CN103468838B - Blast furnace ironmaking technology adopting high pellet ore proportion - Google Patents
Blast furnace ironmaking technology adopting high pellet ore proportion Download PDFInfo
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- CN103468838B CN103468838B CN201310370461.3A CN201310370461A CN103468838B CN 103468838 B CN103468838 B CN 103468838B CN 201310370461 A CN201310370461 A CN 201310370461A CN 103468838 B CN103468838 B CN 103468838B
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Abstract
The invention relates to the technical field of metallurgy coking, particularly to a blast furnace operation method adopting high-proportion pellet ore. The method comprises the following steps: preparing pellet ore with the content of MgO higher than 2.5%, the content of SiO2 lower than 5.5%, the total content of Na2O and K2O lower than 0.1% and the content of ZnO lower than 0.05%, and then roasting the pellet ore; putting the obtained ore with the pellet ore quality content of 45%-55% into a blast furnace, performing burden distribution, and smelting with low silicon content, so as to obtain cast iron. According to the invention, the technology is simple; through improving the composition content and the organizational structure of the pellet ore and adjusting technical parameters for melting of the blast furnace, stable operation of the blast furnace during smelting the ore with the pellet ore quality content higher than 45% can be ensured, and enterprise benefit is improved.
Description
Technical field
The present invention relates to metallurgical coking technical field, is a kind of blast furnace iron-making process using high pellet ratio specifically.
Background technology
At present, during domestic blast furnace ironmaking, pellet enters stove ratio and is generally less than 15%, and the stove pellet ore that enters of indivedual iron and steel enterprises ironmaking reaches 30% ratio, but the long-term blast furnace technology keeping the high pellet ratio of more than 45%, also do not have now.In external ironmaking technology, pellet have reach 100% enter stove ratio, but its pellet is fluxed pellets, non-acid oxygenated pellet, and its SiO
2content, below 3.0%, adheres to two kinds of different sorts pellets separately with domestic pellet.
Blast furnace ironmaking in prior art, because of agglomerate insufficient raw material, so enter pellet ratio in stove ore need increase to more than 40%.In this case, blast furnace there will be in smelting process significantly suppresses wind phenomenon, and avalanche material, hanging increase, frequently occur that pipeline trip (to make in stove Gas Flow from the place of local good permeability because breathability of stock column for blast furnace difference, a passage is blown out from down to up) in blast furnace, this makes raw material just drop down onto furnace bottom without abundant preheating and reduction, causes that high furnace temperature reduces, heat energy utilization is poor, the frequent dross of stove internal upper part.For solving the problems of the technologies described above, production technique can only be forced to reduce pellet enter stove ratio (namely entering the mass content in the total ore of stove) to less than 35%, reduce combustion intensity, the working of a furnace could take a turn for the better.So, domestic blast furnace iron-making process long-standing problem of the prior art in sintering nervous → put forward the vicious cycle vicious circle of pellet ratio → furnace condition disorder → fall pellet ratio → sintering anxiety again, iron-smelting blast furnace is difficult to keep long steady running, and technico-economical comparison is undesirable.
Summary of the invention
In order to overcome prior art deficiency, the invention provides a kind of blast furnace iron-making process using high pellet ratio.Present invention process is simple, by improving component concentration and the weave construction of pellet, adjusts some technical parameters during blast-furnace smelting in addition, makes blast furnace steady running when the ore of smelting palletizing ore deposit mass content up to more than 45%, improves the performance of enterprises.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
Use a blast furnace iron-making process for high pellet ratio, comprise pellet preparation and blast-furnace smelting step,
The first step, prepare pellet:
By iron ore concentrate, wilkinite, to mix by a certain percentage containing the material of MgO and make content of MgO in mixture be greater than 2.5%, SiO
2content is lower than 5.5%, Na
2o and K
2the total content of O is less than 0.1%, ZnO < 0.05%; The raw material prepared is made the green-ball that granularity is Φ 8 ~ 14mm, and be not less than the roasting temperature of 1150 DEG C, gained pellet strength reaches more than 2200N;
Second step, blast-furnace smelting: the ore being 45% ~ 55% by the first step gained pellet quality content puts into blast furnace, and cloth, low silicon smelting, obtain the pig iron.
During pellet raw material batching, the proportioning of each raw material can mix by the proportioning of prior art, and then the material added wherein containing MgO, improve content of MgO in pellet, and improve the particle size uniformity of raw material, improve the weave construction of the rear gained pellet of its sintering, stabilize the quality of pellet, control alkali metal content in the total ore of sintering simultaneously, reduce its harm, reach the object improved into stove pellet ore ratio.Under the prerequisite of blast furnace steady running, pellet can be stabilized in 45% with addition of ratio, can reach 55%.
Preferably, in the first step, during batching, by adding in Mg-high andesite, high magnesium ore deposit or steel-smelting sewage sludge, one or more regulate and control content of MgO in raw materials.
Magnesium source raw material is simple and easy to get, by increasing content of MgO in pellet, improve the softening of pellet and melt temperature, inhibit the low-temperature reduction of pellet to expand, improve the ventilation property of lumpy zone in blast furnace.
Preferably, in the first step, in the pellet of roasting gained, intensity lower than the pellet quality content of 1000N lower than 10%.
Improve the intensity of pellet, decrease the percentage of damage of pellet in stove and Pulverization ratio, improve the ventilation property of stock column.
Preferably, in second step, in blast furnace during cloth, the α angle of outer shroud ore is 30 ° ~ 35 °, and the α angle of inner ring ore is 23 ° ~ 28 °.
Compared with the Strand Feeding Technique adopting low ratio pellet blast furnace ironmaking in prior art, the α angle of improvement Strand Feeding Technique outer-loop ore provided by the invention reduces 2 °, the α angle of inner ring ore increases 2 °, after the pellet ratio avoided in the total ore of stove improves, make due to the easy rollability of pellet into the total ore of stove more cloth to blast furnace edge and center, block normal Gas Flow passage.
Preferably, in second step, in blast furnace during cloth, the quality proportioning 0.2 ~ 0.4% of nut coke and ore.Above-mentioned processing requirement improves the ventilation property of ore layer in blast furnace, adds simultaneously due to nut coke the rolling preventing pellet, ensure that the exact distributing of ore.
Preferably, in second step, during low silicon smelting, the air port area of blast furnace is 0.13 ~ 0.156m
2, air port length is 280 ~ 450mm, and air port downtilt angles is 5 ° ~ 8 °.
During low silicon smelting process, compared with the air intake technology adopting low ratio pellet blast furnace ironmaking in prior art, the air port area of blast furnace reduces 10%-15%, such as: 400m
3level blast furnace is 0.130m
2~ 0.135m
2, 600m3 level blast furnace is 0.148m
2~ 0.156m
2; Air port length increases by 45 ~ 55mm, such as: 400m
3level blast furnace is 280mm ~ 310mm, 600m
3level blast furnace is 400mm ~ 450mm.
Compared with the air intake technology adopting low ratio pellet blast furnace ironmaking in prior art, after improvement air intake technology provided by the invention prevents the pellet ratio in the total ore of stove to improve, because the ore at the cupola well center that permeability of stock column is deteriorated and pellet rolls to blast furnace center and causes is piled up, ensure that the evenly active of cupola well.
More than the slag content of MgO to 9.0% of low silicon smelting gained, MgO/Al
2o
3reach more than 0.70.Ensure that in blast furnace to have sufficient cupola well heat, slag has good mobility, ensure that the sweetening power that slag is good.Final employing technical solution of the present invention low silicon smelting gained silicon content in hot metal is 0.25 ~ 0.45%.
Present invention process is simple, and to adopting the technique of low ratio pellet blast furnace ironmaking to improve in prior art, all the other processing parameters all can refer in prior art and adopt the technique of low ratio pellet blast furnace ironmaking to carry out high proportion pellet ore blast furnace ironmaking.
Existing blast furnace iron-making process generally adopts agglomerate and general acidic pellet (what have also adds part lump ore) to arrange in pairs or groups into stove, temperature is started low because general acidic pellet is softening, frequent less than 900 DEG C (the softening temperature that starts of high basicity sinter is at about 1200 DEG C), reflowing temperature interval is wide, reduction swellability rate is high, these can cause breathability of stock column for blast furnace obviously to reduce, the rollability of adding pellet is good, be difficult to realize precise positioning in stove, therefore the rising of pelletizing ratio can cause blast furnace to occur suppressing wind, avalanche material, hanging, the phenomenon that even Gas Flow is not normal, the present invention is by optimizing pelletizing batching, improve the measures such as maturing temperature, improve the high temperature metallurgical properties of pellet, improve its softening beginning temperature, reduce its reduction swellability, make its high temperature metallurgical properties close with agglomerate, and by improving blast furnace material distribution system, in ore bed, mix the measures such as nut coke suppresses pelletizing to roll, realize exact distributing, pass through low silicon smelting as much as possible again, reduce cohesive zone height in stove, improve permeability of stock column, thus the reduction of the blast furnace stable smooth operation realized under high pelletizing ratio and energy consumption.Ensure that the steady running of blast furnace in smelting process, improve production efficiency and the economic benefit of enterprise.
Compared with prior art, tool has the following advantages in the present invention:
1) pellet is stabilized in more than 45% with addition of ratio entering the quality in the total ore of stove, can reach 55%, solves the problem of agglomerate insufficient raw material in production;
2) by the preparation technology's requirement adopting the technique of low ratio pellet blast furnace ironmaking to improve in prior art and to pellet nature, the direct motion degree of blast furnace in iron manufacturing process is improved gradually;
3) in iron manufacturing process, compared with the technique adopting low ratio pellet blast furnace ironmaking in prior art, the ratio of fuel and ore drops to current 530Kg/t from 538Kg/t, reduces 8Kg/t, reduces energy consumption;
4) compared with the technique adopting low ratio pellet blast furnace ironmaking in prior art, the iron quality smelting gained improves, and average Si content is reduced to 0.42%, S stable content 0.23%.
Embodiment
below in conjunction with specific embodiment, the invention will be further described.
embodiment 1
Use a blast furnace iron-making process for high pellet ratio, step is as follows:
The first step, prepare pellet:
By iron ore concentrate, wilkinite, mix by proportioning of the prior art containing the material of MgO, and by adding one or more in Mg-high andesite, high magnesium ore deposit or steel-smelting sewage sludge, the content of MgO of regulation and control mixing raw material, makes its content of MgO be greater than 2.5%, SiO
2content is lower than 5.5%, Na
2o and K
2the total content of O is less than 0.1%, ZnO < 0.05%; The raw material prepared is made the green-ball that granularity is Φ 8mm, and be not less than the roasting temperature of 1150 DEG C, gained pellet strength reaches more than 2200N, wherein intensity lower than the pellet quality content of 1000N lower than 10%.
Second step, 400m
3level blast-furnace smelting:
The ore being 45% by the first step gained pellet quality content puts into blast furnace, and during cloth, the quality proportioning of nut coke and ore is 0.02%, 30 °, the α angle of outer shroud ore, 23 °, the α angle of inner ring ore;
Then low silicon smelting is carried out, in the air intake process of low silicon smelting, the air port area 0.130m of blast furnace
2, air port length is 310mm, and air port downtilt angles is 5 °, final that Si content is the pig iron of 0.35%.
In this enforcement, blast furnace ironmaking process steady running.
More than the slag content of MgO to 9.0% of low silicon smelting gained, MgO/Al
2o
3reach more than 0.70.
Except above-mentioned processing requirement, all the other blast furnace iron-making process parameters all can refer in prior art the processing parameter adopting low ratio pellet blast furnace ironmaking.
embodiment 2
use a blast furnace iron-making process for high pellet ratio, step is as follows:
The first step, prepare pellet:
By iron ore concentrate, wilkinite, mix by proportioning of the prior art containing the material of MgO, and by adding one or more in Mg-high andesite, high magnesium ore deposit or steel-smelting sewage sludge, the content of MgO of regulation and control mixing raw material, makes its content of MgO be greater than 2.5%, SiO
2content is lower than 5.5%, Na
2o and K
2the total content of O is less than 0.1%, ZnO < 0.05%; The raw material prepared is made the green-ball that granularity is Φ 14mm, and be not less than the roasting temperature of 1150 DEG C, gained pellet strength reaches more than 2200N, wherein intensity lower than the pellet quality content of 1000N lower than 10%.
Second step, 600m
3level blast-furnace smelting:
The ore being 55% by the first step gained pellet quality content puts into blast furnace, during cloth, the quality proportioning of nut coke and ore is 0.4%, compared with the Strand Feeding Technique adopting low ratio pellet blast furnace ironmaking in prior art, 35 °, the α angle of outer shroud ore, 28 °, the α angle of inner ring ore;
Then low silicon smelting is carried out, in the air intake process of low silicon smelting, the air port area 0.156m of blast furnace
2, air port length is 450mm, and air port downtilt angles is 8 °, final that Si content is the pig iron of 0.45%.
In this enforcement, blast furnace ironmaking process steady running.
More than the slag content of MgO to 9.0% of low silicon smelting gained, MgO/Al
2o
3reach more than 0.70.
Except above-mentioned processing requirement, all the other blast furnace iron-making process parameters all can refer in prior art the processing parameter adopting low ratio pellet blast furnace ironmaking.
embodiment 3
use a blast furnace iron-making process for high pellet ratio, step is as follows:
The first step, prepare pellet:
By iron ore concentrate, wilkinite, mix by proportioning of the prior art containing the material of MgO, and by adding one or more in Mg-high andesite, high magnesium ore deposit or steel-smelting sewage sludge, the content of MgO of regulation and control mixing raw material, makes its content of MgO be greater than 2.5%, SiO
2content is lower than 5.5%, Na
2o and K
2the total content of O is less than 0.1%, ZnO < 0.05%; The raw material prepared is made the green-ball that granularity is Φ 11mm, and be not less than the roasting temperature of 1150 DEG C, gained pellet strength reaches more than 2200N, wherein intensity lower than the pellet quality content of 1000N lower than 10%.
Second step, 400m
3level blast-furnace smelting:
The ore being 50% by the first step gained pellet quality content puts into blast furnace, and during cloth, the quality proportioning of nut coke and ore is 0.3%, compared with the Strand Feeding Technique adopting low ratio pellet blast furnace ironmaking in prior art, the α angle of outer shroud ore is 33 °, for, the α angle of inner ring ore is 25 °;
Then low silicon smelting is carried out, in the air intake process of low silicon smelting, compared with the air intake technology adopting low ratio pellet blast furnace ironmaking in prior art, the air port area 0.135m of blast furnace
2, air port length 280mm, air port downtilt angles is 7 °, final that Si content is the pig iron of 0.4%.
In this enforcement, blast furnace ironmaking process steady running.
More than the slag content of MgO to 9.0% of low silicon smelting gained, MgO/Al
2o
3reach more than 0.70.
Except above-mentioned processing requirement, all the other blast furnace iron-making process parameters all can refer in prior art the processing parameter adopting low ratio pellet blast furnace ironmaking.
Claims (3)
1. use a blast furnace iron-making process for high pellet ratio, comprise pellet preparation and blast-furnace smelting step, it is characterized in that,
The first step, prepare pellet:
By iron ore concentrate, wilkinite, to mix by a certain percentage containing the material of MgO and make content of MgO in mixture be greater than 2.5%, SiO
2content is lower than 5.5%, Na
2o and K
2the total content of O is less than 0.1%, ZnO < 0.05%; The raw material prepared is made the green-ball that granularity is Φ 8 ~ 14mm, and be not less than the roasting temperature of 1150 DEG C, gained pellet strength reaches more than 2200N;
Second step, blast-furnace smelting: the ore being 45% ~ 55% by the first step gained pellet quality content puts into blast furnace, and cloth, low silicon smelting, obtain the pig iron; During cloth, the α angle of outer shroud ore is 30 ° ~ 35 °, and the α angle of inner ring ore is 23 ° ~ 28 °, the quality proportioning 0.2 ~ 0.4% of nut coke and ore; During low silicon smelting, the air port area of blast furnace is 0.13 ~ 0.156m
2, air port length is 280 ~ 450mm, and air port downtilt angles is 5 ° ~ 8 °.
2. a kind of blast furnace iron-making process using high pellet ratio as claimed in claim 1, is characterized in that: in the first step, and during batching, by adding in Mg-high andesite, high magnesium ore deposit or steel-smelting sewage sludge, one or more regulate and control content of MgO in raw materials.
3. a kind of blast furnace iron-making process using high pellet ratio as claimed in claim 1, is characterized in that: in the first step, in the pellet of roasting gained, intensity lower than the pellet quality content of 1000N lower than 10%.
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| CN106119449B (en) * | 2016-08-26 | 2018-10-16 | 河钢股份有限公司 | A kind of blast furnace whole world group smelting process |
| CN106987705A (en) * | 2017-02-27 | 2017-07-28 | 唐山钢铁集团有限责任公司 | Blast furnace high simatic fluxed pelletses and its production method |
| CN109355448B (en) * | 2018-11-13 | 2020-09-25 | 包头钢铁（集团）有限责任公司 | Smelting process for large blast furnace with high-proportion low-silicon high-magnesium fluorine-containing fluxing pellets |
| CN111286567B (en) * | 2020-03-03 | 2022-05-10 | 首钢京唐钢铁联合有限责任公司 | Control method and system for improving pellet ratio in blast furnace smelting |
| CN111363871A (en) * | 2020-03-04 | 2020-07-03 | 首钢京唐钢铁联合有限责任公司 | Coal gas control method in blast furnace smelting |
| CN112251551A (en) * | 2020-10-12 | 2021-01-22 | 王玉平 | High-proportion magnesium pellet blast furnace iron-smelting method and automatic distributor arranged on blast furnace |
| CN113265496B (en) * | 2021-02-07 | 2023-01-31 | 首钢集团有限公司 | Blast furnace iron-making method using full-acid pellets as raw materials |
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| CN102010920A (en) * | 2010-12-24 | 2011-04-13 | 宝钢集团新疆八一钢铁有限公司 | Method for smelting bell-less top blast furnace high proportion pellet ore burden structure |
| CN102409170A (en) * | 2010-09-20 | 2012-04-11 | 鞍钢股份有限公司 | High-mechanical strength carbon-containing pellets for blast furnace and production method for high-mechanical strength carbon-containing pellets |
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| CN102409170A (en) * | 2010-09-20 | 2012-04-11 | 鞍钢股份有限公司 | High-mechanical strength carbon-containing pellets for blast furnace and production method for high-mechanical strength carbon-containing pellets |
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Non-Patent Citations (1)
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