CN110373511A - A kind of converter smelting process of low lime consumption - Google Patents
A kind of converter smelting process of low lime consumption Download PDFInfo
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- CN110373511A CN110373511A CN201910645672.0A CN201910645672A CN110373511A CN 110373511 A CN110373511 A CN 110373511A CN 201910645672 A CN201910645672 A CN 201910645672A CN 110373511 A CN110373511 A CN 110373511A
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- slag
- converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- 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
- C21C5/35—Blowing from above and through the bath
-
- 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
-
- 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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- 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
-
- 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
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
A kind of converter smelting process of low lime consumption of the present invention, before converter tapping, according to P in vessel slag2O5Content leaves and takes part finishing slag；Deoxidier is added according to FeO content in slag after tapping, reduces slag beneficiation；Whole light dolomites needed for the dephosphorization phase is added carry out slag splashing operation, steel scrap are first added, whole lime needed for the dephosphorization phase then is added；Molten iron is blended into after the completion of lime addition, drop oxygen rifle igniting, addition is returned mine after igniting or ore adjusts slag composition；After dephosphorization time, carbon content, temperature reach requirement, the slag operation of falling dephosphorization is carried out；After the completion of slag, secondary drop oxygen rifle igniting is carried out, and control feeding quantity by basicity requirement；Oxygen feeding stop after carbon, temperature are met the requirements, and according to P in finishing slag2O5Mass percentage leaves and takes part finishing slag, smelts for next furnace.Present invention reduces lime consumptions, reduce the converter quantity of slag and steel technology, avoid the enrichment, rephosphorization of phosphorus and dry method dust venting of dust explosion problem in clinker.
Description
Technical field
The invention belongs to Ferrous Metallurgy converter steeling technology fields, and in particular to a kind of converter smelting work of low lime consumption
Skill.
Technical background
The main ingredient of lime is CaO, is the main slag making materials of steel-making, has dephosphorization, desulphurizing ability, and steel-making is used
Measure most slag making materials.In pneumatic steelmaking production, the rising of lime consumption will cause the increase of the converter smelting quantity of slag, into
And iron loss, steel technology is caused to increase, converter producing increased costs, therefore it is always each iron and steel enterprise that low lime consumption, which is smelted,
The emphasis of concern；Especially in recent years, with the increase of environmental protection pressure, lime consumption is reduced, reduces environmental pollution and is produced with enterprise
Cost more becomes focus concerned by people.
To reduce converter lime consumption, lime quality, molten iron pretreatment, converter process operation optimization etc. are improving in each enterprise
Aspect takes certain measure, also achieves corresponding effect.Such as: a kind of patent " converter operation of lime stone low phosphorus steel by smelting
Method " (201410320701.3) disclose it is a kind of using replacing lime with limestone in converter smelting method, this method avoids
Lime calcining bring environmental pollution improves lime utilization rate, but this method will lead to the increase of the converter quantity of slag, and iron and steel stock disappears
Consumption increases, and this method is more demanding to converter heat affluence degree, is unfavorable for the raising of converter scrap ratio；" converter uses patent
Corundum slag progress double slag process smelting method " (201611044136.8) disclose it is a kind of using corundum slag replace part lime side
Method reduces lime consumption, although this method can reduce part lime consumption, the Al contained in this method2O3It will lead to converter
Lining wear speed is accelerated, and fettling number increases, and influences the production direct motion of converter；Patent " a kind of method of the double slag steel-making of converter "
(201410277535.3) disclose a kind of method for lowering converter lime under the conditions of half steel, this method carbon content 0.8% ~
Carry out down slag when between 1.2%, then carry out slag making smelting again, but this method in secondary slag making since content is too low, will lead to
The heating of converter later period is difficult, and does not control secondary venting of dust explosion problem, will lead to the increase of converter venting of dust explosion number, influences to produce suitable
Row；Patent " method for making steel that a kind of double slags of semi-steel making stay slag " (201210544071.9) is although it is contemplated that the weight of converter finishing slag
Quantity of slag problem is utilized and stays again, but enrichment for phosphorus in vessel slag and converter detailed process early period state modulator be there are mistaken ideas,
Cause converter dephosphorization efficiency bad, it is little that lime consumption saves amplitude, and does not account for converter venting of dust explosion problem；Patent is " a kind of high
Imitate the technology method of inexpensive producing ultra-low phosphorous steel by converter water " (201210020934.2) though propose double slag melting works
Skill, but specific smelting process early period control system is not refined, it is unfavorable for guidance operation；Patent be " low lime consumption
The method that converter steel making method " (201410026518.2) equally also proposed remained converter slag operation, but to the phosphorus stayed in slag
Enrichment problem and detailed process operation are not provided and are illustrated, and the technique is caused to be difficult to be embodied.
In the prior art, not yet discovery can be from staying the sides such as the quantity of slag, blowing operating process, dephosphorization efficiency and continuous production
The converter smelting process for the low lime consumption that face is comprehensively considered, therefore, it is necessary in conjunction with entire converter production process, exploitation
A kind of converter smelting process can reduce lime consumption.
Summary of the invention
The purpose of the present invention is to provide a kind of converter smelting process of low lime consumption, the technique is from remained converter slag, smelting
Refining operation, dephosphorization efficiency, continuous production etc. are comprehensively considered, and are not only reduced lime consumption, are also reduced converter
The quantity of slag and steel technology, while the enrichment, rephosphorization of phosphorus and dry method dust venting of dust explosion problem in clinker are also avoided, it ensure that life
The continuity of production.In addition, the technique can also effectively slow down lining wear, guarantee the production direct motion of converter.
Technical solution of the present invention main flow the following steps are included:
(1) before converter tapping, according to P in vessel slag2O5Mass percentage leaves and takes part finishing slag；
(2) after converter tapping, deoxidier is added according to FeO mass percentage situation in slag, reduces slag beneficiation；
(3) whole light dolomites needed for the dephosphorization phase being added carry out slag splashing operation, and guarantee furnace after the completion of slag splashing
Slag all solidifies；
(4) steel scrap is first added, whole lime needed for the dephosphorization phase then is added；
(5) after the completion of lime is added, start to be blended into molten iron, it is uniform, stable that range request is crossed in iron making；
(6) drop oxygen rifle igniting, addition is returned mine after igniting or ore adjusts slag composition；
(7) after dephosphorization time, carbon content, temperature reach requirement, the slag operation of falling dephosphorization is carried out；
(8) it falls after the completion of slag, carries out secondary drop oxygen rifle igniting, and control feeding quantity by basicity requirement；
(9) oxygen feeding stop after carbon, temperature are met the requirements, and according to P in finishing slag2O5Mass percentage leaves and takes part finishing slag,
It is smelted for next furnace.
A kind of converter smelting process of above-mentioned low lime consumption, in the step (1), remained converter slag amount is according to P in slag2O5
Mass percentage λ controlled: as λ≤2.0w%, 50kg/t steel < stays the quantity of slag≤60kg/t steel；When 2.0w% < λ≤
When 2.5w%, 30kg/t steel < stays the quantity of slag≤50kg/t steel；As 2.5w% < λ, 20kg/t steel≤stay the quantity of slag≤30kg/t steel, this
Invention is using the stability contorting for first staying the method tapped after slag to be conducive to remained converter slag amount.
A kind of converter smelting process of above-mentioned low lime consumption, in the step (2), deoxidier additional amount presses following technique
Control: as 15 wt % of FeO mass percentage > in slag, 1 wt % of the every increase of FeO mass percentage, deoxidier in slag
Additional amount increase accordingly 1.5kg/tSlag。
A kind of converter smelting process of above-mentioned low lime consumption, in the step (3), when slag splashing, only adds light-burned white clouds
Stone, light dolomite additional amount is according to staying the requirement of MgO mass percentage in the quantity of slag and dephosphorization phase slag to be determined, the dephosphorization phase
MgO mass percentage requires control between 5 wt % ~ 6wt% in slag, does not add light dolomite after oxygen rifle igniting.
A kind of converter smelting process of above-mentioned low lime consumption, in the step (4), adding amount of scrap steel will be according to will smelt
The molten iron temperature T of heat is determined, when entering furnace molten iron temperature T≤1300 DEG C, it is 8% ~ 10% that steel scrap, which is packed into ratio, when entering furnace molten iron
For temperature at 1300 DEG C of T≤1380 DEG C <, it is 11% ~ 13% that steel scrap, which is transferred to ratio, when entering furnace molten iron temperature at 1380 DEG C of T >,
Steel scrap additional proportion is controlled by 14% ~ 15%；After the completion of steel scrap is added, fascinates respectively 75 ° ~ 85 ° before and after converter, keep steel scrap equal
It is even to pave in furnace bottom.
A kind of converter smelting process of above-mentioned low lime consumption, in the step (4), lime is mainly the small activity degree of granularity
High granule lime, the granularity of lime is between 5mm ~ 15mm, effective CaO content 86%, MgO:5-10%, SiO2:0-5%,
Between S:0-0.05%, activity degree 350ml ~ 380ml；Lime adding amount is according to the content of P, remained converter slag amount and dephosphorization in molten iron
The control of phase clinker dual alkalinity R requires to be controlled, and when P content in molten iron≤0.07%, dephosphorization phase lime dual alkalinity is pressed
1.2≤R≤1.4 are controlled；When the P content in 0.07 < molten iron≤0.12%, dephosphorization lime dual alkalinity by 1.4 < R≤
1.8 are controlled；As molten iron phosphorus P content > 0.12%, dephosphorization lime dual alkalinity is controlled by 1.8 R≤2.0 <.
A kind of converter smelting process of above-mentioned low lime consumption, in the step (5), molten iron be blended into speed be 30t/min ~
40tmin, iron making process make every effort to steady, uniform.
A kind of converter smelting process of above-mentioned low lime consumption, in the step (6), after igniting, preceding 90s uses low rifle position
Blowing, oxygen lance nozzle are promoted to molten steel face 1.81m ~ 2.2m, entire dephosphorization phase oxygen according to spray head after molten steel face 1.2m ~ 1.8m, 90s
Oxygen supply intensity is between 1.8m3/t min ~ 2.2m3/t min, and the 28 ~ 32% of dephosphorization phase oxygen-supplying amount Zhan total oxygen-supplying amount, duration of blast
It controls between 420s ~ 450s；The intensity of bottom blowing nitrogen or argon gas is in 0.075m3/t▪min~0.3m3Between/t min.
A kind of converter smelting process of above-mentioned low lime consumption, in the step (6), first is returned mine or ore is in oxygen rifle
Be added in preceding 30s after igniting, additional amount is the 5% ~ 10% of dephosphorization phase total quantity of slag, second batch return mine or ore igniting 320s ~
It is added when 350s, additional amount is the 4% ~ 8% of dephosphorized slag total amount；The control of FeO content is between 20 ~ 25% in dephosphorization phase slag.
A kind of converter smelting process of above-mentioned low lime consumption, in the step (7), the control of time dephosphorization phase 420s ~
Between 450s, carbon mass percentage is controlled between 3.2w% ~ 3.6w%, and temperature presses following technology controlling and process: when clinker two
In 1.2≤R≤1.4, dephosphorization phase temperature is controlled first basicity by 1340 DEG C≤T≤1360 DEG C；When clinker dual alkalinity exists
When 1.4 < R≤1.8, dephosphorization phase temperature is controlled by 1360 DEG C of T≤1380 DEG C <；When clinker dual alkalinity 1.8 < R≤
When 2.0, dephosphorization phase temperature is controlled by 1380 DEG C of T≤1420 DEG C <.80 ° ~ 92 ° of converter inclining of the when of falling slag, pours out 70% or more
Dephosphorized slag.
A kind of converter smelting process of above-mentioned low lime consumption in the step (8), shakes straight converter after the completion of slag, opens
The decline oxygen rifle that begins is opened and is blown, and opening oxygen lance nozzle when blowing, away from 1.2 ~ 1.8m of liquid level, oxygen flow is the 50% of normal discharge, and 2s after igniting ~
Oxygen rifle promotes 0.2m ~ 0.4m in 5s, and oxygen rifle is then down to original position in 5s ~ 15s again, opens when blowing 30s ~ 40s, start with 5 ~
7m3/ min uniformly increases oxygen flow to normal discharge, and oxygen flow climbs time control between 30s ~ 40s, oxygen flow
After normal between oxygen supply intensity 3.0m3/t min ~ 3.5m3/t min, bottom blowing intensity is in 0.05m3/t min ~ 0.1m3/t min；
Start multiple batches of addition lime, light dolomite after igniting, blow, light dolomite additional amount is 8 ~ 15kg/t steel, is protected
Content of MgO is demonstrate,proved in slag between 8% ~ 10%, lime adding amount in 10/t steel ~ 18kg/t steel, guarantee basicity of slag 3.0 ~ 3.5 it
Between, and be added according to molten steel in the stove temperature and returned mine or ore in right amount, it is ensured that FeO content is between 15% ~ 18% in slag；The grain of lime
Degree is between 20mm ~ 30mm, effective CaO content 88%, MgO:5-10%, SiO2:0-5%, S:0-0.05%, activity degree
Between 300ml ~ 320ml；
The converter smelting process of above-mentioned a kind of low lime consumption, in the step (9), when converter terminal carbon is 0.03% ~ 0.08%
Between, temperature between 1620 DEG C ~ 1640 DEG C when, oxygen feeding stop, and according to P in finishing slag2O5Content leaves and takes part finishing slag, is used for
Next furnace is smelted.
Theoretical basis of the invention:
The key of the low lime consumption smelting process of converter is to promote the utilization efficiency of lime in vessel slag, and the present invention is blown according to converter
Refining requires, and lime has been carried out classification and has been used, and has taken full advantage of the different advantage of Phosphorus Capacity of Slag under condition of different temperatures, and
In conjunction with the technical requirements of dephosphorization, rephosphorization, the related converter blowing process under the conditions of low lime consumption is had studied.
The present invention stays the control of the quantity of slag according to P in slag2O5Content and dephosphorization efficiency early period are determined, primarily to keeping away
Exempt from the rephosphorization problem of dephosphorization phase vessel slag, the research of the invention finds that, under identical FeO content, converter slag basicity is lower, time
Phosphorus temperature is lower, to guarantee that the converter dephosphorization efficiency under low lime consumption, the present invention are imitated according to molten iron phosphorus content and dephosphorization early period
Rate has formulated grading control basicity, dephosphorization temperature early period and the method for reducing phosphorus content in slag.
The present invention is to the purpose that FeO mass percentage is controlled in finishing slag primarily to preventing slag beneficiation mistake
By force, it is unfavorable for slag splashing, it is serious to lining wear and prevent expulsion problem during iron making.Meanwhile to guarantee dephosphorization
FeO mass percentage in slag is not down to too low by the effective content of initial stage FeO, the present invention, and is controlled at 14w% ~ 18w%
Between, in practice it has proved that this temperature range not only can guarantee slag splashing effect but also can prevent the splash during iron making, and early period is de-
Phosphorus effect is preferable.
Light dolomite is added during slag splashing of the present invention on the one hand in order to solidify clinker, on the other hand in order to make furnace
MgO in lining containing certain content protects furnace lining, why controls between 5% ~ 6%, is primarily due to MgO mass percentage
Increase can be such that slag viscosity increases, and be unfavorable for slag fluidity control.According to field practice, since temperature early period is low, 5w% ~ 6w%
Content of MgO can not only prevent lining wear, also make clinker have good mobility.
The present invention using first plus steel scrap, then plus lime avoided previous first plus after lime plus useless finally to the technique of molten iron
The problem of lime is completely melt under the technique of steel, the process makes full use physical thermal of molten iron ensure that the completely molten of lime
Change, creates advantage for dephosphorization early period.
Lime needed for early period and light-burned whole are added the present invention before ignition, premised on slag it is quick formation create item
Part ensure that dephosphorization time, oxygen supply system of the invention and bottom blowing system, be for guaranteeing dephosphorization early period time and lime benefit
It is maximized with efficiency.
Beneficial effects of the present invention:
The present invention takes full advantage of CaO content in converter finishing slag, FeO content height, the good feature of pre- fusibleness, and considers in finishing slag
The enrichment rephosphorization problem of phosphorus is not needed to increase special installation using this method, the lime in vessel slag can be made to be fully used,
Converter lime consumption can reduce 30% or more, and light dolomite consumption reduces 35% or more, and steel technology reduces 5kg/t or more,
The comprehensive dephosphorization rate of converter is up to 90% or more, while this method also effectively prevents converter venting of dust explosion problem, ensure that production direct motion, tool
There is great social and economic benefit.
Specific embodiment
It is practical below in conjunction with 120t converter producing, specific implementation process of the invention is further described:
A furnace slag composition and hot metal composition are shown in Table 1, table 2. in converter in example 1-3
1 converter final slag composition (weight percentage) of table
Table 2 enters furnace hot metal composition
Example 1
Specific step is as follows:
(1) according to P in converter finishing slag2O5Ingredient (being shown in Table 1# slag specimen in 1), determine the furnace stay the quantity of slag be 60kg/t steel, pour out
It taps after respective slag；
(2) due in the heat slag FeO percentage composition be 14.96%, do not needed after tapping plus the deoxidiers such as nut coke, according to staying slag
Content of MgO 5.0w% control requires in amount and dephosphorization phase slag, and the light dolomite that 550kg is added carries out slag splashing, splashes slag process
In ensure that finishing slag is splashed completely in furnace lining inner wall, and ensure that all finishing slags are fully cured；
(3) it is 1286 DEG C (1# molten iron sample in table 2) that the furnace, which corresponds to molten iron temperature, steel scrap 12t is added, always the amount of enclosing is for converter
150t, scrap ratio 8%, 75 ° of tilting converter respectively of front and back, make steel scrap uniformly pave in furnace bottom after steel scrap is added.
(4) it is 1# molten iron sample in 0.056w%(table 2 that the furnace, which corresponds to molten iron phosphorus content), early period, dephosphorization basicity was controlled by 1.2
700kg lime is added according to the quantity of slag is stayed in system after calculating, the granularity of lime is between 5mm ~ 15mm, effective CaO content 86%,
MgO:7%, SiO2:3%, S:0.05%, activity degree 370ml.
(5) it is blended into 138t molten iron, iron making speed 30t steel/min, converter iron making process is made every effort to uniform, stablized, and converter is avoided
Splash keeps bottom-blowing of converter in the open state during iron making.
(6) after the completion of iron making, starting to drop oxygen rifle blowing and strong bottom blowing stirring, after igniting, preceding 90s is blown using low rifle position,
Oxygen lance nozzle is promoted to molten steel face 1.8m according to spray head after molten steel face 1.6m, 90s, and entire dephosphorization phase oxygen oxygen supply intensity is 1.9m3/
T min, the intensity of argon bottom-blowing are 0.075m3/t▪min。
(7) first is added in the preceding 30s after oxygen rifle igniting to return mine or ore, when additional amount 500kg, 320s is added
Second batch is returned mine or ore, additional amount 700kg.The control of FeO content is 20% or so in dephosphorized slag.
(8) when blowing is to 420s, converter carbon content is 3.6%, blowing oxygen quantity 1900m3, early period, 1340 DEG C of temperature level, mentioned
Rise oxygen rifle, 87 ° of converter inclining pour out 70% or more dephosphorized slag.
(9) it falls after the completion of slag, shakes straight converter, decline oxygen rifle, which is opened, blows, and opens when blowing oxygen rifle pipette tips away from liquid level 1.6m, oxygen flow
For 200m3It is down to original position after/min, the rapidly lifted up 0.2m of oxygen rifle in 2s after igniting, 5s, opens and starts when blowing 30s with 5m3/min
Rate uniform increase oxygen flow, open after blowing 70s, oxygen flow reach normal value 400m3/ min, oxygen supply by lance intensity are
3.45m3/ t mi, bottom blowing intensity 0.05m3/t▪min。
(10) multiple batches of addition lime and light dolomite, lime adding amount 1.7t, lime granularity exist after regnition
Between 20mm ~ 30mm, effective CaO content 88%, MgO:10%, SiO2:3%, S:0.05%, activity degree 320ml；Light-burned addition
1.5t is measured, ore additional amount 1.3t, converter finishing slag basicity 3.1, FeO content is 17.5% in slag.
(11) when carbon content is 0.08%, outlet temperature mentions rifle oxygen feeding stop at 1620 DEG C, pours out part finishing slag, starts
Tapping carries out next heat smelting after the completion of tapping.
Phosphorus content is 0.005% in the heat final steel, dephosphorization rate 91.07%, and comprehensive lime consumption is 17.1kg/ steel,
Light dolomite consumption is 14.6kg/t steel, reduces 32% and 37%, steel technology respectively compared to conventional smelting lime, dolomite
Reduce 5.2kg/t.
Example 2
Specific step is as follows:
(1) according to P in converter finishing slag2O5Ingredient (being shown in Table 2# slag specimen in 1), determine the furnace stay the quantity of slag be 51kg/t steel, pour out
It taps after respective slag；
(2) due in the heat slag FeO percentage composition be 20.36%, after tapping plus nut coke 50kg, according to staying the quantity of slag and dephosphorization phase
Content of MgO 5.5w% control requires in slag, and the light dolomite that 600kg is added carries out slag splashing, and splash slag ensures finishing slag in the process
It is splashed completely in furnace lining inner wall, and ensures that all finishing slags are fully cured；
(3) it is 1300 DEG C (2# molten iron sample in table 2) that the furnace, which corresponds to molten iron temperature, steel scrap 15t is added, always the amount of enclosing is for converter
150t, scrap ratio 10%, 80 ° of tilting converter respectively of front and back, make steel scrap uniformly pave in furnace bottom after steel scrap is added.
(4) it is 2# molten iron sample in 0.07w%(table 2 that the furnace, which corresponds to molten iron phosphorus content), early period, dephosphorization basicity was controlled by 1.4
850kg lime is added according to the quantity of slag is stayed in system after calculating, the granularity of lime is between 5mm ~ 15mm, effective CaO content 86%,
MgO:7%, SiO2:3%, S:0.05%, activity degree 370ml.
(5) it is blended into 135t molten iron, iron making speed 30t steel/min makes every effort to uniform, stable in converter iron making process, avoids turning
Furnace splash keeps bottom blowing in the open state during iron making.
(6) after the completion of during iron making, start to drop oxygen rifle blowing and strong bottom blowing stirring, after igniting, preceding 90s uses low rifle position
Blowing, oxygen lance nozzle are promoted to molten steel face 1.7m according to spray head after molten steel face 1.5m, 90s, and entire dephosphorization phase oxygen oxygen supply intensity is
1.8m3/ t min, the intensity of argon bottom-blowing are 0.1m3/t▪min。
(7) first is added in the preceding 30s after oxygen rifle igniting to return mine or ore, when additional amount 550kg, 320s is added
Second batch is returned mine or ore, additional amount 650kg.FeO content is 20% in dephosphorized slag.
(8) when blowing is to 440s, converter carbon content is 3.55%, blowing oxygen quantity 1950m3, early period 1360 DEG C of temperature level,
Lift oxygen rifle, 87 ° of converter inclining pour out 70% or more dephosphorized slag.
(9) it falls after the completion of slag, shakes straight converter, decline oxygen rifle, which is opened, blows, and opens when blowing oxygen rifle pipette tips away from liquid level 1.5m, oxygen flow
For 200m3It is down to original position after/min, the rapidly lifted up 0.2m of oxygen rifle in 5s after igniting, 10s, opens and starts when blowing 30s with 5m3/
The rate uniform of min increases oxygen flow, opens after blowing 70s, and oxygen flow reaches normal value 400m3/ min, oxygen supply by lance intensity are
3.45m3/ t mi, bottom blowing intensity 0.06m3/t▪min。
(10) multiple batches of addition lime and light dolomite, lime adding amount 1.9t, lime granularity exist after regnition
Between 20mm ~ 30mm, effective CaO content 88%, MgO:10%, SiO2:3%, S:0.05%, activity degree 320ml；Light-burned addition
1.4t is measured, ore additional amount 1.5t, converter finishing slag basicity 3.2, FeO content is 19.5% in slag.
(11) when carbon content is 0.05%, outlet temperature mentions rifle oxygen feeding stop at 1625 DEG C, pours out part finishing slag, starts
Tapping carries out next heat smelting after the completion of tapping.
Phosphorus content is 0.006% in the heat final steel, dephosphorization rate 91.4%, and comprehensive lime consumption is 19.6kg/ steel, gently
Calcined dolomite consumption is 14.3kg/t steel, reduces 30% and 39.9%, steel technology respectively compared to conventional smelting lime, dolomite
Reduce 5.1kg/t.
Example 3
Specific step is as follows:
(1) according to converter final slag composition (being shown in Table 3# slag specimen in 1), determining that the furnace stays the quantity of slag is 50kg/t steel, pours out respective slag
After tap.
(2) due in slag FeO content be 24.63%, content is higher, to prevent lining wear and iron making splash, contains by FeO
The requirement of carbon dust 1.5kg/t slag need to be added by measuring every reduction by 1%, and 88kg nut coke is added.
(3) according to staying content of MgO 5.5w% control in the quantity of slag and dephosphorization phase slag to require, the light-burned white clouds of 600kg are directly added into
Stone carries out slag splashing, and splashing slag ensures that finishing slag is splashed completely in furnace lining inner wall in the process, and ensures that all finishing slags are fully cured；
(4) steel scrap is added according to molten iron temperature (3# molten iron sample in table 2), adding amount of scrap steel 16.5t, always the amount of enclosing is for converter
150t, scrap ratio 11%, 80 ° of tilting converter respectively of front and back, make steel scrap uniformly pave in furnace bottom after steel scrap is added.
(5) according to molten iron phosphorus content (3# molten iron sample in table 2), early period, dephosphorization basicity was controlled by 1.5, in conjunction with staying the quantity of slag
After calculating, 800kg lime is added, the granularity of lime is between 5mm ~ 15mm, effective CaO content 86%, MgO:4%, SiO2:
3%, S:0.05%, activity degree 375ml.
(6) 133.5t molten iron, iron making speed 35t/min is added, converter iron making process is made every effort to uniform, stablized, and converter is avoided
Splash keeps bottom blowing in the open state, accelerates melting bath stirring during iron making, promotes lime fusing, prevents lime from gluing furnace bottom.
(7) after the completion of iron making, start to drop oxygen rifle blowing and reinforce bottom blowing stirring, after igniting, preceding 90s is blown using low rifle position
Refining, oxygen lance nozzle are promoted to molten steel face 1.9m according to spray head after molten steel face 1.6m, 90s, and entire dephosphorization phase oxygen oxygen supply intensity is
2.0m3/ t min, the intensity of argon bottom-blowing are 0.10m3/t▪min。
(8) first is added in the preceding 30s after oxygen rifle igniting to return mine or ore, when additional amount 600kg, 330s is added
Second batch is returned mine or ore, additional amount 500kg.Controlling FeO content finally is 22.5%.
(9) when blowing is to 430s, converter carbon content is 3.45%, blowing oxygen quantity 2050m3, early period 1365 DEG C of temperature level,
Lift oxygen rifle, 85 ° of converter inclining pour out 70% or more dephosphorized slag.
(10) it falls after the completion of slag, shakes straight converter, decline oxygen rifle, which is opened, blows, and opens when blowing oxygen rifle pipette tips away from liquid level 1.7m, oxygen stream
Amount is 200m3/ min, oxygen rifle promotes rapidly 0.2m in 3s after igniting, is down to original position again after 5s, opens and blows 30s and start with 6m3/ min's
Rate increases oxygen flow, opens after blowing 65s, and oxygen flow reaches normal value 400m3/ min, oxygen supply by lance intensity are 3.5m3/ t mi,
Bottom blowing intensity is 0.07m3/t▪min。
(11) multiple batches of addition lime and light dolomite, lime adding amount 2.3t, lime granularity exist after regnition
Between 20mm ~ 30mm, effective CaO content 88%, MgO:10%, SiO2:3%, S:0.05%, activity degree 330ml；Light-burned white clouds
Stone additional amount 1.6t, ore additional amount 1.4t, converter finishing slag basicity 3.2, FeO content is 15.5% in slag.
(12) when carbon content is 0.04%, outlet temperature mentions rifle oxygen feeding stop at 1630 DEG C, pours out part finishing slag, starts
Tapping carries out next heat smelting after the completion of tapping.
Phosphorus content is 0.008% in the heat final steel, dephosphorization rate 91.2%, and comprehensive lime consumption is 22.1kg/ steel, gently
Calcined dolomite consumption is 16.4kg/t steel, is smelted compared to conventional, lime, dolomite reduce 31.1% respectively under the conditions of the molten iron phosphorus
With 40.3%, steel technology reduces 5.5kg/t.
Example 4
Specific step is as follows:
(1) according to converter final slag composition (being shown in Table 4# slag specimen in 1), determining that the furnace stays the quantity of slag is 31kg/t steel, pours out respective slag
After tap.
(2) due in slag FeO content be 13.9%, content be lower than 18%, nut coke is not added.
(3) according to staying content of MgO 5.5w% control in the quantity of slag and dephosphorization phase slag to require, the light-burned white clouds of 700kg are directly added into
Stone carries out slag splashing, and splashing slag ensures that finishing slag is splashed completely in furnace lining inner wall in the process, and ensures that all finishing slags are fully cured；
(4) steel scrap is added according to molten iron temperature (4# molten iron sample in table 2), adding amount of scrap steel 19.5t, always the amount of enclosing is for converter
150t, scrap ratio 13%, 80 ° of tilting converter respectively of front and back, make steel scrap uniformly pave in furnace bottom after steel scrap is added.
(5) according to molten iron phosphorus content (3# molten iron sample in table 2), early period, dephosphorization basicity was controlled by 1.8, in conjunction with staying the quantity of slag
After calculating, 900kg lime is added, the granularity of lime is between 5mm ~ 15mm, effective CaO content 86%, MgO:4%, SiO2:
3%, S:0.05%, activity degree 380ml.
(6) 130.5t molten iron, iron making speed 35t/min is added, converter iron making process is made every effort to uniform, stablized, and converter is avoided
Splash keeps bottom blowing in the open state during iron making, to accelerate melting bath stirring, promotes lime fusing, prevents lime from gluing furnace
Bottom.
(7) after the completion of iron making, start to drop oxygen rifle blowing and reinforce bottom blowing stirring, after igniting, preceding 90s is blown using low rifle position
Refining, oxygen lance nozzle are promoted to molten steel face 1.9m according to spray head after molten steel face 1.6m, 90s, and entire dephosphorization phase oxygen oxygen supply intensity is
1.8m3/ t min, the intensity of argon bottom-blowing are 0.20m3/t▪min。
(8) first is added in the preceding 30s after oxygen rifle igniting to return mine or ore, when additional amount 800kg, 330s is added
Second batch is returned mine or ore, additional amount 400kg.Controlling FeO content finally is 22.5%.
(9) when blowing is to 440s, converter carbon content is 3.3%, blowing oxygen quantity 2065m3, early period, 1380 DEG C of temperature level, mentioned
Rise oxygen rifle, 85 ° of converter inclining pour out 70% or more dephosphorized slag.
(10) it falls after the completion of slag, shakes straight converter, decline oxygen rifle, which is opened, blows, and opens when blowing oxygen rifle pipette tips away from liquid level 1.5m, oxygen stream
Amount is 200m3/ min, oxygen rifle promotes rapidly 0.2m in 4s after igniting, is down to original position again after 6s, opens and blows 30s and start with 7m3/ min's
Rate increases oxygen flow, opens after blowing 60s, and oxygen flow reaches normal value 400m3/ min, oxygen supply by lance intensity are 3.35m3/t▪
Mi, bottom blowing intensity 0.07m3/t▪min。
(11) multiple batches of addition lime and light dolomite, lime adding amount 2.3t, lime granularity exist after regnition
Between 20mm ~ 30mm, effective CaO content 88%, MgO:10%, SiO2:3%, S:0.05%, activity degree 330ml；Light-burned white clouds
Stone additional amount 1.7t, ore additional amount 1.4t, converter finishing slag basicity 3.2, FeO content is 19.5% in slag.
(12) when carbon content is 0.04%, outlet temperature mentions rifle oxygen feeding stop at 1620 DEG C, pours out part finishing slag, starts
Tapping carries out next heat smelting after the completion of tapping.
Phosphorus content is 0.010% in the heat final steel, dephosphorization rate 91.6%, and comprehensive lime consumption is 22.8kg/ steel, gently
Calcined dolomite consumption is 16.4kg/t steel, is smelted compared to conventional, lime, dolomite reduce 31.9% respectively under the conditions of the molten iron phosphorus
With 40.3%, steel technology reduces 5.6kg/t.
Example 5
Specific step is as follows:
(1) according to converter final slag composition (being shown in Table 5# slag specimen in 1), determining that the furnace stays the quantity of slag is 30kg/t steel, pours out respective slag
After tap.
(2) due in slag FeO content be 25.36%, FeO content it is higher, to prevent lining wear and iron making splash, by FeO
The every reduction by 1% of content need to add the requirement of carbon dust 1.5kg/t slag, and nut coke 60kg is added.
(3) light dolomite for being then directly added into 800kg carries out slag splashing, and splashing slag ensures that finishing slag splashes completely in the process
In furnace lining inner wall, and ensure that all finishing slags are fully cured；
(4) be added steel scrap, adding amount of scrap steel 21t, converter always the amount of enclosing be 150t, scrap ratio 14%, steel scrap be added after before
80 ° of tilting converter are distinguished afterwards, and steel scrap is made uniformly to pave in furnace bottom.
(5) according to molten iron phosphorus content (5# molten iron sample in table 2), early period, dephosphorization basicity was controlled by 1.85, in conjunction with staying slag
After amount calculates, 1000kg lime is added, the granularity of lime is between 5mm ~ 15mm, effective CaO content 86%, MgO:4%,
SiO2:3%, S:0.05%, activity degree 380ml.
(6) 129t molten iron, iron making speed 40t/min is added, converter iron making process is made every effort to uniform, stablized, and converter is avoided to spray
It splashes, keeps bottom blowing in the open state during iron making, to accelerate melting bath stirring, promote lime fusing, prevent lime from gluing furnace bottom.
(7) after the completion of iron making, starting to drop oxygen rifle blowing and open bottom blowing stirring, after igniting, preceding 90s is blown using low rifle position,
Oxygen lance nozzle is promoted to molten steel face 1.9m according to spray head after molten steel face 1.6m, 90s, and entire dephosphorization phase oxygen oxygen supply intensity is 2.2m3/
T min, the intensity of argon bottom-blowing are 0.30m3/t▪min。
(8) first is added in the preceding 30s after oxygen rifle igniting to return mine or ore, when additional amount 700kg, 350s is added
Second batch is returned mine or ore, additional amount 500kg.Controlling FeO content finally is 25%.
(9) when blowing is to 440s, converter carbon content is 3.25%, blowing oxygen quantity 2150m3, early period 1400 DEG C of temperature level,
Lift oxygen rifle, 85 ° of converter inclining pour out 70% or more dephosphorized slag.
(10) it falls after the completion of slag, shakes straight converter, decline oxygen rifle, which is opened, blows, and opens when blowing oxygen rifle pipette tips away from liquid level 1.8m, oxygen stream
Amount is 200m3/ min, oxygen rifle promotes rapidly 0.2m in 3s after igniting, is down to original position again after 5s, opens and blows 30s and start with 5m3/ min's
Rate is stepped up oxygen flow, opens after blowing 70s, and oxygen flow reaches normal value 400m3/ min, oxygen supply by lance intensity are 3.6m3/t
Mi, bottom blowing intensity 0.05m3/t▪min。
(11) multiple batches of addition lime and light dolomite, lime adding amount 2.4t, lime granularity exist after regnition
Between 20mm ~ 30mm, effective CaO content 88%, MgO:10%, SiO2:3%, S:0.05%, activity degree 320ml；Light-burned addition
1.7t is measured, ore additional amount 1.3t, converter finishing slag basicity 3.2, FeO content is 16.5% in slag.
(12) when carbon content is 0.03%, outlet temperature mentions rifle oxygen feeding stop at 1635 DEG C, pours out part finishing slag, starts
Tapping carries out next heat smelting after the completion of tapping.
Phosphorus content is 0.011% in the heat final steel, dephosphorization rate 91.2%, and comprehensive lime consumption is 24.2kg/ steel, gently
Calcined dolomite consumption is 17.8kg/t steel, is smelted compared to conventional, lime, dolomite reduce 31.6% respectively under the conditions of the molten iron phosphorus
With 41.9%, steel technology reduces 5.5kg/t.
Example 6
Specific step is as follows:
(1) according to converter final slag composition (being shown in Table 6 # slag specimen in 1), determining that the furnace stays the quantity of slag is 20kg/t steel, pours out respective slag
After tap.
(2) due in slag FeO content be 22.06%, content be greater than 15%, to prevent lining wear and iron making splash, by FeO
The every reduction by 1% of content need to add the requirement of carbon dust 1.5kg/t slag, and nut coke 35kg is added.
(3) according to staying content of MgO 6w% control in the quantity of slag and dephosphorization phase slag to require, it is directly added into the light dolomite of 750kg
Slag splashing is carried out, splashing slag ensures that finishing slag is splashed completely in furnace lining inner wall in the process, and ensures that all finishing slags are fully cured；
(4) steel scrap is added according to molten iron temperature (6# molten iron sample in table 2), adding amount of scrap steel 22.5t, always the amount of enclosing is for converter
150t, scrap ratio 15%, 80 ° of tilting converter respectively of front and back, make steel scrap uniformly pave in furnace bottom after steel scrap is added.
(5) according to molten iron phosphorus content (6# molten iron sample in table 2), early period, dephosphorization basicity was controlled by 2.0, in conjunction with staying the quantity of slag
After calculating, 1200kg lime is added, the granularity of lime is between 5mm ~ 15mm, effective CaO content 86%, MgO:4%, SiO2:
3%, S:0.05%, activity degree 380ml.
(6) 127.5t molten iron, iron making speed 40t/min is added, converter iron making process is made every effort to uniform, stablized, and converter is avoided
Splash keeps bottom blowing in the open state during iron making, to accelerate melting bath stirring, promotes lime fusing, prevents lime from gluing furnace
Bottom.
(7) after the completion of iron making, starting to drop oxygen rifle blowing and open bottom blowing stirring, after igniting, preceding 90s is blown using low rifle position,
Oxygen lance nozzle is promoted to molten steel face 1.9m according to spray head after molten steel face 1.6m, 90s, and entire dephosphorization phase oxygen oxygen supply intensity is 2.2m3/
T min, the intensity of argon bottom-blowing are 0.30m3/t▪min。
(8) first is added in the preceding 30s after oxygen rifle igniting to return mine or ore, when additional amount 600kg, 350s is added
Second batch is returned mine or ore, additional amount 800kg.Controlling FeO content finally is 25%.
(9) when blowing is to 440s, converter carbon content is 3.2%, blowing oxygen quantity 2250m3, early period, 1420 DEG C of temperature level, mentioned
Rise oxygen rifle, 85 ° of converter inclining pour out 70% or more dephosphorized slag.
(10) it falls after the completion of slag, shakes straight converter, decline oxygen rifle, which is opened, blows, and opens when blowing oxygen rifle pipette tips away from liquid level 1.8m, oxygen stream
Amount is 200m3/ min, oxygen rifle promotes rapidly 0.2m in 3s after igniting, is down to original position again after 5s, opens and blows 30s and start with 5m3/ min's
Rate is stepped up oxygen flow, opens after blowing 70s, and oxygen flow reaches normal value 400m3/ min, oxygen supply by lance intensity are 3.6m3/t
Mi, bottom blowing intensity 0.05m3/t▪min。
(11) multiple batches of addition lime and light dolomite, lime adding amount 2.6t, lime granularity exist after regnition
Between 20mm ~ 30mm, effective CaO content 88%, MgO:10%, SiO2:3%, S:0.05%, activity degree 320ml；Light-burned addition
1.7t is measured, ore additional amount 1.3t, converter finishing slag basicity 3.3, FeO content is 16.9% in slag.
(13) when carbon content is 0.03%, outlet temperature mentions rifle oxygen feeding stop at 1630 DEG C, pours out part finishing slag, starts
Tapping carries out next heat smelting after the completion of tapping.
Phosphorus content is 0.013% in the heat final steel, dephosphorization rate 90.7%, and comprehensive lime consumption is 27.1kg/ steel, gently
Calcined dolomite consumption is 17.5kg/t steel, is smelted compared to conventional, lime, dolomite reduce 31.6% respectively under the conditions of the molten iron phosphorus
With 41.1%, steel technology reduces 5.4kg/t.
Claims (8)
1. a kind of converter smelting process of low lime consumption, it is characterised in that: the following steps are included:
(1) before converter tapping, according to P in vessel slag2O5Mass percentage leaves and takes part finishing slag；
(2) after converter tapping, deoxidier is added according to FeO mass percentage situation in slag, reduces slag beneficiation；
(3) whole light dolomites needed for the dephosphorization phase being added carry out slag splashing operation, and guarantee furnace after the completion of slag splashing
Slag all solidifies；
(4) steel scrap is first added, whole lime needed for the dephosphorization phase then is added；
(5) after the completion of lime is added, start to be blended into molten iron, it is uniform, stable that range request is crossed in iron making；
(6) drop oxygen rifle igniting, addition is returned mine after igniting or ore adjusts slag composition；
(7) after dephosphorization time, carbon content, temperature reach requirement, the slag operation of falling dephosphorization is carried out；
(8) it falls after the completion of slag, carries out secondary drop oxygen rifle igniting, and control feeding quantity by basicity requirement；
(9) oxygen feeding stop after carbon, temperature are met the requirements, and according to P in finishing slag2O5Mass percentage leaves and takes part finishing slag, uses
It is smelted in next furnace.
2. a kind of converter smelting process of low lime consumption as described in claim 1, it is characterised in that: in the step (1),
Remained converter slag amount is according to P in slag2O5Mass percentage λ controlled: as λ≤2.0w%, 50kg/t steel < stay the quantity of slag≤
60kg/t steel；As 2.0w% < λ≤2.5w%, 30kg/t steel < stays the quantity of slag≤50kg/t steel；As 2.5w% < λ, 20kg/t steel
≤ quantity of slag≤30kg/t steel is stayed, the present invention is using the stability contorting for first staying the method tapped after slag to be conducive to remained converter slag amount.
3. a kind of converter smelting process of low lime consumption as described in claim 1, it is characterised in that: in the step (2),
Deoxidier additional amount presses following technology controlling and process: as 15 wt % of FeO mass percentage > in slag, FeO mass percentage contains in slag
1 wt % of every increase is measured, deoxidier additional amount increase accordingly 1.5kg/tSlag。
4. a kind of converter smelting process of low lime consumption as described in claim 1, it is characterised in that: in the step (3),
Only add light dolomite when slag splashing, light dolomite additional amount contains according to staying MgO mass percentage in the quantity of slag and dephosphorization phase slag
The requirement of amount is determined, and MgO mass percentage requires control between 5 wt % ~ 6wt% in dephosphorization phase slag, oxygen rifle igniting
Light dolomite is not added afterwards.
5. a kind of converter smelting process of low lime consumption as described in claim 1, it is characterised in that: in the step (4),
Adding amount of scrap steel is determined according to the molten iron temperature T that will smelt heat, and when entering furnace molten iron temperature T≤1300 DEG C, steel scrap is packed into
Ratio is 8% ~ 10%, and when entering furnace molten iron temperature at 1300 DEG C of T≤1380 DEG C <, it is 11% ~ 13% that steel scrap, which is transferred to ratio, when entering furnace
At 1380 DEG C of T >, steel scrap additional proportion is controlled molten iron temperature by 14% ~ 15%；After the completion of steel scrap is added, divide before and after converter
It does not fascinate 75 ° ~ 85 °, steel scrap is made uniformly to pave in furnace bottom；Lime adding amount is according to the content of P, remained converter slag amount in molten iron and takes off
The control of phosphorus phase clinker dual alkalinity R requires to be controlled, when P content in molten iron≤0.07%, dephosphorization phase lime dual alkalinity
It is controlled by 1.2≤R≤1.4；When the P content in 0.07 < molten iron≤0.12%, dephosphorization lime dual alkalinity presses 1.4 < R
≤ 1.8 are controlled；As molten iron phosphorus P content > 0.12%, dephosphorization lime dual alkalinity is controlled by 1.8 R≤2.0 <.
6. a kind of converter smelting process of low lime consumption as described in claim 1, it is characterised in that: in the step (6),
After igniting, preceding 90s is blown using low rifle position, and oxygen lance nozzle is promoted to molten steel face according to spray head after molten steel face 1.2m ~ 1.8m, 90s
1.81m ~ 2.2m, between 1.8m3/t min ~ 2.2m3/t min, dephosphorization phase oxygen-supplying amount accounts for entire dephosphorization phase oxygen oxygen supply intensity
The 28 ~ 32% of total oxygen-supplying amount, duration of blast controls between 420s ~ 450s；The intensity of bottom blowing nitrogen or argon gas is in 0.075m3/t▪
min~0.3m3Between/t min；First is returned mine or ore is added in the preceding 30s after oxygen rifle igniting, and additional amount is the dephosphorization phase
The 5% ~ 10% of total quantity of slag, second batch is returned mine or ore is added when light a fire 320s ~ 350s, additional amount for dephosphorized slag total amount 4% ~
8%；The control of FeO content is between 20 ~ 25% in dephosphorization phase slag.
7. a kind of converter smelting process of low lime consumption as described in claim 1, it is characterised in that: in the step (7),
Time dephosphorization phase controls between 420s ~ 450s, and carbon mass percentage controls between 3.2w% ~ 3.6w%, and temperature is pressed
Following technology controlling and process: when clinker dual alkalinity is in 1.2≤R≤1.4, dephosphorization phase temperature is carried out by 1340 DEG C≤T≤1360 DEG C
Control；When clinker dual alkalinity is in 1.4 < R≤1.8, dephosphorization phase temperature is controlled by 1360 DEG C of T≤1380 DEG C <；Work as furnace
In 1.8 < R≤2.0, dephosphorization phase temperature is controlled slag dual alkalinity by 1380 DEG C of T≤1420 DEG C <, and the when of falling slag converter is inclined
Dynamic 80 ° ~ 92 ° pour out 70% or more dephosphorized slag.
8. a kind of converter smelting process of low lime consumption as described in claim 1, it is characterised in that: in the step (8),
Straight converter is shaken after the completion of slag, oxygen rifle is begun to decline and opens and blow, open oxygen lance nozzle when blowing and be positive away from 1.2 ~ 1.8m of liquid level, oxygen flow
The 50% of normal flow, oxygen rifle promotes 0.2m ~ 0.4m in 2s ~ 5s after igniting, and oxygen rifle is then down to original position in 5s ~ 15s again, is opened
When blowing 30s ~ 40s, start with 5 ~ 7m3/ min uniformly increases oxygen flow to normal discharge, and oxygen flow climbing time control exists
Between 30s ~ 40s, normally between rear oxygen supply intensity 3.0m3/t min ~ 3.5m3/t min, bottom blowing intensity exists oxygen flow
0.05m3/t▪min~0.1m3/t▪min。
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| CN115612777A (en) * | 2022-10-21 | 2023-01-17 | 江苏沙钢集团有限公司 | Converter clean smelting method for efficient dephosphorization |
| CN116377172A (en) * | 2023-03-19 | 2023-07-04 | 新疆八一钢铁股份有限公司 | Operation method for efficient dephosphorization of converter |
| CN117721268A (en) * | 2024-02-18 | 2024-03-19 | 上海大学 | Dephosphorization slag with excellent phosphorus-rich capability and fluidity for converter steelmaking by double slag method at different temperatures and dephosphorization method |
| CN117721268B (en) * | 2024-02-18 | 2024-05-10 | 上海大学 | Dephosphorization slag with excellent phosphorus-rich capability and fluidity for converter steelmaking by double slag method at different temperatures and dephosphorization method |
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Application publication date: 20191025 |