CN113666719A - Quick-drying high-strength high-refractoriness under load castable for blast furnace tuyere and preparation method and application thereof - Google Patents
Quick-drying high-strength high-refractoriness under load castable for blast furnace tuyere and preparation method and application thereof Download PDFInfo
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- CN113666719A CN113666719A CN202010402224.0A CN202010402224A CN113666719A CN 113666719 A CN113666719 A CN 113666719A CN 202010402224 A CN202010402224 A CN 202010402224A CN 113666719 A CN113666719 A CN 113666719A
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- castable
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- 238000001035 drying Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims description 4
- 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 37
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 32
- 239000010431 corundum Substances 0.000 claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 29
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000011449 brick Substances 0.000 claims abstract description 15
- 238000010276 construction Methods 0.000 claims abstract description 15
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims abstract description 12
- 229910052581 Si3N4 Inorganic materials 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims abstract description 11
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims abstract description 11
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims abstract description 7
- 239000010959 steel Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 150000004645 aluminates Chemical class 0.000 claims abstract description 6
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 239000011651 chromium Substances 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000009434 installation Methods 0.000 claims abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 230000002950 deficient Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 21
- 230000035939 shock Effects 0.000 abstract description 17
- 230000003628 erosive effect Effects 0.000 abstract description 8
- 239000002131 composite material Substances 0.000 abstract description 5
- 239000007767 bonding agent Substances 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000004806 packaging method and process Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 6
- 230000008439 repair process Effects 0.000 description 4
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 4
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 4
- 235000019832 sodium triphosphate Nutrition 0.000 description 4
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910052863 mullite Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 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 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910001719 melilite Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
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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
- C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
- C04B35/047—Refractories from grain sized mixtures containing chromium oxide or chrome ore
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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
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/74—Ceramic products containing macroscopic reinforcing agents containing shaped metallic materials
- C04B35/76—Fibres, filaments, whiskers, platelets, or the like
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3241—Chromium oxides, chromates, or oxide-forming salts thereof
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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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- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
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- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
Abstract
The invention provides a quick-drying high-strength high-refractoriness under load castable for a blast furnace tuyere, which is prepared from the following raw materials in percentage by mass: 60-72% of at least one particle selected from brown corundum, high-quality alumina and white corundum, 5-10% of silicon carbide, 8-15% of white corundum powder, 5-8% of superfine powder, 0-5% of silicon nitride powder, 0-3% of metal silicon powder, 1-1.5% of steel fiber, 0.5-1% of chromium green, 1.5-2.5% of aluminate cement, 0.1-0.2% of composite water reducing agent and 0.03-0.05% of organic explosion-proof agent. And uniformly mixing the components at normal temperature according to the proportion, and packaging to obtain the quick-drying high-strength high-refractoriness under load castable product. The material is stirred and cast by a stirrer in the blast furnace tuyere area by taking nano silica sol as a bonding agent, and the tuyere residue brick can be maintained and can also be integrally cast. Or made into prefabricated blocks and transported to the site for direct installation. The product has good construction performance, and can be baked and put into use only by short-term maintenance after demoulding. The product has a series of advantages of high refractoriness, high refractoriness under load, high strength, wear resistance, erosion resistance, good thermal shock resistance and the like.
Description
Technical Field
The invention belongs to the technical field of refractory materials and metallurgy, and relates to a quick-drying, high-strength and high-refractoriness under load castable which is mainly applied to a blast furnace tuyere area.
Background
The blast furnace bears the action of high-temperature heat load for a long time due to the severe working environment of the tuyere area, and is prevented from being corroded by iron at about 1500 ℃, and particularly, when the furnace condition is not smooth, and materials are suspended and collapsed frequently, the tuyere is extremely easy to damage. The conventional tuyere composite brick has the main damage mechanism of melting loss, abrasion and damage. When minor repair and intermediate repair are carried out, if the combined bricks are completely dismantled, great waste is generated. Therefore, the casting material is produced and can be used for repairing the damaged tuyere brick or replacing the tuyere combination brick for integral casting.
The corundum-mullite castable has the defects of poor alkali resistance and slag corrosion resistance; upon absorption of alkali metal oxides, melilite and kaliophilite are formed, producing abnormal volume expansion.
The common cement castable has the defects of poor high temperature resistance and thermal shock resistance, and a sample basically cracks completely after about 50 thermal shock cycles. After the low-cement combined castable is molded, the material is relatively compact due to the growth of grains after cement hydration, moisture is difficult to discharge, the material is generally maintained for 2 days after being cured, and the material cannot be baked too fast when being baked, and generally needs to be baked for about 7 days. The cement-free castable is generally low in curing strength, the strength is improved along with the discharge of moisture in the baking process, and after the cement-free castable is generally poured, natural drying is needed for 3 days, and then, the baking time is needed for about 7 days.
The invention starts from two aspects of the material and the bonding agent of the tuyere castable, so that the refractoriness, thermal shock resistance, baking speed and other aspects of the castable achieve satisfactory effects.
Disclosure of Invention
The invention provides a quick-drying high-strength high-refractoriness under load castable for a blast furnace tuyere, which is used for quickly repairing clean slag iron on the surface of a tuyere brick residual brick during minor repair and intermediate repair of a blast furnace, and can also replace a tuyere combined brick to perform integral casting in the tuyere area.
The high-strength high-water-content soft pouring deviceThe injection is compounded with electrically fused corundum (brown corundum or white corundum) or high-quality alumina or silicon carbide as main material, superfine powder and efficient additive and nanometer silica sol as binding agent. Has the main characteristics of easy control of curing time, high strength, good wear resistance, good high temperature resistance, good thermal shock stability, excellent corrosion resistance and no H resistance2And reducing gases such as CO.
The invention provides a quick-drying high-strength high-refractoriness under load castable for a blast furnace tuyere, which is prepared from the following raw materials in percentage by mass:
at least one particle selected from the group consisting of brown fused alumina, high-quality alumina, and white fused alumina: 60-72%;
silicon carbide: 5-10%;
white alundum powder: 8-15%;
ultra-fine powder: 5-8%;
silicon nitride powder: 0 to 5 percent;
metal silicon powder: 0 to 3 percent;
steel fiber: 1-1.5%;
chromium green: 0.5-1%;
aluminate cement: 1.5-2.5%;
compound water reducing agent: 0.1-0.2%;
organic explosion-proof agent: 0.03 to 0.05 percent,
wherein the ultrafine powder contains at least one of a silica fine powder and an alumina fine powder.
Wherein, the brown corundum, the high-quality alumina and the white corundum can be used singly or any two or three of the brown corundum, the high-quality alumina and the white corundum can be used together. The brown corundum comprises 8-5 mm, 5-3 mm, 3-1 mm and 1-0.088 mm, and the mass ratio of the brown corundum to the brown corundum can be 0.7-1.3: 0.7-1.3, preferably 0.75-1.25: 0.75-1.25, and more preferably 1:1:1:1 (approximate ratio).
Wherein one or two of 8-5 mm and 5-3 mm brown fused alumina can be replaced by high-quality alumina with the same granularity, and one or two of 3-1 mm and 1-0.088 mm brown fused alumina can be replaced by white fused alumina with the same granularity; the silicon carbide contains one or two of 1-0.088 mm fine powder and fine powder smaller than 0.088mm, and the fine powder smaller than 0.088mm can be 200 meshes or 325 meshes; the superfine powder contains one or two of silicon dioxide micropowder and alumina micropowder, and is mainly used for ensuring good construction performance. During construction, nano silica sol is used as a bonding agent.
The high-quality alumina is alumina with an alumina content of at least 88%, and specifically, the alumina can be alumina with an alumina content of at least 90%.
The silicon carbide is one or two of silicon carbide particles and silicon carbide powder, and specifically, the silicon carbide particles are larger than or equal to 0.088mm, and the silicon carbide powder is smaller than 0.088 mm.
The white corundum powder may be less than 0.088mm, and specifically may be 325 mesh.
Si of the silicon nitride powder3N4The content is more than 95 percent.
The Si content of the metal silicon powder is more than 95%.
The composite water reducing agent is a water reducing agent commonly used in the art, such as sodium tripolyphosphate, sodium hexametaphosphate, and the like, but is not limited thereto.
The organic explosion-proof agent is those generally used in the art, such as organic fiber, etc., but not limited thereto.
Unless otherwise defined, terms or words in the present invention have the meanings commonly understood and/or used in the art. Also, the words or terms should be understood to have meanings consistent with their meanings in the context and technical spirit of the present invention, based on the principle that the inventor can appropriately define the meanings of the words or terms to best explain the present invention.
The main functions of the components in the quick-drying high-strength high-refractoriness under load castable for the blast furnace tuyere provided by the invention are briefly described as follows:
1) brown corundum, white corundum, high-quality alumina and silicon carbide particles: as aggregate of the castable, the castable has high refractoriness, good erosion resistance and thermal shock resistance.
2) White corundum powder, silicon carbide powder and silicon nitride powder: the castable is used as a main matrix of the castable and has good fire resistance, erosion resistance and thermal shock resistance.
3) Ultra-fine powder: can improve the construction fluidity of the casting material, promote the sintering of the material and improve the performance of the material.
4) Metal silicon powder: during service, the complex atmosphere inside the blast furnace may lead to the formation of carbon deposits in the castable, which silicon may react with to form silicon carbide, strengthening the matrix. The introduction of the metallic silicon can improve the high strength, wear resistance, slag iron resistance and alkali metal corrosion resistance of the tuyere castable.
5) Steel fiber: the integrity and the durability of the construction body can be improved by adding a proper amount of the composite material.
6) Chromium green: and a small amount of chromium green is introduced, so that the maintenance strength of the castable can be improved, crystal lattices can be activated, the sintering of the material can be promoted, and the erosion resistance and thermal shock resistance of the material can be improved.
7) Aluminate cement: mainly acts as a curing agent, and the curing speed of the sample can be controlled by changing the content of the curing agent, and the curing agent can be hydrated to provide initial curing strength.
8) The nano silica sol binder: when aluminate cement is hydrated, ion promoting silica sol gel is formed, and finally colloid particles are combined by chemical bonds to form a stable space network structure. Nano SiO2Has extremely high reactivity with Al2O3The micro powder is easy to react, the medium temperature strength is greatly improved, and the thermal shock resistance of the material is further improved through the mullite reaction. Nano SiO2And the silicon nitride can react with the silicon nitride to generate a sialon phase with excellent chemical properties, so that the material properties are further improved.
Meanwhile, the raw materials in the invention act together, so that the technical scheme has excellent technical effects (including easily controlled curing time, high strength, good wear resistance, good high temperature resistance, good thermal shock stability, excellent erosion resistance and no H resistance)2And the influence of reducing gases such as CO).
The invention provides a preparation process of a quick-drying high-strength high-refractoriness under load castable for a blast furnace tuyere, which comprises the following steps: after weighing various materials according to the material proportion, fully mixing the materials in equipment (such as a stirrer) with a stirring function at room temperature (the mixing time can be 3-6 minutes), discharging and packaging to obtain the product. During on-site construction, a proper amount of nano silica sol solution is used as a bonding agent, and is fully stirred by equipment with a stirring function (such as a stirrer) for use (pouring construction), so that the incomplete tuyere brick can be repaired, and the integral pouring can also be carried out. And can also be made into a tuyere brick precast block which is transported to the site for direct installation.
The invention has the main innovation points and beneficial effects that: 1) because the content of calcium and sodium in the material is low, the liquid phase formed at high temperature is low, and the refractoriness under load of the material is over 1650 ℃; 2) compared with the tuyere combined brick, the integral casting construction of the tuyere combined brick has the advantages of convenient and easy construction, lower cost, effective avoidance of the influence of brick joints and reduction of the risk of gas channeling from the tuyere; 3) by adjusting the addition of the composite water reducing agent and the aluminate cement, the requirement that the quick-drying high-strength high-refractoriness under load castable can obtain ideal construction performance under construction environments in different seasons can be met; 4) after pouring construction and hardening demoulding, the curing is not needed, the baking can be directly carried out, and the efficiency is greatly improved; 5) the material has a series of advantages of high refractoriness, high refractoriness under load, high strength, wear resistance, erosion resistance, good thermal shock resistance and the like, and can be used on large and medium blast furnace tuyeres.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative only and not limiting.
Example 1
The raw materials are proportioned as follows: 8-5 mm 14% of 90 alumina, 5-3 mm 19% of 95 brown corundum, 3-1 mm 20% of 95 brown corundum, 1-0.088 mm 12% of white corundum, 1-0.088 mm 5% of 97 silicon carbide, 9.5% of white corundum 325 meshes, 5% of 97 silicon carbide 200 meshes, 5% of alpha-alumina micropowder, 2% of 96 silica fume, 3% of silicon nitride powder, 2% of 98 metal silicon powder, 2% of CA71 cement, 1% of steel fiber, 0.5% of chrome green, 0.1% of sodium tripolyphosphate, 0.05% of sodium hexametaphosphate and 0.04% of organic fiber.
The sample combined by the silica sol according to the proportion basically has no cracks after 100 thermal shock cycles under the water cooling condition of 1100 ℃, and the sample block after thermal shock is dried for 24 hours at 110 ℃, so that the compressive strength of the sample block exceeds 110MPa, and the strength retention rate is about 90 percent.
The high-strength high-refractoriness under load castable is in a certain range of 1080m3The tuyere area of the blast furnace is used, no damage sign is found after three years of service, the construction body is completely intact, and the estimated service life can easily exceed more than 6 years.
Example 2
The raw materials are proportioned as follows: 8-5 mm 16% of 90 alumina, 5-3 mm 20% of 90 alumina, 3-1 mm 20% of brown corundum, 1-0.088 mm 16% of brown corundum, 325-mesh 12% of white corundum, 200-mesh 6% of 97 silicon carbide, 6% of alpha-alumina micropowder, 2.5% of CA71 cement, 1% of steel fiber, 0.5% of chrome green, 0.075% of sodium tripolyphosphate, 0.075% of sodium hexametaphosphate and 0.05% of organic fiber.
According to the formula, silicon nitride and metal silicon powder are not introduced, silica sol is still combined, the formula is equivalent to a quick-drying high-strength corundum castable, and after 100 times of thermal shock on a sample according to the test conditions of example 1, the compressive strength retention rate is over 85%. It also has the advantages of high refractoriness, high soft-load temperature, high strength, wear resistance, thermal shock resistance and better erosion resistance, but the comprehensive performance is slightly lower than that of the embodiment 1.
Example 3
The raw materials are mixed as follows: 8-5 mm 15% of 90 alumina, 5-3 mm 18% of 90 alumina, 3-1 mm 18% of white corundum, 1-0.088 mm 12% of white corundum, 1-0.088 mm 5% of 97 silicon carbide, 325-mesh 14% of white corundum, 6% of alpha-alumina micropowder, 5% of silicon nitride powder, 3% of metal silicon powder, 1.5% of CA71 cement, 1.5% of steel fiber, 1% of chrome green, 0.1% of sodium tripolyphosphate, 0.1% of sodium hexametaphosphate and 0.03% of organic fiber.
According to the formula, the addition of silicon nitride and metal silicon powder is increased, the silica sol is still bonded, and the compressive strength retention rate of a sample is over 85% after 100 times of thermal shock according to the test conditions of example 1. It is expected that the combination of refractoriness, softening temperature, wear resistance, thermal shock resistance and erosion resistance may be comparable to or even slightly better than example 1.
Claims (8)
1. A quick-drying high-strength high-refractoriness under load castable for a blast furnace tuyere is composed of the following raw materials by mass percent:
at least one particle selected from the group consisting of brown fused alumina, high-quality alumina, and white fused alumina: 60-72%;
silicon carbide: 5-10%;
white alundum powder: 8-15%;
ultra-fine powder: 5-8%;
silicon nitride powder: 0 to 5 percent;
metal silicon powder: 0 to 3 percent;
steel fiber: 1-1.5%;
chromium green: 0.5-1%;
aluminate cement: 1.5-2.5%;
compound water reducing agent: 0.1-0.2%;
organic explosion-proof agent: 0.03 to 0.05 percent,
wherein the ultrafine powder contains at least one of a silica fine powder and an alumina fine powder.
2. The quick-drying high-strength high-refractoriness under load castable for the blast furnace tuyere according to claim 1, wherein the brown corundum comprises 8-5 mm, 5-3 mm, 3-1 mm and 1-0.088 mm in a mass ratio of 0.7-1.3: 0.7-1.3.
3. The quick-drying high-strength high-refractoriness under load castable according to claim 2, wherein at least one of 8-5 mm and 5-3 mm brown alumina is replaced by high-quality alumina with the same grain size.
4. The quick-drying high-strength high-refractoriness under load castable according to claim 2 or 3, wherein at least one of brown corundum of 3-1 mm and 1-0.088 mm is replaced by white corundum of the same grain size.
5. The quick-drying high-strength high-refractoriness under load castable for the blast furnace tuyere according to claim 1, wherein the silicon carbide comprises at least one of 1-0.088 mm and fine powder smaller than 0.088 mm.
6. A preparation method of a quick-drying high-strength high-refractoriness under load castable for a blast furnace tuyere is characterized in that the quick-drying high-strength high-refractoriness under load castable for the blast furnace tuyere is obtained by mixing the raw materials according to any one of claims 1 to 5, fully mixing in a stirring device and discharging.
7. An application method of the quick-drying high-strength high-refractoriness under load for a blast furnace tuyere is characterized in that during site construction, a proper amount of nano silica sol solution is used as a binding agent, and the quick-drying high-strength high-refractoriness under load castable prepared in the method in claim 6 is fully stirred by a stirring device and then used.
8. The application method of the quick-drying high-strength high-refractoriness under load castable for the blast furnace tuyere according to claim 7, wherein the quick-drying high-strength high-refractoriness under load castable for the blast furnace tuyere is used for repairing a deficient tuyere brick; or integral casting, after casting construction, hardening and demoulding, short-term curing, baking and putting into use; or the tuyere brick precast block is manufactured and transported to the site for direct installation.
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