CN116177998A - Regenerated low-carbon corundum spinel impact plate and preparation method thereof - Google Patents
Regenerated low-carbon corundum spinel impact plate and preparation method thereof Download PDFInfo
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- CN116177998A CN116177998A CN202310199259.2A CN202310199259A CN116177998A CN 116177998 A CN116177998 A CN 116177998A CN 202310199259 A CN202310199259 A CN 202310199259A CN 116177998 A CN116177998 A CN 116177998A
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- 229910052593 corundum Inorganic materials 0.000 title claims abstract description 61
- 239000010431 corundum Substances 0.000 title claims abstract description 61
- 229910052596 spinel Inorganic materials 0.000 title claims abstract description 57
- 239000011029 spinel Substances 0.000 title claims abstract description 57
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title abstract description 11
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000000843 powder Substances 0.000 claims abstract description 41
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 34
- 239000002699 waste material Substances 0.000 claims abstract description 27
- 239000002131 composite material Substances 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000011230 binding agent Substances 0.000 claims abstract description 15
- 239000000654 additive Substances 0.000 claims abstract description 4
- 230000000996 additive effect Effects 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 238000012216 screening Methods 0.000 claims description 9
- 239000011265 semifinished product Substances 0.000 claims description 9
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 229920001131 Pulp (paper) Polymers 0.000 claims description 5
- 239000012267 brine Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 5
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000012856 weighed raw material Substances 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 230000001172 regenerating effect Effects 0.000 claims 8
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000008929 regeneration Effects 0.000 abstract description 2
- 238000011069 regeneration method Methods 0.000 abstract description 2
- 239000011449 brick Substances 0.000 description 8
- 230000035939 shock Effects 0.000 description 8
- 238000010304 firing Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000007767 bonding agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 235000014380 magnesium carbonate Nutrition 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000036632 reaction speed Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000007885 magnetic separation Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
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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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- 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
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
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- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a regenerated low-carbon corundum spinel impact plate and a preparation method thereof. The regenerated low-carbon corundum spinel impact plate comprises: the regenerated low-carbon corundum spinel impact plate is formed by processing the following raw materials: brown corundum: 20-60%; white corundum particles + white corundum particle fine powder: 15-25%; fused magnesia particles + fused magnesia fines: 1 to 5 percent; active composite spinel micropowder: 15-25%; additive: 0.5 to 2 percent; and (2) a binding agent: 2 to 6 percent. The regenerated low-carbon corundum spinel impact plate and the preparation method thereof provided by the invention have the advantages that the service life of the impact plate can be greatly prolonged, and simultaneously, the problems of resource waste and environmental pollution can be reduced by extracting brown corundum from waste castable as a raw material for regeneration.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a regenerated low-carbon corundum spinel impact plate and a preparation method thereof.
Background
The low-carbon corundum spinel impact plate for the tundish is mainly used at the impact area of casting steel when the tundish is cast in a steel plant, and can resist the impact of molten steel and wash out in the tundish to protect the impact area.
At present, 3 kinds of tundish impact plates commonly adopted in the steel industry are magnesia carbon bricks, aluminum magnesia carbon bricks and carbonless precast blocks, the factors of long service life, low cost performance and low production cycle of the carbonless precast blocks are not used in a large amount, when molten steel is poured into magnesia carbon bricks and aluminum magnesia carbon bricks, the cast bricks are relatively large in corrosion loss, the cast bricks are particularly unsuitable for smelting excellent steel varieties due to relatively high carbon content, and the produced waste corundum-spinel castable is mostly abandoned for a long time, only a small part of cast bricks are processed into particles with various grain diameters according to the use requirements after simple sorting and crushing treatment, and when low-grade refractory products with the same materials are produced, the process is as follows: the used waste castable resources, sorting, crushing, primary magnetic separation, specification materials and doping into new products with low-grade quality, and the specification raw materials obtained after the preliminary processing are mainly used as raw materials of unshaped refractory material products, but the raw materials are not finished by simple crushing processing, so that the doping amount and the using range of the specification materials are greatly limited, the product performance is poor, and as a result, the recycling rate of the used waste corundum-spinel castable is low, a great amount of resource waste is caused, and the environmental sanitation of society is destroyed.
Therefore, it is necessary to provide a new regenerated low-carbon corundum spinel impact plate and a preparation method thereof to solve the above technical problems.
Disclosure of Invention
The invention solves the technical problem of providing the regenerated low-carbon corundum spinel impact plate which can greatly prolong the service life of the impact plate, and simultaneously can reduce the problems of resource waste and environmental pollution by extracting brown corundum from waste castable as a raw material for regeneration and use and a preparation method thereof.
In order to solve the technical problems, the regenerated low-carbon corundum spinel impact plate provided by the invention comprises: the regenerated low-carbon corundum spinel impact plate is formed by processing the following raw materials:
brown corundum: 20-60%;
white corundum particles + white corundum particle fine powder: 15-25%;
fused magnesia particles + fused magnesia fines: 1 to 5 percent;
active composite spinel micropowder: 15-25%;
additive: 0.5 to 2 percent;
and (2) a binding agent: 2 to 6 percent.
As a further scheme of the invention, the brown fused alumina is regenerated and extracted from waste corundum-spinel castable, and the extraction steps are as follows:
(1) Sorting the waste corundum-spinel castable and removing surface slag steel;
(2) Crushing the selected waste corundum-spinel castable, and then carrying out particle screening treatment;
(3) Drying and magnetically separating the particles qualified in the screening treatment;
(4) And grading and screening the dried and magnetically separated qualified particles again to obtain the qualified regenerated brown corundum raw material.
As a further scheme of the invention, the brown corundum is less than or equal to 5mm, the white corundum particles are less than or equal to 3mm, and the fine powder of the white corundum particles is less than or equal to 0.044mm.
As a further scheme of the invention, the electric smelting magnesia particles are less than or equal to 2mm, and the electric smelting magnesia fine powder is less than or equal to 0.074mm.
As a further scheme of the invention, the bonding agent comprises phosphate, light burned MgO powder, sulfurous acid paper pulp waste liquid and composite added SiO which are added separately 2 Micro powder, brine and SiO 2 Micro powder and sulfurous acid pulp waste liquid.
As a further aspect of the invention, the requirements of brown aluminaThe energy is as follows: 95.5w/% Al 2 O 3 0.45w/% MgO,0.63w/% CaO and 1.12w/% SiO 2 。
As a further aspect of the invention, the volume density of the brown fused alumina is 3.85 g.cm -3 。
As a further scheme of the invention, the required performances of the active composite spinel micropowder are as follows: 86.2w/% Al 2 O 3 11.79w/% MgO,0.3w/% CaO and 0.56w/% SiO 2 。
As a further scheme of the invention, the preparation method of the regenerated low-carbon corundum spinel impact plate comprises the following steps:
s1, proportioning and weighing raw materials according to a scheme;
s2, mixing the weighed raw materials according to a scheme proportion;
s3, uniformly mixing the granular materials during mixing, and then adding a binding agent to mix and stir for 3-5 min;
s4, mixing the fine powder, adding the fine powder mixture into the particle mixture after uniformly mixing, continuously mixing for 18-20 min, and discharging;
s5, forming the discharged material through a press to obtain a semi-finished product;
s6, naturally drying the semi-finished product for 24 hours, then placing the semi-finished product into an oven for drying, and performing heat treatment after the drying is finished, thus obtaining the impact plate.
As a further scheme of the invention, the temperature of the oven is 200 ℃, the time is 12 hours, the temperature of the heat treatment is 1000-1600 ℃ and the time is 3 hours.
Compared with the related art, the regenerated low-carbon corundum spinel impact plate and the preparation method thereof have the following beneficial effects:
1. the invention can greatly prolong the service life of the impact plate, and simultaneously can reduce the problems of resource waste and environmental pollution by extracting brown fused alumina from waste castable as a raw material for recycling.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG. 1 is a schematic diagram showing classification performance of binders according to the present invention;
FIG. 2 is a graph showing the line change rate after magnesia firing in the present invention;
FIG. 3 is a graph showing the residual strength of the active composite spinel micropowder of the present invention;
FIG. 4 is a graph showing the strength retention of the active composite spinel micropowder according to the present invention;
FIG. 5 is a schematic representation of the performance usage of the impingement plate of the present invention.
Detailed Description
Referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5 in combination, fig. 1 is a schematic diagram showing classification performance of the binding agent according to the present invention; FIG. 2 is a graph showing the line change rate after magnesia firing in the present invention; FIG. 3 is a graph showing the residual strength of the active composite spinel micropowder of the present invention; FIG. 4 is a graph showing the strength retention of the active composite spinel micropowder according to the present invention; FIG. 5 is a schematic representation of the performance usage of the impingement plate of the present invention. The regenerated low-carbon corundum spinel impact plate and the preparation method thereof comprise the following steps: the regenerated low-carbon corundum spinel impact plate is formed by processing the following raw materials:
brown corundum: 20-60%;
white corundum particles + white corundum particle fine powder: 15-25%;
fused magnesia particles + fused magnesia fines: 1 to 5 percent;
active composite spinel micropowder: 15-25%;
additive: 0.5 to 2 percent;
and (2) a binding agent: 2 to 6 percent.
The brown corundum is regenerated and extracted from waste corundum-spinel castable materials, and the extraction steps are as follows:
(1) Sorting the waste corundum-spinel castable and removing surface slag steel;
(2) Crushing the selected waste corundum-spinel castable, and then carrying out particle screening treatment;
(3) Drying and magnetically separating the particles qualified in the screening treatment;
(4) And grading and screening the dried and magnetically separated qualified particles again to obtain the qualified regenerated brown corundum raw material.
The brown corundum is less than or equal to 5mm, the white corundum particles are less than or equal to 3mm, and the fine powder of the white corundum particles is less than or equal to 0.044mm.
The grain size of the fused magnesia is less than or equal to 2mm, and the fine powder of the fused magnesia is less than or equal to 0.074mm.
The bonding agent comprises phosphate, light burned MgO powder, sulfurous acid paper pulp waste liquid and composite SiO 2 Micro powder, brine and SiO 2 Micro powder and sulfurous acid pulp waste liquid.
The required properties of the brown corundum are as follows: 95.5w/% Al 2 O 3 0.45w/% MgO,0.63w/% CaO and 1.12w/% SiO 2 。
The volume density of the brown corundum is 3.85g cm -3 。
The required performances of the active composite spinel micropowder are as follows: 86.2w/% Al 2 O 3 11.79w/% MgO,0.3w/% CaO and 0.56w/% SiO 2 。
The preparation method of the regenerated low-carbon corundum spinel impact plate comprises the following steps:
s1, proportioning and weighing raw materials according to a scheme;
s2, mixing the weighed raw materials according to a scheme proportion;
s3, uniformly mixing the granular materials during mixing, and then adding a binding agent to mix and stir for 3-5 min;
s4, mixing the fine powder, adding the fine powder mixture into the particle mixture after uniformly mixing, continuously mixing for 18-20 min, and discharging;
s5, forming the discharged material through a press to obtain a semi-finished product;
s6, naturally drying the semi-finished product for 24 hours, then placing the semi-finished product into an oven for drying, and performing heat treatment after the drying is finished, thus obtaining the impact plate.
The temperature of the oven is 200 ℃, the time is 12 hours, the temperature of the heat treatment is 1000-1600 ℃, and the time is 3 hours.
In the process of carrying, packaging, transporting and building, certain strength is required to be maintained, the normal temperature compressive strength is required to be more than 30MPa for safety, so that the selection of a proper binding agent is very critical, as can be seen from figure 1, besides the fact that the strength of an impact plate combined by phosphate and sulfurous acid paper pulp waste liquid is not in accordance with the requirement, the finished products combined by the other three binding agents all meet the requirement, but the light burned MgO powder has short storage period, the activity is not easy to control, the quality is difficult to ensure, and the SiO is difficult to ensure 2 Various indexes of the finished product of the binding agent prepared from micro powder and brine are superior to those of SiO 2 Binding agent made of micropowder and sulfurous acid paper pulp waste liquid, so that the invention adopts SiO finally 2 The mode of combining micro powder and brine is used as the binding agent of the developed impact plate.
Because the granularity of the magnesite is finer, the magnesite is more similar to Al 2 O 3 The reaction speed for forming spinel is faster, and conversely, the reaction speed is slower, meanwhile, the critical granularity of magnesia is increased, the penetration depth of slag in the material is increased, and the erosion amount is gradually reduced, so that adding a certain amount of coarse-grain magnesia is beneficial to avoiding a large amount of spinel to be generated rapidly and reducing reaction expansion, thereby being beneficial to avoiding cracking and flaking generated in the high-temperature use of the unburned ladle brick, and therefore, in order to avoid severe expansion and post-sintering of the impact plate in the use process, the magnesia adopts a particle and fine powder matched mode.
Fig. 2 is a graph showing the linear change rate of the impact plate added with different amounts of fused magnesia after firing at 1600 ℃ for 3 hours under the condition that the adding amount of the active composite spinel micropowder is unchanged, and as can be seen from fig. 2, slight expansion is generated in the impact plate when the adding mass fraction of the magnesia is 3%, the linear expansion is obviously increased after firing after adding mass fraction is more than 4%, and as is known, the impact plate has overlarge line shrinkage after firing, plate seam overlarge, steel drilling phenomenon can be generated, and the expansion after firing is overlarge, stress is larger, and structural peeling is easily caused, so that the suitable magnesia adding mass fraction in the invention is 4%.
In fig. 3 and fig. 4, the effect of the addition amount of the active composite spinel fine powder on the thermal shock resistance of the impact plate is shown in fig. 2 under the condition that the addition amount of the magnesia fine powder and the corundum fine powder is adjusted to keep the MgO content unchanged, as the addition amount of the active composite spinel fine powder increases, the thermal shock resistance of the impact plate tends to be improved before becoming worse, similar to the change of the strength of the impact plate, when the addition amount of the composite fine powder is less than or equal to 20%, the thermal shock resistance of the impact plate can be improved, but when the addition amount of the composite fine powder is less than or equal to 20%, the thermal shock resistance of the impact plate is obviously deteriorated, and therefore, when the addition amount of the composite fine powder is 15% and 20%, the continuous spinel phase generated in the matrix at a high temperature is filled between particles, and a proper amount of spinel phase is generated when the addition amount of the composite fine powder is proper, and thermal stress can be effectively buffered, so that the thermal shock resistance of the impact plate is improved, but when the addition amount of the composite fine powder is too high, the thermal shock resistance of the composite fine powder is greatly reduced, and the thermal shock resistance of the impact plate is reduced, due to the fact that the composite fine powder is greatly-expanded, and the thermal shock resistance of the composite fine powder is 20%.
As can be seen from Table 5, the impingement plates all erode at a lower rate than conventional impingement plates (1.09 mm. Furnace) -1 ) The residual thickness is greater than the safety residual thickness (more than or equal to 50 mm) required by the impact plate, so that the service life of the impact plate can be stabilized to more than 140 furnaces, the service life of the impact plate is prolonged by more than 30 furnaces compared with that of the traditional impact plate, and the safety and the adaptability of the impact plate can meet the production process requirements.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (10)
1. A regenerative low carbon corundum spinel impact plate, comprising:
the regenerated low-carbon corundum spinel impact plate is formed by processing the following raw materials:
brown corundum: 20-60%;
white corundum particles + white corundum particle fine powder: 15-25%;
fused magnesia particles + fused magnesia fines: 1 to 5 percent;
active composite spinel micropowder: 15-25%;
additive: 0.5 to 2 percent;
and (2) a binding agent: 2 to 6 percent.
2. A regenerative low carbon corundum spinel impingement plate as claimed in claim 1, wherein: the brown corundum is regenerated and extracted from waste corundum-spinel castable materials, and the extraction steps are as follows:
(1) Sorting the waste corundum-spinel castable and removing surface slag steel;
(2) Crushing the selected waste corundum-spinel castable, and then carrying out particle screening treatment;
(3) Drying and magnetically separating the particles qualified in the screening treatment;
(4) And grading and screening the dried and magnetically separated qualified particles again to obtain the qualified regenerated brown corundum raw material.
3. A regenerative low carbon corundum spinel impingement plate as claimed in claim 1, wherein: the brown corundum is less than or equal to 5mm, the white corundum particles are less than or equal to 3mm, and the fine powder of the white corundum particles is less than or equal to 0.044mm.
4. A regenerative low carbon corundum spinel impingement plate as claimed in claim 1, wherein: the grain size of the fused magnesia is less than or equal to 2mm, and the fine powder of the fused magnesia is less than or equal to 0.074mm.
5. A regenerative low carbon corundum spinel impingement plate as claimed in claim 1, wherein: the binding agent comprises phosphate added separately and lightMgO powder, sulfurous acid paper pulp waste liquid and composite added SiO 2 Micro powder, brine and SiO 2 Micro powder and sulfurous acid pulp waste liquid.
6. A regenerative low carbon corundum spinel impingement plate as claimed in claim 1, wherein: the required properties of the brown corundum are as follows: 95.5w/% Al 2 O 3 0.45w/% MgO,0.63w/% CaO and 1.12w/% SiO 2 。
7. A regenerative low carbon corundum spinel impingement plate as claimed in claim 1, wherein: the volume density of the brown corundum is 3.85g cm -3 。
8. A regenerative low carbon corundum spinel impingement plate as claimed in claim 1, wherein: the required performances of the active composite spinel micropowder are as follows: 86.2w/% Al 2 O 3 11.79w/% MgO,0.3w/% CaO and 0.56w/% SiO 2 。
9. A method for preparing the regenerated low-carbon corundum spinel impact plate of claim 1, which is characterized by comprising the following steps:
s1, proportioning and weighing raw materials according to a scheme;
s2, mixing the weighed raw materials according to a scheme proportion;
s3, uniformly mixing the granular materials during mixing, and then adding a binding agent to mix and stir for 3-5 min;
s4, mixing the fine powder, adding the fine powder mixture into the particle mixture after uniformly mixing, continuously mixing for 18-20 min, and discharging;
s5, forming the discharged material through a press to obtain a semi-finished product;
s6, naturally drying the semi-finished product for 24 hours, then placing the semi-finished product into an oven for drying, and performing heat treatment after the drying is finished, thus obtaining the impact plate.
10. The method for preparing the regenerated low-carbon corundum spinel impact plate according to claim 9, which is characterized in that: the temperature of the oven is 200 ℃, the time is 12 hours, the temperature of the heat treatment is 1000-1600 ℃, and the time is 3 hours.
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| EP2918564A1 (en) * | 2014-03-13 | 2015-09-16 | LANXESS Deutschland GmbH | Refractory materials containing a mixed crystal with spinel structure |
| FR3024140A1 (en) * | 2014-07-28 | 2016-01-29 | Ct De Transfert De Technologies Ceramiques C T T C | COMPOSITE MATERIAL COMPRISING CERAMIC OBJECTS IN A BONDING MATRIX AND METHOD OF MANUFACTURING SUCH MATERIAL |
| CN114292095A (en) * | 2022-01-11 | 2022-04-08 | 河南竹林庆州耐火材料有限公司 | Preparation method of low-carbon corundum spinel impact brick suitable for smelting various steels |
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| JP2002193681A (en) * | 2000-12-22 | 2002-07-10 | Asahi Glass Co Ltd | Castable refractory and waste melting furnace utilizing it |
| EP2918564A1 (en) * | 2014-03-13 | 2015-09-16 | LANXESS Deutschland GmbH | Refractory materials containing a mixed crystal with spinel structure |
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