CN109338041A - A kind of lime stone is applied to the method for LF refining instead of calcium carbide - Google Patents
A kind of lime stone is applied to the method for LF refining instead of calcium carbide Download PDFInfo
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- CN109338041A CN109338041A CN201811244163.9A CN201811244163A CN109338041A CN 109338041 A CN109338041 A CN 109338041A CN 201811244163 A CN201811244163 A CN 201811244163A CN 109338041 A CN109338041 A CN 109338041A
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- steel
- refining
- lime stone
- calcium carbide
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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
- 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
- C21C7/076—Use of slags or fluxes as treating agents
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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
- 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
- C21C7/06—Deoxidising, e.g. killing
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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
Abstract
The invention discloses a kind of lime stones to replace calcium carbide applied to the method for LF refining, the method is during LF refining, molten steel enters the station, and after ladle enters working position, connects and opens argon bottom-blowing, lime 3.0-5.0kg/t steel is added, lime stone 2.0-3.0kg/t steel, while according to the difference of steel grade, the ferrosilicon powder deoxidier of the aluminum shot of 0-0.7kg/t steel, the silicon calcium powder of 0-0.8kg/t steel, 0-1.0kg/t steel is added, argon flow is adjusted after stirring 3-5min, drops heated by electrodes later.Lime stone is thermally decomposed to generate CaO and CO2, wherein CaO enters in slag as slag material, CO2It is filled in steel slag, plays foaming effect, achieve the effect that arc-covering slag operation.By the present invention in that replacing expensive calcium carbide to carry out serving as foaming agent with cheap lime stone, expected submerged arc effect is reached, refining production cost is substantially reduced, and labor intensity of workers reduces.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of lime stone is applied to the method for LF refining instead of calcium carbide.
Background technique
In the production process of iron and steel enterprise, the unremitting pursuit that production cost is always enterprise is reduced.
The chemical reaction of steel-making occurs mainly in steel-slag interface.In LF furnace refining process, having made foamed slag can increase instead
The contact surface answered, to obvious the effects of improving steel quality, reduce molten steel [N] content, raising submerged arc effect.
Calcium carbide is common foaming agent in LF furnace refining process, and the main component of calcium carbide is CaC2.Calcium carbide is being transported and is being deposited
It during storage, is easy to react and decompose with the moisture content in air, has not only influenced its using effect but also generated toxic gas CO, together
When calcium carbide using packed, need operator to manually add to, increase the labor intensity of site operation personnel, increase and be produced into
This.
Lime stone can decompose generate CaO and CO at high temperature2, wherein CaO enters in slag as slag material, CO2It is filled in steel
Foaming effect can be played in slag, achievees the effect that submerged arc refining, while lime stone is cheap, submerged arc significant effect, and charging can
It is automatically added to by feed bin, labor intensity of workers reduces.
Therefore exploitation lime stone replaces the LF refining method of calcium carbide to have biggish economic benefit and social benefit.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of lime stones to replace calcium carbide applied to the method for LF refining.The hair
It is sensible to refine production cost to reduction molten steel LF furnace, refining effect is improved, the purpose of labor intensity of workers is reduced.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of lime stone is applied to instead of calcium carbide
The method of LF refining, the method are during LF refining, and molten steel enters the station, and after ladle enters working position, connects and opens bottom
Blowing argon gas, addition lime 3.0-5.0kg/t steel, lime stone 2.0-3.0kg/t steel, while according to the difference of steel grade, 0- is added
The aluminum shot of 0.7kg/t steel, the silicon calcium powder of 0-0.8kg/t steel, 0-1.0kg/t steel the deoxidiers such as ferrosilicon powder, after stirring 3-5min
Argon flow is adjusted, drops heated by electrodes later, lime stone is thermally decomposed to generate CaO and CO2, wherein CaO enters as slag material
In slag, CO2It is filled in steel slag, plays foaming effect, achieve the effect that submerged arc refining.
Molten steel inlet temperature of the present invention is 1500-1540 DEG C.
Connection of the present invention simultaneously opens argon bottom-blowing, and adjusting argon bottom-blowing flow is 100-300Nm3/h.
It is 50-100Nm3/h that argon flow is adjusted after stirring of the present invention.
Drop heated by electrodes of the present invention, first heating time 6-9min, liquid steel temperature 1510-1550 after heating
℃。
The method of the invention is suitable for smelting regular screw threads steel, cold pier steel.
The method of the invention takes refining slag specimen to examine after heating for the first time: CaO:30-50%, SiO2: 15-30%, MgO:5-
15%, Al2O3: 6-20%, FeO:1-2%, MnO:1-3%.
For the method for the invention during the entire process of first heating, the submerged arc effect poor time is preceding 50-80s.
Calcium carbide foam theory are as follows: CaC2+ 3 [ O ]=CaO+2CO
CaC2+ 3(FeO)=CaO+3Fe+2CO
The foam theory of lime stone are as follows: CaCO3=CaO+CO2
The beneficial effects of adopting the technical scheme are that the 1, present invention is by adopting in LF furnace ladle refining process
Calcium carbide is replaced with lime stone, lime stone is added early period in refining, lime stone decomposes at high temperature generates CaO and CO2, wherein CaO
Enter in slag as slag material, CO2It is filled in steel slag, plays foaming effect, achieve the effect that submerged arc refining.2, of the invention
It replaces calcium carbide to carry out submerged arc refining significant effect using cheap lime stone, reduces consumption of calcium carbide amount 0.5-0.8kg/t steel, production
Cost is about 0.76-1.14 yuan/ton of steel, compared with 1.2 yuan of the technical solution steel save the cost per ton or more using calcium carbide refining.
Specific embodiment
Present invention will be explained in further detail combined with specific embodiments below.
Based on 100t converter system straight carbon steel LF refining furnace, the refining process of foaming agent is served as instead of calcium carbide with lime stone.
1 lime stone of table is at being grouped as
2 calcium carbide of table is at being grouped as
Embodiment 1
A kind of lime stone of the present embodiment replaces LF furnace of the calcium carbide applied to the method for LF refining for cold-forging steel SWRCH22A to refine
Process, Metal Weight 109t, the liquid steel temperature that enters the station are 1540 DEG C, after ladle enters working position, connect and open argon bottom-blowing
It adjusts argon flow and lime 5.0kg/t steel, lime stone 2.5kg/t steel is added to 200Nm3/h, while 0.7kg/t steel is added
Aluminum shot, the silicon calcium powder of 0kg/t steel, 0kg/t steel ferrosilicon powder deoxidier, adjust argon flow to 100Nm3/h after stirring 3min；
Heated by electrodes, first heating time 9min drop later, and 1550 DEG C of liquid steel temperature after heating take refining slag specimen after first heating
It examines, inspection result is as follows: CaO:47.44%, SiO2: 16.25%, MgO:10.41%, Al2O3: 19.81%, FeO:1.2%, MnO:
1.4%；During the entire process of first heating, the submerged arc effect poor time is preceding 50s.
Embodiment 2
A kind of lime stone of the present embodiment replaces LF furnace of the calcium carbide applied to the method for LF refining for cold-forging steel SWRCH22A to refine
Process, Metal Weight 108t, the liquid steel temperature that enters the station are 1538 DEG C, after ladle enters working position, connect and open argon bottom-blowing
It adjusts argon flow and lime 4.5kg/t steel, lime stone 2.5kg/t steel is added to 250Nm3/h, while 0.6kg/t steel is added
Aluminum shot, the silicon calcium powder of 0kg/t steel, 0kg/t steel ferrosilicon powder deoxidier, adjust argon flow to 50Nm3/h after stirring 3min；It
After heated by electrodes drops, first heating time 9min, 1549 DEG C of liquid steel temperature after heating take refining slag specimen inspection after first heating
It tests, inspection result is as follows: CaO:46.95%, SiO2: 16.48%, MgO:10.52%, Al2O3: 19.23%, FeO:1.3%, MnO:
1.6%；During the entire process of first heating, the submerged arc effect poor time is preceding 54s.
Embodiment 3
A kind of lime stone of the present embodiment replaces LF furnace of the calcium carbide applied to the method for LF refining for screw-thread steel HRB400E to refine
Journey, Metal Weight 110t, the liquid steel temperature that enters the station are 1500 DEG C, after ladle enters working position, connect and open BOTTOM ARGON BLOWING controlled atmosphere
Argon flow is saved to 150Nm3/h, lime 3.0kg/t steel, lime stone 2.0kg/t steel is added, at the same be added 0kg/t steel aluminum shot,
The ferrosilicon powder deoxidier of the silicon calcium powder of 0.5kg/t steel, 1.0kg/t steel adjusts argon flow to 80Nm3/h after stirring 3min；It
After heated by electrodes drops, first heating time 7min, 1510 DEG C of liquid steel temperature after heating take refining slag specimen inspection after first heating
It tests, inspection result is as follows: CaO:43.27%, SiO2: 28.51%, MgO:12.7%, Al2O3: 6.52%, FeO:1.43%, MnO:
2.42%；During the entire process of first heating, the submerged arc effect poor time is preceding 75s.
Embodiment 4
A kind of lime stone of the present embodiment replaces LF furnace of the calcium carbide applied to the method for LF refining for screw-thread steel HRB400E to refine
Journey, Metal Weight 104t, the liquid steel temperature that enters the station are 1502 DEG C, after ladle enters working position, connect and open BOTTOM ARGON BLOWING controlled atmosphere
Argon flow is saved to 200Nm3/h, lime 3.5kg/t steel, lime stone 2.0kg/t steel is added, at the same be added 0kg/t steel aluminum shot,
The ferrosilicon powder deoxidier of the silicon calcium powder of 0.8kg/t steel, 0.9kg/t steel adjusts argon flow to 90Nm3/h after stirring 3min；It
After heated by electrodes drops, first heating time 8min, 1515 DEG C of liquid steel temperature after heating take refining slag specimen inspection after first heating
It tests, inspection result is as follows: CaO:44.74%, SiO2: 27.64%, MgO:11.87%, Al2O3: 7.24%, FeO:1.41%, MnO:
2.12%；During the entire process of first heating, the submerged arc effect poor time is preceding 80s.
Embodiment 5
A kind of lime stone of the present embodiment replaces LF furnace refining process of the calcium carbide applied to the method for LF refining for HPB300, molten steel
Weight is 107t, and the liquid steel temperature that enters the station is 1529 DEG C, after ladle enters working position, connects and opens argon bottom-blowing adjusting argon gas stream
Lime 4.0kg/t steel, lime stone 3.0kg/t steel is added to 250Nm3/h in amount, while the aluminum shot of 0.2kg/t steel, 0.8kg/ is added
The ferrosilicon powder deoxidier of the silicon calcium powder of t steel, 0.6kg/t steel adjusts argon flow to 90Nm3/h after stirring 4min；Drop electricity later
Pole heating, first heating time 9min, 1538 DEG C of liquid steel temperature after heating take refining slag specimen to examine, inspection after first heating
It is as follows to test result: CaO:40.25%, SiO2: 24.86%, MgO:11.37%, Al2O3: 8.69%, FeO:1.36%, MnO:2.21%；
During the entire process of first heating, the submerged arc effect poor time is preceding 62s.
Embodiment 6
A kind of lime stone of the present embodiment replaces LF furnace refining process of the calcium carbide applied to the method for LF refining for HPB300, molten steel
Weight is 106t, and the liquid steel temperature that enters the station is 1521 DEG C, after ladle enters working position, connects and opens argon bottom-blowing adjusting argon gas stream
Lime 4.0kg/t steel, lime stone 3.0kg/t steel is added to 240Nm3/h in amount, while the aluminum shot of 0.2kg/t steel, 0.8kg/ is added
The ferrosilicon powder deoxidier of the silicon calcium powder of t steel, 0.6kg/t steel adjusts argon flow to 90Nm3/h after stirring 4min；Drop electricity later
Pole heating, first heating time 8min, 1530 DEG C of liquid steel temperature after heating take refining slag specimen to examine, inspection after first heating
It is as follows to test result: CaO:41.51%, SiO2: 23.72%, MgO:10.59%, Al2O3: 8.24%, FeO:1.32%, MnO:2.18%；
During the entire process of first heating, the submerged arc effect poor time is preceding 56s.
Embodiment 7
A kind of lime stone of the present embodiment replaces LF furnace of the calcium carbide applied to the method for LF refining for cold-forging steel SWRCH22A to refine
Process, Metal Weight 107t, the liquid steel temperature that enters the station are 1525 DEG C, after ladle enters working position, connect and open argon bottom-blowing
It adjusts argon flow and lime 4.5kg/t steel, lime stone 2.2kg/t steel is added to 100Nm3/h, while 0.2kg/t steel is added
Aluminum shot, the silicon calcium powder of 0.5kg/t steel, 0.3kg/t steel ferrosilicon powder deoxidier, adjust argon flow to 60Nm3/ after stirring 5min
h；Heated by electrodes, first heating time 6min drop later, and 1520 DEG C of liquid steel temperature after heating take refining slag after first heating
Sample is examined, and inspection result is as follows: CaO:50%, SiO2: 20%, MgO:15%, Al2O3: 6%, FeO:2%, MnO:3%；It is heated for the first time
During the entire process of, the submerged arc effect poor time is preceding 60s.
Embodiment 8
A kind of lime stone of the present embodiment replaces LF furnace of the calcium carbide applied to the method for LF refining for screw-thread steel HRB400E to refine
Journey, Metal Weight 106t, the liquid steel temperature that enters the station are 1534 DEG C, after ladle enters working position, connect and open BOTTOM ARGON BLOWING controlled atmosphere
It saves argon flow and lime 4.3kg/t steel, lime stone 2.7kg/t steel is added to 300Nm3/h, while the aluminium of 0.5kg/t steel is added
The ferrosilicon powder deoxidier of grain, the silicon calcium powder of 0.6kg/t steel, 0.4kg/t steel adjusts argon flow to 70Nm3/h after stirring 5min；
Heated by electrodes, first heating time 7min drop later, and 1535 DEG C of liquid steel temperature after heating take refining slag specimen after first heating
It examines, inspection result is as follows: CaO:30%, SiO2: 30%, MgO:12%, Al2O3: 20%, FeO:1.0%, MnO:1.0%；First
During the entire process of heating, the submerged arc effect poor time is preceding 55s.
Embodiment 9
A kind of lime stone of the present embodiment replaces LF furnace refining process of the calcium carbide applied to the method for LF refining for HPB300, molten steel
Weight is 108t, and the liquid steel temperature that enters the station is 1516 DEG C, after ladle enters working position, connects and opens argon bottom-blowing adjusting argon gas stream
Lime 3.3kg/t steel, lime stone 2.7kg/t steel is added to 120Nm3/h in amount, while the aluminum shot of 0.6kg/t steel, 0.5kg/ is added
The ferrosilicon powder deoxidier of the silicon calcium powder of t steel, 0.8kg/t steel adjusts argon flow to 80Nm3/h after stirring 4min；Drop electricity later
Pole heating, first heating time 6min, 1528 DEG C of liquid steel temperature after heating take refining slag specimen to examine, inspection after first heating
It is as follows to test result: CaO:49.5%, SiO2: 15%, MgO:5%, Al2O3: 19%, FeO:1.5%, MnO:2.5%；What is heated for the first time
In whole process, the submerged arc effect poor time is preceding 58s.
Comparative example 1
By taking the LF furnace refining process of screw-thread steel HRB400E as an example, Metal Weight 109t, the liquid steel temperature that enters the station is 1538 DEG C,
After molten steel enters refining procedure, connects and adjust argon flow to 160Nm3/h, lime 3.5kg/t steel, silicon calcium powder is added
0.6kg/t steel, ferrosilicon powder 0.9kg/t steel, calcium carbide 0.6kg/t steel, after stirring 3min, adjusting argon flow to 100Nm3/h, it
After heated by electrodes drops, first heating time 8min measures 1546 DEG C of liquid steel temperature after heating, refining slag is in after first heating
Yellowish-white slag, inspection by sampling, inspection result are as follows: CaO:44.51%, SiO2: 26.54%, MgO:11.9%, Al2O3: 7.41%,
FeO:1.37%, MnO:1.95%；During the entire process of first heating, the submerged arc effect poor time is preceding 71s.
1 Cost comparisons' table of 1 embodiment 1-9 of table and comparative example
Note: remaining adds materials little to cost impact, ignores.
Through the foregoing embodiment and the LF furnace refining process of comparative example is tracked, and obtain following result: example 1-9 is adopted
Use lime stone as foaming agent, comparative example, as foaming agent, replaces calcium carbide to make refining submerged arc effect using calcium carbide using lime stone
Quite, play the role of rapid slugging arc-covering slag operation, meanwhile, it is shown by data comparison in table 1, using present techniques side
Case cost reduces, remarkable in economical benefits.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (8)
1. a kind of lime stone replaces calcium carbide applied to the method for LF refining, which is characterized in that the method is in LF refining process
In, molten steel enters the station, and after ladle enters working position, connects and opens argon bottom-blowing, lime 3.0-5.0kg/t steel, lime stone is added
2.0-3.0kg/t steel, while according to the difference of steel grade, the aluminum shot of 0-0.7kg/t steel, the silicon calcium powder of 0-0.8kg/t steel, 0- is added
The ferrosilicon powder deoxidier of 1.0kg/t steel adjusts argon flow after stirring 3-5min, drops heated by electrodes later.
2. a kind of lime stone according to claim 1 replaces calcium carbide applied to the method for LF refining, which is characterized in that described
Molten steel inlet temperature is 1500-1540 DEG C.
3. a kind of lime stone according to claim 1 replaces calcium carbide applied to the method for LF refining, which is characterized in that described
Argon bottom-blowing is connected and opens, adjusting argon flow is 100-300Nm3/h.
4. a kind of lime stone according to claim 1 replaces calcium carbide applied to the method for LF refining, which is characterized in that described
It is 50-100Nm3/h that argon flow is adjusted after stirring.
5. a kind of lime stone according to claim 1 replaces calcium carbide applied to the method for LF refining, which is characterized in that described
Heated by electrodes, first heating time 6-9min, 1510-1550 DEG C of liquid steel temperature after heating drop.
6. a kind of lime stone described in -5 any one replaces calcium carbide to be applied to the method for LF refining according to claim 1, special
Sign is that the method is suitable for smelting regular screw threads steel, cold pier steel.
7. a kind of lime stone described in -5 any one replaces calcium carbide to be applied to the method for LF refining according to claim 1, special
Sign is that the method takes refining slag specimen to examine after heating for the first time: CaO:30-50%, SiO2: 15-30%, MgO:5-15%,
Al2O3: 6-20%, FeO:1-2%, MnO:1-3%.
8. a kind of lime stone described in -5 any one replaces calcium carbide to be applied to the method for LF refining according to claim 1, special
Sign is that for the method during the entire process of first heating, the submerged arc effect poor time is preceding 50-80s.
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| CN201811244163.9A CN109338041B (en) | 2018-10-24 | 2018-10-24 | Method for applying limestone to LF refining instead of calcium carbide |
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| CN201811244163.9A CN109338041B (en) | 2018-10-24 | 2018-10-24 | Method for applying limestone to LF refining instead of calcium carbide |
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| CN115287399A (en) * | 2022-08-10 | 2022-11-04 | 柳州钢铁股份有限公司 | Submerged arc optimization control process method for deformed steel bar LF furnace |
| CN115717180A (en) * | 2022-11-01 | 2023-02-28 | 山东钢铁股份有限公司 | Method for reducing nitrogen increase of molten steel in LF refining process |
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| US20140352496A1 (en) * | 2010-03-17 | 2014-12-04 | Sms Siemag Ag | Briquette for producing a foamed slag effect in eaf technology in stainless steel production |
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| CN115287399B (en) * | 2022-08-10 | 2023-08-04 | 柳州钢铁股份有限公司 | Submerged arc optimal control process method for threaded steel LF furnace |
| CN115717180A (en) * | 2022-11-01 | 2023-02-28 | 山东钢铁股份有限公司 | Method for reducing nitrogen increase of molten steel in LF refining process |
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| CN109338041B (en) | 2021-07-20 |
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