CN109503134B - Steel ladle castable and preparation method thereof - Google Patents
Steel ladle castable and preparation method thereof Download PDFInfo
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- CN109503134B CN109503134B CN201811645440.7A CN201811645440A CN109503134B CN 109503134 B CN109503134 B CN 109503134B CN 201811645440 A CN201811645440 A CN 201811645440A CN 109503134 B CN109503134 B CN 109503134B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 title description 3
- 239000010959 steel Substances 0.000 title description 3
- 239000000843 powder Substances 0.000 claims abstract description 80
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 68
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 63
- 239000011029 spinel Substances 0.000 claims abstract description 63
- 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 55
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 39
- 239000010431 corundum Substances 0.000 claims abstract description 39
- 239000002994 raw material Substances 0.000 claims abstract description 38
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 37
- 239000000463 material Substances 0.000 claims abstract description 35
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 27
- 239000010703 silicon Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000000654 additive Substances 0.000 claims description 18
- 230000000996 additive effect Effects 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 9
- 239000011777 magnesium Substances 0.000 claims description 8
- 229910052749 magnesium Inorganic materials 0.000 claims description 8
- -1 magnesium aluminate Chemical class 0.000 claims description 8
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 8
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 6
- 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 6
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 4
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 4
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 4
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 4
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000292 calcium oxide Substances 0.000 claims description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 2
- 239000001095 magnesium carbonate Substances 0.000 claims description 2
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 2
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 claims description 2
- 229910001950 potassium oxide Inorganic materials 0.000 claims description 2
- 238000009991 scouring Methods 0.000 abstract description 6
- 239000011819 refractory material Substances 0.000 abstract description 2
- 230000003628 erosive effect Effects 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 8
- 238000011049 filling Methods 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 238000000465 moulding Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009847 ladle furnace Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B35/803—
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—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
- C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3272—Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
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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
- C04B2235/34—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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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Ceramic Products (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Catalysts (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The invention relates to the field of refractory materials, and particularly relates to a ladle castable and a preparation method thereof. A ladle castable is prepared from multiple raw materials in parts by weight: 20-60 parts of 90 homogenized material, 25-55 parts of white corundum, 3-5 parts of sintered magnesia, 4-6 parts of sintered magnesia-alumina spinel, 6-10 parts of active magnesia-alumina spinel micro powder and 2-4 parts of silicon micro powder. The ladle castable has low cost, excellent high-temperature performance, excellent anti-scouring performance and excellent anti-erosion performance, and has longer service life. The preparation method of the ladle castable can be used for preparing the ladle castable with low cost and excellent high-temperature performance.
Description
Technical Field
The invention relates to the field of refractory materials, and particularly relates to a ladle castable and a preparation method thereof.
Background
The castable is also called as refractory castable, has high fluidity and wide application range in the metallurgical production process, can be used as a lining body, can be made into a precast block for use, and can be used for a ladle of an LF (ladle furnace).
In order to make the performance of the castable reach the standard, a large amount of high-quality corundum materials such as white corundum, tabular corundum and compact corundum are used in the preparation components of the traditional castable, although the high-temperature performance, the erosion resistance and the service life of the traditional castable are all excellent, the use amount of the castable is gradually increased along with the increase of the metallurgical production scale, the cost of the high-quality corundum is higher, and the high-quality corundum does not meet the policy of cost reduction and efficiency improvement, so that the development of the castable is urgently needed, and the high-temperature performance, the erosion resistance and the service life of the castable can still meet the production requirements while the low-cost raw materials are used.
The present application is made in view of this feature.
Disclosure of Invention
The invention aims to provide a ladle castable which is low in cost, excellent in high-temperature performance, scouring resistance and erosion resistance and long in service life.
Another object of the present invention is to provide a method for preparing the above ladle castable, by which a ladle castable having low cost and excellent high temperature performance can be prepared.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the invention provides a ladle castable which is prepared from multiple raw materials in parts by weight: 20-60 parts of 90 homogenized material, 25-55 parts of white corundum, 3-5 parts of sintered magnesia, 4-6 parts of sintered magnesia-alumina spinel, 6-10 parts of active magnesia-alumina spinel micro powder and 2-4 parts of silicon micro powder.
The invention provides a preparation method of a ladle castable, which comprises the following steps:
uniformly premixing the sintered magnesia, the sintered magnesia-alumina spinel, the active magnesia-alumina spinel micro powder and the silicon micro powder to obtain premixed powder;
putting the 90 homogenized material, the white corundum and the premixed powder into a stirrer, adding water, stirring uniformly, curing and demoulding;
and (5) demolding and baking.
The ladle castable and the preparation method thereof have the beneficial effects that:
according to the ladle castable disclosed by the embodiment of the invention, the 90 homogenizing material, the white corundum, the sintered magnesia, the sintered magnesium-aluminum spinel, the active magnesium-aluminum spinel micro powder and the silicon micro powder are mutually cooperated and synergized, so that the ladle castable can be ensured to have excellent high-temperature performance, scouring resistance and erosion resistance on the premise of effectively reducing the cost by selecting the 90 homogenizing material, has a longer service life, and the performance of the ladle castable is further enhanced by limiting the proportion of the raw materials.
The preparation method of the embodiment of the invention further enhances the high-temperature performance of the ladle castable by limiting the baking mode, the baking temperature and the baking time in the preparation process.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The ladle castable and the preparation method thereof according to the embodiment of the invention are specifically described below.
The ladle castable provided by the embodiment of the invention is prepared from various raw materials, wherein the various raw materials comprise the following components in parts by weight: 20-60 parts of 90 homogenized material, 25-55 parts of white corundum, 3-5 parts of sintered magnesia, 4-6 parts of sintered magnesia-alumina spinel, 6-10 parts of active magnesia-alumina spinel micro powder and 2-4 parts of silicon micro powder.
The raw materials comprise the following components in parts by weight: 22-58 parts of 90 homogenized material, 27-53 parts of white corundum, 3-5 parts of sintered magnesia, 4.5-6 parts of sintered magnesia-alumina spinel, 7-9 parts of active magnesia-alumina spinel micro powder and 2-4 parts of silicon micro powder. Or the plurality of raw materials comprises: 26-55 parts of 90 homogenized material, 29-50 parts of white corundum, 3.5-5 parts of sintered magnesia, 4.5-5.5 parts of sintered magnesia-alumina spinel, 7.5-9 parts of active magnesia-alumina spinel micro powder and 2.5-4 parts of silicon micro powder.
The mutual action of the compatibility of the raw materials can ensure that each raw material can fully play the role, and meanwhile, the components can generate synergistic action or synergism, so that the relevance between the effects of each component is enhanced, the side effect of a specific component is weakened, and then the ladle castable prepared from the raw materials has high temperature performance, anti-scouring performance and anti-erosion performance. For example, the sintered magnesium aluminate spinel can generate a synergistic effect with white corundum, and the corrosion resistance of the ladle castable is further improved. Meanwhile, the ladle castable prepared by adopting the proportion can be ensured to have better high-temperature performance, and each raw material can better play the role, if the proportion is changed, the synergistic effect can be reduced or disappear, and the overall performance of the ladle castable is further influenced.
Specifically, the 90-degree homogenizing material of the embodiment comprises the following components in percentage by mass: more than or equal to 90 percent of aluminum oxide, 0 to 1.8 percent of ferric oxide and 0 to 0.4 percent of the total amount of potassium oxide and sodium oxide. The alumina with the mass fraction of more than or equal to 90 percent can effectively enhance the high-temperature performance and the erosion resistance of the ladle castable. On the other hand, the 90 homogenized material has lower cost compared with high-quality corundum raw materials such as white corundum and the like, so that the 90 homogenized material can play a role in reducing cost.
Specifically, the white corundum according to the present embodiment includes, by mass: more than or equal to 99 percent of aluminum oxide, 0 to 0.1 percent of ferric oxide, 0 to 0.4 percent of sodium oxide and 0 to 0.2 percent of silicon oxide. The white corundum can provide excellent high-temperature performance and erosion resistance.
Specifically, the sintered magnesite of the embodiment comprises the following components by mass percent: more than or equal to 95 percent of magnesium oxide, 0 to 1.8 percent of calcium oxide and 0 to 2.0 percent of silicon oxide. The sintered magnesia can provide good high-temperature resistance and excellent erosion resistance for the ladle castable, so that the ladle castable can effectively resist the scouring of high-temperature molten steel.
Specifically, the sintered magnesia-alumina spinel of the embodiment comprises the following components in percentage by mass: the aluminum oxide is more than or equal to 73 percent, the magnesium oxide is more than or equal to 25 percent, and the castable has good erosion resistance, abrasion resistance and thermal shock stability and can greatly improve the erosion resistance of the ladle castable.
Specifically, in the active magnesium aluminate spinel micro powder of the embodiment, by mass percentage, the active magnesium aluminate spinel micro powder comprises the following components: the aluminum oxide is more than or equal to 90 percent, the magnesium oxide is more than or equal to 8 percent, the good erosion resistance, abrasion resistance and thermal shock stability can be provided, the high-temperature performance of the ladle castable is further improved by the synergistic effect of the aluminum oxide, the sintered magnesia-alumina spinel and the sintered magnesia.
Furthermore, the raw materials also comprise 0.2 to 1 part of additive by weight. The additive is used for improving the fluidity of the ladle castable in the preparation process.
Further, the additive is one or two of sodium tripolyphosphate, sodium hexametaphosphate and REFPAC 100. The sodium tripolyphosphate aqueous solution is weakly alkaline and has the effect of forming a suspension in water with the pH value of 7-14, so that the sodium tripolyphosphate aqueous solution has a good dispersing effect so as to improve the fluidity of the ladle castable in the preparation process, and can be used as a water reducing agent to reduce the water adding amount in the preparation process; the sodium hexametaphosphate has good hygroscopicity, can gradually absorb moisture to be in a sticky state, and can also be used as a water reducing agent to play a role in reducing the water adding amount, and on the other hand, the sodium hexametaphosphate also has good dispersing capacity, can generate a soluble complex with metal ions such as calcium and magnesium, and can also improve the fluidity of the ladle castable in the preparation process; the REFPAC100 is a novel additive and can also play a role in improving the fluidity in the preparation process and reducing the water addition amount.
Furthermore, the raw materials also comprise 0.1 to 0.2 weight portion of explosion-proof fiber. The explosion-proof fiber is a fireproof material prepared by taking polypropylene as a raw material, the fireproof material is uniformly mixed with the raw material and then is baked, the explosion-proof fiber starts to soften, shrink and melt along with the continuous rise of baking temperature and reaches a certain temperature, and finally forms pores and carbonizes, and the pores are distributed in the formed ladle castable to form tiny network pores, so that a water-gas channel is opened, the internal stress is reduced, the explosion is prevented, and the service life of the whole ladle castable is prolonged.
The invention also provides a preparation method of the ladle castable, which comprises the following steps: the method comprises the following steps:
s1, premixing;
uniformly premixing the sintered magnesia, the sintered magnesia-alumina spinel, the active magnesia-alumina spinel micro powder and the silicon micro powder to obtain premixed powder.
Specifically, the raw materials are uniformly mixed according to the proportion of 3-5 parts of sintered magnesia, 4-6 parts of sintered magnesia-alumina spinel, 6-10 parts of active magnesia-alumina spinel micro powder and 2-4 parts of silicon micro powder to obtain premixed powder. The steps are to uniformly premix all the powdery raw materials, so as to prevent the performance of the prepared ladle castable from being unstable due to nonuniform mixing.
Preferably, the raw materials are uniformly mixed according to the proportion of 3-5 parts of sintered magnesia, 4.5-6 parts of sintered magnesia-alumina spinel, 7-9 parts of active magnesia-alumina spinel micro powder and 2-4 parts of silicon micro powder to obtain premixed powder.
More preferably, the raw materials are evenly mixed according to the proportion of 3.5 to 5 parts of sintered magnesia, 4.5 to 5.5 parts of sintered magnesia-alumina spinel, 7.5 to 9 parts of active magnesia-alumina spinel micro powder and 2.5 to 4 parts of silicon micro powder to obtain the premixed powder.
Further, the premixing time is 20 to 30 minutes. The sufficient premixing time can ensure the uniformity of premixed powder, and then ensure the performance stability of the ladle castable, on the other hand, the cost is increased due to overlong time, and the cost can be reduced on the premise of ensuring uniformity after 20-30 minutes.
S2, casting, curing and demolding;
and (3) filling the 90 homogenized material, the white corundum and the premixed powder into a stirrer, adding water, stirring uniformly, pouring, curing and demolding.
Specifically, the 90 homogenized material, the white corundum and the premixed powder are put into a stirrer, added with water and stirred uniformly, the mass of the added water is 4-6% of the total mass of the ladle castable, then poured into a mold for molding, naturally cured for 1-3 days, and then demolded.
S3, baking;
and (5) demolding and baking. The ladle castable can be prepared through a baking step.
Further, the baking step comprises low-temperature baking, medium-temperature baking and high-temperature baking, wherein the low-temperature baking temperature is 10-200 ℃, and the time is 40-48 hours; the medium-temperature baking temperature is 201-700 ℃, and the time is 36-48 hours; the high-temperature baking temperature is 701-1000 ℃, and the time is 36-48 hours.
Specifically, the demoulded ladle castable blank is firstly placed under a roaster to be roasted at the low temperature of 10-200 ℃ for 40-48 hours, then the temperature is raised to 201-700 ℃ for medium-temperature roasting for 36-48 hours, and finally the temperature is raised to 701-1000 ℃ for high-temperature roasting for 36-48 hours. After the demoulded ladle castable blank is subjected to the complete baking step, the performance can be effectively improved, so that the demoulded ladle castable blank has more excellent high-temperature performance, erosion resistance and corrosion resistance, and the service life of the demoulded ladle castable blank can be prolonged.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The ladle castable provided by the embodiment of the invention is prepared from various raw materials, wherein the various raw materials comprise the following components in parts by weight: 20 parts of 90 homogenized materials, 55 parts of white corundum, 3 parts of sintered magnesia, 6 parts of sintered magnesia-alumina spinel, 6 parts of active magnesia-alumina spinel micro powder and 4 parts of silicon micro powder, and also comprises 0.2 part of an additive and 0.2 part of explosion-proof fiber, wherein the additive is sodium tripolyphosphate.
The embodiment of the invention also provides a preparation method of the ladle castable, which comprises the following steps: the method comprises the following steps:
s1, premixing;
and uniformly stirring and mixing the sintered magnesia, the sintered magnesia-alumina spinel, the active magnesia-alumina spinel micro powder and the silicon micro powder by using stirring equipment to obtain premixed powder.
S2, casting, curing and demolding;
and (3) filling the 90 homogenized material, the white corundum and the premixed powder into a stirrer, adding water, uniformly stirring, pouring the water with the mass of 4% of the total mass of the ladle castable, pouring the ladle castable into a mold for molding, naturally curing for 3 days, and demolding.
S3, baking;
firstly, placing the demoulded ladle castable blank in a roaster, baking at the low temperature of 200 ℃ for 40 hours, then raising the temperature to 700 ℃, baking at the medium temperature for 36 hours, and finally raising the temperature to 1000 ℃ for baking at the high temperature for 36 hours to obtain the ladle castable.
Example 2
The ladle castable provided by the embodiment of the invention is prepared from various raw materials, wherein the various raw materials comprise the following components in parts by weight: 60 parts of 90 homogenized materials, 25 parts of white corundum, 5 parts of sintered magnesia, 4 parts of sintered magnesia-alumina spinel, 10 parts of active magnesia-alumina spinel micro powder and 2 parts of silicon micro powder, and also comprises 1 part of an additive and 0.1 part of explosion-proof fiber, wherein the additive is REFPAC 100.
The embodiment of the invention also provides a preparation method of the ladle castable, which comprises the following steps: the method comprises the following steps:
s1, premixing;
and uniformly stirring and mixing the sintered magnesia, the sintered magnesia-alumina spinel, the active magnesia-alumina spinel micro powder and the silicon micro powder by using stirring equipment to obtain premixed powder.
S2, casting, curing and demolding;
and (3) filling the 90 homogenized material, the white corundum and the premixed powder into a stirrer, adding water and stirring uniformly, wherein the mass of the added water is 6% of the total mass of the ladle castable, then pouring the ladle castable into a mold for molding, naturally curing for 1 day, and then demolding.
S3, baking;
firstly, placing the demoulded ladle castable blank in a roaster, baking at the low temperature of 10 ℃ for 48 hours, then raising the temperature to 201 ℃, baking at the medium temperature of 48 hours, and finally raising the temperature to 701 ℃, and baking at the high temperature of 48 hours to obtain the ladle castable.
Example 3
The ladle castable provided by the embodiment of the invention is prepared from various raw materials, wherein the various raw materials comprise the following components in parts by weight: 22 parts of 90 homogenized materials, 53 parts of white corundum, 3 parts of sintered magnesia, 6 parts of sintered magnesia-alumina spinel, 7 parts of active magnesia-alumina spinel micro powder and 4 parts of silicon micro powder, and also comprises 0.2 part of additive and 0.2 part of explosion-proof fiber, wherein the additive comprises 0.1 part of sodium hexametaphosphate and 0.1 part of sodium tripolyphosphate.
The embodiment of the invention also provides a preparation method of the ladle castable, which comprises the following steps: the method comprises the following steps:
s1, premixing;
and uniformly stirring and mixing the sintered magnesia, the sintered magnesia-alumina spinel, the active magnesia-alumina spinel micro powder and the silicon micro powder by using stirring equipment to obtain premixed powder.
S2, casting, curing and demolding;
and (3) filling the 90 homogenized material, the white corundum and the premixed powder into a stirrer, adding water, uniformly stirring, pouring the water with the mass of 4% of the total mass of the ladle castable, pouring the ladle castable into a mold for molding, naturally curing for 3 days, and demolding.
S3, baking;
firstly, placing the demoulded ladle castable blank in a roaster, baking at the low temperature of 180 ℃ for 42 hours, then raising the temperature to 640 ℃, baking at the medium temperature of 39 hours, and finally raising the temperature to 930 ℃ and baking at the high temperature for 38 hours to obtain the ladle castable.
Example 4
The ladle castable provided by the embodiment of the invention is prepared from various raw materials, wherein the various raw materials comprise the following components in parts by weight: 55 parts of 90 homogenized material, 29 parts of white corundum, 5 parts of sintered magnesia, 4.5 parts of sintered magnesia-alumina spinel, 9 parts of active magnesia-alumina spinel micro powder and 205 parts of silicon micro powder, and also comprises 1 part of additive and 0.1 part of explosion-proof fiber, wherein the additive is sodium hexametaphosphate.
The embodiment of the invention also provides a preparation method of the ladle castable, which comprises the following steps: the method comprises the following steps:
s1, premixing;
and uniformly stirring and mixing the sintered magnesia, the sintered magnesia-alumina spinel, the active magnesia-alumina spinel micro powder and the silicon micro powder by using stirring equipment to obtain premixed powder.
S2, casting, curing and demolding;
and (3) filling the 90 homogenized material, the white corundum and the premixed powder into a stirrer, adding water and stirring uniformly, wherein the mass of the added water is 6% of the total mass of the ladle castable, then pouring the ladle castable into a mold for molding, naturally curing for 3 days, and then demolding.
S3, baking;
firstly, placing the demoulded ladle castable blank in a roaster, baking at the low temperature of 70 ℃ for 46 hours, then raising the temperature to 520 ℃, baking at the medium temperature for 45 hours, and finally raising the temperature to 860 ℃ and baking at the high temperature for 47 hours to obtain the ladle castable.
Example 5
The ladle castable provided by the embodiment of the invention is prepared from various raw materials, wherein the various raw materials comprise the following components in parts by weight: 41 parts of 90 homogenized material, 39 parts of white corundum, 4 parts of sintered magnesia, 5 parts of sintered magnesia-alumina spinel, 8.5 parts of active magnesia-alumina spinel micro powder and 3.5 parts of silicon micro powder, and also comprises 0.6 part of additive and 0.16 part of explosion-proof fiber, wherein the additive is sodium tripolyphosphate.
The embodiment of the invention also provides a preparation method of the ladle castable, which comprises the following steps: the method comprises the following steps:
s1, premixing;
and uniformly stirring and mixing the sintered magnesia, the sintered magnesia-alumina spinel, the active magnesia-alumina spinel micro powder and the silicon micro powder by using stirring equipment to obtain premixed powder.
S2, film loading, curing and demolding;
and (3) filling the 90 homogenized material, the white corundum and the premixed powder into a stirrer, adding water and stirring uniformly, wherein the mass of the added water is 5% of the total mass of the ladle castable, pouring the mixture into a mold for molding, naturally curing for 2 days, and then demolding.
S3, baking;
firstly, placing the demoulded ladle castable blank in a roaster, baking at a low temperature of 110 ℃ for 44 hours, then raising the temperature to 470 ℃, baking at a medium temperature for 42 hours, finally raising the temperature to 880 ℃, and baking at a high temperature for 43 hours to obtain the ladle castable.
Comparative example 1
The difference from example 1 is that the 90 homogenization batch is replaced by the same portion of white corundum.
Comparative example 2
The difference from example 5 is that the various starting materials include: 70 parts of 90 homogenized material, 16 parts of white corundum, 6 parts of sintered magnesia, 7 parts of sintered magnesia-alumina spinel, 5 parts of active magnesia-alumina spinel micro powder and 5 parts of silicon micro powder, and also comprises 1 part of additive and 0.5 part of explosion-proof fiber, wherein the additive is sodium tripolyphosphate.
Comparative example 3
The difference from example 3 is that the sintered magnesia-alumina spinel is replaced by the same amount of sintered magnesia.
Comparative example 4
The difference from the example 4 is that the active magnesia-alumina spinel micro powder is replaced by the same part of sintered magnesia.
Comparative example 5
The difference from example 5 is that in the baking step, the demolded premixed flour was directly placed in a 900 ℃ baking oven for 129 hours.
Comparative example 6
The difference from example 5 is that in the baking step, the temperature of the low-temperature baking was 300 ℃, the temperature of the medium-temperature baking was 750 ℃, and the temperature of the high-temperature baking was 1100 ℃.
Comparative example 7
The difference from example 5 is that in the baking step, the low-temperature baking time was 30 hours, the medium-temperature baking time was 55 hours, and the high-temperature baking time was 25 hours.
Experimental example 1
The ladle castable materials of the examples 1-5 and the comparative examples 1-7 are respectively detected from four aspects of refractoriness, normal-temperature flexural strength (110 ℃, 24 hours), normal-temperature compressive strength (110 ℃, 24 hours) and heating permanent line change according to the experimental methods of YB/T5083-2014, and the service life under normal conditions is respectively tested, and the detection results are shown in Table 1.
TABLE 1 test results
As can be seen from Table 1, the ladle castable provided in the embodiments 1-5 of the present invention can achieve the performance equivalent to that of the white corundum on the premise of using 90 homogenized powder to reduce cost. By limiting the compatibility of the raw materials and the baking method and temperature during preparation, the refractoriness, the normal-temperature breaking strength, the normal-temperature compressive strength, the heating permanent line change and the effective use times of the ladle castable can be effectively enhanced.
In summary, the ladle castable provided by the embodiment of the invention has the advantages that the 90 homogenizing material, the white corundum, the sintered magnesia, the sintered magnesium aluminate spinel, the active magnesium aluminate spinel micro powder and the silicon micro powder are mutually cooperated and synergized, so that the ladle castable can be ensured to have excellent high-temperature performance, scouring resistance and erosion resistance on the premise of effectively reducing the cost by the 90 homogenizing material, and has longer service life, and the performance of the ladle castable is further enhanced by limiting the proportion of the raw materials; the preparation method of the ladle castable further enhances the high-temperature performance of the ladle castable by limiting the baking mode, the baking temperature and the baking time in the preparation process.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (10)
1. The ladle castable is characterized by being prepared from multiple raw materials in parts by weight: 20-60 parts of 90 homogenized material, 25-55 parts of white corundum, 3-5 parts of sintered magnesia, 4-6 parts of sintered magnesia-alumina spinel, 6-10 parts of active magnesia-alumina spinel micro powder and 2-4 parts of silicon micro powder;
the 90 homogenized material comprises the following components: more than or equal to 90 percent of aluminum oxide, 0 to 1.8 percent of ferric oxide and 0 to 0.4 percent of the total amount of potassium oxide and sodium oxide;
the white corundum comprises the following components: more than or equal to 99 percent of aluminum oxide, 0 to 0.1 percent of ferric oxide, 0 to 0.4 percent of sodium oxide and 0 to 0.2 percent of silicon oxide;
the sintered magnesite comprises the following components: more than or equal to 95 percent of magnesium oxide, 0 to 1.8 percent of calcium oxide and 0 to 2.0 percent of silicon oxide;
the sintered magnesium aluminate spinel comprises the following components: the content of aluminum oxide is more than or equal to 73 percent, and the content of magnesium oxide is more than or equal to 25 percent;
the active magnesium aluminate spinel micro powder comprises the following components: the aluminum oxide is more than or equal to 90 percent, and the magnesium oxide is more than or equal to 8 percent.
2. The ladle castable according to claim 1, wherein the plurality of raw materials comprises, in parts by weight: 22-58 parts of the 90-part homogenizing material, 27-53 parts of white corundum, 3-5 parts of sintered magnesia, 4.5-6 parts of sintered magnesia-alumina spinel, 7-9 parts of active magnesia-alumina spinel micro powder and 2-4 parts of silicon micro powder.
3. The ladle castable according to claim 1, wherein the plurality of raw materials comprises, in parts by weight: 26-55 parts of the 90-part homogenizing material, 29-50 parts of white corundum, 3.5-5 parts of sintered magnesia, 4.5-5.5 parts of sintered magnesia-alumina spinel, 7.5-9 parts of active magnesia-alumina spinel micro powder and 2.5-4 parts of silicon micro powder.
4. The ladle castable according to any one of claims 1 to 3, wherein the raw material further comprises 0.2 to 1 part by weight of an additive.
5. The ladle castable according to claim 4, wherein the additive is one or a combination of two of sodium tripolyphosphate, sodium hexametaphosphate and REFPAC 100.
6. The ladle castable according to any one of claims 1 to 3, wherein the raw material further comprises 0.1 to 0.2 parts by weight of an explosion-proof fiber.
7. A method of preparing a ladle castable according to any one of claims 1 to 3, comprising the steps of:
uniformly premixing the sintered magnesia, the sintered magnesia-alumina spinel, the active magnesia-alumina spinel micro powder and the silicon micro powder to obtain premixed powder;
putting the 90 homogenized material, the white corundum and the premixed powder into a stirrer, adding water, stirring uniformly, pouring, curing and demoulding;
and (5) demolding and baking.
8. The method for preparing a ladle castable according to claim 7, wherein in the premixing step, the premixing time is 20-30 minutes.
9. The preparation method of the ladle castable according to claim 7, wherein the mass of added water is 4-6% of the total mass of the ladle castable, and the curing time is 1-3 days.
10. The preparation method of the ladle castable according to claim 7, wherein the baking step comprises low-temperature baking, medium-temperature baking and high-temperature baking, and the low-temperature baking temperature is 10-200 ℃ and the time is 40-48 hours; the medium-temperature baking temperature is 201-700 ℃, and the time is 36-48 hours; the high-temperature baking temperature is 701-1000 ℃, and the time is 36-48 hours.
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| US6313056B1 (en) * | 1998-08-20 | 2001-11-06 | Harbison-Walker Refractories Company | Non-slumping sprayable refractory castables containing thermal black |
| CN101658910A (en) * | 2009-09-20 | 2010-03-03 | 浙江红鹰集团股份有限公司 | Composite slag weir and preparation method thereof |
| CN107814582A (en) * | 2017-11-22 | 2018-03-20 | 河南新拓耐火材料有限公司 | A kind of pouring materialfor steel ladle and its obtained ladle |
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| CN102744394B (en) * | 2012-07-26 | 2014-04-30 | 莱芜钢铁集团有限公司 | Flow control device for tundish of slab continuous caster and deslagging method thereof |
| CN105036773B (en) * | 2015-08-03 | 2020-04-07 | 丹东播磨耐火材料有限公司 | Ladle bottom castable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6313056B1 (en) * | 1998-08-20 | 2001-11-06 | Harbison-Walker Refractories Company | Non-slumping sprayable refractory castables containing thermal black |
| CN101658910A (en) * | 2009-09-20 | 2010-03-03 | 浙江红鹰集团股份有限公司 | Composite slag weir and preparation method thereof |
| CN107814582A (en) * | 2017-11-22 | 2018-03-20 | 河南新拓耐火材料有限公司 | A kind of pouring materialfor steel ladle and its obtained ladle |
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