CN110055370A - A kind of new type high temperature steel slag modification agent and modified pretreating process - Google Patents
A kind of new type high temperature steel slag modification agent and modified pretreating process Download PDFInfo
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- CN110055370A CN110055370A CN201910357977.1A CN201910357977A CN110055370A CN 110055370 A CN110055370 A CN 110055370A CN 201910357977 A CN201910357977 A CN 201910357977A CN 110055370 A CN110055370 A CN 110055370A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
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Abstract
The invention discloses a kind of new type high temperature steel slag modification agent and modified pretreating process, belong to steel slag technical field of modification.It includes silicon matter containing simple substance and carbonizable substance containing simple substance, simple substance silicone content >=60% in the silicon matter containing simple substance；Simple substance carbon content >=80% in the carbonizable substance containing simple substance.Invention additionally discloses a kind of modified pretreating process of new type high temperature steel slag, comprising the following steps: 1) carbonizable substance containing simple substance and silicon matter containing simple substance are previously added into slag ladle；2) when converter is slagged tap, then silicon matter containing simple substance is added simultaneously into slag ladle；3) after slagging tap, the nitrogen blowing into material is collected simultaneously the dust of generation；4) treated the steel slag of nitrogen flushing in step 3) is subjected to the bored processing of heat.The present invention can effectively improve steel slag stability, grindability and improve the slag steel rate of recovery.
Description
Technical field
The invention belongs to steel slag technical field of modification, more specifically to a kind of new type high temperature steel slag modification agent and change
Property pretreating process.
Background technique
Currently, the accumulative stockpiling steel slag in China surpasses 1,000,000,000 tons, by producing per year based on 800,000,000 tons of crude steel, steel slag amount about 100,000,000 is increased newly every year
Ton, the comprehensive resource utilization rate of steel slag removes recycling wherein ferrous material less than 30% at present, and on a small quantity for cement, road etc.
Effective use is not yet received more than steel tailings after the magnetic separation of steel slag total amount 70% in aspect, the steel slag land occupation largely stored up, together
When contaminated soil, increase dust concentration etc. in atmosphere.Steel slag utilization is comprehensive utilization of resources, and is curbed environmental pollution.
The problems such as steel slag complicated component, grindability are poor, stability is poor and early strength is low is to restrict Comprehensive Utilization of Steel Slag to utilize
Key factor need to be by being modified to steel slag therefore fundamentally to solve the problems, such as steel slag utilization, there are many correlations in the country
Research, but since the high temperature modified difficulty of steel slag is big, many researchs only rest on laboratory research stage, industrializing implementation difficulty
Greatly, it is primarily present modifying agent adding manner, homogenizes and the solution that has not had the problems such as temperature is supplemented.
Disclosed in prior art CN104673965A " a kind of online method of modifying of liquid steel slag " it is a kind of using a kind of or
A variety of carbonate materials are added directly into high-temperature liquid state steel slag as modifying agent, using high-temperature steel slag sensible heat to carbonic acid salinity
Solution while the basicity for improving steel slag, modified steel slag is returned and is used as converter slag-making agent.The invention mainly passes through modified raising
Improving steel slag basicity makes it have preferable dephosphorization effect, to realize steel slag recycling in converter procedure, but follows
Steel slag will necessarily face outlet problem after ring to certain number, finally or consider that the comprehensive utilization of steel slag in other aspects is asked
Topic, and outlet steel slag basicity is higher, causes bigger difficulty, this hair along with the comprehensive utilization subsequent to steel slag of high-content free CaO
It is bright not provide concrete scheme.
In the utility model patent " the steam pressure reaction kettle for steel slag modification " of Authorization Notice No. CN203582742U
A kind of steam pressure reaction kettle for steel slag modification is disclosed, calcium oxide, magnesia in steam in reaction kettle and steel slag are passed through
Equal substances chemically reactive during steam pressure eliminates steel slag volume expansion and realizes granulating steel slag simultaneously, the utility model and public affairs
Description in the prior art " a kind of vertical steel slag has the bored still kettle of pressure heat and process for treating steel slag " that the number of opening is CN105063255A
Still kettle principle it is similar, such method and device has certain effect to the improvement of steel slag stability and granulation effect, but needs
Liquid steel slag is pre-processed, and invested and operating cost is higher, and according to current operative practice from the point of view of, the bored steel slag of heat is free
CaO content 2%~3% is still difficult to eliminate it and is used for institute in terms of road and building materials although more traditional hot application decreases
The stability hidden danger faced.
A kind of prior art " steel slag stability modification agent and the steel slag stability processing side of Publication No. CN101328517A
Method " in a kind of steel slag stability modification agent being made of one or more of blast furnace slag, quartz sand, river sand mixture and logical
The method that the mode of over-blowing nitrogen gas stirring carries out steel slag modification.This method can be stable so as to improve steel slag by reducing steel slag basicity
Property, but being blown into oxygen can make iron element oxidation in steel slag reduce iron element recycling in steel slag, and simultaneous oxidation iron and CaO in slag etc. are nonmetallic
Component combines and forms the low gelation activity mineral of the high rigidity such as calcium ferrite, influences the comprehensive utilization of steel slag following resource.
Prior art CN105110660A discloses molten steel slag reduction hardening and tempering method, system under a kind of reducing atmosphere
Standby process is: steel slag and reproducibility component first being adjusted material fragmentation, grinding to 200~400m of Blain specific surface2/ kg, mixes
Enter suitable quantity of water, be pressed into test cake after mixing, dry, is subsequently placed in reducing atmosphere high temperature furnace and is calcined (when test, first
High-temperature electric resistance furnace is vacuumized), 1300~1600 DEG C of calcination temperature, soaking time 30min or more under atmosphere protection make each
Component chemically reacts at high temperature, and the material after reduction is finally prepared modified steel ground-slag through cooling, broken, grinding.
The prior art is on the one hand by the Fe in steel slag2O3, FeO is reduced into fe, and can on the other hand be divided iron aluminium calcium phase
Solution, releases CaO, and the two is conducive to the formation of the silicate mineral of high gelation activity, inherently optimizes the mineral of steel slag
Composition, improves the gelation activity of steel slag.The rate of recovery of fe is improved in the prior art, but is not dissociated in steel slag
CaO problem takes respective handling measure, and there is no the stability problems for solving steel slag for the technology.
Summary of the invention
1. solving the problems, such as
For the technical problem of the modified pretreating effect difference of steel slag in prior art, the present invention provides a kind of new type high temperature steel
Slag is modified pretreating process, improves steel slag stability, grindability and improves the slag steel rate of recovery.
2. technical solution
To solve the above-mentioned problems, the technical solution adopted in the present invention is as follows:
A kind of new type high temperature steel slag modification agent, including silicon matter containing simple substance and carbonizable substance containing simple substance, the object containing elemental silicon
Simple substance silicone content >=60% in matter；Simple substance carbon content >=80% in the carbonizable substance containing simple substance.
Preferably, the weight ratio of elemental silicon and simple substance carbon is (10~30) in the modification agent: 1.
Preferably, simple substance silicone content is the 3~5% of steel slag weight to be processed in the modification agent.
Preferably, the carbonizable substance containing simple substance is one of graphite, active carbon, bituminous coal, anthracite, lignite, gangue
Or it is several.
Preferably, the silicon matter containing simple substance is one or more of silicon powder, industrial silicon, ferrosilicon.
A kind of modified pretreating process of new type high temperature steel slag, comprising the following steps:
1) carbonizable substance containing simple substance and silicon matter containing simple substance are previously added into slag ladle；
2) when converter is slagged tap, then silicon matter containing simple substance is added simultaneously into slag ladle；
3) after slagging tap, the nitrogen blowing into material is collected simultaneously the dust of generation；
4) treated the steel slag of nitrogen flushing in step 3) is subjected to the bored processing of heat.
Preferably, described in step 1) in carbonizable substance containing simple substance simple substance carbon content be steel slag weight to be processed 0.1~
0.3%.
Preferably, simple substance silicone content is the 3~5% of steel slag weight to be processed in silicon matter containing simple substance described in step 1).
Preferably, the silicon matter containing simple substance is added in step 1) and the quality of the silicon matter containing simple substance is added in step 2)
Than for 1:2.
Preferably, the carbonizable substance containing simple substance and material particle size containing elemental silicon control between 0.5~2mm.
Preferably, silicon matter containing simple substance described in step 2) is added simultaneously with steel slag and is finished.
Preferably, the pressure of the step 3) nitrogen blowing is 0.5~0.7MPa.
Preferably, dust collection cover, collection step 3 are set above slag ladle) dust.
3. beneficial effect
Compared with the prior art, the invention has the benefit that
(1) present invention realizes that high-temperature liquid state steel slag is high temperature modified, reduces steel slag by modification agent of the addition containing elemental silicon
Basicity and free CaO content improve steel slag grindability and gelling, and the wherein effect of elemental silicon has three: the first, elemental silicon and steel
Iron oxide, is reduced into the recycling that iron may be implemented after iron by the iron oxide reaction in slag；Second, while reaction, the two of generation
Silica can further react the silicate mineral for generating high gelation activity, modified pre- place with the calcium oxide to dissociate in steel slag
Steel slag after reason, silicate content is high, and gelation activity is significantly improved after grinding slag micro powder；Third, due to the two of generation
The endothermic reaction occurs for silica and calcium oxide, declines system temperature, the process of simultaneous elemental silicon reducing iron oxides is
System provides heat compensation, makes system that cold conditions modification agent be avoided to be added and lead to temperature loss.
(2) due to the height of material cost containing elemental silicon, cost is pre-processed to reduce, therefore simple substance is substituted using part simple substance carbon
Silicon；For the iron oxide in partial reduction steel slag；Be added a small amount of elemental silicon, the silica that reducing iron oxides generate again with oxygen
Change the silicate mineral that calcium reaction generates high gelation activity.
(3) simple substance silicone content >=60% in modification agent of the present invention, this is to cause to introduce in order to avoid amount containing elemental silicon is too low
Impurity it is excessive and influence the property of modified steel slag, while guaranteeing that modification agent provides enough SiO in modifying process2To reduce
Steel slag basicity, to reduce steel slag free CaO content, while elemental silicon is by FeOnIt can be provided while equal compound oxidations
Heat compensation.
(4) in modification agent of the present invention in carbonizable substance containing simple substance simple substance carbon content >=80%, this is in order to avoid containing simple substance
Carbon amounts is too low to be caused the impurity introduced excessive and influences the property of modified steel slag, while guaranteeing modification agent shape during the reaction
At good reducing atmosphere, while reducing ash content and impurity is brought into.
(5) weight ratio of elemental silicon and simple substance carbon is (10~30) in the present invention preferably modification agent: 1, this is because steel slag
For middle iron oxide content between 20~30%, calcium oxide content is therefore following according to what is mainly occurred generally between 35~50%
Several reactions:
2Fe2O3+3C→4Fe+3CO2
2FeO+C→2Fe+CO2
2Fe2O3+3Si→4Fe+3SiO2
2FeO+Si→2Fe+SiO2
2CaO+SiO2→Ca2SiO4
The weight ratio of elemental silicon and simple substance carbon is obtained in (10~30): when 1, can either guarantee the elimination of free calcium oxide,
Even if again reducing atmosphere can be thoroughly mixed to form by material when steel slag is added, modified effect is further increased.
(6) the modified pretreating process of a kind of new type high temperature steel slag of the invention will contain simple substance carbonizable substance and containing simple substance first
Silicon matter is added separately in slag ladle, and the purpose is to consider that the specific gravity of carbonizable substance containing simple substance is small, burning becomes gas under high temperature, is being connect
Slag is first placed it in front of slag and fills bottom, may advantageously facilitate the haptoreaction of ferriferous oxide in carbonizable substance containing simple substance and steel slag, steel slag
A large amount of CO is generated with carbon Contact2；Elemental silicon modification agent is charged first to slag before slag and fills bottom, utilizes early period of slagging tap
High-temperature steel slag falls into slag and fills the impact effect and a large amount of CO that bottom is formed2Gas plays certain stirring action, forms reproducibility
Atmosphere is more conducive to the haptoreaction of modification agent and steel slag；Again when converter is slagged tap, then it is added simultaneously into slag ladle and contains simple substance
Silicon matter, its object is to using high-temperature steel slag and modification agent synchronize fall into the mixed process of slag filling, improve modification agent in steel slag
In distributing homogeneity and haptoreaction effect；After slagging tap, the nitrogen blowing into material is avoided used in the prior art
It is upgraded the metallic iron oxidation by air of agent reduction during blowing air caused early period, and being blown into for nitrogen makes modification agent more
Good fusing, while mixing effect can be played, improve modification effect；It is collected simultaneously the dust of generation, avoids dust pollution.
(7) two kinds of modification agent (siliceous objects are added by passing through batch can feed near slag-drip opening when converter is slagged tap in the present invention
Matter and carbonizable substance containing simple substance), it realizes that high-temperature liquid state steel slag is high temperature modified, reduces steel slag basicity and free CaO content, improve steel slag
Grindability and gelling；Pretreatment is modified to steel slag by the method for the present invention in embodiment 1, after treatment, steel slag middle reaches
Modified 1.1% is down to by 2.6% before being modified from CaO content；Steel slag is modified, after removing fe, puts down in steel slag
Equal iron-content drops to 19.2% by 25.3%, it is known that the rate of recovery of fe obtains larger raising；Slag micro powder is ground by mark
Quasi- testing result shows, 7d activity index 70~73%, 28d activity index 85~91%, and more unmodified steel slag significantly improves.
Detailed description of the invention
Fig. 1 is the modified pretreating process schematic diagram of novel steel slag of the present invention；
In figure: 1, converter；2, modification agent A batch can；3, modification agent B batch can；4, slag ladle；5, flat car；6, metal tube；7, nitrogen
Gas；8, dust gathering arrester.
Specific embodiment
The present invention is further described below combined with specific embodiments below.
Embodiment 1
The coal dust and simple substance silicone content that the present embodiment high temperature steel slag modification agent is 83% by simple substance carbon content are 72%
Silicon powder composition, coal powder size are 0.5~1.5mm, and silicon particle size is 1~2mm.
Coal dust additive amount is the 0.2% of steel slag weight, and silicon powder total addition level is the 5% of steel slag weight, i.e., simple substance C is practical adds
Dosage is the 0.166% of slag weight, and elemental silicon actual interpolation amount is the 3.6% of slag weight.
As shown in Figure 1, being loaded with below the flat car to converter mouth of slag ladle, converter 1 starts to slag tap, while beside slag ladle
Feed bin equipped with modification agent is set, and the silicon-containing material A in modification agent and substance B containing simple substance carbon are separately stored in modification agent A feed bin 2
It with modification agent B feed bin 3, is fed by feed bin screw feeder meter, material inlet is located above 4 tank mouth of slag slag ladle at about 1 meter.It blows
In process, dust collection cover is set above the slag ladle of slag ladle nitrogen blowing operation area.
1) it when 300t converter is slagged tap, is calculated by quantity of slag 30t, before 4 slag of slag ladle, first opens modification agent B feed bin 3 and be fed
Valve is added modification agent B (coal dust, simple substance carbon content are 83%, and granularity is 0.5~1.5mm) in 0.2% ratio of the quantity of slag, adds up about
0.06 ton, later by 1/3 about 0.5t modification agent A of the silicon matter containing simple substance (being silicon powder in the present embodiment) in modification agent A feed bin 2
(silicon powder, simple substance silicone content are 72%, and granularity is 1~2mm) is added to 4 bottom of slag ladle, starts slag, and take in converter 1 and slag tap
Sample detection, TFe content 25.3%；
2) while converter 1 is slagged tap, remaining 2/3 silicon matter containing simple substance (simple substance silica flour) is added simultaneously into slag ladle 4
1t, control silicon powder flow are allowed to complete addition before 1 deslagging of converter terminates；
3) after the completion of modification agent addition, slag ladle 4 is transported to by air blowing operation station between Slag treatment using flat car 5 immediately,
Ensure that dust gathering arrester 8 is in running order before the beginning of nitrogen blowing 7, the metal tube 6 for connecting nitrogen is inserted into slag ladle 4 starts immediately
Nitrogen blowing 7, pressure 0.6MPa, until modification agent is completely melt and is stirred evenly；
4) after nitrogen flushing gas agitating, slag ladle is hoisted to the bored operation area of heat, heat bored processing is carried out and is obtained after the bored processing of heat
To pretreated steel slag.
Pretreated steel slag recycles fe by magnetic again, after the slag micro powder, through detecting, and free CaO content
1.1%, specific surface area 410m2/ kg, TFe content 19.2% in steel-making slag powder, according to GB/T20491-2006 " for cement and mixed
Steel-making slag powder in solidifying soil " standard testing result see the table below 1.
1 embodiment of table, 1 modified steel scoria and its steel-making slag powder activity index
The result shows that: relative to unmodified steel-making slag powder, through the modified steel-making slag powder of the method for the present invention, free CaO content drop
Low 1.5%, TFe, which reduces 6.2%, 7d activity index and improves 4%, 28d activity index, in steel-making slag powder improves 8%.
Comparative example 1
This comparative example and 1 step of embodiment are essentially identical, the difference is that: use silicon powder (simple substance silicone content 72%) generation
For the coal dust of step 1), additive amount 0.069t, i.e. the 0.23% of steel slag weight, practical elemental silicon additive amount is slag weight
0.166%.
Pretreated steel slag recycles fe by magnetic again, after steel slag tailings are milled into micro mist, is detected, and dissociates
CaO content 1.5%, specific surface area 410m2/ kg, TFe content 21.3% in steel-making slag powder " are used for water according to GB/T20491-2006
Steel-making slag powder in mud and concrete " standard testing result see the table below 2.
2 comparative example of table, 1 modified steel scoria and its steel-making slag powder activity index
The result shows that the coal dust being added in step 1) in embodiment 1 plays crucial work to the mixing of silicon powder and steel slag
With after pre-added coal dust is changed to silicon powder, although also having reducing property, it with steel slag there is no being sufficiently mixed, not
The SiO that iron oxide can be sufficiently restored, and be formed2Fail sufficiently to react, the fe of recycling is less, iron in modified steel-making slag powder
Content is still higher；The reduction amplitude of free CaO is smaller, is unfavorable for subsequent utilization.
Comparative example 2
This comparative example and 1 step of embodiment are essentially identical, the difference is that: it is not previously incorporated coal dust and part silicon powder,
Directly coal dust, silicon powder and steel slag are added in slag ladle simultaneously.
Pretreated steel slag recycles fe by magnetic again, after the slag micro powder, through detecting, and free CaO content
1.4%, specific surface area 410m2/ kg, TFe content 20.9% in steel-making slag powder, according to GB/T20491-2006 " for cement and mixed
Steel-making slag powder in solidifying soil " standard testing result see the table below 3.
3 comparative example of table, 2 modified steel scoria and its steel-making slag powder activity index
The result shows that the coal dust being previously added in 1 step 1) of embodiment plays key to the mixing of silicon powder and steel slag
Effect, connects and is added to coal dust, silicon powder and steel slag in slag ladle simultaneously, although also having reducing property, reduction effect is slightly poor, returns
The fe of receipts is less, and iron content is still higher in modified steel-making slag powder；The reduction amplitude of free CaO is smaller, after being equally unfavorable for
Continuous utilization.
Embodiment 2
The present embodiment and 1 step of embodiment are essentially identical, the difference is that:
The industrial silicon that the active carbon and simple substance silicone content that modification agent is 91% by simple substance carbon content in the present embodiment are 93%
Composition, granularity of activated carbon are 1~2mm, and industrial silicon granularity is 1~2mm；
Activated carbon addition is the 0.27% of steel slag weight, and industrial silicon total addition level is the 5.4% of steel slag weight, i.e. simple substance
C actual interpolation amount is the 0.25% of slag weight, and elemental silicon actual interpolation amount is the 5% of slag weight；
The pressure of step 3) nitrogen blowing is 0.7MPa.
Pretreated steel slag recycles fe by magnetic again, after the slag micro powder, " uses according to GB/T20491-2006
Steel-making slag powder in cement and concrete " standard testing result see the table below 4.
4 embodiment of table, 2 modified steel scoria and its steel-making slag powder activity index
The result shows that: relative to unmodified steel-making slag powder, through the modified steel-making slag powder of the method for the present invention, free CaO content drop
Low 61.5%, TFe, which reduces 24.9%, 7d activity index and improves 10.3%, 28d activity index, in steel-making slag powder improves
2.5%.
Embodiment 3
The present embodiment and 1 step of embodiment are essentially identical, the difference is that:
The ferrosilicon that the bituminous coal and simple substance silicone content that modification agent is 85% by simple substance carbon content in the present embodiment are 75% forms,
Bituminous coal granularity is 0.5~2.0mm, and ferrosilicon granularity is 1~2mm；
Bituminous coal additive amount is the 0.35% of steel slag weight, and ferrosilicon total addition level is the 4% of steel slag weight, i.e. simple substance C is practical
Additive amount is the 0.3% of slag weight, and elemental silicon actual interpolation amount is the 3% of slag weight；
The pressure of step 3) nitrogen blowing is 0.5MPa.
Pretreated steel slag recycles fe by magnetic again, after the slag micro powder, " uses according to GB/T20491-2006
Steel-making slag powder in cement and concrete " standard testing result see the table below 5.
5 embodiment of table, 3 modified steel scoria and its steel-making slag powder activity index
The result shows that: relative to unmodified steel-making slag powder, through the modified steel-making slag powder of the method for the present invention, free CaO content drop
Low 38.5%, TFe, which reduces 19.0%, 7d activity index and improves 2.9%, 28d activity index, in steel-making slag powder improves
1.2%.
Embodiment 4
The present embodiment and 1 step of embodiment are essentially identical, the difference is that:
The ferrosilicon that the bituminous coal and simple substance silicone content that modification agent is 85% by simple substance carbon content in the present embodiment are 75% forms,
Bituminous coal granularity is 0.5~2.0mm, and ferrosilicon granularity is 1~2mm；
Bituminous coal additive amount is the 0.12% of steel slag weight, and ferrosilicon total addition level is the 4% of steel slag weight, i.e. simple substance C is practical
Additive amount is the 0.1% of slag weight, and elemental silicon actual interpolation amount is the 3% of slag weight；
Pretreated steel slag recycles fe by magnetic again, after the slag micro powder, " uses according to GB/T20491-2006
Steel-making slag powder in cement and concrete " standard testing result see the table below 6.
6 embodiment of table, 4 modified steel scoria and its steel-making slag powder activity index
The result shows that: relative to unmodified steel-making slag powder, through the modified steel-making slag powder of the method for the present invention, free CaO content drop
Low 38.5%, TFe, which reduces 15.0%, 7d activity index and improves 5.9%, 28d activity index, in steel-making slag powder improves
2.5%.
Embodiment 5
The present embodiment and 1 step of embodiment are essentially identical, the difference is that:
The ferrosilicon group that the anthracite and simple substance silicone content that modification agent is 85% by simple substance carbon content in the present embodiment are 75%
At smokeless coal particle size is 0.5~2mm, and ferrosilicon granularity is 1~2mm；
Anthracite additive amount is the 0.23% of steel slag weight, and ferrosilicon total addition level is the 5.33% of steel slag weight, i.e. simple substance C
Actual interpolation amount is the 0.2% of slag weight, and elemental silicon actual interpolation amount is the 4% of slag weight；
Pretreated steel slag recycles fe by magnetic again, after the slag micro powder, " uses according to GB/T20491-2006
Steel-making slag powder in cement and concrete " standard testing result see the table below 7.
7 embodiment of table, 5 modified steel scoria and its steel-making slag powder activity index
The result shows that: relative to unmodified steel-making slag powder, through the modified steel-making slag powder of the method for the present invention, free CaO content drop
Low 57.7%, TFe, which reduces 19.8%, 7d activity index and improves 10.8%, 28d activity index, in steel-making slag powder improves
4.9%.
Claims (10)
1. a kind of new type high temperature steel slag modification agent, which is characterized in that described to contain including silicon matter containing simple substance and carbonizable substance containing simple substance
Simple substance silicone content >=60% in simple substance silicon matter；Simple substance carbon content >=80% in the carbonizable substance containing simple substance.
2. new type high temperature steel slag modification agent according to claim 1, which is characterized in that elemental silicon and list in the modification agent
The weight ratio of matter carbon is (10~30): 1.
3. new type high temperature steel slag modification agent according to claim 1, which is characterized in that simple substance silicone content in the modification agent
It is the 3~5% of steel slag weight to be processed.
4. new type high temperature steel slag modification agent according to claim 1, which is characterized in that the carbonizable substance containing simple substance is stone
One or more of ink, active carbon, bituminous coal, anthracite, lignite, gangue.
5. new type high temperature steel slag modification agent according to claim 1, which is characterized in that the silicon matter containing simple substance is silicon
One or more of powder, industrial silicon, ferrosilicon.
6. a kind of modified pretreating process of new type high temperature steel slag, which comprises the following steps:
1) carbonizable substance containing simple substance and silicon matter containing simple substance are previously added into slag ladle；
2) when converter is slagged tap, then silicon matter containing simple substance is added simultaneously into slag ladle；
3) after slagging tap, the nitrogen blowing into material is collected simultaneously the dust of generation；
4) treated the steel slag of nitrogen flushing in step 3) is subjected to the bored processing of heat.
7. the modified pretreating process of new type high temperature steel slag according to claim 6, which is characterized in that step 1) is described containing single
Simple substance carbon content is the 0.1~0.3% of steel slag weight to be processed in matter carbonizable substance.
8. the modified pretreating process of new type high temperature steel slag according to claim 6, which is characterized in that step 1) is described containing single
Simple substance silicone content is the 3~5% of steel slag weight to be processed in matter silicon matter.
9. the modified pretreating process of new type high temperature steel slag according to claim 6, which is characterized in that institute is added in step 1)
The mass ratio for stating silicon matter containing simple substance and step 2) the addition silicon matter containing simple substance is 1:2.
10. the new type high temperature steel slag according to any one of claim 6~9 is modified pretreating process, which is characterized in that
The pressure of the step 3) nitrogen blowing is 0.5~0.7 MPa.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111850193A (en) * | 2020-08-04 | 2020-10-30 | 中冶节能环保有限责任公司 | Online quenching and tempering device and method for slag discharging and cooling process of molten steel slag |
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| CN114907028A (en) * | 2021-02-10 | 2022-08-16 | 上海梅山钢铁股份有限公司 | Steel slag modifier and method for modifying converter steel slag |
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| CN114292971A (en) * | 2022-01-07 | 2022-04-08 | 广西柳钢环保股份有限公司 | Novel steel slag treatment method |
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