CN101607827A - Steel ladle using casting material prefabricated lower casting nozzle brick and production method thereof - Google Patents
Steel ladle using casting material prefabricated lower casting nozzle brick and production method thereof Download PDFInfo
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- CN101607827A CN101607827A CNA2009100654724A CN200910065472A CN101607827A CN 101607827 A CN101607827 A CN 101607827A CN A2009100654724 A CNA2009100654724 A CN A2009100654724A CN 200910065472 A CN200910065472 A CN 200910065472A CN 101607827 A CN101607827 A CN 101607827A
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Abstract
The present invention relates to a kind of steel ladle using casting material prefabricated lower casting nozzle brick and production method thereof, material composition by weight percentage, containing granularity is the corundum 27～30% of 5-3mm, the corundum 22～24% of 3-1mm, the corundum 20～22% of 1-0mm, also contains corundum 15～18%, the α-Al of 44 μ m
2O
3Powder 5～8%, pure calcium aluminate cement 3～8%; Add the water that accounts for above-mentioned raw materials gross weight 4～6%, 0.2～0.5% additive.Production stage comprises: weighing, stir discharging; The lower casting nozzle brick box hat is fixed in the mould, pours into a mould, through vibratory compaction, the demoulding then; Drying is 3～5 days under 15-25 ℃ of temperature, dries by the requirement that heats up in dry kiln then.Product of the present invention after testing, apparent porosity≤20%, volume density 〉=3.0g/cm
3, cold crushing strength 〉=30MPa, long service life; Production process is simplified simultaneously, has reduced production cost.Therefore, the present invention will have good popularization value and social benefit.
Description
One, technical field:
The present invention relates to a kind of refractory materials, particularly relate to a kind of steel ladle using casting material prefabricated lower casting nozzle brick and production method thereof.
Two, background technology:
The lower casting nozzle brick that the steelworks ladle uses adopts half-dried material mechanical pressing method usually, technologies such as general drying, encapsulation box hat and secondary drying are made, and its operational path is roughly through preparing burden, mix, ageing mixture, moulding, drying, add steps such as box hat, secondary drying, packing and warehouse-in.Adopt the density variation at each position, lower casting nozzle brick upper, middle and lower of mechanical pressing obvious, the internal stress of being heated in use effect tends to crack, may Yin Fa Seepage steel, security incident such as bleed-out.Fill with the ooze material in lower casting nozzle brick and the slit between the suit box hat that this method is produced; When secondary drying, the pug synersis, the bonding strength between box hat and the adobe descends, and influences the work-ing life of product, has increased the production cost of steel-making continuous casting, also brings hidden danger to safety in production simultaneously.
By retrieval, the patent No. a kind of production method of composite corundum carbon brick for ladle that has been 200710092409.0 patent disclosure, proportioning raw materials is as follows: sub-white corundum 35-40%, electrosmelted magnesite clinker 25-35%, electric smelting aluminum-spinel 10-15%, graphite 6-7%, aluminium powder 1-2%, silica flour 1-3%, carborundum powder 3-5%, aluminum oxide powder 3-5%, resin 3.5-3.8%.Its production process is: spice-packing compact forming-cool base-baking-pick warehouse-in.The composite corundum carbon brick for ladle that adopts this method to produce is the common brick of using of ladle, and prescription is complicated, is not suitable for use in the ladle lower casting nozzle brick.
Three, summary of the invention:
The technical problem to be solved in the present invention: with the deficiency that brick exists, provide that a kind of operation is simple, production cost is low, the steel ladle casting vibratory compaction lower casting nozzle brick and the production method thereof of dependable performance at existing ladle.
Technical scheme of the present invention is:
A kind of Refractory Carstables for Ladles prefabricated lower casting nozzle brick, this brick material composition by weight percentage, containing granularity is the corundum 27～30% of 5-3mm, the corundum 22～24% of 3-1mm, the corundum 20～22% of 1-0mm, also contains corundum 15～18%, the α-Al of 44 μ m
2O
3Powder 5～8%, pure calcium aluminate cement 3～8%; Add the water that accounts for above-mentioned raw materials gross weight 4～6%, 0.2～0.5% additive.
Described α-Al
2O
3The powder degree is 5 μ m, Al
2O
3Content 〉=80%; Described pure calcium aluminate cement granularity is 44 μ m.
Described additive is the mixture of Sodium hexametaphosphate 99 and tripoly phosphate sodium STPP, and the weight ratio of the two is 2～1: 1.
Described corundum is fused corundom or plate diamond spar.
A kind of described Refractory Carstables for Ladles comprises following production stage with the production method of prefabricated lower casting nozzle brick:
(1) spice: press raw material and form weighing, under agitation in stirrer, add various corundum and additive, do and mix 3～5min; Add water then while stirring, wet mixing 3～5min; Add α-Al again
2O
3Powder, pure calcium aluminate cement stir 8～10min, discharging;
(2) vibratory compaction: the lower casting nozzle brick box hat is fixed in the mould, injects slip and pour into a mould, through vibratory compaction, the demoulding then;
(3) drying: drying is 3～5 days under 15-25 ℃ temperature;
(4) oven dry: in dry kiln, dry.
The intensification of described oven dry requires as follows: from room temperature～200 ℃, temperature rise rate is 5.2～5.8 ℃/h; At 200 ± 10 ℃, dry 12h; From 200～300 ℃, temperature rise rate is 5.6～6.8 ℃/h; At 300 ± 10 ℃, dry 8h; From 300～400 ℃, temperature rise rate is 5.5～6.8 ℃/h; At 400 ± 10 ℃, dry 8h, kiln discharge.
The rotating speed of described stirring is 40～60r/min.
Described shaking table power is 5KW, and earlier with shaking table vibration 3～5min, amplitude 2～5mm is then with vibrating head vibration 3～5min during vibration.
Positive beneficial effect of the present invention:
(1) steel ladle using casting material prefabricated lower casting nozzle brick of the present invention, after testing, Fe wherein
2O
3≤ 1%, Al
2O
3〉=80%, SiO
2≤ 1%, apparent porosity≤20%, volume density 〉=3.0g/cm
3, cold crushing strength 〉=30MPa, long service life.Lower casting nozzle brick work-ing life of ordinary process moulding only 1～2 time, product of the present invention work-ing life is 3～4 times, can satisfy the production needs fully, and the specific performance index sees the following form 1.
Table 1: the performance index of product of the present invention
(2) the present invention compares with prior art, production process is obviously simplified, three road master operations such as production process of the present invention has been saved the pug ageing mixture, added box hat, secondary drying, do not need ageing mixture behind the batch mixing, can box hat and adobe be fixed as one directly by cast vibratory compaction, fundamentally stop the loosening phenomenon of box hat and adobe, thoroughly solved the loosening and quality accident problem that causes of ladle box hat when watering steel and use, the safety coefficient when having increased steel mill's steel-making continuous casting; Because production process is simplified, and has significantly reduced the production cycle, has alleviated working strength of workers, has improved efficiency, has reduced production cost.Production method of the present invention has also solved the production problem of some special shaped brick shapes, difficult moulding.
(3) the inventive method technology is simple, and production cost is low, is easy to go into operation, and has excellent generalization values and social benefit.
Four, embodiment:
The present invention is further illustrated below in conjunction with embodiment.
Embodiment one: a kind of Refractory Carstables for Ladles prefabricated lower casting nozzle brick, the raw material composition sees Table corresponding data in 2, with the 100kg raw material is example, and wherein granularity is corundum 20kg, corundum 15kg, the α-Al of 44 μ m of corundum 22kg, 1-0mm of corundum 27kg, the 3-1mm of 5-3mm
2O
3Powder 8kg, pure calcium aluminate cement 8kg; Add water 4.5kg, additive 0.5kg.
α-Al in the table
2O
3The powder degree is 5 μ m, and cement is the pure calcium aluminate of granularity 44 μ m, and additive is the mixture of Sodium hexametaphosphate 99 and tripoly phosphate sodium STPP, and the two weight ratio is 2: 1.
Production method comprises the steps:
(1) spice: press raw material and form weighing, under agitation in stirrer, add plate diamond spar, additive, do and mix 3～5min; Add water then while stirring, wet mixing 3～5min; Add α-Al again
2O
3Powder, pure calcium aluminate cement stir 8～10min, discharging; Rotating speed is 40-60r/min during stirring;
(2) vibratory compaction: the lower casting nozzle brick box hat is fixed in the mould, opens shaking table, constantly inject slip and pour into a mould, pouring speed should compare evenly; Through vibratory compaction, the demoulding then;
Wherein shaking table power is 5KW, vibrates 3-5min, amplitude range 2-5mm at shaking table earlier during vibration; Vibrate 3-5min with vibrating head then; Used vibration table surface is 1000mm * 1000mm, load-bearing 500kg;
(3) drying: temperature is advisable with 15-25 ℃ when dry, and maintenance is one day in the brick phantom of cast back, and the proper extension curing time is answered in the outer maintenance of mould three days when temperature is low slightly;
(4) oven dry: in dry kiln, dry.
Heating up during oven dry, it is as follows to require: from room temperature～200 ℃, temperature rise rate is 5.2～5.8 ℃/h; At 200 ± 10 ℃, dry 12h; From 200～300 ℃, temperature rise rate is 5.6～6.8 ℃/h; At 300 ± 10 ℃, dry 8h; From 300～400 ℃, temperature rise rate is 5.5～6.8 ℃/h; At 400 ± 10 ℃, dry 8h, kiln discharge.The performance perameter of finished bricks sees Table 1, and appearance requirement sees Table 3.
Embodiment two: the raw material composition sees Table corresponding data in 2, is with embodiment one difference:
The weight ratio of Sodium hexametaphosphate 99 and tripoly phosphate sodium STPP is 2: 1 in the additive therefor.
Production method comprises the steps:
(1) spice: press raw material and form weighing, under agitation in stirrer, add plate diamond spar, additive, do and mix 3～4min; Add water then while stirring, wet mixing 3～4min; Add α-Al again
2O
3Powder, pure calcium aluminate cement stir 8～9min, discharging; Rotating speed is 40-50r/min during stirring;
(2) vibratory compaction: the lower casting nozzle brick box hat is fixed in the mould, opens shaking table, constantly inject slip and pour into a mould, through vibratory compaction, the demoulding then; Wherein shaking table power is 5KW, vibrates 3～4min, amplitude range 2-5mm at shaking table earlier during vibration; Vibrate 3-4min with vibrating head then;
(3) drying: drying is 3～4 days under 20-25 ℃ temperature;
(4) oven dry: in dry kiln, dry.
Heating up during oven dry, it is as follows to require: from room temperature～200 ℃, temperature rise rate is 5.6 ℃/h; At 200 ± 10 ℃, dry 12h; From 200～300 ℃, temperature rise rate is 6.2 ℃/h; At 300 ± 10 ℃, dry 8h; From 300～400 ℃, temperature rise rate is 6.2 ℃/h; At 400 ± 10 ℃, dry 8h, kiln discharge.
Embodiment three: the raw material composition sees Table corresponding data in 2, is with embodiment one difference:
The weight ratio of Sodium hexametaphosphate 99 and tripoly phosphate sodium STPP is 1.5: 1 in the additive therefor.
Production method comprises the steps:
(1) spice: press raw material and form weighing, under agitation in stirrer, add plate diamond spar, additive, do and mix 4min; Add water then while stirring, wet mixing 4min; Add α-Al again
2O
3Powder, pure calcium aluminate cement stir 9min, discharging; Rotating speed is 60r/min during stirring;
(2) vibratory compaction: the lower casting nozzle brick box hat is fixed in the mould, opens shaking table, constantly inject slip and pour into a mould, through vibratory compaction, the demoulding then; Wherein shaking table power is 5KW, vibrates 4min, amplitude range 4mm at shaking table earlier during vibration; Vibrate 4min with vibrating head then;
(3) drying: drying is 3 days under 25 ℃ temperature;
(4) oven dry: in dry kiln, dry.
Heating up during oven dry, it is as follows to require: from room temperature～200 ℃, temperature rise rate is 5.4 ℃/h; At 200 ± 10 ℃, dry 12h; From 200～300 ℃, temperature rise rate is 6.0 ℃/h; At 300 ± 10 ℃, dry 8h; From 300～400 ℃, temperature rise rate is 5.8 ℃/h; At 400 ± 10 ℃, dry 8h, kiln discharge.
Embodiment four: the raw material composition sees Table corresponding data in 2, is with embodiment one difference:
The weight ratio of Sodium hexametaphosphate 99 and tripoly phosphate sodium STPP is 1.8: 1 in the additive therefor.
Production method comprises the steps:
(1) spice: press raw material and form weighing, under agitation in stirrer, add fused corundom, additive, do and mix 3min; Add water then while stirring, wet mixing 5min; Add α-Al again
2O
3Powder, pure calcium aluminate cement stir 8min, discharging; Rotating speed is 50r/min during stirring;
(2) vibratory compaction: the lower casting nozzle brick box hat is fixed in the mould, opens shaking table, constantly inject slip and pour into a mould, through vibratory compaction, the demoulding then; Wherein shaking table power is 5KW, vibrates 3-5min, amplitude range 2-5mm at shaking table earlier during vibration; Vibrate 3-5min with vibrating head then;
(3) drying: drying is 3～5 days under 15-25 ℃ temperature;
(4) oven dry: in dry kiln, dry.
Heating up during oven dry, it is as follows to require: from room temperature～200 ℃, temperature rise rate is 5.6 ℃/h; At 200 ± 10 ℃, dry 12h; From 200～300 ℃, temperature rise rate is 6.2 ℃/h; At 300 ± 10 ℃, dry 8h; From 300～400 ℃, temperature rise rate is 6.5 ℃/h; At 400 ± 10 ℃, dry 8h, kiln discharge.
Embodiment five～12: the raw material composition sees Table corresponding data in 2, and wherein the ratio of mixture of additive Sodium hexametaphosphate 99 and tripoly phosphate sodium STPP is 1.2: 1 in the example five; The weight ratio of additive Sodium hexametaphosphate 99 and tripoly phosphate sodium STPP is 1: 1 in the example six; Contents such as production method are with embodiment one.
The contents such as production stage of example seven～12 no longer repeat with embodiment one.
Table 2: raw material and proportioning thereof (by weight percentage) among each embodiment
Table 3: the appearance requirement of finished product brick of the present invention, unit: mm
| Project | Index |
| Permissible variation in dimension | ????≤1 |
| Distortion | Being forbidden has |
| Depth of the damaged vertex | ????≤3 |
| Depth of the damage edge | ????≤2 |
| Crackle | Being forbidden has |
| Relative variation (wide, thick) | ????≤0.5 |
| Pitted skin | Being forbidden has |
| The section slabbing | Being forbidden has |
Annotate: gauge permissible variation ± 0.5mm.
Claims (8)
1, a kind of Refractory Carstables for Ladles prefabricated lower casting nozzle brick, it is characterized in that: this brick material composition by weight percentage, containing granularity is the corundum 27～30% of 5-3mm, the corundum 22～24% of 3-1mm, the corundum 20～22% of 1-0mm, also contains corundum 15～18%, the α-Al of 44 μ m
2O
3Powder 5～8%, pure calcium aluminate cement 3～8%; Add the water that accounts for above-mentioned raw materials gross weight 4～6%, 0.2～0.5% additive.
2, Refractory Carstables for Ladles prefabricated lower casting nozzle brick according to claim 1 is characterized in that: described α-Al
2O
3The powder degree is 5 μ m, Al
2O
3Content 〉=80%; Described pure calcium aluminate cement granularity is 44 μ m.
3, Refractory Carstables for Ladles prefabricated lower casting nozzle brick according to claim 1 is characterized in that: described additive is the mixture of Sodium hexametaphosphate 99 and tripoly phosphate sodium STPP, and the weight ratio of the two is 2～1: 1.
4, Refractory Carstables for Ladles prefabricated lower casting nozzle brick according to claim 1 is characterized in that: described corundum is fused corundom or plate diamond spar.
5, the described Refractory Carstables for Ladles of a kind of claim 1 production method of prefabricated lower casting nozzle brick is characterized in that this method comprises following production stage:
(1) spice: press raw material and form weighing, under agitation in stirrer, add various corundum and additive, do and mix 3～5min; Add water then while stirring, wet mixing 3～5min; Add α-Al again
2O
3Powder, pure calcium aluminate cement stir 8～10min, discharging;
(2) vibratory compaction: the lower casting nozzle brick box hat is fixed in the mould, opens shaking table, constantly inject slip and pour into a mould, through vibratory compaction, the demoulding then;
(3) drying: drying is 3～5 days under 15-25 ℃ temperature;
(4) oven dry: in dry kiln, dry.
6, Refractory Carstables for Ladles according to claim 5 is with the production method of prefabricated lower casting nozzle brick, and it is characterized in that: the intensification of described oven dry requires as follows: from room temperature～200 ℃, temperature rise rate is 5.2～5.8 ℃/h; At 200 ± 10 ℃, dry 12h; From 200～300 ℃, temperature rise rate is 5.6～6.8 ℃/h; At 300 ± 10 ℃, dry 8h; From 300～400 ℃, temperature rise rate is 5.5～6.8 ℃/h; At 400 ± 10 ℃, dry 8h, kiln discharge.
7, the Refractory Carstables for Ladles according to claim 5 production method of prefabricated lower casting nozzle brick, it is characterized in that: the rotating speed of described stirring is 40～60r/min.
8, the Refractory Carstables for Ladles according to claim 5 production method of prefabricated lower casting nozzle brick, it is characterized in that: described shaking table power is 5KW, earlier with shaking table vibration 3～5min, amplitude 2～5mm is then with vibrating head vibration 3～5min during vibration.
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|---|---|---|---|
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| CN101607827B CN101607827B (en) | 2012-07-04 |
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| CN102249719A (en) * | 2011-06-24 | 2011-11-23 | 郑州振东耐磨材料有限公司 | Light-burning corundum precast block for refining steel ladle |
| CN102329139A (en) * | 2011-07-22 | 2012-01-25 | 郑州京华耐火材料实业有限公司 | Integrally cast calcium carbide furnace door |
| CN102329140A (en) * | 2011-07-22 | 2012-01-25 | 郑州京华耐火材料实业有限公司 | Joint material for hot-blast air pipeline of blast furnace |
| CN102503471A (en) * | 2011-10-26 | 2012-06-20 | 河南省耕生耐火材料有限公司 | Corundum preform added with elemental silicon |
| CN103613398A (en) * | 2013-12-10 | 2014-03-05 | 武汉钢铁(集团)公司 | Castable for ladle collector nozzle adopting corundum collector nozzle reclaimed material as aggregate and preparation method of castable |
| CN106986656A (en) * | 2017-06-03 | 2017-07-28 | 嘉兴新耐建材有限公司 | A kind of limekiln resistive connection skin abrasion-resistant prefabricated brick |
| CN107010975A (en) * | 2017-06-03 | 2017-08-04 | 嘉兴新耐建材有限公司 | A kind of limekiln resistive connection skin wear-resistant castable |
| CN107141000A (en) * | 2017-06-03 | 2017-09-08 | 嘉兴新耐建材有限公司 | A kind of resistive connection skin wear-resistant castable |
| CN107382333A (en) * | 2017-06-28 | 2017-11-24 | 常州莱尚纺织品有限公司 | A kind of preparation method of anti-slag pouring materialfor steel ladle |
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| CN1191209C (en) * | 2003-05-24 | 2005-03-02 | 北京科技大学 | Silicon nitride corundum casting refractory material for ironmaking blast furnace |
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| CN102249719A (en) * | 2011-06-24 | 2011-11-23 | 郑州振东耐磨材料有限公司 | Light-burning corundum precast block for refining steel ladle |
| CN102249719B (en) * | 2011-06-24 | 2013-03-06 | 郑州振东科技有限公司 | Light-burning corundum precast block for refining steel ladle |
| CN102329139A (en) * | 2011-07-22 | 2012-01-25 | 郑州京华耐火材料实业有限公司 | Integrally cast calcium carbide furnace door |
| CN102329140A (en) * | 2011-07-22 | 2012-01-25 | 郑州京华耐火材料实业有限公司 | Joint material for hot-blast air pipeline of blast furnace |
| CN102503471A (en) * | 2011-10-26 | 2012-06-20 | 河南省耕生耐火材料有限公司 | Corundum preform added with elemental silicon |
| CN103613398A (en) * | 2013-12-10 | 2014-03-05 | 武汉钢铁(集团)公司 | Castable for ladle collector nozzle adopting corundum collector nozzle reclaimed material as aggregate and preparation method of castable |
| CN103613398B (en) * | 2013-12-10 | 2016-04-27 | 武汉钢铁(集团)公司 | Collector nozzle of ladle mould material being aggregate with mouth of a river reclaimed materials under corundum and preparation method thereof |
| CN106986656A (en) * | 2017-06-03 | 2017-07-28 | 嘉兴新耐建材有限公司 | A kind of limekiln resistive connection skin abrasion-resistant prefabricated brick |
| CN107010975A (en) * | 2017-06-03 | 2017-08-04 | 嘉兴新耐建材有限公司 | A kind of limekiln resistive connection skin wear-resistant castable |
| CN107141000A (en) * | 2017-06-03 | 2017-09-08 | 嘉兴新耐建材有限公司 | A kind of resistive connection skin wear-resistant castable |
| CN107382333A (en) * | 2017-06-28 | 2017-11-24 | 常州莱尚纺织品有限公司 | A kind of preparation method of anti-slag pouring materialfor steel ladle |
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|---|---|
| CN101607827B (en) | 2012-07-04 |
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