CN103771870A - Preparation method of tundish dry working lining - Google Patents
Preparation method of tundish dry working lining Download PDFInfo
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- CN103771870A CN103771870A CN201210404879.7A CN201210404879A CN103771870A CN 103771870 A CN103771870 A CN 103771870A CN 201210404879 A CN201210404879 A CN 201210404879A CN 103771870 A CN103771870 A CN 103771870A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 26
- GUBGYTABKSRVRQ-PICCSMPSSA-N Maltose Natural products O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@@H]1O[C@@H]1[C@@H](CO)OC(O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-PICCSMPSSA-N 0.000 claims abstract description 16
- OWEGMIWEEQEYGQ-UHFFFAOYSA-N 100676-05-9 Natural products OC1C(O)C(O)C(CO)OC1OCC1C(O)C(O)C(O)C(OC2C(OC(O)C(O)C2O)CO)O1 OWEGMIWEEQEYGQ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052582 BN Inorganic materials 0.000 claims abstract description 12
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 12
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 31
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 22
- 239000001095 magnesium carbonate Substances 0.000 claims description 21
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 21
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 21
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 21
- 239000004576 sand Substances 0.000 claims description 20
- 239000011575 calcium Substances 0.000 claims description 18
- 229910052791 calcium Inorganic materials 0.000 claims description 18
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 16
- 238000005056 compaction Methods 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 6
- 210000002219 extraembryonic membrane Anatomy 0.000 claims description 5
- 239000000203 mixture Substances 0.000 abstract description 10
- 239000002245 particle Substances 0.000 abstract 4
- 239000000440 bentonite Substances 0.000 abstract 1
- 229910000278 bentonite Inorganic materials 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000007767 bonding agent Substances 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000009749 continuous casting Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000010459 dolomite Substances 0.000 description 3
- 229910000514 dolomite Inorganic materials 0.000 description 3
- 150000003016 phosphoric acids Chemical class 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 229920003987 resole Polymers 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002085 irritant Substances 0.000 description 2
- 231100000021 irritant Toxicity 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229910052609 olivine Inorganic materials 0.000 description 2
- 239000010450 olivine Substances 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000011863 silicon-based powder Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 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 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- GUBGYTABKSRVRQ-QUYVBRFLSA-N beta-maltose Chemical compound OC[C@H]1O[C@H](O[C@H]2[C@H](O)[C@@H](O)[C@H](O)O[C@@H]2CO)[C@H](O)[C@@H](O)[C@@H]1O GUBGYTABKSRVRQ-QUYVBRFLSA-N 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- 230000005251 gamma ray Effects 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- -1 hydrocarbon oxygen compound Chemical class 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
- Ceramic Products (AREA)
Abstract
The invention discloses a preparation method of a tundish dry working lining. The preparation method comprises the following steps of 1, putting 18-22 parts of fused magnesia having the particle sizes of 3-1mm, 30-32 parts of fused magnesia having the particle sizes of 1-0.074mm and 8-10 parts of fused magnesia having the particle sizes less than 0.074mm into a mixer, carrying out mixing for 3-5min, adding 4-6 parts of maltose into the mixture, carrying out mixing for 3-5min, adding 6-10 parts of MgO-CaO clinker having the particle size of 0.5-0.074mm, 4-6 parts of bentonite and 1-2 parts of boron nitride into the mixture, carrying out mixing for 15-20min and discharging the mixture, and 2, carrying out blank film vibration molding on the mixture obtained by the step 1, carrying out baking at a temperature of 150-170 DEG C and carrying out demolding.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, relate in particular to a kind of preparation method of dry working lining.
Background technology
Tundish is the intermediate store that in steel-making continuous casting production process, molten steel is diverted to crystallizer from ladle, most important with many stoves continuous casting to guaranteeing clean steel-making.Tundish plays important effect by the quality stable and raising continuous casting steel that the quality of refractory quality flows inclusion, the maintenance steel got rid of in molten steel.To bakie working lining with the requirement of refractory materials be: resistance to erosion, antiscour, good heat insulation, does not pollute molten steel, is easy to construction and takes off bag etc.
At present, liner in dundish changes magnesia, the calcareous unshape refractory of magnesium into by silica heat-insulating plate, form of construction work by build by laying bricks or stones change into manual smear, mechanically spraying, along with quoting of Quick changing gate technology, developed tundish dry vibratory material, for example:
" alkaline dry liner for intermediate ladle of continuous casting " (CN 01115190.0) technology, it is the unsetting composition take magnesia as main body, its component is percentage composition meter by weight: magnesia 85-95%, boride 0.5-3.0%, thermoplastic material 2-10%, phosphoric acid salt 1-3%, fluorochemical 1-3%;
" the calcareous dry-type working lining of a kind of novel tundish magnesium " (CN 02117935.2) technology, take synthetic magnesia-calcium clinker, passivation dolomite sand, passive lime stone sand, calcination dolomite sand, lime kilning stone sand etc. as calcareous raw material, take iron scale, clay, silicon powder etc. as sintering aid, take resin, malt sugar, PVC as bonding agent, through evenly mixing and make in formula inner lining material, at the scene by the construction of tundish mould tire, and with 150-350 ℃ of baking 1-3 hour, take off mould tire, working lining;
" continuous casting liner in dundish " (CN02116839.3) technology, magnesia 80-95%, alumina 1-10% soft clay 1-5%, organic thermoplastic compound 2-15%;
" a kind of novel dry working lining " (CN1459345A) and " a kind of continuous casting with tundish dry vibratory material and preparation method thereof " (CN200410061192.3) technology, take magnesia, olivine sand, synthetic magnesia-calcium clinker, passivation dolomite sand, calcination olivine sand as basic raw material, take Tai-Ace S 150, polymerize aluminum chloride, halogen, water glass and a small amount of phosphoric acid salt etc. as bonding agent, take iron scale, clay, silicon powder as sintering aid, through evenly mixing and make dry type inner lining material;
" a kind of centre is wrapped in the preparation method of formula vibration material " (CN1821178A) technology, take magnesia or forsterite as basic raw material, take Starso as bonding agent, through evenly mixing and make dry type inner lining material.
The above-mentioned dry materials of making bonding agent with resol, owing to not generating a large amount of eutectics under not moisture and high temperature, extends work-ing life.But resol price is higher on the one hand, makes dry materials cost higher; In bake process, have on the other hand the generations such as irritant gas ammonia, formaldehyde, contaminate environment, the carbon after resin charing, the obvious carburetting of Hydrogen Energy increase hydrogen.And dry materials take phosphoric acid salt, oxymuriate, vitriol as bonding agent has strong and stimulating γ-ray emission, contaminate environment in baking or use procedure.And dry materials take Starso as bonding agent is due to the existing of strong flux sodium oxide, and the work-ing life of remarkably influenced material and disintegration performance.
" a kind of preparation method of dry working lining " (CN101077523) technology discloses: a kind of preparation method of dry working lining, its by weight percentage content the magnesia of 85-95% is mixed with glucose or the citric acid of 5-15%, after stirring, adopt the vibratory compaction of mould tire, 200-400 ℃ of baking, after the demoulding, obtain dry working lining.Although the problem of polluting has been avoided in this patent application, because component is too simple, causes the strength decreased of tundish.
Summary of the invention
The object of the invention is to propose a kind of preparation method of dry working lining, this vibration material has no irritating odor, not can to molten steel recarburization increase hydrogen, erosion-resisting characteristics good, disintegrate easily, and intensity is high.
For reaching this object, the present invention by the following technical solutions:
A kind of preparation method of tundish dry vibratory material, this vibration material is made up of following component in weight part: 3-1mm electrosmelted magnesite clinker 18-22 part, 1mm-0.074mm electrosmelted magnesite clinker 30-32 part, < 0.074mm electrosmelted magnesite clinker 8-10 part, 0.5mm-0.074mm calcium magnesia sand 6-10 part, wilkinite 4-6 part, boron nitride 1-2 part, maltose 4-6 part, in described calcium magnesia sand, CaO content is 45-55%, described preparation method is:
1) electrosmelted magnesite clinker is weighed to proportioning by above-mentioned grain size distribution, then add in stirrer, mix 3-5 minute, then add maltose mixing 3-5 minute, add calcium magnesia sand, wilkinite and boron nitride, remix 15-20 minute discharging;
2) adopt fetal membrane vibratory compaction, 150-170 ℃ of baking, the demoulding obtains tundish dry vibratory material.
The present invention has following beneficial effect:
1) the present invention is on the basis of great many of experiments, by the grain size distribution to electrosmelted magnesite clinker and add appropriate calcium magnesia sand and boron nitride, coordinates as bonding agent using wilkinite and maltose in addition, and the strength ratio prior art of vibration material is improved more than 40%.
2) preparation method of the present invention is not by all component mixed once, but adopts the batch mixing order of above-mentioned uniqueness, makes the combination better effects if of Starso and wilkinite and each component, thereby has guaranteed the intensity of dry-type vibration material.
3) maltose that the present invention adopts can cold melt in bake process, makes dry materials produce intensity with the temperature continuous polymerization that raises; To compare be the hydrocarbon oxygen compound of molecular weight for maltose and resol in addition, and easy oxidized eliminating in bake process does not have irritant gas to produce yet.So the dry materials obtaining is not easy to increase hydrogen to molten steel recarburization, and erosion-resisting characteristics is good, be also easy to disintegrate, environmental friendliness.
Embodiment
Embodiment mono-
A kind of preparation method of tundish dry vibratory material, this vibration material is made up of following component in weight part: 18 parts of 3-1mm electrosmelted magnesite clinkers, 1mm-0.074mm 32 parts of electrosmelted magnesite clinkers, 8 parts of < 0.074mm electrosmelted magnesite clinkers, 10 parts of 0.5mm-0.074mm calcium magnesia sands, 4 parts of wilkinites, 2 parts of boron nitride, 4 parts of maltose, in described calcium magnesia sand, CaO content is 45-55%, described preparation method is:
1) electrosmelted magnesite clinker is weighed to proportioning by above-mentioned grain size distribution, then add in stirrer, mix 3 minutes, then add maltose to mix 5 minutes, add calcium magnesia sand, wilkinite and boron nitride, remix discharging in 15 minutes;
2) adopt fetal membrane vibratory compaction, 150 ℃ of bakings, the demoulding obtains tundish dry vibratory material.
Embodiment bis-
A kind of preparation method of tundish dry vibratory material, this vibration material is made up of following component in weight part: 22 parts of 3-1mm electrosmelted magnesite clinkers, 1mm-0.074mm 30 parts of electrosmelted magnesite clinkers, 10 parts of < 0.074mm electrosmelted magnesite clinkers, 6 parts of 0.5mm-0.074mm calcium magnesia sands, 6 parts of wilkinites, 1 part of boron nitride, 6 parts of maltose, in described calcium magnesia sand, CaO content is 45-55%, described preparation method is:
1) electrosmelted magnesite clinker is weighed to proportioning by above-mentioned grain size distribution, then add in stirrer, mix 5 minutes, then add maltose to mix 3 minutes, add calcium magnesia sand, wilkinite and boron nitride, remix discharging in 20 minutes;
2) adopt fetal membrane vibratory compaction, 170 ℃ of bakings, the demoulding obtains tundish dry vibratory material.
Embodiment tri-
A kind of preparation method of tundish dry vibratory material, this vibration material is made up of following component in weight part: 20 parts of 3-1mm electrosmelted magnesite clinkers, 1mm-0.074mm 31 parts of electrosmelted magnesite clinkers, 9 parts of < 0.074mm electrosmelted magnesite clinkers, 8 parts of 0.5mm-0.074mm calcium magnesia sands, 5 parts of wilkinites, 1.5 parts of boron nitride, 5 parts of maltose, in described calcium magnesia sand, CaO content is 45-55%, described preparation method is:
1) electrosmelted magnesite clinker is weighed to proportioning by above-mentioned grain size distribution, then add in stirrer, mix 4 minutes, then add maltose to mix 4 minutes, add calcium magnesia sand, wilkinite and boron nitride, remix discharging in 18 minutes;
2) adopt fetal membrane vibratory compaction, 160 ℃ of bakings, the demoulding obtains tundish dry vibratory material.
Claims (1)
1. the preparation method of a tundish dry vibratory material, it is characterized in that, this vibration material is made up of following component in weight part: 3-1mm electrosmelted magnesite clinker 18-22 part, 1mm-0.074mm electrosmelted magnesite clinker 30-32 part, < 0.074mm electrosmelted magnesite clinker 8-10 part, 0.5mm-0.074mm calcium magnesia sand 6-10 part, wilkinite 4-6 part, boron nitride 1-2 part, maltose 4-6 part, in described calcium magnesia sand, CaO content is 45-55%, and described preparation method is:
1) electrosmelted magnesite clinker is weighed to proportioning by above-mentioned grain size distribution, then add in stirrer, mix 3-5 minute, then add maltose mixing 3-5 minute, add calcium magnesia sand, wilkinite and boron nitride, remix 15-20 minute discharging;
2) adopt fetal membrane vibratory compaction, 150-170 ℃ of baking, the demoulding obtains tundish dry vibratory material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210404879.7A CN103771870A (en) | 2012-10-22 | 2012-10-22 | Preparation method of tundish dry working lining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210404879.7A CN103771870A (en) | 2012-10-22 | 2012-10-22 | Preparation method of tundish dry working lining |
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| Publication Number | Publication Date |
|---|---|
| CN103771870A true CN103771870A (en) | 2014-05-07 |
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|---|---|---|---|
| CN201210404879.7A Pending CN103771870A (en) | 2012-10-22 | 2012-10-22 | Preparation method of tundish dry working lining |
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| Country | Link |
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| CN (1) | CN103771870A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862547A (en) * | 2017-02-28 | 2017-06-20 | 山东钢铁股份有限公司 | A kind of bakie working lining inner lining structure for adsorbing inclusion content in melting steel |
| CN112194465A (en) * | 2020-10-12 | 2021-01-08 | 北京利尔高温材料股份有限公司 | Tundish dry material and preparation method thereof |
| CN112500135A (en) * | 2021-02-05 | 2021-03-16 | 北京利尔高温材料股份有限公司 | Magnesium-calcium tundish dry working lining material and preparation method thereof |
-
2012
- 2012-10-22 CN CN201210404879.7A patent/CN103771870A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106862547A (en) * | 2017-02-28 | 2017-06-20 | 山东钢铁股份有限公司 | A kind of bakie working lining inner lining structure for adsorbing inclusion content in melting steel |
| CN106862547B (en) * | 2017-02-28 | 2019-04-23 | 山东钢铁股份有限公司 | A kind of bakie working lining inner lining structure adsorbing inclusion content in melting steel |
| CN112194465A (en) * | 2020-10-12 | 2021-01-08 | 北京利尔高温材料股份有限公司 | Tundish dry material and preparation method thereof |
| CN112194465B (en) * | 2020-10-12 | 2022-06-17 | 北京利尔高温材料股份有限公司 | Tundish dry material and preparation method thereof |
| CN112500135A (en) * | 2021-02-05 | 2021-03-16 | 北京利尔高温材料股份有限公司 | Magnesium-calcium tundish dry working lining material and preparation method thereof |
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Application publication date: 20140507 |