CN100424189C - Method for reclaiming and cyclic utilizing residue molten steel slag in steel making - Google Patents
Method for reclaiming and cyclic utilizing residue molten steel slag in steel making Download PDFInfo
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- CN100424189C CN100424189C CNB2006100123454A CN200610012345A CN100424189C CN 100424189 C CN100424189 C CN 100424189C CN B2006100123454 A CNB2006100123454 A CN B2006100123454A CN 200610012345 A CN200610012345 A CN 200610012345A CN 100424189 C CN100424189 C CN 100424189C
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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
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Abstract
The present invention relates to a method for reclaiming and cyclic utilizing residue molten steel slag in steel making, which belongs to the technical field of a production technology in steel making. The present invention is used for solving the problems of lowering the consumption of slag forming materials and power consumption in the process of smelting, reusing resources and reducing the environmental pollution of slag. The present invention has the technical scheme that the method has the steps: a. filling residue molten steel slag in a ladle into an empty ladle after pouring; b. tapping: conveying the ladle filled with the residue molten steel slag to a converter for tapping inward; c. refining the residue molten steel slag; d. pouring the residue molten steel slag again. The residue molten steel slag can be filled into an empty ladle again for a next periodic use. The present invention can fully use the sulfur capacity and the strong reducing properties of the molten steel slag, quickly regulate the components of a slag system so as to form a slag system with low melting point, improve slag fluidity, effectively absorb impurities in the molten steel, enhance the cleanliness of the molten steel, shorten the sludging time of slag with high alkalinity, enhance the basicity of slag of the ladle, benefit desulfuring, enhance the refining efficiency, lower the power consumption and the cold slag material consumption, and reduce the production cost.
Description
Technical field
The present invention relates to a kind of method of making steel the recycle and reuse of pouring afterheat-state slag, belong to the steel-smelting production process technical field.
Background technology
The main task of STEELMAKING PRODUCTION be with element such as the C in the molten iron, Mn, Si, S, P and inclusion removal to certain content range, then, according to the difference of smelting steel grade, with the adding of respective alloy element wherein, satisfy the requirement of steel grade again to chemical ingredients.Because it is different to remove the required conditions such as thermodynamics of above-mentioned each element, therefore, the production technique of the refining just of the general employing of steelmaking process at present, refining, continuous casting steel machine.Promptly, by to first furnace oxygen supply, with the C in the molten steel, Mn, Si, etc. element be oxidized in certain content range, simultaneously, also residual a part of oxygen in the molten steel subsequently, is poured out and is transported to the refining position with the molten steel after the refining just and carry out production operations such as desulfuration, deoxidation, eliminating inclusion, simultaneously, adjust other constituent content within the steel grade claimed range; Refining desulfuration, deoxidation are to make the reducing slag of high basicity, low FeO, good fluidity and realize by add slag charges such as lime in refining furnace; Refining transports the qualified molten steel that is coated with the some amount slag to continuous caster and pours into a mould after finishing.When the molten steel in the ladle is about to emptying, close the steel ladle pouring mouth of a river, enter into the continuous casting tundish to reduce slag.At this moment, remaining hot steel slag in the ladle is poured in the slag pan, empty ladle carries out STEELMAKING PRODUCTION working cycle next time.Aforesaid method exists following shortcoming: 1. the hot steel slag that still has certain sulfur capacity and reductibility is discarded, and can not give full play to its sweetening power and deoxidizing capacity; 2. discarded in a large number slag contaminate environment; 3. heat can not be fully utilized, and next circulation adopts cold slag charge slag making slagging speed slow, is unfavorable for saving energy and reduce the cost.
Summary of the invention
The objective of the invention is to overcome the problem that above-mentioned prior art exists and a kind of method of making steel the recycle and reuse of the empty bag of pouring afterheat-state slag is provided, reduce the consumption and the power consumption of slag making material in the smelting process, realize the utilization again of resource, reduce the pollution of slag simultaneously environment.
Technical problem to be solved by this invention adopts following proposal to realize:
A kind of method of making steel the recycle and reuse of pouring afterheat-state slag, it is undertaken by following operation successively:
A. cast finishes, and the pouring afterheat-state slag in the ladle is poured in the sky ladle;
B. tapping: this ladle that fills the pouring afterheat-state slag is transported to converter place, in it, taps;
C. refining: the ladle that will fill molten steel and pouring afterheat-state slag is transported to the refining station, carries out refining;
D. cast: the ladle after the refining is transported to pouring aisle, pours into a mould.
Can again the pouring afterheat-state slag be poured in the sky ladle, recycle in order to the next one.
The method of above-mentioned steel-making pouring afterheat-state slag recycle and reuse, described same stove pouring afterheat-state slag recycles 1～4 cycle, discards then.
The method of above-mentioned steel-making pouring afterheat-state slag recycle and reuse is describedly poured the pouring afterheat-state slag in the sky ladle into to the timed interval≤10 between the steel melting furnace tapping minute.
The method of above-mentioned steel-making pouring afterheat-state slag recycle and reuse is in described tapping operation, to the continuous Argon of ladle, to guarantee fully to carry out the matter and energy exchange between slag.
The method of above-mentioned steel-making pouring afterheat-state slag recycle and reuse, in described tapping operation at the end, the ladle headroom is not less than 350mm.
The method of above-mentioned steel-making pouring afterheat-state slag recycle and reuse, after the tapping to the refining, can be to ladle argon-blown.
The inventive method will be made steel the recycling use in addition of pouring afterheat-state slag, have following advantage:
(1). can make full use of the sulfur capacity and the strong reducing property of hot steel slag.When steel melting furnace when ladle is toppled over molten steel, can reach thorough mixing between slag by the powerful surging force of molten steel to bag bottom pour mold afterheat-state slag, increase between slag and contact area, realize abundant deoxidation, desulfurization, reduce slag oxidation, increase substantially yield of alloy.
(2). owing to carried out sufficient energy exchange and deoxygenation etc., can adjust slag system rapidly and form between slag, form the low melting point slag system, improve slag fluidity, effectively absorb inclusion in the molten steel, improve the degree of cleaning of molten steel;
(3). before the refining, hot steel slag has had certain basicity, thereby has shortened the sludging time of high basicity slag, improves ladle slag basicity, helps removing harmful element sulphur in the molten steel.
(3). after slag carried out upgrading, make the composition of slag and performance, improve refining efficiency near the requirement of submerged arc base slag;
(4). reduce the cold burden add-on, reduce power consumption and cold slag charge consumption, slagging shortens refining time fast, has satisfied the needs that fast pace is produced, and reduces production costs;
(5). the utilization again that has realized resource has reduced and has discarded the slag pollution on the environment.
Description of drawings
Fig. 1 is a process flow sheet of the present invention.
Mark is as follows among the figure: 1. converter 2. buggy ladles 3,8,9. ladle 4. refining steels 5. refining ladle, 6. refining furnaces, 7. continuous casting turn around table .10. ladle straddle carriers, 11. slag pans of hiring a car
Embodiment
Present embodiment is the empty bag of continuous casting and rolling (CSP) pouring afterheat-state slag recovery of heat cyclic utilization method.Referring to Fig. 1, its technology is undertaken by following operation successively:
A. pour the pouring afterheat-state slag into the sky ladle: after the CSP cast finishes, the ladle 8 usefulness overhead traveling cranes that fill the pouring afterheat-state slag are winched to ladle straddle carrier 10, again straddle carrier 10 is opened to ladle and prepared to stride, with overhead traveling crane ladle 8 is winched to empty ladle 3 places that are about to tapping then, CSP pouring afterheat-state slag in the ladle 8 is poured in the sky ladle 3; The empty ladle 3 that has filled hot steel slag should be realized converter tapping in 10 minutes.
B. tapping: the buggy ladle that will be loaded with pouring afterheat-state slag ladle 3 leaves to converter 1 place, to the ladle tapping that is loaded with the pouring afterheat-state slag; At the tapping initial stage, BOTTOM ARGON BLOWING tolerance is bigger, reduces BOTTOM ARGON BLOWING tolerance subsequently.In the tapping process, guarantee ladle 3 omnidistance Argons.The ladle headroom is of a size of after having gone out steel: medium carbon steel is not less than 350mm, soft steel 400mm.
Empty bag recovery of heat heat, converter does not add synthetic slag in tapping process.
Medium carbon steel tapping: add lime 200Kg, aluminium block 120Kg; Soft steel tapping: add lime 400Kg, aluminium block 200Kg.
After ladle 3 has gone out steel, if can not in time advance refining, blowing argon gas discontinuously behind stove.
C. refining: will go out the buggy ladle 2 of steel, and open to ladle and prepare to stride, the ladle 3 usefulness overhead traveling cranes that fill molten steel and pouring afterheat-state slag are winched to refining steel hired car 4, and refining steel hired car 4 opened to LF refining furnace 6 places carried out refining; Before refining finished departures, it was thick to survey slag, and with the thick circular of ladle slag operation department.
During the smelting low carbon steel, refining ladle 5 departures forbid adding carbonization rice husk, in order to avoid carburetting in the removal process.
D. cast: the ladle after the refining 3 is winched to CSP continuous casting turn around table 7 places pour into a mould, finish pouring afterheat-state slags in the ladle 3 of cast enter the next one and recycle.
Second recycling round-robin operation is identical with above-mentioned operation.Same furnace refining slag, circulation is reclaimed three times.Refining slag with recovery of heat 3 times winches to slag pan 10 places, pours in the slag pan 11, is transported to spoil area.
If ladle 8 is 2 times or 3 recovery of heat, then should to feed back slag according to refining thick in the operation department, effectively controls yield.If ladle 8 slags are thick in 300mm, then ladle 8 usefulness overhead traveling cranes are winched to slag pan 11 places, outwell a part of warm sludge, hang ladle 3 places again, reclaim.
Claims (7)
1. make steel the method for pouring afterheat-state slag recycle and reuse for one kind, it is characterized in that: it is undertaken by following operation successively:
A. cast finishes, and the pouring afterheat-state slag in the ladle is poured in the sky ladle;
B. tapping: this ladle that fills the pouring afterheat-state slag is transported to converter place, in it, taps;
C. refining: the ladle that will fill molten steel and pouring afterheat-state slag is transported to the refining station, carries out refining;
D. cast: the ladle after the refining is transported to pouring aisle, pours into a mould.
2. the method for steel-making pouring afterheat-state slag according to claim 1 recycle and reuse is characterized in that: same stove pouring afterheat-state slag recycles 1～4 cycle, discards then.
3. according to the method for claim 1 or 2 described steel-making pouring afterheat-state slag recycle and reuse, it is characterized in that: the pouring afterheat-state slag is poured in the sky ladle to the timed interval≤10 between the steel melting furnace tapping minute.
4. according to the method for claim 1 or 2 described steel-making pouring afterheat-state slag recycle and reuse, it is characterized in that: in described tapping operation, to the continuous Argon of ladle.
5. according to the method for the described steel-making pouring afterheat-state slag recycle and reuse of claim 3, it is characterized in that: in described tapping operation, to the continuous Argon of ladle.
6. according to the method for claim 1 or 2 described steel-making pouring afterheat-state slag recycle and reuse, it is characterized in that: in described tapping operation at the end, ladle headroom size is not less than 350mm.
7. according to the method for the described steel-making pouring afterheat-state slag recycle and reuse of claim 5, it is characterized in that: back to refining, to ladle argon-blown in described tapping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100123454A CN100424189C (en) | 2006-01-19 | 2006-01-19 | Method for reclaiming and cyclic utilizing residue molten steel slag in steel making |
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| CNB2006100123454A CN100424189C (en) | 2006-01-19 | 2006-01-19 | Method for reclaiming and cyclic utilizing residue molten steel slag in steel making |
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| CN1804047A CN1804047A (en) | 2006-07-19 |
| CN100424189C true CN100424189C (en) | 2008-10-08 |
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Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597656B (en) * | 2009-07-28 | 2010-09-22 | 首钢总公司 | High temperature furnace slag sensible heat power generating method |
| CN101717843B (en) * | 2009-12-24 | 2011-06-29 | 东北大学 | Method for utilizing sulfur-containing refining waste residue for refining slag |
| CN102296144A (en) * | 2010-06-25 | 2011-12-28 | 鞍钢股份有限公司 | Molten steel slag removing method |
| CN102337379A (en) * | 2010-07-22 | 2012-02-01 | 攀钢集团钢铁钒钛股份有限公司 | Method for recycling ladle slag |
| CN101921890B (en) * | 2010-08-18 | 2012-03-21 | 山西太钢不锈钢股份有限公司 | Method for recycling manganese element of pour exceed steel ingot |
| CN102011057B (en) * | 2010-12-27 | 2013-07-24 | 承德建龙特殊钢有限公司 | CrMnTi series gear steel and processing technique thereof |
| CN102719588A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Method for carrying out slag washing desulfurization on molten iron by using residual heat injection steel slag |
| CN102719622B (en) * | 2011-03-29 | 2014-11-05 | 鞍钢股份有限公司 | Method for recycling steel-making injection residual thermal-state steel slag |
| CN102962421A (en) * | 2012-11-26 | 2013-03-13 | 湖南华菱湘潭钢铁有限公司 | Hot recycling method of continuous-casting tundish |
| CN105132626A (en) * | 2015-08-14 | 2015-12-09 | 攀钢集团攀枝花钢钒有限公司 | Casting residual steel slag recycling method |
| CN105087853B (en) * | 2015-09-21 | 2017-12-15 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of converter semi-steel making slag making |
| CN107245636B (en) * | 2017-06-23 | 2019-03-29 | 江苏省沙钢钢铁研究院有限公司 | Smelting and pouring method for alloy with different chemical components in same heat |
| 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 |
| CN109797338A (en) * | 2019-02-11 | 2019-05-24 | 黑龙江建龙钢铁有限公司 | A kind of big packet of square billet process pours remaining back to half ladle semisteel smelting technique |
| CN114247876A (en) * | 2021-12-14 | 2022-03-29 | 吉林金钢钢铁股份有限公司 | Ladle stuffing sand adding device and method |
| CN114540567B (en) * | 2022-03-09 | 2023-05-26 | 天津市新天钢联合特钢有限公司 | Technological method for recycling residual steel slag of continuous casting ladle in converter tapping |
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