CN107790649A - Method for directly and continuously casting molten iron into steel billet - Google Patents
Method for directly and continuously casting molten iron into steel billet Download PDFInfo
- Publication number
- CN107790649A CN107790649A CN201610785836.6A CN201610785836A CN107790649A CN 107790649 A CN107790649 A CN 107790649A CN 201610785836 A CN201610785836 A CN 201610785836A CN 107790649 A CN107790649 A CN 107790649A
- Authority
- CN
- China
- Prior art keywords
- molten iron
- iron
- steel
- molten
- oxygen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 68
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000005266 casting Methods 0.000 title claims abstract description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 25
- 239000001301 oxygen Substances 0.000 claims abstract description 25
- 239000002893 slag Substances 0.000 claims abstract description 22
- 238000010079 rubber tapping Methods 0.000 claims abstract description 19
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 12
- 230000023556 desulfurization Effects 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 10
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 10
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 10
- 150000001875 compounds Chemical class 0.000 claims description 10
- 239000010459 dolomite Substances 0.000 claims description 10
- 229910000514 dolomite Inorganic materials 0.000 claims description 10
- 239000010436 fluorite Substances 0.000 claims description 10
- 239000004571 lime Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 238000005275 alloying Methods 0.000 claims description 5
- 239000005864 Sulphur Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000003723 Smelting Methods 0.000 abstract description 4
- 238000009628 steelmaking Methods 0.000 abstract description 4
- 238000010924 continuous production Methods 0.000 abstract description 3
- 238000007664 blowing Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- 230000003009 desulfurizing effect Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
-
- 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
-
- 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
-
- 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
- C21C7/072—Treatment with gases
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a method for directly and continuously casting molten iron into a steel billet, which comprises the following process flows of: tapping a blast furnace, performing desulfurization pretreatment on molten iron in a channel, removing slag for the first time, sealing an oxygen lance of the iron channel, blowing oxygen, adding a dephosphorizing and slagging material, removing slag for the second time, constructing a steel structure, pouring into a tundish and crystallizing; the invention integrates all the procedures of steel making by adopting a continuous production mode, realizes the rapid treatment of molten iron and the direct continuous casting of billets, saves the molten iron transportation process from a blast furnace to a converter and a series of supporting facilities required by converter smelting, greatly simplifies the procedures, saves the production time and cost and improves the production efficiency.
Description
Technical field
The present invention relates to steelmaking technical field, more particularly to a kind of molten iron without converter or electric furnace, be directly casting continuously to form steel billet
Method.
Background technology
Two big problems one of modern steel industrial development are production ultra-clean steels, second, significantly simplification of flowsheet, to
Specialization, serialization, automation and high speed direction are developed, and only make the whole production process from ore to steel billet continuous
Change, be only possible to the requirement for reaching high speed.
At present both at home and abroad also without the report of the blast-melted method for making steel that steel billet is directly casting continuously to form without converter or electric furnace
Road.
The content of the invention
It is using continuous production mode, steel-making is each the invention provides a kind of method that molten iron is directly casting continuously to form steel billet
Process is integrated, and is realized the quick processing of molten iron and is directly casting continuously to form base, saves blast furnace to Molten Iron Transportation process between converter,
And a series of auxiliary facilities needed for converter smelting, process has been simplified significantly, is saved production time and cost, is improved production
Efficiency.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of method that molten iron is directly casting continuously to form steel billet, technological process are：Desulfurizing iron is located in advance in blast furnace casting-ditch
Manage-once remove the gred-close iron runner oxygen gun blowing-addition dephosphorization slag material-secondary slagging-off-steel structure-tundish-crystallization
Device；Detailed process is as follows：
1) molten iron converges to an iron tap channel by a plurality of iron tap channel, ensures the continuity that molten iron taps a blast furnace；
2) molten iron is flowed in the first U-type groove, and the compound desulfurization of Ca-Mg is carried out using desulfuring spray gun in the first U-type groove；Pass through
Dreg discharging tunnel timing carries out deslagging to desulfurization slag；
3) molten iron after desulfurization is flowed into closed iron runner by the first tapping hole, and branched oxygen rifle pair is used in closed iron runner
Molten iron carries out oxygen blast, and oxygen blast oxygen pressure is determined according to molten iron depth, ensures that oxygen blast pool depth reaches more than the 1/2 of molten iron depth；
4) molten steel after aoxidizing enters in the second U-type groove by the second tapping hole, by 18~22Kg/ ton steel, passes through spray gun
Slag material is continuously blown in molten steel, slag material uses the powdered compound slag making of active lime+fluorite+light dolomite
Material, the weight ratio of each composition is active lime：Fluorite：Light dolomite=12~17：1：4~8；Timing is arranged clinker
Slag；
5) deoxidation alloying operation is carried out to molten steel at the tapping hole of the second U-type groove, meets the molten steel warp of component requirements
Steel linked up long nozzle and enters tundish；
6) Metal in Tundish immerses crystallizer progress continuous casting operation through submersed nozzle.
Compared with prior art, the beneficial effects of the invention are as follows：
1) continuous production mode is used, steel-making each operation is integrated, the quick processing of molten iron is realized and directly connects
Base is cast, has simplified process significantly, the production time is saved, improves production efficiency；
2) ton steel comprehensive energy consumption reduces, and refining efficiency, the thermal efficiency and recovery rate of iron improve；
3) raw material, semi-finished product, the handling repeatedly of finishing room and turnover process are eliminated, is related to handling, transport, equipment, factory
Area takes up an area, factory building and capital expenditure greatly reduce, reduce construction investment and production cost；
4) present invention has advanced and technological break-through, and the implementation of this method is the once change to process for making, tool
There is epoch-making meaning.
Brief description of the drawings
Fig. 1 is the process chart for the method that a kind of molten iron of the present invention is directly casting continuously to form steel billet.
In figure：1. 5. first tapping hole of iron tap channel 2. 3. first U-type groove of dreg discharging tunnel, 4. desulfuring spray gun, 6. closed iron runner
The long nozzle of the ditch 13. 7. tapping hole 12. of 8. second tapping hole of oxygen rifle, 9. 10. second U-type groove of slag former spray gun 11. is tapped
14. the crystallizer of 15. submersed nozzle of tundish 16.
Embodiment
The embodiment of the present invention is described further below in conjunction with the accompanying drawings：
As shown in figure 1, the method that a kind of molten iron of the present invention is directly casting continuously to form steel billet, technological process are：Blast furnace goes out
Iron-in ditch desulfurizing iron pre-process-once remove the gred-close iron runner oxygen gun blowing-addition dephosphorization slag material-secondary slagging-off-
Steel structure-tundish-crystallizer；Detailed process is as follows：
1) molten iron converges to an iron tap channel 1 by a plurality of iron tap channel, ensures the continuity that molten iron taps a blast furnace；
2) molten iron is flowed in the first U-type groove 3, and the compound desulfurization of Ca-Mg is carried out using desulfuring spray gun 4 in the first U-type groove 3；
Deslagging is carried out to desulfurization slag by the timing of dreg discharging tunnel 2；
3) molten iron after desulfurization is flowed into closed iron runner 6 by the first tapping hole 5, and branched oxygen is used in closed iron runner 6
Rifle 7 carries out oxygen blast to molten iron, and oxygen blast oxygen pressure is determined according to molten iron depth, ensures that oxygen blast pool depth reaches the 1/2 of molten iron depth
More than；
4) molten steel after aoxidizing enters in the second U-type groove 10 by the second tapping hole 8, by 18~22Kg/ ton steel, passes through spray
Slag material is continuously blown in molten steel by rifle 9, and slag material compound is made using the powdered of active lime+fluorite+light dolomite
Slag charge, the weight ratio of each composition is active lime：Fluorite：Light dolomite=12~17：1：4~8；Timing is arranged clinker
Slag；
5) deoxidation alloying operation is carried out to molten steel at the tapping hole 11 of the second U-type groove 10, meets the steel of component requirements
Water enters tundish 14 through steel ditch 12 by long nozzle 13；
6) molten steel of tundish 14 immerses the progress continuous casting operation of crystallizer 16 through submersed nozzle 15.
Following examples are implemented under premised on technical solution of the present invention, give detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
It is conventional method not mentionlet alone bright.
【Embodiment 1】Exemplified by smelting Q235B steel grades；
1) 1480 DEG C of molten iron temperature, in the first U-type groove 3, by the compound desulfurization of Ca-Mg by desulfurizing iron to sulfur content
0.010%；
2) desulfurized molten iron passes through closed iron runner 6, reaches 18% by FeO contents in the oxygen blast molten iron of oxygen rifle 7；
3) in the second U-type groove 10, the compound slag material of active lime+fluorite+light dolomite is blown by spray gun 9,
Each weight ratio of constituents is active lime：Fluorite：Light dolomite=15:1:6, tapping main chemical compositions be：Carbon 0.11%, phosphorus
0.015%, sulphur 0.009%, 1665 DEG C of tapping temperature；
4) Alloying Treatment is carried out to molten steel at tapping hole 11, the molten steel composition after processing is C:0.16%；Si:
0.080%；Mn:0.27%；P:0.014%；S:0.016%；1570 DEG C of temperature；
5) molten steel is flowed into progress continuous casting operation in tundish 14 by long nozzle 13 and obtains finished product steel billet, closed through examining
Lattice.
【Embodiment 2】Exemplified by smelting SPHC steel grades；
1) 1500 DEG C of molten iron temperature, in the first U-type groove 3, by the compound desulfurization of Ca-Mg by desulfurizing iron to sulfur content
0.005%；
2) desulfurized molten iron passes through closed iron runner 6, reaches 20% by FeO contents in the oxygen blast molten iron of oxygen rifle 7；
3) in the second U-type groove 10, the compound slag material of active lime+fluorite+light dolomite is blown by spray gun 9,
Each weight ratio of constituents is active lime：Fluorite：Light dolomite=it is 15:1:6, tapping main chemical compositions be：Carbon 0.05%,
Phosphorus 0.013%, sulphur 0.007%, 1670 DEG C of tapping temperature；
4) Alloying Treatment, the molten steel composition C after processing are carried out to molten steel at tapping hole 11:0.06%；Si:
0.007%：Mn:0.21%：P:0.013%：S:0.005%；1575 DEG C of temperature；
5) molten steel is flowed into progress continuous casting operation in tundish 14 by long nozzle 13 and obtains finished product steel billet, closed through examining
Lattice.
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 the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (1)
1. a kind of method that molten iron is directly casting continuously to form steel billet, it is characterised in that technological process is：Molten iron takes off in blast furnace casting-ditch
Sulphur pre-process-once remove the gred-closes iron runner oxygen gun blowing-addition dephosphorization slag material-secondary slagging-off-steel structure-tundish-
Crystallizer；Detailed process is as follows：
1) molten iron converges to an iron tap channel by a plurality of iron tap channel, ensures the continuity that molten iron taps a blast furnace；
2) molten iron is flowed in the first U-type groove, and the compound desulfurization of Ca-Mg is carried out using desulfuring spray gun in the first U-type groove；Pass through deslagging
Road timing carries out deslagging to desulfurization slag；
3) molten iron after desulfurization is flowed into closed iron runner by the first tapping hole, using branched oxygen rifle to molten iron in closed iron runner
Oxygen blast is carried out, oxygen blast oxygen pressure is determined according to molten iron depth, ensures that oxygen blast pool depth reaches more than the 1/2 of molten iron depth；
4) molten steel after aoxidizing enters in the second U-type groove by the second tapping hole, by 18~22Kg/ ton steel, will be made by spray gun
Slag charge is continuously blown into molten steel, and slag material uses the powdered compound slag material of active lime+fluorite+light dolomite, respectively
The weight ratio of composition is active lime：Fluorite：Light dolomite=12~17：1：4~8；Timing carries out deslagging to clinker；
5) deoxidation alloying operation is carried out to molten steel at the tapping hole of the second U-type groove, meets the molten steel of component requirements through steel ditch
Tundish is entered by long nozzle；
6) Metal in Tundish immerses crystallizer progress continuous casting operation through submersed nozzle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610785836.6A CN107790649B (en) | 2016-08-31 | 2016-08-31 | Method for directly and continuously casting molten iron into steel billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610785836.6A CN107790649B (en) | 2016-08-31 | 2016-08-31 | Method for directly and continuously casting molten iron into steel billet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107790649A true CN107790649A (en) | 2018-03-13 |
| CN107790649B CN107790649B (en) | 2019-06-25 |
Family
ID=61529493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610785836.6A Active CN107790649B (en) | 2016-08-31 | 2016-08-31 | Method for directly and continuously casting molten iron into steel billet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107790649B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500825A (en) * | 2020-06-04 | 2020-08-07 | 北京首钢股份有限公司 | Method for controlling titanium content behind steelmaking converter |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5739108A (en) * | 1980-08-20 | 1982-03-04 | Sumitomo Metal Ind Ltd | Preparation of pig iron for casting |
| JPS5848614A (en) * | 1981-09-16 | 1983-03-22 | Nippon Steel Corp | Dephosphorizing method for molten iron |
| CN2661699Y (en) * | 2003-07-22 | 2004-12-08 | 承德新新钒钛股份有限公司 | Continuous desulphurization equipment for blast furnace liquid iron |
| CN1590564A (en) * | 2003-08-27 | 2005-03-09 | 宝山钢铁股份有限公司 | Molten iron pretreatment method |
| CN101020941A (en) * | 2007-03-14 | 2007-08-22 | 张登山 | Molten iron pre-treating method and apparatus |
| CN102321783A (en) * | 2011-09-19 | 2012-01-18 | 武汉钢铁(集团)公司 | Steel-making method of experimental induction furnace |
-
2016
- 2016-08-31 CN CN201610785836.6A patent/CN107790649B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5739108A (en) * | 1980-08-20 | 1982-03-04 | Sumitomo Metal Ind Ltd | Preparation of pig iron for casting |
| JPS5848614A (en) * | 1981-09-16 | 1983-03-22 | Nippon Steel Corp | Dephosphorizing method for molten iron |
| CN2661699Y (en) * | 2003-07-22 | 2004-12-08 | 承德新新钒钛股份有限公司 | Continuous desulphurization equipment for blast furnace liquid iron |
| CN1590564A (en) * | 2003-08-27 | 2005-03-09 | 宝山钢铁股份有限公司 | Molten iron pretreatment method |
| CN101020941A (en) * | 2007-03-14 | 2007-08-22 | 张登山 | Molten iron pre-treating method and apparatus |
| CN102321783A (en) * | 2011-09-19 | 2012-01-18 | 武汉钢铁(集团)公司 | Steel-making method of experimental induction furnace |
Non-Patent Citations (2)
| Title |
|---|
| 沙永志等: "铁沟喷粉工艺及应用", 《钢铁研究学报》 * |
| 王玉彬等: "Ca-Mg系粉剂复合喷吹脱硫技术在鞍钢的应用", 《鞍钢技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111500825A (en) * | 2020-06-04 | 2020-08-07 | 北京首钢股份有限公司 | Method for controlling titanium content behind steelmaking converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107790649B (en) | 2019-06-25 |
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