CN115626830B - Tundish magnesia dry material and preparation method thereof - Google Patents
Tundish magnesia dry material and preparation method thereof Download PDFInfo
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- CN115626830B CN115626830B CN202211292474.9A CN202211292474A CN115626830B CN 115626830 B CN115626830 B CN 115626830B CN 202211292474 A CN202211292474 A CN 202211292474A CN 115626830 B CN115626830 B CN 115626830B
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 161
- 239000000463 material Substances 0.000 title claims abstract description 95
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 81
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 79
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 69
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 69
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 69
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 69
- 239000002131 composite material Substances 0.000 claims abstract description 39
- 239000007767 bonding agent Substances 0.000 claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 13
- 238000005245 sintering Methods 0.000 claims abstract description 13
- 239000012745 toughening agent Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims description 21
- 239000008188 pellet Substances 0.000 claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 17
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 14
- 239000011591 potassium Substances 0.000 claims description 14
- 229910052700 potassium Inorganic materials 0.000 claims description 14
- 238000001125 extrusion Methods 0.000 claims description 11
- 229910000676 Si alloy Inorganic materials 0.000 claims description 10
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 10
- 229910052736 halogen Inorganic materials 0.000 claims description 10
- 150000002367 halogens Chemical class 0.000 claims description 10
- 239000011777 magnesium Substances 0.000 claims description 9
- 229910052749 magnesium Inorganic materials 0.000 claims description 9
- 239000010427 ball clay Substances 0.000 claims description 8
- 238000005469 granulation Methods 0.000 claims description 8
- 230000003179 granulation Effects 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 239000012047 saturated solution Substances 0.000 claims description 8
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 8
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- KEZYHIPQRGTUDU-UHFFFAOYSA-N 2-[dithiocarboxy(methyl)amino]acetic acid Chemical compound SC(=S)N(C)CC(O)=O KEZYHIPQRGTUDU-UHFFFAOYSA-N 0.000 claims description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 5
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 5
- 239000004327 boric acid Substances 0.000 claims description 5
- 229910052796 boron Inorganic materials 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 239000008103 glucose Substances 0.000 claims description 5
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000009704 powder extrusion Methods 0.000 claims description 4
- 239000008213 purified water Substances 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 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 claims description 2
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims description 2
- 125000005619 boric acid group Chemical group 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011230 binding agent Substances 0.000 claims 1
- 238000007873 sieving Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 36
- 239000010959 steel Substances 0.000 abstract description 36
- -1 and meanwhile Substances 0.000 abstract description 2
- 238000009749 continuous casting Methods 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 14
- 238000003723 Smelting Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000005065 mining Methods 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000011819 refractory material Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000746 Structural steel Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000011362 coarse particle Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 235000019640 taste Nutrition 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011850 water-based material Substances 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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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
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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
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
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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
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/402—Aluminium
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
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- C04B2235/428—Silicon
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Abstract
The invention relates to a tundish magnesia dry material and a preparation method thereof, wherein the dry material is prepared from the following raw materials in parts by weight: 62 to 95 parts of sintered magnesia, 15 to 25 parts of small balls of magnesite tailings, 4 to 7 parts of composite normal-temperature bonding agent, 0.2 to 1.5 parts of composite sintering agent and 0.2 to 2.0 parts of composite reinforcing and toughening agent. The invention can effectively meet the use performance requirements of steel mill users on the tundish magnesia dry material, and meanwhile, magnesite tailing powder is used for partially replacing magnesia, so that the consumption of magnesia is reduced, and magnesite resources are saved.
Description
Technical Field
The invention relates to the technical field of refractory materials for a working lining of a tundish for steel smelting, in particular to a tundish magnesia dry material and a preparation method thereof.
Background
The tundish is the last container in the steel smelting process, and the molten steel flows out of the tundish to be cooled and drawn. Therefore, the quality level of the tundish refractory material directly determines whether high-quality clean steel can be smelted. Especially, the tundish working lining refractory material, such as magnesium spray coating, magnesium dry coating and the like, is directly contacted with molten steel, and has extremely large consumption. Development of tundish working lining tolerance has undergone 4 stages: the general development trend of the heat-insulating board, coating material, spray coating material and dry material is that shaped products develop towards unshaped products, acidic materials develop towards alkaline materials, water-based materials develop towards dry materials, and common materials develop towards environment-friendly materials. The tundish dry material is a novel lining material, has been widely applied in China at present, and has the advantages of long continuous casting time, good cleaning effect, high thermal efficiency, low slagging rate, low energy consumption and the like compared with wet spray coating. The tundish dry material is generally made of magnesia materials, and few manufacturers use magnesia-calcia. The tundish magnesia dry material takes magnesia as a main raw material, magnesia with different grades is selected as a main material according to the use requirement, resin, sugar and the like are taken as low-temperature bonding agents, and medium-temperature bonding agents are assisted, wherein the magnesia accounts for more than 90-95% of the whole material, the iron and steel production scale of China is estimated initially, and the magnesia is consumed by more than 100 ten thousand tons only the tundish working lining refractory material every year.
One prominent problem in the current exploitation and utilization of magnesite in China is serious resource waste. For economic reasons and lack of suitable ore dressing technologies, many mines only collect rich ores, but discard so-called lean ores, and in practice, the grade of MgO in the so-called lean ores is above 40%, while foreign magnesite is mined, and ores with MgO grade less than 30% are mined and utilized. Some mines in China have less than 50% of mining rate, even lower mining rate, and great waste of resources is caused. Wherein, mgO 33-45% low-grade magnesite is piled up in large quantity as tailings, which is difficult to be applied to the production of magnesia refractory raw materials.
It is known from field investigation that the price of magnesite containing more than 47% MgO is 130 yuan per ton, while magnesite containing 44-46% MgO is only 20-30 yuan per ton, and the proportion of the ore accounts for more than 70% of the total reserve.
Magnesite resources are not renewable, and the mining method of poor mining and excellent mining ensures that the better the quality resources are, the less the mining is. Therefore, the resource protection problem must be re-recognized and highly appreciated. On one hand, the method improves the MgO content in the low-grade magnesite by a mineral processing technology, reduces the impurity content, fully and reasonably utilizes the existing magnesite resources, and purifies the magnesite by an advanced mineral separation process; on the other hand, the development of the application technology of the low-grade magnesite tailings is urgent.
At present, tundish working lining refractory materials are mainly made of tundish magnesia dry materials, and magnesia with different grades is selected according to the use requirements, wherein the granularity is coarse particles with the granularity of less than or equal to 3mm and more than or equal to 1mm, fine particles with the granularity of less than or equal to 1mm and more than or equal to 0.088mm and fine powder with the granularity of less than 0.088 mm. Resin, saccharides and the like are used as low-temperature bonding agents, medium-temperature bonding agents and high-temperature bonding agents are used as auxiliary agents, and dry mixing is carried out uniformly. When the magnesium-based tundish is used on site, the prefabricated steel mold is fixed as required, then the magnesium dry material of the tundish is uniformly filled into a gap space between the permanent lining of the tundish and the steel mold, and then the steel mold is heated and demoulded to obtain the strength, so that the magnesium-based tundish can be baked for online use. Therefore, the tundish magnesia dry material must have good fluidity and self-tightness.
The particle size standard of the low-grade magnesite tailing powder is generally smaller than 40mm, the tailing particle size difference generated by each enterprise is large, tailing particle data of three different enterprises are randomly extracted for analysis, the tailing powder of most manufacturers is smaller than 1mm and occupies larger part, magnesia is directly replaced to be added into the tundish magnesia dry material, the fluidity of the dry material is seriously affected, and the service performance of the dry material is finally affected.
Therefore, combining with the practical situation that low-grade magnesite tailings are piled up in a large quantity and no place is available, developing a tundish magnesia dry material production technology which uses magnesite tailing powder to replace magnesia partially and meets the requirement of tundish smelting is urgent.
Disclosure of Invention
The invention aims to provide a tundish magnesia dry material and a preparation method thereof, which can effectively meet the use performance requirements of steel mill users on the tundish magnesia dry material, and meanwhile, magnesite tailing powder is used for partially replacing magnesia, so that the consumption of magnesia is reduced, and magnesite resources are saved.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the tundish magnesia dry material is prepared from the following raw materials in parts by weight: 62 to 95 parts of sintered magnesia, 15 to 25 parts of small balls of magnesite tailings, 4 to 7 parts of composite normal-temperature bonding agent, 0.2 to 1.5 parts of composite sintering agent and 0.2 to 2.0 parts of composite reinforcing and toughening agent.
The composite normal-temperature bonding agent is a mixture of more than two of resin powder, glucose, sodium metasilicate pentahydrate and sodium tripolyphosphate.
The mixture ratio is resin powder: glucose: sodium metasilicate pentahydrate: sodium tripolyphosphate= (0-3): (0-3): (0-1): (0-1).
The composite sintering agent is a mixture of more than two of boric acid, sodium shavings and boron glass powder.
The proportion of the mixture is boric acid: wood shaving alkali: boron glass frit= (0-1): (0-3): (0-1).
The composite reinforcing and toughening agent is a mixture of more than three of metal aluminum powder, aluminum-silicon alloy powder, magnesium-aluminum alloy, silicon carbide micro powder and potassium hexatitanate whisker.
The proportion of the mixture is that the aluminum powder: aluminum-silicon alloy powder: magnesium aluminum alloy: silicon carbide micropowder: potassium hexatitanate whisker= (0.1-2): (0.1-2): (0-2): (0-4): (0.1-0.3), wherein the granularity of the silicon carbide micro powder is less than 20 microns, the potassium hexatitanate whisker is fine powder with white color of less than 0.074mm, the granularity of the metal aluminum powder is fine powder with granularity of below 200 meshes, and the granularity of the aluminum-silicon alloy powder is fine powder with granularity of below 200 meshes.
The sintered magnesia comprises 20-30 parts of coarse particles with the diameter of less than 3mm and more than or equal to 1mm, 30-40 parts of fine particles with the diameter of less than 1mm and more than or equal to 0.088mm, and 12-25 parts of fine powder with the diameter of less than 0.088 mm.
The preparation method of the tundish magnesia dry material comprises the steps of extrusion granulation of magnesite tailing powder and preparation of the tundish magnesia dry material, and specifically comprises the following steps:
1) Extruding and granulating magnesite tailing powder:
a) The magnesite tailing powder extrusion granulation raw materials are as follows: 80-89 parts of low-grade magnesite tailing powder, 2-5 parts of 90 light burned magnesium powder, 3.5-7.5 parts of halogen powder, 1-5 parts of ball clay and 4-7 parts of additional purified water;
b) And (3) extruding and granulating: the pelleting machine selects a special feed pelleting machine according to the yield requirement, adopts an extrusion pelleting mode, and firstly uniformly mixes three dry materials of magnesite tailing powder, 90 light burned magnesium powder and ball clay at one time before production, the mixing equipment selects a forced mixer to clean and mix for 3-7 minutes, and the materials are discharged and packed, and the halogen powder and water are prepared into saturated solution; then placing the mixed three mixtures into a stirrer of a special granulating machine for feed, simultaneously placing halogen powder and water to prepare saturated solution, reasonably controlling the addition amount of dry materials, the addition amount of water and the speed, adjusting the feeding speed of pug and the extrusion speed of particles to be suitable, and screening the produced pellets in multiple layers during discharging, wherein the diameter of the produced pellets is 2-4mm which is the small pellets of magnesite tailings meeting the requirements, naturally airing or drying in a kiln, and detecting that the water content is less than 0.2%, thus obtaining the small pellets of magnesite tailings;
2) And premixing the sintered magnesia, the small balls of the finished magnesite tailings, the composite normal-temperature bonding agent, the composite sintering agent and the composite reinforcing and toughening agent in a planetary mixer for 6-12 minutes.
The content of magnesium oxide in the low-grade magnesite tailing powder is 33% -44%, and the granularity is less than or equal to 1mm. The parameters related to the four materials are shown in Table 1.
Table 1 four raw material related parameters in the raw materials for extrusion granulation of magnesite tailing powder
Compared with the prior art, the invention has the beneficial effects that:
1) According to the invention, the low-grade magnesite tailing pellets are introduced into the tundish magnesia dry material for the first time to replace magnesia, thereby saving magnesite resources, reducing energy consumption for producing magnesia, finding out the optimal balance point between the addition of tailing powder and the granularity composition of the tundish magnesia dry material on the basis of experiments on magnesite tailing materials with different tastes, different granularity parameters and different addition amounts, further improving the construction fluidity and the use effect of the tundish magnesia dry material without reducing the service life, and reducing the cost by 10-20%.
2) According to the invention, on the basis of a large number of experiments on magnesite tailing materials with different tastes, different granularity parameters and different addition amounts, the optimal balance point between the addition amount of the tailing powder and the granularity composition of the tundish magnesia dry material is found, so that win-win between the use effect and the cost of the tundish magnesia dry material is realized. Meanwhile, aiming at the fact that the low-grade magnesite tailing powder is thinner and the part smaller than 1mm occupies larger area, and is directly added into the dry material to influence the construction fluidity, the low-grade magnesite tailing powder is processed into 2-4mm cylindrical small balls in an extrusion granulating mode, so that the tundish magnesia dry material has excellent fluidity.
3) The invention refers to potassium hexatitanate whisker, can improve the excellent characteristics of impact strength, elastic modulus, hardness and tensile strength of ceramic materials, resin and other materials, determines the reasonable addition amount of the material in the magnesium dry material of the tundish containing carbon on the basis of a large number of experiments, and introduces the potassium hexatitanate whisker into the magnesium dry material of the tundish for the first time, thereby realizing the effect of reinforcing and toughening. Compared with the original tundish dry material, the novel tundish magnesia dry material added with the potassium hexatitanate whisker has the advantages that the medium-temperature strength withstand voltage at the temperature of 1100 ℃ for 3 hours is improved by 15.9%, the high-temperature strength withstand voltage at the temperature of 1500 ℃ for 1 hour is improved by 12.5%, and the novel tundish magnesia dry material is an important reason that the medium-high-temperature strength is improved and the final service life is not reduced although the magnesite tailing small balls are added. The potassium hexatitanate whisker adopted by the invention is 200 mesh fine powder produced by Shandong Jinan, the diameter of the whisker is 0.5-1.2 microns, and the length of the whisker is 10-100 microns.
Drawings
FIG. 1 is a flow chart of a production process of a tundish magnesia dry material.
Detailed Description
The following is a further description of embodiments of the invention, with reference to examples:
example 1:
the main technical parameters of a certain steel mill are shown in the following table 2, and the production varieties are IF steel, X65-X100 pipeline steel, high-grade non-oriented silicon steel, weather-resistant steel, alloy steel, low carbon steel, high carbon steel, steel for a pressure vessel and the like, 210 tons of converters, 60 tons of tundish, the continuous casting service life of the tundish is longer than 16 tanks, and the continuous casting time is 30-55 minutes/tank.
TABLE 2 example 1 major technical parameters of a Steel works
| Sequence number | Project | Unit (B) | Numerical value | Remarks |
| 1 | Normal tapping amount of converter | t | ～220 | |
| 2 | 230t steel ladle free space height | mm | 350～400 | When 230 tons of molten steel is filled |
| 3 | Maximum steel loading amount of steel ladle | t | 230 | |
| 4 | Average smelting period of converter | min | ～36 | |
| 5 | Average refining period of each ladle | min | ～36 | |
| 6 | Average pouring time of continuous casting of tundish | min | 33 | |
| 7 | Tundish continuous casting width | mm | 900-2150 | |
| 8 | Tundish continuous casting thickness | mm | 230/250 | |
| 9 | Actual continuous casting drawing speed | m/min | 0.8-1.8m/min | |
| 10 | Tundish nozzle quick-change mechanism | Model number SEM2100 of Wei Su Wei |
In order to achieve the production objective, the tundish magnesia dry material can be realized by the following technical scheme, as shown in fig. 1:
the invention relates to a novel tundish magnesia dry material produced by using magnesite tailing powder, which is prepared from the following raw materials in parts by weight: 74 parts of sintered magnesia, 18 parts of small balls of magnesite tailings, 5.8 parts of composite normal-temperature bonding agent, 0.4 part of composite sintering agent and composite reinforcing and toughening agent: 1.8 parts.
20 parts of coarse grains with the diameter of less than 3mm and more than or equal to 1mm, 38 parts of fine grains with the diameter of less than 1mm and more than or equal to 0.088mm and 16 parts of fine powder with the diameter of less than 0.088mm in the sintered magnesia.
The composite normal temperature bonding agent is as follows: resin powder: sodium tripolyphosphate = 2:0.25.
the composite sintering agent is as follows: wood shaving alkali: boron glass frit = 3:1.
the composite reinforcing and toughening agent is as follows: metal aluminum powder: aluminum-silicon alloy powder: potassium hexatitanate whisker = 1:1:0.2, the potassium hexatitanate whisker is fine powder with white color less than 0.074mm, the granularity of the metal aluminum powder is fine powder with granularity below 200 meshes, and the granularity of the aluminum-silicon alloy powder is fine powder with granularity below 200 meshes.
The production method of the tundish magnesia dry material comprises two stages of magnesite tailing powder extrusion granulation and tundish magnesia dry material production, and the specific method comprises the following steps:
1) Preparing magnesite tailing balls: 86 parts of partial material powder with the granularity of less than 1mm of the low-grade magnesite tailing, 5 parts of 90 light burned magnesium powder, 5 parts of halogen powder, 4 parts of ball clay and 6 parts of purified water. The pelletizer selects a special feed pellet pelletizer according to the yield requirement, and adopts an extrusion pelleting mode. Before production, the magnesite tailing powder, the 90 light burned magnesium powder and the ball clay are mixed uniformly at one time, a forced mixer is selected as mixing equipment for clean mixing for 6 minutes, and the mixture is discharged and packaged. The brine powder and water are prepared into saturated solution. And then placing the mixed three mixtures into a stirrer of a special granulating machine for feed, simultaneously placing halogen powder and water to prepare a saturated solution, reasonably controlling the addition amount of dry materials, the addition amount of water and the speed, adjusting the feeding speed of pug and the extrusion speed of particles to be suitable, and screening the produced pellets in multiple layers during discharging, wherein the diameter of the produced pellets is 2-4mm and meets the requirements, and naturally airing or kiln drying the pellets to detect that the water content is less than 0.2%, thus obtaining the finished product pellets of the magnesite tailings. Four material related parameters are shown in table 4.
Table 3 parameters relating to the four raw materials for making magnesite tailing balls in example 1
The small balls of the magnesite tailings are required to have a diameter of more than 4mm or a ball proportion of less than 2mm of less than 5%.
2) Premixing sintered magnesia, finished magnesite tailing balls, a composite normal-temperature bonding agent, a composite sintering agent and a composite reinforcing and toughening agent in a planetary mixer for 10 minutes;
3) And after the mixed materials are discharged, weighing, bagging, batch editing and detecting can be performed, and after the mixed materials are qualified, the mixed materials can be put in storage for waiting.
The application effect is as follows:
the original tundish magnesia dry material of the steel mill has the residual thickness of 20-24.5mm and the residual thickness of 22-26.8mm after continuous casting of 18 furnaces. After the novel tundish magnesia dry material produced by using the magnesite tailing powder is applied, the cost of the dry material is reduced by 15 percent, and after the continuous casting of an 18-furnace is carried out, the residual thickness of the ladle wall is 20.6-24.8mm, the residual thickness of the ladle bottom is 21.8-27.6mm, the use performance of the novel tundish magnesia dry material is basically consistent with that of the original tundish magnesia dry material, the use performance of the novel tundish magnesia dry material is not reduced, and the smelting requirement of a user is completely met.
Example 2:
taking magnesium dry material of tundish in a certain steel mill as an example. The conditions are shown in Table 4:
the product mainly comprises: carbon structural steel, high-quality carbon structural steel, ultra-low carbon steel, low-alloy high-strength steel, structural steel for ship bodies, medium-carbon alloy steel, weather-resistant steel, pipeline steel, steel for automobile structures, pressure vessels, steel for boilers, steel for bridges, silicon steel, tin plates and the like. 300 tons of converter, 70 tons of tundish and continuous casting service life longer than 12 tanks, and continuous casting time of 30-60 minutes per tank.
Table 4 example 2 tundish main parameters
| Sequence number | Project | Unit (B) | Numerical value | Remarks |
| 1 | Normal tapping amount of converter | t | ～302 | |
| 2 | Free space height of 300t molten steel ladle | mm | 320～380 | When 230 tons of molten steel is filled |
| 3 | Maximum steel loading amount of steel ladle | t | 320 | |
| 4 | Average smelting period of converter | min | ～42 | |
| 5 | Average refining period of each ladle | min | ～40 | |
| 6 | Average pouring time of continuous casting of tundish | min | 35 | |
| 7 | Maximum steel loading amount of tundish | t | 70 | |
| 8 | Tundish continuous casting width | mm | 900-2150 | |
| 9 | Tundish continuous casting thickness | mm | 230/250 | |
| 10 | Actual continuous casting drawing speed | m/min | 0.6-1.9m/min |
In order to achieve the production objective, the tundish magnesia dry material can be realized by the following technical scheme:
the invention relates to a novel tundish magnesia dry material produced by using magnesite tailing powder, which is prepared from the following raw materials in parts by weight: 71 parts of sintered magnesia, 20 parts of small balls of magnesite tailings, 6.5 parts of composite normal-temperature bonding agent, 0.5 part of composite sintering agent and 2 parts of composite reinforcing and toughening agent.
Sintered magnesia: 20 parts of coarse particles with the diameter of less than 3mm and more than or equal to 1mm, 35 parts of fine particles with the diameter of less than 1mm and more than or equal to 0.088mm and 16 parts of fine powder with the diameter of less than 0.088 mm.
The composite normal-temperature bonding agent comprises the following components: glucose: sodium metasilicate pentahydrate = 2:0.3.
the composite sintering agent comprises the following components: boric acid: shavingsine = 0.8:3.
the composite reinforcing and toughening agent comprises the following components: metal aluminum powder: aluminum-silicon alloy powder: silicon carbide micropowder: potassium hexatitanate whisker = 1:1:2:0.15, the granularity of the silicon carbide micro powder is less than 20 microns, the potassium hexatitanate whisker is fine powder with white color less than 0.074mm, the granularity of the metal aluminum powder is less than 200 meshes, and the granularity of the aluminum-silicon alloy powder is less than 200 meshes.
The production method for producing the tundish magnesia dry material by using the magnesite tailing powder comprises two stages of magnesite tailing powder extrusion granulation and tundish magnesia dry material production, and comprises the following specific steps:
1) Preparing magnesite tailing balls: 88 parts of partial material powder with the granularity of less than 1mm of low-grade magnesite tailing, 5 parts of 90 light burned magnesium powder, 5 parts of halogen powder, 2 parts of ball clay and 5 parts of purified water. The pelletizer selects a special feed pellet pelletizer according to the yield requirement, and adopts an extrusion pelleting mode. Before production, the magnesite tailing powder, the 90 light burned magnesium powder and the ball clay are mixed uniformly at one time, a forced mixer is selected as mixing equipment for clean mixing for 5 minutes, and the mixture is discharged and packaged. The brine powder and water are prepared into saturated solution. And then placing the mixed three mixtures into a stirrer of a special granulating machine for feed, simultaneously placing halogen powder and water to prepare a saturated solution, reasonably controlling the addition amount of dry materials, the addition amount of water and the speed, adjusting the feeding speed of pug and the extrusion speed of particles to be suitable, and screening the produced pellets in multiple layers during discharging, wherein the diameter of the produced pellets is 2-4mm and meets the requirements, and naturally airing or kiln drying the pellets to detect that the water content is less than 0.2%, thus obtaining the finished product pellets of the magnesite tailings. Four material related parameters are shown in table 5.
Table 5 example 2 parameters relating to the four materials used to make the magnesite tailing balls
The small balls of the magnesite tailings are required to have a diameter of more than 4mm or a ball proportion of less than 2mm of less than 5%.
2) Premixing sintered magnesia, finished magnesite tailing balls, a composite normal-temperature bonding agent, a composite sintering agent and a composite reinforcing and toughening agent in a planetary mixer for 10 minutes;
3) And after the mixed materials are discharged, weighing, bagging, batch editing and detecting can be performed, and after the mixed materials are qualified, the mixed materials can be put in storage for waiting.
The application effect is as follows:
after 12 furnaces are continuously poured, the residual thickness of the ladle wall of the original tundish magnesia dry material of the steel mill is 28.9-35.1mm, and the residual thickness of the ladle bottom is 32.5-38.2mm. After the novel tundish magnesia dry material produced by using the magnesite tailing powder is applied, the cost of the dry material is reduced by 16.9%, and after the 12 furnaces are continuously poured, the dry material has smooth and complete working lining, high strength, 30.9-40.6mm of residual thickness of a package wall and 32.3-42mm of residual thickness of a package bottom, is basically consistent with the use performance of the original tundish magnesia dry material, has no reduction, and completely meets the smelting needs of users.
Claims (6)
1. The tundish magnesia dry material is characterized by being prepared from the following raw materials in parts by weight: 62 to 95 parts of sintered magnesia, 15 to 25 parts of small balls of magnesite tailings, 4 to 7 parts of composite normal-temperature bonding agent, 0.2 to 1.5 parts of composite sintering agent and 0.2 to 2.0 parts of composite reinforcing and toughening agent;
the composite sintering agent is a mixture of more than two of boric acid, sodium shavings and boron glass powder, and the proportion of the mixture is boric acid: wood shaving alkali: boron glass frit= (0-1): (0-3): (0-1);
the composite reinforcing and toughening agent is a mixture of more than three of metal aluminum powder, aluminum-silicon alloy powder, magnesium-aluminum alloy, silicon carbide micro powder and potassium hexatitanate whisker; the proportion of the mixture is that the aluminum powder: aluminum-silicon alloy powder: magnesium aluminum alloy: silicon carbide micropowder: potassium hexatitanate whisker= (0.1-2): (0.1-2): (0-2): (0-4): (0.1-0.3), wherein the granularity of the silicon carbide micro powder is less than 20 microns, the potassium hexatitanate whisker is fine powder with the granularity of less than 0.074mm, the granularity of the metal aluminum powder is fine powder with the granularity of less than 200 meshes, and the granularity of the aluminum-silicon alloy powder is fine powder with the granularity of less than 200 meshes.
2. The tundish magnesium dry material according to claim 1, wherein the composite normal temperature binding agent is a mixture of more than two of resin powder, glucose, sodium metasilicate pentahydrate and sodium tripolyphosphate.
3. A tundish magnesia dry material as claimed in claim 2, wherein the mixture ratio is resin powder: glucose: sodium metasilicate pentahydrate: sodium tripolyphosphate= (0-3): (0-3): (0-1): (0-1).
4. The tundish magnesia dry material according to claim 1, wherein the sintered magnesia comprises 20-30 parts of coarse grains with the diameter of less than 3mm and more than or equal to 1mm, 30-40 parts of fine grains with the diameter of less than 1mm and more than or equal to 0.088mm and 12-25 parts of fine powder with the diameter of less than 0.088 mm.
5. A method for preparing a tundish magnesia dry material as claimed in any one of claims 1 to 4, comprising extrusion granulation of magnesite tailing powder and preparation of the tundish magnesia dry material, which comprises the following steps:
1) Extruding and granulating magnesite tailing powder:
a) The magnesite tailing powder extrusion granulation raw materials are as follows: 80-89 parts of low-grade magnesite tailing powder, 2-5 parts of 90 light burned magnesium powder, 3.5-7.5 parts of halogen powder, 1-5 parts of ball clay and 4-7 parts of additional purified water;
b) And (3) extruding and granulating: adopting an extrusion granulation mode, firstly uniformly mixing three dry materials of magnesite tailing powder, 90 light burned magnesium powder and ball clay at one time, and preparing saturated solution by halogen powder and water; then placing the mixed three mixtures into a stirrer of a granulating machine, simultaneously placing halogen powder and water to prepare a saturated solution, sieving the prepared pellets during discharging, wherein the diameter of the pellets is 2-4mm which is the small pellets of magnesite tailings meeting the requirements, naturally airing or drying in a kiln, and detecting that the water content is less than 0.2%, thus obtaining the small pellets of magnesite tailings;
2) Premixing sintered magnesia, small balls of finished magnesite tailings, a composite normal-temperature bonding agent, a composite sintering agent and a composite reinforcing and toughening agent in a stirrer for 6-12 minutes.
6. The method for preparing a tundish magnesia dry material according to claim 5, wherein the magnesia content in the low-grade magnesite tailing powder is 33% -44%, and the granularity is less than or equal to 1mm.
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| EP2060640A1 (en) * | 2007-11-06 | 2009-05-20 | Refratechnik Holding GmbH | Fire-resistant light granules and method of their production |
| CN108530090A (en) * | 2018-05-07 | 2018-09-14 | 濮阳濮耐高温材料（集团）股份有限公司柳屯分厂 | A kind of lightweight liner in dundish and preparation method thereof |
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