CN105671237B - A kind of inexpensive slag making dephosphorization technology of converter smelting high phosphorus hot metal - Google Patents
A kind of inexpensive slag making dephosphorization technology of converter smelting high phosphorus hot metal Download PDFInfo
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- CN105671237B CN105671237B CN201610151799.3A CN201610151799A CN105671237B CN 105671237 B CN105671237 B CN 105671237B CN 201610151799 A CN201610151799 A CN 201610151799A CN 105671237 B CN105671237 B CN 105671237B
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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
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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
- C21C5/36—Processes yielding slags of special composition
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—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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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a kind of inexpensive slag making dephosphorization technologies of converter smelting high phosphorus hot metal.The slag making dephosphorization technology include stay slag to splash slag, primary charging, primary blowing, the stove that falls are slagged tap, secondary charging, secondary blowing and terminal point control and tapping process, stay finishing slag to splash slag, repetitive cycling above-mentioned operation entirely again after tapping.The ingredient and property of gained finishing slag be：CaO 35~48%, MgO 8~14%, SiO2 8~13%, TFe 10.20~18.50%, P2O5 2.50~5.60%, basicity 2.5~6.The slag making dephosphorization technology carries out global optimization to the smelting of high phosphorus hot metal, partially and fully substitutes the materials such as high price slagging agent, magnesite ball, light dolomite using the sinter return fine and unprocessed dolomite of cheap environmental protection, has formulated corresponding process system.Ensure to balance heat more than needed while smooth dephosphorization, slag beneficiation, P2O5And finishing slag content of MgO increases, and 8 yuan/t or more of slag making cost is reduced while protecting furnace lining and reaching dephosphorization effect, furnace life is improved by 12000 stoves to 15000 stoves, and application value is high.
Description
Technical field
The invention belongs to converter smelting slag making dephosphorizing technology fields, and in particular to a kind of converter smelting high phosphorus hot metal it is low at
This slag making dephosphorization technology.
Background technology
Wuhan Iron And Steel Group Kunming Iron ＆ Steel Co., Ltd is contained using self-produced cheap high phosphorus ore ironmaking, the high phosphorus hot metal phosphorus of production
Amount up to 0.35~0.80%, average out to 0.62% has been in the top standard of domestic and international industrial mass production, with steel row
The needs of aggravation and Business survival that industry homogeneity is striven unexpectedly need constantly to reduce slag making dephosphorization cost.The present invention passes through to converter
Traditional slagging process of smelting is investigated and is analyzed, it is found that traditional slagging process has the following problems：
（1）Since tapping duration is short, transport is short, hot metal temperature drop is small, and smelting process heat is more than needed, since the steel scrap pig iron is purchased
Difficulty, generally use high price active lime and light dolomite come balancing converter smelting process waste heat, thus slag making cost
It is high.
（2）To promote dephosphorization, generally use slagging agent and compacting lump ore participate in slugging, due to slagging agent and pressing block
Mine makes and purchase cost is high, is unfavorable for the reduction of slag making cost.
（3）Mainly by the way that the content of MgO in light dolomite and high price magnesite ball raising clinker is added, when heat is had more than needed
Still other slag charge coolings such as lime, compacting lump ore are used, the balance of lining durability raising and process heat is unfavorable for.
（4）There are slag charge addition opportunity, the opportunity of falling stove, rifle positions to control unreasonable place for former technique, as magnesite ball is added
It is poured out too early with double slags too early, slagging agent is added too early slugging effect difficulty and embodies, when double slag opportunitys of falling stove are too early and terminal is blown deeply
Between it is insufficient the problems such as.
It is asked for above-mentioned converter smelting high phosphorus hot metal heat is more than needed, slugging effect is poor, slag charge consumption is high, slag making is of high cost
Topic, the present invention is directed to by analysis, design and the smelting process operating duty for improving high phosphorus hot metal converter smelting each stage, propose
A kind of inexpensive slag making dephosphorization technology of converter smelting high phosphorus hot metal realizes smooth dephosphorization and effectively reduces comprehensive slag making cost
Purpose.
Invention content
The purpose of the present invention is to provide a kind of inexpensive slag making dephosphorization technologies of converter smelting high phosphorus hot metal.
The object of the present invention is achieved like this：The inexpensive slag making dephosphorization technology of the converter smelting high phosphorus hot metal, packet
Include stay slag to splash slag, primary charging, primary blowing, the stove that falls are slagged tap, secondary charging, secondary blowing and terminal point control and tapping process,
It specifically includes：
A, slag is stayed to splash slag：After tapping, finishing slag is all stayed in stove, 1710 ~ 1760 DEG C of in-furnace temperature；By 3 ~ 4kg/
Unprocessed dolomite is added in t steel, under the conditions of the pressure of 0.78~0.95MPa and the rifle position of control 800mm~1400mm, is sprayed with spray gun
Penetrate 2.80~3.20 m3The nitrogen of/t steel min, blows and splashes 3.5~5.0min, all splashes dry stay in stove；
B, primary charging：It splashes slag to finish, lime is added by 12 ~ 16kg/t steel to furnace bottom, is added by 6~8kg/t steel light-burned
High phosphorus hot metal and steel scrap are added converter and wait refining by dolomite, 1270 DEG C of molten iron temperature ＞；
C, primary blowing：Lower rifle blows into the raw materials for metallurgy and slag charge of stove, when blowing 2~3min30s first slags start fusing,
Divide 2~3 batches that lime is added by 6~10kg/t steel, 5kg/t steel addition unprocessed dolomite is disposably pressed after the 4min that blows；Open oxygen blast
Rifle rifle position by 1100mm control, blowing 5min process rifle positions by 1300 ~ 1400mm control, blow 7min after rifle position press 1200~
1600mm is controlled, and oxygen pressure is 0.70 ~ 0.80MPa, 2.95 ~ 3.50m of oxygen supply intensity3/ t steel min, one time duration of blast is total
Count 6~8min；
D, the stove that falls is slagged tap：After primary blowing stops, pouring out high phosphorus clinker early period, the primary liquid steel temperature of falling stove for 1550~
1600℃；
E, secondary charging：Sinter return fine is added by 5kg/t steel into stove before secondary blowing；
F, secondary blowing：Lower rifle carries out secondary blowing, opens and is added lime by 12~14kg/t steel when blowing 2min, when 4min again
Unprocessed dolomite is added by 6~8kg/t steel, light dolomite is added by 8~12kg/t；When slugging situation is good, sintering is added and returns
5~6kg/t of sinter return fine is added when slugging difficulty in 3~4kg/t of mine, opens and blows rifle position and controlled by 1300mm, process rifle position is pressed
1400mm is controlled, and rifle position is improved when 6min30s ~ 6min40s to 1800mm 28 ~ 35s of slugging, rifle position is by 1400mm controls after slugging
System；0.75 ~ 0.85MPa of oxygen pressure, 3.50 ~ 4.00m of oxygen supply intensity3/ t steel min；
G, terminal point control and tapping：The thermometric of falling stove samples after 6~8min of secondary blowing；3.0 ~ 4.5kg/t steel is pressed after stove
Lime is added, when furnace temperature is 1590~1610 DEG C, unprocessed dolomite 2kg/t is added, when furnace temperature is 1610~1630
DEG C when, be added unprocessed dolomite 4kg/t, continue dephosphorization heat up 20 ~ 45s, when tap outlet temperature >=1650 DEG C when, by rifle position
900mm blows 30s controls deeply, if outlet temperature is less than 1650 DEG C, by it is deep blow 0.6 DEG C/s of heating rate be warming up to liquid steel temperature >=
1650℃；Lime, the tapping of falling stove, control tapping time >=4.00min is added by 4 ~ 6kg/t steel when blowing end point；After tapping again
Finishing slag is stayed to splash slag, the above-mentioned A ~ G processes of repetitive cycling entirely.
Slag making dephosphorization technology of the present invention has following advantages and effect compared with prior art：
（1）Slag making is participated in by using unprocessed dolomite and makees coolant use when heat is had more than needed, instead of high price magnesite
Ball and part light dolomite reduce ton steel slag making cost, improve in finishing slag（MgO）Content is conducive to converter lining life
It improves.
（2）By using self-produced low price sinter return fine slag making, the slugging component dephosphorization in sinter return fine is made full use of
And recovery section Fe effectively reduces slag making cost instead of high price slagging agent.
（3）By improving slagging process, extends the process system that the primary time of falling stove rifle position low with terminal is blown deeply, ensure that
The uniformity of dephosphorization rate and molten steel composition.
（4）The slag making dephosphorization technology, which can smoothly smoothly take off the phosphorus in high phosphorus hot metal to steel grade from 0.35~0.80%, to be wanted
In the range of asking（≤0.028%）, reach reduction by 8 yuan/t or more of ton steel overall cost and furnace life improved by 12000 stoves to 15000
The effect of stove.
（5）The application of the slag making dephosphorization technology is not necessarily to be transformed existing converter smelting equipment, equipment interoperability
It is good, it is easy to produce on popularization and application.
Specific implementation mode
The present invention is further illustrated below, but is not limited in any way to the present invention, based on the present invention
It is any made by introduction to transform or replace, it all belongs to the scope of protection of the present invention.
The inexpensive slag making dephosphorization technology of converter smelting high phosphorus hot metal of the present invention, including stay slag splash slag, primary charging,
Primary blowing, the stove that falls slag tap, secondary charging, secondary blowing and terminal point control and tapping process, specifically include：
It is described to stay slag to splash slag process to refer to：After tapping, finishing slag is all stayed in stove, in-furnace temperature 1710 ~ 1760
℃；Unprocessed dolomite is added by 3 ~ 4kg/t steel, in the rifle position condition of the pressure and control 800mm~1400mm of 0.78~0.95MPa
Under, with 2.80~3.20 m of lance ejection3The nitrogen of/t steel min, blows and splashes 3.5~5.0min, all splashes dry stay in stove.
Charging process refers to：It splashes slag to finish, lime is added by 12 ~ 16kg/t steel to furnace bottom, by 6~8kg/t
Light dolomite is added in steel, and converter, which is added, in high phosphorus hot metal and steel scrap waits refining, 1270 DEG C of molten iron temperature ＞.
The primary blowing process refers to：Lower rifle blows into the raw materials for metallurgy and slag charge of stove, and blow 2~3min30s first slags
When starting fusing, point 2~3 batches press 6~10kg/t steel addition lime, and disposably pressing 5kg/t steel after the 4min that blows is added life in vain
Marble；It opens oxygen-blowing gun rifle position to control by 1100mm, blowing 5min process rifle positions are controlled by 1300 ~ 1400mm, rifle after the 7min that blows
Position is controlled by 1200~1600mm, and oxygen pressure is 0.70 ~ 0.80MPa, 2.95 ~ 3.50m of oxygen supply intensity3/ t steel min, once
Duration of blast amounts to 6~8min.
The muck discharging process of falling stove refers to：After primary blowing stops, high phosphorus clinker early period is poured out, the primary liquid steel temperature of falling stove
It is 1550~1600 DEG C.
The secondary charging process refers to：Sinter return fine is added by 5kg/t steel into stove before secondary blowing.
The secondary blowing process refers to：Lower rifle carries out secondary blowing, opens and stone is added by 12~14kg/t steel when blowing 2min
Ash presses 6~8kg/t steel when 4min and unprocessed dolomite is added, again by 8~12kg/t addition light dolomites；When slugging situation is good,
3~4kg/t of sinter return fine is added, when slugging difficulty, 5~6kg/t of sinter return fine is added, opens and blows rifle position and controlled by 1300mm,
Process rifle position is controlled by 1400mm, rifle position is improved when 6min30s ~ 6min40s to 1800mm 28 ~ 35s of slugging, rifle position is pressed after slugging
1400mm is controlled；0.75 ~ 0.85MPa of oxygen pressure, 3.50 ~ 4.00m of oxygen supply intensity3/ t steel min.
The terminal point control with tapping process refer to：The thermometric of falling stove samples after 6~8min of secondary blowing；After stove by 3.0 ~
4.5kg/t steel adds lime, when furnace temperature is 1590~1610 DEG C, unprocessed dolomite 2kg/t is added, when furnace temperature is
At 1610~1630 DEG C, be added unprocessed dolomite 4kg/t, continue dephosphorization heat up 20 ~ 45s, when tap outlet temperature >=1650 DEG C when,
30s controls are blown deeply by rifle position 900mm, if outlet temperature is less than 1650 DEG C, by blowing 0.6 DEG C/s of heating rate is warming up to molten steel temperature deeply
>=1650 DEG C of degree；Lime, the tapping of falling stove, control tapping time >=4.00min is added by 4 ~ 6kg/t steel when blowing end point；Tapping
Finishing slag is stayed to splash slag, repetitive cycling above-mentioned operation entirely again afterwards.
The ingredient and property of the finishing slag are as follows：CaO 35~48%, MgO 8~14%, SiO2 8~13%, TFe 10.20
~18.50%, P2O5 2.50~5.60%, basicity 2.5~6.
The ingredient and property of the unprocessed dolomite are as follows：Lumpiness 30~50mm, CaO 28.0~38.67%, MgO 16.00
~20.00%, SiO2 0.08~0.12%, S 0.010~0.030%, igloss 30~50%.
The stone ash composition and property are as follows：CaO 78.00~91.00%, MgO 2.00~5.00%, activity degree 200
~320.
The ingredient and property of the light dolomite are as follows：Lumpiness 30~50mm, MgO 25.00~32.00%, CaO
20.00 ~ 40.00%, SiO2≤ 4.00%, igloss≤30.00%.
The ingredient and property of the high phosphorus hot metal are as follows：C 3.82 ~ 4.29%, Si 0.33 ~ 0.66%, Mn 0.24 ~
0.34%, P 0.35 ~ 0.65%, S 0.020 ~ 0.050%.
The primary liquid steel temperature of falling stove is 1550~1600 DEG C.
The primary molten steel of falling stove P≤0.060%.
The ingredient and property of the sinter return fine are as follows：TFe 45.00 ~ 50.00%, FeO 10.00 ~ 13.00%, CaO
14.50 ~ 16.33%, SiO26.20 ~ 7.84%, MgO 2.10 ~ 3.20%, P 1.20 ~ 1.50%, 2~5mm of granularity.
The molten steel composition of the tapping of falling stove is as follows：C 0.06 ~ 0.15%, P≤0.028%, S≤0.045%.
The rifle position refers to distance of the oxygen rifle apart from liquid steel level.
Embodiment 1
（1）Smelting and slag making raw material：
The ingredient and property of finishing slag are as follows：CaO 44.90%, MgO 12.20%, SiO2 11.50%, TFe 17.20%, P2O5
3.24%, basicity 2.9.
The ingredient and property of unprocessed dolomite are as follows：Lumpiness 40mm, CaO 34.67%, MgO 18.22%, SiO2 0.10%, S
0.020%, igloss 46%.
Stone ash composition and property are as follows：CaO 89.52%, MgO 3.24%, activity degree 300（Based on 4mol/L hydrochloric acid）.
The ingredient and property of light dolomite are as follows：Lumpiness 35mm, CaO 34.67%, MgO 28.22%, SiO2 1.10%,
Igloss 25%.
The ingredient and property of high phosphorus hot metal are as follows：C 4.12%, Si 0.45%, Mn 0.32%, P 0.42%, S 0.035%.
The ingredient and property of steel scrap are as follows：C 0.18%, Si 0.20%, Mn 1.15%, S0.028%, P 0.032% are maximum
Length 500mm, maximum height 300mm, maximum width 250mm, monolithic maximum weight 600kg.
The ingredient and property of sinter return fine are as follows：TFe 48.79%, FeO 10.31%, CaO 15.33%, SiO27.34%,
MgO 2.91%, P 1.45%, 2~5mm of granularity.
（2）Slag making dephosphorization technology：
A, slag is stayed to splash slag：After tapping, finishing slag is all stayed in stove, 1740 DEG C of in-furnace temperature；Add by 3.5kg/t steel
Enter unprocessed dolomite, under the conditions of the pressure of 0.90MPa and the rifle position of control 1200mm, with 3.10 m of lance ejection3/ t steel min
Nitrogen, blow and splash 4.5min, all splash dry stay in stove.
B, primary charging：It splashes slag to finish, lime is added by 15.5kg/t steel to furnace bottom, be added by 7.5kg/t steel light-burned white
High phosphorus hot metal 128t and steel scrap 11t are added converter and wait refining by marble, 1278 DEG C of molten iron temperature.
C, primary blowing：Lower rifle blows divides 2 into the raw materials for metallurgy and slag charge of stove when blowing 2min45s first slags start fusing
Lime is added by 9kg/t steel in batch, 5kg/t steel is disposably pressed after the 4min that blows, unprocessed dolomite is added；Open oxygen-blowing gun rifle position by
1100mm is controlled, and blowing 5min process rifle positions are controlled by 1300mm, and rifle position is controlled by 1500mm after the 7min that blows, and oxygen pressure is
0.78MPa, oxygen supply intensity 3.40m3/ t steel min, one time duration of blast amounts to 7min40s.
D, the stove that falls is slagged tap：After primary blowing stops, high phosphorus clinker early period is poured out, the primary liquid steel temperature of falling stove is 1590 DEG C,
Molten steel w（P）0.048%.
E, secondary charging：Sinter return fine is added by 5kg/t steel into stove before secondary blowing.
F, secondary blowing：Lower rifle carries out secondary blowing, opens and is added lime by 13kg/t steel when blowing 2min, and when 4min presses again
Unprocessed dolomite is added in 7.5kg/t steel, and light dolomite is added by 11kg/t；Slugging is difficult, returns dry sign, is mended by 6kg/t steel
Add sinter return fine, open and blow rifle position and controlled by 1300mm, process rifle position is controlled by 1400mm, and when 6min40s improves rifle position extremely
1800mm slugging 35s, rifle position is controlled by 1400mm after slugging；0.76 ~ 0.82MPa of oxygen pressure, oxygen supply intensity 3.80 ~
4.00m3/ t steel min.
G, terminal point control and tapping：After secondary blowing 7min55s the thermometric of falling stove sample, 1610 DEG C of liquid steel temperature, molten steel at
Divide C 0.11%, P 0.035%；Lime is added by 3.1kg/t steel after stove, liquid steel temperature is normal, and raw white clouds are added by 2kg/t steel
Stone continues dephosphorization heating 42s, blows 30s controls deeply by rifle position 900mm, measure 1655 DEG C of liquid steel temperature；6kg/ is pressed when blowing end point
Lime, the tapping of falling stove, control tapping time 4min25s is added in t steel；Finishing slag is stayed to splash slag, the above-mentioned work of repetitive cycling after tapping entirely again
Sequence.
Embodiment 2
（1）Smelting and slag making raw material：
The ingredient and property of finishing slag are as follows：CaO 42.50%, MgO 11.50%, SiO2 10.60%, TFe 18.20%, P2O5
4.24%, basicity 4.7.
The ingredient and property of unprocessed dolomite are as follows：Lumpiness 30~50mm, CaO 35.27%, MgO 19.22%, SiO2
0.12%, S 0.025%, igloss 45%.
Stone ash composition and property are as follows：CaO 88.32%, MgO 2.92%, activity degree 320（Based on 4mol/L hydrochloric acid）.
The ingredient and property of light dolomite are as follows：Lumpiness 38mm, CaO 23.67%, MgO 27.82%, SiO2 1.15%,
Igloss 25%.
The ingredient and property of high phosphorus hot metal are as follows：C 3.98%, Si 0.42%, Mn 0.28%, P 0.39%, S 0.032%.
The ingredient and property of steel scrap are as follows：C 0.21%, Si 0.18%, Mn 1.25%, S 0.025%, P 0.028%, it is maximum
Length is less than 500mm, maximum height 350mm, maximum width 250mm, monolithic maximum weight 550kg.
The ingredient and property of sinter return fine are as follows：TFe 47.79%, FeO 11.31%, CaO 15.33%, SiO27.34%,
MgO 2.91%, P 1.29%, 2~5mm of granularity.
（2）Slag making dephosphorization technology：
A, slag is stayed to splash slag：After tapping, finishing slag is all stayed in stove, 1720 DEG C of in-furnace temperature；Add by 3.3kg/t steel
Enter unprocessed dolomite, under the conditions of the pressure of 0.90MPa and the rifle position of control 1300mm, with 3.10 m of lance ejection3/ t steel min
Nitrogen, blow and splash 4min10s, all splash dry stay in stove.
B, primary charging：It splashes slag to finish, lime is added by 14.5kg/t steel to furnace bottom, be added by 7.2kg/t steel light-burned white
High phosphorus hot metal 132t and steel scrap 8t are added converter and wait refining by marble, 1290 DEG C of molten iron temperature.
C, primary blowing：Lower rifle blows divides 2 into the raw materials for metallurgy and slag charge of stove when blowing 3min12s first slags start fusing
Lime is added by 8.5kg/t steel in batch, 5kg/t steel is disposably pressed after the 4min that blows, unprocessed dolomite is added；Open oxygen-blowing gun rifle position by
1100mm is controlled, and blowing 5min process rifle positions are controlled by 1400mm, and rifle position is controlled by 1500mm after the 7min that blows, and oxygen pressure is
0.78MPa, oxygen supply intensity 3.20m3/ t steel min, one time duration of blast amounts to 7min32s.
D, the stove that falls is slagged tap：After primary blowing stops, high phosphorus clinker early period is poured out, the primary liquid steel temperature of falling stove is 1582 DEG C.
Molten steel w（P）0.048%.
E, secondary charging：Sinter return fine is added by 5kg/t steel into stove before secondary blowing.
F, secondary blowing：Lower rifle carries out secondary blowing, opens and is added lime by 12.5kg/t steel when blowing 2min, and when 4min presses again
Unprocessed dolomite is added in 7.52kg/t steel, and light dolomite is added by 10kg/t；Slag fluidity is preferable, is added by 3.5kg/t steel
Sinter return fine is opened and blows rifle position and controlled by 1300mm, and process rifle position is controlled by 1400mm, and when 6min30s improves rifle position to 1800mm
Slugging 28s, rifle position is controlled by 1400mm after slugging；Oxygen pressure 0.78MPa, oxygen supply intensity 3.90m3/ t steel min.
G, terminal point control and tapping：After secondary blowing 7min22s the thermometric of falling stove sample, 1630 DEG C of liquid steel temperature, molten steel at
Divide C 0.09%, P 0.045%；Lime is added by 4.12kg/t steel after stove, liquid steel temperature is higher, is added by 4kg/t steel raw white
Marble continues dephosphorization heating 25s, blows 30s controls deeply by rifle position 900mm, measure 1650 DEG C of liquid steel temperature；It is pressed when blowing end point
Lime, the tapping of falling stove, control tapping time 5min12s is added in 4kg/t steel；Finishing slag is stayed to splash slag after tapping entirely again, in repetitive cycling
State process.
Embodiment 3
（1）Smelting and slag making raw material：
The ingredient and property of finishing slag are as follows：CaO 41.50%, MgO 13.50%, SiO2 10.60%, TFe 17.82%, P2O5
3.56%, basicity 5.6.
The ingredient and property of unprocessed dolomite are as follows：Lumpiness 30~50mm, CaO 34.28%, MgO 18.88%, SiO2
0.11%, S 0.021%, igloss 45.50%.
Stone ash composition and property are as follows：CaO 87.82%, MgO 2.32%, activity degree 310（Based on 4mol/L hydrochloric acid）.
The ingredient and property of light dolomite are as follows：Lumpiness 42mm, CaO 38.67%, MgO 27.82%, SiO2 2.11%,
Igloss 23.%.
The ingredient and property of high phosphorus hot metal are as follows：C 4.28%, Si 0.33%, Mn 0.24%, P 0.45%, S 0.025%.
The ingredient and property of steel scrap are as follows：C 0.20%, Si 0.20%, Mn 0.95%, S 0.028%, P 0.028%, it is maximum
Length is less than 400mm, maximum height 250mm, maximum width 260mm, monolithic maximum weight 450kg.
The ingredient and property of sinter return fine are as follows：TFe 48.79%, FeO 10.31%, CaO 14.50%, SiO26.34%,
MgO 2.91%, P 1.25%, 2~5mm of granularity.
（2）Slag making dephosphorization technology：
A, slag is stayed to splash slag：After tapping, finishing slag is all stayed in stove, 1710 DEG C of in-furnace temperature；Add by 3.2kg/t steel
Enter unprocessed dolomite, under the conditions of the pressure of 0.88MPa and the rifle position of control 1400mm, with 3.20 m of lance ejection3/ t steel min
Nitrogen, blow and splash 4min40s, all splash dry stay in stove.
B, primary charging：It splashes slag to finish, lime is added by 14.10kg/t steel to furnace bottom, be added by 6.8kg/t steel light-burned white
High phosphorus hot metal 125t and steel scrap 11t are added converter and wait refining by marble, 1299 DEG C of molten iron temperature.
C, primary blowing：Lower rifle blows divides 3 into the raw materials for metallurgy and slag charge of stove when blowing 3min8s first slags start fusing
Lime is added by 8.2kg/t steel in batch, 5kg/t steel is disposably pressed after the 4min that blows, unprocessed dolomite is added；Open oxygen-blowing gun rifle position by
1100mm is controlled, and blowing 5min process rifle positions are controlled by 1400mm, and rifle position is controlled by 1500mm after the 7min that blows, and oxygen pressure is
0.79MPa, oxygen supply intensity 3.10m3/ t steel min, one time duration of blast amounts to 7min15s.
D, the stove that falls is slagged tap：After primary blowing stops, high phosphorus clinker early period is poured out, the primary liquid steel temperature of falling stove is 1592 DEG C.
Molten steel w（P）0.060%.
E, secondary charging：Sinter return fine is added by 5kg/t steel into stove before secondary blowing.
F, secondary blowing：Lower rifle carries out secondary blowing, opens and is added lime by 12kg/t steel when blowing 2min, and when 4min presses again
Unprocessed dolomite is added in 6.8kg/t steel, and light dolomite is added by 8kg/t；Slugging situation is preferable, adds sintering by 3kg/t steel and returns
Mine is opened and blows rifle position and controlled by 1300mm, and process rifle position is controlled by 1400mm, and when 6min40s improves rifle position to 1800mm sluggings
28s, rifle position is controlled by 1400mm after slugging；Oxygen pressure 0.79MPa, oxygen supply intensity 3.90m3/ t steel min.
G, terminal point control and tapping：After secondary blowing 7min32s the thermometric of falling stove sample, 1629 DEG C of liquid steel temperature, molten steel at
Divide C 0.15%, P 0.042%；Lime is added by 3.8kg/t steel after stove, liquid steel temperature is higher, and raw white clouds are added by 4kg/t steel
Stone continues dephosphorization heating 32s, blows 30s controls deeply by rifle position 900mm, measure 1660 DEG C of liquid steel temperature；6kg/ is pressed when blowing end point
Lime, the tapping of falling stove, control tapping time 4min22s is added in t steel；Finishing slag is stayed to splash slag, the above-mentioned work of repetitive cycling after tapping entirely again
Sequence.
The operation principle of the present invention：
Slag making dephosphorization technology of the present invention mainly utilizes low price and effectively slugging material and plays good cooling effect
And the application for the slag making furnace retaining material for increasing clinker MgO is had both, global optimization is carried out to smelting process on this basis, reaches suitable
Sharp dephosphorization, protection furnace lining and the purpose for reducing comprehensive slag making cost.It is embodied in：For molten iron in high phosphorus hot metal smelting process
Heat is more than needed, is largely cooled down using active lime and light dolomite, while high price magnesite ball, slagging agent apply rear slag making cost
High problem carries out work from suitable material conditions, thermodynamic condition and dynamic conditions is provided in terms of following five
Skill optimizes：
（1）Deslagging is time-optimized：The deslagging time is poured out by the 4 ~ 6min that blows and is optimized for 6~8min of duration of blast
It pours out, has the sufficient slugging time before ensureing a deslagging, ensure that clinkerization is saturating, improve the utilization rate of slag charge before a deslagging,
Again slag making is smelted, and prevents blowing middle and later periods rephosphorization.
（2）Slag charge structure optimization：Cancel former high price magnesite ball and slagging agent, light-burned white clouds are substituted with part unprocessed dolomite
Stone substitutes slagging agent using self-produced sinter return fine, and the characteristics of according to various slag making materials, stringent formulate is added the time and is added number
Amount.
（3）Temperature control optimization：The primary liquid steel temperature of falling stove control require by 1450~1500 DEG C of raisings to 1550~
1600 DEG C, it is conducive to slugging early period and high efficiency dephosphorating；Once the liquid steel temperature of falling stove reaches 1600~1630 DEG C after deslagging；Tapping
Temperature reaches steel grade target call.
（4）Rifle position control optimization：Primary blowing, which is opened, blows rifle position and is controlled away from liquid level 1100 by being reduced to away from liquid level 1200mm, blows
Refining 2~3min processes rifle position is controlled by being reduced to away from liquid level 1400mm away from liquid level 1300mm；It is secondary blowing open blow rifle position by away from
1600mm is reduced to 1300mm controls, process rifle position to be controlled by 1400mm.
（5）Blowing end point technology controlling and process optimizes：To further decrease finishing slag TFe contents, it is desirable that terminal blows rifle position by deep
900mm blows 30s controls deeply；It is appropriate to reduce slag rephosphorization amount for the clinker for being thickened dilute, it avoids taking away more iron, be blown in converter
Lime appropriate dry slag is added when refining to terminal, rifle must not be descended to blow again after lime is added.
The features of the present invention：
Slag making dephosphorization technology of the present invention is more than needed for traditional converter smelting high phosphorus hot metal heat, slag making is of high cost asks
Topic carries out global optimization, rationally using the sinter return fine of cheap environmental protection to the smelting process in high phosphorus hot metal converter smelting each stage
And unprocessed dolomite, the slag making furnace retaining dephosphorization materials such as high price slagging agent, magnesite ball, light dolomite are partially and fully substituted, are formulated
Rational addition quantity and opportunity is added, and formulates corresponding process system.Make full use of physical thermal and the change of high phosphorus hot metal
Heat is learned, the addition of high price slag making materials is reduced while reaching dephosphorization, richness is balanced while ensureing smooth dephosphorization
Remaining heat, slag beneficiation,（P2O5）And finishing slag（MgO）Content increases, and is protecting furnace lining and is reaching dephosphorization effect
Comprehensive slag making cost is reduced simultaneously, and ton steel integrates 8 yuan/t or more of slag making cost reduction.
Claims (6)
1. a kind of inexpensive slag making dephosphorization technology of converter smelting high phosphorus hot metal, it is characterised in that including staying slag to splash slag, once adding
Material, primary blowing, the stove that falls slag tap, secondary charging, secondary blowing and the tapping of falling stove process, specifically include：
A, slag is stayed to splash slag：After tapping, finishing slag is all stayed in stove, 1710 ~ 1760 DEG C of in-furnace temperature；By 3 ~ 4kg/t steel
Unprocessed dolomite is added, under the conditions of the pressure of 0.78 ~ 0.95MPa and the rifle position of control 800mm ~ 1400mm, uses lance ejection
2.80~3.20m3The nitrogen of/t steel min, blows and splashes 3.5 ~ 5.0min, all splashes dry stay in stove；
B, primary charging：It splashes slag to finish, lime is added by 12 ~ 16kg/t steel to furnace bottom, light-burned white clouds are added by 6 ~ 8kg/t steel
High phosphorus hot metal and steel scrap are added converter and wait refining by stone, 1270 DEG C of molten iron temperature ＞；
C, primary blowing：Lower rifle blows into the raw materials for metallurgy and slag charge of stove, when blowing 2min ~ 3min30s first slags start fusing, point
Lime is added by 6 ~ 10kg/t steel in 2 ~ 3 batches, 5kg/t steel is disposably pressed after the 4min that blows, unprocessed dolomite is added；Open oxygen-blowing gun rifle
Position is controlled by 1100mm, and blowing 5min process rifle positions are controlled by 1300 ~ 1400mm, and rifle position presses 1200 ~ 1600mm after the 7min that blows
Control, oxygen pressure are 0.70 ~ 0.80MPa, 2.95 ~ 3.50m of oxygen supply intensity3/ t steel min, a duration of blast total 6 ~
8min；
D, the stove that falls is slagged tap：After primary blowing stops, high phosphorus clinker early period is poured out, the primary liquid steel temperature of falling stove is 1550 ~ 1600 DEG C,
P≤0.060%；
E, secondary charging：Sinter return fine is added by 5kg/t steel into stove before secondary blowing；
F, secondary blowing：Lower rifle carries out secondary blowing, opens and is added lime by 12 ~ 14kg/t steel when blowing 2min, and when 4min presses 6 again ~
Unprocessed dolomite is added in 8kg/t steel, and light dolomite is added by 8 ~ 12kg/t；When slugging situation is good, addition sinter return fine 3 ~
5 ~ 6kg/t of sinter return fine is added when slugging difficulty in 4kg/t, opens and blows rifle position and controlled by 1300mm, and process rifle position presses 1400mm
Control improves rifle position when 6min30s ~ 6min40s to 1800mm 28 ~ 35s of slugging, and rifle position is by 1400mm controls after slugging；Oxygen
0.75 ~ 0.85MPa of pressure, 3.50 ~ 4.00m of oxygen supply intensity3/ t steel min；
Step E, TFe 45.00 ~ 50.00% in sinter return fine described in F, FeO 10.00 ~ 13.00%, CaO 14.50 ~ 16.33%,
SiO26.20 ~ 7.84%, MgO 2.10 ~ 3.20%, P 1.20 ~ 1.50%, 2 ~ 5mm of granularity；
G, terminal point control and tapping：The thermometric of falling stove samples after 6 ~ 8min of secondary blowing；Stone is added by 3.0 ~ 4.5kg/t steel after stove
Unprocessed dolomite 2kg/t is added when furnace temperature is 1590 ~ 1610 DEG C in ash, when furnace temperature is 1610 ~ 1630 DEG C, is added
Unprocessed dolomite 4kg/t, continue dephosphorization heat up 20 ~ 45s, when tap outlet temperature >=1650 DEG C when, blow 30s deeply by rifle position 900mm
Control, if outlet temperature is less than 1650 DEG C, by blowing 0.6 DEG C/s of heating rate is warming up to liquid steel temperature >=1650 DEG C deeply；Blowing is eventually
Lime, the tapping of falling stove, control tapping time >=4.00min is added by 4 ~ 6kg/t steel when point；Finishing slag is stayed to splash slag entirely again after tapping,
Above-mentioned A ~ G the processes of repetitive cycling；
Final slag composition and property are as follows：CaO 35 ~ 48%, MgO 11.50 ~ 14%, SiO2 8 ~ 13%, TFe 10.20 ~ 18.50%,
P2O5 2.50 ~ 5.60%, basicity 2.5 ~ 6.
2. slag making dephosphorization technology according to claim 1, it is characterised in that the unprocessed dolomite ingredient and property are as follows：Lumpiness
30 ~ 50mm, CaO 28.0 ~ 38.67%, MgO 16.00 ~ 20.00%, SiO2 0.08 ~ 0.12%, S 0.010 ~ 0.030%, igloss 30
~50%。
3. slag making dephosphorization technology according to claim 1, it is characterised in that the lime ingredient and property are as follows：CaO
78.00 ~ 91.00%, MgO 2.00 ~ 5.00%, activity degree 200 ~ 320.
4. slag making dephosphorization technology according to claim 1, it is characterised in that the light dolomite ingredient and property are as follows：Block
Spend 30 ~ 50mm, MgO 25.00 ~ 32.00%, CaO 20.00 ~ 40.00%, SiO2≤ 4.00%, igloss≤30.00%.
5. slag making dephosphorization technology according to claim 1, it is characterised in that the high phosphorus hot metal ingredient and property are as follows：C
3.82 ~ 4.29%, Si 0.33 ~ 0.66%, Mn 0.24 ~ 0.34%, P 0.35 ~ 0.65%, S 0.020 ~ 0.050%.
6. slag making dephosphorization technology according to claim 1, it is characterised in that the molten steel composition of the tapping of falling stove is as follows：C
0.06 ~ 0.15%, P≤0.028%, S≤0.045%.
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| CN108165699B (en) * | 2017-12-25 | 2020-09-04 | 马鞍山钢铁股份有限公司 | Operation method for converter temperature control slagging |
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| CN109161635B (en) * | 2018-09-30 | 2020-04-10 | 武钢集团昆明钢铁股份有限公司 | Preparation method for extracting carbon and protecting manganese by converter smelting high-manganese high-sulfur high-phosphorus iron water |
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| CN109652606B (en) * | 2019-01-23 | 2021-01-26 | 山东钢铁股份有限公司 | Low-calorific-value molten iron converter smelting method |
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| CN112522475B (en) * | 2020-11-11 | 2022-11-08 | 冷水江钢铁有限责任公司 | Method for improving desulfurization efficiency in converter |
| CN114480774A (en) * | 2021-12-23 | 2022-05-13 | 武钢集团昆明钢铁股份有限公司 | Method for smelting high-phosphorus molten iron by adopting limestone slagging process in converter |
| CN114410878B (en) * | 2021-12-23 | 2023-05-19 | 武钢集团昆明钢铁股份有限公司 | Converter molten iron smelting method adopting large-particle limestone to replace full-quantity lime slag formation |
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| CN103060512B (en) * | 2013-02-07 | 2014-04-02 | 武钢集团昆明钢铁股份有限公司 | Dephosphorizing and steelmaking method of medium-high-phosphorous semisteel by top-blown converter |
| CN103509907B (en) * | 2013-10-25 | 2015-11-18 | 武汉钢铁(集团)公司 | Join the method for magnesium slag making with unprocessed dolomite in a kind of Blowing Converter |
| CN104263875B (en) * | 2014-09-15 | 2016-03-02 | 首钢总公司 | A kind of top blown converter adopts high phosphorus hot metal to produce the dephosphorizing method of alloy bonding wire steel |
| CN104726645A (en) * | 2015-04-10 | 2015-06-24 | 武钢集团昆明钢铁股份有限公司 | Dephosphorization method of mid-high phosphorus semisteel |
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