CN107475470A - A kind of blast furnace uses the damping down method of pelletizing at high proportion under furnace retaining state - Google Patents
A kind of blast furnace uses the damping down method of pelletizing at high proportion under furnace retaining state Download PDFInfo
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- CN107475470A CN107475470A CN201710703445.XA CN201710703445A CN107475470A CN 107475470 A CN107475470 A CN 107475470A CN 201710703445 A CN201710703445 A CN 201710703445A CN 107475470 A CN107475470 A CN 107475470A
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- blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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Abstract
Adding the damping down method methods described of pelletizing at high proportion under furnace retaining state the invention discloses a kind of blast furnace includes blast furnace burden Composition Control, the control of molten iron titaniferous amount, damping down time control；The blast furnace burden Composition Control, using sintering deposit, pellet, lime stone as raw material, required to determine raw material proportioning according to slag composition.The pellet ratio of confecting polymer water of the present invention is higher, reduces use ratio of the sintering deposit in blast furnace, has widened the use range of Bf Burden；Under blast furnace protecting state, the pellet ratio of titaniferous is reduced before blast furnace staying, use ratio of the sintering deposit in blast furnace is improved, improves the gas permeability of stock column in stove, blast furnace is recovered the working of a furnace rapidly after air-supply, reduce the fluctuation of molten iron titaniferous amount, due to the fast quick-recovery of the working of a furnace, silicon content of hot metal is down to normal level quickly, has both reached the purpose of furnace retaining, there can be the characteristics of production cost is low, technique is simple with stable furnace condition again.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of blast furnace stopping using pelletizing at high proportion under furnace retaining state
Wind method.
Background technology
Current Environmental Protection in China pressure is very big, and sintering circuit process pollutant emission accounting before whole iron is higher.It is and traditional
Bf Burden mainly using sintering deposit as raw material, supplemented by pellet, rawore, blast furnace does not adjust furnace charge substantially before damping down
Structure.In order to reduce pollutant emission, blast furnace begins to use larger proportion pellet, blast furnace using high proportion pellet ore and
Under furnace retaining state, due to requirement of the blast furnace to furnace condition anterograde after the fast quick-recovery working of a furnace and air-supply, needed before damping down to hot metal composition
It is adjusted, this just needs blast furnace to adjust burden structure.Currently, the production of High Level Sinter burden structure is used for blast furnace
It is very ripe, and it is domestic still immature using pelletizing technology at high proportion, especially during blast furnace is stopped and blown, in furnace retaining shape
Under state, how to keep permeability of stock column and cupola well liquid permeability is to need to solve the problems, such as.Therefore, solve under furnace retaining state at high proportion
Pelletizing blast furnace staying problem, furnace condition anterograde degree after air-supply can be improved, while ensure furnace retaining effect, improved blast-furnace technique and refer to
Mark.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of blast furnace to use the damping down of pelletizing at high proportion under furnace retaining state
Method.
In order to solve the above technical problems, the present invention adopts the technical scheme that：A kind of blast furnace uses height under furnace retaining state
The damping down method of ratio pelletizing, methods described include blast furnace burden Composition Control, the control of molten iron titaniferous amount, damping down time control；
The blast furnace burden Composition Control, using sintering deposit, pellet, lime stone as raw material, required to determine that raw material is matched somebody with somebody according to slag composition
Than.
Blast furnace burden Composition Control of the present invention, charge composition proportioning are：Sintering deposit ratio is 5-40%, pellet ratio
Example be 60-90%, and lime stone ratio be 0-5%, by each composition mixing addition blast furnace, the as burden structure of pelletizing at high proportion.
Molten iron titaniferous amount control of the present invention, molten iron titaniferous amount is 0.120-0.180%.
Pellet of the present invention includes fluxed pelletses ore deposit and magnesia acidic pellet ore, magnesian flux pellet accounting
For 0-60%, magnesia acidic pellet ore accounting is 0-30%.
Fluxed pelletses ore deposit composition and weight/mass percentage composition of the present invention are：SiO2：4~6%, MgO：1.5~2%,
CaO：4~6%, TiO2：0.5~1.5%.
Magnesia acidic pellet ore composition and weight/mass percentage composition of the present invention are：SiO2：5~7%, MgO：1~3%,
CaO：1~3%, TiO2：0.3~1.5%.
The present invention is according to the damping down time, and 48h prepares sintering deposit in advance, and demand is 3-6 smelting cycle, sintering deposit with addition of
Ratio is 10-50%.
The present invention adjusts pellet ratio according to damping down time, in advance 5-24h, and pellet presses molten iron Ti contents with addition of ratio
0.10-0.15% is calculated, few to add or stop adding lime stone, basicity of slag 1.0-1.2.
Last time silicon content of hot metal is 0.5-0.8% before damping down of the present invention；Ratio of putting coke into furnace improves 10-100kg/t, damping down
When light load expect up to returning 1m under on bosh.
The mentality of designing of the present invention is as follows：Titanium is with TiO in blast furnace raw material2Form is present, the TiO in blast furnace ironmaking process2Portion
Point being reduced into Ti elements enters molten iron, other TiO not being reduced2Into in clinker.TiO2It is reduced into molten iron
Amount, many factors are influenceed in by smelting process in blast furnace, can only be a trend, i.e.,：The TiO contained in blast furnace raw material2It is high
A bit, TiO2The ratio into molten iron is reduced with regard to higher.
And the blast furnace under furnace retaining state, the requirement for titaniferous amount in iron is also different, and cupola well refractory material corrodes
Serious blast furnace needs molten iron titaniferous amount higher, on the contrary, corroding not serious needs molten iron titaniferous amount lower.
Damping down time length then requires that molten iron titaniferous amount reduces more, and magnesian flux pellet ratio to be reduced more
Some；Conversely, the damping down time is short, then require that molten iron titaniferous amount reduces few, magnesian flux type pellet ratio can not
Adjustment or few adjustment.
The damping down time is longer, it is desirable to which molten iron titaniferous amount is lower, and corresponding sintering deposit ratio is higher, magnesian flux pellet
Ratio is lower, and those skilled in the art can rule of thumb judge to reduce the level of molten iron titaniferous amount.Sintering deposit, magnesia acid ball
Nodulizing, magnesian flux pellet, the lime stone needs of both proportion satisfaction in Bf Burden：On the one hand it is
Production needs, and is on the other hand the needs of blast-furnace slag basicity, and the calculation formula of blast-furnace slag basicity is as follows：
SiO in CaO content/slag in basicity of slag R2=slag2Content；
CaO content=sintering deposit CaO content+lime stone CaO content+magnesia acidic pellet ore CaO content+magnesian flux in slag
Pellet CaO content+fuel C aO contents-dedusting ash CaO content；
SiO in slag2Content=sintering deposit SiO2Content+lime stone SiO2Content+magnesia acidic pellet ore SiO2Content+magnesia molten
Agent pellet SiO2Content+fuel SiO2Content-dedusting ash SiO2Content-silicon content of hot metal × 60/28.
The inventive method reduces the proportioning of titaniferous pellet in Bf Burden under blast furnace protecting state, it is few plus or
Person stops with addition of lime stone, reduces the fluctuation of molten iron titaniferous amount, can both reach furnace retaining effect, can make blast furnace liquid slag iron unlikely again
It is too sticky in the decline because of temperature.
The inventive method, due to the stable smooth operation of the working of a furnace, can improve pellet ratio rapidly to not after blast furnace air-supply
Horizontal before wind, blast-furnace technique index is rapidly reached normal level.
It is using beneficial effect caused by above-mentioned technical proposal：1st, the pellet ratio of confecting polymer water of the present invention compared with
Height, fluxed pelletses and magnesia acidic pellet ore can be used（The ratio of two kinds of pelletizings needs to adjust according to basicity of slag）, drop
Low use ratio of the sintering deposit in blast furnace, has widened the use range of Bf Burden.2nd, the present invention is in blast furnace protecting
Under state, the pellet ratio of titaniferous is reduced before blast furnace staying, improves use ratio of the sintering deposit in blast furnace, is improved in stove
The gas permeability of stock column, blast furnace is recovered the working of a furnace rapidly after air-supply, reduce the fluctuation of molten iron titaniferous amount；It is quick extensive due to the working of a furnace
It is multiple, Silicon Content In Hot Metal of Blast Furnace quickly be reduced to normal level, both reached the purpose of furnace retaining, again can be with stable furnace condition.3rd, adopt
It can make blast furnace furnace condition anterograde in air-supply with this method, and not influence furnace retaining effect, can especially use ball at high proportion
The burden structure of group.4th, this method has the characteristics of production cost is low, technique is simple.
Embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1
Damping down method concrete technology step of the present embodiment blast furnace using pelletizing at high proportion under furnace retaining state is as described below：
（1）The parameter of the normal working of a furnace is as follows under furnace retaining state：
Bf Burden：Sintering deposit ratio 18%, pellet ratio 80%, lime stone ratio 2%.
Molten iron titaniferous amount：0.150%.The mass fraction of the fluxed pelletses ore deposit component requirements is：SiO2：5%, MgO：
1.8%, CaO：6%, TiO2：0.9%；The mass fraction of the magnesia acidic pellet ore component requirements is：SiO2：6.5%, MgO：
1.5%, CaO：2.3%, TiO2：0.5%.
Basicity of slag 1.15；Silicon content of hot metal 0.5%；Ratio of putting coke into furnace 380kg/t.
（2）Scheduling of production 8h damping down, the parameter adjustment of the working of a furnace are as follows：
Bf Burden：Sintering deposit ratio 23.5%, pellet ratio 75%, lime stone ratio 1.5%.
Molten iron titaniferous amount：0.140%.The mass fraction of the fluxed pelletses ore deposit component requirements is：SiO2：5%, MgO：
1.8%, CaO：6%, TiO2：0.9%；The mass fraction of the magnesia acidic pellet ore component requirements is：SiO2：6.5%, MgO：
1.5%, CaO：2.3%, TiO2：0.5%.
Basicity of slag 1.12；Silicon content of hot metal 0.55%；Ratio of putting coke into furnace is improved to 400kg/t；Light load, which is expected, during damping down reaches
On bosh 1m is returned under.
Embodiment 2
Damping down method concrete technology step of the present embodiment blast furnace using pelletizing at high proportion under furnace retaining state is as described below：
（1）The parameter of the normal working of a furnace is as follows under furnace retaining state：
Bf Burden：Sintering deposit ratio 18%, pellet ratio 80%, lime stone ratio 2%.
Molten iron titaniferous amount：0.180%.The mass fraction of the fluxed pelletses ore deposit component requirements is：SiO2：4.5%, MgO：
1.7%, CaO：5.2%, TiO2：0.52%；The mass fraction of the magnesia acidic pellet ore component requirements is：SiO2：5.5%, MgO：
1.5%, CaO：2.0%, TiO2：0.3%.
Basicity of slag 1.15；Silicon content of hot metal 0.5%；Ratio of putting coke into furnace 380kg/t.
（2）Scheduling of production 24h damping down, the parameter adjustment of the working of a furnace are as follows：
Bf Burden：Sintering deposit ratio 35%, pellet ratio 64.5%, lime stone ratio 0.5%.
Molten iron titaniferous amount：0.120%.The mass fraction of the fluxed pelletses ore deposit component requirements is：SiO2：4.5%, MgO：
1.7%, CaO：5.2%, TiO2：0.52%；The mass fraction of the magnesia acidic pellet ore component requirements is：SiO2：5.5%, MgO：
1.5%, CaO：2.0%, TiO2：0.3%.
Basicity of slag 1.08；Silicon content of hot metal 0.65%；Ratio of putting coke into furnace 430kg/t；Light load is expected up on bosh during damping down
1m is returned under.
Embodiment 3
Damping down method concrete technology step of the present embodiment blast furnace using pelletizing at high proportion under furnace retaining state is as described below：
（1）The parameter of the normal working of a furnace is as follows under furnace retaining state：
Bf Burden：Sintering deposit ratio 18%, pellet ratio 80%, lime stone ratio 2%.
Molten iron titaniferous amount：0.120%.The mass fraction of the fluxed pelletses ore deposit component requirements is：SiO2：4.8%, MgO：
1.6%, CaO：5.1%, TiO2：0.75%；The mass fraction of the magnesia acidic pellet ore component requirements is：SiO2：6.3%, MgO：
1.3%, CaO：2.3%, TiO2：0.3%.
Basicity of slag 1.15；Silicon content of hot metal 0.5%；Ratio of putting coke into furnace 380kg/t.
（2）Scheduling of production 16h damping down, the parameter adjustment of the working of a furnace are as follows：
Bf Burden：Sintering deposit ratio 30%, pellet ratio 70%, lime stone ratio 1%.
Molten iron titaniferous amount：0.10%.The mass fraction of the fluxed pelletses ore deposit component requirements is：SiO2：4.8%, MgO：
1.6%, CaO：5.1%, TiO2：0.75%；The mass fraction of the magnesia acidic pellet ore component requirements is：SiO2：6.3%, MgO：
1.3%, CaO：2.3%, TiO2：0.3%.
Basicity of slag 1.10；Silicon content of hot metal 0.65%；Ratio of putting coke into furnace 410kg/t；Light load is expected up on bosh during damping down
1m is returned under.
Embodiment 4
Damping down method concrete technology step of the present embodiment blast furnace using pelletizing at high proportion under furnace retaining state is as described below：
（1）The parameter of the working of a furnace is as follows under furnace retaining state：
Bf Burden：Sintering deposit ratio 16%, pellet ratio 80%, lime stone ratio 4%.
Molten iron titaniferous amount：0.150%.The mass fraction of the fluxed pelletses ore deposit component requirements is：SiO2：4.7%, MgO：
1.8%, CaO：5.3%, TiO2：0.93%；The mass fraction of the magnesia acidic pellet ore component requirements is：SiO2：6.4%, MgO：
1.1%, CaO：2.1%, TiO2：0.35%.
Basicity of slag 1.15；Silicon content of hot metal 0.5%；Ratio of putting coke into furnace 380kg/t.
（2）Scheduling of production 48h damping down, the parameter adjustment of the working of a furnace are as follows：
Bf Burden：Sintering deposit ratio 40%, pellet ratio 60%, lime stone ratio 0%.
Molten iron titaniferous amount：0.10%.The mass fraction of the fluxed pelletses ore deposit component requirements is：SiO2：4.7%, MgO：
1.8%, CaO：5.3%, TiO2：0.93%；The mass fraction of the magnesia acidic pellet ore component requirements is：SiO2：6.4%, MgO：
1.1%, CaO：2.1%, TiO2：0.35%.
Basicity of slag 1.05；Silicon content of hot metal 0.75%；Ratio of putting coke into furnace 450kg/t；Light load is expected up on bosh during damping down
1m is returned under.
Embodiment 5
Damping down method concrete technology step of the present embodiment blast furnace using pelletizing at high proportion under furnace retaining state is as described below：
（1）The parameter of the working of a furnace is as follows under furnace retaining state：
Bf Burden：Sintering deposit ratio 5%, pellet ratio 90%, lime stone ratio 5%.
Molten iron titaniferous amount：0.175%.The mass fraction of the fluxed pelletses ore deposit component requirements is：SiO2：4.0%, MgO：
1.5%, CaO：4.0%, TiO2：0.5%；The mass fraction of the magnesia acidic pellet ore component requirements is：SiO2：5%, MgO：
1.0%, CaO：1.0%, TiO2：0.7%.
Basicity of slag 1.15；Silicon content of hot metal 0.5%；Ratio of putting coke into furnace 380kg/t.
（2）Scheduling of production 12h damping down, the parameter adjustment of the working of a furnace are as follows：
Bf Burden：Sintering deposit ratio 10%, pellet ratio 85%, lime stone ratio 5%.
Molten iron titaniferous amount：0.15%.The mass fraction of the fluxed pelletses ore deposit component requirements is：SiO2：4.0%, MgO：
1.5%, CaO：4.0%, TiO2：0.5%；The mass fraction of the magnesia acidic pellet ore component requirements is：SiO2：5%, MgO：
1.0%, CaO：1.0%, TiO2：0.7%.
Basicity of slag 1.10；Silicon content of hot metal 0.6%；Ratio of putting coke into furnace 390kg/t；Light load is expected up on bosh during damping down
1m is returned under.
Embodiment 6
Damping down method concrete technology step of the present embodiment blast furnace using pelletizing at high proportion under furnace retaining state is as described below：
（1）The parameter of the working of a furnace is as follows under furnace retaining state：
Bf Burden：Sintering deposit ratio 25%, pellet ratio 72%, lime stone ratio 3%.
Molten iron titaniferous amount：0.145%.The mass fraction of the fluxed pelletses ore deposit component requirements is：SiO2：6%, MgO：
2%, CaO：5.5%, TiO2：1.5%；The mass fraction of the magnesia acidic pellet ore component requirements is：SiO2：7%, MgO：3%,
CaO：3%, TiO2：0.3%.
Basicity of slag 1.15；Silicon content of hot metal 0.5%；Ratio of putting coke into furnace 380kg/t.
（2）Scheduling of production 36h damping down, the parameter adjustment of the working of a furnace are as follows：
Bf Burden：Sintering deposit ratio 50%, pellet ratio 50%, lime stone ratio 0%.
Molten iron titaniferous amount：0.110%.The mass fraction of the fluxed pelletses ore deposit component requirements is：SiO2：6%, MgO：
2%, CaO：5.5%, TiO2：1.5%；The mass fraction of the magnesia acidic pellet ore component requirements is：SiO2：7%, MgO：3%,
CaO：3%, TiO2：0.3%.
Basicity of slag 1.05；Silicon content of hot metal 0.8%；Ratio of putting coke into furnace 480kg/t；Light load is expected up on bosh during damping down
1m is returned under.Above-described embodiment had both reached the purpose of furnace retaining, again can be with stable furnace condition；Can send blast furnace using this method
Furnace condition anterograde during wind, and furnace retaining effect is not influenceed, the burden structure of pelletizing at high proportion can be especially used, has and is produced into
The characteristics of this is low, technique is simple.
Above example is only to illustrative and not limiting technical scheme, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those within the art that：Still the present invention can be modified or be waited
With replacing, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover the power in the present invention
Among sharp claimed range.
Claims (9)
1. a kind of blast furnace uses the damping down method of pelletizing at high proportion under furnace retaining state, it is characterised in that methods described includes height
The control of stove charge composition, the control of molten iron titaniferous amount, damping down time control；The blast furnace burden Composition Control, with sintering deposit, pelletizing
Ore deposit, lime stone are raw material, are required to determine raw material proportioning according to slag composition.
2. a kind of blast furnace according to claim 1 uses the damping down method of pelletizing at high proportion, its feature under furnace retaining state
It is, the blast furnace burden Composition Control, charge composition proportioning is：Sintering deposit ratio is 5-40%, and pellet ratio is 60-
90%, lime stone ratio is 0-5%, and each composition is mixed and adds blast furnace, the as burden structure of pelletizing at high proportion.
3. a kind of blast furnace according to claim 1 uses the damping down method of pelletizing at high proportion, its feature under furnace retaining state
It is, the molten iron titaniferous amount control, molten iron titaniferous amount is 0.120-0.180%.
4. a kind of blast furnace according to claim 1-3 any one uses the damping down side of pelletizing at high proportion under furnace retaining state
Method, it is characterised in that the pellet includes fluxed pelletses ore deposit and magnesia acidic pellet ore, magnesian flux pellet accounting
For 0-60%, magnesia acidic pellet ore accounting is 0-30%.
5. a kind of blast furnace according to claim 1-3 any one uses the damping down side of pelletizing at high proportion under furnace retaining state
Method, it is characterised in that the fluxed pelletses ore deposit composition and weight/mass percentage composition are：SiO2：4~6%, MgO：1.5~2%,
CaO：4~6%, TiO2：0.5~1.5%.
6. a kind of blast furnace according to claim 1-3 any one uses the damping down side of pelletizing at high proportion under furnace retaining state
Method, it is characterised in that the magnesia acidic pellet ore composition and weight/mass percentage composition are：SiO2：5~7%, MgO：1~3%,
CaO：1~3%, TiO2：0.3~1.5%.
7. a kind of blast furnace according to claim 1-3 any one uses the damping down side of pelletizing at high proportion under furnace retaining state
Method, it is characterised in that according to damping down time length, 48h prepares sintering deposit in advance, and demand is 3-6 smelting cycle, sintering deposit
It is 10-50% with addition of ratio.
8. a kind of blast furnace according to claim 1-3 any one uses the damping down side of pelletizing at high proportion under furnace retaining state
Method, it is characterised in that according to damping down time, the pellet ratio of 5-24h adjustment in advance, pellet presses molten iron Ti contents with addition of ratio
0.10-0.15% is calculated, few to add or stop adding lime stone, basicity of slag 1.0-1.2.
9. a kind of blast furnace according to claim 1-3 any one uses the damping down side of pelletizing at high proportion under furnace retaining state
Method, it is characterised in that last time silicon content of hot metal is 0.5-0.8% before damping down；Ratio of putting coke into furnace improves 10-100kg/t, damping down
When light load expect up to returning 1m under on bosh.
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| CN114085938A (en) * | 2021-11-16 | 2022-02-25 | 包头钢铁（集团）有限责任公司 | Process for smelting limestone type fluorine-containing fluxed pellets under high-pellet-ratio condition of large blast furnace |
| CN114807466A (en) * | 2021-01-28 | 2022-07-29 | 上海梅山钢铁股份有限公司 | Method for adjusting and adding furnace charge before long-term damping down of iron-making blast furnace |
| TWI776499B (en) * | 2020-05-15 | 2022-09-01 | 日商杰富意鋼鐵股份有限公司 | blast furnace operation method |
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| CN107475470B (en) | 2019-07-02 |
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