CN116178993B - Spray paint for spherical roof of iron-making hot blast stove and baking method thereof - Google Patents
Spray paint for spherical roof of iron-making hot blast stove and baking method thereof Download PDFInfo
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- CN116178993B CN116178993B CN202310190954.2A CN202310190954A CN116178993B CN 116178993 B CN116178993 B CN 116178993B CN 202310190954 A CN202310190954 A CN 202310190954A CN 116178993 B CN116178993 B CN 116178993B
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- 239000003973 paint Substances 0.000 title claims description 32
- 239000007921 spray Substances 0.000 title claims description 29
- 238000000034 method Methods 0.000 title claims description 18
- 239000000843 powder Substances 0.000 claims abstract description 60
- 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 54
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 54
- 238000005507 spraying Methods 0.000 claims abstract description 47
- 238000005245 sintering Methods 0.000 claims abstract description 28
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 239000002184 metal Substances 0.000 claims abstract description 18
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 18
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000010443 kyanite Substances 0.000 claims abstract description 17
- 229910052850 kyanite Inorganic materials 0.000 claims abstract description 17
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims description 65
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 25
- 239000011230 binding agent Substances 0.000 claims description 20
- 238000002844 melting Methods 0.000 claims description 19
- 230000008018 melting Effects 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 18
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 13
- 239000008188 pellet Substances 0.000 claims description 13
- 239000004743 Polypropylene Substances 0.000 claims description 12
- -1 polypropylene Polymers 0.000 claims description 12
- 229920001155 polypropylene Polymers 0.000 claims description 12
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 9
- 239000000654 additive Substances 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims description 7
- 230000035699 permeability Effects 0.000 abstract description 35
- 239000011819 refractory material Substances 0.000 abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 29
- 239000000463 material Substances 0.000 description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 20
- 230000000694 effects Effects 0.000 description 18
- 239000011159 matrix material Substances 0.000 description 17
- 230000008092 positive effect Effects 0.000 description 17
- 238000010276 construction Methods 0.000 description 15
- 239000002253 acid Substances 0.000 description 14
- 239000007789 gas Substances 0.000 description 10
- 239000000377 silicon dioxide Substances 0.000 description 10
- 230000001976 improved effect Effects 0.000 description 9
- 239000002994 raw material Substances 0.000 description 9
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- 239000013078 crystal Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000012071 phase Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 238000011049 filling Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000008646 thermal stress Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
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- 238000002425 crystallisation Methods 0.000 description 3
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- 238000001035 drying Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 230000000979 retarding effect Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
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- 239000011362 coarse particle Substances 0.000 description 2
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- 238000005265 energy consumption Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910008051 Si-OH Inorganic materials 0.000 description 1
- 229910006358 Si—OH Inorganic materials 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910001679 gibbsite Inorganic materials 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000013035 low temperature curing Methods 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- HLPHHOLZSKWDAK-UHFFFAOYSA-M sodium;formaldehyde;naphthalene-1-sulfonate Chemical compound [Na+].O=C.C1=CC=C2C(S(=O)(=O)[O-])=CC=CC2=C1 HLPHHOLZSKWDAK-UHFFFAOYSA-M 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052726 zirconium 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
-
- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Products (AREA)
- Paints Or Removers (AREA)
Abstract
The application relates to the technical field of refractory materials, in particular to a spray coating for a spherical roof of an iron-making hot blast stove. The spray coating comprises a first component, wherein the first component comprises electric mullite aggregate, electric mullite powder, kyanite, metal silicon powder and a sintering aid; the electric smelting mullite powder comprises 45-60 wt% of electric smelting mullite aggregate, 10-30 wt% of electric smelting mullite powder, 5-10 wt% of kyanite, 1-5 wt% of metal silicon powder and 10-16 wt% of sintering aid. The technical problem that current spray coating air permeability is too high has been solved to this application content.
Description
Technical Field
The application relates to the technical field of refractory materials, in particular to a spray coating for a spherical roof of an iron-making hot blast stove.
Background
In the energy consumption of the long-flow steel production process, the ratio of the blast furnace ironmaking process is about 70%, wherein the hot blast stove can provide about one fourth of the heat required by blast furnace smelting to replace the heat generated by burning coke and coal dust, so that the higher the air temperature level is, the larger the substitution contribution is; and the physical heat brought into the blast furnace by hot air can be completely utilized, so that the hot air furnace using the blast furnace gas with low heat value can obtain and ensure that the blast furnace can use high air temperature, and the blast furnace is more and more paid attention in the energy double-control process. The temperature of the vault of the hot blast stove needs to be increased when the air temperature level is increased, thermal NOx is generated by the vault of the hot blast stove under the high temperature condition, when the temperature exceeds 1300 ℃, the generated NOx gas is accelerated obviously, and the NOx gas is combined with water vapor at the place with low temperature on the inner surface of the vault stove casing, so that a severely corroded nitrate solution is formed, and inter-crystal stress corrosion is generated on the vault stove casing.
At present, in order to reduce the intergranular stress corrosion hazard of the vault furnace shell of the hot blast stove, the vault furnace shell is generally coated with an intergranular stress preventing coating firstly and then with an acid-resistant spray coating. Because the refractory materials have certain air permeability, NOx gas can pass through the refractory materials to reach the furnace shell and corrode weak parts of the furnace shell, which are protected by the intergranular stress-resistant coating, the acid-resistant spray coating only relates to the acid resistance problem of the spray coating at present, and the problems of acid resistance of the spray coating and the reduction of the passing of the NOx gas are not considered at the same time, so that the development of the acid-resistant spray coating with low air permeability is very necessary.
Disclosure of Invention
The application provides a spray paint for a spherical roof of an iron-making hot blast stove, which aims to solve the technical problem that the air permeability of the existing spray paint is too high.
In a first aspect, the application provides a spray coating for the dome of an iron-making hot blast stove, the spray coating comprises a first component,
the first component comprises electric melting mullite aggregate, electric melting mullite powder, kyanite, metal silicon powder and sintering aid; wherein,
the electric smelting mullite aggregate comprises 45-60 wt%, 10-30 wt% of electric smelting mullite powder, 5-10 wt% of kyanite, 1-5 wt% of metal silicon powder and 10-16 wt% of sintering aid.
Optionally, the granularity of the fused mullite aggregate is 0.08mm-3mm; wherein,
the content of the electric melting mullite aggregate with the granularity of 1mm-3mm is 15-25 wt%;
the content of the electric melting mullite aggregate with the granularity of 0.08-1 mm is 30-40 wt%.
Optionally, the granularity of the fused mullite powder is less than or equal to 0.08mm.
Optionally, the kyanite has a particle size of 0.55-0.18mm.
Optionally, the granularity of the metal silicon powder is less than or equal to 0.08mm.
Optionally, the sintering aid comprises alpha-Al 2 O 3 Micropowder and SiO 2 Micro powder; wherein,
the alpha-Al 2 O 3 The granularity of the micro powder is less than or equal to 5 mu m, and the alpha-Al 2 O 3 The content of the micro powder is 5-8 wt%;
the SiO is 2 The granularity of the micro powder is less than or equal to 1 mu m, siO 2 The content of the micro powder is 5-8 wt%.
Optionally, the components of the spray coating further comprise a second component, wherein the second component comprises a binding agent and an additive; wherein,
the content of the binder is 0.05 to 0.1 parts by weight relative to 1 part by weight of the first component;
the binder is contained in an amount of 0.005 to 0.01 parts by weight relative to 1 part by weight of the first component.
Optionally, the binder is solid hydrated alumina, and the solid hydrated alumina has a particle size d 50 ≤3μm。
Optionally, the additive is polypropylene pellets and FDN-CL; wherein,
the content of the binder is 0.0002 parts by weight to 0.0008 parts by weight with respect to 1 part by weight of the first component;
the binder is contained in an amount of 0.002 to 0.006 parts by weight relative to 1 part by weight of the first component.
In a second aspect, the application provides a baking method of a spray paint for a dome of an iron-making hot blast stove, the method comprising:
spraying the spray paint according to any embodiment of the first aspect on a designated position;
under the condition of a first set heating rate, carrying out first heating on the spray paint at a designated position, and then carrying out first heat preservation;
under the condition of a second set heating rate, carrying out second heating on the spray coating, and then carrying out second heat preservation; wherein,
the first set heating rate is 5-8 deg.C/h, and the second set heating rate is 8-10 deg.C/h.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
according to the spray paint for the spherical roof of the iron-making hot blast stove, through reasonable design of raw materials, the spray paint has the characteristics of low air permeability, strong acid erosion resistance, high strength and the like, and the air permeability of the spray paint is only 1/5-1/10 of that of a traditional acid-resistant spray paint, so that the risk that NOx gas generated in the hot blast stove permeates the spray paint can be greatly reduced, the risk that the boiler shell is subjected to intergranular stress corrosion by the NOx gas permeating the spray paint to cause safety accidents such as hot air burning of the hot blast stove is avoided, and the spray paint is particularly suitable for the spherical roof part of the top-fired hot blast stove with high air temperature.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic flow chart of a baking method of a spray coating for a dome of an iron-making hot blast stove according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
Various embodiments of the present application may exist in a range format; it should be understood that the description in a range format is merely for convenience and brevity and should not be interpreted as a rigid limitation on the scope of the application. It is therefore to be understood that the range description has specifically disclosed all possible sub-ranges and individual values within that range. For example, it should be considered that a description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5, and 6, wherever applicable. In addition, whenever a numerical range is referred to herein, it is meant to include any reference number (fractional or integer) within the indicated range.
In this application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used specifically to refer to the orientation of the drawing in the figures. In addition, in the description of the present application, the terms "include", "comprise", "comprising" and the like mean "including but not limited to". Relational terms such as "first" and "second", and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Herein, "and/or" describing an association relationship of an association object means that there may be three relationships, for example, a and/or B, may mean: a alone, a and B together, and B alone. Wherein A, B may be singular or plural. Herein, "at least one" means one or more, and "a plurality" means two or more. "at least one", "at least one" or the like refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, "at least one (individual) of a, b, or c," or "at least one (individual) of a, b, and c," may each represent: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple, respectively.
Unless specifically indicated otherwise, the various raw materials, reagents, instruments, equipment, and the like used in this application are commercially available or may be prepared by existing methods.
In a first aspect, the application provides a spray coating for the dome of an iron-making hot blast stove, the spray coating comprises a first component,
the first component comprises electric melting mullite aggregate, electric melting mullite powder, kyanite, metal silicon powder and sintering aid; wherein,
the electric smelting mullite aggregate comprises 45-60 wt%, 10-30 wt% of electric smelting mullite powder, 5-10 wt% of kyanite, 1-5 wt% of metal silicon powder and 10-16 wt% of sintering aid.
The electric melting mullite is prepared by melting raw materials in an electric arc furnace, cooling and crystallizing from the melt, and the mineral phase composition is generally mullite crystal and glass phase. The mullite aggregate of the traditional spray coating is generally sintered mullite, and compared with the sintered mullite, the fused mullite has perfect crystal growth, large crystal grains, fewer defects and hundreds of times of crystal sizes of the sintered mullite, so that the high-temperature mechanical property and the erosion resistance are relatively good.
The positive effect of controlling the content of the electrofused mullite aggregate to be 45-60 wt%: the aggregate forms the particle part of the spray coating and mainly plays a role in supporting the framework. If the content of the fused mullite aggregate is too high, the aggregate particles cannot be filled with enough fine powder to a certain extent, so that the gaps are too many, the structure is loose, the strength is affected and the air permeability is increased; if the content of the fused mullite aggregate is too low, the overall strength of the material is somewhat lower, because the strength of individual aggregate particles is generally greater than the strength of the combination of the fine powders of the same volume, and if the content of the aggregate is too low, the material is composed of a large amount of fine powders and the strength is not high. Specifically, the content of the fused mullite aggregate may be 45 wt%, 47 wt%, 49 wt%, 51 wt%, 53 wt%, 55 wt%, 57 wt%, or the like.
The positive effect of controlling the content of the electric melting mullite powder to be 10-30 wt%: the powder is mainly used for filling gaps among particles and sintering other micro powder into a matrix part. If the content of the fused mullite powder is too high or too low, the strength of the material is reduced to some extent. Specifically, the content of the fused mullite powder may be 10 wt%, 15 wt%, 20 wt%, 25wt%, 30 wt%, or the like.
The positive effect of controlling the content of kyanite to be 5-10 wt%: kyanite is a high-alumina mineral raw material and has the characteristics of acid and alkali resistance, corrosion resistance, strong impact resistance, good electrical insulation performance and the like. Can decompose at high temperature to produce mullite and SiO 2 Meanwhile, with obvious volume expansion, the expansion effect can be utilized to counteract the firing shrinkage of the spray coating at high temperature, so that the material has relative stability in volume. If the content of kyanite is too high, the volume expansion of the material at high temperature can be too large to a certain extent, other surrounding materials can be crushed, and the integral structure of the construction body is damaged; if the content of kyanite is too low, the volume expansion of the material at high temperature cannot offset the shrinkage after firing, shrinkage cracks can appear in the material, the air permeability is increased, and even high-temperature gas can be leaved out of the cracks, so that the use safety is affected. Specifically, the content of kyanite may be 5wt%, 6 wt%, 7 wt%, 8wt%, 9 wt%, 10 wt%, or the like.
The positive effect of controlling the content of the metal silicon powder to be 1-5 wt%: and the wettability with water is very low, and after the spray coating is constructed, pores in the spray coating can be filled with metal silicon powder in a large amount, so that the porosity of the spray coating is reduced, and the volume density of the spray coating is increased. And when the spray coating is heated in the hot blast stove, metal silicon can generate a certain glass phase, and when the temperature is reduced, the glass phase is solidified to block pores on the surface of the material, so that the air permeability of the spray coating is reduced. If the content of the metal silicon powder is too high, excessive glass phase generated at high temperature can be caused to a certain extent, the material is softened, the strength is reduced, and fracture is possibly generated; if the content of the metal silicon powder is too low, pores in the material cannot be filled with the metal silicon powder to some extent, and the air permeability of the material is increased. Specifically, the content of the metal silicon powder may be 1 wt%, 2wt%, 3 wt%, 4 wt%, 5wt%, or the like.
The positive effect of controlling the content of the sintering aid to be 10-16 wt%: because mullite is difficult to sinter, after the silicon micropowder and the alpha-Al 2O3 micropowder are added, an in-situ mullite reaction ring belt which is distributed around the particles is formed at the joint of the raw material particles and the matrix, and the particles and the matrix are combined into a whole to promote sintering. In addition, the micro powder has the function of filling the gaps of particles, so that the large air holes are changed into small air holes, and some communicated air holes can be possibly closed, more closed air holes are formed, and the overall air permeability of the spray coating is reduced. If the content of the sintering aid is too high, the material is over-sintered to some extent. By "sintering" is meant that at elevated temperatures, the refractory solid particles are inter-bonded, the grains grow, the voids and grain boundaries become progressively smaller, the total volume of which shrinks and the density increases through mass transfer, and finally a dense polycrystalline sintered body having a certain microstructure is formed. By "overfire" is meant sintering at too high a sintering temperature, too long a sintering time, or too high a sintering aid content, which results in deterioration of the final properties of the product. The over-burned product is easy to deform, the size is not in accordance with the requirement, and the blank body has bubbles, etc. If the content of the sintering aid is too low, the mullite grains are difficult to sinter to a certain extent, i.e. the final spray coating cannot be a compact polycrystalline sintered body with a certain microstructure, but is a loose and non-strong material. Specifically, the content of the sintering aid may be 10 wt%, 12 wt%, 14 wt%, 16 wt%, or the like.
In some embodiments, the electrically fused mullite aggregate has a particle size of 0.08mm to 3mm; wherein,
the content of the electric melting mullite aggregate with the granularity of 1mm-3mm is 15-25 wt%;
the content of the electric melting mullite aggregate with the granularity of 0.08-1 mm is 30-40 wt%.
The positive effect of controlling the granularity of the fused mullite aggregate to be 0.08mm-3mm is that: the uniformity and compactness of material mixing are ensured. Specifically, the content of the electrically fused mullite aggregate having a particle size of 1mm to 3mm may be 15 wt%, 20 wt%, 25wt%, or the like, and the particle size may be 1mm, 2mm, 3mm, or the like; the content of the fused mullite aggregate having a particle size of 0.08mm to 1mm may be 30 wt%, 35 wt%, 40 wt%, etc., and the particle size may be 0.08mm, 0.09mm, 1mm, etc.
In some embodiments, the fused mullite powder has a particle size of 0.08mm or less.
In the electric melting mullite powder component, al 2 O 3 The content of (C) is more than or equal to 68 weight percent, siO 2 The content of (C) is more than or equal to 25 weight percent. Specifically, the particle size may be 0.08mm, 0.07mm, 0.06mm, etc.
In some embodiments, the kyanite has a particle size of 0.55mm to 0.18mm.
Al in the kyanite component 2 O 3 The content of (2) is more than or equal to 50 weight percent, siO 2 The content of (2) is more than or equal to 22wt%. In particular, the particle size may be 0.55mm, 0.52mm, 0.50mm, 0.48mm, 0.46mm, 0.44mm, 0.18mm, etc.
In some embodiments, the metal silicon powder has a particle size of 0.08mm or less.
The Si content in the silicon powder component is more than or equal to 98 weight percent, and specifically, the granularity can be 0.08mm, 0.07mm, 0.06mm and the like.
The particle size of the different materials of the first component is controlled, and the positive effects are that: the control amounts of the three particle size ratios of 1mm-3mm, 0.08mm-1mm and less than or equal to 0.08mm are collectively called as reasonable particle size distribution problem of the refractory material. These three particle sizes may be referred to as large particles, medium particles, and fine powder. When the particles in the refractory pug are stacked, a certain amount of medium particles are generally added into the large particles to fill gaps among the large particles, and finally, fine powder fills gaps remained by the large particles and the medium particles, so that the gaps among the stacked objects can be further reduced, and the closest stacking of the pugs is achieved. In the process of closest packing of pugs, coarse, medium and fine raw materials are generally indispensable, if all raw materials are coarse particles, gaps among particles are large, adhesion is poor, green body density is low, porosity is high, plasticity is low during molding, and green bodies are difficult to manufacture. If the raw materials are all fine particles, although the gaps among the particles are smaller and firmly bonded, the porosity is lower, the bulk density of the raw material fine powder is relatively lower, the bulk density required during forming and blank making can not be achieved, and the existence of coarse particles plays a role in supporting a framework, so that the strength of a formed blank is not high; if the grain composition of multiple components (more than 3 granularity) is considered, the porosity of the obtained pug is smaller, but in actual production, as the diameter ratio of each grain is continuously reduced, the effect is obviously weakened, difficulty is brought to the production process, the energy consumption of equipment is increased, the process cost is further increased, and the air permeability of the spray coating is not improved.
According to theoretical calculation and experimental results, the optimal mass percentages of the three component particles in the spray paint pug are obtained. That is, the mud with the three particle sizes in such a proportion can achieve the most reasonable particle size distribution, and has the positive effects that: the coating has better plasticity, and can reach the state of higher density, lower porosity and higher blank strength.
In some embodiments, the burn aid comprises alpha-Al 2 O 3 Micropowder and SiO 2 Micro powder; wherein the alpha-Al 2 O 3 The granularity of the micro powder is less than or equal to 5 mu m, and the alpha-Al 2 O 3 The content of the micro powder is 5-8 wt%;
the SiO is 2 The granularity of the micro powder is less than or equal to 1 mu m, siO 2 The content of the micro powder is 5-8 wt%.
Controlling alpha-Al 2 O 3 Positive effect of the granularity of the micro powder being less than or equal to 5 mu m: the smaller the granularity of the alumina micropowder is, the higher the activity is, the temperature of the liquid phase can be reduced above 1000 ℃, the sintering of the matrix is promoted, and the strength and the wear resistance are improved. If the particle size is too large, the effect of promoting sintering and improving strength is somewhat weak. Specifically, the particle size may be 5 μm, 4 μm, 3 μm, etc.
Controlling alpha-Al 2 O 3 The content of the micro powder is 5-8 wt% of the positive effects: sintering promotion, strength and wear resistance improvement, if alpha-Al 2 O 3 The excessively high content of the micro powder can cause the obvious self-agglomeration phenomenon to a certain extent, and on the one hand, the friction force among all the material components is increased to influence the filling effect, so that the porosity is increased and the strength is reduced. If alpha-Al 2 O 3 The content of the micro powder is too low, so that the effect of promoting sintering and improving strength and wear resistance can not be achieved to a certain extent. Specifically, the content may be 5wt%, 6 wt%, 7 wt%, 8wt%, or the like.
Control of SiO 2 The particle size of the micro powder is less than or equal to 1 mu m, and has the positive effects that: the fine silica powder, also called silica fume, is usually a by-product of smelting metallic silicon or ferrosilicon, and can be collected by producing metallic silicon. SiO as required by the invention 2 The micro powder is silica micro powder collected during the production of desilication zirconium by zirconite, has relatively small average grain diameter, standard sphere shape morphology and higher chemical activity. The alkaline oxide containing impurities has low content, so that the pH value in the aqueous solution is relatively low, the adhesiveness of the spray coating can be improved, and the coating can be firmly adhered to a construction body. If the particle size is too large, the effect of the silica fine powder is somewhat weak. Specifically, the particle size may be 0.5 μm, 1 μm, or the like.
Control of SiO 2 The content of the micro powder is 5-8 wt% of the positive effects: the silica micropowder has an amorphous crystal structure due to the special production process, and broken bonds are easily formed on the surface of the particles. Because of the existence of bond breaking, the silicon dioxide micro powder can easily adsorb OH-in water in the water solution to form Si-OH, and is dissociated into Si-O-and H+ in the water solution. Due to its relatively high particle sizeSmall (micron-sized), silica micropowder readily forms a micelle structure with an electric double layer in aqueous solution. The silica micropowder with higher activity can adsorb OH-in aqueous solution, and a large number of hydroxyl groups are formed on the particle surface. In low-temperature curing, the silica micropowder can undergo dehydration reaction to form-Si-O-Si-bond bonding among particles, so that the demolding strength of the castable is improved. The silica micropowder can become liquid phase at high temperature, and the viscosity of mass transfer among particles is reduced, so that the mass transfer rate is enhanced, and sintering among particles is promoted. Therefore, the castable doped with the silica micropowder can promote sintering of matrixes in the castable at 800 ℃, so that the bonding capability of staggered interlocking among particles is enhanced, and the medium-temperature strength of the castable is improved. The examples of the present application establish by experiment that this ratio of SiO 2 The micro powder can act to the greatest extent, if SiO 2 The excessively high content of the micro powder can lead to the following SiO after the addition amount of the micro powder exceeds a certain amount 2 The addition amount of the superfine powder is increased, and the viscosity of the system is continuously increased. Because of SiO 2 The micro powder reacts with water to form hydration products, the hydration products are further polymerized, the molecular volume is increased, the laminar resistance of slurry is increased, the viscosity is overlarge, and the workability of the castable is affected. If SiO is 2 The effect is not obvious to a certain extent due to the excessively low content of the micro powder. Specifically, the content is 5wt%, 6 wt%, 7 wt%, 8wt%, or the like.
In some embodiments, the ingredients of the spray coating further comprise a second component comprising a binder and an additive; wherein the content of the binder is 0.05 to 0.1 parts by weight relative to 1 part by weight of the first component; the additive is contained in an amount of 0.005 to 0.01 parts by weight relative to 1 part by weight of the first component.
The content of the binder is 0.05 to 0.1 parts by weight for 1 part by weight of the first component, and the positive effects of this arrangement are: the high temperature performance and the acid resistance of the paint are obviously improved, and the air permeability of the paint is simultaneously considered. Specifically, the content of the binder may be 0.05 parts by weight, 0.06 parts by weight, 0.07 parts by weight, 0.08 parts by weight, 0.09 parts by weight, 0.1 parts by weight, or the like.
The additive is contained in an amount of 0.005 to 0.01 parts by weight relative to 1 part by weight of the first component, and the positive effects of this arrangement are: and the air permeability of the paint is improved. Specifically, the content of the binder may be 0.005 parts by weight, 0.006 parts by weight, 0.007 parts by weight, 0.008 parts by weight, 0.009 parts by weight, 0.01 parts by weight, or the like.
In some embodiments, the binding agent is solid hydrated alumina; wherein the particle diameter d of the solid hydrated alumina 50
≤3μm。
The solid hydrated alumina is selected to have the positive effects: compared with calcium aluminate cement, the hydrated alumina is a high-purity refractory binder, has extremely low CaO content, and can avoid the introduction of impurities as much as possible in the use process. In the acid-resistant spray paint, hydrated alumina is used as a binding agent, and high-temperature phases such as mullite and the like can be generated at high temperature, so that the high-temperature performance and acid-resistant performance of the acid-resistant spray paint are remarkably improved. Wherein Al is 2 O 3 The content of (2) is more than or equal to 98wt%.
Next, the particle diameter of the hydrated alumina particles used was d 50 The grain diameter of the fused mullite powder is less than or equal to 3 mu m and is far smaller than that of the fused mullite powder. Therefore, the hydrated alumina particles have the filling effect of micro powder, so that the gaps in the matrix are easy to fill, the spray coating is more compact, and the air permeability is reduced. At the same time, hydrate such as gibbsite and boehmite gel generated by the reaction of hydrated alumina and water easily blocks pores in the spray paint, and the air permeability is reduced. If the content of the bonding agent is too high, water vapor cannot be timely discharged to generate bursting phenomenon when the material is baked to a certain extent; if the content of the binder is too low, the binder may not function as an adhesive material to some extent and the effect of reducing air permeability may not be achieved. Specifically, the d 50 May be 3 μm, 2 μm, 2.5 μm, etc.
In addition, the air permeability of the spread after being dried is reduced. The air permeability of the water-containing unshaped refractory material after baking at 110 ℃ is generally larger than that after demolding, but the difference between the air permeability and the air permeability is reduced by adding hydrated alumina. This is because hydrated alumina is required to absorb a certain amount of water at the time of hydration, and this part of water exists in the hydrated product in the form of bound water, and is dehydrated and decomposed at 300 ℃ or higher, whereas the amount of water in the amorphous refractory is constant, and therefore, as the content of hydrated alumina increases, the bound water content in the cast body increases and the free water content decreases. During the demolding and drying stages, the evaporation of free water is a major factor in changing the air permeability, the more the free water evaporates, the more the air permeability increases. Thus, as the amount of hydrated alumina added increases, the free water content in the cast body is lower, so that the difference in air permeability between after demolding and after drying at 110 ℃ gradually decreases. However, the addition amount of the hydrated alumina cannot be too large, otherwise, when the material is baked, water vapor cannot be timely discharged, and a bursting phenomenon is generated.
In some embodiments, the additives are polypropylene pellets and FDN-CL; wherein,
the polypropylene pellets are contained in an amount of 0.0002 parts by weight to 0.0008 parts by weight relative to 1 part by weight of the first component;
the FDN-CL is contained in an amount of 0.002 parts by weight to 0.006 parts by weight relative to 1 part by weight of the first component.
The melting point of the polypropylene pellets is 130-160 ℃, the diameter is 1-3 mm, and FDN-CL is a retarding high-efficiency water reducer which takes sodium naphthalene sulfonate formaldehyde condensate as a main component and is compounded with various surface active substances.
The polypropylene pellets are selected to have the positive effects: the effect of separating aggregate is played in the spray coating construction, and after the construction is accomplished, begin to toast the bed of material, after toasting the temperature and surpassing 150 ℃, the ball melts gradually, leaves spherical cavity. In general, the castable matrix will crack due to thermal stress, and a gas permeation channel is formed after the crack penetrates. The spherical cavity can partially release thermal stress, alleviate crack growth and prevent the crack from developing into a through crack, thereby reducing air permeability.
The reason for separating the aggregate is: the refractory castable ventilation channels are mainly of two types: the first is the aggregate/matrix interface and the second is the pores and cracks in the matrix. The first type of ventilation channel is usually the primary ventilation channel, because the matrix particles of different sizes create filling defects around the aggregate, forming interface transition regions of higher porosity, which if allowed to communicate, become an effective way for fluid to quickly permeate. The parameter of the air permeability is called MPT (Maximum Paste Thickness), the number of interfaces between the aggregate and the matrix can be measured, the smaller the MPT value is, the smaller the interval between the aggregate particles is, the larger the ratio of the aggregate to the matrix is, the larger the number of interfaces between the aggregate and the matrix is, and the refractory castable has higher air permeability. In the conventional refractory castable, the aggregate content is generally 60 to 80%, and the spacing between adjacent aggregates is small, so that it is necessary to separate the aggregates in order to reduce the air permeability. However, if the aggregate particles are too far apart, the strength of the castable is seriously affected, and the separation distance must be controlled within a reasonable range.
The polypropylene pellets are contained in an amount of 0.0002 parts by weight to 0.0008 parts by weight relative to 1 part by weight of the first component, and are set so that the purpose thereof is: the effect of separating aggregate is played in the spray coating construction, and after the construction is accomplished, begin to toast the bed of material, after toasting the temperature and surpassing 150 ℃, the ball melts gradually, leaves spherical cavity. In general, the castable matrix will crack due to thermal stress, and a gas permeation channel is formed after the crack penetrates. The spherical cavity can partially release thermal stress, alleviate crack growth and prevent the crack from developing into a through crack, thereby reducing air permeability. The present examples establish through experimentation that this ratio can exert the greatest effect of the pellets. If the content of the polypropylene pellets is too high, too many spherical cavities can be caused to a certain extent, and the strength of the material is affected; if the content of the polypropylene pellets is too low, the effect of reducing the air permeability cannot be achieved to a certain extent. Specifically, the content of the polypropylene pellets may be 0.0002 parts by weight, 0.0004 parts by weight, 0.0006 parts by weight, 0.0008 parts by weight, or the like.
The FDN-CL is selected to have the positive effects: the water adding amount for the construction of the acid-resistant spray paint is reduced. The higher the water content of the material is, the higher the porosity and the higher the air permeability are after drying, so that the high-efficiency water reducing agent is adopted, and the water reducing agent molecules are gradually adsorbed on the surfaces of matrix particles due to polar or nonpolar groups, so that an electric double layer is formed on the surfaces of the matrix particles, and electrostatic repulsive force is generated between adjacent particles. The matrix particles are dispersed, the surface tension of the solid-liquid interface of the matrix particles is reduced, and the dispersibility of the slurry is improved, so that the water adding amount is reduced, and the air permeability is reduced.
And secondly, the low-air-permeability acid-resistant spray paint takes the hydrated alumina as a binding agent, and alumina gel generated by hydration of the hydrated alumina can fill pores in a casting body, so that the air permeability is low, meanwhile, the fluidity of slurry is fast attenuated, the construction time is short, a retarder is required to prolong the construction time, FDN-CL can form a complex with positive ions dissociated from the hydrated alumina, the crystallization precipitation of hydrate and reaction products is partially inhibited, or the growth of grains is inhibited, and the retarding effect is realized.
The content of the FDN-CL is 0.002 parts by weight to 0.006 parts by weight with respect to 1 part by weight of the first component, the object being set: the FDN-CL can form a complex with positive ions dissociated from the hydrated alumina, partially inhibit crystallization of hydrate and reaction products or inhibit grain growth, and play a role in retarding. Experiments prove that the weight ratio of the FDN-CL can play the maximum effect. If the content of the FDN-CL is too high, the FDN-CL can be caused to completely inhibit crystallization precipitation of hydrate and reaction products to a certain extent, and the effect of hydrated alumina is completely counteracted; if the content of FDN-CL is too low, the fluidity of the slurry is fast attenuated to a certain extent, and the construction time is too short to normally construct. Specifically, the content of the polypropylene pellets may be 0.002 parts by weight, 0.004 parts by weight, 0.006 parts by weight, or the like.
Based on a second aspect of the present general inventive concept, the present application provides a baking method of a spray paint for a dome of an iron-making hot blast stove, referring to fig. 1, the method includes:
s1, spraying the spray paint according to any embodiment of the first aspect on a designated position;
s2, under the condition of a first set heating rate, carrying out first heating on the spray paint at a designated position, and then carrying out first heat preservation;
s3, under the condition of a second set heating rate, carrying out second heating on the spray paint, and then carrying out second heat preservation; wherein,
the first set heating rate is 5-8 deg.C/h, and the second set heating rate is 8-10 deg.C/h.
The reason for the baking treatment is that: the spray coating of the embodiment of the application has low air permeability, and if the moisture is discharged too quickly in the baking hardening process, the spray coating bursts easily, so that the spray coating must be baked slowly at low temperature.
In the first stage, the temperature is raised to 150 ℃ from normal temperature, the temperature raising speed is 5-8 ℃/h, and the temperature is raised at a constant speed for 20-30h, so that the free water is discharged; the heat preservation time is 12h; if the temperature rising speed is too high, free water can be discharged too quickly to a certain extent, so that the material layer is at risk of cracking; if the temperature rise rate is too low, the slow-down construction time is caused to a certain extent, and the cost of a steel mill is increased. Specifically, the temperature rise rate may be 5 ℃/h, 6 ℃/h, 7 ℃/h, 8 ℃/h, or the like.
In the second stage, the temperature is raised from 150 ℃ to 350 ℃, the temperature raising speed is 8 ℃/h to 10 ℃/h, the temperature is raised for 20 to 25 hours, and the heat preservation time is 24 hours, so that the drainage of combined water, the melting of polypropylene pellets and the formation of spherical cavities are facilitated; if the temperature rise speed is too high, water vapor is discharged too quickly to a certain extent, so that cracks are generated in the construction body; if the temperature rise rate is too low, the slow-down construction time is caused to a certain extent, and the cost of a steel mill is increased. Specifically, the temperature rise rate may be 8 ℃/h, 9 ℃/h, 10 ℃/h, or the like.
The present application is further illustrated below in conjunction with specific examples. It should be understood that these examples are illustrative only of the present application and are not intended to limit the scope of the present application. The experimental procedures, which are not specified in the following examples, are generally determined according to national standards. If the corresponding national standard does not exist, the method is carried out according to the general international standard, the conventional condition or the condition recommended by the manufacturer.
The total weight percent of the first component in the examples herein is 100% and the second component is added based on the total weight of the first component.
TABLE 1 Components (wt%) of spray coating of examples 1-6 and comparative examples 1-2
TABLE 2 particle size (wt%) of spray coating compositions of examples 1-6
Table 3 construction process and performance of spray coating.
The spray paint prepared by the optimized design of the components of the spray paint in table 1 and the control of the granularity of the components of the spray paint in table 2 and by the reasonable construction process in table 3 has low air permeability, higher compressive strength and much higher than that of the comparative example.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. A spray coating for the spherical roof of an iron-making hot-blast stove is characterized in that the components of the spray coating comprise a first component and a second component,
the first component comprises electric melting mullite aggregate, electric melting mullite powder, kyanite, metal silicon powder and sintering aid; wherein,
the electric smelting mullite aggregate comprises 45-60 wt% of electric smelting mullite powder, 10-30 wt% of kyanite, 5-10 wt% of metal silicon powder, 1-5 wt% of sintering aid and 10-16 wt% of sintering aid;
the granularity of the electric melting mullite aggregate is 0.08mm-3mm; wherein,
the content of the electric melting mullite aggregate with the granularity of 1mm-3mm is 15-25 wt%;
the content of the electric melting mullite aggregate with the granularity of 0.08-1 mm is 30-40 wt%;
the granularity of the kyanite is 0.55mm-0.18mm, and the granularity of the metal silicon powder is less than or equal to 0.08mm;
the sintering aid comprises alpha-Al 2 O 3 Micropowder and SiO 2 Micro powder; wherein,
the alpha-Al 2 O 3 The granularity of the micro powder is less than or equal to 5 mu m, and the alpha-Al 2 O 3 The content of the micro powder is 5-8 wt%;
the SiO is 2 The granularity of the micro powder is less than or equal to 1 mu m, siO 2 The content of the micro powder is 5-8 wt%;
the second component comprises a binding agent and an additive; wherein,
the content of the binder is 0.05 to 0.1 parts by weight relative to 1 part by weight of the first component;
the content of the additive is 0.005 to 0.01 parts by weight relative to 1 part by weight of the first component;
the binding agent is solid hydrated alumina, and the particle size d of the solid hydrated alumina 50 ≤3μm；
The additives are polypropylene pellets and FDN-CL.
2. The spray coating according to claim 1, wherein the particle size of the fused mullite powder is less than or equal to 0.08mm.
3. The baking method of the spray paint for the spherical roof of the iron-making hot blast stove is characterized by comprising the following steps of:
spraying the spray coating according to any one of claims 1-2 at a designated location;
under the condition of a first set heating rate, carrying out first heating on the spray paint at a designated position, and then carrying out first heat preservation;
under the condition of a second set heating rate, carrying out second heating on the spray coating, and then carrying out second heat preservation; wherein,
the first set heating rate is 5-8 deg.C/h, and the second set heating rate is 8-10 deg.C/h.
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