CN100451131C - Production and utilization process for making steel using smelting slag - Google Patents
Production and utilization process for making steel using smelting slag Download PDFInfo
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- CN100451131C CN100451131C CNB2005101106517A CN200510110651A CN100451131C CN 100451131 C CN100451131 C CN 100451131C CN B2005101106517 A CNB2005101106517 A CN B2005101106517A CN 200510110651 A CN200510110651 A CN 200510110651A CN 100451131 C CN100451131 C CN 100451131C
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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 invention discloses a manufacturing utilizing technique of smelting returned steel, which comprises the following steps: recycling D-slag of rotary furnace, residual casting slag and decarbonized slag separately through slag disposal system; sorting; drying; blending D-slag of rotary furnace, residual casting slag and decarbonized slag according to proportion; putting in the weight waste steel groove into rotary furnace with waste steel as additive in the rotary furnace.
Description
Technical field
The present invention relates to a kind of metallurgical slag circulation development and use technology, especially a kind of smelting slag STEELMAKING PRODUCTION is utilized technology.
Background technology
At present, China's steel industry every year only converter smelting will produce all kinds of smelting slags of tens million of tons, the following general designation of this class slag metallurgical slag.For many years owing to numerous reasons, in view of the understanding of people to the metallurgical slag characteristic, always with it as solid waste (be commonly called as admittedly useless), make it can not get reasonable utilization, long-term occupied ground and contaminate environment, also contain the effective constituent that much can be used in the metallurgical slag simultaneously and thrown away in vain, so not only wasted resource, and increased the weight of the economical load of enterprise.Steel-making converter need to add various additives such as lime, ore, rhombspar etc. in smelting process, as the steel-making solvent, and the part metallurgical slag that produces in the converter steelmaking process mainly comprises in the bessemer furnace slag (this paper is called D-slag of rotary furnace), ladle behind the continuous casting in slag (this paper is called residual casting slag), the converter stove slag (this paper is called decarbonized slag) behind the dephosphorization, the character of the additive that the physics of this part metallurgical slag, chemical property and steel-making converter need to add in smelting process is close, and have reduce fusing point, in advance change slag, improve the characteristics of metal recovery rate.If this part metallurgical slag is dropped into converter steelmaking production cycle utilization, substitute the part smelt additive, not only can make this class metallurgical solid waste become the secondary resource of steel-making, can also realize metallurgical slag recycle to greatest extent, for the short flow process of metallurgical slag is used the new approach of opening up, have bigger economy and social value, for promoting steel mill's recycling economy, of far-reaching significance.Can also reduce steel-making cost.At present, also there are not proven technique and technology that metallurgical slag is carried out recycle in steelmaking process.
Summary of the invention
The purpose of this invention is to provide a kind of smelting slag STEELMAKING PRODUCTION and utilize technology, this technology can not only be improved the smelting iron and steel effect, can also substitute part and smelt auxiliary material, has both realized useless admittedly recycle, has saved resource again.
The invention provides a kind of smelting slag STEELMAKING PRODUCTION and utilize technology, this technology comprises the steps:
(c) the slag treatment system reclaims sorting, air seasoning with D-slag of rotary furnace, residual casting slag and the decarbonized slag classification of converter generation;
(d) dried D-slag of rotary furnace, residual casting slag and decarbonized slag are mixed, drop in the steel scrap hopper, enter converter steelmaking with steel scrap.
Above-mentioned smelting slag STEELMAKING PRODUCTION is utilized technology, and the particle diameter of D-slag of rotary furnace, residual casting slag and the decarbonized slag that sub-elects with size separation equipment is 10～100mm, is because the advantage that the metallurgical slag of this size range has low dust, feeds intake conveniently, dissolving is fast.Used size separation equipment is the vibratory screening apparatus of double-deck screen cloth.
Above-mentioned smelting slag STEELMAKING PRODUCTION is utilized technology, and the D-slag of rotary furnace that sub-elects, residual casting slag and decarbonized slag must leave indoor charge make-up area in, air seasoning, and the water content of the D-slag of rotary furnace after the air seasoning, residual casting slag and decarbonized slag is 0～2%.If the water content of D-slag of rotary furnace, residual casting slag and decarbonized slag is too high, humidity is excessive, the phenomenon of spray slag takes place in smelting process easily, even blast.
Above-mentioned smelting slag STEELMAKING PRODUCTION is utilized technology, must be when D-slag of rotary furnace, residual casting slag and decarbonized slag mix according to certain mixed, weight ratio when three kinds of metallurgical slags mix is 6: 3: 1, it also can be 7: 3: 0, adopt three kinds of metallurgical slags to mix, help avoiding or offsetting the influence of metallurgical slag composition fluctuation, all kinds of resources can be accessed fully rationally utilize, be convenient to bring into play the advantage of scale of metallurgical slag resource utilizing.。
Above-mentioned smelting slag STEELMAKING PRODUCTION is utilized technology, per 1.5～2.5 tons of D-slag of rotary furnace that mix, residual casting slag and decarbonized slags can replace 0.75-1.25 ton lime additive, be preferably, per 2 tons of D-slag of rotary furnace that mix, residual casting slag and decarbonized slags can replace 1 ton lime additive.
Above-mentioned smelting slag STEELMAKING PRODUCTION is utilized technology, can use the P content of the molten steel of producing, basic identical when containing the S amount and adding lime as additive in all steel grades are smelted.
Useful consequence of the present invention:
1, make such converter metallurgical solid waste become the secondary resource of steel-making, realized the short flow process recycle of metallurgical slag, and reduced such metallurgical slag that economic benefit and obvious social benefit are in particular in the pollution that environment caused:
(a) direct economic benefit of obtaining
Press the existing size of capacity of Baosteel and calculate, STEELMAKING PRODUCTION was by 350 days/year, and tapping is average pressed for 155 stove/days, and actual feeding intake calculated by 150 stoves/day, and charging capacity is calculated by (2～3) ton/furnace gauge, and the metallurgical quantity of slag of annual consumption is:
Consume the metallurgical quantity of slag=(2～3) ton/stove * year by 150 stoves/350 days/year=(105～15.75) ten thousand tons/year of day *
Smelting the lime unit price is: 405 yuan/ton, ton steel lime unit consumption is through conversion, and metallurgical slag replace lime usage ratio is 1: 0.5, calculating year saves the lime cost to be:
Year is saved ten thousand yuan/year of ten thousand tons of * 0.5*405 unit/ton=(2126～3189), lime cost=(10.5～15.75)
Metallurgical average 20 to 40 yuan of the comprehensive costs such as slag processing, storage, transportation that mix this shows, implement this technology and can year save ten thousand yuan of economic benefit 2000-3000, and as making an issue of in the production that becomes more meticulous, benefit will be more remarkable.
Simultaneously, smelting slag steel-making is because Tfe decline, can improve the recycling of iron, by test, original converter steelmaking Tfe average out to 18.5%, after the smelting slag steel-making, Tfe on average drops to 15.3%, has descended 3.2%, and every slag amount calculates according to 10% of molten steel, reclaimed in the molten steel about iron 950KG, be equivalent to add the 2t iron ore.
Year save amount of iron ores=2 ton/stove * by 350 days/year=10.5 ten thousand tons/year in 150 stoves/day *.
Iron ore price is at present according to 600 yuan of/ton calculating,
Year save 600 yuan/ton=6,300 ten thousand yuan of iron ore cost=10.5 ten thousand/ton *.
(b) social benefit
The smelting slag STEELMAKING PRODUCTION is utilized, this technology is in the all-round popularization of Baogang Stocks Trading Co.'s Baosteel Branch's, not only improved the utilization ratio of iron ore, saved resource, and make this class metallurgical solid waste become the secondary resource of steel-making, the annual short flow process recycle that can realize slag more than 100,000 tons is for new approach has been opened up in the application of metallurgical slag; Have objectionable constituent such as some sulphur, phosphorus in the metallurgical slag, be alkalescence after meeting water, these slags are equivalent to lime more than 40,000 tons as can not get timely utilization, will should not be underestimated to the pollution of soil and water resources.
In addition, China 2004 produces 2.7 hundred million tons of steel per year, and China Steel association prediction in this year is produced steel and will be reached 3.7 hundred million tons, and metallurgical slag will have 4,000 ten thousand tons of left and right sides metallurgical slags to produce as the secondary resource of smelting technology.The popularization of this technology still belongs to the firstly at home in the steel mill, for the short flow process utilization of other steel mill's metallurgical slag provides thinking, also promoted the raising of last Hypon smelting company metallurgical slag recycle level simultaneously, has great economic and social benefit.
2, smelting process blowingization slag situation obviously shifts to an earlier date and improves, and can improve the inner quality and the recovery rate of steel;
Find that with production test metallurgical slag has the reduction fusing point, changes the characteristic of slag in advance after deliberation, this technology has following effect and benefit concerning smelting iron and steel:
(a) obviously shift to an earlier date and improve in converter steelmaking process blowingization slag situation;
(b) from the converter basicity of packing into, can to a certain degree reduce a ton steel lime unit consumption;
(c) have the effect that marble, ore etc. are smelted auxiliary material, help metallic reducing and improve yield of alloy;
(d) can improve the inner quality of steel, the content of phosphorus, sulphur in the molten steel is not had influence, can realize each steel grade service requirements substantially.
Metallurgical slag adds converter, by following the tracks of smelting process and slag specimen analysis, in smelting process, because the change slag is in advance, for preventing to spray slag, impels operation rifle position to descend, and TFe descends (FeO in the slag descends) naturally in the slag, and TFe decline brings following benefit to smelting in the slag:
(a) reduce slag to lining erosion, help improving furnace life;
(b) contain [O in the molten steel
2] descend, improved the purity of steel;
(c) contain [O in the molten steel
2] descend, help the raising of yield of alloy.
3, can reduce steel-making cost, be in particular in: can to a certain degree reduce a ton steel lime unit consumption; Can substitute part marble, ore etc. and smelt auxiliary material;
4, adopt the mixing match method, help avoiding or offsetting the influence of slag composition fluctuation, all kinds of resources can be accessed fully rationally utilize, be convenient to bring into play the advantage of scale utilizing.
Embodiment
The specific embodiment of the present invention is as follows:
A kind of smelting slag STEELMAKING PRODUCTION is utilized technology, and this technology comprises following processing step:
(a) the slag treatment system reclaims D-slag of rotary furnace, residual casting slag and the decarbonized slag classification of converter generation, sub-elects the particle of diameter at 10～100mm, leaves the indoor stockyard of getting the raw materials ready in, air seasoning;
(b) dried D-slag of rotary furnace, residual casting slag and decarbonized slag are mixed in proportion, drop into during use between weighing in the steel scrap hopper, enter converter steelmaking with steel scrap, as the alternative additive in the converter smelting.
Embodiment 1:
Reclaim with D-slag of rotary furnace, residual casting slag and decarbonized slag classification that the slag treatment system produces converter, sub-elect the particle of diameter, leave the indoor stockyard of getting the raw materials ready at 10～20mm, air seasoning, the water content of dried D-slag of rotary furnace, residual casting slag and decarbonized slag is 1%; 's 6: 3: 1 mixed with dried D-slag of rotary furnace, residual casting slag and decarbonized slag according to weight ratio, drop into during use between weighing in the steel scrap hopper, enter converter steelmaking with steel scrap, per 2 tons of D-slag of rotary furnace that mix, residual casting slag and decarbonized slag replace 1 ton lime additive.Implementation result: the P content of the molten steel of producing, identical when containing the S amount and adding lime as additive.
Embodiment 2:
Reclaim with D-slag of rotary furnace, residual casting slag and decarbonized slag classification that the slag treatment system produces converter, sub-elect the particle of diameter, leave the indoor stockyard of getting the raw materials ready at 40～50mm, air seasoning, the water content of dried D-slag of rotary furnace, residual casting slag and decarbonized slag is 1.5%; Must be 6: 3: 1 mixed according to weight ratio with dried D-slag of rotary furnace, residual casting slag and decarbonized slag, drop between weighing in the steel scrap hopper, enter converter steelmaking with steel scrap, per 2 tons of D-slag of rotary furnace that mix, residual casting slag and decarbonized slag replace 1 ton lime additive.Implementation result: the P content of the molten steel of producing, identical when containing the S amount and adding lime as additive.
Embodiment 3:
Reclaim with D-slag of rotary furnace, residual casting slag and decarbonized slag classification that the slag treatment system produces converter, sub-elect the particle of diameter, leave the indoor stockyard of getting the raw materials ready at 60～70mm, air seasoning, the water content of dried D-slag of rotary furnace, residual casting slag and decarbonized slag is 2%; With dried D-slag of rotary furnace and residual casting slag, must be 7: 3 mixed according to weight ratio, drop into during use between weighing in the steel scrap hopper, enter converter steelmaking with steel scrap, per 2 tons of D-slag of rotary furnace that mix and residual casting slag replace 1 ton lime additive.Implementation result: the P content of the molten steel of producing, identical when containing the S amount and adding lime as additive.
Embodiment 4:
Reclaim with D-slag of rotary furnace, residual casting slag and decarbonized slag classification that the slag treatment system produces converter, sub-elect the particle of diameter, leave the indoor stockyard of getting the raw materials ready at 90～100mm, air seasoning, the water content of dried D-slag of rotary furnace, residual casting slag and decarbonized slag is 2%; With dried D-slag of rotary furnace and residual casting slag.Must be that 7: 3 mixed drops into when using between weighing in the steel scrap hopper according to weight ratio, enter converter steelmaking with steel scrap, per 2 tons of D-slag of rotary furnace that mix and residual casting slag replace 1 ton lime additive.Implementation result: the P content of the molten steel of producing, identical when containing the S amount and adding lime as additive.
Can also obtain following conclusion by embodiment 1～4: smelting slag steel-making utilization helps improvementizations slag, and the change slag obviously shifts to an earlier date, and the content of phosphorus, sulphur in the molten steel is not had influence substantially; And can reduce the lime unit consumption to a certain extent.Finding that it has can substitute metallurgic auxiliary materials such as flux, ore, and steel-making is accelerated to smelt rhythm positive effect, and experiment not only reaches alternative flux, part ore, reduces the re-set target of lime usage quantity.Afterwards, analyzed, found also that it had the steel quality of improvement, improved the smelting effect of characteristics such as metallic reducing according to test heat slag specimen.
Claims (5)
1. a smelting slag STEELMAKING PRODUCTION is utilized technology, it is characterized in that this technology comprises following processing step:
(a) the slag treatment system reclaims sorting, air seasoning with D-slag of rotary furnace, residual casting slag and the decarbonized slag classification of converter generation;
(b) dried D-slag of rotary furnace, residual casting slag and decarbonized slag are mixed, drop into the steel scrap hopper.
2. smelting slag STEELMAKING PRODUCTION according to claim 1 is utilized technology, and the water content after D-slag of rotary furnace, residual casting slag and the decarbonized slag air seasoning that it is characterized in that sub-electing is 0～2%.
3 smelting slag STEELMAKING PRODUCTION according to claim 1 are utilized technology, it is characterized in that the weight ratio when D-slag of rotary furnace, residual casting slag and decarbonized slag mix is 6: 3: 1.
4. smelting slag STEELMAKING PRODUCTION according to claim 1 is utilized technology, it is characterized in that D-slag of rotary furnace, the weight ratio when residual casting slag mixes are 7: 3.
5. utilize technology according to claim 3 or 4 described smelting slag STEELMAKING PRODUCTION, it is characterized in that per 1.5～2.5 tons of D-slag of rotary furnace that mix, residual casting slag and decarbonized slags can replace the lime additive of 0.75-1.25 ton.
6. smelting slag STEELMAKING PRODUCTION according to claim 5 is utilized technology, it is characterized in that per 2 tons of D-slag of rotary furnace that mix, residual casting slag and decarbonized slags can replace 1 ton lime additive.
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| CNB2005101106517A CN100451131C (en) | 2005-11-23 | 2005-11-23 | Production and utilization process for making steel using smelting slag |
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| CNB2005101106517A CN100451131C (en) | 2005-11-23 | 2005-11-23 | Production and utilization process for making steel using smelting slag |
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| CN100451131C true CN100451131C (en) | 2009-01-14 |
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| BR112015008720B1 (en) * | 2012-10-30 | 2020-02-11 | Jfe Steel Corporation | METHOD FOR REFINING HOT METAL |
| CN105969931A (en) * | 2016-06-27 | 2016-09-28 | 江苏永钢集团有限公司 | Recycling method for large ladle of residues |
| CN108796164B (en) * | 2018-07-02 | 2020-08-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting method of No. 45 steel |
| CN108774660B (en) * | 2018-07-02 | 2020-08-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting method of DTLA steel |
| CN111349746A (en) * | 2018-12-24 | 2020-06-30 | 新疆八一钢铁股份有限公司 | Process for replacing converter lime by using steelmaking tailings |
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