CN116874289A - Preparation method of novel high-temperature-resistant high-strength aluminum-magnesium castable - Google Patents
Preparation method of novel high-temperature-resistant high-strength aluminum-magnesium castable Download PDFInfo
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- CN116874289A CN116874289A CN202310911789.5A CN202310911789A CN116874289A CN 116874289 A CN116874289 A CN 116874289A CN 202310911789 A CN202310911789 A CN 202310911789A CN 116874289 A CN116874289 A CN 116874289A
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- castable
- fine powder
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- temperature
- magnesia
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- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000000843 powder Substances 0.000 claims abstract description 67
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 41
- 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 36
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000010431 corundum Substances 0.000 claims abstract description 28
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 28
- 229910001868 water Inorganic materials 0.000 claims abstract description 26
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 22
- 238000007599 discharging Methods 0.000 claims abstract description 14
- 239000002270 dispersing agent Substances 0.000 claims abstract description 13
- 238000000465 moulding Methods 0.000 claims abstract description 11
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 239000010703 silicon Substances 0.000 claims abstract description 9
- 238000005266 casting Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims description 26
- 239000002245 particle Substances 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 12
- 239000000654 additive Substances 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 9
- 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 9
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 9
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 9
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000001095 magnesium carbonate Substances 0.000 claims description 4
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 4
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 4
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims 1
- 239000011777 magnesium Substances 0.000 claims 1
- 229910052749 magnesium Inorganic materials 0.000 claims 1
- 238000003801 milling Methods 0.000 claims 1
- 238000003756 stirring Methods 0.000 abstract description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 8
- 230000003628 erosive effect Effects 0.000 abstract description 4
- 238000009991 scouring Methods 0.000 abstract description 3
- 239000007788 liquid Substances 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 239000002893 slag Substances 0.000 description 9
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 6
- 150000004645 aluminates Chemical class 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000013329 compounding Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 239000008213 purified water Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 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 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052609 olivine Inorganic materials 0.000 description 1
- 239000010450 olivine Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 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
- C04B35/01—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
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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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- 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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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
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Abstract
The invention provides a preparation method of a novel high-temperature-resistant high-strength aluminum-magnesium castable, which comprises the following steps of firstly premixing silicon micropowder, magnesia fine powder and a dispersing agent in a vibration ball mill for 20-30 min according to a certain proportion, fully mixing the silicon micropowder, the magnesia fine powder and a reinforcing agent, and sealing the mixed fine powder for later use; secondly, premixing high-alumina aggregate, corundum fine powder, magnesia fine powder, alumina fine powder, silica fine powder and premix in a mixer according to a certain proportion for 6-8 min, and discharging for later use; finally, adding water into a wet mixer, stirring, adding water by 5-6%, stirring to ensure that the castable is discharged after good fluidity, putting into a special mould for vibration molding, and casting into various high-temperature-resistant prefabricated parts; the invention has the advantages of low cost, high refractoriness, excellent normal temperature strength, strong high temperature liquid erosion resistance and scouring resistance, and the like, and can be widely applied to high temperature containers at the temperature of more than or equal to 1600 ℃.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a preparation method of a novel high-temperature-resistant high-strength aluminum-magnesium castable.
Background
At present, in the high-temperature resistant castable, the bonding agent is generally pure aluminate cement matched with a high-efficiency water reducer. Under the action of the high-efficiency water reducing agent, the pouring water adding amount can be greatly reduced under the condition of low cement adding amount, so that higher normal-temperature strength is obtained.
Cement bonded castable materials have several drawbacks: firstly, as the carboxylic acid-based water reducer is generally adopted in the cement-combined castable, the through air holes formed in the castable are greatly reduced, and the castable is extremely easy to burst during baking; secondly, as the cement contains a small amount of CaO, the CaO reacts with Al2O3 and SiO2 in the castable to generate low-melting-point substances at high temperature, and the service life of the castable at high temperature can be seriously reduced; thirdly, the initial setting rate of the castable combined with aluminate cement is particularly sensitive to temperature, if the control is not good, the normal temperature strength of the castable can be seriously affected, so that the produced prefabricated member has unstable normal temperature strength, is high in time and low in time, and can lose the long-distance transportation capability seriously; fourth, the castable using aluminate cement as a binder has poor thermal shock stability due to a large difference between medium and high temperature strength.
Therefore, in order to overcome the defect of cement-bonded castable, the invention prepares the high-temperature-resistant and high-strength aluminum-magnesium castable by taking magnesia, silica micropowder and water as a bonding system and matching with a composite reinforcing agent.
Disclosure of Invention
In order to solve the technical problems, the invention provides a preparation method of a novel high-temperature-resistant high-strength aluminum magnesium castable, which aims to solve the problems described in the background art.
The invention provides a preparation method of a novel high-temperature-resistant high-strength aluminum-magnesium castable, which is achieved by the following specific technical means: a preparation method of a novel high-temperature-resistant high-strength aluminum-magnesium castable comprises the following components in parts by weight:
high aluminum aggregate with granularity of 20-0.15 mm: 65-70%;
corundum fine powder with granularity less than 0.075 mm: 7-12%;
magnesite fine powder with particle size less than 0.075 mm: 8-13%;
calcined alumina micropowder with particle size D50 less than 3 um: 2-6%;
silica micropowder D50 is less than or equal to 2um: 2-5%;
composite reinforcing agent: 2-4%;
dispersing agent and explosion-proof agent: 0.5-1%;
the sum of the mass percentages of the components is 100 percent.
As a further scheme of the invention, the castable composition comprises: 70% of high-alumina aggregate, wherein the maximum grain diameter of the aggregate is 20mm, and the minimum grain diameter of the aggregate is 0.15mm;8% of sintered corundum or fused corundum fine powder, and the grain size is less than or equal to 0.075mm;13% of magnesia fine powder with the grain diameter less than or equal to 0.075mm;4% of calcined alumina micropowder with the particle diameter D50 being less than or equal to 3um;3% of a composite reinforcing agent; 4% of silicon dioxide micropowder with the particle diameter D50 being less than or equal to 2um;0.2% of a complex dispersant; 0.15% of explosion-proof organic fiber.
As a further scheme of the invention, the castable material index comprises: al of high-alumina aggregate 2 O 3 ≥83%，Fe 2 O 3 Less than or equal to 1.5 percent, and the volume density of aggregate is more than or equal to 2.85g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Al of corundum fine powder 2 O 3 More than or equal to 99 percent, sintered corundum or fused corundum; mgO of the magnesia fine powder is more than or equal to 97 percent, and the magnesia fine powder can be fused magnesia and sintered magnesia; the alumina micropowder is calcined alumina micropowder, al 2 O 3 The content is more than or equal to 99 percent, and D50 is less than or equal to 3um; siO of silicon micropowder 2 More than or equal to 96%, wherein the PH requirement is 9-10, and the flow value after water addition is 9-10 mm; the composite reinforcing agent is prepared by co-grinding fused magnesia micro powder and silica micro powder in a ratio of 6:1 with the addition of a phosphate additive in a ball mill; the dispersing agent is formed by compounding sodium tripolyphosphate and sodium hexametaphosphate according to the proportion of 1:1 or 2:1; the organic fiber is an organic explosion-proof fiber with a melting point of about 100 ℃.
As a further aspect of the present invention, the step of preparing the castable includes:
s1: preparing a composite reinforcing agent, namely using fused magnesia fine powder and silica micropowder as the composite reinforcing agent, adding an organic reinforcing agent, mixing in a vibration ball mill for 20-30 min, discharging, and quantitatively bagging for later use;
s2: according to the scheme weight ratio, high-alumina aggregate, corundum fine powder, magnesia fine powder, alumina micro powder, silicon dioxide micro powder, a composite reinforcing agent and an additive are put into a planetary forced mixer for premixing according to the sequence of the aggregate from large to small for 6min, and are put into a ton bag for standby after being mixed;
s3: adding water into the premix into a wet mixer for stirring, wherein the water adding amount is 5-6% of the weight of the material, the mixing and grinding time is 2min, fully stirring the castable, discharging after good fluidity is obtained, putting the castable into a special die, and vibrating the castable by using a vibrating platform or a vibrating rod to enable the surface of the castable to be smooth and no bubbles to be generated;
s4: after on-site molding, naturally curing for 48 hours, and then on-site baking operation can be performed; after molding in a mold, naturally curing for 24 hours at 25 ℃, demolding and curing, wherein the natural curing time is 72 hours, and baking in a kiln after curing is finished, wherein the baking maximum temperature is 350 ℃.
(1) The castable uses MgO-SiO 2 -H 2 O is used as a combination system, and the ore phases generated in the system mainly comprise a corundum phase, a spinel phase, an olivine phase and a mullite phase, so that the refractoriness of the castable is up to 1700 ℃; on the other hand, since these several ores have excellent resistance against flushing of metallurgical slag and molten steel, the castable is made to have excellent service properties at high temperatures.
(2) The casting material optimizes the production process during production, and for the composite reinforcing agent with the reinforcing effect, the ball milling vibration mode is adopted for premixing, after the composite reinforcing agent is added into the casting material, the hydration of magnesia fine powder and silica micropowder in the casting material is promoted, more magnesia silica gel substances are generated, and therefore the compressive strength of the casting material after baking is greatly improved, and the strength of the casting material after baking in a workshop can reach more than 100 Mpa.
(3) The castable can generate very high strength during baking, and when sodium tripolyphosphate and sodium hexametaphosphate are used as composite dispersing agents, the outward exhaust channel of the castable during baking is increased, and then the castable is matched with the addition of organic fibers, so that the exhaust performance of the castable during baking is greatly improved, and the castable avoids the problem that a traditional cement bonding system is easy to burst during baking.
(4) The aluminum-magnesium castable adopting the magnesia, the silica powder and the water as a combined system is suitable for mass production, and is very high in normal temperature strength after baking due to small influence of air temperature, humidity and baking system, so that the rejection rate is almost zero in the process of product molding and baking, and the manufacturing cost of the product can be greatly reduced.
The castable provided by the invention has the advantages of low cost, high strength, high temperature resistance, corrosion resistance, strong scouring resistance and the like, the refractoriness is more than or equal to 1700 ℃, the chemical index Al2O3+MgO is more than or equal to 83%, the volume density and the compressive strength after being baked at 350 ℃ for 3 hours are respectively more than or equal to 2.9g/cm < 3 > and more than or equal to 100Mpa, and the compressive strength and the line change of heat preservation at 1550 ℃ for 3 hours are respectively more than or equal to 80Mpa and 0.5-2.5%.
Description of the embodiments
A preparation method of a novel high-temperature-resistant high-strength aluminum-magnesium castable comprises the following components in parts by weight:
high aluminum aggregate with granularity of 20-0.15 mm: 65-70%;
corundum fine powder with granularity less than 0.075 mm: 7-12%;
magnesite fine powder with particle size less than 0.075 mm: 8-13%;
calcined alumina micropowder with particle size D50 less than 3 um: 2-6%;
silica micropowder D50 is less than or equal to 2um: 2-5%;
composite reinforcing agent: 2-4%;
dispersing agent and explosion-proof agent: 0.5-1%;
the sum of the mass percentages of the components is 100 percent.
Wherein, the castable composition comprises: 70% of high-alumina aggregate, wherein the maximum grain diameter of the aggregate is 20mm, and the minimum grain diameter of the aggregate is 0.15mm;8% of sintered corundum or fused corundum fine powder, and the grain size is less than or equal to 0.075mm;13% of magnesia fine powder with the grain diameter less than or equal to 0.075mm;4% of calcined alumina micropowder with the particle diameter D50 being less than or equal to 3um;3% of a composite reinforcing agent; 4% of silicon dioxide micropowder with the particle diameter D50 being less than or equal to 2um;0.2% of a complex dispersant; 0.15% of explosion-proof organic fiber.
Wherein, the castable material index includes: al of high-alumina aggregate 2 O 3 ≥83%，Fe 2 O 3 Less than or equal to 1.5 percent, and the volume density of aggregate is more than or equal to 2.85g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the Al of corundum fine powder 2 O 3 More than or equal to 99 percent, sintered corundum or fused corundum; mgO of the magnesia fine powder is more than or equal to 97 percent, and the magnesia fine powder can be fused magnesia and sintered magnesia; the alumina micropowder is calcined alumina micropowder, al 2 O 3 The content is more than or equal to 99 percent, and D50 is less than or equal to 3um; siO of silicon micropowder 2 More than or equal to 96%, wherein the PH requirement is 9-10, and the flow value after water addition is 9-10 mm; the composite reinforcing agent is prepared by co-grinding fused magnesia micro powder and silica micro powder in a ratio of 6:1 with the addition of a phosphate additive in a ball mill; the dispersing agent is formed by compounding sodium tripolyphosphate and sodium hexametaphosphate according to the proportion of 1:1 or 2:1; the organic fiber is an organic explosion-proof fiber with a melting point of about 100 ℃.
Wherein, the steps of the castable preparation include:
s1: preparing a composite reinforcing agent, namely using fused magnesia fine powder and silica micropowder as the composite reinforcing agent, adding an organic reinforcing agent, mixing in a vibration ball mill for 20-30 min, discharging, and quantitatively bagging for later use;
s2: according to the scheme weight ratio, high-alumina aggregate, corundum fine powder, magnesia fine powder, alumina micro powder, silicon dioxide micro powder, a composite reinforcing agent and an additive are put into a planetary forced mixer for premixing according to the sequence of the aggregate from large to small for 6min, and are put into a ton bag for standby after being mixed;
s3: adding water into the premix into a wet mixer for stirring, wherein the water adding amount is 5-6% of the weight of the material, the mixing and grinding time is 2min, fully stirring the castable, discharging after good fluidity is obtained, putting the castable into a special die, and vibrating the castable by using a vibrating platform or a vibrating rod to enable the surface of the castable to be smooth and no bubbles to be generated;
s4: after on-site molding, naturally curing for 48 hours, and then on-site baking operation can be performed; after molding in a mold, naturally curing for 24 hours at 25 ℃, demolding and curing, wherein the natural curing time is 72 hours, and baking in a kiln after curing is finished, wherein the baking maximum temperature is 350 ℃.
Wherein, the aggregate uses Al 2 O 3 The content is more than or equal to 83 percent, fe 2 O 3 The high-alumina aggregate with the content less than or equal to 1.5 percent can be bauxite aggregate, also can be various recovered corundum and high-alumina aggregate, and has the volume density more than or equal to 2.90g/cm 3 The size range of the aggregate is 20-0.15 mm;
wherein, the corundum fine powder Al 2 O 3 More than or equal to 99 percent, and the volume density is more than or equal to 3.4g/cm 3 Particle size is less than or equal to 0.075mm;
wherein MgO of the magnesia fine powder is more than or equal to 97%, and the volume density is more than or equal to 3.3g/cm 3 Particle size is less than or equal to 0.075mm;
wherein the alumina micropowder is sintered alumina micropowder Al 2 O 3 ≥99%，D50≥3um；
Wherein the silicon micropowder, siO 2 The content is more than or equal to 94%, the PH is 9-10, the flow value after adding water is 9-10 mm, and the particle size D50 is less than or equal to 2um;
wherein the composite reinforcing agent is prepared by premixing magnesia micro powder, silica micro powder and reinforcing agent in a vibration ball mill according to a certain proportion, and the proportion of magnesia to silica is 6:1;
wherein, the dispersant is mixed and added by the ratio of tripolyphosphate and sodium hexametaphosphate in 1:1 or 2:1, and the total addition amount is not more than 0.2 percent.
The aluminum-magnesium castable combined by aluminate cement comprises the following materials: the aggregate with the diameter of 20-0.15 mm consists of high-quality 85 alumina aggregate, and the proportion is 70%; the magnesia fine powder accounts for 6 percent; alumina micropowder accounts for 8 percent; the corundum fine powder accounts for 10 percent; aluminate cement accounting for 4 percent; the water reducer accounts for 0.2 percent, and the water reducer is added by compounding sodium tripolyphosphate and sodium hexametaphosphate according to the adding amount of 1:1.
Sequentially adding the raw materials into a planetary mixer from large to small, premixing for 6min, discharging and bagging for later use. And (3) placing the mixed castable into a wet mill, adding 6% -6.5% of water, mixing and grinding for 2min, and pouring the castable onto a working layer lining of a metallurgical container or into a fixed die after the castable has good fluidity.
The detection indexes of the cement bond-aluminum magnesium castable prepared in the example are as follows: volume density and compressive strength at 110 ℃ for 24h are 2.80g/cm respectively 3 And 45MPa; the compressive strength and the line change after firing at 1550 ℃ are 120MP and-0.5-1%, respectively, and the spinel phase and the mullite phase generated at high temperature are relatively less, so that the erosion resistance, the scouring resistance and the thermal shock stability are relatively poor, and the phenomenon of perforation of the slag line part of the retaining wall can occur when the produced tundish slag blocking wall can only be used for 8 hours in a certain steel mill. In addition, the manufactured preform cannot be transported over long distances because of its low room temperature strength.
Examples
The preparation method of the novel high-temperature-resistant high-strength aluminum-magnesium castable comprises the following steps of: 20-0.15 mm aggregate is prepared from Al 2 O 3 High-alumina aggregate with the content of more than or equal to 83 percent and accounting for 70 percent; the ratio of the fused corundum fine powder with the grain diameter of 0.075mm is 7%; 97 electric smelting magnesia fine powder with the grain diameter of 0.075mm accounts for 13 percent; the silicon micropowder accounts for 3 percent; the composite reinforcing binding agent accounts for 2 percent; 4% of calcined alumina micropowder; the total content of the sodium tripolyphosphate and the sodium hexametaphosphate is 0.2 percent, and the adding ratio is 1:1; the rest consists of explosion-proof fiber and stainless steel fiber.
Sequentially adding aggregate, fine powder and additive into a planetary mixer from large to small, premixing for 6min, discharging, and packaging. Putting the premix into a wet mill, adding purified water to stir, wherein the water adding amount is 6%, the stirring time is not less than 2min, discharging after good fluidity is obtained by pouring, putting the discharged premix into a special die, and adopting a vibration molding mode to enable the surface of the castable to be smooth and no bubbles to be generated. In the environment of 25 ℃, the mold can be removed from the mold after 24 hours of curing, and the mold can be naturally cured for 72 hours after the removal of the mold and then can be put into a kiln for baking, wherein the highest temperature of the baking is 350 ℃, and the finished product can be transported to the site for assembly and use after the baking is finished.
The performance indexes of the novel high-temperature-resistant high-strength aluminum-magnesium castable prepared by the example are as follows: the volume density and the compressive strength after 10h at 350 ℃ are 2.85g/cm respectively 3 And is more than or equal to 100MPa; the compressive strength and the linear expansion rate after 1550 ℃ for 3 hours are respectively more than or equal to 50MPa and 0.5-2.5%, and the sample strip is subjected to micro-expansion after firing. The tundish slag blocking wall manufactured by the castable is used in tundish pilot tests of the same steel mill, can be used for 16 hours, has slag line erosion of about 10-30 mm, and has performance improved by times compared with cement-combined retaining wall castable.
Examples
The preparation method of the novel high-temperature-resistant high-strength aluminum-magnesium castable comprises the following steps: 20-0.15 mm aggregate is prepared from Al 2 O 3 The high aluminum particles with the content of more than or equal to 83 percent are mixed with corundum particles, and the proportion of the high aluminum particles is 65 percent; the addition of the fused corundum fine powder with the grain diameter less than or equal to 0.075mm is 12 percent; the magnesia consists of two particles, wherein the addition amount of aggregate with the particle size of 1-0.15 mm is 5%, and the addition amount of magnesia fine powder with the particle size of less than or equal to 0.075mm is 8%; the addition amount of calcined alumina micropowder with D50 less than or equal to 3um is 4 percent; the addition amount of the silicon micropowder is 3%; the addition amount of the composite reinforcing agent is 2%; the ratio of the sodium tripolyphosphate to the sodium hexametaphosphate is 0.2 percent, and the addition ratio is 1:1; the rest consists of explosion-proof fiber and stainless steel fiber.
Sequentially adding aggregate, fine powder and additive into a planetary mixer from large to small, premixing for 6min, discharging, and packaging. Putting the premix into a wet mill, adding purified water to stir, wherein the water adding amount is 4.8%, and the stirring time is not less than 2min, discharging after good fluidity is obtained by pouring, putting the discharged premix into a special die, and adopting a vibration molding mode to enable the surface of the castable to be smooth and no bubbles to be generated. In the environment of 25 ℃, the mold can be removed from the mold after 24 hours of curing, and the mold can be naturally cured for 72 hours after the removal of the mold and then can be put into a kiln for baking, wherein the highest temperature of the baking is 350 ℃, and the finished product can be transported to the site for assembly and use after the baking is finished.
The performance indexes of the novel high-temperature-resistant high-strength aluminum-magnesium castable prepared by the example are as follows: the volume density and the compressive strength after 10 hours at 350 ℃ are respectively more than or equal to 2.95g/cm 3 And is more than or equal to 100MPa; the compressive strength and the linear expansion rate after 1550 ℃ for 3 hours are respectively more than or equal to 70MPa and 0.5-1.5%, and the sample strip is slightly expanded after firing. The tundish slag blocking wall manufactured by the castable can be used for 24 hours on a T-shaped tundish, and slag lines are immersedThe corrosion is about 30-40 mm, and the performance is obviously improved compared with the retaining wall casting material in the example 1.
Examples
The preparation method of the novel high-temperature-resistant high-strength aluminum-magnesium castable comprises the following components: 20-0.15 mm aggregate is prepared from Al 2 O 3 High-alumina aggregate accounting for 70 percent and more than or equal to 83 percent; the ratio of the fused corundum fine powder with the granularity less than or equal to 0.075mm is 7 percent; the ratio of the fused magnesia fine powder with the grain diameter less than or equal to 0.075mm is 11 percent; the silicon micropowder accounts for 3 percent; the calcined alumina micropowder with D50 less than or equal to 3um accounts for 4 percent; the addition amount of the composite reinforcing agent is 2%; 97SiC with the grain diameter less than or equal to 0.075mm is added in an amount of 2 percent; the total ratio of the sodium tripolyphosphate to the sodium hexametaphosphate is 0.2 percent, and the adding ratio is 1:1; the remainder consists of organic fibers and stainless steel fibers.
Sequentially adding aggregate, fine powder and additive into a planetary mixer from large to small, premixing for 6min, discharging, and packaging. Putting the premix into a wet mill, adding purified water to stir, wherein the water adding amount is 6%, the stirring time is not less than 2min, discharging after good fluidity is obtained by pouring, putting the discharged premix into a special die, and adopting a vibration molding mode to enable the surface of the castable to be smooth and no bubbles to be generated. In the environment of 25 ℃, the mold can be removed from the mold after 24 hours of curing, and the mold can be naturally cured for 72 hours after the removal of the mold and then can be put into a kiln for baking, wherein the highest temperature of the baking is 350 ℃, and the finished product can be transported to the site for assembly and use after the baking is finished.
The performance indexes of the novel high-temperature-resistant high-strength aluminum-magnesium castable prepared by the example are as follows: the volume density and the compressive strength after 10 hours at 350 ℃ are respectively more than or equal to 2.85g/cm 3 And is more than or equal to 100MPa; the compressive strength and the linear expansion rate after 1550 ℃ for 3 hours are respectively more than or equal to 80MPa and 0.5-1.5%, and the sample strip is subjected to micro-expansion after firing. The tundish slag blocking wall manufactured by the castable can be used for 24 hours on a T-shaped tundish, slag line erosion is about 40-50 mm, and the performance is obviously improved compared with that of the retaining wall castable of example 1.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and improvements can be made by those skilled in the art without departing from the spirit of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent.
Claims (6)
1. The novel high-temperature-resistant high-strength aluminum-magnesium castable is characterized by comprising the following components in percentage by weight:
high aluminum aggregate with granularity more than 0.15 mm: 60-75%;
corundum fine powder with granularity less than 0.075mm is used in proportion: 7-12%;
magnesite fine powder with granularity less than 0.075 mm: 8-15%;
alumina micropowder with granularity less than 3 um: 2-6%;
the ratio of the silicon dioxide micro powder is as follows: 2-5%;
the ratio of the composite reinforcing agent is as follows: 2-6%;
the ratio of the dispersant to the explosion-proof agent is: 0.5-1%;
the sum of the mass percentages of the components is 100 percent.
2. The novel high-temperature-resistant high-strength aluminum-magnesium castable according to claim 1, wherein the castable component proportion comprises:
aggregate with granularity of 0.15-25 mm of high-aluminum aggregate accounts for the following ratio: 70% of the total weight of the steel sheet;
corundum fine powder with particle size less than or equal to 0.075mm accounts for the following proportion: 7%;
the ratio of the magnesite fine powder with the grain diameter less than or equal to 0.075 mm: 13%;
silica micropowder ratio: 4%;
the ratio of the composite reinforcing agent is as follows: 5%;
the ratio of the dispersant to the explosion-proof agent is: 1%.
3. The novel high-temperature-resistant high-strength aluminum-magnesium castable according to claim 2, wherein the castable combination system uses a magnesium, silicon and water combination system to replace a traditional cement combination system and a hydrated alumina combination system, and the compressive strength of the castable combination system after being subjected to average baking for 10 hours at 350 ℃ is more than or equal to 100MPa under the action of a composite reinforcing agent, and the castable combination system is far greater than that of a traditional castable with low cement combination.
4. The novel high temperature resistant, high strength aluminum magnesium castable according to claim 3, wherein the main raw material materialization of the castable comprises:
al of high-alumina aggregate 2 O 3 ≥83%，Fe 2 O 3 Less than or equal to 1.5 percent, and the volume density is more than or equal to 3.1g/cm 3 ；
The corundum fine powder is sintered corundum or white steel, al thereof 2 O 3 ≥99%；
The magnesia fine powder is fused magnesia or sintered magnesia, and MgO of the magnesia is more than or equal to 97 percent;
the content of the silicon dioxide micropowder requires SiO 2 More than or equal to 94%, the PH is required to be 8-10, the flowing value after water is added is 9-10 mm, and the D50 is less than or equal to 2um.
5. The novel high-temperature-resistant high-strength aluminum-magnesium castable according to claim 4, wherein the composite reinforcing agent is magnesia fine powder and SiO 2 The micro powder and the additive are fully mixed in a vibration ball mill according to a certain proportion to obtain an enhanced premix;
the dispersing agent is compounded by adopting sodium hexametaphosphate and sodium tripolyphosphate, and the proportion is configured according to 2:1/1:1.
6. The novel high temperature resistant, high strength aluminum magnesium castable according to claim 5, wherein the castable preparation step comprises:
s1: preparing a composite reinforcing agent, namely premixing magnesia micro powder, silica micro powder and an additive in a ball mill vibrator according to a set proportion for 20-30 min until the premix meets the proportioning requirement, and filling the mixture into a small woven bag according to the required weight for later use;
s2: the preparation of casting material premix, namely putting weighed high-alumina aggregate, corundum fine powder, magnesia fine powder, alumina fine powder, silica fine powder, a composite reinforcing agent and a dispersing agent into a stirrer for premixing according to the sequence from large to small, scattering organic fibers and stainless steel fibers during the premixing, mixing for 6-8 min, and discharging for later use;
s3: molding the prefabricated part, namely placing the premix into a wet mill, adding water accounting for 5-6% of the weight of the material, mixing and milling for not less than 2min, discharging after the material has good fluidity, placing the mixed castable into a special mold, and performing vibration molding until the surface is flat and no air bubbles are discharged;
s4: curing and baking, namely demolding the formed prefabricated member in a mold-carrying curing environment at 25 ℃ for 24 hours, naturally curing for 72 days after demolding, then putting the molded prefabricated member into a drying kiln for drying, wherein the highest temperature of the drying is 350 ℃, completely removing free water and bound water in the prefabricated member, and obtaining a finished product after baking.
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