CN1054245A - Continuous casting tundish insulating board and preparation method thereof - Google Patents
Continuous casting tundish insulating board and preparation method thereof Download PDFInfo
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- CN1054245A CN1054245A CN 91102229 CN91102229A CN1054245A CN 1054245 A CN1054245 A CN 1054245A CN 91102229 CN91102229 CN 91102229 CN 91102229 A CN91102229 A CN 91102229A CN 1054245 A CN1054245 A CN 1054245A
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- continuous casting
- insulating board
- casting tundish
- sand
- tundish
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Abstract
What the present invention relates to is that steel continuous casting process tundish inner lining fireproof material is watered in a kind of smelting, and the main component that it is characterized in that it is forsterite sand, magnesia or chromium sand, filamentary material, additive, combined binder.After loosening, concentrate, stir ∴, mixing, suction strainer extrusion forming under the vacuum of 40000～55000Pa forms through 150～250 ℃ of temperature dryings again.
The continuous casting tundish liner heat-insulating shield that the present invention makes below the use temperature of tundish, can not produce " increasing hydrogen ", " increasing silicon ", " boiling " phenomenon, middle hot strength height, and production cost is lower, low price.
Description
What the present invention relates to is to water in the steel continuous casting process at smelting industry, tundish inner lining fireproof material continuous casting tundish insulating board and preparation method thereof.
Water in the steel continuous casting process at smelting industry, the kind of tundish inner lining fireproof material and quality are the important factors that influences continuous casting production and slab quality.Domestic present tundish liner mainly adopts the resin-bonded silica heat-insulating plate, when this heat-insulating shield is used for the liner of alloy steel continuous casting tundish, and the manganese element generation redox reaction in silicon-dioxide and the molten steel:
The Si that reaction generates enters molten steel, produces " increasing silicon " effect, because resin cracking at high temperature makes molten steel produce " increasing hydrogen " phenomenon.Reduce the cleanliness factor of steel billet, influenced the quality of steel billet.
In order to satisfy the needs of steel alloy quality, China has developed magnesium thermal insulation board, and has introduced a magnesium thermal insulation board production line from the U.S..Because producing the base-material of this kind magnesium thermal insulation board use is magnesia, magnesia is easy to take place hydration reaction in production processes such as slurrying, press filtration, drying:
That is to say the Mg(OH that in magnesium thermal insulation board, is easy to residual some amount)
2, these Mg(OH)
2Under the effect of casting molten steel, produce a large amount of water vapors, volumetric expansion produces huge pressure up to several thousand times, makes molten steel produce boiling phenomenon, and the subcutaneous residual bubble of continuous casting steel billet forms and is waste product when serious.Virgin resin bonded magnesium thermal insulation board in addition, middle hot strength is low, and through 800～1000 ℃ of bakings, the resin oxidation loses intensity, causes slump or fractures, and resin is cracking at high temperature, molten steel is produced increase the hydrogen effect.Virgin resin bonded magnesium thermal insulation board production cost costs an arm and a leg than higher.
The objective of the invention is to adopt the main raw material of natural boltonite sand as the continuous casting tundish insulating board, add filamentary material, combined binder, additive etc., produce promptly not molten steel is produced " increasing silicon " effect that " increases hydrogen ", do not make the molten steel boiling again, and middle hot strength height, cost is low, the continuous casting tundish insulating board of anti-etch.
Continuous casting tundish insulating board of the present invention, its batching is (weight percent):
Forsterite sand 60～88%
Magnesia powder or chromium ore fine powder 5～30%
Filamentary material 2～8%
Sal epsom or tripoly phosphate sodium STPP 0.5～7.0%
Resol 0.5～4.5%
Borax or boric acid 0.1～2.5%
Wherein in the forsterite sand MgO content greater than 45%, SiO
2Less than 0.25mm, the intermediate particle of 0.15～0.088mm is greater than 50% less than 45% granularity for content.Magnesia powder contains MgO greater than 85%, and chromium ore fine powder contains Cr
2O
3Greater than 35%, granularity is less than 0.088mm.Filamentary material comprises aluminosilicate refractory fiber, asbestos, rock wool, waste paper, man-made fiber etc.
Filamentary material is put in the jar of loosening, loosens, concentrate, add fire-resistant base material, wedding agent and additive stir, and slurrying in the same jar of loosening.Shaping slab pressurizes vacuum filtering shape process, vacuum tightness 40000～55000Pa(gauge pressure up and down then), drying temperature is 150～250 ℃.
With the alloy steel continuous casting tundish insulating board of batching of the present invention and prepared, in the use of continuous casting tundish,, can not produce " increasing silicon ", " boiling ", " increasing hydrogen " phenomenon through the baking of the high-temperature molten steel below 1600 ℃.This is because the fusing point of forsterite is 1890 ℃, and is very stable, can not produce free SiO
2React with the Mn in the molten steel, also can not produce free MgO and H
2O produces hydration reaction.Both made and contained a spot of SiO
2, also can generate forsterite with the MgO reaction that adds in an amount of magnesia, still can not react with the Mn in the molten steel.Because forsterite sand is a kind of lean material, hydration reaction can not take place, so in use can not make steel that " boiling " phenomenon takes place.And adopting the forsterite raw material different with working conditions, the chromium ore fine powder of allocating into has in right amount remedied the defective of eutectics such as ferric oxide in the forsterite and clinoenstatite, forms dystectic composite spinelle ((MgFe) (CrAlFl)
2O
4), improved the high-temperature behavior and the intensity of goods.The white olivine heat-insulating shield is not found obvious crackle through using, and does not take place in the casting cycle to collapse yet, and wears the bag accident.Employing had both improved the middle hot strength of goods based on the combined binder of inorganic bonding agent, had eliminated heat-insulating shield " increasing hydrogen " effect to steel again, and was very little to the continuous casting steel pollution, compared with organic heat-insulating shield, can reduce the H in the steel
2, O
2Deng gas, improved the clarity of continuous casting steel, improved the quality of strand.The ability of alkali resistant, resistance to acid slag corrosion is strong.This is because in casting cycle, generates the thick sintered layer of 1～2mm on the wooden partition, and it can stop the percdation of molten steel-slag to heat-insulating shield.Its thermal conductivity is little, and heat-insulating property is good, and molten steel per minute temperature drop is average about 0.4 ℃ in the casting cycle, can make molten steel keep certain superheating temperature.Cheap, can reduce the continuous casting cost.
Embodiment 1:
Getting MgO content is 46.25%, SiO
2Content is 42.53%, and granularity is less than 0.25mm, and wherein 0.15～0.088mm accounts for 1600 kilograms of 50～55% forsterites, accounts for 80% of ratio of components; Granularity is 140 kilograms of 89.85% magnesia powders less than 0.088mm, MgO content, accounts for 7% of ratio of components; 60 kilograms of aluminum silicate fibers account for 3% of ratio of components; 40 kilograms of toilet papers account for 2% of ratio of components; The sal epsom 120 kg accounts for 6% of ratio of components; 30 kilograms in resol accounts for 1.5% of ratio of components; 10 kilograms of boraxs account for 0.5% of ratio of components.In the same jar of loosening, earlier fiber is loosened, then with other material stirring pulping, upper and lower vacuum suction filter extrusion forming, vacuum tightness is the 55000Pa(gauge pressure), 180 ℃ of drying temperatures, 20 hours time of drying, after testing, physicals sees Table 1.
Table 1. forsterite continuous casting tundish is exhausted
Hot plate physicals detected result
Embodiment 2:
Getting MgO content is 46.80%, SiO
2Content is 43.13%, and granularity is less than 0.25mm, and wherein 0.15～0.088mm accounts for 1400 kilograms of forsterites more than 50%, accounts for 70% of ratio of components; Granularity is less than 0.088mm, Cr
2O
3Content be 310 kilograms of 38% chromium sand fine powders, account for 15.5% of ratio of components; 80 kilograms of aluminum silicate fibers account for 4% of ratio of components; 20 kilograms on man-made fiber accounts for 1% of ratio of components, and 90 kilograms of tripoly phosphate sodium STPPs account for 4.5% of ratio of components; 70 kilograms in resol accounts for 3.5% of ratio of components; 30 kilograms of boric acid account for 1.5% of ratio of components.In the same jar of loosening, earlier fiber loosened, concentrate, then with other material stirring pulping, vacuum suction filter extrusion forming up and down, vacuum tightness 48000Pa(gauge pressure), 200 ℃ of drying temperatures, 18 hours time of drying.After testing, physicals sees Table 2.
Table 2. forsterite continuous casting tundish is exhausted
Hot plate physicals detected result
Embodiment 3:
Getting MgO content is 45.5%, SiO
2Content is 44.5%, granularity＜0.25mm, and wherein 0.15～0.088mm accounts for 1200 kilograms of 55% forsterites, accounts for 60% of ratio of components; Granularity＜0.088mm, MgO content are 200 kilograms of 90% magnesia powders; Account for 10% of ratio of components; Cr
2O
3Content is 300 kilograms of 40% chromium sand fine powders, accounts for 15% of ratio of components; Mineral wool fibre, yellow paper 120 kg account for 6% of ratio of components; 70 kilograms in sal epsom accounts for 3.5% of ratio of components; 70 kilograms in resol accounts for 3.5% of ratio of components; 40 kilograms of boraxs account for 2.0% of ratio of components; In the same jar of loosening, earlier fiber is loosened, then with other material stirring pulping, vacuum suction filter extrusion forming, vacuum tightness 40000Pa(gauge pressure), 250 ℃ of drying temperatures, 16 hours time of drying.After testing, physicochemical property sees Table 3.
Table 3. forsterite continuous casting tundish is exhausted
Hot plate physicochemical property detected result
Claims (4)
1, a kind of continuous casting tundish insulating board is characterized in that by forsterite sand, magnesia or chromium sand fine powder, filamentary material, sal epsom or tripoly phosphate sodium STPP, resol, borax or boric acid combination.
2, continuous casting tundish insulating board according to claim 1 is characterized in that: (weight percent):
Forsterite sand 60～88%
Magnesia powder or chromium sand fine powder 5～30%
Filamentary material 2～8.0%
Sal epsom or tripoly phosphate sodium STPP 0.5～7.0%
Resol 0.5～4.5%
Borax or boric acid 0.1～2.5%
3, according to claim 1,2 described continuous casting tundish insulating board, it is characterized in that: the content of MgO is not less than 45% in the forsterite sand, SiO
2Content be not higher than 45%, granularity is not more than 0.25mm, wherein the rice of 0.15～0.088mm is no less than 50%;
4, a kind of preparation method of continuous casting tundish insulating board, it is characterized in that: the loosening of fiber, concentrate and the mixing of other powder is stirred in the same jar of loosening and carries out, adopt the upper and lower vacuum suction filter extrusion forming of slab, its vacuum tightness is 40000Pa～55000Pa, 150～250 ℃ of drying temperatures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102229 CN1029474C (en) | 1991-04-12 | 1991-04-12 | Heat-insulating plate for pouring basket in continuous cast and preparing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91102229 CN1029474C (en) | 1991-04-12 | 1991-04-12 | Heat-insulating plate for pouring basket in continuous cast and preparing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1054245A true CN1054245A (en) | 1991-09-04 |
| CN1029474C CN1029474C (en) | 1995-08-09 |
Family
ID=4905479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91102229 Expired - Fee Related CN1029474C (en) | 1991-04-12 | 1991-04-12 | Heat-insulating plate for pouring basket in continuous cast and preparing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1029474C (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045281C (en) * | 1993-09-03 | 1999-09-29 | 中国科学院上海硅酸盐研究所 | Silicon nitride combined with silicon carbide refractory material for pouring ladle gate |
| CN1045282C (en) * | 1993-09-03 | 1999-09-29 | 中国科学院上海硅酸盐研究所 | High-compact low-porosity silicon nitride-silicon carbide-oxide system as refractory material |
| CN100455544C (en) * | 2006-09-05 | 2009-01-28 | 杨德报 | Fire resisting plate and its preparation method |
| CN101544506B (en) * | 2009-04-17 | 2011-09-14 | 陈红良 | Raw material formula of tundish insulating board and preparation method for tundish insulating board |
| CN102181962A (en) * | 2010-09-30 | 2011-09-14 | 南京理工大学 | Method for preparing thin-diameter zirconium oxide fibers and fiber board thereof |
| CN101367636B (en) * | 2008-09-27 | 2012-07-04 | 武汉科技大学 | Light heat-insulating plate and manufacturing method therefor |
| CN105414460A (en) * | 2015-11-23 | 2016-03-23 | 合肥李诺新材料贸易有限公司 | High-pouring-precision composite modified sodium silicate-bonded sand for pump valve casting and preparation method thereof |
| CN109020581A (en) * | 2018-09-21 | 2018-12-18 | 成都尚威耐火材料有限公司 | A kind of casting tundish composite dry material and preparation method thereof |
| CN116023159A (en) * | 2022-12-21 | 2023-04-28 | 南京钢铁股份有限公司 | Fiber reinforced magnesia dry material for tundish for smelting variety steel |
| CN116217248A (en) * | 2022-12-02 | 2023-06-06 | 河钢乐亭钢铁有限公司 | Low-cost long-life slag blocking wall with hit package and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100339170C (en) * | 2005-10-14 | 2007-09-26 | 河北理工大学 | Dry type working liner material for erosion resistance continuous casting tundish |
-
1991
- 1991-04-12 CN CN 91102229 patent/CN1029474C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045281C (en) * | 1993-09-03 | 1999-09-29 | 中国科学院上海硅酸盐研究所 | Silicon nitride combined with silicon carbide refractory material for pouring ladle gate |
| CN1045282C (en) * | 1993-09-03 | 1999-09-29 | 中国科学院上海硅酸盐研究所 | High-compact low-porosity silicon nitride-silicon carbide-oxide system as refractory material |
| CN100455544C (en) * | 2006-09-05 | 2009-01-28 | 杨德报 | Fire resisting plate and its preparation method |
| CN101367636B (en) * | 2008-09-27 | 2012-07-04 | 武汉科技大学 | Light heat-insulating plate and manufacturing method therefor |
| CN101544506B (en) * | 2009-04-17 | 2011-09-14 | 陈红良 | Raw material formula of tundish insulating board and preparation method for tundish insulating board |
| CN102181962A (en) * | 2010-09-30 | 2011-09-14 | 南京理工大学 | Method for preparing thin-diameter zirconium oxide fibers and fiber board thereof |
| CN102181962B (en) * | 2010-09-30 | 2013-01-02 | 南京理工大学 | Method for preparing thin-diameter zirconium oxide fibers and fiber board thereof |
| CN105414460A (en) * | 2015-11-23 | 2016-03-23 | 合肥李诺新材料贸易有限公司 | High-pouring-precision composite modified sodium silicate-bonded sand for pump valve casting and preparation method thereof |
| CN109020581A (en) * | 2018-09-21 | 2018-12-18 | 成都尚威耐火材料有限公司 | A kind of casting tundish composite dry material and preparation method thereof |
| CN109020581B (en) * | 2018-09-21 | 2021-02-05 | 成都尚威耐火材料有限公司 | Smelting and casting tundish composite dry material and preparation method thereof |
| CN116217248A (en) * | 2022-12-02 | 2023-06-06 | 河钢乐亭钢铁有限公司 | Low-cost long-life slag blocking wall with hit package and preparation method thereof |
| CN116023159A (en) * | 2022-12-21 | 2023-04-28 | 南京钢铁股份有限公司 | Fiber reinforced magnesia dry material for tundish for smelting variety steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1029474C (en) | 1995-08-09 |
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