precursor to adsorb a large amount of boron complex, then adding a mixed salt solution of neodymium and yttrium, and forming a boron complex containing metal neodymium and yttrium to be loaded on the tungsten zirconate precursor through the combination of metal ions and the boron complex, namely the second precursor. Under the protection of rare gas, sintering the neodymium yttrium@tungsten zirconate composite precursor to finally prepare the neodymium yttrium@tungsten zirconate boride composite powder.
5. The silica sol is prepared by using tetraethoxysilane as a raw material, firstly reacting in an ethanol solution, and then performing heat treatment in an acidic solution. The silica sol prepared by the invention is also used as a gelling agent, contains abundant fine silica particles, forms a capillary network structure through hydrogen bonds in a wet state, and forms a space network structure through siloxane formed by dehydration after drying, so that the adhesiveness of the repair material is further enhanced.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
FIG. 1 is a SEM schematic view of a neodymium yttrium@tungsten zirconate composite powder prepared in example 1 of the invention.
Detailed Description
The technical scheme of the invention is described below through specific examples. It is to be understood that the mention of one or more method steps of the present invention does not exclude the presence of other method steps before and after the combination step or that other method steps may be interposed between these explicitly mentioned steps; it should also be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Moreover, unless otherwise indicated, the numbering of the method steps is merely a convenient tool for identifying the method steps and is not intended to limit the order of arrangement of the method steps or to limit the scope of the invention in which the invention may be practiced, as such changes or modifications in their relative relationships may be regarded as within the scope of the invention without substantial modification to the technical matter.
In order to better understand the above technical solution, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the invention are shown, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention is further described with reference to the following examples.
Example 1
The lining repair material for the kiln comprises the following components in parts by weight:
46 parts of mullite powder, 30 parts of zirconite powder, 16 parts of neodymium yttrium@tungsten zirconate composite powder, 8 parts of aluminum dihydrogen phosphate, 2.1 parts of hydroxypropyl methylcellulose, 15 parts of silica sol and 20 parts of water.
Wherein, in the mullite powder, the mass fraction of Al 2O3 is 45.2-46.5%, and the mass fraction of SiO 2 is 48.7-49.6%; the relative density of the mullite powder is 3.35-3.38g/cm 3, and the refractoriness is more than or equal to 1910 ℃; the grain size of the mullite powder is 0.5-1mm.
Wherein, in the components of the zircon powder, the mass fraction of ZrO 2 is 63.5-65.7%, the mass fraction of SiO 2 is 33.2-34.6%, the relative density of mullite powder is 3.51-3.55g/cm 3, and the refractoriness is not less than 1790 ℃; the zircon powder has a particle size of 300-500 μm.
Wherein the density of the aluminum dihydrogen phosphate is 2.56g/cm 3 (20 ℃), and the grain diameter is 100-200 mu m; the degree of methylation MS of hydroxypropyl methylcellulose is 28% and the degree of hydroxypropylation DS is 8%.
The preparation method of the neodymium yttrium@tungsten zirconate composite powder comprises the following steps:
S1, adding ammonium tungstate [ (NH 4)10W12O41·6H2 O ] and zirconium oxychloride (ZrOCl 2·8H2 O) into deionized water, stirring at room temperature to form a uniform solution, gradually adding anionic polyacrylamide (molecular weight: 1600 ten thousand), wherein the adding amount of the anionic polyacrylamide is 4% of the mass of the ammonium tungstate, heating the reaction solution to 50 ℃, stirring at the speed of 550r/min for 1.5h, dripping a hydrochloric acid solution to adjust the pH of the reaction solution to 1.0-2.0, carrying out heat preservation and stirring at the speed of 350r/min for 3h, filtering out a precipitate after the reaction is finished, washing until the washing solution is neutral, drying, and crushing into particles with the size of 50-60 mu m to obtain a first precursor.
S2, mixing boric acid, mannitol and glacial acetic acid in a reaction flask, gradually heating to 70 ℃ under the stirring condition, and keeping the temperature for 0.5h to obtain a first solution, wherein the mass ratio of the boric acid to the mannitol to the glacial acetic acid is 1.5:4:15; mixing neodymium nitrate, yttrium nitrate and glacial acetic acid, wherein the mass ratio of the neodymium nitrate to the yttrium nitrate to the glacial acetic acid is 2.2:2.1:10, and stirring the mixture uniformly at room temperature to obtain a second solution.
S3, dispersing the first precursor in the first solution, uniformly mixing, stirring at room temperature for 1h, gradually dropwise adding the second solution while stirring, wherein the mass ratio of the first precursor to the first solution to the second solution is 0.35:1.4:1, the stirring speed is 550r/min, heating to 90 ℃ after the dropwise adding is completed, continuously stirring for 5h, cooling to room temperature after the reaction is completed, filtering out a precipitate product, washing until the washing liquid is neutral, and drying to obtain the second precursor.
S4, dispersing a second precursor in a crucible, then placing the crucible in high-temperature furnace equipment, introducing rare gas as shielding gas, firstly heating to 700 ℃ at a speed of 5 ℃/min, preserving heat for 1h, then heating to 1100 ℃ at a speed of 3 ℃/min, preserving heat for 2h, and then naturally cooling to normal temperature along with the furnace to obtain the neodymium yttrium@tungsten zirconate composite powder.
The preparation method of the silica sol comprises the following steps:
a. Mixing tetraethoxysilane and ethanol in a flask, and fully stirring at room temperature until the tetraethoxysilane and the ethanol are uniformly dissolved to obtain a third solution; adding deionized water into the third solution, and fully stirring again to obtain a fourth solution; wherein the mass ratio of tetraethoxysilane to ethanol to deionized water is 1:2:1.5;
b. And (3) dropwise adding hydrochloric acid into the fourth solution until the pH value of the solution is 4.5-5.5, pouring the solution into a reaction flask, stirring the reaction flask at the temperature of 85 ℃ for 2 hours, stopping heating, gradually cooling to normal temperature, continuously stirring during the period, and cooling to the room temperature to obtain the silica sol.
The using process of the lining repair material for the kiln comprises the following steps of:
(1) Mixing the components to form a uniform adhesive material, and then coating the adhesive material in cracks to be repaired on the kiln lining;
(2) Drying at 110 ℃ for 12 hours, sintering at 550 ℃ for 2 hours, sintering at 1100 ℃ for 1.5 hours, and naturally cooling with a furnace.
Example 2
The lining repair material for the kiln comprises the following components in parts by weight:
38 parts of mullite powder, 36 parts of zirconite powder, 13 parts of neodymium yttrium@tungsten zirconate composite powder, 10 parts of aluminum dihydrogen phosphate, 1.2 parts of hydroxypropyl methylcellulose, 20 parts of silica sol and 15 parts of water.
Among them, mullite powder, zirconite powder, aluminum dihydrogen phosphate were the same as in example 1, and neodymium yttrium boride @ tungsten zirconate composite powder and silica sol were prepared as in example 1.
The using process of the lining repair material for the kiln comprises the following steps of:
(1) Mixing the components to form a uniform adhesive material, and then coating the adhesive material in cracks to be repaired on the kiln lining;
(2) Drying at 100deg.C for 12 hr, sintering at 500deg.C for 3 hr, sintering at 1000deg.C for 2 hr, and naturally cooling with furnace.
Example 3
The lining repair material for the kiln comprises the following components in parts by weight:
52 parts of mullite powder, 24 parts of zirconite powder, 21 parts of neodymium yttrium@tungsten zirconate composite powder, 5 parts of aluminum dihydrogen phosphate, 2.8 parts of hydroxypropyl methylcellulose, 10 parts of silica sol and 25 parts of water.
Among them, mullite powder, zirconite powder, aluminum dihydrogen phosphate were the same as in example 1, and neodymium yttrium boride @ tungsten zirconate composite powder and silica sol were prepared as in example 1.
The using process of the lining repair material for the kiln comprises the following steps of:
(1) Mixing the components to form a uniform adhesive material, and then coating the adhesive material in cracks to be repaired on the kiln lining;
(2) Drying at 120 ℃ for 12 hours, sintering at 600 ℃ for 2 hours, sintering at 1200 ℃ for 1 hour, and naturally cooling with a furnace.
Example 4
The kiln lining repair material is different from example 1 in that the preparation process of the neodymium yttrium boride@tungsten zirconate composite powder in the components is slightly different.
The preparation method of the neodymium yttrium boride@tungsten zirconate composite powder in the embodiment comprises the following steps:
S1, adding ammonium tungstate [ (NH 4)10W12O41·6H2 O ] and zirconium oxychloride (ZrOCl 2·8H2 O) into deionized water, stirring at room temperature to form a uniform solution, gradually adding anionic polyacrylamide (molecular weight: 1600 ten thousand), wherein the adding amount of the anionic polyacrylamide is 3% of the mass of the ammonium tungstate, heating the reaction solution to 45 ℃, stirring at a speed of 500r/min for 1h, dripping a hydrochloric acid solution to adjust the pH of the reaction solution to 1.0-2.0, carrying out heat preservation and stirring at a speed of 300r/min for 2h, filtering a precipitate after the reaction is finished, washing until the washing solution is neutral, and crushing into particles with a size of 50-60 mu m after drying to obtain a first precursor.
S2, mixing boric acid, mannitol and glacial acetic acid in a reaction flask, gradually heating to 65 ℃ under the stirring condition, and keeping the temperature for 0.5h to obtain a first solution, wherein the mass ratio of the boric acid to the mannitol to the glacial acetic acid is 1.2:3:10; mixing neodymium nitrate, yttrium nitrate and glacial acetic acid, wherein the mass ratio of the neodymium nitrate to the yttrium nitrate to the glacial acetic acid is 2:1.9:6, and stirring the mixture to be uniform at room temperature to obtain a second solution.
S3, dispersing the first precursor in the first solution, uniformly mixing, stirring at room temperature for 0.5h, gradually dropwise adding the second solution while stirring, wherein the mass ratio of the first precursor to the first solution to the second solution is 0.23:1.2:1, the stirring speed is 500r/min, heating to 80 ℃ after the dropwise adding is completed, continuously stirring for 3h, cooling to room temperature after the reaction is completed, filtering out a precipitate product, washing until the washing solution is neutral, and drying to obtain the second precursor.
S4, dispersing a second precursor in a crucible, then placing the crucible in high-temperature furnace equipment, introducing rare gas as shielding gas, heating to 600 ℃ at a speed of 5 ℃/min, preserving heat for 1h, heating to 1000 ℃ at a speed of 3 ℃/min, preserving heat for 2h, and naturally cooling to normal temperature along with the furnace to obtain the neodymium yttrium@tungsten zirconate composite powder.
Example 5
The kiln lining repair material is different from example 1 in that the preparation process of the neodymium yttrium boride@tungsten zirconate composite powder in the components is slightly different.
The preparation method of the neodymium yttrium boride@tungsten zirconate composite powder in the embodiment comprises the following steps:
S1, adding ammonium tungstate [ (NH 4)10W12O41·6H2 O ] and zirconium oxychloride (ZrOCl 2·8H2 O) into deionized water, stirring at room temperature to form a uniform solution, gradually adding anionic polyacrylamide (molecular weight: 1600 ten thousand), wherein the adding amount of the anionic polyacrylamide is 5% of the mass of the ammonium tungstate, heating the reaction solution to 55 ℃, stirring at 600r/min for 2h, dripping a hydrochloric acid solution to adjust the pH of the reaction solution to 1.0-2.0, carrying out heat preservation and stirring at 400r/min for 4h, filtering a precipitate after the reaction is finished, washing until the washing solution is neutral, and crushing into particles with the size of 50-60 mu m to obtain a first precursor.
S2, mixing boric acid, mannitol and glacial acetic acid in a reaction flask, gradually heating to 75 ℃ under the condition of stirring, and keeping the temperature for 1h to obtain a first solution, wherein the mass ratio of the boric acid to the mannitol to the glacial acetic acid is 1.8:5:20; mixing neodymium nitrate, yttrium nitrate and glacial acetic acid, wherein the mass ratio of the neodymium nitrate to the yttrium nitrate to the glacial acetic acid is 2.6:2.4:10, and stirring the mixture uniformly at room temperature to obtain a second solution.
S3, dispersing the first precursor in the first solution, uniformly mixing, stirring at room temperature for 1h, gradually dropwise adding the second solution while stirring, wherein the mass ratio of the first precursor to the first solution to the second solution is 0.46:1.6:1, the stirring speed is 600r/min, heating to 90 ℃ after the dropwise adding is completed, continuously stirring for 8h, cooling to room temperature after the reaction is completed, filtering out a precipitate product, washing until the washing liquid is neutral, and drying to obtain the second precursor.
S4, dispersing a second precursor in a crucible, then placing the crucible in high-temperature furnace equipment, introducing rare gas as shielding gas, heating to 800 ℃ at a speed of 5 ℃/min, preserving heat for 2 hours, heating to 1200 ℃ at a speed of 3 ℃/min, preserving heat for 3 hours, and naturally cooling to normal temperature along with the furnace to obtain the neodymium yttrium@tungsten zirconate composite powder.
Comparative example 1
A kiln lining repair material was different from example 1 in that the neodymium yttrium boride @ tungsten zirconate composite powder in the composition was replaced with tungsten zirconate powder, and the first precursor (i.e., tungsten zirconate powder) obtained in step S1 of the preparation of the neodymium yttrium boride @ tungsten zirconate composite powder in example 1 was prepared.
Comparative example 2
The lining repair material for kiln is different from example 1 in that the composite powder of neodymium yttrium boride @ tungsten zirconate in the components is replaced by the powder of neodymium boride @ tungsten zirconate, and the preparation process of the powder of neodymium boride @ tungsten zirconate comprises the following steps:
S1, preparing the same neodymium yttrium boride@tungsten zirconate composite powder as in the embodiment 1;
S2, mixing boric acid, mannitol and glacial acetic acid in a reaction flask, gradually heating to 70 ℃ under the stirring condition, and keeping the temperature for 0.5h to obtain a first solution, wherein the mass ratio of the boric acid to the mannitol to the glacial acetic acid is 1.5:4:15; mixing neodymium nitrate and glacial acetic acid, wherein the mass ratio of the neodymium nitrate to the glacial acetic acid is 4.3:10, and stirring the mixture to be uniform at room temperature to obtain a second solution.
The processing of S3 and S4 is the same as that of the preparation of the neodymium yttrium boride @ tungsten zirconate composite powder of example 1, except that the final product is neodymium boride @ tungsten zirconate powder.
Comparative example 3
The lining repair material for kiln is different from example 1 in that the composite powder of neodymium yttrium boride @ tungsten zirconate in the components is replaced by the powder of yttrium boride @ tungsten zirconate, and the preparation process of the powder of yttrium boride @ tungsten zirconate comprises the following steps:
S1, preparing the same neodymium yttrium boride@tungsten zirconate composite powder as in the embodiment 1;
s2, mixing boric acid, mannitol and glacial acetic acid in a reaction flask, gradually heating to 70 ℃ under the stirring condition, and keeping the temperature for 0.5h to obtain a first solution, wherein the mass ratio of the boric acid to the mannitol to the glacial acetic acid is 1.5:4:15; mixing yttrium nitrate and glacial acetic acid, wherein the mass ratio of the yttrium nitrate to the glacial acetic acid is 4.3:10, and stirring the mixture to be uniform at room temperature to obtain a second solution.
The processing of S3 and S4 is the same as that of the preparation of the neodymium yttrium boride @ tungsten zirconate composite powder of example 1, except that the final product is yttrium boride @ tungsten zirconate powder.
Experimental example
The repair materials obtained in example 1 and comparative examples 1 to 3 were coated on a kiln liner, dried at 100℃for 12 hours, sintered at 500℃for 3 hours, sintered at 1000℃for 2 hours, and finally naturally cooled with a furnace, and then tested for compressive strength, flexural strength, line change rate after firing, high temperature resistance, wear resistance, and thermal shock stability, the compressive strength standard reference GB/T5072-2008, flexural strength reference GB/T3002-1982, line change rate after firing (1350 ℃,3 hours) reference GB/T3997.1-1998, wear resistance (amount of wear at ordinary temperature) reference GB/T18301-2001, thermal shock stability (1100 ℃) reference YB/T3761-95, and the test results are summarized in Table 1 as follows:
TABLE 1 Performance of different liner repair materials
| Example 1 | Comparative example 1 | Comparative example 2 | Comparative example 3 | |
| Compressive Strength at 25 ℃ (MPa) | 296 | 225 | 273 | 281 |
| Flexural strength (MPa) at 1100 DEG C | 41.8 | 32.0 | 35.7 | 39.2 |
| Post-firing line change Rate (%) | ＜0.2 | 0.3-0.4 | ＜0.2 | 0.2-0.3 |
| Sample abrasion loss (cm 3) | 2.12 | 4.35 | 2.30 | 2.72 |
| High temperature resistance (DEG C) | ＞1800 | 1700-1750 | ＞1800 | ＞1800 |
| Thermal shock stability (secondary) | 58 | 32 | 47 | 55 |
As can be seen from table 1, the lining repair material prepared in example 1 exhibited higher fracture resistance and compressive strength, and a smaller line change rate after firing indicated that the dimensional stability was better, and a smaller abrasion loss of the sample indicated that the abrasion resistance was better, and in addition, the lining repair material had excellent high temperature resistance and thermal stability crack resistance.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms should not be understood as necessarily being directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (6)
1. The lining repair material for the kiln is characterized by comprising the following components in parts by weight:
38-52 parts of mullite powder, 24-36 parts of zirconite powder, 13-21 parts of neodymium yttrium@tungsten zirconate composite powder, 5-10 parts of aluminum dihydrogen phosphate, 1.2-2.8 parts of hydroxypropyl methylcellulose, 10-20 parts of silica sol and 15-25 parts of water;
the preparation method of the neodymium yttrium boride@tungsten zirconate composite powder comprises the following steps:
s1, combining and reacting ammonium tungstate and zirconium oxychloride serving as reactants and anionic polyacrylamide serving as a coagulant in acid liquor to obtain a first precursor;
s2, mixing boric acid, mannitol and glacial acetic acid to form a first solution, and mixing neodymium nitrate, yttrium nitrate and glacial acetic acid to form a second solution;
S3, dispersing the first precursor in the first solution, then dropwise adding the second solution, and preparing a second precursor after heating reaction;
S4, sintering the second precursor in high-temperature furnace equipment to prepare neodymium yttrium@tungsten zirconate composite powder;
The S1 process comprises the following steps:
Adding ammonium tungstate and zirconium oxychloride into deionized water, stirring at room temperature to form a uniform solution, then gradually adding anionic polyacrylamide, heating the reaction solution to 45-55 ℃, stirring at the speed of 500-600r/min for 1-2h, then dripping hydrochloric acid solution to adjust the pH of the reaction solution to 1.0-2.0, carrying out heat preservation and stirring at the speed of 300-400r/min for 2-4h, filtering out a precipitate after the reaction is finished, washing until the washing solution is neutral, drying and crushing into particles with the size of 50-60 mu m to obtain a first precursor;
Wherein the mass ratio of the ammonium tungstate to the zirconium oxychloride to the deionized water is 2.9-5.8:2.2-4.4:10, and the addition amount of the anionic polyacrylamide is 3-5% of the mass of the ammonium tungstate;
the S2 process comprises the following steps:
Mixing boric acid, mannitol and glacial acetic acid in a reaction flask, gradually heating to 65-75 ℃ under stirring, and stirring for 0.5-1h under heat preservation to obtain a first solution; wherein the mass ratio of boric acid to mannitol to glacial acetic acid is 1.2-1.8:3-5:10-20;
Mixing neodymium nitrate, yttrium nitrate and glacial acetic acid, and stirring the mixture to be uniform at room temperature to obtain a second solution; wherein the mass ratio of neodymium nitrate to yttrium nitrate to glacial acetic acid is 2-2.6:1.9-2.4:6-10;
The S3 process comprises the following steps:
Dispersing the first precursor in the first solution, uniformly mixing, stirring at room temperature for 0.5-1h, gradually dropwise adding the second solution while stirring at the stirring speed of 500-600r/min, heating to 80-90 ℃ after the dropwise adding is completed, continuously stirring for 3-8h, cooling to room temperature after the reaction is completed, filtering out a precipitate product, washing until the washing solution is neutral, and drying to obtain the second precursor;
Wherein the mass ratio of the first precursor to the first solution to the second solution is 0.23-0.46:1.2-1.6:1;
The S4 process comprises the following steps:
Dispersing the second precursor in a crucible, then placing the crucible in high-temperature furnace equipment, introducing rare gas as shielding gas, heating to 600-800 ℃ at a speed of 5 ℃/min, preserving heat for 1-2h, heating to 1000-1200 ℃ at a speed of 3 ℃/min, preserving heat for 2-3h, and naturally cooling to normal temperature along with the furnace to obtain the neodymium yttrium@tungsten zirconate composite powder.
2. The lining repair material for a kiln according to claim 1, wherein the mullite powder comprises 45.2-46.5% by mass of Al 2O3 and 48.7-49.6% by mass of SiO 2; the relative density of the mullite powder is 3.35-3.38g/cm 3, and the refractoriness is more than or equal to 1910 ℃; the grain size of the mullite powder is 0.5-1mm.
3. The lining repair material for a kiln according to claim 1, wherein the zircon powder comprises, by mass, 63.5-65.7% of ZrO 2, 33.2-34.6% of SiO 2, the mullite powder has a relative density of 3.51-3.55g/cm 3 and a refractoriness of not less than 1790 ℃; the zircon powder has a particle size of 300-500 μm.
4. The kiln liner repair material according to claim 1, wherein the aluminum dihydrogen phosphate has a density of 2.56g/cm 3 at 20 ℃ and a particle size of 100 to 200 μm.
5. The kiln liner repair material according to claim 1, wherein the hydroxypropyl methylcellulose has a degree of methylation MS of 27% -28% and a degree of hydroxypropylation DS of 6% -8%.
6. The kiln lining repair material according to claim 1, wherein the silica sol preparation method comprises:
a. Mixing tetraethoxysilane and ethanol in a flask, and fully stirring at room temperature until the tetraethoxysilane and the ethanol are uniformly dissolved to obtain a third solution; adding deionized water into the third solution, and fully stirring again to obtain a fourth solution; wherein the mass ratio of tetraethoxysilane, ethanol and deionized water is 1:1.5-2.5:1-2;
b. And (3) dropwise adding hydrochloric acid into the fourth solution until the pH value of the solution is 4.5-5.5, pouring the solution into a reaction flask, stirring the reaction flask at the temperature of 80-90 ℃ for 2-3h, stopping heating, gradually cooling to normal temperature, continuously stirring during the period, and cooling to the room temperature to obtain the silica sol.
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