CN107723412B - A kind of duplex smelting dephosphorization technology of high phosphorus hot metal - Google Patents
A kind of duplex smelting dephosphorization technology of high phosphorus hot metal Download PDFInfo
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- CN107723412B CN107723412B CN201710907621.1A CN201710907621A CN107723412B CN 107723412 B CN107723412 B CN 107723412B CN 201710907621 A CN201710907621 A CN 201710907621A CN 107723412 B CN107723412 B CN 107723412B
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- dephosphorization
- slag
- hot metal
- high phosphorus
- molten iron
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- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 58
- 239000011574 phosphorus Substances 0.000 title claims abstract description 58
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000002184 metal Substances 0.000 title claims abstract description 30
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 30
- 238000005516 engineering process Methods 0.000 title claims abstract description 22
- 238000003723 Smelting Methods 0.000 title claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 132
- 239000002893 slag Substances 0.000 claims abstract description 96
- 229910052742 iron Inorganic materials 0.000 claims abstract description 66
- 239000000463 material Substances 0.000 claims abstract description 52
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000009491 slugging Methods 0.000 claims abstract description 26
- 238000007664 blowing Methods 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 18
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 239000011261 inert gas Substances 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 21
- 239000010436 fluorite Substances 0.000 claims description 14
- 241001417490 Sillaginidae Species 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 239000012159 carrier gas Substances 0.000 claims description 8
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052593 corundum Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 239000004615 ingredient Substances 0.000 claims description 8
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 8
- 235000019738 Limestone Nutrition 0.000 claims description 7
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 7
- 239000006028 limestone Substances 0.000 claims description 7
- 238000010891 electric arc Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 10
- 238000009628 steelmaking Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 241001062472 Stokellia anisodon Species 0.000 abstract description 3
- 230000000087 stabilizing effect Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000002844 melting Methods 0.000 description 10
- 230000008018 melting Effects 0.000 description 10
- 238000010410 dusting Methods 0.000 description 9
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 7
- 235000011941 Tilia x europaea Nutrition 0.000 description 7
- 239000004571 lime Substances 0.000 description 7
- 229910001570 bauxite Inorganic materials 0.000 description 6
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 239000012141 concentrate Substances 0.000 description 5
- 239000000428 dust Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical compound [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 229910002974 CaO–SiO2 Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000002550 fecal effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- 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
- C21C5/30—Regulating or controlling the blowing
- C21C5/34—Blowing through the bath
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of duplexs of high phosphorus hot metal to smelt dephosphorization technology comprising pre- dephosphorization and converter smelting process, the pre- dephosphorization process are as follows: carries out pre- dephosphorization using pre- dephosphorization furnace；Desiliconization slag material is added in high phosphorus hot metal, injecting oxygen carries out desiliconization slugging；Dephosphorization slag material is put into after desiliconization slugging, solid oxygen agent, while injection dephosphorization agent is put into after dephosphorization slugging, and bottom blowing inert gas is to strengthen stirring；Molten iron after pre- dephosphorization enters converter smelting process after slag iron separation equipment.This dephosphorization technology has the advantages that some column such as process stabilizing, temperature are low, processing capacity is big, thoroughly solves the problems, such as high phosphorus, super high phosphorus hot metal dephosphorization.The present invention is suitable for high phosphorus hot metal, super high phosphorus hot metal, and the dephosphorization rate of pre- dephosphorization can reach 64~71%.This technique is smelted using the pre- dephosphorization furnace of molten iron and converter duplex, is able to achieve high phosphorus, the operation of superelevation phosphorus molten iron smelting, is significantly reduced pneumatic steelmaking burden, keep steel-making more efficient, ensure that the smooth and stability of production procedure.
Description
Technical field
The present invention relates to a kind of dephosphorization method for molten iron, the duplex of especially a kind of high phosphorus hot metal smelts dephosphorization technology.
Background technique
Phosphorus is in steel with [Fe2P] form presence, it can also be indicated with [P].Although phosphorus can improve the intensity of steel, with
Phosphorus content increases, and the plasticity and toughness of steel reduce (the especially reduction of low-temperature impact toughness), even if the brittleness of steel increases, usually
Referred to as " cold brittleness ".As C, N, O content increase, this illeffects aggravation of phosphorus, therefore become and mainly remove member in steel
One of element.
Current dephosphorization mode common in the industrial production is main are as follows: in ladle, torpedo tank car powder dephosphorization, converter is de-
Phosphorus and electric furnace dephosphorization.Ladle, torpedo tank car powder dephosphorization technique its main feature is that: pretreatment unit using molten iron accept haulagman
Slag making materials are spurted into hot metal interior or surface by dusting device or chute in specific station, and grasped with top blowing oxygen by tool
Make, to improve Threshing injury, compensation temperature loss.Ladle, torpedo tank car powder dephosphorization technique pretreatment time are long, process
Journey temperature drop is big, and temperature is low after processing；It is limited by ladle heat size ratio, when requiring molten iron phosphorus less than 0.15%, not only molten iron
The amount of being packaged into is only the 50%~60% of normal charge weight, and processing capacity declines to a great extent, and pulvis consumption increases, dephosphorization effect
Fruit fluctuation is big, can not handle high phosphorus hot metal.
Converter dephosphorization pretreating process its main feature is that: pretreatment unit is converter, and molten iron is blended into a seat tool and has blows ability again
Furnace in, be added a certain amount of steel scrap and sludging flux, carry out desiliconization, dephosphorizing pretreatment.Converter dephosphorization technique uses blocky stone
Ash, ore, molten iron phosphorus is generally required less than 0.15%, under the conditions of molten iron pretreatment temperature, lime, ore slag making mode clinker
Basicity is low, and [P] energy stability contorting can not handle high phosphorus hot metal 0.020~0.040% after handling low-phosphorous molten iron.
Traditional electric furnace dephosphorization at present, there are slag making dephosphorizing process there are slugging speed is slower, and stirring intensity of molten pool is insufficient,
Mass transfer and the problems such as slow dephosphorisation reaction speed between slag steel, the quantity of slag is big, and decarburized amount is larger, and dephosphorization effect is poor, it is difficult to which satisfaction was smelted
The requirement of journey high efficiency dephosphorating.
In recent years, with the rapid development of steel industry, low phosphor iron ore is on the verge of exhaustion, high-phosphorus iron ore in world wide
Exploitation and smelt gradually brought into schedule, blast furnace causes molten iron phosphorus content higher using high rock phosphate in powder, traditional smelting mode
Production needs are not able to satisfy, easily causes part molten steel phosphorus high, brings serious influence to steel quality and cost.How to be promoted low
The application percentage of valence high phosphorus mineral rationally controls phosphorus element content in steel, reduces cost of material and production overall cost, becomes smelting
The important topic of metal working author.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of duplexs of the good high phosphorus hot metal of desulfurization effect to smelt dephosphorization work
Skill.
In order to solve the above technical problems, the technical solution used in the present invention is: it includes pre- dephosphorization and converter smelting work
Sequence, the pre- dephosphorization process are as follows: pre- dephosphorization is carried out using pre- dephosphorization furnace；Desiliconization slag material is added in high phosphorus hot metal, is blown oxygen
Gas carries out desiliconization slugging；Dephosphorization slag material is put into after desiliconization slugging, and solid oxygen agent, while injection dephosphorization agent are put into after dephosphorization slugging,
And bottom blowing inert gas is to strengthen stirring；Molten iron after pre- dephosphorization enters converter smelting process after slag iron separation equipment.
The pre- dephosphorization furnace of molten iron of the present invention is electric arc furnaces.
Dephosphorization slag material of the present invention is CaO-SiO2- FeO ternary slag material.The weight of the dephosphorization slag material ingredient
Content are as follows: CaO 40~45%, SiO218~22%, FeO 15~20%, Al2O35~10%, CaF 4~7%, Na2O 3
~5%.
It is 1.0~1.1 that first slag basicity is controlled when desiliconization slugging of the present invention, when dephosphorization slugging the control of finishing slag basicity be
1.85~2.0.
In pre- dephosphorization process of the present invention, molten iron temperature is controlled at 1350~1400 DEG C.
Injection dephosphorization agent of the present invention does carrier gas using compressed air, and the control of blowing time was at 10~15 minutes, blowing
2~3.5kg/tmin of intensity.
The flow of bottom blowing inert gas of the present invention is 0~0.2m3/ tmin, time are 5~10 minutes.
The beneficial effects of adopting the technical scheme are that dephosphorization technology of the invention has process stabilizing, temperature
Some column advantages such as low, processing capacity is big are spent, thoroughly solve the problems, such as high phosphorus, super high phosphorus hot metal dephosphorization.The present invention is suitable for molten iron
The molten iron of high phosphorus 0.40~0.70%, molten iron superelevation phosphorus > 0.80%, the dephosphorization rate of pre- dephosphorization furnace can reach 64~71%.This hair
It is bright to be smelted using the pre- dephosphorization furnace of molten iron and converter duplex, it is able to achieve high phosphorus, the operation of superelevation phosphorus molten iron smelting, uses the pre- dephosphorization of molten iron
Furnace treated molten iron-steelmaking significantly reduces pneumatic steelmaking burden, keeps steel-making more efficient, ensure that the suitable of production procedure
Smooth and stability.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is process flow chart of the invention.
Fig. 2 is the structural schematic diagram of pre- dephosphorization furnace of the present invention.
In figure: 1- charging system, 2- oxygen rifle, 3- Dephosphorising agent spray gun, 4- high phosphorus hot metal, 5- refractory material, the bottom 6-
Blow system, 7- slag iron separation equipment, 8- ladle.
Specific embodiment
Shown in Fig. 1, the duplex of this high phosphorus hot metal smelts dephosphorization technology and carries out duplex practice by pre- dephosphorization furnace and converter combination
Dephosphorization；Main desiliconization, pre- dephosphorization task are first completed in pre- dephosphorization furnace first with Dephosphorising agent；According to molten iron initial phosphorous content,
Series connection dephosphorization can be carried out using multiple pre- dephosphorization furnaces；Normal dephosphorization of smelting finally is carried out in converter to operate.
Shown in Fig. 2, the duplex of this high phosphorus hot metal smelts the pre- dephosphorization furnace that dephosphorization technology uses following structures: the pre- dephosphorization
Furnace is to be transformed to electric arc furnaces, includes furnace body and bell, the furnace body and bell adopt the type of being water-cooled, and furnace body has
Concurrent heating function；Upper of furnace body is equipped with charging system 1, the oxygen rifle 2 and Dephosphorising agent spray gun 3 protruded into furnace is equipped with across bell, in furnace
The bottom of body is equipped with bottom blowing system 6；Furnace body is equipped with the tapping mouth of a river, and high phosphorus hot metal 4 is by the tapping mouth of a river through slag iron separation equipment 7
Enter ladle 8 afterwards.The bottom of the furnace body inner cavity is equipped with refractory material 5.When carrying out pre- dephosphorization, first high phosphorus hot metal 4 is blended into
Pre- dephosphorization furnace calculates slag material and Dephosphorising agent pulvis according to phosphorus content in initial weight of molten iron and initial molten iron.It is by charging
System 1 puts into slag material in pre- dephosphorization furnace, and lifting oxygen rifle 2 carries out desiliconization slugging to molten iron.A large amount of slag formers add in order to prevent
Enter and cause temperature fluctuation big, charging is by the way of continuous investment or batch charging.After last slag material slugging, investment oxidation
Iron sheet etc. consolidates oxygen agent, while carrying out injection dephosphorization agent with Dephosphorising agent spray gun 3, and then 6 bottom blowing inert gas of bottom blowing system is to strengthen
Stirring.Molten iron pours into qualified molten iron in ladle 8 by slag iron separation equipment 7 after dephosphorization, provides qualification for converter smelting
Molten iron.
It includes pre- dephosphorization and converter smelting process that the duplex of this high phosphorus hot metal, which smelts dephosphorization technology, from dephosphorization thermodynamics and is moved
Mechanical condition is set about, and determines that the key control point of pre- dephosphorization process is as follows:
1, slag control: by CaO-SiO2The research of-FeO ternary phase diagrams, establishes reasonable dephosphorized slag slag system, according to molten iron
The conditions such as amount and initial molten iron phosphorus content, silicone content, calculate slag material (lime block, red bauxite, fluorite etc.) by prototype software
With Dephosphorising agent (pulverized limestone-Iron Ore Powder-Fluorspar Powder) additional amount of blowing.The dephosphorization slag material ingredient: 40~45wt% of CaO,
SiO218~22wt%, FeO 15~20wt%, Al2O35~10wt%, CaF 4~7wt%, Na23~5wt% of O.
2, system is added in clinker: slag material includes desiliconization slag material and dephosphorization slag material, in two batches secondary addition；Shown in Fig. 1,
First is the addition desiliconization slag material in the pre- dephosphorization furnace of molten iron, and injecting oxygen carries out desiliconization slugging, and desiliconization slag material is using normal
The slag material of rule；Second batch is that above-mentioned dephosphorization slag material is added after desiliconization, carries out dephosphorization slugging；After slag material slugging, add
Enter solid oxygen agent simultaneously with Dephosphorising agents such as spray gun blowing pulverized limestone, Fluorspar Powder and mineral powders.
3, basicity controls: basicity of slag control finishing slag basicity control at 1.0~1.1, dephosphorization slugging exists when desiliconization slugging
1.85~2.0.
4, temperature controls: in order to guarantee to obtain stable 3CaO P2O5, and ensure dephosphorization efficiency, pass through the pre- dephosphorization furnace of molten iron
Concurrent heating processing, temperature are controlled at 1350~1400 DEG C.
5, molten steel decarburization is serious in order to prevent, and dephosphorization agent of dusting using compressed air does carrier gas, and the control of blowing time is 10
~15 minutes, it is blown 2~3.5kg/tmin of intensity.
6, bottom blowing stirring: the pre- dephosphorization furnace bottom nitrogen-blow of molten iron or argon gas (depending on steel grade), using soft blow mode, bottom
Flow control is blown in 0~0.2m3/ tmin, 5~10 minutes performance dephosphorization dynamic conditions of agitation molten pool.
7, the molten iron after the pre- dephosphorization of the molten iron is handled using fecal iron separator, can shorten the stream slag of the pre- dephosphorization furnace of molten iron
And slag-removing time.
Embodiment 1: the duplex of this high phosphorus hot metal smelts dephosphorization technology and uses following concrete technologies.
It is tested in 2t electric furnace: by the way that iron ore, ferrorphosphorus and Antaciron is added, phosphorus being configured to 0.73%
Carry out simulation the pre- dephosphorization of molten iron, using lime block, red bauxite, concentrate powder, fluorite particle and Fluorspar Powder, pulverized limestone as raw material into
The pre- dephosphorization operation of row.It is separately added into desiliconization slag material after furnace melting molten iron and dephosphorization slag material slag material carries out slag making, control
For molten iron temperature processed at 1350~1400 DEG C, first basicity of slag is 1.0, and the control of finishing slag basicity is 1.9；The weight of dephosphorization slag material ingredient
Content are as follows: CaO 45%, SiO220%, FeO 18%, Al2O38%, CaF 5%, Na2O 4%.To dephosphorization slag material slugging
Solid oxygen agent is added afterwards carries out injection dephosphorization with spray gun simultaneously and dust agent operation, carrier gas is compressed air, is blown the time 12 minutes, is sprayed
2.5~2.7kg/tmin of powder intensity；Bottom blowing 0.1m is used after dusting3/ tmin nitrogen carries out melting bath stirring 9 minutes, and stream slag is taken off
Slag tapping, phosphorus content is 0.21% after processing, and dephosphorization rate reaches 71.2%.
Embodiment 2: the duplex of this high phosphorus hot metal smelts dephosphorization technology and uses following concrete technologies.
It is tested in 2t electric furnace: by the way that iron ore, ferrorphosphorus and Antaciron is added, phosphorus being configured to 0.95%
Carry out simulation the pre- dephosphorization of molten iron, using lime block, red bauxite, concentrate powder, fluorite particle and Fluorspar Powder, pulverized limestone as raw material into
The pre- dephosphorization operation of row.It is separately added into desiliconization slag material after furnace melting molten iron and dephosphorization slag material slag material carries out slag making, control
For molten iron temperature processed at 1350~1400 DEG C, first basicity of slag is 1.1, and the control of finishing slag basicity is 2.0；The weight of dephosphorization slag material ingredient
Content are as follows: CaO 42%, SiO222%, FeO 20%, Al2O35%, CaF 6%, Na2O 5%.To dephosphorization slag material slugging
Solid oxygen agent is added afterwards carries out injection dephosphorization with spray gun simultaneously and dust agent operation, carrier gas is compressed air, is blown the time 15 minutes, is sprayed
Blow 3.2~3.5kg/tmin of intensity；Bottom blowing 0.14m is used after dusting3/ tmin nitrogen carries out melting bath stirring 8 minutes；Stream slag is taken off
Slag tapping, phosphorus content is 0.34% after processing, and dephosphorization rate reaches 64.2%.
Embodiment 3: the duplex of this high phosphorus hot metal smelts dephosphorization technology and uses following concrete technologies.
It is tested in 2t electric furnace: by the way that iron ore, ferrorphosphorus and Antaciron is added, phosphorus being configured to 0.57%
Carry out simulation the pre- dephosphorization of molten iron, using lime block, red bauxite, concentrate powder, fluorite particle and Fluorspar Powder, pulverized limestone as raw material into
The pre- dephosphorization operation of row.It is separately added into desiliconization slag material after furnace melting molten iron and dephosphorization slag material slag material carries out slag making, control
For molten iron temperature processed at 1350~1400 DEG C, first basicity of slag is 1.05, and the control of finishing slag basicity is 2.0；The weight of dephosphorization slag material ingredient
Measure content are as follows: CaO 40%, SiO221%, FeO 19%, Al2O310%, CaF 7%, Na2O 3%.To dephosphorization slag material
Solid oxygen agent is added after slugging carries out injection dephosphorization with spray gun simultaneously and dust agent operation, carrier gas is compressed air, is blown the time 10 and divides
Clock, 2.2~2.5kg/tmin of intensity of dusting；Bottom blowing 0.15m is used after dusting3/ tmin nitrogen carries out melting bath stirring 10 minutes；
Stream slag is skimmed tapping, and phosphorus content is 0.18% after processing, and dephosphorization rate reaches 67.2%.
Embodiment 4: the duplex of this high phosphorus hot metal smelts dephosphorization technology and uses following concrete technologies.
It is tested in 2t electric furnace: by the way that iron ore, ferrorphosphorus and Antaciron is added, phosphorus being configured to 1.06%
Carry out simulation the pre- dephosphorization of molten iron, using lime block, red bauxite, concentrate powder, fluorite particle and Fluorspar Powder, pulverized limestone as raw material into
The pre- dephosphorization operation of row.It is separately added into desiliconization slag material after furnace melting molten iron and dephosphorization slag material slag material carries out slag making, control
For molten iron temperature processed at 1350~1400 DEG C, first basicity of slag is 1.05, and the control of finishing slag basicity is 1.85；The weight of dephosphorization slag material ingredient
Measure content are as follows: CaO 45%, SiO218%, FeO 15%, Al2O310%, CaF 7%, Na2O 5%.To dephosphorization slag material
Solid oxygen agent is added after slugging carries out injection dephosphorization with spray gun simultaneously and dust agent operation, carrier gas is compressed air, is blown the time 15 and divides
Clock, 2.0~2.2kg/tmin of intensity of dusting；Bottom blowing 0.05m is used after dusting3/ tmin nitrogen carries out melting bath stirring 8 minutes；
Stream slag is skimmed tapping, and phosphorus content is 0.35% after processing, and dephosphorization rate reaches 67.0%.
Embodiment 5: the duplex of this high phosphorus hot metal smelts dephosphorization technology and uses following concrete technologies.
It is tested in 2t electric furnace: by the way that iron ore, ferrorphosphorus and Antaciron is added, phosphorus being configured to 0.74%
Carry out simulation the pre- dephosphorization of molten iron, using lime block, red bauxite, concentrate powder, fluorite particle and Fluorspar Powder, pulverized limestone as raw material into
The pre- dephosphorization operation of row.It is separately added into desiliconization slag material after furnace melting molten iron and dephosphorization slag material slag material carries out slag making, control
For molten iron temperature processed at 1350~1400 DEG C, first basicity of slag is 1.1, and the control of finishing slag basicity is 1.9；The weight of dephosphorization slag material ingredient
Content are as follows: CaO 43%, SiO221%, FeO 18%, Al2O39%, CaF 4%, Na2O 5%.To dephosphorization slag material slugging
Solid oxygen agent is added afterwards carries out injection dephosphorization with spray gun simultaneously and dust agent operation, carrier gas is compressed air, is blown the time 13 minutes, is sprayed
2.8~3.0kg/tmin of powder intensity；Bottom blowing 0.2m is used after dusting3/ tmin nitrogen carries out melting bath stirring 5 minutes；Stream slag is taken off
Slag tapping, phosphorus content is 0.27% after processing, and dephosphorization rate reaches 63.5%.
Claims (3)
1. a kind of duplex of high phosphorus hot metal smelts dephosphorization technology comprising pre- dephosphorization and converter smelting process, which is characterized in that institute
State pre- dephosphorization process are as follows: pre- dephosphorization is carried out using pre- dephosphorization furnace；Desiliconization slag material is added in high phosphorus hot metal, injecting oxygen carries out
Desiliconization slugging；Dephosphorization slag material is put into after desiliconization slugging, and solid oxygen agent, while injection dephosphorization agent, and bottom blowing are put into after dephosphorization slugging
Inert gas is to strengthen stirring；Molten iron after pre- dephosphorization enters converter smelting process after slag iron separation equipment；The molten iron
Pre- dephosphorization furnace is electric arc furnaces；The dephosphorization slag material is CaO-SiO2- FeO ternary slag material；It is controlled just when the desiliconization slugging
Basicity of slag is 1.0~1.1, and the control of finishing slag basicity is 1.85~2.0 when dephosphorization slugging；The Dephosphorising agent is pulverized limestone, Fluorspar Powder
And mineral powder；In the pre- dephosphorization process, molten iron temperature is controlled at 1350~1400 DEG C；
The weight content of the dephosphorization slag material ingredient are as follows: CaO 40~45%, SiO218~22%, FeO 15~20%,
Al2O35~10%, CaF24~7%, Na2O 3~5%；
Using the pre- dephosphorization furnace of following structures: including furnace body and bell, the furnace body and bell adopt the type of being water-cooled, furnace body band
There is concurrent heating function；Upper of furnace body is equipped with charging system (1), and oxygen rifle (2) and the Dephosphorising agent spray gun protruded into furnace is equipped with across bell
(3), bottom blowing system (6) are equipped in the bottom of furnace body；Furnace body is equipped with the tapping mouth of a river, and high phosphorus hot metal (4) can pass through the tapping mouth of a river
Enter ladle (8) through slag iron separation equipment (7).
2. a kind of duplex of high phosphorus hot metal according to claim 1 smelts dephosphorization technology, it is characterised in that: the blowing is de-
Phosphorus agent does carrier gas using compressed air, and the control of blowing time was blown 2~3.5kg/tmin of intensity at 10~15 minutes.
3. a kind of duplex of high phosphorus hot metal according to claim 1 or 2 smelts dephosphorization technology, it is characterised in that: the bottom
The flow of blown inert gas is 0~0.2m3/ tmin, time are 5~10 minutes.
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| CN109161636B (en) * | 2018-09-30 | 2020-03-20 | 武钢集团昆明钢铁股份有限公司 | Preparation method for extracting carbon and protecting manganese by converter smelting high-manganese high-phosphorus iron water |
| CN109161635B (en) * | 2018-09-30 | 2020-04-10 | 武钢集团昆明钢铁股份有限公司 | Preparation method for extracting carbon and protecting manganese by converter smelting high-manganese high-sulfur high-phosphorus iron water |
| CN109468428B (en) * | 2018-12-17 | 2020-10-27 | 包头钢铁（集团）有限责任公司 | Method for controlling phosphorus content in high-strength and high-toughness heavy rail steel by converter |
| CN112501386B (en) * | 2019-09-16 | 2022-05-27 | 江苏集萃冶金技术研究院有限公司 | Molten iron 'three-removing' pretreatment furnace |
| WO2021176024A1 (en) | 2020-03-05 | 2021-09-10 | Saint-Gobain Centre De Recherches Et D'etudes Europeen | Dephosphorization slag |
| FR3107896B1 (en) | 2020-03-05 | 2024-03-01 | Saint Gobain Ct Recherches | Dephosphorization slag |
| TWI721844B (en) * | 2020-03-30 | 2021-03-11 | 國立中興大學 | Composition for slagging |
| CN112961962A (en) * | 2021-02-04 | 2021-06-15 | 东北大学 | Composite dephosphorizing agent for tapping after furnace, preparation method and application |
| CN113265505B (en) * | 2021-02-07 | 2022-06-21 | 首钢集团有限公司 | Smelting method of high-nitrogen steel |
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