CN102719622A - 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 PDF

Info

Publication number
CN102719622A
CN102719622A CN2011100778955A CN201110077895A CN102719622A CN 102719622 A CN102719622 A CN 102719622A CN 2011100778955 A CN2011100778955 A CN 2011100778955A CN 201110077895 A CN201110077895 A CN 201110077895A CN 102719622 A CN102719622 A CN 102719622A
Authority
CN
China
Prior art keywords
molten steel
jar
slag
steel
afterheat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2011100778955A
Other languages
Chinese (zh)
Other versions
CN102719622B (en
Inventor
李广帮
廖相巍
曹东
赵刚
万雪峰
贾吉祥
郭庆涛
李德刚
许刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Angang Steel Co Ltd
Original Assignee
Angang Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Angang Steel Co Ltd filed Critical Angang Steel Co Ltd
Priority to CN201110077895.5A priority Critical patent/CN102719622B/en
Publication of CN102719622A publication Critical patent/CN102719622A/en
Application granted granted Critical
Publication of CN102719622B publication Critical patent/CN102719622B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, 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

A kind of method that the afterheat-state slag recycles of annotating of making steel
Technical field
The present invention relates to a kind of steel-making and annotate the method that the afterheat-state slag recycles, belong to the steel-making continuous casting production technical field.
Background technology
Converter steelmaking is that elements such as the carbon in the 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 when converter tapping, having an appointment gets in the molten steel jar, in the refining treatment process, possibly also will add slag charge and handle, and therefore in the molten steel jar that refining finishes, will have the thick slag of 50~100mm; Molten steel transports continuous caster to and pours into a mould after handling through refining unit (LF, RH, ANS etc.).
Molten steel by ladle in the process of basket pouring, the decline along with cast later stage liquid steel level can produce the vortex that confluxes, and grow in intensity, and promotes the emulsification of slag steel, makes slag flow into tundish with steel.The vortex that confluxes is in container current drainage process, and liquid is vertical earlier to descend, and when dropping to certain altitude, liquid just begins to compile to the tap hole center line, and forms recessed whirlpool on the slag blanket surface.It is indefinite to cruise in the position, recessed whirlpool that has just produced, and this moment, slag steel interface began to blur, and slag particle begins emulsification and get in the molten steel, but can not make slag with steel flow into the mouth of a river because position, recessed whirlpool is higher this moment.Along with the further decline of liquid level, recessed whirlpool is more and more obvious, and swirl velocity is also increasing, and until connecting the mouth of a river, a large amount of slags has got into the mouth of a river.Therefore during the basic emptying of the molten steel in ladle, in time close ladle nozzle, enter in the continuous casting tundish to stop the slag in the ladle; If getting into tundish, slag just is involved in mold by molten steel easily; Increased the probability of slag entering strand,, can cause the scaling loss that is prone to the oxidation element in the molten steel if the oxidisability of slag is high in addition; Cause the molten steel composition fluctuation, and then influence the quality of the cleanliness factor and the steel billet of molten steel.When the surplus steel amount of molten steel jar was 0.5 ton of left and right sides, slag phenomenon down will appear in the molten steel jar, and will stop immediately to water this moment, and surplus slag is annotated in unavoidable generation in the ladle, annotates surplus hot steel slag and the small amount of molten steel of not annotated of mainly comprising.Be to pour these residual steel and residue into slag ladle under the present circumstances, transport slag treatment plant to,, could obtain again utilizing through after a series of processing.
Chinese patent (the patent No.: ZL200610012345.4) disclose and a kind ofly water surplus slag and recycle method; Be to water surplus slag to pour in the sky ladle; With 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 environment.
Above method exists following shortcoming:
1. in casting process, in order to improve the billet yield of molten steel, the molten steel in each molten steel jar all will pour into tundish as much as possible; So just increased the probability of slag under the molten steel jar; The probability that strand produces slag inclusion, is mingled with can be increased,, the scaling loss that is prone to the oxidation element in the molten steel can be caused if the oxidisability of slag is high in addition; Cause the molten steel composition fluctuation, and then influence the quality of the cleanliness factor and the steel billet of molten steel.Production practice also show owing to change jar has influence greatly to steel quality; Be starkly lower than the quality of normal base owing to change a jar transition base of producing (two jars of continuously cast blooms that molten steel forms at the tundish mixing portion) quality; Especially to the very strict steel grade of specification of quality; Because slag causes the continuous casting billet quality fluctuation down, continuously cast bloom is demoted use and is caused tremendous loss;
2. residual molten steel in the ladle has increased the consumption of iron and steel stock;
3. residual molten steel and slag in the ladle is hot steel slag, and its heat is underutilized;
4. residual steel is not directly recycled in the ladle.
Summary of the invention
The present invention provides a kind of method that the afterheat-state slag recycles of annotating of making steel; Continuous casting is annotated the afterheat-state slag pour in the same molten steel jar that waters after time refining of back finishes, the more important thing is, adopt steel-making to annotate the working method that the afterheat-state slag recycles; Under the molten steel jar, stop watering before the slag; Significantly reduced the probability that slag gets into tundish and then influence slab quality, alleviated owing to change jar the influence that steel quality is fluctuateed, especially highly beneficial to the strict steel grade of steel product quality.Annotate the afterheat-state slag and recycle, the heat energy, the residual steel that make continuous casting annotate the 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 the afterheat-state slag recycles of annotating of making steel; This process method be molten steel behind converter tapping, finish to the tundish continuous casting by refining, molten steel jar molten steel is after continuous casting injects tundish; Recycle annotating surplus slag; Pour that refining (RH or LF) same after finishing watered time into, in the molten steel jar of same steel grade, will be introduced into the molten steel jar of annotating surplus slag again and winch to the continuous casting station with crane and pour into a mould, to improve the quality and the molten steel billet yield of continuously cast bloom.
Concrete technical scheme is following:
1). the thickness of slag layer of record refining process molten steel jar, to preparing to carry out the jar that slag recycles, thickness of slag layer≤100mm;
2). during continuous casting is produced the molten steel in the molten steel jar is injected tundish; In molten steel jar molten steel weight is 3~5 ton hours; Middle Baogang water is carried out thermometric; When superheating temperature >=20 ℃ (superheating temperature is meant that liquid steel temperature deducts the difference of this steel grade liquidus temperature), this jar is that 0.8~1.0 ton hour stops cast (the surplus steel amount of molten steel jar is 0.5 ton when stopping to pour into a mould in the past) in the molten steel amount;
3). with crane the notes afterheat-state slag in the molten steel jar is poured into samely water time, in the molten steel jar of same steel grade refining (RH or LF) after finishing.Recycle design: first jar be back in the 3rd jar, second jar be back in the 4th jar, the N jar is back in the N+2 jar;
4). use and annotate afterheat-state slag circulation time,, inject smoothly in the molten steel jar after refining (RH or LF) finishes to guarantee the surplus slag of notes in the molten steel jar by the timed interval≤15min in molten steel jar cast end to the molten steel jar of pouring into after refining finishes;
5). the notes afterheat-state slag in the molten steel jar poured into samely water time, behind the molten steel jar of same steel grade refining (RH or LF) after finishing, to molten steel jar Argon 1~3min, argon flow amount is 10~30Nm 3/ h is with composition and the temperature in the even molten steel jar.
6). the molten steel jar after refining (RH or LF) finishes pour into annotate the afterheat-state slag before, ladle headroom >=400mm, otherwise do not recycle.
7). repeat next circulating process process, annotate the afterheat-state slag and recycle number of times≤3 time, pour slag into slag ladle after surpassing 3 times, transport slag treatment plant to and handle.
When adopt annotating the method that the afterheat-state slag recycles,,, prevent the jar of accepting slag produced and pollute then this jar steel hot steel slag must not recycle if just in case when a certain jar of steel tundish composition occurring and surpassing the ingredient standard of this steel grade.
For the jar that does not satisfy above-mentioned processing condition, handle the method that does not adopt slag to recycle by normal running.
The present invention's beneficial effect compared with prior art:
1). steel-making annotate the afterheat-state slag recycle can the molten steel jar than the heat of ordinary production approximately in advance 0.5 ton stop watering (remaining about 1 ton of steel the molten steel jar in); So just significantly reduced the probability that slag gets into tundish and then influences slab quality; Alleviated owing to changing jar fluctuation of the continuous casting billet quality that causes, especially highly beneficial to the strict steel grade of quality;
2). steel-making is annotated the afterheat-state slag and is recycled adding refining end back heat, has reclaimed the sensible heat of slag, has reduced the consumption of the energy;
3). steel-making notes afterheat-state slag recycles and makes hot residual steel obtain reclaiming, and has improved the recovery rate of iron of steelworks;
4). along with the increase of thickness of slag layer, the temperature drop that is caused by the heat radiation of molten steel jar reduces, and helps keeping the stable of liquid steel temperature;
5). reduced production cost, remarkable in economical benefits.
Embodiment
A kind of steel-making annotated the method that the afterheat-state slag recycles, and its preferred forms is following:
1). the thickness of slag layer of record refining process molten steel jar, to preparing to carry out the jar that slag recycles, thickness of slag layer≤100mm;
2). during continuous casting is produced the molten steel in the molten steel jar is injected tundish; In molten steel jar molten steel weight is 5 ton hours; Middle Baogang water is carried out thermometric; When superheating temperature >=20 ℃ (superheating temperature is meant that liquid steel temperature deducts the difference of this steel grade liquidus temperature), this jar is that 1 ton hour stops cast (the surplus steel amount of molten steel jar is 0.5 ton when stopping to pour into a mould in the past) in the molten steel amount;
3). with crane the notes afterheat-state slag in the molten steel jar is poured into samely water time, in the molten steel jar of same steel grade refining (RH or LF) after finishing.Recycle design: first jar be back in the 3rd jar, second jar be back in the 4th jar, the N jar is back in the N+2 jar;
4). use and annotate afterheat-state slag circulation time,, inject smoothly in the molten steel jar after refining (RH or LF) finishes to guarantee the surplus slag of notes in the molten steel jar by the timed interval≤15min in molten steel jar cast end to the molten steel jar of pouring into after refining finishes;
5). the notes afterheat-state slag in the molten steel jar poured into samely water time, behind the molten steel jar of same steel grade refining (RH or LF) after finishing, to molten steel jar Argon 2min, argon flow amount is 20Nm 3/ h is with composition and the temperature in the even molten steel jar;
6). the molten steel jar after refining (RH or LF) finishes pour into annotate the afterheat-state slag before, ladle headroom >=400mm, otherwise do not recycle;
7). repeat next circulating process process, it is 3 times that notes afterheat-state slag recycles number of times, after 3 times, pours slag into slag ladle, transports slag treatment plant to and handles.
When adopt annotating the method that the afterheat-state slag recycles,,, prevent the jar of accepting slag produced and pollute then this jar steel hot steel slag must not recycle if just in case when a certain jar of steel tundish composition occurring and surpassing the ingredient standard of this steel grade.
For the jar that does not satisfy above-mentioned processing condition, handle the method that does not adopt slag to recycle by normal running.
Through after annotating the afterheat-state slag and recycling three times, the slag that will have 1 ton of molten steel is poured slag ladle into, transports slag treatment plant to and handles.Lost 1 ton of molten steel this moment, and the slag that at every turn will contain 0.5 ton of molten steel is poured slag ladle into, and three times will be lost the molten steel amount is 1.5 tons, and can save the molten steel amount like this is 0.5 ton, therefore, has improved the billet yield of molten steel.

Claims (2)

1. make steel the method that the afterheat-state slag recycles of annotating for one kind; It is characterized in that: molten steel is behind converter tapping; Finished to the tundish continuous casting by refining, molten steel jar molten steel recycles annotating surplus slag after continuous casting injects tundish; Same after pouring refining furnace into and finishing watered time, in the molten steel jar of same steel grade, will be introduced into the molten steel jar of annotating surplus slag again and winch to the continuous casting station with crane and pour into a mould.
2. a kind of steel-making according to claim 1 annotated the method that the afterheat-state slag recycles, and it is characterized in that:
1). the thickness of slag layer of record refining process molten steel jar, to preparing to carry out the jar that slag recycles, thickness of slag layer≤100mm;
2). during continuous casting is produced the molten steel in the molten steel jar being injected tundish, is 3~5 ton hours in molten steel jar molten steel weight, and middle Baogang water is carried out thermometric, and when superheating temperature >=20 ℃, this jar is that 0.8~1.0 ton hour stops to pour into a mould in the molten steel amount;
3). with crane the notes afterheat-state slag in the molten steel jar is poured into samely water time, in the molten steel jar of same steel grade refining after finishing, Recycle design: first jar be back in the 3rd jar, second jar be back in the 4th jar, the N jar is back in the N+2 jar;
4). use and annotate afterheat-state slag circulation time, by the timed interval≤15min in molten steel jar cast end to the molten steel jar of pouring into after refining finishes;
5). the notes afterheat-state slag in the molten steel jar poured into samely water time, behind the molten steel jar of same steel grade refining after finishing, to molten steel jar Argon 1~3min that molten steel is housed, argon flow amount is 10~30Nm 3/ h;
6). the molten steel jar after refining finishes pour into annotate the afterheat-state slag before, ladle headroom >=400mm, otherwise do not recycle;
7). repeat next circulating process process, annotate the afterheat-state slag and recycle number of times≤3 time, pour slag into slag ladle after surpassing 3 times, transport slag treatment plant to and handle.
CN201110077895.5A 2011-03-29 2011-03-29 Method for recycle of steel-making casting-remnant heat-state steel slag Active CN102719622B (en)

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

Applications Claiming Priority (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

Publications (2)

Publication Number Publication Date
CN102719622A true CN102719622A (en) 2012-10-10
CN102719622B CN102719622B (en) 2014-11-05

Family

ID=46945487

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110077895.5A Active CN102719622B (en) 2011-03-29 2011-03-29 Method for recycle of steel-making casting-remnant heat-state steel slag

Country Status (1)

Country Link
CN (1) CN102719622B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106811576A (en) * 2015-12-02 2017-06-09 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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108655383B (en) * 2017-03-29 2020-02-18 鞍钢股份有限公司 System and method for recovering waste heat of damaged hot metal ladle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1192817A (en) * 1997-09-19 1999-04-06 Sumitomo Electric Ind Ltd Recycling of slag in ladle-refining
CN1804047A (en) * 2006-01-19 2006-07-19 邯郸钢铁股份有限公司 Method for reclaiming and cyclic utilizing residue molten steel slag in steel making
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
JP2009221560A (en) * 2008-03-18 2009-10-01 Jfe Steel Corp Method for recycling slag in ladle
CN101886150A (en) * 2010-07-07 2010-11-17 江苏沙钢集团有限公司 Recycling method and system for steel ladle pouring afterheat-state steel slag

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1192817A (en) * 1997-09-19 1999-04-06 Sumitomo Electric Ind Ltd Recycling of slag in ladle-refining
CN1804047A (en) * 2006-01-19 2006-07-19 邯郸钢铁股份有限公司 Method for reclaiming and cyclic utilizing residue molten steel slag in steel making
JP2009221560A (en) * 2008-03-18 2009-10-01 Jfe Steel Corp Method for recycling slag in ladle
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
CN101886150A (en) * 2010-07-07 2010-11-17 江苏沙钢集团有限公司 Recycling method and system for steel ladle pouring afterheat-state steel slag

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
宋佳强: "钢渣梯级利用的应用基础研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》, 15 September 2007 (2007-09-15) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106811576A (en) * 2015-12-02 2017-06-09 鞍钢股份有限公司 A kind of hot circulation utilization method of vessel slag
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

Also Published As

Publication number Publication date
CN102719622B (en) 2014-11-05

Similar Documents

Publication Publication Date Title
CN100424189C (en) Method for reclaiming and cyclic utilizing residue molten steel slag in steel making
CN103334050B (en) Process utilizing sheet billet continuous casting to manufacture low aluminum silicon calm carbon structural steel
CN102399917A (en) Method for recycling residual hot steel slag in continuous casted steel ladle
CN104525880A (en) Manufacturing method for round billets with overlarge cross sections
CN103071771A (en) Stainless steel dedicated mold fluxes
CN101786145A (en) Method for casting, rolling and molding lead alloy plate strip
CN105537549A (en) Production method of continuous casting round billet of seamless steel tube steel at low temperature of minus 100 DEG C
CN100562591C (en) Technology with smelting ferroferrite with sponge iron
CN101007340B (en) Processing method of continuous casting tundish for reducing residual molten steel
CN102719622B (en) Method for recycle of steel-making casting-remnant heat-state steel slag
CN102943150A (en) Refined slag control method
CN102161080A (en) Manufacturing tool of high-compact wide and thick plate blank for wide and thick plate rolling mill and method
CN101508018A (en) Method for preventing heavy steel ingot from liquating by different pouring ladles
CN101596590B (en) Method for inhibiting large steel ingot from macrosegregation by mechanical stirring
CN102719588A (en) Slag washing desulphurization method for molten iron utilizing residue thermal-state steel slag
CN103305639B (en) A kind of thermal slag high efficiente callback utilizes technique
CN103014200B (en) Process applicable to transfer of molten steel slag of converter and optimization of treatment of hot smouldering slag
CN201082464Y (en) Molten metal continuously casting device
CN103938088A (en) A slab continuous casting method of an electric resistance alloy Cr20AlY
CN105945260A (en) Electroslag remelting method for producing large steel ingots by plurality of small furnaces
CN102806330B (en) Method for improving inner quality of continuous casting billet with thick and large section
CN110396637A (en) The technique of low cost, short route, high efficiency production SPHC
CN204209084U (en) A kind of continuous casting system producing the oval base of large gauge
CN101921890B (en) Method for recycling manganese element of pour exceed steel ingot
CN204430223U (en) The continuous casting production equipment of surface coverage elastomeric material steel and conticaster

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
C14 Grant of patent or utility model