CN107299182A - A kind of method that converter utilizes scrap smelting half steel - Google Patents
A kind of method that converter utilizes scrap smelting half steel Download PDFInfo
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- CN107299182A CN107299182A CN201710582279.2A CN201710582279A CN107299182A CN 107299182 A CN107299182 A CN 107299182A CN 201710582279 A CN201710582279 A CN 201710582279A CN 107299182 A CN107299182 A CN 107299182A
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- steel
- half steel
- scrap
- converter
- control
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
-
- 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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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of method that converter utilizes scrap smelting half steel, methods described includes feed stock for blast furnace control, blowing control and half steel tapping control；The feed stock for blast furnace control, siliceous, carbonaceous concurrent heating carburant is added using high hopper.Siliceous and carbon raw material is added at the top of converter molten pool and oxygen is blown into and realizes steel scrap heating and carburetting, realizes that converter utilizes scrap smelting half steel.Smelting process is continuously added to steel scrap and regular discharge unit half steel realizes melting continuously.When the present invention is solved by molten bath top addition carbonaceous material, carbon can be achieved 100% without main equipment transformation and utilize steel scrap melting continuously half steel in molten bath fusing speed and efficiency, converter.Converter preferably resolves molten steel nitrogen pick-up, the hydrogenation problem that converter is caused using carbonaceous material heating using the technique of scrap smelting half steel and then duplex steelmaking, and the inventive method has higher application value in STEELMAKING PRODUCTION.
Description
Technical field
The invention belongs to the method that metallurgical technology field, specifically related to a kind of converter utilize scrap smelting half steel.
Background technology
With socio-economic development, the yield of steel scrap will be continuously increased, its as a kind of reusable edible material, how
Carry out the problem effectively put using turning into face of metallargist.Using converter system melting waste steel, conventional technology has two
Secondary burning, the technology such as scrap steel preheating molten bath bottom Coal powder spray.Such technology steel scrap use ratio and smelting cycle are by compared with the day of one's doom
System, the molten steel nitrogen pick-up caused using the concurrent heating material such as coal dust, hydrogenation problem are difficult to solve.Using bottom coal powder injection powder craft, equipment is thrown
Money is big, safeguards complicated, furnace life is a greater impact.
The present invention relates to the method that scrap smelting half steel is continuously added in the converter equipped with a part of molten iron or half steel.It is molten
Siliceous and carbon raw material is added at the top of pond and oxygen is blown into and realizes steel scrap heating and carburetting.Smelting process is continuously added to steel scrap and fixed
Phase discharge unit half steel realizes melting continuously.Semisteel smelting is turned into qualified molten steel using another block converter and then converter is realized
100% is made steel using steel scrap.
The present invention realizes that converter utilizes scrap smelting half steel, due to half steel carbon content ＞ 3.0%, in follow-up semisteel smelting mistake
Molten steel nitrogen pick-up, hydrogenation problem are eliminated in journey.Used cooperatively using siliceous raw material+carbon raw material, and rational feed way, into
The rate of carburization for solving the problems, such as steel scrap rapid melting and top plus carbonaceous material of work(, realizes the semisteel smelting of efficient stable.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of method that converter utilizes scrap smelting half steel.
In order to solve the above technical problems, the present invention is adopted the technical scheme that：A kind of converter utilizes scrap smelting half steel
Method, methods described includes feed stock for blast furnace control, blowing control and half steel tapping control；The feed stock for blast furnace control, using height
Position feed bin adds siliceous, carbonaceous concurrent heating carburant.
Feed stock for blast furnace control of the present invention, first adds siliceous, carbonaceous concurrent heating carburant, converter, which is tilted, to be made by high hopper
Steel scrap is added with hopper, grate to blow position starts oxygen blast.The method can increase substantially melting of the carbonaceous material in molten bath
Carburetting, it is ensured that half steel carbon content ＞ 3.0%.
Feed stock for blast furnace control of the present invention, siliceous, carbonaceous concurrent heating carburant use ratio is 1:0.8-1:1.5；It is described
Siliceous concurrent heating agent main chemical compositions are Si：55-95%；The carbonaceous concurrent heating carburant main chemical compositions are C >=80%.
In feed stock for blast furnace control of the present invention, initial and smelting process, molten iron or half steel total amount account for Converter in molten bath
The 30-90% of appearance, afterwards hopper be continuously added to steel scrap, each adding amount of scrap steel is not more than the 30% of BOF nominal capacity.Steel scrap
Species, which is limited, uses broken material steel scrap and lightweight briquetting type steel scrap.
Siliceous concurrent heating agent main chemical compositions of the present invention are Si：75%；The carbonaceous concurrent heating carburant primary chemical into
It is divided into C：85%.
Blowing control of the present invention, basicity of slag R≤2.0.It is main to use lime slag making, form 50-100kg/t slag
Measure to realize converter slag-making requirement.Due to being difficult to improve using a large amount of siliceous material basicity, bath temperature is low to influence small to furnace lining,
Slag making only ensures the quantity of slag.
Blowing control of the present invention, bottom blowing intensity 0.05-0.40Nm3/ tmin, scrap melting is promoted by bottom blowing,
The preferred nitrogen of bottom blown gas.
Blowing control of the present invention, top blast oxygen realizes heating and melting bath stirring, and preferably top blast oxygen intensity is
3.2-3.8Nm3/t·min。
Half steel tapping control of the present invention, half steel during blow off:C：1300-1500 DEG C of 3.0-3.5%, temperature.Fusing every time
The steel scrap time is 3-10min.
Half steel tapping of the present invention terminates remaining half steel in rear molten bath and is not less than the 30% of BOF nominal capacity, afterwards not
It is disconnected to add steel scrap, aforesaid operations are repeated, melting continuously is realized.
Steel scrap technical indicator of the present invention refers to the related content in GB 4223-2004 scrap iron and steels.
After half steel tapping of the present invention terminates, remaining half steel is more than the 30% of BOF nominal capacity in molten bath, afterwards constantly
Steel scrap is added, aforesaid operations is repeated, realizes melting continuously.
Above-mentioned technical proposal of the present invention, coordinates another block converter routinely to smelt, and converter system 100% can be achieved and uses steel scrap
Steel-making.The concrete technology of " another block converter is routinely smelted " is this area conventional techniques, refers to following technique（It is not limited to
This technique）：Half steel and a certain proportion of steel scrap are again loaded into converter, steel scrap ratio is the 0%-15% of heat size.Using lime and
The slag charge slag making such as dolomite, the heating of oxygen blast gas decarbonization.In order to reach rational target basicity and temperature requirement, it can be suitably added and contain
Silicon materials match somebody with somebody basicity, use ferrosilicon concurrent heating.Stop oxygen blast when reaching the target calls such as terminal aim carbon, temperature, tap.Can be real
Existing converter terminal is as follows：
It is using the beneficial effect produced by above-mentioned technical proposal：1st, present invention one kind continuously uses scrap smelting in converter
The method of half steel, coordinates another block converter routinely to smelt, and converter system 100% can be achieved and is made steel using steel scrap.2nd, the present invention is common
Top and bottom complex blowing steelmaking converter main equipment is used cooperatively without being transformed using siliceous raw material+carbon raw material, and is reasonably added
Material mode, successfully solves the problems, such as the rate of carburization of steel scrap rapid melting and top plus carbonaceous material, realizes efficient stable
Semisteel smelting.3rd, the present invention realizes that converter utilizes scrap smelting half steel, due to half steel carbon content ＞ 3.0%, in follow-up semisteel smelting
During eliminate molten steel nitrogen pick-up, hydrogenation problem.4th, feature of the present invention with high degree of flexibility and changeability, while advanced
The application of computer control system, makes this invention have higher reliability and repeatability.5th, converter smelting half steel of the invention
Method is able to the extremely advantageous and efficient production half steel under suitable equipment condition, while being conducive to a large amount of in common steel mill
Industrialization recycling is carried out to steel scrap.6th, the inventive method has higher application value in STEELMAKING PRODUCTION.
Embodiment
With reference to specific embodiment, the present invention will be further described in detail.
Embodiment 1
Change steel scrap technique：（Due to using steel scrap carburetting technology, carbon increasing amount and blow loss maintain an equal level, that is, load steel scrap amount and half steel
Tap is suitable）
100t converter smeltings, enter stove molten iron：C：4.22%, Si：0.80%, P：0.129%, 1226 DEG C of molten iron temperature.Mended using siliceous
Thermit powder Si：95%；Use carbonaceous concurrent heating carburant C：80%.
Weight of molten iron 90t, is continuously added to steel scrap.Add 10 tons of steel scrap for the first time, siliceous concurrent heating agent 660kg is mended using carbonaceous
Hot carburant 990kg；Go out 70 tons of half steel, remaining 30 tons of half steel in stove；Second plus 10 tons of steel scrap, siliceous concurrent heating agent 663kg make
With carbonaceous concurrent heating carburant 991kg；10 tons of third time plus steel scrap, siliceous concurrent heating agent 663kg use carbonaceous concurrent heating carburant
991kg；4th time plus 30 tons of steel scrap, siliceous concurrent heating agent 1989kg use carbonaceous concurrent heating carburant 2973kg；Go out 40 tons of half steel,
Remaining 40 tons of half steel, continues plus steel scrap melting continuously in stove.
Master blows procedure parameter：Basicity of slag 2.0, top blast oxygen intensity 3.8Nm3/ tmin, bottom blowing nitrogen air supply intensity
0.08Nm3/t·min；Each melting waste steel time is 3-6min.
Half steel tapping terminates remaining half steel in rear molten bath and is more than the 30% of BOF nominal capacity, steel scrap is constantly added afterwards, weight
Multiple aforesaid operations, realize melting continuously.
Half steel tap 110t, C in iron bag：3.5%, 1500 DEG C of temperature.
Semisteel smelting technique：
100t converter smeltings, half steel all enters stove, adds 15 tons of steel scraps.Use lime and silica slag making, oxygen decarburization heating.Eventually
Point situation is as follows：
Embodiment 2
Change steel scrap technique：（Due to using steel scrap carburetting technology, carbon increasing amount and blow loss maintain an equal level, that is, load steel scrap amount and half steel
Tap is suitable）
100t converter smeltings, enter stove molten iron：C：4.22%, Si：0.80%, P：0.129%, 1226 DEG C of molten iron temperature.Mended using siliceous
Thermit powder Si：55%；Use carbonaceous concurrent heating carburant C：90%.
Weight of molten iron 30t, is continuously added to steel scrap.Add 10 tons of steel scrap for the first time, siliceous concurrent heating agent 1140kg is mended using carbonaceous
Hot carburant 912kg；Second plus 10 tons of steel scrap, siliceous concurrent heating agent 1140kg use carbonaceous concurrent heating carburant 912kg；3rd
Secondary plus 10 tons of steel scrap, siliceous concurrent heating agent 1140kg uses carbonaceous concurrent heating carburant 912kg；4th time plus 30 tons of steel scrap, it is siliceous to mend
Thermit powder 3420kg, uses carbonaceous concurrent heating carburant 2736kg；Go out 50 tons of half steel, remaining 40 tons of half steel in stove；5th time plus steel scrap
30 tons, siliceous concurrent heating agent 3420kg uses carbonaceous concurrent heating carburant 2736kg；6th time plus 30 tons of steel scrap, siliceous concurrent heating agent
3420kg, uses carbonaceous concurrent heating carburant 2736kg；Go out 60 tons of half steel, remaining 40 tons of half steel, continues plus the continuous smelting of steel scrap in stove
Refining.
Master blows procedure parameter：Basicity of slag 1.0, top blast oxygen intensity 3.2Nm3/ tmin, bottom blowing nitrogen air supply intensity
0.4Nm3/t·min；Each melting waste steel time is 4-10min.
Half steel tap 110t, C in iron bag：3.0%, 1300 DEG C of temperature.
Semisteel smelting technique：
100t converter smeltings, half steel all enters stove, without using steel scrap.Use lime and ferrosilicon slag making, oxygen decarburization heating.Terminal
Situation is as follows：
Embodiment 3
Change steel scrap technique：（Due to using steel scrap carburetting technology, carbon increasing amount and blow loss maintain an equal level, that is, load steel scrap amount and half steel
Tap is suitable）
100t converter smeltings, enter stove molten iron：C：4.36%, Si：0.55%, P：0.112%, 1277 DEG C of molten iron temperature.Mended using siliceous
Thermit powder Si：75%；Use carbonaceous concurrent heating carburant C：85%.
Weight of molten iron 50t, is continuously added to steel scrap.Add 10 tons of steel scrap for the first time, siliceous concurrent heating agent 1200kg is mended using carbonaceous
Hot carburant 1200kg；Second plus 10 tons of steel scrap, siliceous concurrent heating agent 1200kg use carbonaceous concurrent heating carburant 1200kg；The
Three times plus 10 tons of steel scrap, siliceous concurrent heating agent 1200kg use carbonaceous concurrent heating carburant 1200kg；4th time plus 30 tons of steel scrap, silicon
Matter concurrent heating agent 3600kg, uses carbonaceous concurrent heating carburant 3600kg；Go out 50 tons of half steel, remaining 40 tons of half steel in stove；5th time plus
30 tons of steel scrap, siliceous concurrent heating agent 3600kg, using carbonaceous concurrent heating carburant 3600kg, goes out 60 tons of half steel, remaining half steel 30 in stove
Ton, continues plus steel scrap melting continuously.
Master blows procedure parameter：Basicity of slag 1.5, top blast oxygen intensity 3.5Nm3/ tmin, bottom blowing nitrogen air supply intensity
0.05Nm3/t·min；Each melting waste steel time is 5-10min.
Half steel tap 110t, C in iron bag：3.27%, 1420 DEG C of temperature.
Semisteel smelting technique：
100t converter smeltings, half steel all enters stove, adds 10 tons of steel scraps.Use lime and silica slag making, oxygen decarburization heating.Eventually
Point situation is as follows：
Above example is only used to illustrative and not limiting technical scheme, although entering with reference to above-described embodiment to the present invention
Go detailed description, it will be understood by those within the art that：Still the present invention can be modified or equally replaced
Change, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover will in right of the invention
Ask among scope.
Claims (10)
1. a kind of method that converter utilizes scrap smelting half steel, it is characterised in that methods described includes feed stock for blast furnace control, blowing
Control and half steel tapping control；The feed stock for blast furnace control, siliceous, carbonaceous concurrent heating carburant is added using high hopper.
2. the method that a kind of converter according to claim 1 utilizes scrap smelting half steel, it is characterised in that it is described enter stove it is former
Material control, first adds siliceous, carbonaceous concurrent heating carburant by high hopper, and converter is tilted adds steel scrap using hopper, and grate is to blowing
Refining position starts oxygen blast.
3. the method that a kind of converter according to claim 1 utilizes scrap smelting half steel, it is characterised in that it is described enter stove it is former
Material control, siliceous, carbonaceous concurrent heating carburant use ratio is 1:0.8-1:1.5；The siliceous concurrent heating agent main chemical compositions are
Si：55-95%；The carbonaceous concurrent heating carburant main chemical compositions are C >=80%.
4. the method that a kind of converter according to claim 1-3 any one utilizes scrap smelting half steel, it is characterised in that
In the feed stock for blast furnace control, initial and smelting process, molten iron or half steel total amount account for the 30-90% of converter heat size in molten bath, afterwards
Hopper is continuously added to steel scrap, and each adding amount of scrap steel is not more than the 30% of BOF nominal capacity.
5. the method that a kind of converter according to claim 1-3 any one utilizes scrap smelting half steel, it is characterised in that
The siliceous concurrent heating agent main chemical compositions are Si：75%；The carbonaceous concurrent heating carburant main chemical compositions are C：85%.
6. the method that a kind of converter according to claim 1-3 any one utilizes scrap smelting half steel, it is characterised in that
The blowing control, basicity of slag R≤2.0.
7. the method that a kind of converter according to claim 1-3 any one utilizes scrap smelting half steel, it is characterised in that
The blowing control, bottom blowing intensity 0.05-0.40Nm3/ tmin, scrap melting, the preferred nitrogen of bottom blown gas are promoted by bottom blowing
Gas.
8. the method that a kind of converter according to claim 1-3 any one utilizes scrap smelting half steel, it is characterised in that
The blowing control, top blast oxygen realizes heating and melting bath stirring, and top blast oxygen intensity is 3.2-3.8Nm3/t·min。
9. the method that a kind of converter according to claim 1-3 any one utilizes scrap smelting half steel, it is characterised in that
The half steel tapping control, half steel during blow off:C：1300-1500 DEG C of 3.0-3.5%, temperature, the half steel tapping control, every time
The melting waste steel time is 3-10min.
10. the method that a kind of converter according to claim 1-3 any one utilizes scrap smelting half steel, its feature exists
In, the half steel tapping terminates remaining half steel in rear molten bath and is not less than the 30% of BOF nominal capacity, and steel scrap is constantly added afterwards,
Aforesaid operations are repeated, melting continuously is realized.
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| CN201710582279.2A CN107299182B (en) | 2017-07-17 | 2017-07-17 | A kind of method that converter utilizes scrap smelting half steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108998619A (en) * | 2018-08-21 | 2018-12-14 | 成渝钒钛科技有限公司 | A method of reducing the converter smelting period |
| CN110184406A (en) * | 2019-07-12 | 2019-08-30 | 河钢股份有限公司承德分公司 | A kind of method for making steel for improving steel scrap and ratio being added |
| CN110306005A (en) * | 2018-03-20 | 2019-10-08 | 邯郸钢铁集团有限责任公司 | A kind of high scrap ratio process for making suitable for 120~260 tons of converters |
| CN110438294A (en) * | 2019-09-09 | 2019-11-12 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of half steel increase heat source |
| CN115747404A (en) * | 2022-11-07 | 2023-03-07 | 河钢乐亭钢铁有限公司 | Cold material adding method in converter process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS60194007A (en) * | 1984-03-13 | 1985-10-02 | Kobe Steel Ltd | Converter blowing method |
| CN1552919A (en) * | 2003-05-29 | 2004-12-08 | 宝山钢铁股份有限公司 | Converter oxide and nitrogen top-blown dephosphorizing method |
| CN101638706A (en) * | 2009-08-25 | 2010-02-03 | 承德新新钒钛股份有限公司 | Liquid steel pre-deoxidizing technology in steelmaking revolving furnace |
| CN104178682A (en) * | 2014-08-12 | 2014-12-03 | 首钢京唐钢铁联合有限责任公司 | Preparation method of IF (Interstitial Free) steel containing phosphorus, silicon and manganese |
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2017
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60194007A (en) * | 1984-03-13 | 1985-10-02 | Kobe Steel Ltd | Converter blowing method |
| CN1552919A (en) * | 2003-05-29 | 2004-12-08 | 宝山钢铁股份有限公司 | Converter oxide and nitrogen top-blown dephosphorizing method |
| CN101638706A (en) * | 2009-08-25 | 2010-02-03 | 承德新新钒钛股份有限公司 | Liquid steel pre-deoxidizing technology in steelmaking revolving furnace |
| CN104178682A (en) * | 2014-08-12 | 2014-12-03 | 首钢京唐钢铁联合有限责任公司 | Preparation method of IF (Interstitial Free) steel containing phosphorus, silicon and manganese |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110306005A (en) * | 2018-03-20 | 2019-10-08 | 邯郸钢铁集团有限责任公司 | A kind of high scrap ratio process for making suitable for 120~260 tons of converters |
| CN108998619A (en) * | 2018-08-21 | 2018-12-14 | 成渝钒钛科技有限公司 | A method of reducing the converter smelting period |
| CN110184406A (en) * | 2019-07-12 | 2019-08-30 | 河钢股份有限公司承德分公司 | A kind of method for making steel for improving steel scrap and ratio being added |
| CN110438294A (en) * | 2019-09-09 | 2019-11-12 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of half steel increase heat source |
| CN115747404A (en) * | 2022-11-07 | 2023-03-07 | 河钢乐亭钢铁有限公司 | Cold material adding method in converter process |
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| CN107299182B (en) | 2019-09-10 |
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