CN109338028A - A kind of efficient slagging process of converter stable state - Google Patents
A kind of efficient slagging process of converter stable state Download PDFInfo
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- CN109338028A CN109338028A CN201811299896.2A CN201811299896A CN109338028A CN 109338028 A CN109338028 A CN 109338028A CN 201811299896 A CN201811299896 A CN 201811299896A CN 109338028 A CN109338028 A CN 109338028A
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- slagging
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- slagging agent
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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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- 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 present invention relates to a kind of efficient slagging process of converter stable state, the specific process is as follows: 50~60% slagging agents are added when 1) bessemerizing beginning, when blowing is to 35~40%, remaining slagging agent, the slagging agent composition and mass percent is added are as follows: CaO 25-45%, Fe2O320-40%, Al2O35-15%, MgO 5-10%, SiO2≤ 10%, impurity element S≤0.25% in slagging agent；2) during bessemerizing beginning to blowing to 90%, oxygen lance position is maintained at 1.6-1.8m, blowing 90% to finishing blowing, and oxygen lance position reduces by 0.2~0.3m, and entire converting process oxygen flow and pressure remain unchanged.Present invention process simplifies converter operation, reduces the fluctuation of converting process oxygen rifle, avoid changing because of rifle position it is improper caused by splash, return the problems such as dry, viscous rifle, viscous cover and reduce blow loss, reduce production cost.
Description
Technical field
The invention belongs to iron and steel smelting technology fields, are related to a kind of efficient slagging process of converter stable state.
Background technique
Pneumatic steelmaking is exactly lifting (also referred to as sliding rifle position) operation using oxygen lance position, passes through the FeO in control clinker
Slag making function is realized to accelerate the fusing of lime, is said to a certain extent, the operation of oxygen top blown converter steel making is exactly to pass through
The variation of oxygen lance position carrys out in regulation and control clinker to have suitable (FeO) content, to meet the needs in converting process each period.
In practical operation, generally using high-low-high multisection type maneuver, (a conventional method oxygen rifle high position is usually 2.0m or so, low level one
As be 1.4m or so), the greatest drawback of this method is to rely on artificial experience, fire door flame and listens attentively to reaction in furnace by observation
The sound is to determine whether slagging, in order to which early slugging then uses high rifle position oxygen blast, accelerates lime to build up FeO in furnace rapidly
Fusing.Since artificial judgment in-furnace temperature is a restricted bottleneck, most steelmakers are before blowing, mid-term all cannot
Accurate judgement in-furnace temperature sprays greatly caused by making C-O intense reaction because of the excessive FeO of accumulation in slag in furnace after causing temperature to increase
It splashes, steelmaker is forced to carry out pressure rifle (low rifle position) operation and the break that feeds (destroying foamed slag) at this time, drops FeO in clinker rapidly
Low, clinker enters again returns dry state.This splash-returns dry process and not only increases steel-making slag charge and steel technology, Er Qiehui
" viscous rifle ", " burning rifle " are caused, while converter terminal Composition Control is caused to seriously affect.Therefore, how to break through tradition and become rifle position
Mode is smelted in residue adjustment, and it is the technical problem that converter smelting needs to solve that the stabilization of process, efficient, environmental protection are bessemerized in realization.
The patent of invention of Publication No. 201410266125.9 discloses a kind of steel-making slagging agent and its application method, leads to
It crosses and adds in the different blowing stage by agstone 30~60%, iron-bearing material 30-60%；Carbon dust 0~10%, organic binder
2% mixes the prepared slagging agent of pressure ball, and slag getting dry can be effectively relieved, prevent converting process splash.
The patent of invention of Publication No. CN201510940604.9 discloses a kind of converter smelting slagging method, is blowing not
Same stage, adjustment and the suitable converter flux of addition by oxygen lance position can reduce the consumption of converter flux, prevent converter from blowing
The splash of refining process clinker, guarantee bessemerize outlet temperature, converter terminal ingredient, and reduce labor intensity of workers, reduce simultaneously
Manufacturing cost.
The patent of invention of Publication No. CN99113322.6 provides a kind of converter slag-making fluxing agent and its uses the fluxing agent
Slagging process, the different blowing stage add it is suitable by Al2O3>=45%, SiO2≤ 30%, Fe2O37~18%, surplus is
CaO、MgO、TiO2, the compositions such as P, S red bauxite, not only contribute to slugging, desulfuration efficiency is high, and furnace retaining effect is good, it is at low cost and
Be conducive to improve ladle life.
The patent of invention of Publication No. CN201610630401.4 provides a kind of semi-steel making slag former and half steel slag making
Method further shortens initial stage slag and forms the time.Semi-steel making slag former, consists of the following components in percentage by weight: Al2O3:
8~18%, SiO2: 50~65%, CaO:6~9%, MgO:5~8%, MnO:4~7% are suitable by blowing stage addition in difference
The slag former of amount can promote rapid slagging, improve converter dephosphorization effect, and do not influence slag splashing effect
Above-mentioned each patent of invention is mainly promoted by blowing the suitable various low melting point slagging agents of stage addition in difference
Converter rapid slagging slag reduces the splash of converting process and returns dry, but converting process oxygen rifle control model does not change,
Residue adjustment is still carried out using change rifle position.This change rifle position smelts mode and still occurs phenomena such as returning dry, splash and viscous rifle often, leads
Cause blow loss higher (blow loss is more than 10%), duration of blast is partially long (duration of blast > 16min), the main reason is that slugging is bad,
Control of lance position relies on very much artificial experience.
Summary of the invention
It is steady the technical problem to be solved by the present invention is to aiming at the above shortcomings existing in the prior art, provide a kind of converter
The efficient slagging process of state passes through the reasonable of preferred slugging agent prescription and oxygen lance position (i.e. distance of the oxygen lance nozzle to molten steel face)
Adjust so that bessemerize Steady-state process progress, prevent to change because of rifle position it is improper caused by splash, return dry, viscous rifle, viscous cover etc.
Problem, and efficient slag making, because slugging is good, slagging speed is fast, can reduce and bessemerize the time, and steel technology is few, converter
Terminal iron and steel component is controllable.
In order to solve the above technical problems, present invention provide the technical scheme that
A kind of efficient slagging process of converter stable state is provided, the specific process is as follows:
1) when bessemerizing beginning, 50~60% slagging agents, blowing to 35~40% (times of entire converting process is added
Percentage) when, remaining slagging agent, the slagging agent composition and mass percent is added are as follows: CaO25-45%, Fe2O3 20-
40%, Al2O35-15%, MgO 5-10%, SiO2≤ 10%, impurity element S≤0.25% in slagging agent；
2) beginning is bessemerized to blowing to during 90%, it is constant that oxygen lance position is maintained at 1.6-1.8m, blowing 90%
To finishing blowing, oxygen lance position reduces by 0.2~0.3m, and remains unchanged, and entire converting process oxygen flow and pressure are kept not
Become.
According to the above scheme, when bessemerizing beginning, slagging agent and other slag charges (slag materials such as lime, light-burned) add simultaneously
Enter.
According to the above scheme, the slagging agent granularity be 10~50mm, slagging agent usage amount are as follows: when enter Si in furnace molten iron≤
When 0.3%, slagging agent additional amount is 4.5~7.5kg/t steel；When entering furnace molten iron Si content is 0.3~0.6%, slagging agent adds
Entering amount is 3.5~4.5kg/t steel；When entering furnace molten iron Si content > 0.6%, slagging agent additional amount is 2.0~3.5kg/t steel.
The beneficial effects of the present invention are: the efficient slagging process of converter stable state provided by the invention is kept in converting process
Rifle position is constant, while being aided with a kind of efficient slagging agent progress residue adjustment, simplifies converter operation, reduces the wave of converting process oxygen rifle
It is dynamic, can avoid changing because of rifle position it is improper caused by splash, return the problems such as dry, viscous rifle, viscous cover, can Fast Slag Melting, reduce converter
Duration of blast reduces Fe in converter terminal oxygen and slag2O3, steel technology is reduced, blow loss is reduced, reduces production cost.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention makees the present invention below with reference to embodiment
It is described in further detail.
The embodiment of the present invention has carried out the application of the method for the present invention in 180t converter, to Fe in converter terminal oxygen, slag2O3、
Terminal [P], converter blow loss etc. are analyzed.
Embodiment 1
The efficient slagging process of 180t converter stable state:
Iron water amount 156t, steel scrap amount 23t, molten iron [Si] be 0.47%, 1285 DEG C of molten iron temperature, slagging agent ingredient used and
Mass percent is CaO 45%, Fe2O329%, Al2O310%, MgO 5%, SiO210%, wherein impurity is first in slagging agent
Plain S 0.25%, granularity are 10~50mm；It opens and is blown to blowing 90%, oxygen lance position keeps 1.6m, opens slagging agent when blowing and is added
Amount is 1.75kg/t, is added with other flux, and when blowing is to 35%, 1.75kg/t slagging agent is added；When blowing is to 90%,
Oxygen lance position reduces 0.2m to 1.4m, and keeps to finishing blowing.It is 0.060% that finishing blowing, which measures converter terminal oxygen, temperature
It is 1670 DEG C, [P] is 0.015%, tap 168t, blow loss 6.14%, Fe in slag2O313.82%, duration of blast is
14.5min, steel technology are 1081.6kg/t steel.
1 is shown in Table using the present embodiment process and conventional slagging process (becoming rifle position slagging process) method comparing result.
Embodiment 2
The efficient slagging process of 180t converter stable state:
Iron water amount 154t, steel scrap amount 28t, molten iron [Si] are 0.65%, and 1360 DEG C of molten iron temperature, slagging agent ingredient used is
CaO 25%, Fe2O340%, Al2O314%, MgO 10%, SiO210%, wherein impurity element S 0.20% in slagging agent,
Its granularity is 10~50mm；It opens and is blown to blowing 90%, oxygen lance position keeps 1.8m, and opening slagging agent additional amount when blowing is 1.0kg/t,
It is added with other flux, when blowing is to 35%, 1.0kg/t slagging agent is added；When blowing is to 90%, oxygen lance position is reduced
0.3m to 1.5m, and keep to finishing blowing.It is 0.0513% that finishing blowing, which measures converter terminal oxygen, and temperature is 1680 DEG C, [P]
It is 0.016%, tap 172t, blow loss 5.49%, Fe in slag2O315.12%, duration of blast 15.0min, iron and steel stock
Consumption is 1080.2kg/t steel.
1 is shown in Table using the present embodiment process and conventional slagging process (becoming rifle position slagging process) method comparing result.
Embodiment 3
The efficient slagging process of 180t converter stable state:
Iron water amount 155t, steel scrap amount 26t, molten iron [Si] are 0.28%, and 1320 DEG C of molten iron temperature, slagging agent ingredient used is
CaO 39%, Fe2O339%, Al2O35%, MgO 8%, SiO28%, wherein impurity element S 0.22% in slagging agent,
Granularity is 10~50mm；It opens and is blown to blowing 90%, oxygen lance position is maintained at 1.7m, and opening slagging agent additional amount when blowing is 4.5kg/t,
It is added with other flux, when blowing is to 35%, 3.0kg/t slagging agent is added；When blowing is to 90%, oxygen lance position is reduced
0.3m to 1.4m, and keep to finishing blowing.It is 0.0491% that finishing blowing, which measures converter terminal oxygen, and temperature is 1650 DEG C, [P]
It is 0.013%, tap 165t, blow loss 7.84%, Fe in slag2O314.12%, duration of blast 15.1min, iron and steel stock
Consumption is 1078.8kg/t steel.
1 is shown in Table using the present embodiment process and conventional slagging process (becoming rifle position slagging process) method comparing result.
Embodiment 4
The efficient slagging process of 180t converter stable state:
Iron water amount 155t, steel scrap amount 23t, molten iron [Si] are 0.55%, and 1340 DEG C of molten iron temperature, slagging agent ingredient used is
CaO 45%, Fe2O320%, Al2O315%, MgO 9%, SiO210%, wherein impurity element S 0.18% in slagging agent,
Its granularity is 10~50mm；It opens and is blown to blowing 90%, oxygen lance position is maintained at 1.6m, and opening slagging agent additional amount when blowing is 2.2kg/
T is added with other flux, and when blowing is to 35%, 1.8kg/t slagging agent is added；When blowing is to 90%, oxygen lance position is reduced
0.2m to 1.4m, and keep to finishing blowing.It is 0.0555% that finishing blowing, which measures converter terminal oxygen, and temperature is 1665 DEG C, [P]
It is 0.013%, tap 169t, blow loss 5.06%, Fe in slag2O314.7%, duration of blast 14.8min, iron and steel stock
Consumption is 1079.5kg/t steel.
1 is shown in Table using the present embodiment process and conventional slagging process (becoming rifle position slagging process) method comparing result.
Table 1
Claims (2)
1. a kind of efficient slagging process of converter stable state, which is characterized in that the specific process is as follows:
1) when bessemerizing beginning, 50~60% slagging agents are added, when blowing is to 35~40%, remaining slagging agent is added, it is described
Slagging agent composition and mass percent are as follows: CaO 25-45%, Fe2O320-40%, Al2O35-15%, MgO 5-10%, SiO2
≤ 10%, impurity element S≤0.25% in slagging agent；
2) beginning is bessemerized to blowing to during 90%, it is constant that oxygen lance position is maintained at 1.6-1.8m, and blowing 90% is to blowing
Refining terminates, and oxygen lance position reduces by 0.2~0.3m, and remains unchanged, and entire converting process oxygen flow and pressure remain unchanged.
2. the efficient slagging process of converter stable state according to claim 1, which is characterized in that the slagging agent granularity be 10~
50mm, slagging agent usage amount are as follows: when entering Si≤0.3% in furnace molten iron, slagging agent additional amount is 4.5~7.5kg/t steel；When entering
When furnace molten iron Si content is 0.3~0.6%, slagging agent additional amount is 3.5~4.5kg/t steel；When entering furnace molten iron Si content >
When 0.6%, slagging agent additional amount is 2.0~3.5kg/t steel.
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| CN201811299896.2A CN109338028A (en) | 2018-11-02 | 2018-11-02 | A kind of efficient slagging process of converter stable state |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112522471A (en) * | 2020-11-19 | 2021-03-19 | 山东工业职业学院 | Composite sintered slag power promoter for converter steady-state smelting and use method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112522471A (en) * | 2020-11-19 | 2021-03-19 | 山东工业职业学院 | Composite sintered slag power promoter for converter steady-state smelting and use method thereof |
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