CN102719622B - Method for recycle of steel-making casting-remnant heat-state steel slag - Google Patents
Method for recycle of steel-making casting-remnant heat-state steel slag Download PDFInfo
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- CN102719622B CN102719622B CN201110077895.5A CN201110077895A CN102719622B CN 102719622 B CN102719622 B CN 102719622B CN 201110077895 A CN201110077895 A CN 201110077895A CN 102719622 B CN102719622 B CN 102719622B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The invention discloses a method for recycle of steel-making casting-remnant heat-state steel slag. The method is characterized in that: continuous casting of molten steel is carried out in a tundish after finish rolling by converter taping. The casting-remnant steel slag is recycled after molten steel in a molten steel can is added in tundish during continuous casting. The molten steel is infunded in the molten steel can with the same casting times and the same steel grades after finery is finished. The molten steel can having infunded casting-remnant steel slag is suspended to a continuous casting station by a crane and carried out casting. The method in the invention reduces odds of affecting quality of casting blanks caused by steel slag entering the tundish and fluctuation of quality of continuous casting blanks because of exchange of cans and improves quality of continuous casting blanks and ingot rate of molten steel. The method reclaims sensible heat of steel slag, reduces consumption of energy and improves the yielding rate of metal simultaneously.
Description
Technical field
The present invention relates to a kind of steel-making and note the method that afterheat-state slag recycles, belong to steel-making continuous casting production technical field.
Background technology
Converter steelmaking is that the elements such as the carbon in molten iron, silicon, manganese, phosphorus, sulphur are removed, reach composition and temperature meets the demands simultaneously, the quantity of slag of 5 kilograms of steel per ton of having an appointment in the time of converter tapping enters in ladle, in refining treatment process, may also to add slag charge to process, therefore in the ladle finishing in refining, the slag that 50～100mm is thick will be had, molten steel, after refining unit (LF, RH, ANS etc.) is processed, transports continuous caster to and pours into a mould.
Molten steel by ladle in the process of basket pouring, along with the decline of cast later stage liquid steel level, can produce conflux vortex, and grow in intensity, promote the emulsification of slag steel, slag is flow to into tundish with steel.Conflux vortex is in container drainage process, and liquid is vertical decline first, and while dropping to certain altitude, liquid just starts to collect to tap hole center line, and forms recessed whirlpool on slag blanket surface.It is indefinite to cruise in the position, recessed whirlpool just having produced, and now desulphurization starts fuzzyly, and slag particle starts emulsification and enter in molten steel, but now because position, recessed whirlpool is compared with high and can not make slag flow to water inlet with steel.Along with the further decline of liquid level, recessed whirlpool is more and more obvious, and swirl velocity is also increasing, until connect the mouth of a river, a large amount of slags has entered the mouth of a river.Therefore when the molten steel in ladle is substantially emptying, to close in time ladle nozzle, to stop the slag in ladle to enter in continuous casting tundish, if entering tundish, slag is just easily involved in crystallizer by molten steel, increase the probability that slag enters strand, if the oxidisability of slag is high in addition, can cause the scaling loss of oxidizable element in molten steel, cause molten steel composition fluctuation, and then affect the quality of cleanliness factor and the steel billet of molten steel.In the time that the surplus steel amount of ladle is 0.5 ton of left and right, ladle just there will be lower slag phenomenon, now will stop immediately to water, and the remaining slag of unavoidable generation note in ladle, mainly comprises hot steel slag and a small amount of molten steel of not noted more than note.Under present circumstances, be to pour these residual steel and residue into slag ladle, transport slag processing factory to, through after a series of processing, could again be utilized.
Chinese patent (patent No.: ZL200610012345.4) discloses one and has watered remaining slag recycling method, will water remaining slag to pour in sky ladle, by the ladle that fills slag at converter tapping, its objective is and reduce LF refining process slag former and power consumption, realize resource reutilization, reduce the pollution of slag to environment.
Above method exists following shortcoming:
1. in casting process, in order to improve the billet yield of molten steel, molten steel in each ladle will pour into tundish as much as possible, so just increase the probability of slag under ladle, the probability that strand produces slag inclusion, is mingled with can be increased, if the oxidisability of slag is high in addition, the scaling loss of oxidizable element in molten steel can be caused, cause molten steel composition fluctuation, and then affect the quality of cleanliness factor and the steel billet of molten steel.Production practice also show, owing to changing tank, steel quality is had to impact greatly, because transition base (continuously cast bloom that two tank molten steel form at the tundish mixing portion) quality of changing tank production is starkly lower than the quality of normal base, especially to the very strict steel grade of specification of quality, because lower slag causes continuous casting billet quality fluctuation, continuously cast bloom is demoted use and is caused huge loss;
2. residual molten steel in ladle, has increased the consumption of iron and steel stock;
3. residual molten steel and slag in ladle, is hot steel slag, and its heat is underutilized;
4. in ladle, residual steel is not directly recycled.
Summary of the invention
The invention provides a kind of method that afterheat-state slag recycles of noting of making steel, continuous casting is noted to afterheat-state slag to be poured in the same ladle watering after inferior refining below finishes, the more important thing is, the working method that adopts steel-making note afterheat-state slag to recycle, under ladle, before slag, stop watering, greatly reduce the probability that slag enters tundish and then affects slab quality, alleviated owing to changing the impact of tank on steel quality fluctuation, especially required strict steel grade highly beneficial to steel product quality.Note afterheat-state slag recycles, and heat energy, the residual steel of continuous casting note afterheat-state slag are fully used.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of method that afterheat-state slag recycles of noting of making steel, this processing method is that molten steel is after converter tapping, finished to Tundish Connection by refining, ladle molten steel injects after tundish at continuous casting, the slag that note is remaining recycles, pour that same after finishing of refining (RH or LF) watered time into, in the ladle of same steel grade, then the ladle crane that is introduced into the remaining slag of note is winched to continuous casting station pour into a mould, to improve quality and the molten steel billet yield of continuously cast bloom.
Concrete technical scheme is as follows:
1). record the thickness of slag layer of refining process ladle, to preparing to carry out the tank that slag recycles, thickness of slag layer≤100mm;
2). continuous casting injects tundish by the molten steel in ladle in producing, be 3～5 ton hours at ladle Metal Weight, Metal in Tundish is carried out to thermometric, in the time of superheating temperature >=20 DEG C (superheating temperature refers to that liquid steel temperature deducts the difference of this steel grade liquidus temperature), this tank is that 0.8～1.0 ton hour stops cast (while stopping pouring into a mould, the surplus steel amount of ladle is 0.5 ton in the past) in molten steel amount;
3). with crane, the note afterheat-state slag in ladle is poured into samely water time, in the ladle of same steel grade refining (RH or LF) after finishing.Recycle design: the first tank is back in the 3rd tank, the second tank is back in the 4th tank, N tank is back in N+2 tank;
4). use note afterheat-state slag circulation time, finished to the timed interval≤15min in the ladle of pouring into after refining finishes by ladle cast, to ensure more than the note in ladle that slag injects in the ladle after refining (RH or LF) finishes smoothly;
5). the note afterheat-state slag in ladle is poured into samely water time, after the ladle of same steel grade refining (RH or LF) after finishing, to argon blowing quantity for steel ladle 1～3min, argon flow amount is 10～30Nm
3/ h, with the composition in even ladle and temperature.
6). the ladle after refining (RH or LF) finishes is pouring into before note afterheat-state slag, ladle headroom >=400mm, otherwise do not recycle.
7). repeat next circulating process process, note afterheat-state slag recycles number of times≤3 time, pours slag into slag ladle after exceeding 3 times, transports slag processing factory and office reason to.
In the time of the method that adopts note afterheat-state slag to recycle, if just in case while occurring that a certain tank steel tundish composition exceedes the ingredient standard of this steel grade, this tank steel hot steel slag must not recycle, preventing that tank to accepting slag from producing pollutes.
For the tank that does not meet above-mentioned processing condition, by normal running processing, the method that does not adopt slag to recycle.
The present invention's beneficial effect compared with prior art:
1). steel-making note afterheat-state slag recycle can ladle than the normal heat of producing approximately in advance 0.5 ton stop watering (ladle in, remaining approximately 1 ton of steel), so just greatly reduce the probability that slag enters tundish and then affects slab quality, alleviate due to the fluctuation of changing the continuous casting billet quality that tank causes, especially highly beneficial to the strict steel grade of specification of quality;
2). steel-making note afterheat-state slag recycles and adds refining to finish rear heat, has reclaimed the sensible heat of slag, has reduced the consumption of the energy;
3). steel-making note afterheat-state slag recycles hot residual steel is recycled, and has improved the recovery rate of iron of steelworks;
4). along with the increase of thickness of slag layer, reduced by the ladle temperature drop causing that dispels the heat, be conducive to keep the stable of liquid steel temperature;
5). reduce production cost, remarkable in economical benefits.
Embodiment
The method that the note afterheat-state slag of making steel recycles, its preferred forms is as follows:
1). record the thickness of slag layer of refining process ladle, to preparing to carry out the tank that slag recycles, thickness of slag layer≤100mm;
2). continuous casting injects tundish by the molten steel in ladle in producing, be 5 ton hours at ladle Metal Weight, Metal in Tundish is carried out to thermometric, in the time of superheating temperature >=20 DEG C (superheating temperature refers to that liquid steel temperature deducts the difference of this steel grade liquidus temperature), this tank is that 1 ton hour stops cast (while stopping pouring into a mould, the surplus steel amount of ladle is 0.5 ton in the past) in molten steel amount;
3). with crane, the note afterheat-state slag in ladle is poured into samely water time, in the ladle of same steel grade refining (RH or LF) after finishing.Recycle design: the first tank is back in the 3rd tank, the second tank is back in the 4th tank, N tank is back in N+2 tank;
4). use note afterheat-state slag circulation time, finished to the timed interval≤15min in the ladle of pouring into after refining finishes by ladle cast, to ensure more than the note in ladle that slag injects in the ladle after refining (RH or LF) finishes smoothly;
5). the note afterheat-state slag in ladle is poured into samely water time, after the ladle of same steel grade refining (RH or LF) after finishing, to argon blowing quantity for steel ladle 2min, argon flow amount is 20Nm
3/ h, with the composition in even ladle and temperature;
6). the ladle after refining (RH or LF) finishes is pouring into before note afterheat-state slag, ladle headroom >=400mm, otherwise do not recycle;
7). repeat next circulating process process, it is 3 times that note afterheat-state slag recycles number of times, pours slag into slag ladle after exceeding 3 times, transports slag processing factory and office reason to.
In the time of the method that adopts note afterheat-state slag to recycle, if just in case while occurring that a certain tank steel tundish composition exceedes the ingredient standard of this steel grade, this tank steel hot steel slag must not recycle, preventing that tank to accepting slag from producing pollutes.
For the tank that does not meet above-mentioned processing condition, by normal running processing, the method that does not adopt slag to recycle.
Recycle after three times by note afterheat-state slag, will pour slag ladle into the slag of 1 ton of molten steel, transport slag processing factory and office reason to.Now lost 1 ton of molten steel, and poured the slag containing 0.5 ton of molten steel into slag ladle at every turn, will lose molten steel amount for three times is 1.5 tons, and can save like this molten steel amount is 0.5 ton, therefore, has improved the billet yield of molten steel.
Claims (1)
1. make steel the method that note afterheat-state slag recycles for one kind, it is characterized in that: molten steel is after converter tapping, finished to Tundish Connection by refining, ladle molten steel injects after tundish at continuous casting, under large tank, before slag, stop watering, slag remaining note is recycled, and same after pouring refining furnace into and finishing watered time, in the ladle of same steel grade, then the ladle crane that is introduced into the remaining slag of note is winched to continuous casting station pours into a mould; Concrete steps are:
1). record the thickness of slag layer of refining process ladle, to preparing to carry out the tank that slag recycles, thickness of slag layer≤100mm;
2). continuous casting injects tundish by molten steel in ladle in producing, and is 3～5 ton hours at ladle Metal Weight, and Metal in Tundish is carried out to thermometric, and in the time of superheating temperature >=20 DEG C, this tank is that 0.8～1.0 ton hour stops cast in molten steel amount;
3). with crane, the note afterheat-state slag in ladle is poured into samely water time, in the ladle of same steel grade refining after finishing, Recycle design: the first tank is back in the 3rd tank, the second tank is back in the 4th tank, N tank is back in N+2 tank;
4). use note afterheat-state slag circulation time, finished to the timed interval≤15min in the ladle of pouring into after refining finishes by ladle cast;
5). the note afterheat-state slag in ladle is poured into samely water time, after the ladle of same steel grade refining after finishing, to argon blowing quantity for steel ladle 1～3min that molten steel is housed, argon flow amount is 10～30Nm
3/ h;
6). the ladle after refining finishes is pouring into before note afterheat-state slag, ladle headroom >=400mm, otherwise do not recycle;
7). repeat next circulating process process, note afterheat-state slag recycles number of times≤3 time, pours slag into slag ladle after exceeding 3 times, transports slag processing factory and office reason to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110077895.5A CN102719622B (en) | 2011-03-29 | 2011-03-29 | Method for recycle of steel-making casting-remnant heat-state steel slag |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110077895.5A CN102719622B (en) | 2011-03-29 | 2011-03-29 | Method for recycle of steel-making casting-remnant heat-state steel slag |
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| CN102719622A CN102719622A (en) | 2012-10-10 |
| CN102719622B true CN102719622B (en) | 2014-11-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108655383A (en) * | 2017-03-29 | 2018-10-16 | 鞍钢股份有限公司 | A kind of high efficiente callback breakage hot-metal bottle residual heat system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106811576B (en) * | 2015-12-02 | 2019-01-04 | 鞍钢股份有限公司 | A kind of hot circulation utilization method of vessel slag |
| CN107858485A (en) * | 2017-10-20 | 2018-03-30 | 芜湖新兴铸管有限责任公司 | Refine the circulation utilization method of warm sludge |
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| CN101403021A (en) * | 2008-11-08 | 2009-04-08 | 山西太钢不锈钢股份有限公司 | Utilization method for steel scoria |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108655383A (en) * | 2017-03-29 | 2018-10-16 | 鞍钢股份有限公司 | A kind of high efficiente callback breakage hot-metal bottle residual heat system and method |
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| CN102719622A (en) | 2012-10-10 |
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