CN108715914A - A kind of scrap steel preheating method, semi-steel making process and the method for improving molten steel yield using semisteel smelting - Google Patents
A kind of scrap steel preheating method, semi-steel making process and the method for improving molten steel yield using semisteel smelting Download PDFInfo
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- CN108715914A CN108715914A CN201810561446.XA CN201810561446A CN108715914A CN 108715914 A CN108715914 A CN 108715914A CN 201810561446 A CN201810561446 A CN 201810561446A CN 108715914 A CN108715914 A CN 108715914A
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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
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
- C21C5/565—Preheating of scrap
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Abstract
The present invention provides a kind of scrap steel preheating method, semi-steel making process and the method for improving molten steel yield using semisteel smelting, is related to smelting steel scrap technical field, including：Pretreatment desulfurizing is carried out to vanadium-titanium-iron-water, after the vanadium-titanium-iron-water gone into converter extracting vanadium vanadium extraction obtain high temperature half steel；In half cylinder of steel steel scrap is carried out preheating obtained preheating scrap by scrap steel preheating method, the high temperature half steel is placed in half cylinder of steel make the scrap melting and it is mixed obtain mixing half steel, mixing half steel merging steelmaking converter is made steel.Utilize semisteel smelting special process method, half cylinder of steel waste heat and ladle baking position are made full use of, is realized to scrap steel preheating, then melts the steel scrap of preheating using high temperature half steel to obtain mixing half steel, mixing half steel is directly added into Converter and is made steel, to achieve the purpose that improve molten steel yield.
Description
Technical field
The present invention relates to steel scrap technical field is smelted, in particular to a kind of scrap steel preheating method, semi-steel making technique
Method and the method for improving molten steel yield using semisteel smelting.
Background technology
It climbs steel to be smelted using vanadium titano-magnetite, pneumatic steelmaking main material is using half after special vanadium extraction by converter blowing
Steel, carbon mass percentage is 3.4%~3.8% in the half steel that vanadium-bearing hot metal obtains after desulfurization vanadium extraction, half steel temperature fluctuation
It is average less than 1300 DEG C between 1250-1320 DEG C, and silicon, manganese fever slagging constituent content are trace in half steel, therefore half
Steel smelting heat source wretched insufficiency, molten steel yield are averagely only ton steel 30kg or so.Ironmaking production capacity limited production, steel scrap it is on the low side and
In the case of steel market are preferable, increase production the preferred approach of extra earning when improving molten steel yield.
In existing technology, it has been improved the patent literature for improving the consumption of converter steel scrap.Such as application number：
A kind of 201710597259.2 methods for heating steel scrap and improving smelting scrap ratio, this approach includes the following steps：Step 1, lead to
It crosses charge door and steel scrap is added into heating furnace body；Step 2, feeder by one of heat-accumulating burner to heating furnace body
It is interior to spray the mixed gas mixed according to a certain percentage by air and combustion gas, mixed gas is lighted, while fume extractor is logical
Another heat-accumulating burner is crossed to draw the intrinsic exhaust gas of heating furnace and discharge it heating furnace body；Step 3, when heating one section
Between after, pass through adjustable change valve, convert two heat-accumulating burners function；Step 4, above-mentioned steps are executed repeatedly 3N times, until will
Scrap heating stops heating to preset temperature.The heating means of the present invention are come using being preheated to steel scrap in scrap heating stove
Improve steel scrap the initial temperature into converter, accelerate converter heating speed, improve converter smelting efficiency and smelting in give up
Steel in the feed where ratio, reduce smelting cost.Application number：201710727285.2 promoting converter using gasification dephosphorized slag
The smelting process of scrap melting, specific method are：Carbon containing dose of dosage is 50~100kg/t when splashing slag in converter gasification dephosphorization
Slag, grate is blended into steel scrap 10t~25t after splashing slag, rocks back and forth converter for several times so that then steel scrap and clinker elementary mixing are shaken
Oxygen gun blowing drops in positive furnace body, and oxygen blow duration is 1~2 minute, and control oxygen lance position is blown firmly in 0.5~0.7m, is made in oxygen and slag
Carbon containing dose of fast reaction heat release rises oxygen rifle to normal position after the raising of steel scrap temperature, and grate is simultaneously blended into molten iron, carries out normal
Advise converter smelting；It smelts rear converter scrap ratio and reaches 15%~19%, carbon containing dose of utilization rate is more than or equal to 80%.The present invention plays
The exothermic heat of reaction effect of excess carbon, accelerates the Flashmelt to steel scrap after molten iron in gasification dephosphorized slag.Improve converter steel scrap
Than；It reduces vessel slag to discharge to outside stove, clinker iron loss is reduced, and recovery rate of iron improves.Application number：201710876831.9 a kind of
The smelting process of steel scrap stove external heat reuse.The invention discloses a kind of smelting processes of steel scrap stove external heat reuse, including 1.
First solid steel scrap is loaded into iron packet, then coal gas is passed through into the Ladle-casting apparatus being arranged outside iron packet, using coal gas in iron packet
Solid steel scrap preheated, temperature >=900 DEG C of solid scrap steel preheating, time of preheating is 70~100min；2. being to utilize
Transfer tool transports the iron packet equipped with solid steel scrap after preheating out of Ladle-casting apparatus, then utilizes overhead traveling crane by the height in ladle
Warm molten iron is blended into the iron packet equipped with solid steel scrap, and the solid steel scrap in iron packet is made all to melt, finally will be whole in iron packet
Molten iron after thawing, which pours into converter, to be smelted.
Application number：A kind of devices and user using converter slag waste heat preheating scrap and alloy of 201610729634.X
Method, discloses a kind of device and application method using converter slag waste heat preheating scrap and alloy, device mainly by steel scrap with
Alloy is added the room rooms 1# and the rooms high temperature furnace slag storage chamber 2# and constitutes.Heat-preserving cover plate is stamped at the top of the rooms 1#, lower part is pair of lamina knot
Driving hydraulic pressure lift chain is dug in the top of baking vessel's bottom plate of structure, bottom plate top margin equipped with bottom plate, and two side is equipped with and is pressed from both sides at α with bottom plate
Guide rail is dug at angle, and rear wall, which is equipped with, releases door.Slag ladle trolley track is equipped in the rooms 2#, top is the bottom plate of the rooms 1#.It used
Steel scrap or alloy are put on bottom plate, cover heat-preserving cover plate, later lead to high temperature slag ladle by Cheng Zhong, the top blind flange for opening the rooms 1#
It crosses slag ladle trolley and is transported to the rooms 2#, complete the Baking out to steel scrap or alloy.By the use of the device, converter height can be made
Warm afterheat of slags is recycled utilization, while playing the role of improving converter scrap ratio, reaches cost efficiency.But the prior art
In method there is semisteel smelting heat source insufficiency, the problem of molten steel low output.
Invention content
One of the objects of the present invention is to provide a kind of scrap steel preheating methods to be filled using semisteel smelting special process method
Divide and utilize half cylinder of steel waste heat and ladle baking position, realizes to scrap steel preheating.
The second object of the present invention is to provide a kind of method improving molten steel yield using semisteel smelting, utilizes half steel smelting
Special process method is refined, half cylinder of steel waste heat and ladle baking position is made full use of to realize to scrap steel preheating, it will using high temperature half steel
The steel scrap of preheating melts to obtain mixing half steel, to achieve the purpose that improve molten steel yield.
The third object of the present invention is to provide a kind of semi-steel making process, by constantly recycling carry out semi-steel making
Process makes steel scrap fully melt, and achievees the purpose that improve molten steel output increased.
In order to realize that the above-mentioned purpose of the present invention, spy use following technical scheme：
A kind of scrap steel preheating method, including：Steel scrap is added into half cylinder of steel, half cylinder of steel is in ladle baking position and to steel scrap
Carry out baking preheating.
Preferably, baking is preheated to 800-1000 DEG C.Such as baking preheating temperature is set as in an embodiment of the present invention
800℃、850℃、900℃、950℃、1000℃。
Preferably, a length of 0.5-2h when baking preheating.
Preferably, steel scrap total weight is the 8/100-15/100 of half steel tankage size.
Preferably, steel scrap monolithic weight is 100-200kg.Such as steel scrap monolithic weight is arranged in an embodiment of the present invention
For 100kg, 120kg, 140kg, 160kg, 180kg, 200kg.
A method of molten steel yield being improved using semisteel smelting, including：Vanadium extraction half steel, which is placed in half cylinder of steel, makes above-mentioned
Preheating scrap made from one scrap steel preheating method melts to obtain mixing half steel, and mixing half steel is made steel.
Preferably, vanadium extraction half steel temperature is 1400-1500 DEG C.Such as vanadium extraction half steel temperature in an embodiment of the present invention
It is set as 1400 DEG C, 1420 DEG C, 1440 DEG C, 1460 DEG C, 1480 DEG C, 1500 DEG C.
Preferably, desulfurization half steel is transferred to steelmaking converter steel-making.
A kind of semi-steel making process, including：Converter extracting vanadium vanadium extraction is gone to after vanadium-titanium-iron-water pretreatment desulfurizing obtains half
Steel, half steel are made steel by the method for improving molten steel yield using semisteel smelting of any of the above-described.
The dosage of each component is the optimum feed stock ratio for participating in reacting in above-mentioned technical proposal, but those skilled in the art
Can introduction according to the present invention carry out equivalent variation.Such as：Because of Parameters variation caused by the error of industrial production itself
It is equal with technical scheme of the present invention, other auxiliary agents is compounded on the basis of inventive formulation also with technical scheme of the present invention etc.
Together.
Compared with the prior art, the present invention has the advantages that：
A kind of present invention method improving molten steel yield using semisteel smelting newly developed, this method are special using semisteel smelting
Different process makes full use of half cylinder of steel waste heat and ladle baking position, realizes to scrap steel preheating, then utilizes high temperature half steel will
The steel scrap of preheating melts to obtain mixing half steel, and mixing half steel is directly added into Converter and is made steel, and molten steel production is improved to reach
The purpose of amount.
Specific implementation mode
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the invention.It is not specified in embodiment specific
Condition person carries out according to conventional conditions or manufacturer's recommended conditions.Reagents or instruments used without specified manufacturer is
The conventional products that can be obtained by commercially available purchase.
According to the first aspect of the invention, a kind of scrap steel preheating method is provided, including：It is added into half cylinder of steel useless
Steel, half cylinder of steel carry out baking preheating in ladle baking position and to steel scrap.
Preferably, baking is preheated to 800-1000 DEG C.Such as baking preheating temperature is set as in an embodiment of the present invention
800℃、850℃、900℃、950℃、1000℃。
Preferably, a length of 0.5-2h when baking preheating.Such as baking preheating duration is set as in an embodiment of the present invention
0.5h、0.8h、1.1h、1.4h、1.7h、2.0h。
Preferably, steel scrap total volume is the 8/100-15/100 of steelmaking converter capacity.Such as in an embodiment of the present invention
The ratio between steel scrap total volume and half steel tankage size are set as 8/100,9/100,10/100,12/100,14/100,15/100.
Preferably, steel scrap monolithic weight is 100-200kg.Steel scrap monolithic weight had better not be too big, and monolithic weight is excessive
It is unfavorable for Flashmelt, leads to melting time long waste thermal energy, reduces efficiency, therefore monolithic waste steel quality is in 100-200kg
It is relatively reasonable, for example, in an embodiment of the present invention steel scrap monolithic weight be set as 100kg, 120kg, 140kg, 160kg,
180kg、200kg。
According to the second aspect of the invention, a kind of method improving molten steel yield using semisteel smelting is provided, including：
Vanadium extraction half steel, which is placed in half cylinder of steel, makes preheating scrap made from the scrap steel preheating method of any of the above-described melt to obtain mixing half steel,
Mixing half steel is transferred to steelmaking converter steel-making.
Preferably, vanadium extraction half steel temperature is 1400-1500 DEG C.Vanadium extraction half steel temperature control the range purpose one be for
The needs of vanadium extraction by converter blowing, second is that in order to promote the fusing of steel scrap in half cylinder of steel.Such as vanadium extraction half in an embodiment of the present invention
Steel temperature setting is 1400 DEG C, 1420 DEG C, 1440 DEG C, 1460 DEG C, 1480 DEG C, 1500 DEG C.
According to the third aspect of the present invention, a kind of semi-steel making process is provided, including：Vanadium-titanium-iron-water is carried out
Pretreatment desulfurizing, after vanadium-titanium-iron-water gone into converter extracting vanadium vanadium extraction obtain half steel, half steel is carried by above-mentioned using semisteel smelting
The method of high molten steel yield is made steel.
The feature and performance of the present invention are described in further detail with reference to embodiments.
Embodiment 1
It is 240t that certain factory 200t steelmaking converters, which use semi-steel making, half steel tankage size, and the technological process of production is：To vanadium ferrotianium
Water carries out pretreatment desulfurizing, after the vanadium-titanium-iron-water gone into converter extracting vanadium vanadium extraction obtain 1500 DEG C of half steel, backward half cylinder of steel
Middle addition steel scrap 19.2t, steel scrap monolithic weight are 200kg, and half cylinder of steel equipped with steel scrap, which is moved to half cylinder of steel, toasts position, dries
Steel scrap is baked to 800 DEG C and obtains preheating scrap by roasting 0.5h, then half cylinder of steel equipped with preheating scrap is moved to converter extracting vanadium and goes out half
1500 DEG C of half steel is accessed in the position of steel, and preheating scrap is melted and be mixed to get with steel scrap by half steel mixes half steel steel, mixes
Half steel is directly blended into steelmaking converter, and steelmaking converter normally smelts mixing half steel.After through the invention, the case where not increasing equipment
Under, it can increase molten steel yield 19.16t per stove.
Embodiment 2
It is 240t that certain factory 200t steelmaking converters, which use semi-steel making, half steel tankage size, and the technological process of production is：To vanadium ferrotianium
Water carries out pretreatment desulfurizing, after the vanadium-titanium-iron-water gone into converter extracting vanadium vanadium extraction obtain 1480 DEG C of half steel, backward half cylinder of steel
Middle addition steel scrap 21.6t, steel scrap monolithic weight are 180kg, and half cylinder of steel equipped with steel scrap, which is moved to half cylinder of steel, toasts position, dries
Steel scrap is baked to 850 DEG C and obtains preheating scrap by roasting 0.8h, then half cylinder of steel equipped with preheating scrap is moved to converter extracting vanadium and goes out half
1480 DEG C of half steel is accessed in the position of steel, and preheating scrap is melted and be mixed to get with steel scrap by half steel mixes half steel steel, mixes
Half steel is directly blended into steelmaking converter, and steelmaking converter normally smelts mixing half steel.After through the invention, the case where not increasing equipment
Under, it can increase molten steel yield 21.54t per stove.
Embodiment 3
It is 240t that certain factory 200t steelmaking converters, which use semi-steel making, half steel tankage size, and the technological process of production is：To vanadium ferrotianium
Water carries out pretreatment desulfurizing, after the vanadium-titanium-iron-water gone into converter extracting vanadium vanadium extraction obtain 1460 DEG C of half steel, backward half cylinder of steel
Middle addition steel scrap 28.8t, steel scrap monolithic weight are 160kg, and half cylinder of steel equipped with steel scrap, which is moved to half cylinder of steel, toasts position, dries
Steel scrap is baked to 900 DEG C and obtains preheating scrap by roasting 1.1h, then half cylinder of steel equipped with preheating scrap is moved to converter extracting vanadium and goes out half
1460 DEG C of half steel is accessed in the position of steel, and preheating scrap is melted and be mixed to get with steel scrap by half steel mixes half steel steel, mixes
Half steel is directly blended into steelmaking converter, and steelmaking converter normally smelts mixing half steel.After through the invention, the case where not increasing equipment
Under, it can increase molten steel yield 27.76t per stove.
Embodiment 4
It is 240t that certain factory 200t steelmaking converters, which use semi-steel making, half steel tankage size, and the technological process of production is：To vanadium ferrotianium
Water carries out pretreatment desulfurizing, after the vanadium-titanium-iron-water gone into converter extracting vanadium vanadium extraction obtain 1440 DEG C of half steel, backward half cylinder of steel
Middle addition steel scrap 24.0t, steel scrap monolithic weight are 140kg, and half cylinder of steel equipped with steel scrap, which is moved to half cylinder of steel, toasts position, dries
Steel scrap is baked to 950 DEG C and obtains preheating scrap by roasting 1.4h, then half cylinder of steel equipped with preheating scrap is moved to converter extracting vanadium and goes out half
1440 DEG C of half steel is accessed in the position of steel, and preheating scrap is melted and be mixed to get with steel scrap by half steel mixes half steel steel, mixes
Half steel is directly blended into steelmaking converter, and steelmaking converter normally smelts mixing half steel.After through the invention, the case where not increasing equipment
Under, it can increase molten steel yield 23.94t per stove.
Embodiment 5
It is 240t that certain factory 200t steelmaking converters, which use semi-steel making, half steel tankage size, and the technological process of production is：To vanadium ferrotianium
Water carries out pretreatment desulfurizing, after the vanadium-titanium-iron-water gone into converter extracting vanadium vanadium extraction obtain 1420 DEG C of half steel, backward half cylinder of steel
Middle addition steel scrap 33.6t, steel scrap monolithic weight are 120kg, and half cylinder of steel equipped with steel scrap, which is moved to half cylinder of steel, toasts position, dries
Steel scrap is baked to 1000 DEG C and obtains preheating scrap by roasting 1.7h, then half cylinder of steel equipped with preheating scrap is moved to converter extracting vanadium and goes out half
1420 DEG C of half steel is accessed in the position of steel, and preheating scrap is melted and be mixed to get with steel scrap by half steel mixes half steel, mixes half steel
It is directly blended into steelmaking converter, steelmaking converter normally smelts half steel steel of mixing.After through the invention, the case where not increasing equipment
Under, it can increase molten steel yield 33.52t per stove.
Embodiment 6
It is 240t that certain factory 200t steelmaking converters, which use semi-steel making, half steel tankage size, and the technological process of production is：To vanadium ferrotianium
Water carries out pretreatment desulfurizing, after the vanadium-titanium-iron-water gone into converter extracting vanadium vanadium extraction obtain 1400 DEG C of half steel, backward half cylinder of steel
Middle addition steel scrap 36.0t, steel scrap monolithic weight are 100kg, and half cylinder of steel equipped with steel scrap, which is moved to half cylinder of steel, toasts position, dries
Steel scrap is baked to 1000 DEG C and obtains preheating scrap by roasting 2.0h, then half cylinder of steel equipped with preheating scrap is moved to converter extracting vanadium and goes out half
1400 DEG C of half steel is accessed in the position of steel, and preheating scrap is melted and be mixed to get with steel scrap by half steel mixes half steel, mixes half steel
It is directly blended into steelmaking converter, steelmaking converter normally smelts half steel steel of mixing.After through the invention, the case where not increasing equipment
Under, it can increase molten steel yield 35.94t per stove.
A kind of present invention method improving molten steel yield using semisteel smelting newly developed, the party into hot-metal bottle by adding
Enter steel scrap, using hot-metal bottle waste heat and hot-metal bottle transportational process gas toast station by scrap steel preheating, then utilizes high temperature half steel will
The steel scrap of preheating melts to obtain mixing half steel, and mixing half steel is directly added into Converter and is made steel, and molten steel production is improved to reach
The purpose of amount.
Although illustrate and describing the present invention with specific embodiment, it will be appreciated that without departing substantially from the present invention's
Many other change and modification can be made in the case of spirit and scope.It is, therefore, intended that wrapping in the following claims
Include all such changes and modifications belonged in the scope of the invention.
Claims (10)
1. a kind of scrap steel preheating method, which is characterized in that including：Steel scrap is added into half cylinder of steel, half cylinder of steel is dried in ladle
Roasting position simultaneously carries out baking preheating to the steel scrap.
2. a kind of scrap steel preheating method described in accordance with the claim 1, which is characterized in that baking is preheated to 800-1000 DEG C.
3. a kind of scrap steel preheating method according to claim 2, which is characterized in that a length of 0.5-2h when baking preheating.
4. a kind of scrap steel preheating method described in accordance with the claim 1, which is characterized in that the steel scrap total weight is the half steel
The 8/100-15/100 of tankage size.
5. a kind of scrap steel preheating method described in accordance with the claim 1, which is characterized in that the steel scrap monolithic weight is 100-
200kg。
6. a kind of method improving molten steel yield using semisteel smelting, which is characterized in that including：By vanadium extraction half steel merging described half
Cylinder of steel makes preheating scrap made from claim 1-5 any one of them scrap steel preheating methods melt to obtain mixing half steel, by institute
Mixing half steel is stated to be made steel.
7. a kind of method improving molten steel yield using semisteel smelting according to claim 6, which is characterized in that described to carry
Vanadium half steel temperature is 1400-1500 DEG C.
8. a kind of method improving molten steel yield using semisteel smelting according to claim 6, which is characterized in that will be described
Desulfurization half steel is being blended into steelmaking converter steel-making after being transferred to converter extracting vanadium vanadium extraction.
9. a kind of semi-steel making process, which is characterized in that including：Vanadium-titanium-iron-water goes to converter extracting vanadium vanadium extraction and obtains half steel,
The half steel is made steel by claim 6-8 any one of them using the method that semisteel smelting improves molten steel yield.
10. a kind of method improving molten steel yield using semisteel smelting according to claim 9, which is characterized in that described
Pretreatment desulfurizing operation is carried out before vanadium-titanium-iron-water vanadium extraction.
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| CN201810561446.XA CN108715914A (en) | 2018-06-01 | 2018-06-01 | A kind of scrap steel preheating method, semi-steel making process and the method for improving molten steel yield using semisteel smelting |
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| CN201810561446.XA CN108715914A (en) | 2018-06-01 | 2018-06-01 | A kind of scrap steel preheating method, semi-steel making process and the method for improving molten steel yield using semisteel smelting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109652607A (en) * | 2019-01-23 | 2019-04-19 | 河钢股份有限公司承德分公司 | Steel-making increases the control method of scrap ratio under a kind of duplex technique |
| CN112453375A (en) * | 2020-10-22 | 2021-03-09 | 河钢股份有限公司承德分公司 | Method for utilizing ladle waste heat |
| CN113061682A (en) * | 2021-03-24 | 2021-07-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for increasing consumption of semisteel smelting steel scrap |
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| CN103882181A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Manganese-containing steel alloying process |
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| CN103882181A (en) * | 2012-12-21 | 2014-06-25 | 鞍钢股份有限公司 | Manganese-containing steel alloying process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109652607A (en) * | 2019-01-23 | 2019-04-19 | 河钢股份有限公司承德分公司 | Steel-making increases the control method of scrap ratio under a kind of duplex technique |
| CN112453375A (en) * | 2020-10-22 | 2021-03-09 | 河钢股份有限公司承德分公司 | Method for utilizing ladle waste heat |
| CN112453375B (en) * | 2020-10-22 | 2022-06-14 | 河钢股份有限公司承德分公司 | Method for utilizing ladle waste heat |
| CN113061682A (en) * | 2021-03-24 | 2021-07-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for increasing consumption of semisteel smelting steel scrap |
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Application publication date: 20181030 |