CN108148942A - A kind of converter slag stays slag gasification dephosphorization method and recycles smelting process - Google Patents
A kind of converter slag stays slag gasification dephosphorization method and recycles smelting process Download PDFInfo
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- CN108148942A CN108148942A CN201711182613.1A CN201711182613A CN108148942A CN 108148942 A CN108148942 A CN 108148942A CN 201711182613 A CN201711182613 A CN 201711182613A CN 108148942 A CN108148942 A CN 108148942A
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- slag
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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
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
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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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Abstract
Slag gasification dephosphorization method is stayed the present invention relates to a kind of converter slag and recycles smelting process, including：After converter smelting finishes and taps and slag tap, a part of clinker is retained in converter；According to FeO in clinker and P2O5Amount calculate and determine reducing agent dosage；1/2 reducing agent is added in before top blast nitrogen starts slag splashing；Slag splashing process whole process bottom blowing nitrogen, converter bottom use circular seam type bottom-blowing air feed element；Remaining 1/2 reducing agent is added in after drop rifle nitrogen flushing starts and is all added, and control rifle position in the residue adjustment stage, obtains the clinker after gasification dephosphorization；Then iron making adds steel scrap to carry out next stove smelting in converter, adds in new slag former in the process；Tapping steel is carried out after smelting, cycle smelting is carried out with this.The dephosphorization clinker that gasifies recycles, and can reduce lime input amount, improves the coolings material dosages such as ore, lime stone.Clinker slag system is stayed to be formed simultaneously, be beneficial to melt into hearthstone ash, save production cost.
Description
Technical field
The invention belongs to steel metallurgical technology field, what more particularly to a kind of converter finishing slag gasification dephosphorization treatment Posterior circle utilized
Method.
Background technology
China's steel industry is quickly grown in the past 20 years, has played national economy rapid growth important function, but saving
Solid waste discharges such as resource-saving, the energy and reduction clinker etc., are faced with huge pressure and challenge at present.In accounting for
It is annual to produce about 6.2 hundred million t crude steel for more than 90% oxygen converter steelmaking of state's steel output, 60,000,000 more than t clinkers are generated,
30,000,000 more than t lime and 7,000,000 more than t light dolomites are consumed, and are used to produce the stone of steel-making lime and light dolomite
Lime stone and unprocessed dolomite mineral products are important non-renewable resources.Application at present or the comprehensive utilization for exploring vessel slag
Or reduce there are many kinds of the methods discharged, two classes are roughly divided into, one kind is added again after clinker is solids from converter discharge
To handle and utilize, comparative maturity is recycling metallic iron, is later used to sintering mine additive, synthetic slag raw material, phosphate fertilizer or turns
Blast furnace cement, i.e., so-called " end treatment ", but it is relatively low to efficiently use value；Another kind is clinker in molten condition, Nai Zhi
It is just recycled in converter, i.e., so-called " watershed management ", this method is the developing direction of converter current slag, is met without useless
Or few metallurgical Ecological Industrial developing direction of giving up, comparative maturity have the smelting processes such as splashing slag in converter remaining slag operation.
The steel grades such as 20 th century laters, deep punching steel and high-grade pipe line steel require phosphorus content harsh, traditional single slag process refining
Steel dephosphorization rate is low, and dephosphorization effect is poor.The mid-90, Japanese major steel mill have carried out the experimental study of converter dephosphorization of molten iron,
And the rapid production problem promoted, solve ultra-low phosphoretic steel after successful.Duplex practice is to use two block converter integrations of operation,
One block converter dephosphorization, another block converter receive the low-phosphorous molten iron decarburization from dephosphorization stove, and typical duplex practice technological process is：It is high
Stove molten iron → molten iron pre-desulfurization → converter dephosphorization → converter decarburization → double refining → continuous casting.Japanese converter uses duplex practice dephosphorization
Process for making mainly have JFE Fushans iron LD-NRP methods, the SRP methods of Sumitomo Metal Industries, the H oven processes of Kobe Steel, new day
The LD-ORP methods of iron, China's Baosteel, Anshan iron and steel plant, Shoudu Iron and Steel Co Jing Tang companies etc. have also all selected duplex process steel making technique.
For converter duplex method dephosphorization when producing clean steel in enormous quantities, converter capacity is big, there is sufficient reaction compartment, and reaction is dynamic
Mechanical condition is superior, and phosphorus can be taken off to 0.010% hereinafter, creating condition for less-slag melting in molten iron；Converter duplex method is production
Ultra-low phosphoretic steel, pipe line steel and high-quality Wide and Thick Slab strand provide advantageous condition；Duplex practice advantage of lower cost, converter decarbonized slag
For the duplex practice of another block converter dephosphorization, the steel technology for producing 1t molten iron reduces 25kg, lime consumption than conventional method
Reduce 40%.But converter duplex method steel-making capital construction cost is higher, needs two block converter equipment of rational management, clinker and molten steel are mutually opposite
, it operates more complicated.
Room orchid iron institute of Nippon Steel (two 270t LD-OB converters) and a big point iron institute (3 370t combined blown converters) processed are set
Standby and product limitation, employs MURC technologies, and dephosphorization of molten iron pretreatment and decarburization blowing, similar tradition are carried out in same converter
The double slag process of steel-making.Converter smelting is divided into two stages in MURC technological operations, desiliconization, dephosphorization are substantially carried out in the 1st stage,
After pour out part clinker, then carry out the blowing of the 2nd stage, tapping but clinker be maintained in stove after finishing blowing, it is next
Stove stays slag to be packed into steel scrap, molten iron in stove, then carries out the blowing of the 1st and the 2nd stage, and move in circles with this.Room is blue
Iron institute processed and big point iron processed all use MURC techniques, and early period, dephosphorized slag generally poured out 50%, and decarbonized slag is directly stayed in stove
It blows for next stove dephosphorization, MURC techniques smelting cycle about 33~35min.Ogawa in 2001 etc. reports Nippon Steel's exploitation
MURC converter steel-smelting techniques and its test situation in 8t converters.In recent years, Nippon Steel reports MUCR technique phases successively
Concern feeling condition, big point of Nippon Steel Corp, Yawata, room be blue, Jun Jindeng steel mills employ the technique, the total steel output of Chan Gangzhan Nippon Steel
55% or so, converter steel melting lime consumption reduces more than 40%.
50~seventies of 20th century, some Chinese converter steel factories are when molten iron silicon, phosphorus mass fraction are high, in order to reduce lime
Consumption reduces converting process splash, improves dephosphorization effect, and slag or " staying slag+bis- slags " process for making are stayed after once using tapping.With
The increasingly raising (reduction of molten iron silicon mass fraction) of blast fumance level, high-phosphorus iron ore dosage reduce (molten iron phosphorus mass fraction
Reduce) and scruple slag is stayed to cause molten iron splash security risk, stay slag process for making without more large-scale promotion use.In recent years
Coming domestic many steel mills starts to use the patent of invention 201610012514.4 of remained converter slag process for making, Wang Xinhua etc. " a kind of
Reduce the converter steel making method of the quantity of slag " and 201110340294.9 " a kind of converter smelting process methods of low phosphorus steel by smelting ",
Key technology is the dephosphorization stage by using low alkalinity (w (CaO)/w (SiO2)：1.3~1.5) and low MgO mass fractions (≤
7.5%) slag system forms good fluidity and appropriate foamed clinker, solve " staying slag+bis- slags " process for making it is quick it is enough fall
Slag and this high two hang-up of metal in the dreg weight of iron score.The problem of weak is stirred for bottom-blowing of converter, in the dephosphorization stage using low
Rifle position and high-strength oxygen method strengthen metal bath stirring to promote dephosphorization, at the end of the dephosphorization stage using top blast oxygen stream
[P] is averagely reduced to 0.029% or so, and decarburizing phase terminal [P] is reduced to 0.0096% or so, meets most steel grades
Phosphorus mass fraction is controlled and is required.SGRS processes are formd through commerical test, Shoudu Iron and Steel Co is blown again in 5 210t of its Qian Gang company
3 100t combined blown converters of converter and Shou Qin companies using this method, achieve steel-making lime consumption and reduce more than 47%, gently on a large scale
Calcined dolomite consumption reduces more than 55%, and the quantity of slag reduces by more than 30% effect.The patent of invention of Cui Yang etc.
200910088141.2 propose " a kind of method of the top and bottom combined blown converter dephosphorization of molten iron under the conditions of slag splashing ", and patent passes through
Slag splashing operation efficiently uses the clinker of previous heat and protection furnace lining, while improves dephosphorization efficiency.These patented method institutes
Based on double slag process be required for the quick deslagging before mid-term is smelted, carry rifle interrupt oxygen blast operation, compared with common process, due to
It increases clinker curing and dephosphorization terminates time of deslagging, using double slags+stay the slag technique rear converter list stove production cycle than conventional
It smelts and extends about 4min, and in order to reduce slag beneficiation and cure clinker, added in slag splashing technique a variety of quenched
Slag material, such as lime, unprocessed dolomite, light dolomite, magnesium carbon ball.
The patent of invention 200910077085.2 of Li Jianxin etc. proposes " a kind of converter smelting process using Dephosphorising agent ",
Its technical solution is pointed out using good dynamic conditions such as low temperature early period and high oxidation ferrous irons, and using containing a small amount of CaCl2's
CaO bases Dephosphorising agent carries out dephosphorization, later stage slag making again, and decarbonized slag is used as the dephosphorized slag of lower stove.Recently, the hair of Zhao Dongwei etc.
Bright patent 201610166145.8 proposes " a kind of smelting process of converter high efficiency dephosphorating ", and patent is poured out after pointing out slag splashing
Before beginning is bessemerized, pre-melted slag, ingredient CaO are added in into stove for remaining clinker：70~85%, SiO2:15~30%,
It carries out bessemerizing operation.These patents optimize the clinker after slag splashing, but the problem is that fail fully to turning
Clinker is modified and gos deep into utilizing, and phosphorus enrichment problem limits a large amount of vessel slags recycling inside steel plant.
Late 1970s, her Japanese rattan is public to have studied Ca long2SiO4-Ca3(PO4)2And CaO-SiO2-Fe2O3Liquid phase
The balanced dispensed ratio of phosphorus between slag, the results showed that the phosphorus overwhelming majority in vessel slag is enriched in primary phase Ca2SiO4-Ca3(PO4)2In,
To be dissolved volume morphing presence, it is difficult to remove.The scholars such as Morita are using microwave carbon thermal reduction to CaO-SiO2The synthesis of-FetO systems
The recycling of Fe, P, Cr have carried out basic research in slag, dephosphorization of molten iron pretreatment slag and the stainless clinker of converter containing Cr, demonstrate this
The feasibility of method dephosphorization and the method for proposing P in further recycling reduzate.Using microwave heating carbon thermal reduction converter
Clinker carries out gasification dephosphorization, is an effective way for removing P elements in clinker.About cost-effectively removing Converter
The method of phosphorus in slag, the method especially with phosphorus in gasification removing slag in stove during slag splashing have many reports, king
A kind of " phosphorus in the removing slag that gasifies during splashing slag in converter of 200610012514.4 invention of patent of invention of book Huan etc.
Before slag splashing, appropriate Dephosphorising agent is added in into molten bath for method ", and during slag is splashed, high pressure nitrogen after oxygen rifle by generating
In-furnace slag is smashed into particles splatter and gets up to be hung on furnace lining by enormous impact force, this process is solid (coke)-gas (nitrogen)-liquid
The chemical reaction inside reaction and slag between (slag) provides good dynamic conditions, obtains the phosphorus in slag
To enter gas phase removal by chemical reaction, gasification Dephosphorising agent is divided to two kinds of carbonaceous Dephosphorising agent and siliceous Dephosphorising agent, and carbonaceous has more
Commercial Application realistic meaning, through laboratory infrastest for many years and iron and steel enterprise's commerical test, gasification dephosphorization rate reaches 40% water
It is flat, more than 80% slag rate is stayed, the ton steel stove quantity of slag 40~60kg/t of average out to achieves good effect.The patent of invention of Wang Hu
201510561089.3 inventions " a kind of method with coal gas of converter slag splashing operation ", the technique are replaced using coal gas of converter
Nitrogen carries out splashing slag in converter operation, and rapidly and efficiently gasify dephosphorization when realizing slag splashing operation, reduces steel-making cost.These
Patented method can effectively gasify dephosphorization, but remain in the processing of vessel slag, do not propose the effect smelted for lower stove and
It influences, does not form efficient circulation process for making.
Chinese invention patent application CN201710588339.1 proposes a kind of converter gasification dephosphorized slag cycle dephosphorization steel-making
Method, this application overcomes some problems mentioned in above-mentioned background technology to a certain extent, but this application is de- about gasification
The operating method provided in the operation of phosphorus is more rough, loses excessively or operate not easy to control etc. ask in practice there are Dephosphorising agent
Topic, still needs further to be improved.
Invention content
To solve the above problems, a kind of converter slag of present invention offer stays recycles smelting side under slag gasification dephosphorization pattern
Gasification dephosphorization operating procedure is further improved in method, this method so that easily-controlled operation reduces cost, and dephosphorization is imitated
Fruit is good.
One of specifically, to achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of converter slag stays slag gasification dephosphorization method, and described method includes following steps：
After converter smelting is finished and tapped, part clinker is poured out, a part of clinker is retained in converter；
According to FeO and P in remaining clinker2O5Amount calculate and determine reducing agent dosage；
The calculating that 1/2 is added in before top blast nitrogen starts slag splashing determines reducing agent dosage；
Slag splashing process whole process bottom blowing nitrogen, converter bottom uses circular seam type bottom-blowing air feed element, and controls nitrogen stream
Amount；
Residue 1/2, which calculates, determines that reducing agent dosage is added in after drop rifle nitrogen flushing starts and all added in the residue adjustment stage, and
Rifle position is controlled, obtains the clinker after gasification dephosphorization；
Clinker after the gasification dephosphorization is retained in the smelting that next stove is used in converter.
Further, the amount for retaining a part of clinker is the 1/2-2/3 whole quantity of slag.
Further, reducing agent therein is coke blacking.
Further, the coke fines size is required between 8mm~10mm, is not more than 5% less than 8mm coke fines sizes.
Further, coke powder addition is obtained by reduction balanced reaction, with P in Restore All slag205With FeO needed for carbon amounts
1.2 times of amount determines reducing agent dosage to calculate, and specific formula for calculation is：
Wherein：W(c)：Coke addition, kg；W (slag)：Slag weight, kg；W(P2O5)：P2O5Percentage composition, %；W
(FeO)：FeO percentage compositions, %；1.2：For carbon equivalent multiple.
Further, it is bottom-blowing air feed element by stainless-steel seamless pipe group that converter bottom, which uses circular seam type bottom-blowing air feed element,
Into；The injection original paper is arranged on furnace bottom 0.4~0.5D radius concentric circles, and 38 ° or so angles are wired to trunnion.
Further, the control rifle position for residue adjustment rifle position controls and splashes slag rifle position to control two benches；The control of residue adjustment rifle position is high
In blowing rifle position substantially；Slag rifle position is splashed less than the basic rifle position of smelting.
To achieve the above object two, the technical solution adopted by the present invention is as follows：
A kind of converter slag stays and recycles smelting process under slag gasification dephosphorization pattern, and described method includes following steps；
After the completion of upper stove converter slag stays slag and the according to the method described above operation of gasification dephosphorization method, the iron making in converter
Add steel scrap；
It is smelted, adds in new slag former in the process, the new slag former according to demand and considers that previous stove stays slag
It measures to determine；
Thermometric and sampling are carried out after smelting, tapping steel is carried out after qualified；
Part slag is poured out after tapping, carries out the operation of gasification dephosphorization according to the method described above so as to fulfill smelting is recycled
Refining.
Further, the new slag former includes lime, dolomite, ore and iron sheet ball, and adds in batches, smelts just
Phase, head batch enter hearthstone ash quantity for the total lime consumptions of 1/2-2/3 and light dolomite, ore and iron sheet ball, smelt mid-term, add in
Second batch slag material, lime consumption are the total lime consumptions of 1/3-1/2.
Without clinker special disposal equipment, good dynamics condition when borrowing slag splashing adds in also the present invention into stove
Former agent reduced blast furnace, the dephosphorization product after reduction are finally overflowed with furnace gas in stove with phosphorus vapor form, and industrial production is easier to realize.
Clinker is recycling in next stove and smelts after gasification dephosphorization, can fundamentally realize cycle of the slag in enterprises, reduces waste
Discharge capacity is the important measures for realizing energy-saving and emission-reduction.
The driven terms of mechanics of the present invention is started with, and is changed reducing agent and is splashed whole disposable feed postitions before slag.Coke powder used exists
About 1/2 total addition is added in before top blast nitrogen, remainder is added in after drop rifle nitrogen flushing starts and all added in the residue adjustment stage.
Coke powder and clinker response area are increased by such charging process, strengthen gasification dephosphorization effect.
Coke fines size used in the present invention is required between 8mm~10mm, less than 8mm coke fines sizes no more than 5%, compared with granule
Degree is easy to increase coke powder and clinker response area, while it is interior that undersized is avoided to be come out of the stove by furnace gas band.Thermodynamics is proved splashing
P is restored using coke powder under slag furnace retaining atmosphere205It is feasible, and first restored better than FeO under a large amount of cycle furnace gases.Coke powder addition is by also
Former balanced reaction obtains, with P in Restore All slag205With FeO needed for carbon amounts be one times of carbon equivalent.Experiment proves that practical coke adds
Enter amount in about 1.2 times of carbon equivalents, can obtain higher gasification dephosphorization rate.Coke powder more than needed can be used as lower stove to smelt heat generating agent on a small quantity,
The smelting of lower stove is not impacted.
The present invention optimizes control to rifle position after slag splashing stage rifle position and lower stove remaining slag operation.Slag splashing process
Middle rifle position control is divided into the control of residue adjustment rifle position and splashes slag rifle position control two benches.Slag splashing early period, (FeO) content is high in slag,
Slag fluidity is good, and early period adds in coke powder, and clinker should be provided by playing a dual role of gasification dephosphorization and residue adjustment, reasonable residue adjustment rifle position
Kinetic energy needed for being mixed with coke powder, but need to avoid clinker splash caused by clinker, coke powder mixing it is uneven, residue adjustment rifle position is basic to be higher than
Blowing rifle position is advisable, and practical control is controlled according to clinker physical property and quantity of slag flexible in size.In the residue adjustment stage, slag fluidity is good, passes
Matter is fast, is the critical period of gasification dephosphorization.It splashes slag rifle position and splashes enough kinetic energy needed for slag, but rifle less than basic rifle position, guarantee is smelted
Position can not be too low, avoids that kinetic energy is consumed in inside clinker and furnace bottom washes away, and splashes slag rifle position by observing fire door flame and slag particle
Take-off situation flexibly controls.
It is using aforesaid operations mode advantage and benefit：Metallurgical slag is followed under the premise of no increase equipment investment
Ring utilizes, and is a kind of environmental protection, efficient slag treatment mode.The dephosphorization clinker that gasifies recycles, and can reduce lime input amount, carry
The coolings material dosage such as high ore, lime stone saves production cost.Clinker slag system is stayed to be formed simultaneously, be beneficial into hearthstone
Ash melts, beneficial to converter dephosphorization.
Description of the drawings
By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this field
Technical staff will become clear.Attached drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings：
Fig. 1 is the process flow diagram of converter smelting of the present invention；
Fig. 2 is converter bottom injection original paper arrangement figure of the present invention；
Fig. 3 is 65 tons of remained converter slag slag splashing rifle position schematic diagrames of certain enterprise in specific embodiment；
Fig. 4 is that specific embodiment enterprise is based on staying converter smelting rifle position process control chart under slag pattern.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although this public affairs is shown in attached drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure without the reality that should be illustrated here
The mode of applying is limited.It is to be able to be best understood from the disclosure, and can be by this public affairs on the contrary, providing these embodiments
The range opened completely is communicated to those skilled in the art.
By taking 65 tons of converter list slags of certain enterprise stay slag method to operate as an example, smelting operation process system is as follows：1st, the enterprise
65 tons of converter steelmaking processes of industry are as shown in Figure 1.When smelting finishes catch carbon, by controlling grate angle is constant to stay the quantity of slag on 4 tons of left sides
The right side avoids heat under the influence of staying the quantity of slag excessive from smelting, while the quantity of slag is stablized to smelt control.After tapping, positive furnace body is shaken,
1/2 total amount coke powder is added in by high hopper before slag splashing, drop rifle nitrogen flushing enters slag splashing pattern, opens and blow while add in residue
Coke powder, and whole coke powders are added in the blowing residue adjustment stage, enterprise's residue adjustment time control is in 20-50s, and residue adjustment rifle position is according to the quantity of slag
And the different flexibly controls of (FeO) content in slag.Whole bottom blowing operating under nitrogen during slag splashing, as shown in Fig. 2, converter bottom is adopted
It is that bottom-blowing air feed element is made of stainless-steel seamless pipe with circular seam type bottom-blowing air feed element；The injection original paper is arranged on furnace bottom
On 0.4~0.5D radius concentric circles, 38 ° or so angles are wired to trunnion.Nitrogen flow is controlled in 350Nm3/h.Enterprise's smelting
Refine finishing slag P2O5Content is controlled between 2.5-3.2%, and finishing slag FeO contents are controlled between 15-25%, and coke powder addition is with complete
FeO and P in portion's reducing slag2O5Carbon equivalent on the basis of required coke powder amount, the amount of being actually added into are advisable with 1.2 times of carbon equivalents, and coke powder adds in
It measures shown in calculation formula such as formula (1), coke powder amount needed for heterogeneity ton slag is as shown in table 1.
Wherein：W(c)：Coke addition, kg；W (slag)：Slag weight, kg；W(P2O5)：P2O5Percentage composition, %；W
(FeO)：FeO percentage compositions, %；1.2：For carbon equivalent multiple.
Ton slag carbon dust addition under the different slag compositions of table 1
2nd, enterprise's splashing slag in converter time control rifle position control during 1-3min, slag splashing is as shown in Figure 3.By
Fig. 3 it is found that slag splashing rifle position control in by slag (FeO) content be affected, when (FeO) content about 15% in slag, residue adjustment
Rifle position slightly above blows basic rifle position, while observes fire door slag particle liveness, treats slag particle rareness, and drop rifle is to properly splashing slag rifle position；
During clinker (FeO) content about 20%, residue adjustment rifle position is higher than basic rifle position 400mm or so progress of blowing, after fire door flame extinction
The blowing of basic rifle position is down to, while observes fire door slag particle liveness situation, rationally adjusts rifle to splashing slag rifle position；Clinker (FeO) content
When about 25%, residue adjustment rifle position constantly observes fire door situation, control top at this time higher than basic rifle position 800mm or so progress of blowing
Nitrogen flushing throughput guards against excessive slag, rifle is adjusted to blow to higher than basic rifle position 400mm or so after fire door flame extinction, fire door slag
Grain liveness rationally adjusts rifle to splashing slag rifle position after reducing.
3rd, clinker is all stayed in stove and is used as lower stove first slag after slag splashing.After remaining slag operation, because of pre-slag slag system
It has been formed that, conducive to dephosphorization early period, initial smelting period preferably uses low rifle position to smelt, and lime adds in time delay, and lime is multiple batches of
It adds in, maintains high phosphate capacity slag system；Smelting mid-term prevents from returning dry；Latter stage is smelted, controls the anti-rephosphorization of rifle, cooling agent dosage should not mistake
Greatly, splash is prevented.Remaining slag operation typical case's rifle position control model is as shown in Figure 4.
Embodiment 1-6
The concrete technology that certain enterprise's converter recycles smelting process in the case where converter slag gasifies dephosphorization pattern is as described below.
It is low-alloy HRB400, single heat molten iron charge weight molten iron charge weight 62-66t, steel scrap charge weight 8- to smelt steel grade
12t, lime adding amount 2.2-2.8t, dolomite addition 1.2-2.3t, amount of lime 0.5-1.5t, iron sheet ball dosage 0.3-
1.1t, oxygen blow duration about 15min, smelting process rifle position 1.2-2.7m, smelting endpoint carbon 0.02-0.11%, average 0.05%, smelting
Refine 1665 DEG C, finishing slag FeO content 15-25% of terminal mean temperature, average out to 19%, finishing slag P2O5Content 2.5-2.9%, it is average
2.75%, finishing slag basicity average 2.5.Slag hearth time coke powder amount is stayed to be averaged 145kg/ stoves, the quantity of slag is stayed to be averaged 4t, slag splashing rifle position
1.1-2.7m, clinker dephosphorization rate is between 36.12%~42.02%, average value 39%.Each specific technological parameter of embodiment
It is shown in Table 2.
The technological parameter of 2 embodiment 1-6 of table
| Embodiment | Upper heat | Lime/kg | Finishing slag FeO/% | Finishing slag P2O5/ % | Coke powder/kg |
| 1 | Stay slag | 2200 | 18.27 | 2.579 | 145 |
| 2 | Stay slag | 2360 | 20.61 | 2.766 | 140 |
| 3 | Stay slag | 2260 | 18.02 | 2.738 | 145 |
| 4 | Stay slag | 2340 | 15.45 | 2.631 | 150 |
| 5 | Do not stay slag | 2650 | 20.52 | 2.861 | 0 |
| 6 | Do not stay slag | 2680 | 18.54 | 2.911 | 0 |
As shown in Table 2, slag hearth time lime adding amount is stayed be averaged 2290kg/ stoves, the secondary lime of slag hearth is not stayed to be averaged addition
2665kg/ stoves, remaining slag operation ton steel save amount of lime about 5kg/t.Lot of experimental data confirms that remaining slag operation can save lime
300~500kg/ stoves, ton steel lime consumption reduce 3.5-6kg, convert into ton steel cost and save 2~3 yuan.Recycle rear iron and steel stock
1.05 hereinafter, relatively saving 3.5-5.5kg/t steel compared to clinker iron loss in the past, ton steel cost saves 4~9 yuan for consumption control；It is burnt
Powder consuming cost 1-2 members/t steel consider cost-effective 5-10 members.Meanwhile converter slag field of metallurgy recycles, and is one
Environmentally friendly, direct, the efficient slag treatment mode of kind.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (9)
1. a kind of converter slag stays slag gasification dephosphorization method, which is characterized in that described method includes following steps：
After converter smelting is finished and tapped, part clinker is poured out, a part of clinker is retained in converter；
According to FeO and P in remaining clinker2O5Amount calculate and determine reducing agent dosage；
The calculating that 1/2 is added in before top blast nitrogen starts slag splashing determines reducing agent dosage；
Slag splashing process whole process bottom blowing nitrogen, converter bottom is blown element using circular seam type bottom blowing, and controls nitrogen flow；
Residue 1/2, which calculates, determines that reducing agent dosage is added in after drop rifle nitrogen flushing starts and all added, and control in the residue adjustment stage
Rifle position obtains the clinker after gasification dephosphorization；
Clinker after the gasification dephosphorization is retained in the smelting that next stove is used in converter.
2. dephosphorization method as described in claim 1, which is characterized in that the amount for retaining a part of clinker is complete for 1/2-2/3
Portion's quantity of slag.
3. dephosphorization method as described in claim 1, which is characterized in that reducing agent therein is coke powder.
4. dephosphorization method as claimed in claim 2, which is characterized in that the coke fines size is required between 8mm~10mm, small
It is not more than 5% in 8mm coke fines sizes.
5. dephosphorization method as claimed in claim 3, which is characterized in that coke powder addition is obtained by reduction balanced reaction, with complete
P in portion's reducing slag205With FeO needed for 1.2 times of amount of carbon amounts determine reducing agent dosage to calculate, specific formula for calculation is：
Wherein：W(c)：Coke addition, kg；W (slag)：Slag weight, kg；W(P2O5)：P2O5Percentage composition, %；W(FeO)：FeO
Percentage composition, %；1.2：For carbon equivalent multiple.
6. dephosphorization method as described in claim 1, which is characterized in that converter bottom uses circular seam type bottom-blowing air feed element the bottom of as
Aeration element is made of stainless-steel seamless pipe；The injection element is arranged on furnace bottom 0.4~0.5D radius concentric circles, with
Trunnion is wired to 38 ° or so angles.
7. dephosphorization method as described in claim 1, which is characterized in that the control rifle position for residue adjustment rifle position controls and splash slag rifle
Position control two benches；The control of residue adjustment rifle position is higher than basic blowing rifle position；Slag rifle position is splashed less than the basic rifle position of smelting.
8. a kind of converter slag stays and recycles smelting process under slag gasification dephosphorization pattern, which is characterized in that the method includes
Following steps；
Slag is stayed in upper stove converter slag and is completed according to the gasification dephosphorization method operation of claim 1-7 any one the method
Afterwards, iron making adds steel scrap in converter；
It is smelted, adds in new slag former in the process, the new slag former according to demand and considers that previous stove stays the quantity of slag
It determines；
Thermometric and sampling are carried out after smelting, tapping steel is carried out after qualified；
Part slag is poured out after tapping, according to claim 1-7 any one the method carry out gasification dephosphorization operation so as to
Realization recycles smelting.
9. dephosphorization method as claimed in claim 8, which is characterized in that the new slag former includes lime, dolomite, ore
It with iron sheet ball, and adds in, smelts initial stage in batches, it is the total lime consumptions of 1/2-2/3 and light-burned white clouds that head batch, which enters hearthstone ash quantity,
Stone, ore.
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| CN108546797A (en) * | 2018-05-28 | 2018-09-18 | 河南科技大学 | A kind of bottom-blowing of converter method and converter |
| CN108754062A (en) * | 2018-07-04 | 2018-11-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of the interior gasification dephosphorization steel-making of converter steel slag hearth |
| CN109112250A (en) * | 2018-08-17 | 2019-01-01 | 华北理工大学 | A kind of interior dephosphorization and the circulation utilization method of gasifying of semisteel smelting converter finishing slag furnace |
| CN109321704A (en) * | 2018-10-30 | 2019-02-12 | 华北理工大学 | It is a kind of to reduce the smelting process for smelting finishing slag phosphorus content using slag splashing |
| CN109536670A (en) * | 2018-12-21 | 2019-03-29 | 首钢京唐钢铁联合有限责任公司 | A kind of hot method recycled of dephosphorized slag in complete three de- technique |
| CN110129492A (en) * | 2019-04-19 | 2019-08-16 | 首钢京唐钢铁联合有限责任公司 | A method of processing steel slag |
| CN110484686A (en) * | 2019-08-19 | 2019-11-22 | 华北理工大学 | A kind of converter Dephosphorization method and smelting process |
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| CN114277212A (en) * | 2020-12-23 | 2022-04-05 | 天津荣程联合钢铁集团有限公司 | Method for prolonging service life of converter |
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| CN108546797A (en) * | 2018-05-28 | 2018-09-18 | 河南科技大学 | A kind of bottom-blowing of converter method and converter |
| CN108754062A (en) * | 2018-07-04 | 2018-11-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of the interior gasification dephosphorization steel-making of converter steel slag hearth |
| CN109112250A (en) * | 2018-08-17 | 2019-01-01 | 华北理工大学 | A kind of interior dephosphorization and the circulation utilization method of gasifying of semisteel smelting converter finishing slag furnace |
| CN109321704A (en) * | 2018-10-30 | 2019-02-12 | 华北理工大学 | It is a kind of to reduce the smelting process for smelting finishing slag phosphorus content using slag splashing |
| CN109321704B (en) * | 2018-10-30 | 2021-02-26 | 华北理工大学 | Smelting method for reducing phosphorus content of smelting final slag by slag splashing furnace protection |
| CN109536670A (en) * | 2018-12-21 | 2019-03-29 | 首钢京唐钢铁联合有限责任公司 | A kind of hot method recycled of dephosphorized slag in complete three de- technique |
| CN110129492A (en) * | 2019-04-19 | 2019-08-16 | 首钢京唐钢铁联合有限责任公司 | A method of processing steel slag |
| CN110484686A (en) * | 2019-08-19 | 2019-11-22 | 华北理工大学 | A kind of converter Dephosphorization method and smelting process |
| CN111996314A (en) * | 2020-07-31 | 2020-11-27 | 鞍钢股份有限公司 | Method for extracting iron by using carbon reduction thermal state converter slag |
| CN114277212A (en) * | 2020-12-23 | 2022-04-05 | 天津荣程联合钢铁集团有限公司 | Method for prolonging service life of converter |
| CN114941049A (en) * | 2022-05-26 | 2022-08-26 | 莱芜钢铁集团银山型钢有限公司 | Converter bottom control method |
| CN114941049B (en) * | 2022-05-26 | 2023-06-09 | 莱芜钢铁集团银山型钢有限公司 | Converter bottom control method |
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