CN108396096B - A kind of extremely low temperature, the method for ultra-high-sulfur(UHS) molten iron converter desulfuration in furnace - Google Patents
A kind of extremely low temperature, the method for ultra-high-sulfur(UHS) molten iron converter desulfuration in furnace Download PDFInfo
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- CN108396096B CN108396096B CN201710068962.4A CN201710068962A CN108396096B CN 108396096 B CN108396096 B CN 108396096B CN 201710068962 A CN201710068962 A CN 201710068962A CN 108396096 B CN108396096 B CN 108396096B
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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
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—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
- 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
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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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- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention relates to a kind of extremely low temperature, the method for ultra-high-sulfur(UHS) molten iron converter desulfuration in furnace, includes the following steps: that 1) pneumatic steelmaking is packed into system: molten iron silicon content≤0.30%, smelted using full iron；Molten iron silicon content > 0.30%, adding amount of scrap steel≤5kg/t steel；2) smelting operation: initial smelting period is blown using low rifle position, first slag charge is added after 5min, second batch slag charge, blowing to blunderbuss slagging after 13min are added after 10min；Manganese iron is added after slagging, opens and third batch slag charge is added after blowing, blowing end point rifle position is operated, tapped in time after blowing end point blunderbuss according to " high-low-low " mode.The present invention realizes the target that extremely low temperature, ultra-high-sulfur(UHS) molten iron desulfurization degree in Converter reach 70% or more, steel and ladle cleanliness can be improved, reduce production cost by the adjustment and control to converter loading system and converter smelting process process.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, more particularly to a kind of extremely low temperature, ultra-high-sulfur(UHS) molten iron converter desulfuration in furnace
Method.
Background technique
Sulfur content is greater than 0.07% (reaching as high as 0.2%), and molten iron of the temperature lower than 1200 DEG C, which is referred to as, smelts iron off-iron,
It does not have molten iron pretreatment desulfurizing condition.Extremely low temperature of the present invention, ultra-high-sulfur(UHS) molten iron refer to temperature lower than 1200 DEG C, and sulphur contains
Amount is greater than 0.10% molten iron, and such molten iron will cause tapping sulfur content height after being blended into converter, to steel, ladle cleanliness, life
Cost etc. is produced to be affected；In addition it returns to ladle when the top production LF slag needs to make acid slag class steel grade, big due to increasing sulfur content,
It causes to change steel cold recovery increased risk；In the prior art, desulfurization is added before generally using iron making for such low temperature high-sulphur molten iron
The method desulfurization of manganese iron, but effect is undesirable, maximum desulphurizing ability can only achieve 40%~50%, both increases and is produced into
This, and the target of converter desulfurization to greatest extent cannot be reached.
Summary of the invention
The present invention provides a kind of extremely low temperature, the method for ultra-high-sulfur(UHS) molten iron converter desulfuration in furnace, are made by being packed into converter
The adjustment and control of degree and converter smelting process process realize that extremely low temperature, ultra-high-sulfur(UHS) molten iron desulfurization degree in Converter reach
Steel and ladle cleanliness can be improved in 70% or more target, reduces production cost.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of extremely low temperature, the method for ultra-high-sulfur(UHS) molten iron converter desulfuration in furnace, the extremely low temperature, ultra-high-sulfur(UHS) molten iron are sulfur content
> 0.1%, temperature are lower than 1200 DEG C of molten iron；Include the following steps:
1) pneumatic steelmaking is packed into system:
According to extremely low temperature, the reasonable loading system of the molten iron condition of ultra-high-sulfur(UHS) molten iron selection, molten iron condition is according to silicone content
It is divided into two classes:
Molten iron condition one: molten iron silicon content≤0.30% is smelted using full iron, steel scrap is not added；
Molten iron condition two: molten iron silicon content > 0.30%, adding amount of scrap steel≤5kg/t steel, it is ensured that the heating of initial smelting period
Rate improves desulfurization rate in converter；
2) smelting operation:
Initial smelting period is blown using the low rifle position of 1.8~2.0m, and molten iron is made to be rapidly heated, first is added after the 5min that blows
Slag charge, including lime 18~22kg/t steel, dolomite 18~22kg/t steel；
It blowing and second batch slag charge is added after 10min, second batch slag charge includes lime 10~15kg/t steel, dolomite 3~
5kg/t steel, alternately according to " high-low-high ", blowing to blunderbuss slagging after 13min, slagging amount is total quantity of slag for rifle position operation
1/3 or more；
Manganese iron is added after slagging, opens and third batch slag charge is added after blowing, third batch slag charge includes lime 5~10kg/t steel；
Blowing end point operation: rifle position is operated according to " high-low-low " mode, it is therefore an objective to be reduced iron oxide content in slag, be reached
The purpose of further desulfurization；Blowing end point target carbon content 0.08~0.10%, temperature >=1685 DEG C, sulfur content≤0.025%；
It taps in time after blowing end point blunderbuss, anti-non-return sulphur.
The additional amount of manganese iron after slagging specifically:
When molten steel sulfur content 0.10%~0.15%, manganese iron additional amount 3.6~4.2kg/t steel；
When molten steel sulfur content > 0.15%, manganese iron additional amount 5.8~6.3kg/t steel.
Compared with prior art, the beneficial effects of the present invention are:
By being packed into the adjustment and control of system and converter smelting process process to converter, extremely low temperature, ultra-high-sulfur(UHS) iron are realized
Water desulfurization degree in Converter reaches 70% or more target, and steel and ladle cleanliness can be improved, and reduces production cost.
Detailed description of the invention
Fig. 1 is implementation group and control group tapping sulfur content average value comparison diagram in the embodiment of the present invention.
Specific embodiment
The extremely low temperature of one kind of the present invention, the method for ultra-high-sulfur(UHS) molten iron converter desulfuration in furnace, the extremely low temperature, ultra-high-sulfur(UHS) iron
Water is sulfur content > 0.1%, and temperature is lower than 1200 DEG C of molten iron；Include the following steps:
1) pneumatic steelmaking is packed into system:
According to extremely low temperature, the reasonable loading system of the molten iron condition of ultra-high-sulfur(UHS) molten iron selection, molten iron condition is according to silicone content
It is divided into two classes:
Molten iron condition one: molten iron silicon content≤0.30% is smelted using full iron, steel scrap is not added；
Molten iron condition two: molten iron silicon content > 0.30%, adding amount of scrap steel≤5kg/t steel, it is ensured that the heating of initial smelting period
Rate improves desulfurization rate in converter；
2) smelting operation:
Initial smelting period is blown using the low rifle position of 1.8~2.0m, and molten iron is made to be rapidly heated, first is added after the 5min that blows
Slag charge, including lime 18~22kg/t steel, dolomite 18~22kg/t steel；
It blowing and second batch slag charge is added after 10min, second batch slag charge includes lime 10~15kg/t steel, dolomite 3~
5kg/t steel, alternately according to " high-low-high ", blowing to blunderbuss slagging after 13min, slagging amount is total quantity of slag for rifle position operation
1/3 or more；
Manganese iron is added after slagging, opens and third batch slag charge is added after blowing, third batch slag charge includes lime 5~10kg/t steel；
Blowing end point operation: rifle position is operated according to " high-low-low " mode, it is therefore an objective to be reduced iron oxide content in slag, be reached
The purpose of further desulfurization；Blowing end point target carbon content 0.08~0.10%, temperature >=1685 DEG C, sulfur content≤0.025%；
It taps in time after blowing end point blunderbuss, anti-non-return sulphur.
The additional amount of manganese iron after slagging specifically:
When molten steel sulfur content 0.10%~0.15%, manganese iron additional amount 3.6~4.2kg/t steel；
When molten steel sulfur content > 0.15%, manganese iron additional amount 5.8~6.3kg/t steel.
Following embodiment is implemented under the premise of the technical scheme of the present invention, gives 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
Not mentionleting alone bright is conventional method.
[embodiment]
In the present embodiment, implementation group uses the method for the invention, and control group is each to smelt 9 tanks using conventional smelting process
Extremely low temperature, ultra-high-sulfur(UHS) molten iron, two groups of each tank molten steel sulfur content and molten iron temperature corresponds, and molten steel sulfur content range is
0.1~0.15%, molten iron temperature≤1200 DEG C.Specific smelting process is as follows:
1) pneumatic steelmaking is packed into system:
It is 0.1~0.15%, respectively less than 0.30% by molten iron silicon content in this present embodiment, therefore uses Quan Tieye
Refining, is not added steel scrap.
2) smelting operation:
Initial smelting period is blown using the low rifle position of 2.0m, and molten iron is made to be rapidly heated, first slag charge is added after the 5min that blows,
Including lime 18~22kg/t steel, dolomite 18~22kg/t steel；(each tank molten steel determines within this range according to actual needs to be added
Enter amount, following technological parameter is identical with this when being value range).
It blowing and second batch slag charge is added after 10min, second batch slag charge includes lime 10~15kg/t steel, dolomite 3~
5kg/t steel, alternately according to " high-low-high ", blowing to blunderbuss slagging after 13min, slagging amount is total quantity of slag for rifle position operation
1/3；
Manganese iron, the additional amount of manganese iron are added after slagging are as follows:
When molten steel sulfur content 0.10%~0.15%, manganese iron additional amount 3.6~4.2kg/t steel；
When molten steel sulfur content > 0.15%, manganese iron additional amount 5.8~6.3kg/t steel.
It opens and third batch slag charge is added after blowing, third batch slag charge includes lime 5~10kg/t steel.
Blowing end point operation: rifle position is operated according to " high-low-low " mode, it is therefore an objective to be reduced iron oxide content in slag, be reached
The purpose of further desulfurization；Blowing end point target carbon content 0.08~0.10%, temperature >=1685 DEG C, sulfur content≤0.025%；
After blowing end point blunderbuss, furnace superintendent combination clinker situation and see full-page proof (judgement tapping carbon) as a result, rule of thumb judging
Whether have tapping condition, tap in time or take corresponding treatment measures in time, the samples time such as reduction prevents that samples process is waited to return
Sulphur.
As shown in Figure 1, the tapping sulfur content average value of implementation group is 0.024%, the tapping sulfur content average value of control group
It is 0.059%, i.e., the tapping sulfur content before the method for the invention is relatively implemented after implementing averagely reduces 0.035%.
After the method for the invention is implemented, desulfurization degree is improved to 75.26% in extremely low temperature, ultra-high-sulfur(UHS) molten iron Converter.
Before the method for the invention is implemented, 2 tank of cord steel cold recovery is caused since high-sulfur returns to ladle, is not occurred after implementation
Such accident.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (2)
1. a kind of extremely low temperature, the method for ultra-high-sulfur(UHS) molten iron converter desulfuration in furnace, the extremely low temperature, ultra-high-sulfur(UHS) molten iron are sulfur content >
0.1%, temperature is lower than 1200 DEG C of molten iron；It is characterized by comprising the following steps:
1) pneumatic steelmaking is packed into system:
According to extremely low temperature, the reasonable loading system of the molten iron condition of ultra-high-sulfur(UHS) molten iron selection, molten iron condition is divided into according to silicone content
Two classes:
Molten iron condition one: molten iron silicon content≤0.30% is smelted using full iron, steel scrap is not added；
Molten iron condition two: molten iron silicon content > 0.30%, adding amount of scrap steel≤5kg/t steel, it is ensured that the heating rate of initial smelting period,
Improve desulfurization rate in converter；
2) smelting operation:
Initial smelting period is blown using the low rifle position of 1.8~2.0m, and molten iron is made to be rapidly heated, first slag is added after the 5min that blows
Material, including lime 18~22kg/t steel, dolomite 18~22kg/t steel；
Second batch slag charge is added after blowing 10min, second batch slag charge includes lime 10~15kg/t steel, 3~5kg/t of dolomite
Steel, rifle position operation according to " high-low-high " alternately, blowing to blunderbuss slagging after 13min, slagging amount be the 1/3 of total quantity of slag with
On；
Manganese iron is added after slagging, opens and third batch slag charge is added after blowing, third batch slag charge includes lime 5~10kg/t steel；
Blowing end point operation: rifle position is operated according to " high-low-low " mode, it is therefore an objective to be reduced iron oxide content in slag, be reached into one
Walk the purpose of desulfurization；Blowing end point target carbon content 0.08~0.10%, temperature >=1685 DEG C, sulfur content≤0.025%；
It taps in time after blowing end point blunderbuss, anti-non-return sulphur.
2. the extremely low temperature of one kind according to claim 1, the method for ultra-high-sulfur(UHS) molten iron converter desulfuration in furnace, which is characterized in that
The additional amount of manganese iron after slagging specifically:
When molten steel sulfur content 0.10%~0.15%, manganese iron additional amount 3.6~4.2kg/t steel；
When molten steel sulfur content > 0.15%, manganese iron additional amount 5.8~6.3kg/t steel.
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| CN201710068962.4A CN108396096B (en) | 2017-02-08 | 2017-02-08 | A kind of extremely low temperature, the method for ultra-high-sulfur(UHS) molten iron converter desulfuration in furnace |
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| CN201710068962.4A CN108396096B (en) | 2017-02-08 | 2017-02-08 | A kind of extremely low temperature, the method for ultra-high-sulfur(UHS) molten iron converter desulfuration in furnace |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06240327A (en) * | 1993-02-16 | 1994-08-30 | Nisshin Steel Co Ltd | Production of low si-low s-high mn molten iron accompanied with smelting reduction of mn ore |
| CN101294233A (en) * | 2007-04-25 | 2008-10-29 | 宝山钢铁股份有限公司 | Desilication demanganization method at same time of preprocessing hot metal |
| CN102776313A (en) * | 2012-08-20 | 2012-11-14 | 武汉钢铁(集团)公司 | Method for smelting high-phosphorus steel by low-temperature low-silicon molten iron in converter |
| CN103397146A (en) * | 2013-08-02 | 2013-11-20 | 首钢总公司 | Production method of pipeline steel |
-
2017
- 2017-02-08 CN CN201710068962.4A patent/CN108396096B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06240327A (en) * | 1993-02-16 | 1994-08-30 | Nisshin Steel Co Ltd | Production of low si-low s-high mn molten iron accompanied with smelting reduction of mn ore |
| CN101294233A (en) * | 2007-04-25 | 2008-10-29 | 宝山钢铁股份有限公司 | Desilication demanganization method at same time of preprocessing hot metal |
| CN102776313A (en) * | 2012-08-20 | 2012-11-14 | 武汉钢铁(集团)公司 | Method for smelting high-phosphorus steel by low-temperature low-silicon molten iron in converter |
| CN103397146A (en) * | 2013-08-02 | 2013-11-20 | 首钢总公司 | Production method of pipeline steel |
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