CN106399606B - The secondary recoverying and utilizing method of returning mine of blast furnace - Google Patents
The secondary recoverying and utilizing method of returning mine of blast furnace Download PDFInfo
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- CN106399606B CN106399606B CN201610450010.4A CN201610450010A CN106399606B CN 106399606 B CN106399606 B CN 106399606B CN 201610450010 A CN201610450010 A CN 201610450010A CN 106399606 B CN106399606 B CN 106399606B
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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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- 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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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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- Manufacture Of Iron (AREA)
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Abstract
The invention discloses a kind of secondary recoverying and utilizing methods of returning mine of blast furnace, comprising the following steps: 1) sieves to secondary return mine, sift out secondary the returning mine of granularity > 3mm；2) secondary return mine sifted out in step 1) is sufficiently mixed into mixture with reuse nut coke for 10: 3~5: 1 ratio in mass ratio；3) mixture in step 2) is added at the intermediate annulus of blast furnace in the ratio that the mining amount of secondary in every batch of furnace charge and every batch of quality of furnace charge ratio are 1: 15~1: 10, enters furnace recycling.The present invention solves successfully by mixture cloth at the intermediate annulus of blast furnace and is easy to influence the development of blast furnace edge airflow using secondary return mine of excessive ratio at blast furnace edge, reduce the problem of blast furnace gas is using reducing；The secondary yield of returning mine of the method for the present invention is big, and recovery efficiency is high, significantly reduces energy consumption, has saved manufacture and transportation cost.
Description
Technical field
The present invention relates to metallurgical technologies, in particular to a kind of secondary recoverying and utilizing method of returning mine of blast furnace.
Background technique
The returning mine of sinter is divided into once returning mine returns mine with secondary.Wherein, when pallet runs to sintering machine tail, sintering
Screenings of the not burned sinter on machine two sides and surface layer after the shearing of tail single roll crusher and heated oscillating screen screening, and heat
Screenings of the sinter after cooling and whole grain, this part is referred to as once returned mine；Sinter is after whole grain, even if granularity all exists
5mm or more, but all can be inevitably crushed in belt operating and discharge process, it is good ventilative to guarantee to have in State of Blast Furnace
Property, sinter will be sieved once before entering blast furnace, sift out granularity less than returning mine for 5mm and return to sintering mill (plant), this part
It is referred to as secondary to return mine.Suitable return mine is incorporated in sintering feed, and permeability of sintering material bed can be improved, and promotes low melting point liquid phase object
It generates, improves sinter strength and desulfurization degree, but the excessively high utilization rate for leading to sinter of sinter return fine rate reduces, solid fuel disappears
Consumption increases, and sintering cost increases, and not can guarantee requirement of the blast furnace to clinker rate.
With the arrival in steel low margin age, domestic many iron and steel enterprises take the strategy of Low cost allocation, sinter product
Position reduces year by year, and the ratio of small sinter increases year by year, and wherein the secondary quantity of return mines of sinter accounts for the 10 of entire sintering output
~18%, it is about 218~3,930,000 t/ by the secondary quantity of return mines of pig iron Production rate for a 15000000 t/a pig iron enterprises of annual output
a.Normal sinter granularity is in 5~40mm, such as certain iron and steel enterprise, and 5~11mm of granularity is small burning, and 11~40mm is big burning, greatly
Small burning is classified into furnace, blast furnace stable smooth operation.10~40mm ratio is secondary to return mine and normally burn about 80% in normal sinter
It is huge to tie mine granularmetric composition gap.Granularity is returned to sintering mill (plant) as sintering paving less than returning mine for 5mm by Jue great Shuo enterprise at present
Bottom material is sintered again, and this mode not only wastes solid burnup, increases manufacturing cost, while also increasing secondary return mine in blast furnace
Transportation cost between mine slot and sintering machine.
Secondary mine granularmetric composition is general are as follows: granularity accounts for 5% greater than 5mm's, and 3~5mm's of granularity accounts for 55%, and granularity is less than
3mm's accounts for 40%, wherein granularity accounts for 60% greater than 3mm's.To improve secondary utilization rate of returning mine, each industrial and mining enterprises have been done greatly
Quantity research.Wherein, Chinese patent application CN201010144395.4 discloses a kind of sintering circular-cooler distributing method and device,
Point three layers of laying sinter on circular cooler trolley, bottom based on big granularity sinter, middle layer based on small sinter,
Top layer is conducive to recycle small sinter based on medium size sinter, but still without solving small grain size sintering
Mine is directly recovered into the problem of furnace substitutes normal sinter.Document " horse steel 2500m3Blast furnace small sinter recycles "
(Ding Hui, Li Bangping " ironmaking " 2 phases in 2002) describe horse steel 2500m3Blast furnace small sinter quantity of return mines reaches 280kg/
T. iron, quantity of return mines is huge, if whole sintering machine production costs are significantly increased, the small sinter of 3~5mm of recovery section,
After 7~9 subnormal material, 1 small sinter of cloth, small sinter recycling amount 26.5kg/t. iron；Document " Ji
No. 1 blast furnace small sinter of steel enters furnace technological development and application " (Li Chuanhui, An Ming " steel " 12 phases in 2007) describe back
The small sinter of 3~5mm of receiving portions, after 6~15 subnormal material, 1 small sinter of cloth, and cloth is at edge；
Document " recycling for climbing the new No. three blast furnace small sinters of steel is practiced " (Lin Chuan " Sichuan metallurgy " 6 phases in 2011) is introduced back
The small sinter of 3~5mm of receiving portions, after the subnormal material of cloth 8,1 small sinter of cloth；Document " reduces Wuhan Iron and Steel Plant to burn
Tie the rate of return mine production practices " (Li Hong, Yu Shanshan, Zheng Junping " Wuhan Iron and Steel Plant technology " 3 phases in 2015) describe Wuhan Iron and Steel Plant take it is suitable
Come when improving a series of measures such as FeO in Sinter, adjustment sintering ignition temperature, Intensified support, adjustment sintered screen size
Sinter return fine rate is reduced, iron-smelter sinter return fine rate is down to 11.5% within 2014, decline 5.9% compared with average of the whole year value in 2011,
The policy of " stabilised edge air-flow, get through central gas stream " is taken in blast furnace material distribution operation.It is mentioned in above-mentioned four documents
Method has the disadvantage that since small sinter and normal sinter particle size differences are big, be easy to cause stock column in furnace empty
Porosity decline, gas permeability are deteriorated, have an adverse effect to blast furnace trouble-free operation, and small sinter amount recovery utilization rate is low.
Summary of the invention
Present invention aim to provide a kind of blast furnace secondary recoverying and utilizing method of returning mine, the secondary recycling of returning mine of this method
Amount is big, and recovery efficiency is high, and blast furnace gas utilization rate is high.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of secondary recoverying and utilizing method of returning mine of blast furnace, packet
Include following steps:
1) secondary return mine is sieved, sifts out secondary the returning mine of granularity > 3mm；
2) secondary return mine sifted out in step 1) is sufficiently mixed with reuse nut coke for 10: 3~5: 1 ratio in mass ratio
At mixture；
3) ratio for being 1: 15~1: 10 in the mining amount of secondary in every batch of furnace charge and every batch of quality of furnace charge ratio is by step 2)
In mixture add at the intermediate annulus of blast furnace, enter furnace recycle.
Further, in the step 3), blast furnace by the way of size sinter grading charging, successively according to coke,
Big burning+pelletizing+lump ore+nut coke+secondary returns mine+reuse nut coke, small burning sequence cloth enter furnace.
Further, in the step 3), blast furnace is taken by the burden distribution matrix of outer ring to inner ring, and the mixture cloth is existed
At the intermediate annulus of blast furnace, and by small burning cloth at edge.
Further, it is true when in the step 2), the mixture being fitted into the ore slot for being ordered as end, and being charged
Protect the top that the mixture concentrates bucket in furnace charge.
Further, in the step 2), secondary return mine with the mass ratio of the reuse nut coke is 10: 3~12:
3.3。
Further, in the step 3), the mining amount of secondary is 1: 11~12: the 125 of furnace charge batch weight in every batch of furnace charge.
Further, in the step 2), the granularity of the reuse nut coke is 16~27mm.
Further, in the step 1), the secondary granularity returned mine is 3~5mm.
Compared with prior art, the invention has the following advantages that
First, it is that the secondary of 3~5mm is returned mine that granularity, which is greatly utilized, in the present invention, with the use of the reuse of coking recycling
Nut coke is greatly utilized existing waste resource, reduces ironmaking cost.
Second, the present invention returns mine and the parameters such as the granularity of reuse nut coke and mixed proportion by the way that optimization is secondary, so that mixing
Expect that permeability index is good, it is suitable in the gas permeability index of intermediate annulus with script furnace charge (being not added with mixture), thus successfully
By mixture cloth at the intermediate annulus of blast furnace, the edge and central gas stream of blast furnace will not influence, solving makes at blast furnace edge
It is easy to influence the development of blast furnace edge airflow with secondary return mine of excessive ratio, reduces the problem of blast furnace gas is using reducing.
Third, secondary return mine mixes the distributing mode of reuse nut coke, the intrinsic gas fluid distrbution shadow that blast furnace is formed for a long time
Sound is small, and blast furnace operating change is small, and type of furnace control is simple, and the secondary use returned mine also inhibits the Gas Flow of intermediate annulus in furnace,
Residence time of the coal gas in furnace is extended, blast furnace gas utilization efficiency is improved, reduces blast furnace energy consumption.
Fourth, the secondary yield of returning mine of the method for the present invention is big, recovery efficiency is high, significantly reduces energy consumption, has saved manufacture
With transportation cost.
Specific embodiment
The present invention is described in further detail combined with specific embodiments below, convenient for more clearly understanding the present invention,
But limiting the invention for they.
Embodiment 1:
No. 8 blast furnaces of certain domestic iron-smelter, increase the bar shaped sieve of 3mm hole under sinter slot, return mine again to secondary
The 10t that returns mine that granularity is 3~5mm is sifted out in screening, and the 3t reuse nut coke which returns mine with granularity is 16~27mm is sufficiently mixed
It closes；
No. 8 blast furnaces choose the batch weight routinely used as 110t；
No. 8 blast furnaces design altogether 9 ore slots, and secondary return mine is fitted into 9B ore slot with after the mixing of reuse nut coke；
No. 8 blast furnaces are by the way of size sinter grading charging, and cloth sequence is successively are as follows: coke, big burning+pelletizing+block
Mine+nut coke+secondary+the reuse nut coke, small burning of returning mine；
The charging matrix that No. 8 blast furnaces use are as follows:Wherein C is coke, OLTo burn greatly, OSIt is small
It burns, upper right number is that (No. 9 Jiao Wei are 46.7 °, and No. 8 Jiao Wei are 44.5 °, and No. 7 Jiao Wei are 42.3 °, and No. 6 Jiao Wei are for cloth angle position
39.9 °, No. 5 Jiao Wei are 37.3 °, and No. 1 Jiao Wei is 5 °), bottom right number is cloth number of rings corresponding with upper right number.
It returns mine the result shows that not only having recycled 55% secondary, and improves coal gas utilization efficiency, significantly reduce energy
Consumption.
Embodiment 2:
No. 8 blast furnaces of certain domestic iron-smelter, increase the bar shaped sieve of 3mm hole under sinter slot, return mine again to secondary
The 12t that returns mine that granularity is 3~5mm is sifted out in screening, is sufficiently mixed with granularity for the reuse nut coke 3.3t of 16~27mm；
No. 8 blast furnaces choose the batch weight routinely used as 125t；
No. 8 blast furnaces design altogether 9 ore slots, secondary to return mine and be fitted into 9B ore slot after mixing with nut coke；
No. 8 blast furnaces are by the way of size sinter grading charging, and cloth sequence is successively are as follows: coke, big burning+pelletizing+block
Mine+nut coke+secondary+the reuse nut coke, small burning of returning mine；
The charging matrix that No. 8 blast furnaces use are as follows:Wherein C is coke, OLTo burn greatly, OSIt is small
It burns, upper right number is that (No. 10 Jiao Wei are 48.8 °, and No. 9 Jiao Wei are 46.7 °, and No. 8 Jiao Wei are 44.5 °, and No. 7 Jiao Wei are for cloth angle position
42.3 °, No. 6 Jiao Wei are 39.9 °, and No. 5 Jiao Wei are 37.3 °, and No. 1 Jiao Wei is 5 °), bottom right number is corresponding with upper right number
Cloth number of rings.
It returns mine the result shows that not only having recycled 55% secondary, and improves coal gas utilization efficiency, significantly reduce energy
Consumption.
Claims (6)
1. a kind of secondary recoverying and utilizing method of returning mine of blast furnace, it is characterised in that: the following steps are included:
1) secondary return mine is sieved, sifts out secondary the returning mine of granularity > 3mm；
2) in mass ratio for 10: 3~5: 1 ratio by sifted out in step 1) it is secondary return mine be sufficiently mixed into reuse nut coke it is mixed
Close material；
It 3) will be in step 2) in the ratio that the mining amount of secondary in every batch of furnace charge and every batch of quality of furnace charge ratio are 1: 15~1: 10
Mixture adds at the intermediate annulus of blast furnace, enters furnace recycling；In the step 3), blast furnace using big granularity sinter and
Small sinter is classified the mode into furnace, successively return mine according to coke, big granularity sinter+pelletizing+lump ore+nut coke+secondary+
Reuse nut coke, small sinter sequence cloth enter furnace；
In the step 3), blast furnace is taken by the burden distribution matrix of outer ring to inner ring, by the mixture cloth blast furnace intermediate ring
At band, and by small sinter cloth at edge.
2. the secondary recoverying and utilizing method of returning mine of blast furnace according to claim 1, it is characterised in that:, will in the step 2)
The mixture is fitted into the ore slot for being ordered as end, and ensures that the mixture concentrates the top of bucket in furnace charge when charging.
3. the secondary recoverying and utilizing method of returning mine of blast furnace according to claim 1 or 2, it is characterised in that: in the step 2),
Secondary return mine with the mass ratio of the reuse nut coke is 10: 3~12: 3.3.
4. the secondary recoverying and utilizing method of returning mine of blast furnace according to claim 1 or 2, it is characterised in that: in the step 3),
The mining amount of secondary is 1: 11~12: the 125 of furnace charge batch weight in every batch of furnace charge.
5. the secondary recoverying and utilizing method of returning mine of blast furnace according to claim 1 or 2, it is characterised in that: in the step 2),
The granularity of the reuse nut coke is 16~27mm.
6. the secondary recoverying and utilizing method of returning mine of blast furnace according to claim 1 or 2, it is characterised in that: in the step 1),
The secondary granularity returned mine is 3~5mm.
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| CN108411056B (en) * | 2018-04-18 | 2020-08-04 | 武汉钢铁有限公司 | Method for using lump ore in blast furnace at large proportion |
| CN109022649B (en) * | 2018-08-24 | 2020-08-04 | 武汉钢铁有限公司 | Blast furnace material distribution method and device |
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| CN105274268B (en) * | 2014-06-11 | 2017-12-05 | 鞍钢股份有限公司 | Mixed charging method for small-granularity sinter and coke |
| CN104131120B (en) * | 2014-07-22 | 2016-04-27 | 武汉钢铁(集团)公司 | Improve the Burden distribution method of blast furnace of agglomerate utilising efficiency |
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Effective date of registration: 20170626 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Applicant after: Wuhan iron and Steel Company Limited Address before: 430083, Wuhan City, Hubei province Wuhan Castle Peak District factory Applicant before: WUHAN IRON AND STEEL CORPORATION |
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