CN117287978A - Roasting section structure of belt roasting machine and preparation method thereof - Google Patents
Roasting section structure of belt roasting machine and preparation method thereof Download PDFInfo
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- CN117287978A CN117287978A CN202311171967.1A CN202311171967A CN117287978A CN 117287978 A CN117287978 A CN 117287978A CN 202311171967 A CN202311171967 A CN 202311171967A CN 117287978 A CN117287978 A CN 117287978A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000004321 preservation Methods 0.000 claims abstract description 12
- 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 description 71
- 229910052863 mullite Inorganic materials 0.000 claims description 71
- 239000000843 powder Substances 0.000 claims description 64
- 239000002245 particle Substances 0.000 claims description 46
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 42
- 238000002844 melting Methods 0.000 claims description 25
- 230000008018 melting Effects 0.000 claims description 25
- 229910052593 corundum Inorganic materials 0.000 claims description 24
- 239000000126 substance Substances 0.000 claims description 24
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 21
- 239000000377 silicon dioxide Substances 0.000 claims description 21
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 239000010431 corundum Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical compound O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 claims description 13
- 239000011449 brick Substances 0.000 claims description 13
- 229910052850 kyanite Inorganic materials 0.000 claims description 13
- 239000010443 kyanite Substances 0.000 claims description 13
- 235000012239 silicon dioxide Nutrition 0.000 claims description 13
- 238000009413 insulation Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 229920001709 polysilazane Polymers 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 8
- 239000011651 chromium Substances 0.000 claims description 8
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 229920006327 polystyrene foam Polymers 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- 239000003245 coal Substances 0.000 claims description 7
- 239000000919 ceramic Substances 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 6
- ZGUQGPFMMTZGBQ-UHFFFAOYSA-N [Al].[Al].[Zr] Chemical compound [Al].[Al].[Zr] ZGUQGPFMMTZGBQ-UHFFFAOYSA-N 0.000 claims description 4
- -1 aluminum zirconium silicon Chemical compound 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 15
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 13
- 229910052742 iron Inorganic materials 0.000 description 9
- 230000003628 erosive effect Effects 0.000 description 5
- 239000008188 pellet Substances 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 238000009415 formwork Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
-
- 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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
-
- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention provides a roasting section structure of a belt roasting machine and a preparation method thereof, wherein the roasting section structure comprises a heat preservation layer, a permanent layer and a working layer, the heat preservation layer is cast on the permanent layer, the working layer is cast into a prefabricated part, and is built on the permanent layer after being fired at a high temperature by a high-temperature tunnel kiln.
Description
Technical Field
The invention belongs to the technical field of belt roasting machines, and particularly relates to a roasting section structure of a belt roasting machine and a preparation method thereof.
Background
The current pig iron yield in China breaks through 10 hundred million tons. About 2.5 million tons of pellets are required, based on the total charge calculation. The annual production of pellets in China is 1.5 hundred million tons. The vast majority of the yield is produced by adopting the technology of a grate-rotary kiln and a shaft furnace, which is backward, low in efficiency, high in energy consumption, serious in pollution and low in product quality. Belt roasting machines are widely used in mining and steel enterprises. The method is characterized in that the whole process of pellet roasting, namely drying, preheating, roasting and cooling are completed on one device, and the method has the characteristics of simple technological process, compact arrangement, light tonnage of required device and the like, reduces the occupied area for factories, and reduces the engineering quantity. The popularization and application of the complete equipment of the belt roasting machine can realize that the large-scale pellet belt roasting machine in China is not dependent on foreign countries. The application of the belt roasting machine can promote the technical upgrading and structural adjustment of mining enterprises and steel enterprises, greatly reduce the construction investment and operation cost of the steel enterprises and improve the economic benefit of the enterprises.
The main working area of the belt type roasting machine is that the belt type roasting machine is in a preheating-roasting-soaking state, the roasting temperature is above 1300 ℃ from the roasting section, the wind speed is about 10m/s, the dust content of iron ore is high, the scouring and erosion to refractory materials are serious, most of the roasting section parts of the belt type roasting machine at present adopt a trapezoid structure as shown in the left and right of figure 1, and are integrally cast by mullite castable for supporting molds, and the structure and the material have three defects: 1. the mullite castable has poor heat insulation capability, so that the heat energy loss of a roasting section of the belt roasting machine is large; 2. the mullite castable has poor erosion resistance to iron ore dust, and influences the service life of the material; 3. the method of integral casting is convenient for later repair, but when the material structure is completely destroyed, the material structure needs to be completely removed and then the mould is re-supported for casting.
In the 'refractory brick for the combustion chamber of the belt roasting machine and the preparation method thereof' (CN 202010319799.6), special-grade bauxite, white corundum, sub-white corundum fine powder, kyanite fine powder, binding agent and the like are adopted as raw materials to solve the problems of poor thermal shock stability and poor wear resistance of refractory materials of the combustion chamber of the belt roasting machine. However, in the technical scheme of the patent, the raw material cost is high, the capability of resisting the corrosion of the iron-containing component of the pellet ore is insufficient, the preparation process is complex, the firing time is long, and the energy consumption is high.
The 'ash adhesion resistant and wear resistant castable for garbage incinerator' (CN 201910310636.9) patent proposes that corundum, silicon carbide, alumina micropowder, silicon dioxide micropowder and silicon nitride are used as raw materials, sodium hexametaphosphate, sodium lignin sulfonate and the like are used as binding agents to improve the wear resistance of the ash adhesion resistant castable. But has higher raw material cost, poorer oxidation resistance, poor bonding performance and poorer sintering performance.
In the 'corundum-mullite castable and the preparation method thereof' (CN202111488657.3.8), aluminum, silicon and carbon black are mixed, triethanolamine is added for ball milling, then ethanol solution and mullite hollow spheres are added for treatment to obtain modified mullite hollow spheres, and silica sol doped with modified nano barium sulfate is used for preparing the mullite castable, so that the mullite castable has lower heat conductivity, higher strength and better thermal shock resistance. But cannot resist the scouring and erosion of the iron powder.
Disclosure of Invention
The invention aims to solve the technical problems and provides a roasting section structure of a belt roasting machine and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: the roasting section structure of the belt roasting machine is characterized by comprising an insulation layer, a permanent layer and a working layer, wherein the insulation layer is poured at the outer side end of the permanent layer, and the working layer is a pouring prefabricated member and is arranged at the inner side end of the permanent layer.
According to the scheme, the inner side end and the outer side end of the permanent layer are respectively provided with the step parts, and the working layer and the heat preservation layer are respectively arranged on the step parts at the inner side end and the outer side end of the permanent layer.
According to the scheme, the top surface of the working layer is a lower inclined surface, and the inclined surface included angle is 30-45 degrees.
The preparation method of the roasting section structure of the belt roasting machine is characterized by comprising the following steps:
step one, preparing a permanent layer:
the brick is built by adopting sintered aluminum zirconium silica bricks through mullite slurry;
step two, preparing an insulating layer:
according to electric smelting mullite fine powder, coal powder and alpha-Al 2 O 3 The mass ratio of the micro powder to the silicon dioxide micro powder is 100: 5-8: 30-35: 17 to 27, adding the mixture into a stirrer, and mixing and stirring the mixture for 7 to 10 minutes to obtain premixed fine powder; according to the mass ratio of the mullite hollow sphere particles, the polystyrene foam spheres and the premixed fine powder material of 100:4 to 7: 51-58 are added into a stirrer to be mixed and stirred for 8-12 minutes to obtain premix; adding water accounting for 8-12 wt% of the premix into the premix, and stirring for 5-7 minutes to obtain a castable for the heat preservation layer of the roasting section of the belt roasting machine, wherein the castable is directly poured on the step part at the outer side end of the permanent layer;
step three, preparing a working layer:
electric melting mullite aggregate: 40-50 parts of chrome corundum aggregate: 10 to 15 parts of alpha-Al 2 O 3 Micro powder: 5-10 parts of chromium green: 1-3 parts of kyanite: 3-5 parts of electric melting mullite fine powder: 27-29 parts of alpha-Al 2 O 3 Adding the micro powder, chrome green and electric melting mullite fine powder into a planetary mixer to mix for 5-7 minutes to obtain premixed fine powder, and then adding the electric melting mullite aggregate, chrome corundum aggregate, kyanite and the premixed fine powder into the planetary mixer to mix for 8-10 minutes to obtain premix; finally, adding liquid organic polysilazane accounting for 7-9 wt% of the premix into the premix, stirring for 5-8 minutes, pressing into a designed shape by adopting a semi-dry method after stirring, and calcining in a tunnel kiln to obtain a working layer; uniformly coating mullite slurry on the step part of the permanent layer, which is contacted with the working layer, and then placing the working layer on the permanent layer to finish the preparation.
According to the scheme, the density of the sintered aluminum-zirconium-silicon brick is 4.05-4.25 g/cm 3 The chemical components comprise：Al 2 O 3 The content is 45-48 wt percent, siO 2 The content is 10 to 13 weight percent, zrO 2 The content is 39-41 wt%.
According to the scheme, the granularity of the fused mullite fine powder is less than or equal to 0.076mm, and the chemical components comprise: al (Al) 2 O 3 The content is 68.78 to 73.32 weight percent, siO 2 22.51 to 25.71wt percent of Fe 2 O 3 The content is less than 0.95wt%; the mullite hollow sphere particles comprise a plurality of particle sizes: 24-36 wt% of particle size 5-8 mm, 20-24 wt% of particle size 3-5 mm, 23-27 wt% of particle size 1-3 mm, and 14-18 wt% of particle size 0.076-1 mm; the mullite hollow sphere comprises the following chemical components: al (Al) 2 O 3 The content is 58.66 to 63.12 weight percent, siO 2 The content is 32.73 to 35.46 weight percent, fe 2 O 3 The content is less than 1.03wt%; the density of the mullite hollow sphere is 1.76-1.83 g/cm 3 。
According to the scheme, the granularity of the pulverized coal is less than or equal to 200 mu m, and the content of C is more than or equal to 99wt%; the alpha-Al 2 O 3 The granularity of the micro powder is less than or equal to 0.044mm, al 2 O 3 The content is more than or equal to 98wt percent; the granularity of the silica micropowder is 101 nm-300 nm, and the content of SiO2 is more than or equal to 99.90wt%; the granularity of the polystyrene foam ball is 0.5 mm-10 mm, and the density is less than or equal to 0.99g/cm 3 。
According to the scheme, the electric melting mullite aggregate comprises a plurality of particle sizes: the electric melting mullite aggregate comprises the following chemical components of 21-33wt% of 5-8 mm in particle size, 19-23wt% of 3-5 mm in particle size, 28-32wt% of 1-3 mm in particle size and 13-17wt% of 0.076-1 mm in particle size: al (Al) 2 O 3 The content is 68.78 to 73.32 weight percent, siO 2 22.51 to 25.71wt percent of Fe 2 O 3 The content is less than 0.95wt%; the density of the electric melting mullite aggregate is 2.75-2.81 g/cm 3 。
According to the scheme, the granularity of the chrome corundum aggregate is 0.076-1 mm, and the chemical components comprise: al (Al) 2 O 3 The content is 84.15 to 86.12 weight percent, cr 2 O 3 The content is 13.29 to 14.35 weight percent; the granularity of the chromium green is less than or equal to 45 mu m, cr 2 O 3 The content is more than or equal to 99wt percent; particle size of the kyanite fine powderIs 60-80 mu m, and the density is 3.50-3.58 g/cm 3 The chemical components comprise: al (Al) 2 O 3 The content is 60-62 wt percent, siO 2 The content is 35-36 wt%.
According to the scheme, the density of the liquid organic polysilazane is 0.98-1.11 g/cm 3 The molecular weight is 900-1000 g/mol, and the ceramic yield at 800 ℃ is more than or equal to 80wt%.
The beneficial effects of the invention are as follows: the structure of the roasting section of the belt roasting machine and the preparation method thereof are provided, the structure of the whole formwork casting of mullite castable is adopted in the roasting section of the traditional belt roasting machine, the structure of the heat insulation layer, the permanent layer and the working layer is changed, the heat loss of the roasting section is reduced by arranging the heat insulation layer, the energy loss is reduced, and the heat insulation layer is directly cast on the working layer, so that the link of formwork erection and formwork removal is omitted; the working layer is directly placed on the permanent layer after being pressed and calcined by a semi-dry method, the service life of the rear working layer can be directly taken down for replacement after the service life of the rear working layer is up, and meanwhile, the chromium corundum and the chromium green powder are introduced into the working layer to improve the capability of the working layer material for resisting iron dust erosion, so that the service life of the material can be greatly prolonged; the working layer of the roasting section of the belt roasting machine adopts liquid organic polysilazane as a binding agent, and the high-temperature performance and the wear resistance of the material are improved through the combination of ceramics.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiments of the present patent are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present patent and are not to be construed as limiting the present patent.
As shown in fig. 1, the roasting section structure of the belt roasting machine comprises an insulation layer 1, a permanent layer 2 and a working layer 3, wherein the insulation layer is poured at the outer side end of the permanent layer, and the working layer is a pouring prefabricated member and is arranged at the inner side end of the permanent layer.
The inner side end and the outer side end of the permanent layer are respectively provided with a step part, and the working layer and the heat preservation layer are respectively arranged on the step parts of the inner side end and the outer side end of the permanent layer. The heat loss of the roasting section is reduced by arranging the heat insulation layer, so that the energy loss is reduced; the heat preservation layer is directly poured on the working layer, so that a link of formwork supporting and removing is omitted; after the service life of the working layer is up, the working layer can be directly taken down for replacement.
The top surface of the working layer is a lower inclined surface, and the inclined surface included angle is 30-45 degrees.
The preparation method of the roasting section structure of the belt roasting machine comprises the following steps:
step one, preparing a permanent layer:
the brick is built by adopting sintered aluminum zirconium silica bricks through mullite slurry; the density of the sintered aluminum-zirconium-silicon brick is 4.05-4.25 g/cm 3 The chemical components comprise: al (Al) 2 O 3 The content is 45-48 wt percent, siO 2 The content is 10 to 13 weight percent, zrO 2 The content is 39-41 wt%.
Step two, preparing an insulating layer:
according to electric smelting mullite fine powder, coal powder and alpha-Al 2 O 3 The mass ratio of the micro powder to the silicon dioxide micro powder is 100:
(5-8): (30-35): (17-27), adding the mixture into a stirrer, and mixing and stirring the mixture for 7-10 minutes to obtain premixed fine powder; according to the mass ratio of the mullite hollow sphere particles, the polystyrene foam spheres and the premixed fine powder material of 100: (4-7): (51-58) adding the mixture into a stirrer, and mixing and stirring the mixture for 8-12 minutes to obtain a premix; adding water accounting for 8-12 wt% of the premix into the premix, and stirring for 5-7 minutes to obtain a castable for the heat preservation layer of the roasting section of the belt roasting machine, wherein the castable is directly poured on the step part at the outer side end of the permanent layer;
the granularity of the fused mullite fine powder is less than or equal to 0.076mm, and the chemical components comprise: al (Al) 2 O 3 The content is 68.78 to 73.32 weight percent, siO 2 22.51 to 25.71wt percent of Fe 2 O 3 The content is less than 0.95wt%; the mullite hollow sphere particles comprise a plurality of particle sizes: 24-36 wt% of particle size 5-8 mm, 20-24 wt% of particle size 3-5 mm, 23-27 wt% of particle size 1-3 mm, and 14-18 wt% of particle size 0.076-1 mm; the mullite hollow sphere comprises the following chemical components: al (Al) 2 O 3 The content is 58.66 to 63.12 weight percent, siO 2 The content is 32.73 to 35.46 weight percent, fe 2 O 3 The content is less than 1.03wt%; the density of the mullite hollow sphere is 1.76-1.83 g/cm 3 。
The granularity of the pulverized coal is less than or equal to 200 mu m, and the content of C is more than or equal to 99wt%; alpha-Al 2 O 3 The granularity of the micro powder is less than or equal to 0.044mm, al 2 O 3 Content of
More than or equal to 98 weight percent; the granularity of the silica micropowder is 101 nm-300 nm, and the content of SiO2 is more than or equal to 99.90wt%; polystyrene foam ball granularity is 0.5 mm-10 mm, density is less than or equal to 0.99g/cm 3 。
Step three, preparing a working layer:
electric melting mullite aggregate: 40-50 parts of chrome corundum aggregate: 10-15 parts of alpha-Al 2O3 micro powder: 5-10 parts of chromium green: 1-3 parts of kyanite: 3 to 5 portions of electric smelting mullite fine powder 27 to 29 portions, firstly mixing alpha-Al 2 O 3 Adding the micro powder, chrome green and electric melting mullite fine powder into a planetary mixer to mix for 5-7 minutes to obtain premixed fine powder, and then adding the electric melting mullite aggregate, chrome corundum aggregate, kyanite and the premixed fine powder into the planetary mixer to mix for 8-10 minutes to obtain premix; finally, adding liquid organic polysilazane accounting for 7-9 wt% of the premix into the premix, stirring for 5-8 minutes, pressing into a designed shape by adopting a semi-dry method after stirring, and calcining in a tunnel kiln to obtain a working layer; uniformly coating mullite slurry on the step part of the permanent layer, which is contacted with the working layer, and then placing the working layer on the permanent layer to finish the preparation.
The fused mullite aggregate comprises a plurality of grain sizes: the grain diameter is 5-8 mm and the content is 21-33 wt%The electric melting mullite aggregate comprises the following chemical components of, by weight, 19-23% of the electric melting mullite aggregate with the particle size of 3-5 mm, 28-32% of the electric melting mullite aggregate with the particle size of 1-3 mm and 13-17% of the electric melting mullite aggregate with the particle size of 0.076-1 mm: al (Al) 2 O 3 The content is 68.78 to 73.32 weight percent, siO 2 22.51 to 25.71wt percent of Fe 2 O 3 The content is less than 0.95wt%; the density of the electric melting mullite aggregate is 2.75-2.81 g/cm 3 。
The granularity of the chrome corundum aggregate is 0.076-1 mm, and the chemical components comprise: al (Al) 2 O 3 The content is 84.15 to 86.12 weight percent, cr 2 O 3 The content is 13.29 to 14.35 weight percent; the granularity of chrome green is less than or equal to 45 mu m, cr 2 O 3 The content is more than or equal to 99wt percent; the granularity of the fine powder of the kyanite is 60-80 mu m, and the density is 3.50-3.58 g/cm 3 The chemical components comprise: al (Al) 2 O 3 The content is 60-62 wt percent, siO 2 The content is 35-36 wt%. The introduction of chrome corundum and chrome green powder into the working layer improves the capability of the working layer material for resisting iron dust erosion, and can greatly improve the service life of the material.
The density of the liquid organic polysilazane is 0.98-1.11 g/cm 3 The molecular weight is 900-1000 g/mol, and the ceramic yield at 800 ℃ is more than or equal to 80wt%. The working layer adopts liquid organic polysilazane as a bonding agent, and the high-temperature performance and the wear resistance of the material are improved through the combination of ceramics.
Example 1
The roasting section structure of the belt roasting machine comprises a heat preservation layer, a permanent layer and a working layer. The heat preservation layer is cast on the permanent layer, the working layer is cast into a prefabricated member, and the prefabricated member is placed on the permanent layer after high-temperature firing in a high-temperature tunnel kiln is completed. The top surface of the working layer is an inclined surface, and the inclined surface included angle is 35 degrees.
The preparation method of the heat preservation layer comprises the following specific steps: according to electric smelting mullite fine powder, coal powder and alpha-Al 2 O 3 The mass ratio of the micro powder to the silicon dioxide micro powder is 100:8:33:25, adding the mixture into a stirrer, mixing and stirring for 10 minutes to obtain premixed fine powder; according to the mass ratio of the mullite hollow sphere particles, the polystyrene foam spheres and the premixed fine powder material of 100:6:55, adding the mixture into a stirrer, mixing and stirring for 12 minutes to obtain a premix; to the houseAdding water accounting for 11wt% of the premix into the premix, and stirring for 6 minutes to obtain the castable for the heat preservation layer of the roasting section of the belt roasting machine, and directly casting the castable on the permanent layer.
The preparation method of the permanent layer comprises the following specific steps: the brick is built by adopting sintered aluminum zirconium silica bricks through mullite slurry.
The preparation method of the working layer comprises the following specific steps: electric melting mullite aggregate: 50 parts of chrome corundum aggregate: 10 parts of alpha-Al 2 O 3 Micro powder: 5 parts of chromium green: 3 parts of kyanite: 3 parts of electric melting mullite powder 29 parts, firstly mixing alpha-Al 2 O 3 Adding the micro powder, chrome green and electric melting mullite fine powder into a planetary mixer for mixing for 7 minutes to obtain premixed fine powder, and then adding the electric melting mullite aggregate, chrome corundum aggregate, kyanite and the premixed fine powder into the planetary mixer for mixing for 10 minutes to obtain premix; and finally, adding liquid organic polysilazane accounting for 9wt% of the premix into the premix, stirring for 8 minutes, pressing into a designed shape by adopting a semi-dry method after stirring, and calcining by a tunnel kiln to obtain the working layer. The mullite slurry is uniformly coated on the vertical surface and the horizontal surface of the permanent layer, which are in contact with the working layer, and then the working layer is placed on the permanent layer.
The granularity of the electric melting mullite fine powder is less than or equal to 0.076mm, and the main chemical components of the electric melting mullite fine powder are as follows: al (Al) 2 O 3 The content is 68.78 to 73.32 weight percent, siO 2 22.51 to 25.71wt percent of Fe 2 O 3 The content is less than 0.95wt%. The mullite hollow sphere particles comprise: 24-36 wt% of particle size 5-8 mm, 20-24 wt% of particle size 3-5 mm, 23-27 wt% of particle size 1-3 mm, and 14-18 wt% of particle size 0.076-1 mm; the main chemical components of the mullite hollow sphere are as follows: al (Al) 2 O 3 The content is 58.66 to 63.12 weight percent, siO 2 The content is 32.73 to 35.46 weight percent, fe 2 O 3 The content is less than 1.03wt%; the density of the mullite hollow sphere is 1.76-1.83 g/cm 3 。
α-Al 2 O 3 The granularity of the micro powder is less than or equal to 0.044mm; alpha-Al 2 O 3 Al of micropowder 2 O 3 The content is more than or equal to 98 weight percent. Particle size of pulverized coalLess than or equal to 200 mu m, and the content of C is more than or equal to 99 weight percent. The granularity of the silicon dioxide micro powder is 101 nm-300 nm, siO 2 The content is more than or equal to 99.90wt%. Polystyrene foam ball granularity is 0.5 mm-10 mm, density is less than or equal to 0.99g/cm 3 。
The electrically fused mullite aggregate comprises: 21-33wt% of particle size 5-8 mm, 19-23wt% of particle size 3-5 mm, 28-32wt% of particle size 1-3 mm, and 13-17wt% of particle size 0.076-1 mm, and the main chemical components comprise: al (Al) 2 O 3 The content is 68.78 to 73.32 weight percent, siO 2 22.51 to 25.71wt percent of Fe 2 O 3 The content is less than 0.95wt%; the density of the electric melting mullite aggregate is 2.75-2.81 g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The granularity of the chrome corundum aggregate is 0.076-1 mm, and the main chemical components comprise: al (Al) 2 O 3 The content is 84.15 to 86.12 weight percent, cr 2 O 3 The content is 13.29 to 14.35 weight percent.
The granularity of chrome green is less than or equal to 45 mu m, cr 2 O 3 The content is more than or equal to 99 weight percent. The granularity of the fine powder of the kyanite is 60-80 mu m, and the density is 3.50-3.58 g/cm 3 The chemical components comprise: al (Al) 2 O 3 The content is 60-62 wt percent, siO 2 The content is 35-36 wt%.
The density of the liquid organic polysilazane is 0.98-1.11 g/cm 3 The molecular weight is 900-1000 g/mol, and the ceramic yield at 800 ℃ is more than or equal to 80wt%.
The density of the sintered aluminum-zirconium-silicon brick is 4.05-4.25 g/cm 3 The chemical components comprise: al (Al) 2 O 3 The content is 45-48 wt percent, siO 2 The content is 10 to 13 weight percent, zrO 2 The content is 39-41 wt%.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The roasting section structure of the belt roasting machine is characterized by comprising an insulation layer, a permanent layer and a working layer, wherein the insulation layer is poured at the outer side end of the permanent layer, and the working layer is a pouring prefabricated member and is arranged at the inner side end of the permanent layer.
2. The structure of the roasting section of the belt roasting machine according to claim 1, wherein the inner and outer side ends of the permanent layer are respectively provided with a step portion, and the working layer and the heat-insulating layer are respectively arranged on the step portions of the inner and outer side ends of the permanent layer.
3. The firing section structure of a belt firing machine according to claim 1 or 2, wherein the top surface of the working layer is a lower inclined surface, and the inclined surface has an included angle of 30 ° to 45 °.
4. The preparation method of the roasting section structure of the belt roasting machine is characterized by comprising the following steps:
step one, preparing a permanent layer:
the brick is built by adopting sintered aluminum zirconium silica bricks through mullite slurry;
step two, preparing an insulating layer:
the mass ratio of the fused mullite powder to the pulverized coal to the alpha-Al 2O3 powder to the silica powder is 100:
5-8: 30-35: 17 to 27, adding the mixture into a stirrer, and mixing and stirring the mixture for 7 to 10 minutes to obtain premixed fine powder; according to the mass ratio of the mullite hollow sphere particles, the polystyrene foam spheres and the premixed fine powder material of 100:4 to 7: 51-58 are added into a stirrer to be mixed and stirred for 8-12 minutes to obtain premix; adding water accounting for 8-12 wt% of the premix into the premix, and stirring for 5-7 minutes to obtain a castable for the heat preservation layer of the roasting section of the belt roasting machine, wherein the castable is directly poured on the step part at the outer side end of the permanent layer;
step three, preparing a working layer:
electric melting mullite aggregate: 40-50 parts of chrome corundum aggregate: 10-15 parts of alpha-Al 2O3 micro powder: 5-10 parts of chromium green: 1-3 parts of kyanite: 3-5 parts of electric melting mullite fine powder: 27-29 parts of alpha-Al 2O3 micro powder, chrome green and fused mullite fine powder are added into a planetary mixer to be mixed for 5-7 minutes to obtain premixed fine powder, and then fused mullite aggregate, chrome corundum aggregate, kyanite and the premixed fine powder are added into the planetary mixer to be mixed for 8-10 minutes to obtain premix; finally, adding liquid organic polysilazane accounting for 7-9 wt% of the premix into the premix, stirring for 5-8 minutes, pressing into a designed shape by adopting a semi-dry method after stirring, and calcining in a tunnel kiln to obtain a working layer; uniformly coating mullite slurry on the step part of the permanent layer, which is contacted with the working layer, and then placing the working layer on the permanent layer to finish the preparation.
5. The method for manufacturing a firing zone structure of a belt firing machine according to claim 4, wherein the sintered aluminum zirconium silicon brick has a density of 4.05 to 4.25g/cm3, and the chemical composition comprises: 45-48 wt% of Al2O3, 10-13 wt% of SiO2 and 39-41 wt% of ZrO 2.
6. The structure of the roasting section of the belt roasting machine according to claim 4 or 5, wherein the granularity of the fused mullite fine powder is less than or equal to 0.076mm, and the chemical components comprise: the content of Al2O3 is 68.78 to 73.32wt percent, the content of SiO2 is 22.51 to 25.71wt percent, and the content of Fe2O3 is less than 0.95wt percent; the mullite hollow sphere particles comprise a plurality of particle sizes: 24-36 wt% of particle size 5-8 mm, 20-24 wt% of particle size 3-5 mm, 23-27 wt% of particle size 1-3 mm, and 14-18 wt% of particle size 0.076-1 mm; the mullite hollow sphere comprises the following chemical components: the content of Al2O3 is 58.66 to 63.12 weight percent, the content of SiO2 is 32.73 to 35.46 weight percent, and the content of Fe2O3 is less than 1.03 weight percent; the density of the mullite hollow sphere is 1.76-1.83 g/cm < 3 >.
7. The structure of a roasting section of a belt roasting machine according to claim 6, wherein the granularity of the pulverized coal is less than or equal to 200 μm, and the content of C is more than or equal to 99wt%; the granularity of the alpha-Al 2O3 micro powder is less than or equal to 0.044mm, and the content of Al2O3 is more than or equal to 98wt%; the granularity of the silica micropowder is 101 nm-300 nm, and the content of SiO2 is more than or equal to 99.90wt%; the granularity of the polystyrene foam balls is 0.5 mm-10 mm, and the density is less than or equal to 0.99g/cm < 3 >.
8. The belt calciner segment structure of claim 4 or 7, wherein the electrically fused mullite aggregate comprises a plurality of grain sizes: the electric melting mullite aggregate comprises the following chemical components of 21-33wt% of 5-8 mm in particle size, 19-23wt% of 3-5 mm in particle size, 28-32wt% of 1-3 mm in particle size and 13-17wt% of 0.076-1 mm in particle size: the content of Al2O3 is 68.78 to 73.32wt%, the content of SiO2 is 22.51 to 25.71wt%, and the content of Fe2O3 is less than 0.95wt%; the density of the electrofused mullite aggregate is 2.75-2.81 g/cm < 3 >.
9. The belt roasting machine roasting section structure of claim 6, wherein the chrome corundum aggregate has a particle size of 0.076-1 mm, and the chemical components include: the content of Al2O3 is 84.15-86.12 wt%, and the content of Cr2O3 is 13.29-14.35 wt%; the granularity of the chromium green is less than or equal to 45 mu m, and the content of Cr2O3 is more than or equal to 99wt%; the granularity of the kyanite fine powder is 60-80 mu m, the density is 3.50-3.58 g/cm < 3 >, and the chemical components comprise: the content of Al2O3 is 60-62 wt% and the content of SiO2 is 35-36 wt%.
10. The belt calciner segment structure of claim 9, wherein the liquid organic polysilazane has a density of 0.98-1.11 g/cm3, a molecular weight of 900-1000 g/mol, and a ceramic yield of 800 ℃ of greater than or equal to 80wt%.
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