CN114907132A - Mullite sintering machine grate bar and preparation method thereof - Google Patents
Mullite sintering machine grate bar and preparation method thereof Download PDFInfo
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- CN114907132A CN114907132A CN202110278861.6A CN202110278861A CN114907132A CN 114907132 A CN114907132 A CN 114907132A CN 202110278861 A CN202110278861 A CN 202110278861A CN 114907132 A CN114907132 A CN 114907132A
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- mullite
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- 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 title claims abstract description 58
- 229910052863 mullite Inorganic materials 0.000 title claims abstract description 58
- 238000005245 sintering Methods 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 27
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004927 clay Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002270 dispersing agent Substances 0.000 claims abstract description 7
- 239000007767 bonding agent Substances 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 15
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 4
- 229920001732 Lignosulfonate Polymers 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 4
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 4
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 4
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 4
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 4
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 4
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- 238000000748 compression moulding Methods 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 2
- 239000002699 waste material Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 2
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 239000002184 metal Substances 0.000 abstract description 4
- 239000007769 metal material Substances 0.000 abstract description 4
- 230000035939 shock Effects 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 239000011819 refractory material Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910001018 Cast iron Inorganic materials 0.000 description 4
- 229910001141 Ductile iron Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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- 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
- F27B21/02—Sintering grates or tables
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/30—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
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/447—Phosphates or phosphites, e.g. orthophosphate, hypophosphite
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
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Abstract
The invention discloses a mullite sintering machine grate bar and a preparation method thereof, belonging to the technical field of refractory materials. The mullite sintering machine grate bar comprises the following raw materials in percentage by mass: 85-90% of mullite, 2-8% of industrial alumina, 2-8% of clay powder, 1-3% of an organic bonding agent, 0.1-0.5% of a dispersing agent and 5-10% of added water. The sintering machine grate bar prepared by the invention has the mullite phase content of more than 90 percent, the apparent porosity of less than 19 percent and the volume density of more than 2.5g/cm 3 The refractoriness under load is more than 1650 ℃, and the normal temperature compressive strength is more than 100 MPa. The invention develops the grate bar of the sintering machine made of mullite, replaces metal material with the mullite, exerts the advantages of wear resistance, high strength, high temperature resistance, good thermal shock stability and no oxidation of the mullite material, is more suitable for the working condition of the sintering machine than the metal grate bar, and can prolong the service life of the grate bar to 9And 18 months.
Description
Technical Field
The invention belongs to the field of refractory materials, and particularly relates to a mullite sintering machine grate bar and a preparation method thereof.
Background
The sintering machine is sintering equipment used by iron and steel companies for preparing iron ore sintering materials for iron-making blast furnaces, and the basic component unit of the sintering machine is a sintering machine trolley, the bottom of the trolley uses a grid as a bottom structural member, and the grid and a panel at the end part of the trolley form a trolley charging space for containing iron ore powder mixture to be sintered. The iron ore powder mixture contains iron ore powder, lime, coal or coke, etc.
At present, the grate bars of the sintering machine are generally made of high-chromium cast iron, heat-resistant ductile iron and other metal materials, and cannot completely resist high-temperature impact generated by calcining an iron ore powder mixture at 800-plus-1200 ℃, and damage caused by erosion of various chemical substances, material abrasion, rapid cooling and heating, stress concentration and the like, and burning loss and breakage often occur, so that the grate bars have to be replaced often, the workload of a sintering section is increased, and the continuous operation of the sintering machine is influenced.
The grate bars are main consumption parts on a sintering machine trolley, the service life of the ductile iron grate bars is 4-8 months, and the longest service life of the ductile iron grate bars is 12 months after 6 months of high-chromium cast iron begins to be damaged, so that the consumption of the grate bars is very large. The grate bar has short service life, which leads to the increase of the production cost of the sintering ore and the reduction of the operation rate of the sintering machine, thus the problem to be solved urgently is to improve the service life of the grate bar.
Disclosure of Invention
The invention aims to provide a grate bar of a mullite sintering machine and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the mullite sintering machine grate comprises the following raw materials in percentage by mass: 85-90% of mullite, 2-8% of industrial alumina, 2-8% of clay powder, 1-3% of an organic bonding agent and 0.1-0.5% of a dispersing agent; 5-10% of additional water is added based on the total weight of the raw materials.
Further, the mullite grain size ratio is as follows in percentage by mass: 30 percent of granularity less than or equal to 180 meshes, 20 percent of granularity less than or equal to 80 meshes less than or equal to 180 meshes, 20 percent of granularity less than or equal to 40 meshes less than or equal to 80 meshes, and 30 percent of granularity less than or equal to 1mm less than or equal to 40 meshes.
Furthermore, the granularity of the industrial alumina is less than or equal to 180 meshes, and the content of the alumina is more than 95 wt%.
Further, the clay powder is raw clay powder, the content of alumina of the clay powder is 35-40wt%, and the granularity is less than or equal to 180 meshes.
Further, the organic binder is one or a mixture of more than two of pulp, pulp waste liquor, carboxymethyl cellulose, lignin and lignosulfonate in any proportion.
Further, the dispersing agent is one or a mixture of more than two of sodium tripolyphosphate, sodium hexametaphosphate, ethylene glycol, polyethylene glycol and polyvinyl alcohol in any proportion.
The preparation method of the mullite sintering machine grate bar comprises the following steps:
(1) mixing organic binder, dispersant and water uniformly in advance for later use;
(2) adding mullite with the granularity of more than 40 meshes and less than or equal to 1mm into a stirrer, adding the mixture obtained in the step (1), uniformly stirring, adding industrial alumina powder, clay powder and the rest of mullite material, and stirring for 5-30 minutes;
(3) and (3) pressing and forming: pressing and molding by a hydraulic press or a vibration pressing molding machine;
(4) drying the pressed and formed blank body at the temperature of 110-150 ℃ until the moisture content is less than or equal to 3%;
(5) roasting the mixture for 2 to 4 hours in a high temperature furnace at 1450 ℃ and 1500 ℃, cooling the mixture to room temperature along with the furnace, and discharging the mixture out of the furnace to obtain the catalyst.
Preferably, in the step (3), the pressure of the hydraulic machine is above 40 MPa; the pressure of the vibration and pressurization forming machine is more than 1MPa, the vibration frequency is 1000-2000 times/minute, and the amplitude is less than 5 mm.
The sintering machine trolley with the grate bars comprises a frame, wheels, end panels and grate bars.
The sintering machine with the trolley comprises the trolley, a trolley track, an igniter, a distributor, a driving device, a fan, a dust remover and the like.
The invention develops the sintering machine grate bar made of mullite, replaces metal material with mullite, exerts the advantages of high temperature resistance, chemical erosion resistance, wear resistance, high strength, good thermal shock stability and no oxidation of the mullite material, can be more suitable for the working condition of the sintering machine than the metal grate bar, can prolong the service life of the grate bar to 9-18 months, and can prolong the service life by at least 50 percent compared with high-chromium cast iron.
Drawings
FIG. 1 is an X-ray diffraction pattern of a mullite grate made in example 1;
FIG. 2 is a schematic structural diagram of the grate bar of the mullite sintering machine prepared by the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the drawings and examples, but the scope of the present invention is not limited thereto.
In the following examples, the mullite grain size ratio is as follows by mass percent: 30 percent of granularity which is less than or equal to 180 meshes, 20 percent of granularity which is less than 180 meshes and less than or equal to 80 meshes, 20 percent of granularity which is less than 80 meshes and less than or equal to 40 meshes, and 30 percent of granularity which is less than 40 meshes and less than or equal to 1 mm.
The granularity of the industrial alumina is less than or equal to 180 meshes, and the content of the alumina is more than 95 wt%.
The content of alumina in the raw clay powder is 35-40wt%, and the granularity is less than or equal to 180 meshes.
Example 1
The mullite sintering machine grate comprises the following raw materials in percentage by mass: 87.8 percent of mullite, 5 percent of industrial alumina, 5 percent of raw clay powder, 2 percent of carboxymethyl cellulose, 0.2 percent of sodium tripolyphosphate and 8 percent of added water by the total weight of the raw materials.
The preparation method of the mullite sintering machine grate bar comprises the following steps:
(1) uniformly mixing carboxymethyl cellulose, sodium tripolyphosphate and water in advance for later use;
(2) adding mullite with the granularity of more than 40 meshes and less than or equal to 1mm into a stirrer, adding the mixture obtained in the step (1), stirring for 5min to ensure that the liquid is dispersed and adhered to the surface of large particles, adding industrial alumina powder, clay powder and the rest of mullite material, and stirring for 10 min;
(3) and (3) compression molding: introducing the material in the step (2) into a grate bar forming die of a hydraulic press, and keeping the pressure of the hydraulic press at 42MPa for 5 seconds;
(4) drying the pressed and formed blank body at 110 ℃ until the moisture content is less than or equal to 3 percent;
(5) roasting at 1470 deg.C in high temperature furnace for 4 hr, cooling to room temperature, and discharging to obtain the final product with the structure shown in FIG. 2.
FIG. 1 is an X-ray diffraction pattern of the grate bar product, and the mullite phase content is more than 90% by analysis. The apparent porosity is 16 percent, and the volume density is 2.65g/cm 3 The refractoriness under load is 1690 ℃, and the normal-temperature compressive strength is 115 MPa. The grate bar has excellent high heat resistance, chemical corrosion resistance, thermal shock stability and wear resistance, so that the grate bar becomes a novel grate bar which is more excellent than a metal grate bar.
Example 2
A grate bar of a mullite sintering machine comprises the following raw materials in percentage by mass: 88 percent of mullite, 4.5 percent of industrial alumina, 5 percent of clay powder, 2 percent of paper pulp and 0.5 percent of glycol, and 5 percent of added water is calculated according to the total weight of the raw materials.
The preparation method of the mullite sintering machine grate bar comprises the following steps:
(1) mixing paper pulp, glycol and water uniformly in advance for later use;
(2) adding mullite with the particle size of more than 40 meshes and less than or equal to 1mm into a stirrer, adding the mixture obtained in the step (1), stirring for 5min to ensure that the liquid is dispersed and adhered to the surface of large particles, adding industrial alumina powder, clay powder and the rest of mullite material, and stirring for 15 min;
(3) and (3) pressing and forming: introducing the material obtained in the step (2) into a grate bar forming die of a vibration and pressurization forming machine, wherein the pressure of the vibration and pressurization forming machine is 1MPa, the vibration frequency is 2000 times/minute, the amplitude is less than 5mm, and the vibration time is 30 seconds;
(4) drying the pressed and formed blank body at 150 ℃ until the moisture content is less than or equal to 3 percent;
(5) roasting at 1450 deg.C for 3 hr, cooling to room temperature, and discharging to obtain grate bar with structure shown in FIG. 2.
The detection proves that the mullite phase content is more than 90 percent, the apparent porosity is 17.5 percent, and the volume density is 2.58 g/mlcm 3 The refractoriness under load is 1670 ℃, and the normal-temperature compressive strength is 108 MPa.
Example 3
The mullite sintering machine grate comprises the following raw materials in percentage by mass: 88.9 percent of mullite, 6 percent of industrial alumina, 2 percent of clay powder, 3 percent of lignin and 0.1 percent of sodium hexametaphosphate, and 10 percent of added water based on the total weight of the raw materials.
The preparation method of the mullite sintering machine grate bar comprises the following steps:
(1) uniformly mixing lignin, sodium hexametaphosphate and water in advance for later use;
(2) adding mullite with the granularity of more than 40 meshes and less than or equal to 1mm into a stirrer, adding the mixture obtained in the step (1), stirring for 10 minutes to ensure that liquid is dispersed and adhered to the surface of large particles, adding industrial alumina powder, clay powder and the rest of mullite material, and stirring for 15 minutes;
(3) and (3) pressing and forming: pressing and molding by using a hydraulic machine, wherein the pressure of the hydraulic machine is 45MPa, and keeping for 10 seconds;
(4) drying the pressed and formed blank body at 120 ℃ until the moisture content is less than or equal to 3 percent;
(5) roasting at 1460 deg.C in high temperature furnace for 3 hr, cooling to room temperature, and discharging to obtain the final product with the structure shown in FIG. 2.
The detection proves that the mullite phase content is more than 90 percent, the apparent porosity is 17 percent, and the volume density is 2.6g/cm 3 The refractoriness under load is 1680 ℃, and the normal-temperature compressive strength is 110 MPa.
In order to compare the influence of the grain size change of the mullite raw material on the grate bar performance, aiming at the example 1, the grain size ratio of the mullite raw material is adjusted as follows: the mass percentage is that the granularity is less than or equal to 180 meshes and is 20 percent, the granularity is more than 180 meshes and is less than or equal to 80 meshes and is 30 percent, the granularity is more than 80 meshes and is less than or equal to 40 meshes and is 30 percent, and the granularity is more than 40 meshes and is less than or equal to 1mm and is 20 percent. The other materials and the manufacturing process are unchanged, and the obtained grate bar has the following properties: the mullite phase content is more than 90 percent, the apparent porosity is 21 percent, and the volume density is 2.4g/cm 3 The refractoriness under load is 1600 ℃, and the normal-temperature compressive strength is 80 MPa.
A novel sintering pallet using the grate bar. The trolley consists of a frame, wheels, an end panel and grate bars. The trolley using the metal grate bars has high heat conductivity and poor heat resistance, so that heat insulation parts and a frame on the frame at the lower part of the grate bars are easily burnt out, the frame of the trolley is deformed, and the trolley is scrapped. Because the mullite grate bar has better heat resistance and heat insulation than the traditional grate bars made of metal materials such as high-chromium cast iron, heat-resistant ductile iron and the like, the frame of the trolley using the mullite grate bar is not easy to burn out, and the service life of the trolley is longer.
A sintering machine using the novel sintering pallet. The sintering machine comprises a trolley, a trolley track, an igniter, a distributor, a driving device, a fan, a dust remover and the like, and the service life of the novel sintering machine trolley is longer, so that the frequency of stopping maintenance and replacing the trolley of the sintering machine is reduced, the use cost is reduced, and the productivity utilization rate of the sintering machine is higher.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. The mullite sintering machine grate bar is characterized by comprising the following raw materials in percentage by mass: 85-90% of mullite, 2-8% of industrial alumina, 2-8% of clay powder, 1-3% of an organic bonding agent and 0.1-0.5% of a dispersing agent; 5-10% of additional water is added based on the total weight of the raw materials.
2. The grate bar for the mullite sintering machine as claimed in claim 1, wherein the mullite grain size ratio is as follows by mass percent: 30 percent of granularity less than or equal to 180 meshes, 20 percent of granularity less than or equal to 80 meshes less than or equal to 180 meshes, 20 percent of granularity less than or equal to 40 meshes less than or equal to 80 meshes, and 30 percent of granularity less than or equal to 1mm less than or equal to 40 meshes.
3. The grate bar for a mullite sintering machine according to claim 1, wherein the grain size of the industrial alumina is less than or equal to 180 meshes, and the alumina content is more than 95 wt%.
4. The grate bar for a mullite sintering machine as claimed in claim 1, wherein the clay powder is chamotte powder, the alumina content of the chamotte powder is 35-40wt%, and the grain size is less than or equal to 180 meshes.
5. The mullite sintering machine grate bar as claimed in claim 1, wherein the organic binder is one or a mixture of more than two of pulp, pulp waste liquor, carboxymethyl cellulose, lignin and lignosulfonate in any proportion.
6. The mullite sintering machine grate bar as claimed in claim 1, wherein the dispersing agent is one or a mixture of more than two of sodium tripolyphosphate, sodium hexametaphosphate, ethylene glycol, polyethylene glycol and polyvinyl alcohol in any proportion.
7. The method for preparing the grate bar of the mullite sintering machine according to any one of the claims 1 to 6, characterized by comprising the following steps:
(1) mixing organic binder, dispersant and water uniformly in advance for later use;
(2) adding mullite with the granularity of more than 40 meshes and less than or equal to 1mm into a stirrer, adding the mixture obtained in the step (1), uniformly stirring, adding industrial alumina powder, clay powder and the rest of mullite material, and stirring for 5-30 minutes;
(3) and (3) compression molding: pressing and molding by a hydraulic press or a vibration pressing molding machine;
(4) drying the pressed and formed blank body at the temperature of 110-150 ℃ until the moisture content is less than or equal to 3%;
(5) roasting at 1450-1500 ℃ for 2-4 hours in a high-temperature furnace, cooling to room temperature along with the furnace, and discharging to obtain the product.
8. The method for preparing the mullite sintering machine grate bar according to claim 7, wherein in the step (3), the pressure of a hydraulic machine is more than 40 MPa; the pressure of the vibration and pressurization forming machine is more than 1MPa, the vibration frequency is 1000 times/min and 2000 times/min, and the amplitude is less than 5 mm.
9. A pallet for a sintering machine, characterized by comprising the grate bar according to claim 1.
10. A sintering machine comprising the pallet according to claim 9.
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| FR1234568A (en) * | 1958-09-08 | 1960-10-18 | Ipsen Ceramics | Mullitic porcelain |
| CN1304902A (en) * | 2000-02-18 | 2001-07-25 | 沈智琪 | Technology for producing grate |
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