CN116655395B - Tundish dry material with molten steel cleaning function - Google Patents
Tundish dry material with molten steel cleaning function Download PDFInfo
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- CN116655395B CN116655395B CN202310728392.2A CN202310728392A CN116655395B CN 116655395 B CN116655395 B CN 116655395B CN 202310728392 A CN202310728392 A CN 202310728392A CN 116655395 B CN116655395 B CN 116655395B
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- 239000000463 material Substances 0.000 title claims abstract description 49
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000004140 cleaning Methods 0.000 title claims abstract description 19
- 239000004576 sand Substances 0.000 claims abstract description 53
- 239000011029 spinel Substances 0.000 claims abstract description 49
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 49
- 239000011575 calcium Substances 0.000 claims abstract description 41
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 41
- 239000000843 powder Substances 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 23
- 239000011230 binding agent Substances 0.000 claims abstract description 9
- 238000005245 sintering Methods 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 25
- 239000004927 clay Substances 0.000 claims description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 claims description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 7
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 6
- 239000004327 boric acid Substances 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 229910021538 borax Inorganic materials 0.000 claims description 5
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 5
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 5
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 claims description 5
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 3
- LXXKJGXDEZDJOM-UHFFFAOYSA-N [Fe].[Mg].[Ca] Chemical compound [Fe].[Mg].[Ca] LXXKJGXDEZDJOM-UHFFFAOYSA-N 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 3
- 229910052681 coesite Inorganic materials 0.000 claims 3
- 229910052593 corundum Inorganic materials 0.000 claims 3
- 229910052906 cristobalite Inorganic materials 0.000 claims 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims 3
- 239000000377 silicon dioxide Substances 0.000 claims 3
- 235000012239 silicon dioxide Nutrition 0.000 claims 3
- 229910052682 stishovite Inorganic materials 0.000 claims 3
- 229910052905 tridymite Inorganic materials 0.000 claims 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 7
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 abstract 1
- 238000005260 corrosion Methods 0.000 abstract 1
- 238000005984 hydrogenation reaction Methods 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 22
- 239000007767 bonding agent Substances 0.000 description 14
- 239000000395 magnesium oxide Substances 0.000 description 11
- 238000002156 mixing Methods 0.000 description 10
- 238000005253 cladding Methods 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 7
- 239000000292 calcium oxide Substances 0.000 description 7
- 235000012255 calcium oxide Nutrition 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 239000001257 hydrogen Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000005303 weighing Methods 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 230000001502 supplementing effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002085 irritant Substances 0.000 description 2
- 231100000021 irritant Toxicity 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 230000007306 turnover Effects 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
- C04B35/03—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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- 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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- C04B2235/02—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
- C04B2235/3409—Boron oxide, borates, boric acids, or oxide forming salts thereof, e.g. borax
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- 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
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
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- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
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- Manufacturing & Machinery (AREA)
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Abstract
本发明公开了一种具有洁净钢水功能的中间包干式料，其组成按质量百分数计：粒度为5～3mm的镁钙砂骨料5～15％；粒度为3～1mm的镁钙砂骨料5～15％；粒度小于1mm的镁钙砂骨料3～7％；粒度小于0.075mm的镁钙砂粉15～20％；粒度为5～3mm的尖晶石骨料5～15％；粒度为3～1mm的尖晶石骨料5～15％；粒度小于1mm的尖晶石骨料3～7％；粒度小于0.075mm的尖晶石粉15～20％；促烧剂8～10％；结合剂8～10％；本发明不仅可以避免“增氢”、“增碳”现象的发生，还具有洁净钢水的功能，同时具有抗侵蚀能力强、使用寿命长，施工方便的特点。The invention discloses a tundish dry material with the function of cleaning molten steel. The composition of the tundish dry material is calculated by mass percentage: 5-15% of magnesia-calcium sand aggregate with a particle size of 5-3mm; 5-15% of magnesia-calcium sand aggregate with a particle size of 3-1mm; 3-7% of magnesia-calcium sand aggregate with a particle size less than 1mm; 15-20% of magnesia-calcium sand powder with a particle size less than 0.075mm; 5-15% of spinel aggregate with a particle size of 5-3mm; 5-15% of spinel aggregate with a particle size of 3-1mm; 3-7% of spinel aggregate with a particle size less than 1mm; 15-20% of spinel powder with a particle size less than 0.075mm; 8-10% of sintering promoter; and 8-10% of binder. The invention can not only avoid the occurrence of "hydrogenation" and "carbon increase" phenomena, but also has the function of cleaning molten steel, and at the same time has the characteristics of strong corrosion resistance, long service life and convenient construction.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a tundish dry material.
Background
With the increasing market demand for clean steel, steelmaking technology is also developing toward clean purification. The tundish is used as an important component of the continuous casting process, and the last container for holding molten steel plays a role in guaranteeing the quality of molten steel and cleaning the molten steel. The refractory material of the tundish lining is directly contacted with molten steel, so that the requirements of purifying molten steel, prolonging service life, preserving heat and the like are provided for the refractory material of the tundish lining in the industry.
The tundish working lining is eroded and flushed by high-temperature molten steel and slag, and needs to have good slag erosion resistance and penetration resistance, high strength, low heat conductivity and capability of purifying molten steel. The tundish dry material is used as a fourth-generation tundish working lining material, has the advantages of no need of adding any liquid, convenient construction by vibration molding, short baking time, energy conservation and the like, and is rapidly developed and applied.
At present, the tundish dry material mainly adopts magnesia and calcia raw materials, and the bonding agent mainly adopts resin, asphalt, organic matters and the like. Researches show that magnesia and magnesia calcium raw materials contain a large amount of adsorbed water and crystal water, hydroxyl groups in minerals can be removed at high temperature to generate water, and in addition, the calcium raw materials are easy to absorb moisture and hydrate in a cold state, and water is remained in a packing lining, so that the phenomenon of hydrogen increase of molten steel occurs. The organic binder such as resin and asphalt is adopted, harmful substances such as formaldehyde, free phenol and the like can be generated at high temperature, the environment is polluted, and the organic binder can be carbonized, so that the molten steel is carbureted. The organic binder is harmful to the environment, pollutes the molten steel and has high price, and inorganic binders such as phosphate, silicate, sulfate and the like are difficult to sinter and generate irritant gas. The above factors cause secondary pollution to molten steel caused by the tundish dry material, influence the cleanliness of the molten steel, and have difficulties in developing the dry material capable of cleaning the molten steel.
Disclosure of Invention
The invention aims to provide a tundish dry material which can avoid the phenomena of hydrogen increment and carburetion, has the function of cleaning molten steel, and has the characteristics of strong erosion resistance, long service life and convenient construction.
In order to achieve the above purpose, the following technical scheme is adopted:
A tundish dry material with a molten steel cleaning function comprises the following components in percentage by mass:
5-15% of magnesium-calcium sand aggregate with granularity of 5-3 mm;
5-15% of magnesium-calcium sand aggregate with the granularity of 3-1 mm;
3-7% of magnesium-calcium sand aggregate with granularity smaller than 1 mm;
15-20% of magnesium-calcium sand powder with granularity smaller than 0.075 mm;
5-15% of spinel aggregate with granularity of 5-3 mm;
5-15% of spinel aggregate with the granularity of 3-1 mm;
3-7% of spinel aggregate with granularity smaller than 1 mm;
15-20% of spinel powder with granularity smaller than 0.075 mm;
8-10% of a burn promoter;
8-10% of a binding agent.
According to the scheme, the MgO content of the magnesia-calcium sand aggregate and the magnesia-calcium sand powder is more than or equal to 70wt%, the CaO content is 20-30 wt%, the SiO 2 content is less than or equal to 0.2wt%, the Fe 2O3 content is less than or equal to 0.4wt%, the TiO 2 content is 0.8-1.2 wt%, and the ignition decrement content is less than or equal to 0.5wt%.
According to the scheme, the spinel aggregate and the spinel powder are sintered or fused spinel, the content of Al 2O3 is more than or equal to 48wt%, the content of MgO is 45-50 wt%, the content of CaO is less than or equal to 0.6wt%, the content of SiO 2 is less than or equal to 0.3wt%, the content of Na 2 O is less than or equal to 0.2wt%, and the content of Fe 2O3 is less than or equal to 0.4wt%.
According to the scheme, the burning promoter is one or any mixture of magnesia-calcium-iron sand, light clay, iron powder and magnesium powder.
According to the scheme, the Mg content of the magnesia-calcia-iron sand is more than or equal to 80wt%, the CaO content is 5-10 wt%, the Fe 2O3 content is 5-8 wt%, the Al 2O3 content is less than or equal to 0.5wt%, and the SiO 2 content is less than or equal to 1wt%.
According to the scheme, the light clay contains 30-48 wt% of Al 2O3, 50-65 wt% of SiO 2 and less than or equal to 0.5wt% of Fe 2O3.
According to the scheme, the iron powder has the Fe content of more than or equal to 98wt%, the Mn content of less than or equal to 0.4wt%, the Si content of less than or equal to 0.2wt% and the C content of less than or equal to 0.05wt%.
According to the scheme, the Mg content of the magnesium powder is more than or equal to 98wt%, the Fe content is less than or equal to 0.2wt%, and the H 2 O content is less than or equal to 0.1wt%.
According to the scheme, the bonding agent is one or any mixture of boric anhydride, boric acid and sodium borate.
The preparation method of the tundish dry material with the molten steel cleaning function comprises the following steps:
Firstly, uniformly stirring and mixing the magnesia-calcium sand aggregate, the magnesia-calcium sand powder, the spinel aggregate and the spinel powder, and then adding the sintering accelerator and the bonding agent into the mixture and uniformly stirring and mixing the mixture to obtain the finished product.
When in construction on site, firstly pouring the dry material into the bottom of the tundish, ensuring that the thickness of the material layer meets the specified requirement, flattening the surface, then installing a die, pouring the dry material into a gap formed by the die and the cladding, filling the gap to the upper edge of the tundish, starting a motor to vibrate for 5min, supplementing the material, and repeating the steps of vibrating and charging until the dry material is tightly filled up to the edge of the cladding. And starting a baking device on the die, controlling the temperature rising rate to be 6 ℃ per second, rising the temperature to 300 ℃, and preserving the heat for 4 hours. Cooling to below 100 ℃ and demoulding.
Compared with the prior art, the invention has the following beneficial effects:
The invention adopts the magnesia-calcium sand and the spinel as main raw materials, does not contain crystal water and absorb moisture, and effectively eliminates the problem of 'hydrogen increase' of molten steel caused by residual moisture in the tundish working lining. Meanwhile, caO in the magnesia-calcium sand has the characteristics of adsorbing impurities and purifying molten steel, and spinel has good slag erosion resistance and permeability, good thermal shock stability and high temperature resistance, and the service life of the dry material is prolonged.
The adopted bonding agent is one or more of boric anhydride, boric acid and sodium borate, so that the problems that the organic bonding agent generates harmful substances, pollutes the environment, causes carburetion of molten steel after carbonization, pollutes the molten steel and the like are solved. Meanwhile, the problems that inorganic bonding agents are difficult to sinter, irritant gas is generated, the service life is short and the like are solved.
The invention can prevent the hydrogen increase and the carbon increase of molten steel, improve the cleanliness of molten steel, ensure the quality of steel billets, has strong erosion resistance, prolongs the service life, does not generate toxic and harmful substances, does not pollute the environment, does not contain water, reduces the baking time, saves energy sources, is convenient to construct and has quick turnover, and can create better economic benefit and social benefit.
Detailed Description
The following examples further illustrate the technical aspects of the present invention, but are not intended to limit the scope of the present invention.
The specific embodiment provides a tundish dry material with a molten steel cleaning function, which comprises the following components in percentage by mass:
5-15% of magnesia-calcium sand aggregate with the granularity of 5-3 mm, 5-15% of magnesia-calcium sand aggregate with the granularity of 3-1 mm, 3-7% of magnesia-calcium sand aggregate with the granularity of less than 1mm, 15-20% of magnesia-calcium sand powder with the granularity of less than 0.075mm, 5-15% of spinel aggregate with the granularity of 5-3 mm, 5-15% of spinel aggregate with the granularity of 3-1 mm, 3-7% of spinel aggregate with the granularity of less than 1mm, 15-20% of spinel powder with the granularity of less than 0.075mm, 8-10% of sintering accelerator and 8-10% of bonding agent.
Specifically, the magnesium-calcium sand aggregate and the magnesium-calcium sand powder are adopted, wherein the MgO content is more than or equal to 70wt%, the CaO content is 20-30 wt%, the SiO 2 content is less than or equal to 0.2wt%, the Fe 2O3 content is less than or equal to 0.4wt%, the TiO 2 content is 0.8-1.2 wt%, and the ignition decrement content is less than or equal to 0.5wt%.
Specifically, spinel aggregate and spinel powder are adopted as sintering or fused spinel, the content of Al 2O3 is more than or equal to 48wt%, the content of MgO is 45-50wt%, the content of CaO is less than or equal to 0.6wt%, the content of SiO 2 is less than or equal to 0.3wt%, the content of Na 2 O is less than or equal to 0.2wt%, and the content of Fe 2O3 is less than or equal to 0.4wt%.
Specifically, the burning promoter is one or any mixture of magnesia-calcium-iron sand, light clay, iron powder and magnesium powder.
Specifically, the magnesium-calcium-iron sand has the Mg content of more than or equal to 80wt%, the CaO content of 5-10 wt%, the Fe 2O3 content of 5-8 wt%, the Al 2O3 content of less than or equal to 0.5wt% and the SiO 2 content of less than or equal to 1wt%.
The light clay Al 2O3 -48 wt%, siO 2 50-65 wt% and Fe 2O3 less than or equal to 0.5wt%.
The iron powder has Fe content not less than 98wt%, mn content not more than 0.4wt%, si content not more than 0.2wt% and C content not more than 0.05wt%.
The Mg content of the magnesium powder is more than or equal to 98wt%, the Fe content is less than or equal to 0.2wt%, and the H 2 O content is less than or equal to 0.1wt%.
Specifically, the bonding agent is one or any mixture of boric anhydride, boric acid and sodium borate.
The specific embodiment also provides a preparation method of the tundish dry material with the molten steel cleaning function, which comprises the following steps:
Firstly, uniformly stirring and mixing the magnesia-calcium sand aggregate, the magnesia-calcium sand powder, the spinel aggregate and the spinel powder, and then adding the sintering accelerator and the bonding agent into the mixture and uniformly stirring and mixing the mixture to obtain the finished product.
Example 1
A tundish dry material with a molten steel cleaning function comprises the following components in percentage by mass:
10% of magnesia-calcium sand aggregate with the granularity of 5-3 mm, 10% of magnesia-calcium sand aggregate with the granularity of 3-1 mm, 5% of magnesia-calcium sand aggregate with the granularity of less than 1mm, 15% of magnesia-calcium sand powder with the granularity of less than 0.075mm, 10% of fused spinel aggregate with the granularity of 5-3 mm, 10% of fused spinel aggregate with the granularity of 3-1 mm, 5% of fused spinel aggregate with the granularity of less than 1mm, 15% of spinel powder with the granularity of less than 0.075mm, 10% of sintering accelerator (magnesia-calcium sand and light clay are mixed according to a ratio of 1:1), and 10% of bonding agent boric acid.
Firstly, weighing the magnesia-calcium sand aggregate, the magnesia-calcium sand powder, the spinel aggregate and the spinel powder according to a proportion, pouring the mixture into a forced mixer for mixing for 15 minutes, weighing the burning accelerator and the bonding agent according to a proportion, pouring the mixture into the forced mixer for mixing for 15 minutes, and uniformly stirring the mixture to obtain the finished product.
When in construction on site, firstly pouring the dry material into the bottom of the tundish, ensuring that the thickness of the material layer meets the specified requirement, flattening the surface, then installing a die, pouring the dry material into a gap formed by the die and the cladding, filling the gap to the upper edge of the tundish, starting a motor to vibrate for 5min, supplementing the material, and repeating the steps of vibrating and charging until the dry material is tightly filled up to the edge of the cladding. And starting a baking device on the die, controlling the temperature rising rate to be 6 ℃ 66, rising the temperature to 300 ℃, and preserving the heat for 4 hours. When the temperature of the dry material is reduced to below 100 ℃, demolding is carried out.
Example 2
A tundish dry material with a molten steel cleaning function comprises the following components in percentage by mass:
15% of magnesia-calcium sand aggregate with the granularity of 5-3 mm, 15% of magnesia-calcium sand aggregate with the granularity of 3-1 mm, 5% of magnesia-calcium sand aggregate with the granularity of less than 1mm, 15% of magnesia-calcium sand powder with the granularity of less than 0.075mm, 5% of fused spinel aggregate with the granularity of 5-3 mm, 5% of fused spinel aggregate with the granularity of 3-1 mm, 5% of fused spinel aggregate with the granularity of less than 1mm, 15% of spinel powder with the granularity of less than 0.075mm, 10% of sintering accelerator (light clay and iron powder are mixed in a ratio of 1:1), and 10% of bonding agent boric anhydride.
Firstly, weighing the magnesia-calcium sand aggregate, the magnesia-calcium sand powder, the spinel aggregate and the spinel powder according to a proportion, pouring the mixture into a forced mixer for mixing for 15 minutes, weighing the burning accelerator and the bonding agent according to a proportion, pouring the mixture into the forced mixer for mixing for 15 minutes, and uniformly stirring the mixture to obtain the finished product.
When in construction on site, firstly pouring the dry material into the bottom of the tundish, ensuring that the thickness of the material layer meets the specified requirement, flattening the surface, then installing a die, pouring the dry material into a gap formed by the die and the cladding, filling the gap to the upper edge of the tundish, starting a motor to vibrate for 5min, supplementing the material, and repeating the steps of vibrating and charging until the dry material is tightly filled up to the edge of the cladding. And starting a baking device on the die, controlling the temperature rising rate to be 6 ℃ 66, rising the temperature to 300 ℃, and preserving the heat for 4 hours. When the temperature of the dry material is reduced to below 100 ℃, demolding is carried out.
Example 3
A tundish dry material with a molten steel cleaning function comprises the following components in percentage by mass:
5% of magnesia-calcium sand aggregate with the granularity of 5-3 mm, 5% of magnesia-calcium sand aggregate with the granularity of 3-1 mm, 7% of magnesia-calcium sand aggregate with the granularity of less than 1mm, 15% of magnesia-calcium sand powder with the granularity of less than 0.075mm, 15% of sintered spinel aggregate with the granularity of 5-3 mm, 15% of sintered spinel aggregate with the granularity of 3-1 mm, 3% of sintered spinel aggregate with the granularity of less than 1mm, 15% of spinel powder with the granularity of less than 0.075mm, 10% of sintering accelerator (light clay, magnesium powder 1:1 mixture), and 10% of binder (boric acid and sodium borate 1:1 mixture).
Firstly, weighing the magnesia-calcium sand aggregate, the magnesia-calcium sand powder, the spinel aggregate and the spinel powder according to a proportion, pouring the mixture into a forced mixer for mixing for 15 minutes, weighing the burning accelerator and the bonding agent according to a proportion, pouring the mixture into the forced mixer for mixing for 15 minutes, and uniformly stirring the mixture to obtain the finished product.
When in construction on site, firstly pouring the dry material into the bottom of the tundish, ensuring that the thickness of the material layer meets the specified requirement, flattening the surface, then installing a die, pouring the dry material into a gap formed by the die and the cladding, filling the gap to the upper edge of the tundish, starting a motor to vibrate for 5min, supplementing the material, and repeating the steps of vibrating and charging until the dry material is tightly filled up to the edge of the cladding. And starting a baking device on the die, controlling the temperature rising rate to be 6 ℃ 66, rising the temperature to 300 ℃, and preserving the heat for 4 hours. When the temperature of the dry material is reduced to below 100 ℃, demolding is carried out.
The preparation method comprises the steps of adopting 25wt% of magnesia aggregate with the granularity of 5-3mm, 25wt% of magnesia aggregate with the granularity of 3-1mm, 20 wt% of magnesia aggregate with the granularity of less than 1mm, 24wt% of magnesia powder with the granularity of less than 0.075mm, 5wt% of resin and 1wt% of silicate as a control group for comparison. Compared with the common dry material, the hydrogen increment, the carburetion and the inclusion qualification rate of the molten steel are obviously improved, the service life is greatly prolonged, and the specific data are shown in the following table.
| Example 1 | Example 2 | Example 3 | Ordinary dry material | |
| Hydrogen increment (ppm) | 0.5 | 0.6 | 0.4 | 0.8 |
| Carburetion (%) | 0.01 | 0.00 | 0.01 | 0.03 |
| Inclusion yield (%) | 98.97 | 98.32 | 98.85 | 94.51 |
| Service life (furnace) | 21 | 26 | 22 | 17 |
。
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