CN114873995B - Low-expansion high-fracture-resistance tundish retaining wall castable - Google Patents
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 96
- 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 51
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 239000000835 fiber Substances 0.000 claims abstract description 25
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 24
- 239000010431 corundum Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000004568 cement Substances 0.000 claims abstract description 13
- 239000002699 waste material Substances 0.000 claims abstract description 12
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000428 dust Substances 0.000 claims abstract description 11
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims abstract description 11
- 235000019799 monosodium phosphate Nutrition 0.000 claims abstract description 11
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims abstract description 11
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 9
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000010703 silicon Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 238000005266 casting Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229910001120 nichrome Inorganic materials 0.000 claims description 3
- 239000003643 water by type Substances 0.000 claims description 3
- 229910001570 bauxite Inorganic materials 0.000 abstract description 6
- 239000011819 refractory material Substances 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract 2
- 239000002893 slag Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 230000003628 erosive effect Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 239000002131 composite material Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 229910052596 spinel Inorganic materials 0.000 description 4
- 239000011029 spinel Substances 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 229910052839 forsterite Inorganic materials 0.000 description 3
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 150000004645 aluminates Chemical class 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
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 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
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
Abstract
The invention relates to the technical field of tundish working layer refractory materials, in particular to a low-expansion high-fracture-resistance tundish retaining wall castable, which comprises the following raw material components in percentage by mass: the invention has the advantages of low expansion coefficient, high breaking strength, moderate molten steel purification function by design compared with the prior art, and the invention has the advantages of low cost and moderate molten steel purification function by designing, wherein the raw materials comprise 13-16% of 85 bauxite with the grain diameter of 15-8mm, 13-16% of 85 bauxite with the grain diameter of 8-5mm, 6-8% of 85 bauxite with the grain diameter of 5-3mm, 6-10% of 85 bauxite with the grain diameter of 6-1-10% of 91 magnesia with the grain diameter of 1-10%, 4-9% of 91 magnesia with the grain diameter of 3-1mm, 3-5% of 95 magnesia with the grain diameter of 200 meshes, 10-13% of white corundum dust removing powder, 2-5% of chrome corundum waste, 2% of silicon micropowder, 1-2% of alumina, 0.2-0.5% of 71 cement, 0.2-0.3% of sodium dihydrogen phosphate, 0.05-0.1% of sodium tripolyphosphate, 0.1% of organic fiber and 1-1.5% of steel fiber.
Description
Technical Field
The invention relates to the technical field of tundish working layer refractory materials, in particular to a low-expansion high-fracture-resistance tundish retaining wall castable.
Background
The tundish retaining wall plays an extremely critical role in the tundish refractory material configuration, and has the main effects of eliminating a slow flow area or a stagnation area of molten steel in the tundish, adjusting the flow field of the molten steel, enabling the molten steel to flow along a steel slag interface, shortening the floating time and distance of harmful inclusions in the molten steel, being beneficial to purifying the molten steel and slowing down the fluctuation of the molten steel temperature at different parts in the tundish. The whole retaining wall is immersed in molten steel in the use process, the temperature is higher than 1500 ℃ and even up to 1550 ℃, and meanwhile, the retaining wall is impacted by the pressure difference of the molten steel at two sides of the retaining wall, so that the retaining wall needs to have higher strength under the high-temperature condition. Therefore, the existing tundish retaining wall material mainly takes alumina particles-corundum powder series, and castable material composed of a small amount of binding agent and adjusting components is prefabricated and formed, and can be used on line after being baked. Therefore, alumina/magnesia composite type tundish retaining wall casting materials are attracting attention, and both performance and cost can be well considered.
However, the alumina/magnesia composite tundish retaining wall castable has the defect of larger high-temperature linear expansion coefficient, particularly under the condition of larger retaining wall size, the magnesia with low cost is limited in addition amount, the high-temperature strength is rapidly reduced due to excessive addition, accidents such as fracture and collapse are easy to occur during use, great potential safety hazard is brought, a large amount of molten steel is polluted during the accidents, and the loss is large. Therefore, there is an urgent need to develop a low-expansion high-fracture-resistance tundish retaining wall casting material based on alumina/magnesia composite, which can reduce cost and meet the use requirements, in particular to meet the use requirements of long-service-life tundish.
The Chinese patent (application number: 201910071941.7) discloses a slag blocking wall castable for a tundish with high alkalinity resistance and a preparation method thereof, wherein the castable comprises the following raw materials in parts by weight: 50-80 parts of high bauxite, 5-15 parts of sintered bauxite spinel fine powder, 3-8 parts of sintered magnesia particles, 3-8 parts of sintered magnesia fine powder, 6-12 parts of alpha-Al 2O3 micro powder, 2-6 parts of aluminate cement, 0.5-1 part of silica micro powder, 0-3 parts of stainless steel fiber, 0-0.2 part of explosion-proof agent and 0.1-0.4 part of water reducer. The scheme solves the serious problem of high alkalinity steel slag corrosion encountered by the continuous casting tundish slag wall during steel casting, and utilizes the characteristic of good alkaline steel slag corrosion resistance of magnesia-alumina spinel, adopts the technology of adding pre-synthesized spinel and generating spinel by in-situ reaction, prepares the tundish slag wall product capable of meeting the use requirement of high alkalinity steel slag, and fully meets the requirement of clients for smelting clean steel.
The invention of China (application number: 201010257943.4) discloses a casting material for a forsterite tundish slag blocking wall and a production process thereof, wherein the casting material is prepared from the following raw materials, by weight, 5-70 parts of forsterite, 15-85 parts of magnesia, 5-15 parts of corundum powder, 3-5 parts of a composite additive, 0.1 part of an organic fiber and 1 part of a steel fiber. The production process includes mixing aggregate material in the material in a stirrer, adding fine powder and composite additive, stirring for 2-3 min, adding water, stirring for 2-3 min, discharging, vibration forming, curing, drying and packing. The scheme adopts the combined action of the forsterite and the magnesia, reduces the formula cost of the product, and ensures the construction performance and the service performance of the product when the product strength is improved by adopting the composite additive, the organic fiber, the steel fiber and the like with good performance.
Disclosure of Invention
The invention aims to provide a low-expansion high-fracture-resistance tundish retaining wall casting material to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
A low-expansion high-fracture-resistance tundish retaining wall castable comprises the following raw materials in percentage by mass: 13-16% of 85 alumina with the grain size of 15-8mm, 13-16% of 85 alumina with the grain size of 8-5mm, 6-8% of 85 alumina with the grain size of 5-3mm, 6-10% of 85 alumina with the grain size of 3-1mm, 5-10% of 85 alumina with the grain size of 1-0mm, 6-10% of 91 magnesia with the grain size of 5-3mm, 6-10% of 91 magnesia with the grain size of 3-1mm, 4-9% of 95 magnesia with the grain size of 1-0mm, 3-5% of 95 magnesia with the grain size of 200 meshes, 10-13% of white corundum dust removing powder, 2-5% of chrome corundum waste, 2% of silica micropowder, 1-2% of alumina, 0.2-0.5% of 71 cement, 0.2-0.3% of sodium dihydrogen phosphate, 0.05-0.1% of sodium tripolyphosphate, 0.1-0.3% of organic fiber and 1-1.5% of steel fiber;
the sum of the 85 alumina with the grain diameter of 3-1mm and 91 magnesia with the grain diameter of 3-1mm is more than or equal to 15 percent and less than or equal to 19 percent; the sum of the 85 alumina with the grain size of 1-0mm and the 95 magnesia with the grain size of 1-0mm is more than or equal to 12 percent and less than or equal to 18 percent;
The sum of the contents of 91 magnesia and 95 magnesia is more than or equal to 24 percent and less than or equal to 32 percent.
As a preferable embodiment of the invention, the 85 alumina with the grain size of 15-8mm is 15%, the 85 alumina with the grain size of 8-5mm is 16%, the 85 alumina with the grain size of 5-3mm is 7%, the 85 alumina with the grain size of 3-1mm is 9%, the 85 alumina with the grain size of 1-0mm is 8.2%, the 91 magnesia with the grain size of 5-3mm is 9%, the 91 magnesia with the grain size of 3-1mm is 8%, the 95 magnesia with the grain size of 1-0mm is 4%, the 95 magnesia with the grain size of 200 meshes is 3.5%, the white corundum dust removing powder is 12%, the chrome corundum waste is 3%, the silica micropowder is 2%, the alumina is 1.4%, the 71 cement is 0.3%, the sodium dihydrogen phosphate is 0.22%, the sodium tripolyphosphate is 0.08%, the organic fiber is 0.15% and the steel fiber is 1.15%.
As a preferable scheme of the invention, the granularity of the white corundum dust-removing powder is 200 meshes, and Al 2O3 is more than or equal to 95 percent; the granularity of the chrome corundum waste material is 200 meshes, and Cr 2O3 is more than or equal to 60 percent; siO 2 in the silicon micropowder is more than or equal to 92%; the crystal form of the alumina is alpha type, and the granularity is 1 mu m; the Al 2O3 content in the 71 cement is +/-2%; sodium dihydrogen phosphate is industrial grade and contains 2 crystal waters; sodium tripolyphosphate is of industrial grade; the melting point of the organic fiber is 105 ℃; the steel fiber is nichrome heat-resistant steel.
As a preferable scheme of the invention, the water adding rate of the retaining wall casting material is 5.3-5.5% during mixing.
Compared with the prior art, the invention has the beneficial effects that:
1. According to the invention, white corundum dust removing powder and chrome corundum waste are selected from flue gas dust removing powder and used refractory waste for recycling, so that the high-temperature strength of the retaining wall is improved, and meanwhile, the erosion resistance of the retaining wall is greatly improved, so that the retaining wall has the characteristic of long service life, is matched with a long-service-life tundish for use, and can effectively improve the tapping amount of a single wire-feeding tundish for times.
2. In the invention, sodium dihydrogen phosphate is selected to replace common sodium hexametaphosphate to be introduced as a binding agent, so that the storage time of the mixture before being stirred by adding water can be greatly prolonged, the caking phenomenon caused by overlong stacking time or moisture absorption of the mixture in a workshop is avoided, and the on-site manufacturing is facilitated, therefore, the invention has the advantages of low expansion coefficient, high flexural strength, moderate cost and molten steel purifying function by design
Detailed Description
In the following, the technical solutions of the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
The invention provides a technical scheme that:
A low-expansion high-fracture-resistance tundish retaining wall castable comprises the following raw materials in percentage by mass: 13-16% of 85 alumina with the grain size of 15-8mm, 13-16% of 85 alumina with the grain size of 8-5mm, 6-8% of 85 alumina with the grain size of 5-3mm, 6-10% of 85 alumina with the grain size of 3-1mm, 5-10% of 85 alumina with the grain size of 1-0mm, 6-10% of 91 magnesia with the grain size of 5-3mm, 4-9% of 95 magnesia with the grain size of 3-1mm, 3-5% of 95 magnesia with the grain size of 200 meshes, 10-13% of white corundum dust removal powder, 2-5% of chrome corundum waste, 2% of silica micropowder, 1-2% of aluminum oxide, 0.2-0.5% of 71 cement, 0.2-0.3% of sodium dihydrogen phosphate, 0.05-0.1% of sodium tripolyphosphate, 0.1-0.3% of organic fiber and 1-1.5% of steel fiber, and the sum of 91% of 85 and 91% of 3-1mm magnesia with the grain size is more than or equal to 15% and less than or equal to 19%; the sum of the 85 alumina with the grain size of 1-0mm and the 95 magnesia with the grain size of 1-0mm is more than or equal to 12 percent and less than or equal to 18 percent, and the sum of the 91 magnesia and the 95 magnesia is more than or equal to 24 percent and less than or equal to 32 percent. In a preferred embodiment of the present invention, the 85 alumina having a grain size of 15 to 8mm is 15%, the 85 alumina having a grain size of 8 to 5mm is 16%, the 85 alumina having a grain size of 5 to 3mm is 7%, the 85 alumina having a grain size of 3 to 1mm is 9%, the 85 alumina having a grain size of 1 to 0mm is 8.2%, the 91 magnesia having a grain size of 5 to 3mm is 9%, the 91 magnesia having a grain size of 3 to 1mm is 8%, the 95 magnesia having a grain size of 1 to 0mm is 4%, the 95 magnesia having a grain size of 200 meshes is 3.5%, the white corundum dust removing powder is 12%, the chrome corundum waste is 3%, the silica micropowder is 2%, the alumina is 1.4%, the 71 cement is 0.3%, the sodium dihydrogen phosphate is 0.22%, the sodium tripolyphosphate is 0.08%, the organic fiber is 0.15% and the steel fiber is 1.15%.
As a preferred implementation mode of the invention, the granularity of the white corundum dust removing powder is 200 meshes, and Al 2O3 is more than or equal to 95 percent; the granularity of the chrome corundum waste material is 200 meshes, and Cr 2O3 is more than or equal to 60 percent; siO 2 in the silicon micropowder is more than or equal to 92%; the crystal form of the alumina is alpha type, and the granularity is 1 mu m; the Al 2O3 content in the 71 cement is +/-2%; sodium dihydrogen phosphate is industrial grade and contains 2 crystal waters; sodium tripolyphosphate is of industrial grade; the melting point of the organic fiber is 105 ℃; the steel fiber is nichrome heat-resistant steel.
As a preferable implementation mode of the invention, the water adding rate of the retaining wall casting material is 5.3-5.5% when mixing materials.
The specific implementation cases are as follows:
the following provides a specific embodiment of the low expansion high fracture resistance tundish retaining wall casting material.
The mass fractions of the raw material components of the low-expansion high-fracture-resistance tundish retaining wall castable of examples 1-6 and comparative examples 1-4 are shown in table 1;
TABLE 1 raw material compositions (wt%) of examples 1 to 6 and comparative examples 1 to 4
The pouring basket retaining wall castable of this scheme, qualified product detects the index range and is: the water adding rate is 5.3 to 5.5 weight percent; the volume density is more than or equal to 2.85g cm 3; the linear change rate is 0-0.5% at 1100 ℃/3h and 0-1% at 1550 ℃/3 h; the flexural strength is more than or equal to 10MPa at 110 ℃, more than or equal to 6MPa at 1100 ℃/3h, and more than or equal to 11.7MPa at 1550 ℃/3 h; the compressive strength is more than or equal to 70MPa at 110 ℃, more than or equal to 55MPa at 1100 ℃/3h, and more than or equal to 55MPa at 1550 ℃/3 h; the processing performance is as follows: good; slag resistance: has no penetration and good erosion resistance.
Sample preparation is carried out on the low-expansion high-fracture-resistance tundish retaining wall castable of the examples 1-6 and the comparative examples 1-4 according to GB/T4513.5, and the tests of volume density, linear change rate, fracture strength and compressive strength are carried out according to the test method in GB/T4513.6; judging slag resistance by adopting a static crucible method, and observing permeation resistance and erosion resistance of a refractory material in the middle section of the crucible; the test results are shown in Table 2.
Table 2 test results of examples 1 to 6 and comparative examples 1 to 4
From the comparison of the data in tables 1 and 2, it can be seen that: the low-expansion high-fracture-resistance tundish retaining wall castable has the advantages of low expansion coefficient, high fracture strength, moderate cost and molten steel purifying function;
The 85 alumina with the grain size of 15-8mm in comparative example 1 is higher than 20wt%, and at the moment, too many large grains exist in the castable, so that the processability during mixing is reduced, local cavities are easy to exist in the inside after molding, and the strength is reduced and the permeation resistance is insufficient. The test results show that: the flexural strength is 9.5MPa at 110 ℃, 7.3MPa at 1550 ℃/3h, the processability is poor, the permeation resistance is small amount of permeation, and the detection result is unqualified;
The sodium tripolyphosphate in comparative example 2, which is 0.25wt% higher, can result in reduced fluidity and increased water addition rate during stirring, can reduce processability and is detrimental to erosion resistance, and is prone to cracking during post-mold baking, reducing yield. The test results show that: the water adding rate is 5.76wt percent, the processing performance is poor, and the erosion resistance is poor;
A high content of 71 cement of comparative example 3 of 0.8wt% results in rapid local overburning of the castable and a rapid decrease in the strength at medium and low temperatures, and CaO contained in the 71 cement is detrimental to erosion resistance. The test results show that: the linear change rate is-0.13% at 1550 ℃/3h, the flexural strength is 5.8MPa at 110 ℃, 5.1MPa at 1100 ℃/3h, 10.8MPa at 1550 ℃/3h, the compressive strength is 48.4MPa at 110 ℃, 43.9MPa at 1100 ℃/3h, 47.4MPa at 1550 ℃/3h, and the erosion resistance is poor;
The 95 magnesia with the grain size of 200 meshes in comparative example 4 has a content of 8wt% which is higher, the sum of 85 alumina with the grain size of 3-1mm and 91 magnesia with the grain size of 3-1mm has a content of 13wt% which is lower, the reaction of aluminum, magnesium and silicon under the high temperature condition is stronger, the thermal expansion coefficient is increased, the sintering phenomenon under the high temperature condition is promoted, and the high temperature strength is unfavorable. The test results show that: the line change rate was 1.45% at 1550 ℃/3h, with poor erosion resistance.
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 (4)
1. The low-expansion high-fracture-resistance tundish retaining wall castable is characterized by comprising the following raw material components in percentage by mass: 13-16% of 85 alumina with the grain size of 15-8mm, 13-16% of 85 alumina with the grain size of 8-5mm, 6-8% of 85 alumina with the grain size of 5-3mm, 6-10% of 85 alumina with the grain size of 3-1mm, 5-10% of 85 alumina with the grain size of 1-0mm, 6-10% of 91 magnesia with the grain size of 5-3mm, 6-10% of 91 magnesia with the grain size of 3-1mm, 4-9% of 95 magnesia with the grain size of 1-0mm, 3-5% of 95 magnesia with the grain size of 200 meshes, 10-13% of white corundum dust removing powder, 2-5% of chrome corundum waste, 2% of silica micropowder, 1-2% of alumina, 0.2-0.5% of 71 cement, 0.2-0.3% of sodium dihydrogen phosphate, 0.05-0.1% of sodium tripolyphosphate, 0.1-0.3% of organic fiber and 1-1.5% of steel fiber;
the sum of the 85 alumina with the grain diameter of 3-1mm and 91 magnesia with the grain diameter of 3-1mm is more than or equal to 15 percent and less than or equal to 19 percent; the sum of the 85 alumina with the grain size of 1-0mm and the 95 magnesia with the grain size of 1-0mm is more than or equal to 12 percent and less than or equal to 18 percent;
The sum of the contents of 91 magnesia and 95 magnesia is more than or equal to 24 percent and less than or equal to 32 percent.
2. The low expansion high fracture-resistant tundish retaining wall casting material according to claim 1, wherein the 85 alumina with the grain size of 15-8mm is 15%, the 85 alumina with the grain size of 8-5mm is 16%, the 85 alumina with the grain size of 5-3mm is 7%, the 85 alumina with the grain size of 3-1mm is 9%, the 85 alumina with the grain size of 1-0mm is 8.2%, the 91 magnesia with the grain size of 5-3mm is 9%, the 91 magnesia with the grain size of 3-1mm is 8%, the 95 magnesia with the grain size of 1-0mm is 4%, the 95 magnesia with the grain size of 200 meshes is 3.5%, the white corundum dust removing powder is 12%, the chrome corundum waste is 3%, the silica micropowder is 2%, the alumina is 1.4%, the 71 cement is 0.3%, the sodium dihydrogen phosphate is 0.22%, the sodium tripolyphosphate is 0.08%, the organic fiber is 0.15% and the steel fiber is 1.15%.
3. The low-expansion high-fracture-resistance tundish retaining wall casting material according to claim 1, wherein the granularity of the white corundum dust removing powder is 200 meshes, and Al 2O3 is more than or equal to 95%; the granularity of the chrome corundum waste material is 200 meshes, and Cr 2O3 is more than or equal to 60 percent; siO 2 in the silicon micropowder is more than or equal to 92%; the crystal form of the alumina is alpha type, and the granularity is 1 mu m; the Al 2O3 content in the 71 cement is +/-2%; sodium dihydrogen phosphate is industrial grade and contains 2 crystal waters; sodium tripolyphosphate is of industrial grade; the melting point of the organic fiber is 105 ℃; the steel fiber is nichrome heat-resistant steel.
4. The low expansion high fracture-resistant tundish retaining wall casting material according to claim 1, wherein the water adding rate of the retaining wall casting material during mixing is 5.3-5.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210509610.9A CN114873995B (en) | 2022-05-11 | Low-expansion high-fracture-resistance tundish retaining wall castable |
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| CN202210509610.9A CN114873995B (en) | 2022-05-11 | Low-expansion high-fracture-resistance tundish retaining wall castable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1686948A (en) * | 2005-04-08 | 2005-10-26 | 上海彭浦特种耐火材料厂 | Improved type casting material based on bauxite for middle-small type ladle and preparation method |
| CN101157561A (en) * | 2007-09-05 | 2008-04-09 | 江苏国窑科技有限公司 | Abrasion-proof fire-resistant moldable refractory |
| CN112794702A (en) * | 2020-12-30 | 2021-05-14 | 上海利尔耐火材料有限公司 | Steel ladle wall castable containing white corundum dust removal powder and preparation method thereof |
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1686948A (en) * | 2005-04-08 | 2005-10-26 | 上海彭浦特种耐火材料厂 | Improved type casting material based on bauxite for middle-small type ladle and preparation method |
| CN101157561A (en) * | 2007-09-05 | 2008-04-09 | 江苏国窑科技有限公司 | Abrasion-proof fire-resistant moldable refractory |
| CN112794702A (en) * | 2020-12-30 | 2021-05-14 | 上海利尔耐火材料有限公司 | Steel ladle wall castable containing white corundum dust removal powder and preparation method thereof |
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