CN108676946A - A kind of whole process reduces the smelting process of molten steel consumption - Google Patents
A kind of whole process reduces the smelting process of molten steel consumption Download PDFInfo
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- CN108676946A CN108676946A CN201810615197.8A CN201810615197A CN108676946A CN 108676946 A CN108676946 A CN 108676946A CN 201810615197 A CN201810615197 A CN 201810615197A CN 108676946 A CN108676946 A CN 108676946A
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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
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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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
- C21C7/0068—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by introducing material into a current of streaming metal
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Abstract
A kind of whole process of the present invention reduces the smelting process of molten steel consumption, and during blast furnace casting, steel scrap before iron is added into iron runner, and addition is the 1% ~ 2% of weight of molten iron, using molten iron waste heat by scrap melting；Before molten iron pours into iron packet, the iron packet steel scrap of iron packet nominal capacity 5% ~ 8% is added into iron packet, and by toasting online, improve steel scrap temperature, reduce temperature drop when iron packet iron making, improve melting efficiency of the fish torpedo ladle to iron packet steel scrap when iron packet iron making；The converter steel scrap of BOF nominal capacity 20% ~ 25% is added in converter smelting, terminates in smelting, steel scrap after the stove of converter tapping quantity 1% ~ 2% is added in converter tapping process, steel scrap after the stove of ladle molten steel weight 1% ~ 2% is added during LF refining.The molten steel consumption for smelting each process can be greatly reduced in the present invention, while realizing the recycling of steel scrap；The present invention is identical in iron water amount compared with conventional smelting process, and molten steel yield can be improved 15% or more.
Description
Technical field
The present invention relates to the smelting processes that a kind of whole process reduces molten steel consumption, belong to converter steeling technology field.
Technical background
Steel and iron industry environment protection treating dynamics is continued to increase with the increasingly exhausted and country of iron ore resource, as refining
The production of the molten iron of steel process main material starts to be affected, and hot metal supply amount significantly reduces, and corresponding steel scrap provides
Source is but continuously increased, and especially after country bans intermediate frequency furnace smelting, scrap resources are more rich, how in low iron loss, height
Qualified molten steel is produced under conditions of scrap ratio becomes each iron and steel enterprise's focus of attention.Although traditional electric furnace production technology can be with
Meet the production requirement of high scrap ratio, low molten iron, but domestic steel mill is mainly based on converter at present, if making converter into electricity
Stove cost of investment is higher；And converter is by molten iron heat due to being influenced, adding amount of scrap steel is only 20% or so, molten steel consumption amount
It is very big；To solve problems, part iron enterprise study and has achieved certain effect, such as：Patent No.
The Chinese patent application of 201710850784 .0 discloses a kind of temperature raising method of low molten steel consumption pneumatic steelmaking, and this method is
Increase converter steel scrap ratio, reduces molten steel consumption and converter heat is compensated as heating agent using coke, ferrosilicon, purpose
Be reduce converter molten steel consumption, consider Converter before, how iron loss reduces after stove, and after adopting this method converter operate
Stability by extreme influence, converter lining service life, bottom-blowing of converter effect are also by extreme influence.For this purpose, exploitation is a kind of both
Converter operation is not influenced, and the smelting process that can reduce molten steel consumption to greatest extent becomes each steel mill focus of attention.
Invention content
The purpose of the present invention is to provide the smelting processes that a kind of whole process reduces molten steel consumption, according to ironmaking, steelmaker
The melting capacity of ordered pair steel scrap, by different classes of steel scrap in batches, be quantitatively adding smelt whole process process in, ensure smelt
While molten steel qualification, molten steel consumption is significantly reduced, improves scrap ratio.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of whole process reduces the smelting process of molten steel consumption, first, by steel scrap by steel scrap before iron, iron packet steel scrap, converter steel scrap,
Steel scrap is processed, stores classifiedly after stove；During blast furnace casting, steel scrap before iron is added into iron runner, addition is molten iron
The 1% ~ 2% of weight, using molten iron waste heat by scrap melting；Before molten iron pours into iron packet, iron packet nominal capacity is added into iron packet
5% ~ 8% iron packet steel scrap, and by toasting online, improve steel scrap temperature, reduces temperature drop when iron packet iron making, improve fish torpedo ladle to
The melting efficiency of iron packet steel scrap when iron packet iron making；The converter steel scrap of BOF nominal capacity 20% ~ 25% is added in converter smelting,
Smelting terminates, and steel scrap after the stove of converter tapping quantity 1% ~ 2% is added in converter tapping process, ladle steel is added during LF refining
Steel scrap after the stove of water weight 1% ~ 2%.
A kind of above-mentioned whole process reduces the smelting process of molten steel consumption, the specific steps are：
Step 1：Steel scrap is processed by steel scrap after steel scrap, iron packet steel scrap, converter steel scrap, stove before iron, is stored classifiedly；
Step 2：According to blast furnace casting temperature, during blast furnace casting, steel scrap before iron is continuously added into iron runner, addition is
The 1% ~ 2% of fish torpedo ladle molten iron nominal capacity；
Step 3：Confirm the molten iron temperature in fish torpedo ladle, according to molten iron temperature, iron packet steel scrap is added into iron packet, addition is iron
Iron packet after addition steel scrap is transferred to baking position and toasted, ensures that steel scrap temperature is baked to by the 5% ~ 8% of packet nominal capacity
800 DEG C or more；
Step 4：After baking, Jiang Tiebao is hung to ladle-to-ladle position and carries out iron making, is washed away iron using liquid molten iron in fish torpedo ladle
Scrap melting in packet；
Step 5：Thermometric is carried out to the iron packet that steel scrap has been completely melt, then sampling is hoisted to converter and carries out iron making, according to iron
Iron clad coolant-temperature gage, the converter steel scrap that BOF nominal capacity 20% ~ 25% is added are smelted, and blowing end point temperature correction often smelts temperature
Degree improves 20 DEG C ~ 30 DEG C；
Step 6：Smelting finishes, and in ladle tapping 1/4, steel scrap after the stove of converter tapping quantity 1% ~ 2% is added out of high hopper；
Steel scrap must add when tapping 2/3 after stove；
Step 7：During LF refining, from steel scrap after the stove that ladle molten steel weight 1% ~ 2% is added in high hopper.
A kind of above-mentioned whole process reduces the smelting process of molten steel consumption, and steel scrap is thickness 2mm before the iron in the step 1
Thin plate leftover pieces below；Iron packet steel scrap is fluffy reinforcing bar briquetting or punching press prompt industrial scrap；Steel-making steel scrap is heavy-duty waste steel
With medium-sized steel scrap；Steel scrap is that cleaning is cut off without greasy dirt, non-corroding, without the reinforcing bar being mingled with after stove.
A kind of above-mentioned whole process reduces the smelting process of molten steel consumption, and the blast furnace casting temperature in the step 2 is
1350℃~1450℃；Molten iron temperature is 1300 DEG C ~ 1400 DEG C in fish torpedo ladle in the step 3；To iron Bao Neijia in step 3
The best opportunity for entering iron packet steel scrap is after the molten iron in upper stove iron packet has converted iron to converter in 3min.
A kind of above-mentioned whole process reduces the smelting process of molten steel consumption, and iron iron clad coolant-temperature gage is more than etc. in the step 5
When 1300 DEG C, converter steel scrap is added by the 23% ~ 25% of BOF nominal capacity, when iron iron clad coolant-temperature gage is less than 1300 DEG C, presses and turns
Converter steel scrap is added in the 20% ~ 22% of stove nominal capacity；When there is difference in the practical outlet temperature of converter and target temperature using coke
Charcoal carries out temperature raising, and coke is added with the first batch of material, and coke size is 10mm ~ 20mm, and addition is by ton steel heating efficiency 5 DEG C ~ 6
℃/kg。
A kind of above-mentioned whole process reduces the smelting process of molten steel consumption, and steel scrap is added portionwise after stove in the step 7, often
It criticizes and is no more than 1 ton；After addition, need that LF power-on times are appropriately extended, extended power-on time presses 2min ~ 3min/ tons of stoves
Steel scrap controls afterwards；
Beneficial effects of the present invention are：The present invention by ironmaking, steel-making whole process each process in different classes of steel scrap is added,
The molten steel consumption for smelting each process can be greatly reduced, while realizing the recycling of steel scrap, effectively reduce the row of carbon dioxide
High-volume；The present invention is smaller on converter smelting operation influence, disclosure satisfy that the production requirement of steel mill efficiently, stable, ton steel synthesis
Molten steel consumption can be down to 800kg/t or less；The present invention is identical in iron water amount compared with conventional smelting process, molten steel
Yield can be improved 15% or more.
Specific implementation mode
A kind of whole process of the present invention reduces the smelting process of molten steel consumption, first, steel scrap is divided into steel scrap before iron, iron packet gives up
Steel scrap after steel, converter steel scrap, stove；Steel scrap is mainly thickness in 2mm thin plate leftover pieces below wherein before iron, this kind of steel scrap is thin,
And size is small, is easy fusing, such as packaging iron sheet, silicon steel sheet, automobile iron sheet broken material；Iron packet steel scrap is mainly fluffy steel
The prompt industrial scrap of muscle briquetting or stamping parts, this kind of steel scrap good permeability are penetrated conducive to flame and are toasted；It is main to make steel steel scrap
For heavy-duty waste steel or medium-sized steel scrap, such as slab base head, base tail, middle plate edges of boards, this kind of steel scrap is heavier, is added in converter available turn
The heat of stove is completely melt, and is controlled conducive to converter temperature；Steel scrap is mainly clean reinforcing bar cropping after stove, and length exists
Between 60mm ~ 120mm, a diameter of φ 8mm ~ φ 25mm, since such steel scrap will have a direct impact on quality of molten steel, so this kind of steel scrap
It must be mingled with without greasy dirt, non-corroding, nothing；
Specific step is：During blast furnace casting, molten iron temperature is 1350 DEG C ~ 1450 DEG C, using mechanical arm or overhead traveling crane
Continuously into trough, steel scrap, addition are the 1% ~ 2% of fish torpedo ladle molten iron nominal capacity before addition iron, will using molten iron waste heat
Scrap melting；Then the molten iron temperature in fish torpedo ladle is confirmed at 1300 DEG C ~ 1400 DEG C, and iron packet steel scrap is added into iron packet, adds
Enter 5% ~ 8% that amount is iron packet nominal capacity, the iron packet after addition steel scrap, which is transferred to baking position, to be toasted, and ensures steel scrap temperature
It is baked to 800 DEG C or more；After baking, Jiang Tiebao is hung to ladle-to-ladle position and carries out iron making, is rushed using liquid molten iron in fish torpedo ladle
It brushes the scrap melting in iron packet；Thermometric is carried out to the iron packet that steel scrap has been completely melt, then sampling is hoisted to converter progress
Iron making, according to iron iron clad coolant-temperature gage, the converter steel scrap that BOF nominal capacity 20% ~ 25% is added is smelted, blowing end point temperature
More normal smelting temperature improves 20 DEG C ~ 30 DEG C；Smelting finishes, and in ladle tapping 1/4, converter tapping is added out of high hopper
Steel scrap after the stove of amount 1% ~ 2%；Steel scrap must add when tapping 2/3 after stove；During LF refining, steel is added from high hopper
Steel scrap after the stove of packet Metal Weight 1% ~ 2%, while suitably increasing power-on time, power-on time presses 2min ~ 3min/ tons of steel scrap controls
System.Each step of the present invention continuously should be carried out closely, reduced intermediate biography every the time, reduced temperature losses of the process, maximal efficiency utilized
Journey heat.
With reference to embodiment, the invention will be further described：
In following example 1-embodiment 4, the nominal capacity of Iron-smelting fish torpedo ladle is 600 tons, and converter is 260 tons of top and bottom complex blowings
Converter, smelting steel grade are Q235B：
Embodiment 1
Blast furnace casting temperature is 1450 DEG C, during tapping a blast furnace, before the iron of 12t is added portionwise into trough with mechanical arm
Steel scrap using the physical thermal of high temperature liquid iron by scrap melting before iron, and is flowed into fish torpedo ladle, after steel scrap is added before iron, torpedo
Molten iron temperature in tank is down to 1397 DEG C, and for the hot metal temperature drop for reducing in fish torpedo ladle, fish torpedo ladle uses Capping operation；Using machinery
21 tons of iron packet steel scraps are added into iron packet for arm（It is the 8% of iron packet nominal capacity）, and iron packet is hoisted to iron packet baking position and is carried out
Baking, after being baked to 800 DEG C or more, is hoisted to ladle-to-ladle position, the molten iron in fish torpedo ladle is poured into iron packet, utilize the physics of molten iron
For heat by iron packet scrap melting, molten iron addition is 218t；Molten iron temperature is 1340 DEG C after the completion of ladle-to-ladle, Si contents 0.35wt%；It will
Iron packet is hoisted to converter and carries out iron making, after iron making, 65 tons of converter steel scraps is added, converter terminal is by 1680 DEG C of controls, more normal smelting
1650 DEG C of refining improves 30 DEG C；According to hot metal composition, temperature information, molten iron charge weight, converter steel scrap charge weight information, converter is utilized
It is 1625 DEG C that converter terminal temperature, which is calculated, in the static models of steel-making, 55 DEG C is differed for 1680 DEG C compared with desired value, in the first batch of material
2.9 tons of coke are added when charging to be smelted, 1681 DEG C of converter terminal temperature, when converter tapping is to 1/4, in high hopper plus
Enter steel scrap after 5 tons of stoves, after stove steel scrap tap 2/3 when add, 1638 DEG C of thermometric after stove；During LF refining plus after 5 tons of stoves
Steel scrap, steel scrap is added three times after 5 tons of stoves, is no more than 2 tons every time, refining power-on time extends 15min.Molten steel composition closes
Lattice meet production requirement.
The practical Cheng Gangliang of the present embodiment is 285 tons, 213.64 tons of actual consumption molten iron, and relatively normal smelt reduces molten steel consumption
37 tons, practical ton steel water consumption 749.6kg.
Embodiment 2
Blast furnace casting temperature is 1400 DEG C, during tapping a blast furnace, before the iron of 8t is added portionwise into trough with mechanical arm
Steel scrap with the physical thermal of high temperature liquid iron by scrap melting before iron, and is flowed into fish torpedo ladle, after steel scrap is added before iron, fish torpedo ladle
Interior molten iron temperature is down to 1347 DEG C, and for the hot metal temperature drop for reducing in fish torpedo ladle, fish torpedo ladle uses Capping operation；Iron packet has converted iron
Afterwards, about 17 tons of iron packet steel scraps are added into iron packet using mechanical arm（It is the 6.5% of iron packet nominal capacity）, and by iron packet handling
It is toasted to iron packet baking position, after being baked to 800 DEG C or more, is hoisted to ladle-to-ladle position, the molten iron in fish torpedo ladle is poured into Tie Bao
Interior, using the physical thermal of molten iron by iron packet scrap melting, molten iron addition is 221t；Molten iron temperature is 1300 after the completion of ladle-to-ladle
DEG C, Si contents 0.49wt%, Jiang Tiebao are hoisted to converter progress iron making, and 60 tons of converter steel scraps of addition, converter terminal are pressed after iron making
1670 DEG C of controls, it is relatively normal to smelt 1650 DEG C of 20 DEG C of raisings, it is packed into according to hot metal composition, temperature information, molten iron charge weight, steel scrap
Information is measured, it is 1627 DEG C that converter terminal temperature, which is calculated, using the static models of pneumatic steelmaking, compared with 1670 DEG C of differences of desired value
43 DEG C, when the first batch of material feeds, 2 tons of coke of addition are smelted, 1669 DEG C of converter terminal temperature, in converter tapping to 1/4
When, the steel scrap after 5 tons of stoves are added in high hopper, after stove steel scrap tap 2/3 when add, 1627 DEG C of thermometric after stove, in LF refining
Steel scrap in the process plus after 5 tons of stoves, 3 batches of additions of steel scrap point after 5 tons of stoves, every batch of are no more than 2 tons, and refining power-on time extends
15min.Molten steel composition is qualified, meets production requirement.
The practical Cheng Gangliang of this example is 286 tons, 218 tons of actual consumption molten iron, and relatively normal smelt reduces 30 tons of molten steel consumption,
Practical ton steel water consumption 762.2kg.
Embodiment 3
Blast furnace casting temperature is 1350 DEG C, during tapping a blast furnace, before the iron of 6t is added portionwise into trough with mechanical arm
Steel scrap with the physical thermal of high temperature liquid iron by scrap melting before iron, and is flowed into fish torpedo ladle, after steel scrap is added before iron, fish torpedo ladle
Interior molten iron temperature is down to 1305 DEG C, and for the hot metal temperature drop for reducing in fish torpedo ladle, fish torpedo ladle uses Capping operation；Iron packet has converted iron
Afterwards, about 13 tons of iron packet steel scraps are added into iron packet using mechanical arm（It is the 5% of iron packet nominal capacity）, and iron packet is hoisted to
Iron packet baking position is toasted, and after being baked to 800 DEG C or more, is hoisted to ladle-to-ladle position, the molten iron in fish torpedo ladle is poured into iron packet,
Using the physical thermal of molten iron by iron packet scrap melting, molten iron addition is 225t；Molten iron temperature is 1265 DEG C after the completion of ladle-to-ladle, Si
Content 0.55wt%, Jiang Tiebao are hoisted to converter progress iron making, 52 tons of converter steel scraps of addition after iron making, and converter terminal presses 1660 DEG C
Control, it is relatively normal to smelt 1640 DEG C of 20 DEG C of raisings, believed according to hot metal composition, temperature information, molten iron charge weight, steel scrap charge weight
Breath, it is 1630 DEG C that converter terminal temperature, which is calculated, using the static models of pneumatic steelmaking, and 30 DEG C are differed for 1660 DEG C compared with desired value,
800kg coke is added when the first batch of material feeds to be smelted, 1664 DEG C of converter terminal temperature, when converter tapping is to 1/4,
Steel scrap after 3 tons of stoves is added in high hopper, and steel scrap is added in tapping 2/3 after stove, 1637 DEG C of thermometric after stove, during LF refining
Add steel scrap after 6 tons of stoves, 3 batches of additions of steel scrap point after 6 tons of stoves, every batch of is no more than 2 tons, and refining power-on time extends 6min.Steel
Water constituent is qualified, meets production requirement.
The practical Cheng Gangliang of this example is 284 tons, 222 tons of actual consumption molten iron, and relatively normal smelt reduces 21 tons of molten steel consumption,
Practical ton steel water consumption 781.7kg.
Embodiment 4
Blast furnace casting temperature is 1350 DEG C, during tapping a blast furnace, before the iron of 6t is added portionwise into trough with mechanical arm
Steel scrap with the physical thermal of high temperature liquid iron by scrap melting before iron, and is flowed into fish torpedo ladle, after steel scrap is added before iron, fish torpedo ladle
Interior molten iron temperature is down to 1300 DEG C, and for the hot metal temperature drop for reducing in fish torpedo ladle, fish torpedo ladle uses Capping operation；Iron packet has converted iron
Afterwards, about 12 tons of iron packet steel scraps are added into iron packet using mechanical arm（It is the 5% of iron packet nominal capacity）, and iron packet is hoisted to
Iron packet baking position is toasted, and after being baked to 800 DEG C or more, is hoisted to ladle-to-ladle position, the molten iron in fish torpedo ladle is poured into iron packet,
Using the physical thermal of molten iron by iron packet scrap melting, molten iron addition is 225t；Molten iron temperature is 1220 DEG C after the completion of ladle-to-ladle, Si
Content 0.45wt%, Jiang Tiebao are hoisted to converter progress iron making, 50 tons of converter steel scraps of addition after iron making, and converter terminal presses 1660 DEG C
Control, it is relatively normal to smelt 1640 DEG C of 20 DEG C of raisings, believed according to hot metal composition, temperature information, molten iron charge weight, steel scrap charge weight
Breath, it is 1665 DEG C that converter terminal temperature, which is calculated, using the static models of pneumatic steelmaking, and need not heat up agent, converter terminal temperature
1661 DEG C of degree, when converter tapping is to 1/4, the steel scrap after 3 tons of stoves are added in high hopper, after stove steel scrap tap 2/3 when add,
1637 DEG C of thermometric after stove, steel scrap during LF refining plus after 5 tons of stoves, 2 batches of additions of steel scrap point, every batch of do not surpass at most after 5 tons of stoves
2 tons are crossed, refining power-on time extends 11min.Molten steel composition is qualified, meets production requirement.
The practical Cheng Gangliang of this example is 283 tons, 223 tons of actual consumption molten iron, and relatively normal smelt reduces 21 tons of molten steel consumption,
Practical ton steel water consumption 787.9kg.
Claims (6)
1. a kind of whole process reduces the smelting process of molten steel consumption, it is characterised in that：First, by steel scrap by steel scrap, Tie Bao before iron
Steel scrap is processed, stores classifiedly after steel scrap, converter steel scrap, stove；During blast furnace casting, give up before iron is added into iron runner
Steel, addition is the 1% ~ 2% of weight of molten iron, using molten iron waste heat by scrap melting；Before molten iron pours into iron packet, to iron Bao Neijia
Enter the iron packet steel scrap of iron packet nominal capacity 5% ~ 8%, and by toasting online, improves steel scrap temperature, reduce temperature when iron packet iron making
Drop improves melting efficiency of the fish torpedo ladle to iron packet steel scrap when iron packet iron making；In converter smelting be added BOF nominal capacity 20% ~
25% converter steel scrap, terminates in smelting, steel scrap after the stove of converter tapping quantity 1% ~ 2% is added in converter tapping process, in LF refining
Steel scrap after the stove of addition ladle molten steel weight 1% ~ 2% in the process.
2. a kind of whole process as described in claim 1 reduces the smelting process of molten steel consumption, it is characterised in that：Including following step
Suddenly：
Step 1：Steel scrap is processed by steel scrap after steel scrap, iron packet steel scrap, converter steel scrap, stove before iron, is stored classifiedly；
Step 2：According to blast furnace casting temperature, during blast furnace casting, steel scrap before iron is continuously added into iron runner, addition is
The 1% ~ 2% of fish torpedo ladle molten iron nominal capacity；
Step 3：Confirm the molten iron temperature in fish torpedo ladle, according to molten iron temperature, iron packet steel scrap is added into iron packet, addition is iron
Iron packet after addition steel scrap is transferred to baking position and toasted, ensures that steel scrap temperature is baked to by the 5% ~ 8% of packet nominal capacity
800 DEG C or more；
Step 4：After baking, Jiang Tiebao is hung to ladle-to-ladle position and carries out iron making, is washed away iron using liquid molten iron in fish torpedo ladle
Scrap melting in packet；
Step 5：Thermometric is carried out to the iron packet that steel scrap has been completely melt, then sampling is hoisted to converter and carries out iron making, according to iron
Iron clad coolant-temperature gage, the converter steel scrap that BOF nominal capacity 20% ~ 25% is added are smelted, and blowing end point temperature correction often smelts temperature
Degree improves 20 DEG C ~ 30 DEG C；
Step 6：Smelting finishes, and in ladle tapping 1/4, steel scrap after the stove of converter tapping quantity 1% ~ 2% is added out of high hopper；
Steel scrap must add when tapping 2/3 after stove；
Step 7：During LF refining, from steel scrap after the stove that ladle molten steel weight 1% ~ 2% is added in high hopper.
3. a kind of whole process as claimed in claim 2 reduces the smelting process of molten steel consumption, it is characterised in that：The step 1
In iron before steel scrap be thickness 2mm thin plate leftover pieces below；Iron packet steel scrap is useless for fluffy reinforcing bar briquetting or punching press leftover pieces
Steel；It is heavy-duty waste steel and medium-sized steel scrap to make steel steel scrap；Steel scrap is that cleaning is cut off without greasy dirt, non-corroding, without the reinforcing bar being mingled with after stove.
4. a kind of whole process as claimed in claim 2 reduces the smelting process of molten steel consumption, it is characterised in that：The step 2
In blast furnace casting temperature be 1350 DEG C ~ 1450 DEG C；Molten iron temperature is 1300 DEG C ~ 1400 DEG C in fish torpedo ladle in the step 3；
The best opportunity that iron packet steel scrap is added in step 3 into iron packet is 3min after the molten iron in upper stove iron packet has converted iron to converter
It is interior.
5. a kind of whole process as claimed in claim 2 reduces the smelting process of molten steel consumption, it is characterised in that：The step 5
When middle iron iron clad coolant-temperature gage is more than or equal to 1300 DEG C, converter steel scrap, iron iron clad water temperature is added by the 23% ~ 25% of BOF nominal capacity
When degree is less than 1300 DEG C, converter steel scrap is added by the 20% ~ 22% of BOF nominal capacity；When the practical outlet temperature of converter and target temperature
Temperature raising is carried out using coke when difference occurs in degree, coke is added with the first batch of material, and coke size is 10mm ~ 20mm, and addition is pressed
Ton steel heating 5 DEG C of efficiency ~ 6 DEG C/kg.
6. a kind of whole process as claimed in claim 2 reduces the smelting process of molten steel consumption, it is characterised in that：
Steel scrap is added portionwise after stove in the step 7, and every batch of is no more than 1 ton；After addition, when needing that LF power supplies are appropriately extended
Between, extended power-on time is controlled by steel scrap after 2min ~ 3min/ tons of stoves.
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| CN110241283A (en) * | 2019-06-13 | 2019-09-17 | 首钢集团有限公司 | A kind of converter of desulfurization slag iron utilizes method |
| CN110396566A (en) * | 2019-07-26 | 2019-11-01 | 首钢集团有限公司 | A kind of method that desulfurization slag iron is eaten in converter time |
| CN110628980A (en) * | 2019-08-27 | 2019-12-31 | 江苏省沙钢钢铁研究院有限公司 | Smelting method for improving scrap steel ratio by preheating scrap steel in iron ladle through oxygen combustion gun |
| CN111154943A (en) * | 2019-12-26 | 2020-05-15 | 河钢股份有限公司承德分公司 | Method for improving steel scrap ratio in long-flow steelmaking |
| CN111235339A (en) * | 2020-02-14 | 2020-06-05 | 中冶赛迪工程技术股份有限公司 | Process capable of adjusting furnace burden collocation of converter |
| CN111378806A (en) * | 2018-12-30 | 2020-07-07 | 新疆八一钢铁股份有限公司 | Operation method for digesting high-sulfur waste steel by converter iron ladle |
| CN111607677A (en) * | 2019-02-24 | 2020-09-01 | 新疆八一钢铁股份有限公司 | Operation method for reducing iron loss of molten iron torpedo ladle |
| CN111719027A (en) * | 2020-05-14 | 2020-09-29 | 成渝钒钛科技有限公司 | Method for recovering high-grade heat energy of blast furnace slag |
| CN113278873A (en) * | 2021-05-20 | 2021-08-20 | 攀钢集团研究院有限公司 | Method for increasing semisteel yield in vanadium-titanium molten iron smelting |
| CN113462843A (en) * | 2020-03-30 | 2021-10-01 | 上海梅山钢铁股份有限公司 | Method for adding scrap steel into torpedo tank |
| CN113913581A (en) * | 2021-09-02 | 2022-01-11 | 山东莱钢永锋钢铁有限公司 | Method for improving utilization rate of converter smelting scrap steel |
| CN114540568A (en) * | 2022-04-26 | 2022-05-27 | 天津钢铁集团有限公司 | Smelting method for improving scrap steel ratio |
| CN114703335A (en) * | 2022-02-19 | 2022-07-05 | 阳春新钢铁有限责任公司 | Control method for reducing iron loss by reasonably collocating scrap steel in 120t converter |
| CN114891945A (en) * | 2022-02-17 | 2022-08-12 | 阳春新钢铁有限责任公司 | Treatment method for reducing iron and steel material consumption and iron consumption final slag oxidizability of converter |
| CN114934140A (en) * | 2022-05-09 | 2022-08-23 | 河北新金轧材有限公司 | Organization process for reducing temperature drop of molten iron |
| CN115369204A (en) * | 2022-08-29 | 2022-11-22 | 宝武集团鄂城钢铁有限公司 | Production method for reducing iron-steel ratio |
| CN115418431A (en) * | 2022-08-03 | 2022-12-02 | 新疆八一钢铁股份有限公司 | Operation method for external pretreatment of high-sulfur steel scrap |
| CN115820972A (en) * | 2022-11-22 | 2023-03-21 | 山东钢铁股份有限公司 | Method for reducing blowing loss of scrap steel in converter steelmaking process |
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|---|---|---|---|---|
| CN111378806A (en) * | 2018-12-30 | 2020-07-07 | 新疆八一钢铁股份有限公司 | Operation method for digesting high-sulfur waste steel by converter iron ladle |
| CN111607677A (en) * | 2019-02-24 | 2020-09-01 | 新疆八一钢铁股份有限公司 | Operation method for reducing iron loss of molten iron torpedo ladle |
| CN110129499B (en) * | 2019-05-21 | 2020-10-13 | 德龙钢铁有限公司 | Method for producing molten iron by adding scrap steel into blast furnace |
| CN110129499A (en) * | 2019-05-21 | 2019-08-16 | 德龙钢铁有限公司 | A kind of method of blast furnace addition steel scrap production molten iron |
| CN110241283A (en) * | 2019-06-13 | 2019-09-17 | 首钢集团有限公司 | A kind of converter of desulfurization slag iron utilizes method |
| CN110396566A (en) * | 2019-07-26 | 2019-11-01 | 首钢集团有限公司 | A kind of method that desulfurization slag iron is eaten in converter time |
| CN110628980A (en) * | 2019-08-27 | 2019-12-31 | 江苏省沙钢钢铁研究院有限公司 | Smelting method for improving scrap steel ratio by preheating scrap steel in iron ladle through oxygen combustion gun |
| CN111154943B (en) * | 2019-12-26 | 2021-11-19 | 河钢股份有限公司承德分公司 | Method for improving steel scrap ratio in long-flow steelmaking |
| CN111154943A (en) * | 2019-12-26 | 2020-05-15 | 河钢股份有限公司承德分公司 | Method for improving steel scrap ratio in long-flow steelmaking |
| CN111235339A (en) * | 2020-02-14 | 2020-06-05 | 中冶赛迪工程技术股份有限公司 | Process capable of adjusting furnace burden collocation of converter |
| CN113462843A (en) * | 2020-03-30 | 2021-10-01 | 上海梅山钢铁股份有限公司 | Method for adding scrap steel into torpedo tank |
| CN111719027A (en) * | 2020-05-14 | 2020-09-29 | 成渝钒钛科技有限公司 | Method for recovering high-grade heat energy of blast furnace slag |
| CN113278873A (en) * | 2021-05-20 | 2021-08-20 | 攀钢集团研究院有限公司 | Method for increasing semisteel yield in vanadium-titanium molten iron smelting |
| CN113913581A (en) * | 2021-09-02 | 2022-01-11 | 山东莱钢永锋钢铁有限公司 | Method for improving utilization rate of converter smelting scrap steel |
| CN114891945A (en) * | 2022-02-17 | 2022-08-12 | 阳春新钢铁有限责任公司 | Treatment method for reducing iron and steel material consumption and iron consumption final slag oxidizability of converter |
| CN114703335A (en) * | 2022-02-19 | 2022-07-05 | 阳春新钢铁有限责任公司 | Control method for reducing iron loss by reasonably collocating scrap steel in 120t converter |
| CN114540568A (en) * | 2022-04-26 | 2022-05-27 | 天津钢铁集团有限公司 | Smelting method for improving scrap steel ratio |
| CN114934140A (en) * | 2022-05-09 | 2022-08-23 | 河北新金轧材有限公司 | Organization process for reducing temperature drop of molten iron |
| CN114934140B (en) * | 2022-05-09 | 2024-04-26 | 河北新金轧材有限公司 | Organization process for reducing molten iron temperature drop |
| CN115418431A (en) * | 2022-08-03 | 2022-12-02 | 新疆八一钢铁股份有限公司 | Operation method for external pretreatment of high-sulfur steel scrap |
| CN115369204A (en) * | 2022-08-29 | 2022-11-22 | 宝武集团鄂城钢铁有限公司 | Production method for reducing iron-steel ratio |
| CN115369204B (en) * | 2022-08-29 | 2024-01-19 | 宝武集团鄂城钢铁有限公司 | Production method for reducing iron-steel ratio |
| CN115820972A (en) * | 2022-11-22 | 2023-03-21 | 山东钢铁股份有限公司 | Method for reducing blowing loss of scrap steel in converter steelmaking process |
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Application publication date: 20181019 |