CN107164631B - Method and system for improving air permeability of iron ore sintering mixture - Google Patents
Method and system for improving air permeability of iron ore sintering mixture Download PDFInfo
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- CN107164631B CN107164631B CN201710524226.5A CN201710524226A CN107164631B CN 107164631 B CN107164631 B CN 107164631B CN 201710524226 A CN201710524226 A CN 201710524226A CN 107164631 B CN107164631 B CN 107164631B
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- 238000005245 sintering Methods 0.000 title claims abstract description 89
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 46
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 43
- 239000000203 mixture Substances 0.000 title claims abstract description 29
- 230000035699 permeability Effects 0.000 title abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 51
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 238000005453 pelletization Methods 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000009423 ventilation Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 11
- 239000012752 auxiliary agent Substances 0.000 claims description 9
- 230000004907 flux Effects 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000002347 injection Methods 0.000 description 16
- 239000007924 injection Substances 0.000 description 16
- 238000009826 distribution Methods 0.000 description 11
- 238000010793 Steam injection (oil industry) Methods 0.000 description 7
- 238000005469 granulation Methods 0.000 description 4
- 230000003179 granulation Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000003034 coal gas Substances 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000009766 low-temperature sintering Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method and a system for improving the air permeability of an iron ore sintering mixture. The method comprises the following steps: preparing iron ore sintering raw materials, mixing, separating 10-50 wt% of materials from the iron ore sintering raw materials, briquetting, and granulating the rest materials; and sintering the briquetted material and the pelletized material together. The system comprises a batching unit, a mixing unit, a granulating unit, a briquetting unit and a sintering unit; the inlet of the mixing unit is connected with the outlet of the batching unit, and the outlet of the mixing unit is respectively connected with the inlet of the granulating unit and the inlet of the briquetting unit; the outlet of the granulating unit and the outlet of the briquetting unit are respectively connected with the inlet of the sintering unit. The technical scheme provided by the invention can effectively improve the average grain diameter of the sintering mixture, improve the air permeability index of the mixture, improve the sintering material layer to 800-1000mm, and effectively improve the sintering production efficiency.
Description
Technical field
The present invention relates to a kind of method and system for improving iron ore sintering mixture ventilation, belong to iron ore sintering skill
Art field.
Background technique
Deep bed sintering low-temperature sintering technology is the advanced sintering technology being generally used in recent years.Based on calcium ferrite consolidation theory
And the auto accumulation heat effect of sintering process, deep-bed sintering can achieve reduction solid fuel consumption, reduce oxycarbide discharge,
Burning tape thickness is reduced, sinter ferrous content is reduced, promotes the generation of calcium ferrite, improves sinter mineral structure, improves and burns
The advantages that tying mine intensity, improving sinter yield rate.But after sinter bed reaches certain thickness, bed permeability will be brought
It is deteriorated, sintering velocity reduces, and the superfusion of lower layer's sinter leads to problems such as physicochemical property be deteriorated.Therefore, how further to mention
High bed depth, and Sintering Operation Index index can be improved, it is significant to sintering development.And bed permeability improvement is then
The key that can bed depth further increase,
So-called permeability of sintering material bed refers to the size for the resistance that the sintered compound bed of material passes through gas, is sintering process
In important technological parameter.Flow condition and changing rule of the gas in sinter bed influence the mass transfer of sintering process, heat transfer
And physical-chemical reaction, directly determine vertical sintering speed.Permeability of sintering material bed is good, the air capacity being passed through in sinter bed
Sufficiently, it is beneficial to the progress of each physical-chemical reaction of sinter bed.
Therefore, the bed permeability technical problem urgently to be resolved as this field how is improved.
Summary of the invention
In order to solve the above technical problems, the purpose of the present invention is to provide a kind of raising iron ore sintering mixture ventilations
Method and system.Technical solution provided by the invention can substantially change the granularmetric composition and average grain diameter of mixture, improve
Its porosity, to improve the gas permeability of sinter mixture.
In order to achieve the above objectives, the present invention provides a kind of method for improving iron ore sintering mixture ventilation, the party
Method the following steps are included:
Iron ore sintering raw material is prepared, the iron ore sintering raw material includes Iron Ore Powder, flux, fuel and cold returns mine；
After iron ore sintering raw material is carried out mixed processing, the material for therefrom separating 10-50wt% carries out briquetting processing, with
It is compressed into agglomerate, rest materials carry out pelletization treatment；
Material after briquetting treated material and pelletization treatment is sintered together, until sintering process terminates.
The gas permeability of sinter bed is influenced by bed structure to a certain extent, its improvement is hindered bed of material gas is reduced
Power, improve bed permeability have the function of it is very big, the research of the invention finds that: determine that the major parameter of bed structure mixes for granulation
The granularmetric composition of material and the average grain diameter of mixture are closed, average grain diameter is bigger, and the range of size distribution is narrower, then between particle
Gap it is more (porosity high), air-flow is easy to pass through, and the gas permeability of the bed of material is better.Using technical solution provided by the invention from
The material that 10-50wt% is separated in iron ore sintering raw material carries out briquetting processing, is pressed into agglomerate, rest materials carry out at granulation
Reason, is then sintered the average grain diameter that can effectively improve material together, reduces the range of size distribution.
In the above-mentioned methods, it is preferable that after iron ore sintering raw material is carried out mixed processing, therefrom separate 20-30wt%
Material carry out briquetting processing, to be compressed into agglomerate.
In the above-mentioned methods, it is preferable that the granularity of the agglomerate is 6-12mm, and compression strength is 5-10N/, is fallen strong
Spend > 3 times/；It is highly preferred that the shape of the agglomerate is spherical shape or cube shaped, but not limited to this.
In the above-mentioned methods, it is preferable that when carrying out briquetting processing, this method further includes that the step of auxiliary agent is added into material
Suddenly；It is highly preferred that the auxiliary agent includes binder and/or flux, but not limited to this.
In the above-mentioned methods, in the iron ore sintering raw material, Iron Ore Powder, flux, fuel and the cold proportion returned mine do not have
It is particularly limited to；Preferably, in terms of butt, in the iron ore sintering raw material, the mass percentage content of the Iron Ore Powder is
68%, the mass percentage content of the flux is 11.5%, and the quality of fuel degree is 3.8%, described cold
The mass percentage content returned mine is 16.7%.
In the above-mentioned methods, it is preferable that when iron ore sintering raw material is carried out mixed processing, this method further includes to material
In plus the step of water.
In the above-mentioned methods, it is preferable that when rest materials are carried out pelletization treatment, this method further includes injecting into material
The step of steam.
In the technical solution provided by the present invention, the material after briquetting treated material and pelletization treatment is carried out together
When sintering, the mixtures of materials material after briquetting treated material and pelletization treatment enters the mixture buffering of sintering machine head end together
Storehouse, and after through cloth, igniting, complete sintering production.
The present invention also provides a kind of systems for improving iron ore sintering mixture ventilation, which includes charger sheet
Member, mixed cell, pelletization unit, briquetting unit and sintering unit；Wherein, the entrance of the mixed cell and the dosing
Outlet be connected, the outlet entrance phase with the entrance of the pelletization unit and the briquetting unit respectively of the mixed cell
Even；The outlet of the pelletization unit and the outlet of the briquetting unit are connected with the entrance of the sintering unit respectively.
In above system, it is preferred that the sintering unit includes igniter and gas injection apparatus；The igniting dress
It sets and is connected with the gas injection apparatus.
In above system, it is preferred that the sintering unit further includes distribution device, and the distribution device can be used for spreading
Glove material.
In above system, it is preferred that the sintering unit further includes surge bunker.Material to be sintered is introduced into surge bunker,
Through cloth, igniting after and, sintering process is completed.
In above system, it is preferred that the system further includes steam injection unit, the outlet point of the steam injection unit
It is not connected with the pelletization unit and the sintering unit.In a specific embodiment, the steam injection unit go out
Mouth is connected with the entrance of surge bunker in the entrance of the pelletization unit and the sintering unit respectively.
In above system, it is preferred that the system also includes water injection unit, one end of the water injection unit is mixed with described
The entrance for closing unit is connected, and the other end is connected with the outlet of the pelletization unit.When needing to fill the water, the water injection unit can be with
It is filled the water into the mixed cell and the pelletization unit.
In above system, it is preferred that the exit of the mixed cell is equipped with feeding-distribution device；The feeding-distribution device includes
Style three-way distributor, distribution box or belt plow.
In above system, it is preferred that the dosing be equipped with meausring apparatus, the meausring apparatus include weighing belt or
Spiral claims.
In above system, it is preferred that the system also includes auxiliary agent adding unit, the auxiliary agent adding unit with institute
Briquetting unit is stated to be connected.
In above system, it is preferred that the mixed cell includes trommel mixer or vertical mixer；The granulation is single
Member includes drum pelletizer or disc balling machine；The briquetting unit includes high pressure cuber or hydraulic pressure cuber.
Beneficial effects of the present invention:
Technical solution provided by the invention uses briquetting process sinter mixture, effectively changes sinter mixture
Granularmetric composition and average grain diameter, improve the porosity of sinter mixture, to improve the gas permeability of sinter mixture；Finally
The thickness for improving sinter bed improves sintering production efficiency.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the system for raising iron ore sintering mixture ventilation that embodiment 1 provides；
Fig. 2 is a kind of structural schematic diagram of the system for raising iron ore sintering mixture ventilation that embodiment 2 provides；
Fig. 3 is that embodiment 3 provides the process flow chart for improving the method for iron ore sintering mixture ventilation；
Main Reference label declaration:
1: dosing；2: mixed cell；3: pelletization unit；4: briquetting unit；5: sintering unit；6: air injection dress
It sets；7: coal gas injection device；8: igniter；9: steam injection unit；10: water injection unit；11: auxiliary agent adding unit.
Specific embodiment
In order to which technical characteristic of the invention, purpose and beneficial effect are more clearly understood, now to skill of the invention
Art scheme carries out described further below, but should not be understood as that limiting the scope of the invention.
Embodiment 1
Embodiment provides a kind of system (as shown in Figure 1) for improving iron ore sintering mixture ventilation.
The system includes dosing 1, mixed cell 2, pelletization unit 3, briquetting unit 4 and sintering unit 5；Wherein, it mixes
Close unit 2 entrance be connected with the outlet of dosing 1, mixed cell 2 export respectively with the entrance and briquetting of pelletization unit 3
The entrance of unit 4 is connected；The outlet of pelletization unit 3 and the outlet of briquetting unit 4 are connected with the entrance of sintering unit 5 respectively；
The exit that mixed cell 2 is connected with pelletization unit 3 and briquetting unit 4 respectively is equipped with feeding-distribution device；Sub-material dress
It sets and can be style three-way distributor, distribution box or belt plow.
Dosing 1 is equipped with weighing belt or spiral claims, for weighing iron ore sintering raw material；
Mixed cell 2 can be trommel mixer or vertical mixer；
Pelletization unit 3 can be drum pelletizer or disc balling machine；
Briquetting unit 4 can be high pressure cuber or hydraulic pressure cuber；
The entrance and exit of system each unit provided in this embodiment can be connected by belt conveyor, constitute sintering life
Producing line.
Embodiment 2
Embodiment provides a kind of system (as shown in Figure 2) for improving iron ore sintering mixture ventilation, which is
Further improvement obtains on the basis of the system that embodiment 1 provides.
On the basis of the system that embodiment 1 provides, which can also include water injection unit 10, and water injection unit 10 is distinguished
It is connected with the entrance of the entrance of mixed cell 2 and pelletization unit 3；
The system can also include auxiliary agent adding unit 11；The outlet of auxiliary agent adding unit 11 and the entrance of briquetting unit 4
It is connected；
The system can also include steam injection unit 9, the outlet of steam injection unit 9 respectively with pelletization unit 3 and burn
Statement of account member 5 is connected；
Sintering unit 5 may include surge bunker, igniter 8, air injection device 6, coal gas injection device 7 and cloth dress
It sets；Wherein, the outlet of steam injection unit 9 is connected with the entrance of surge bunker, and air injection device 6 and coal gas injection device 7 divide
It is not connected with igniter 8.
Embodiment 3
A kind of method (process is as shown in Figure 3) for improving iron ore sintering mixture ventilation is present embodiments provided, it should
Method uses the system that embodiment 2 provides, and mainly comprises the steps that
Iron ore sintering raw material is weighed and prepared using dosing 1, which includes Iron Ore Powder, melts
It agent, fuel and cold returns mine；Then mixed cell 2 is delivered to by sealing-tape machine to be mixed, it can be single by water filling in mixed process
Member 10 adds water into material；
After mixing, the group for being pressed into 8cm diameter is entered in briquetting unit 4 by the material that feeding-distribution device separates 50wt%
Block；Remaining material, which enters in pelletization unit 3, pelletizes, and can be added by water injection unit 10 into material in pelletization
Water；
Material after briquetting treated material and pelletization treatment is delivered to together in sintering unit 5 and is sintered, is obtained
Finished product, when sintering, sintering negative pressure is 10kPa, and firing temperature is 1150 DEG C, sinter bed with a thickness of 1000mm.
Sintering finished rate reaches 84.5%, and drum strength 67.53%, usage factor is 1.567t/ (m2H), vertically
Sintering velocity is 20.22mmmin-1。
Using traditional handicraft (conventional process flow are as follows: ingredient --- mixing --- granulation --- be sintered) to identical iron ore
Stone raw materials for sintering is handled, and is finally 10kPa in sintering negative pressure, and firing temperature is tested under conditions of being 1150 DEG C,
The thickness of sinter bed is only 700mm.Sintering finished rate only reaches 78.5%, drum strength 64.24%, and usage factor is
1.324t/(m2H), vertical sintering speed 21.72mmmin-1。
As can be seen from the results, compared with traditional handicraft, the thickness of sinter bed improves 300mm in the present embodiment, utilizes system
Number improves about 18%.
Embodiment 4
A kind of method for improving iron ore sintering mixture ventilation is present embodiments provided, this method can be using implementation
The system that example 1 or 2 provides, mainly comprises the steps that
Iron ore sintering raw material is weighed and prepared using dosing 1, which includes Iron Ore Powder, melts
It agent, fuel and cold returns mine；Then mixed cell 2 is delivered to by sealing-tape machine to be mixed, it can be single by water filling in mixed process
Member 10 adds water into material；
After mixing, the group for being pressed into 8cm diameter is entered in briquetting unit 4 by the material that feeding-distribution device separates 30wt%
Block；Remaining material, which enters in pelletization unit 3, pelletizes, and can be added by water injection unit 10 into material in pelletization
Water；
Material after briquetting treated material and pelletization treatment is delivered to together in sintering unit 5 and is sintered, is obtained
Finished product, when sintering, system sintering negative pressure is 10kPa, and firing temperature is 1150 DEG C, sinter bed with a thickness of 800mm.
Sintering finished rate reaches 80.78%, and drum strength 66.77%, usage factor is 1.448t/ (m2H), vertically
Sintering velocity is 21.66mmmin-1。
Identical iron ore sintering raw material is handled using traditional handicraft, is finally 10kPa, igniting in sintering negative pressure
Temperature is tested under conditions of being 1150 DEG C, and the thickness of sinter bed is only 700mm.Sintering finished rate only reaches
78.5%, drum strength 64.24%, usage factor is 1.324t/ (m2H), vertical sintering speed 21.72mmmin-1。
As can be seen from the results, compared with traditional handicraft, the thickness of sinter bed improves 100mm in the present embodiment, utilizes system
Number improves about 9%.
Claims (7)
1. a kind of method for improving iron ore sintering mixture ventilation, method includes the following steps:
Iron ore sintering raw material is prepared, the iron ore sintering raw material includes Iron Ore Powder, flux, fuel and cold returns mine；Wherein, In
In the iron ore sintering raw material, the mass percentage content of the Iron Ore Powder is 68%, and the mass percent of the flux contains
Amount is 11.5%, and the quality of fuel degree is 3.8%, and the cold mass percentage content returned mine is
16.7%；
After iron ore sintering raw material is carried out mixed processing, the material for therefrom separating 10-50wt% carries out briquetting processing, by it
It is pressed into agglomerate, rest materials carry out pelletization treatment；
Material after briquetting treated material and pelletization treatment is sintered together, until sintering process terminates.
2. according to the method described in claim 1, wherein, the granularity of the agglomerate is 6-12mm, compression strength is 5-10N/,
Drop strength > 3 time/.
3. according to the method described in claim 1, wherein, the shape of the agglomerate is spherical or cube shaped.
4. method according to claim 1-3, wherein when carrying out briquetting processing, this method further includes to object
The step of auxiliary agent is added in material.
5. according to the method described in claim 4, wherein, the auxiliary agent includes binder and/or flux.
6. according to the method described in claim 1, wherein, when iron ore sintering raw material is carried out mixed processing, this method is also wrapped
Include the step of adding water into material.
7. according to the method described in claim 1, wherein, when rest materials are carried out pelletization treatment, this method further includes to object
The step of steam is injected in material.
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| CN201710524226.5A CN107164631B (en) | 2017-06-30 | 2017-06-30 | Method and system for improving air permeability of iron ore sintering mixture |
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| CN108754130A (en) * | 2018-06-15 | 2018-11-06 | 浙江大学 | A kind of method and system improving iron ore sintering bed gas permeability |
| CN110484717A (en) * | 2019-09-18 | 2019-11-22 | 四川省达州钢铁集团有限责任公司 | A kind of sintering method and sintering equipment |
| BR102021018716B1 (en) * | 2021-09-20 | 2023-04-04 | Tecnored Desenvolvimento Tecnologico S.A | COLD-PRESSED SOLID AGGLOMERATE, AND ITS PRODUCTION PROCESS |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114201A (en) * | 2013-02-06 | 2013-05-22 | 中南大学 | Agglomeration method for iron containing dust slime of iron and steel plants |
| CN103305690A (en) * | 2013-06-25 | 2013-09-18 | 中南大学 | Pre-pressing forming and intensified sintering method of fine iron ore concentrate |
| CN206902200U (en) * | 2017-06-30 | 2018-01-19 | 中冶京诚工程技术有限公司 | System for improving air permeability of iron ore sintering mixture |
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| WO2015152112A1 (en) * | 2014-04-01 | 2015-10-08 | Ｊｆｅスチール株式会社 | Device for manufacturing pelletized sinter feed |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103114201A (en) * | 2013-02-06 | 2013-05-22 | 中南大学 | Agglomeration method for iron containing dust slime of iron and steel plants |
| CN103305690A (en) * | 2013-06-25 | 2013-09-18 | 中南大学 | Pre-pressing forming and intensified sintering method of fine iron ore concentrate |
| CN206902200U (en) * | 2017-06-30 | 2018-01-19 | 中冶京诚工程技术有限公司 | System for improving air permeability of iron ore sintering mixture |
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