CN104789718B - A kind of recoverying and utilizing method of steel slag - Google Patents

A kind of recoverying and utilizing method of steel slag Download PDF

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Publication number
CN104789718B
CN104789718B CN201510109842.5A CN201510109842A CN104789718B CN 104789718 B CN104789718 B CN 104789718B CN 201510109842 A CN201510109842 A CN 201510109842A CN 104789718 B CN104789718 B CN 104789718B
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particle diameter
magnetic separation
steel
slag
slags
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CN104789718A (en
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陈伟
胡治春
吴守仓
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MCC Baosteel Technology Services Co Ltd
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MCC Baosteel Technology Services Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B3/00General features in the manufacture of pig-iron
    • C21B3/04Recovery of by-products, e.g. slag
    • 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 present invention relates to a kind of recoverying and utilizing method of steel slag, through multiple magnetic separation after more than 100 DEG C steel slags and 30 DEG C of 40 DEG C of steel slags mixing pretreatments, repeatedly screening, repeatedly the method such as broken reclaims the substitute for obtaining low iron metallurgical production auxiliary material, magnetic separation material is through magnetic separation in steel slag, grinding, the method such as screening and dry method wind-force magnetic separation reclaims the substitute for obtaining high ferro metallurgical production auxiliary material, realize that steel plant reduce smelting cost, reduce the exploitation and calcining of natural crystal, reduce greenhouse gas emission, there is fine environmental benefit, steel slag short route and high recycling purpose are reached simultaneously.

Description

A kind of recoverying and utilizing method of steel slag
Technical field
The present invention relates to a kind of recycling method of waste of metallurgy industry, and in particular to a kind of recovery profit of steel slag Use method.
Background technology
The steel slag that metallurgical steel mill discharges every year is about nearly 100,000,000 tons, and steel slag is liquid molten shape when discharging, and is not only contained There is substantial amounts of heat, and with about 10% or so the residual steel of impurity (so-called " impurity "-cinder ladle iron, iron cinder inclusion shape State), and many useful compositions such as substantial amounts of oxide complex and beneficial element.And many slags are not because obtaining effectively Processing and utilization was, it is necessary to which a large amount of stackings, had both directly occupied a large amount of farmland soils, and while its dust largely washes away with rainwater, made oxygen Change calcium and be dissolved in water, alkalization of soils nearby, Its Adjacent Waters or the rise of river pH value, severe contamination surrounding enviroment, structure are caused again Into the difficult point of iron and steel enterprise's environmental management.Therefore, from recycle and its development angle of recycling economy in terms of, slag have money The high value of source regeneration utilizes potential, is precious all over the body, is the secondary resource of great value of exploiting and utilizing.
With the high development of modernization industry, the requirement to steel product quality is more and more high, such as deep punching steel, pipe line steel, no Become rusty steel and ultralow phosphorus, ultralow-sulfur steel etc..The quality of steel products is mainly reflected in two aspects of surface quality and inherent quality, one It is that harmful element (S, P, H, O, N, or even C) content is low;Two be that non-metallic inclusion (especially brittle inclusion) content is low. In metallurgical production, clean steel is greatly developed, must be by adding corresponding various metallurgic auxiliary materials, by the impurity element in molten steel (S, P, H, O, N, C) and non-metallic inclusion are denatured or removed.The cost of steel mill's metallurgic auxiliary materials accounts for steel mill's machine Material Cost 30%, depressed in current metallurgy industry, under the dispirited not good overall situation of steel market, cost efficiency is that steel plant pull through their difficulties Important means.Steel product quality and the duration of heat are not being influenceed, is seeking the part substitute products of metallurgic auxiliary materials, reduces to greatest extent The purchase cost of metallurgic auxiliary materials is the optimal selection of steel plant's cost efficiency and most effective approach.
Because steel slag is the product of smelting iron and steel, according to " similar compatibility " principle, partial metallurgical is substituted using steel slag Auxiliary material be used for smelting process will not have a negative impact to steel product quality, due to steel slag category " pre- melt ", its it is useful into Divide similar with metallurgic auxiliary materials main component, partial metallurgical auxiliary material is substituted using steel slag, both solved the accumulation pair of steel slag solid waste The adverse effect of environment, the short route that solid waste resource is realized again is recycled, and is also made that for steel plant's cost efficiency very big Contribution.
Therefore, by the use of steel slag " pre- melt " as base-material, developing a kind of steel slag is used for steel slag for metallurgical production The recoverying and utilizing method of auxiliary material is the process difficulties that Sci-tech Staff In Metallurgical Industry is eager to solve.
The content of the invention
It is an object of the invention to the defect for overcoming prior art, there is provided a kind of recoverying and utilizing method of steel slag, 100 DEG C After above steel slag and the mixing pretreatment of 30 DEG C of -40 DEG C of steel slags through multiple magnetic separation, repeatedly screening, repeatedly the method such as broken reclaim Obtain magnetic separation material in the substitute of low iron metallurgical production auxiliary material, steel slag square through magnetic separation, grinding, screening and dry method wind-force magnetic separation etc. Method reclaims the substitute for obtaining high ferro metallurgical production auxiliary material, realizes that steel plant reduce smelting cost, reduces the exploitation of natural crystal And calcining, greenhouse gas emission is reduced, there is fine environmental benefit, while reaching steel slag short route and high recycling purpose.
The present invention is achieved by the following technical solutions:
A kind of recoverying and utilizing method of steel slag, comprises the following steps:
Screening for the first time, which is carried out, after more than (1) 100 DEG C steel slag and 30 DEG C of -40 DEG C of steel slags mixing pretreatments obtains particle diameter >=250mm steel scraps and particle diameter < 250mm steel slags;
(2) the particle diameter < 250mm steel slags carry out first time magnetic separation and obtain particle diameter < 250mm magnetic separation material and particle diameter < 250mm first time magnetic separation steel slags;
(3) the first time magnetic separation steel slag carries out second of screening and obtains particle diameter<80mm steel slags and 80mm≤particle diameter < 250mm steel slags;
(4) particle diameter<80mm steel slags carry out second of magnetic separation and obtain particle diameter < 80mm magnetic separation material and particle diameter < 80mm Second of magnetic separation steel slag;
(5) second of magnetic separation steel slag carries out third time screening and obtains particle diameter<20mm steel slags and 20mm≤particle diameter < 80mm steel slags, the 20mm≤particle diameter < 80mm steel slags are used as slag former;
(6) particle diameter<20mm steel slags carry out third time magnetic separation and obtain particle diameter < 20mm magnetic separation material and particle diameter < 20mm Third time magnetic separation steel slag;
(7) the third time magnetic separation steel slag carries out the 4th screening and obtains particle diameter<2mm steel slags and 2mm≤particle diameter < 20mm steel slags, the particle diameter<2mm steel slags are used as desulfurizing agent or sintering circuit flux.
The steel slag can be vessel slag or refining slag.
It is preferred that, the mass ratio of more than the 100 DEG C steel slags and described 30 DEG C of -40 DEG C of steel slags is 1:2-3, pretreatment Time 8-12 hour.Will be more than more than 100 DEG C steel slags and cold conditions normal temperature steel slag (30 DEG C of -40 DEG C of steels in fixed slag chute Slag) mix is carried out, using more than 100 DEG C steel slag heats by mixing slag while moisture evaporation, steel slag and slag steel Mixture is heated stress, because modulus of elasticity is different, can produce and be cracked after different degrees of deformation, slag steel surface scum silica frost It can peel off, block steel slag diminishes due to hydration reaction expansion meeting efflorescence, particle diameter, meets belt feeder sorting and magnetic separation It is required that.
It is preferred that, moisture content is after more than the 100 DEG C steel slags and 30 DEG C of -40 DEG C of steel slags mixing pretreatment Below 5wt%, calcium oxide content 40wt%-62wt%, all iron content >=20wt%.
It is preferred that, 80mm described in step (3)≤particle diameter < 250mm steel slags after crushing return to step (3) or to walk Suddenly (4) carry out second of magnetic separation.
It is preferred that, return to step (6) is re-used 2mm described in step (7)≤particle diameter < 20mm steel slags after crushing.
Calcium oxide content >=42wt% of above-mentioned 20mm≤particle diameter < 80mm steel slags, average activity degree 260~300 contains Water rate≤2wt%, the particle diameter<Calcium oxide content >=42wt% of 2mm steel slags, average activity degree 320~350, moisture content ≤ 1wt%, 18wt%≤all iron content≤60wt%, such as 20wt%≤all iron content≤60wt%.
Above-mentioned particle diameter >=250mm steel scraps obtain high-purity slag steel by gas flame cuttiug.
It is preferred that, the recoverying and utilizing method of above-mentioned steel slag also comprises the following steps:
(8) by above-mentioned particle diameter < 250mm magnetic separation material, above-mentioned particle diameter < 80mm magnetic separation material and above-mentioned particle diameter < 20mm magnetic separation material Magnetic separation removal tailings is carried out after mixing to obtain mixing magnetic separation material;
(9) the mixing magnetic separation material sieve obtaining particle diameter >=20mm magnetic separation material and particle diameter < 20mm magnetic separation material;
(10) particle diameter >=20mm magnetic separation material are ground obtains 20mm≤particle diameter with progress magnetic separation removal tailings after screening < 100mm magnetic separation material, the 20mm≤particle diameter < 100mm magnetic separation material is used as steel-making cooling agent;
(11) magnetic separation and screening are carried out after the drying of particle diameter < 20mm magnetic separation material and grinding, obtains 3mm≤particle diameter<20mm Magnetic separation material and particle diameter < 3mm magnetic separation material, the 3mm≤particle diameter<20mm magnetic separation material is used as steel-making oxidant or steel-making cooling agent.
It is preferred that, the particle diameter < 3mm magnetic separation material obtain bis- magnetic separation material of particle diameter < 3mm through dry method wind-force magnetic separation, described It is used as steel-making oxidant or cooling agent after bis- magnetic separation material pelletizings of particle diameter < 3mm.The magnetic separation of dry method wind-force can be sorted using magnetic roller cylinder Magnetic separation material, is equipped with compressed air as the interference medium for eliminating magnetic separation fine powder magnetic coagulation, it is preferred that the magnetic pole gradient point of magnetic roller cylinder Cloth is cylinder table magnetic induction intensity 1000-3500Gs, and compressed air is that oil-free is anhydrous, pressure 0.15-0.35MPa.
The recoverying and utilizing method of above-mentioned steel slag, all iron contents of the 20mm≤particle diameter < 100mm magnetic separation material >= 96wt%, sulfur content≤0.04wt%, the 3mm≤particle diameter<All iron content >=90wt% of 20mm magnetic separation material, sulfur content≤ 0.04wt%, all iron content >=80wt% of described bis- magnetic separation material of particle diameter < 3mm, sulfur content≤0.04wt%.
It is above-mentioned to be sieved through screening plant such as vibratory sieve.
Above-mentioned magnetic separation passes through for example single, double roller magnetic separator of concentration equipment, magnetic drum refiner, special dry method fine powder purifying machine.
Above-mentioned grinding passes through lapping device such as rod mill, ball mill.
Above-mentioned drying passes through drying unit such as rotary drum dryer.
By the recoverying and utilizing method of above-mentioned steel slag, tailings metal Ferrum content≤1wt% realizes iron in steel slag and provided The abundant recovery in source and high value added utilization, realize the short route of useful chemical composition CaO, MgO, MnO in steel slag tailings Return Commercial cultivation.The alternative metallurgic auxiliary materials of product obtained by the recoverying and utilizing method of above-mentioned steel slag, can reduce natural stone Ash consumption, the consumption of reduction steel scrap, reduction oxidant consumption etc., while reduction smelting cost, produce huge environmental benefit.
The technique effect and advantage of the present invention is:
(1) recoverying and utilizing method of steel slag of the invention reclaims the replacement for obtaining metallurgical production auxiliary material from steel slag Product, available for molten iron preprocessing station and converter smelting different times, substitute respectively slag former, desulfurizing agent, sintering circuit flux, The metallurgical production auxiliary material such as cooling agent or steel-making oxidant is made steel, realizes that steel plant reduce smelting cost, reduces opening for natural crystal Adopt and calcine, reduce greenhouse gas emission, there is fine environmental benefit, while reaching steel slag short route and high recycling mesh 's;
(2) recoverying and utilizing method of steel slag steel slag of the invention realize metal Ferrum content in steel slag tailings≤ 1wt%, finished product steel slag powder all iron content >=80wt% target, realize iron resource in steel slag solid waste depth purification and Develop there is provided a set of steel slag short route value added applications technology, be steel mill's cost efficiency and open up steel slag and follow Ring utilization ways are made that contribution.
Brief description of the drawings
The recoverying and utilizing method flow chart of steel slag in Fig. 1 embodiments 4
The recoverying and utilizing method flow chart of steel slag in Fig. 2 embodiments 6
Embodiment
Illustrate technical scheme below by way of specific instantiation.It should be understood that the present invention mention one or Multiple method and steps, which do not repel before and after the combination step, also has other method step or the step specifically mentioned at these Other method step can also be inserted between rapid;It should also be understood that these embodiments are merely to illustrate the present invention rather than limitation The scope of the present invention.Moreover, unless otherwise indicated, the numbering of various method steps is only the convenient tool for differentiating various method steps, Rather than ordering or restriction enforceable scope of the invention, the change of its relativeness or tune for limitation various method steps It is whole, in the case of without essence change technology contents, when being also considered as enforceable category of the invention.
Low iron metallurgic auxiliary materials
Slag former
Converter smelting slag making refers to, by controlling the type and quantity into clinker material, make clinker have some properties, with full In sufficient molten bath the technological operation needed is reacted about steel-making.Because the converter smelting time is short, it is necessary to rapid slagging, smelting could be met The requirement of refining process and strengthening smelting, while slag making has directly to avoiding splash, reducing metal loss and improving lining durability Influence.Conventional slag former is metallurgy lime at present, and composition CaO is more than 80wt%, and activity degree is more than 250.
20mm≤particle diameter < 80mm the steel slags obtained by the recoverying and utilizing method of the steel slag of the present invention can be used as slag making Agent, substitutes the technological principle of metallurgy lime slag former:For ease of desiliconization, desulfurization, dephosphorization in converter smelting, shorten smelting cycle, Conventional metallurgy lime quickly forms clinker, also furnace lining can be produced between protective effect, the general 2.5-3.2 of basicity of slag, warp Obtained 20mm≤particle diameter < 80mm the steel slags of recoverying and utilizing method of the steel slag of the present invention can be used as slag former chemistry into Divide and activity degree detection, its calcium oxide content >=42wt%, average activity degree 260~300, moisture content≤2wt%, using 2 tons 20mm≤particle diameter < 80mm steel slags can substitute 1 ton of converter slag-making agent completely -- metallurgy lime, prove, add through industrial applications 20mm≤particle diameter < 80mm steel slags that the recoverying and utilizing method of the steel slag of the present invention is obtained do not have to steel quality and composition Harmful effect, because slag is a kind of " pre- melt ", slugging time advance, shortens the heat 1 minute on the contrary.
Converter smelting slag making principle:
Si+O2=SiO2Si+2FeO=2Fe+SiO2
2CaO+SiO2=2CaOSiO2
2P+5FeO+3CaO=5Fe+Ca3(PO4)2
Desulfurizing agent
Pre- desulfurization principle in molten iron:Contain a large amount of sulphur in molten iron, to mitigate converter desulfurization and the deep desulfurization pressure of refining procedure, Shorten the heat, most of steel plant use molten iron preprocessing station desulphurization and slag skimming, using desulfurizing agents such as pulverized limestone, calcium carbide powders Sulfur content in molten iron is reduced to below 0.08wt% by (main component is CaO), utilizes converter partial desulfurization and LF refining technique Whole desulfurization, below 0.02wt%, the even up to lower clean steel production standard of sulfur content are down to by sulfur content in molten steel.Molten iron Middle sulphur exists in chemical formula FeS forms, desulphurization reaction principle:
FeS+CaO=CaS+FeO
After CaS impurity is separated in molten iron enter slag because slag light specific gravity, floats on molten steel, just than It is easier to remove.Using achievable desulfurizing iron purpose after slag skimming process.
The particle diameter that the recoverying and utilizing method of the steel slag of the present invention is obtained<2mm steel slags substitute metallurgic auxiliary materials desulfurizing agent Principle:Basicity is higher in the remaining refining slag of casting, basicity R=m (CaO)/m (SiO2), CaO mass contents in the slag of basicity >=4 >= 50wt%, sulfur content≤0.04wt%, using 2 tons of particle diameters<2mm steel slags substitute 1 ton of desulfurization flux -- natural lime, not only work Skill is feasible, and can reduce the consumption of natural lime, the exploitation of reduction natural limestone and calcining cost, reduces CO2Greenhouse gas Body is discharged, and experiment is proved, is reduced 1 ton of lime stone of calcining, can be reduced CO20.44 ton of discharge.Because sulfur content is relatively low in casting residue, Molten iron reversion phenomenon is not resulted in yet.Big industrial production test shows:What the recoverying and utilizing method of the steel slag of the present invention was obtained Particle diameter<Calcium oxide content >=42wt% of 2mm steel slags, average activity degree 320~350, moisture content≤1wt%, 18wt%≤ All iron content≤60wt%, applied to feasible on Desulfurization by injecting method and KR mechanical agitation desulfuration techniques.
Sintering circuit flux
The particle diameter that the recoverying and utilizing method of the steel slag of the present invention is obtained<Calcium oxide content >=42wt% of 2mm steel slags, Average activity degree 320~350, moisture content≤1wt%, 18wt%≤all iron content≤60wt% matches somebody with somebody for sintering machine blending ore Ore deposit, matches as 1.5-2.5%, can save sintering deposit raw material purchase cost, realize the short route of cost efficiency and steel slag resource Comprehensive utilization.
High ferro metallurgic auxiliary materials
Make steel cooling agent
It is a kind of pre- melt because steel slag is the accessory substance of Ferrous Metallurgy.The recovery profit of steel slag by the present invention 20mm≤particle diameter < 100mm magnetic separation material, all iron content >=96wt%, sulfur content≤0.04wt%, through big industry are obtained with method Experiment, possesses replacement steel scrap as cooling agent is smelted and uses completely.
From rod mill model:Length=4200mm;Rod iron material:40Cr;Rod iron diameter:Fill rod amount:10-20 tons.Magnet separator magnetic induction:1500-3500Gs.
3mm≤particle diameter < 20mm magnetic separation material is used as steel-making cooling agent
It is a kind of pre- melt because steel slag is the accessory substance of Ferrous Metallurgy.The recovery profit of steel slag by the present invention 3mm≤particle diameter < 20mm magnetic separation material are obtained with method, all iron content >=90wt%, sulfur content≤0.04wt% is tried through big industry Test, possess replacement steel scrap completely as cooling agent is smelted and use.
3mm≤particle diameter < 20mm magnetic separation material is used as steel-making oxidant
It is a kind of pre- melt because steel slag is the accessory substance of Ferrous Metallurgy.The recovery profit of steel slag by the present invention 3mm≤particle diameter < 20mm magnetic separation material are obtained with method, all iron content >=90wt%, sulfur content≤0.04wt% is tried through big industry Test, possess replacement sintering deposit, iron scale completely as oxidant is smelted and use.
It is used as steel-making oxidant, steel-making cooling material after pelletizing
The recoverying and utilizing method of steel slag by the present invention (coordinates winnowing after ball mill crushing grinding, double roller magnetic separation Other machine is the magnetic separation of dry method wind-force) obtain particle diameter < 3mm magnetic separation material, all iron content >=80wt%, sulfur content≤0.04wt%, by it Mixed with waterglass or organic binder bond, waterglass or organic binder bond addition are 7wt%-18wt%, after rolling stirring, warp Ball press is producedAll iron content >=80wt% iron oxide pellet, has some strength through natural curing, as turn Stove oxidant is used in converter smelting mid-term molten steel.After molten steel, clinker boundary are relatively low because of iron oxide content, clinker can go out Existing " returning dry " phenomenon, is unfavorable for impurity removal, has a negative impact to oxygen rifle, now needs to add iron oxide pellet, to increase interface Iron oxide content, increases slag fluidity.Both alternative part cooling material is added after converter the iron oxide pellet, is easy to liquid steel temperature Regulation and composition are uniform, and a pair determination tapping temperature has preferable adjustment effect;The iron oxide pellet is alternatively arranged as the supplement of oxygen, substitutes Part iron ore, sintering deposit and pellet, are a kind of good oxidants, have very good effect to desiliconization and dephosphorization.
From ball mill model:Length=4500mm;Steel ball material:40Mn2;Steel ball size:Ball load:30-50 tons.Steel ball matching is:Accounting 30%;Accounting 40%;Accounting 20%;Accounting 10%.Two roll machine magnetic induction intensity:4000-8000Gs, magnetic Diameter of cylinder=500--850mm, magnet drum length 800--1200mm, material thickness is controlled within 2mm;Compressed air:Nothing Oil is anhydrous, and below pressure 0--0.4MPa is adjustable;Air knife is arranged:Roller axial direction 3 is air knife, and 120 degree of jet angle is adjustable, with magnetic Roller spacing 0--5mm is adjustable.
Embodiment 1 is pre-processed
40 DEG C of slag scums of certain steel mill 100 ton, moisture content is 10wt%, and there are 4 pieces of maximum diameter 300mm slag steel surfaces on surface Accumulated slag reaches 8-12mm, and there are 5 pieces of maximum diameter 220mm slag bulks on surface.After being sufficiently mixed using 50 tons of 300 DEG C of high temperature sludges, pre- place 8 hours reason time, it is found that slag steel surface slag is completely exfoliated, efficiently separating for slag and iron is realized, while it has also been found that bulk Slag all natural degradations, become fritter and graininess, moisture content is 4wt%, calcium oxide content after mixing pretreatment completely 40wt%, all iron content 32wt%.
Embodiment 2 is pre-processed
35 DEG C of slag scums of certain steel mill 250 ton, moisture content is 10wt%, and there are 5 pieces of maximum diameter 280mm slag steel surfaces on surface Accumulated slag reaches 8-12mm, and there are 8 pieces of maximum diameter 220mm slag bulks on surface.After being sufficiently mixed using 100 tons of 230 DEG C of high temperature sludges, pre- place 10 hours reason time, it is found that slag steel surface slag is completely exfoliated, efficiently separating for slag and iron is realized, while it has also been found that bulk Slag all natural degradations, become fritter and graininess, moisture content is 3wt%, calcium oxide content after mixing pretreatment completely 50wt%, all iron content 30wt%.
Embodiment 3 is pre-processed
30 DEG C of slag scums of certain steel mill 150 ton, moisture content is 10wt%, after being sufficiently mixed using 50 tons of 100 DEG C of high temperature sludges, Pretreatment time 12 hours, it is found that slag steel surface slag is completely exfoliated, realize efficiently separating for slag and iron, while it has also been found that Bulk slag all natural degradations, become fritter and graininess, moisture content is 5wt%, calcium oxide content after mixing pretreatment completely 62wt%, all iron content 31wt%.
The slag former of embodiment 4
Turn over slag point from certain steel mill's conticaster and retract 10 tank casting residue, 18 tons of temperature for 120 DEG C, through with 37 tons of 40 DEG C of casting residues Mixing pretreatment 10 hours simultaneously is interrupted watering cooling, remove casting residue steel after moisture content be 4wt%, calcium oxide content 62wt%, All iron content 20wt%.Then carry out the first screening and obtain 5 tons of particle diameters >=250mm steel scraps and 50 tons of particle diameter < 250mm steel slags, 50 tons of particle diameter < 250mm steel slags carry out first time magnetic separation and obtain 3 tons of particle diameter < 250mm magnetic separation material and 47 tons of particle diameter < 250mm First time magnetic separation steel slag, particle diameter < 250mm first time magnetic separation steel slag carries out second of screening and obtains 27 tons of particle diameters<80mm steel Scum and 20 tons of 80mm≤particle diameter < 250mm steel slags, 80mm≤particle diameter < 250mm steel slags after crushing with particle diameter<80mm Steel slag carries out second of magnetic separation and obtains second of magnetic separation steel slag of 7 tons of particle diameter < 80mm magnetic separation material and 40 tons of particle diameter < 80mm, Second of magnetic separation steel slag of particle diameter < 80mm carries out third time screening and obtains 20 tons of particle diameters<20mm steel slags and 20 tons of 20mm≤grains Footpath < 80mm steel slags, particle diameter<20mm steel slags carry out third time magnetic separation and obtain 1 ton of particle diameter < 20mm magnetic separation material and 19 tons of particle diameters < 20mm third time magnetic separation steel slags, the third time magnetic separation steel slag carries out the 4th screening and obtains 2 tons of particle diameters<2mm steels Slag and 17 tons of 2mm≤particle diameter < 20mm steel slags, 2mm≤particle diameter < 20mm steel slags carry out third time magnetic separation after crushing, weight New to utilize, flow chart is shown in Fig. 1.
By group technology:Multiple magnetic separation, repeatedly screening, the repeatedly method such as broken obtain 20 tons of 20mm≤particle diameter < 80mm Steel slag, after testing, this steel slag moisture content are 1wt%, and CaO content is 45wt%, and average activity degree 280, basicity 3.0 is somebody's turn to do 20mm≤particle diameter < 80mm steel slags are transported to converter high hopper using belt elevator, divide 5 times and mix addition with other slag formers In converter, per 4 tons of stove, from the point of view of smelting process, with slugging effect in advance, can rapid slagging, desiliconization, dephosphorization effect are obvious. Detected through converter lining, in advance after slag making, reduce the content of silicon and phosphorus in slag, reduce acid slag to lining wear, converter lining The spray repair time shortens 10%, and spray repair amount reduces 12%, adds 2 tons of the slag formers such as metallurgy lime less per stove, and the duration of heat shortens 1 point Clock, molten steel composition also no abnormality seen, it is seen that substitute slag former effect obvious.
The desulfurizing agent of embodiment 5 or sintering circuit flux
Pass through the recoverying and utilizing method of the steel slag of embodiment 1:Multiple magnetic separation, repeatedly screening, the repeatedly method such as broken are obtained To 19 tons of particle diameter < 2mm steel slags, after testing, the CaO content of this steel slag is 52wt%, average activity degree 330, basicity 3.2, All iron content 18wt%.The steel slag is transported between pretreatment desulfurizing using groove tank car, using Desulfurization by injecting method technique, random examination 5 tank molten iron are tested, lime injection casting residue powder ratio is substituted and is gradually progressively increased by 10%-50%, stove molten iron is blended into by steel making working procedure Detection, no abnormality seen entirely reaches pre- desulfurization standard, it is seen that substitute desulfurizing agent effect obvious.
19 tons of particle diameter < 2mm steel slags, after testing, the CaO content of this steel slag is 52wt%, basicity 3.2, all iron content More than 18wt%, proportioning 2% is added in blending ore, for preparing sintering deposit, alternative sintering auxiliary material dolomite and agstone, Sinter quality and composition do not change before and after addition steel-making slag powder in sintering deposit.
It is used as steel-making oxidant after the pelletizing of embodiment 6
3 tons of particle diameter < 250mm magnetic separation material, 7 tons of particle diameter < are obtained by the recoverying and utilizing method of the steel slag of embodiment 1 Magnetic separation removal tailings, which is carried out, after 80mm magnetic separation material and 1 ton of particle diameter < 20mm magnetic separation material mixing obtains 11 tons of mixing magnetic separation material;Mixing Magnetic separation material sieve obtaining 9 tons of particle diameters >=20mm magnetic separation material and 2 tons of particle diameter < 20mm magnetic separation material;Particle diameter >=20mm magnetic separation material warp Magnetic separation removal tailings is carried out after grinding and screening and obtains 6 tons of 20mm≤particle diameter < 100mm magnetic separation material;Particle diameter < 20mm magnetic separation material dries Magnetic separation and screening are carried out after dry and grinding, 1.1 tons of 3mm≤particle diameters are obtained<20mm magnetic separation material and 0.9 ton of particle diameter < 3mm magnetic separation material. Particle diameter < 3mm magnetic separation material obtain 0.7 ton of particle diameter < 3mm, bis- magnetic separation material through dry method wind-force magnetic separation, and flow chart is shown in Fig. 2.By its with Waterglass or organic binder bond mixing, waterglass or organic binder bond addition are 18%, after rolling stirring, are produced through ball press 0.7 ton of iron oxide pellet, particle diameterMoisture content 1wt%, sampled chemical examination, all iron content 82wt%.By the iron oxide pellet 24 Ton is transported to converter high hopper using belt elevator, smelts mid-term in every stove, adding when " returning dry " occurs in clinker, per 3 tons of stove, with Track adds the 8 whole converting processes of stove molten steel and the liquid steel sampling analysis of iron oxide pellet, no abnormality seen, and every stove and compares and add iron ore less 2.7 tons of the oxidants such as stone, sintering deposit or pellet, play cost efficiency effect.
Embodiment 73mm≤particle diameter < 20mm magnetic separation material is used as steel-making oxidant
It is above-mentioned to obtain 1.1 tons of 3mm≤particle diameters<20mm magnetic separation material, moisture content 1wt%, sampled chemical examination, all iron content 92wt%.The magnetic separation material is run up into point 8 stoves after 24 tons together to add with steel scrap, 3 tons are added per stove, tracking adds magnetic separation material The 8 whole converting processes of stove molten steel and liquid steel sampling analysis, no abnormality seen, and every stove are compared and add iron ore, sintering deposit or pelletizing less 2.7 tons of the oxidants such as ore deposit, play cost efficiency effect.

Claims (7)

1. a kind of recoverying and utilizing method of steel slag, it is characterised in that comprise the following steps:
Carried out after more than (1) 100 DEG C steel slag and the mixing pretreatment of 30 DEG C of -40 DEG C of steel slags screening for the first time obtain particle diameter >= 250mm steel scraps and particle diameter < 250mm steel slags;
(2) the particle diameter < 250mm steel slags carry out first time magnetic separation and obtain particle diameter < 250mm magnetic separation material and particle diameter < 250mm First time magnetic separation steel slag;
(3) the first time magnetic separation steel slag carries out second of screening and obtains particle diameter<80mm steel slags and 80mm≤particle diameter < 250mm steel slags;
(4) particle diameter<80mm steel slags carry out second of magnetic separation and obtain particle diameter < 80mm magnetic separation material and particle diameter < 80mm second Secondary magnetic separation steel slag;
(5) second of magnetic separation steel slag carries out third time screening and obtains particle diameter<20mm steel slags and 20mm≤particle diameter < 80mm steel slags, the 20mm≤particle diameter < 80mm steel slags are used as slag former;
(6) particle diameter<20mm steel slags carry out third time magnetic separation and obtain particle diameter < 20mm magnetic separation material and particle diameter < 20mm the 3rd Secondary magnetic separation steel slag;
(7) the third time magnetic separation steel slag carries out the 4th screening and obtains particle diameter<2mm steel slags and 2mm≤particle diameter < 20mm Steel slag, the particle diameter<2mm steel slags are used as desulfurizing agent or sintering circuit flux;
The mass ratio of more than the 100 DEG C steel slags and described 30 DEG C of -40 DEG C of steel slags is 1:2-3, pretreatment time 8-12 is small When;Moisture content is below 5wt%, oxidation after more than the 100 DEG C steel slags and 30 DEG C of -40 DEG C of steel slags mixing pretreatment Calcium content 40wt%-62wt%, all iron content >=20wt%.
2. the recoverying and utilizing method of steel slag according to claim 1, it is characterised in that 80mm described in step (3)≤ Particle diameter < 250mm steel slags return to step (3) after crushing, or second of magnetic separation is carried out to step (4).
3. the recoverying and utilizing method of steel slag according to claim 1, it is characterised in that 2mm≤grain described in step (7) Return to step (6) is re-used footpath < 20mm steel slags after crushing.
4. the recoverying and utilizing method of steel slag according to claim 1, it is characterised in that the 20mm≤particle diameter < 80mm Calcium oxide content >=42wt% of steel slag, average activity degree 260~300, moisture content≤2wt%, the particle diameter<2mm steels Calcium oxide content >=42wt% of slag, average activity degree 320~350, moisture content≤1wt%, 18wt%≤all iron content≤ 60wt%.
5. the recoverying and utilizing method of steel slag according to claim 1, it is characterised in that also comprise the following steps:
(8) by the 250mm magnetic separation of particle diameter < described in claim 1 material, the particle diameter < 80mm magnetic separation material and the particle diameter < Magnetic separation removal tailings is carried out after the mixing of 20mm magnetic separation material to obtain mixing magnetic separation material;
(9) the mixing magnetic separation material sieve obtaining particle diameter >=20mm magnetic separation material and particle diameter < 20mm magnetic separation material;
(10) particle diameter >=20mm magnetic separation material are ground obtains 20mm≤particle diameter < with progress magnetic separation removal tailings after screening 100mm magnetic separation material, the 20mm≤particle diameter < 100mm magnetic separation material is used as steel-making cooling agent;
(11) magnetic separation and screening are carried out after the drying of particle diameter < 20mm magnetic separation material and grinding, obtains 3mm≤particle diameter<20mm magnetic separation Material and particle diameter < 3mm magnetic separation material, the 3mm≤particle diameter<20mm magnetic separation material is used as steel-making oxidant or steel-making cooling agent.
6. the recoverying and utilizing method of steel slag according to claim 5, it is characterised in that the particle diameter < 3mm magnetic separation material Obtain being used as steel making oxygen after bis- magnetic separation material of particle diameter < 3mm, described bis- magnetic separation material pelletizings of particle diameter < 3mm through dry method wind-force magnetic separation Agent or cooling agent.
7. the recoverying and utilizing method of steel slag according to claim 6, it is characterised in that the 20mm≤particle diameter < All iron content >=96wt% of 100mm magnetic separation material, sulfur content≤0.04wt%, the 3mm≤particle diameter<The full iron of 20mm magnetic separation material Content >=90wt%, sulfur content≤0.04wt%, all iron content >=80wt% of described bis- magnetic separation material of particle diameter < 3mm, sulfur-bearing Amount≤0.04wt%.
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