CN106282546B - A kind of smoke gas circulating type prereduction sintering process - Google Patents
A kind of smoke gas circulating type prereduction sintering process Download PDFInfo
- Publication number
- CN106282546B CN106282546B CN201510305331.0A CN201510305331A CN106282546B CN 106282546 B CN106282546 B CN 106282546B CN 201510305331 A CN201510305331 A CN 201510305331A CN 106282546 B CN106282546 B CN 106282546B
- Authority
- CN
- China
- Prior art keywords
- sintering machine
- sintering
- coal fuel
- flue gas
- powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000005245 sintering Methods 0.000 title claims abstract description 144
- 238000000034 method Methods 0.000 title claims abstract description 75
- 239000000779 smoke Substances 0.000 title claims abstract description 22
- 230000008569 process Effects 0.000 title description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 100
- 239000003245 coal Substances 0.000 claims abstract description 58
- 239000000446 fuel Substances 0.000 claims abstract description 56
- 239000000843 powder Substances 0.000 claims abstract description 52
- 229910052742 iron Inorganic materials 0.000 claims abstract description 48
- 239000000203 mixture Substances 0.000 claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 28
- 238000005453 pelletization Methods 0.000 claims abstract description 26
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 18
- 239000008188 pellet Substances 0.000 claims abstract description 17
- 230000004907 flux Effects 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003546 flue gas Substances 0.000 claims description 80
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 77
- 239000007789 gas Substances 0.000 claims description 37
- 229910052698 phosphorus Inorganic materials 0.000 claims description 32
- 239000011574 phosphorus Substances 0.000 claims description 32
- 229910052760 oxygen Inorganic materials 0.000 claims description 25
- 239000001301 oxygen Substances 0.000 claims description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 24
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 15
- 239000000428 dust Substances 0.000 claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 10
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 9
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 8
- 230000003009 desulfurizing effect Effects 0.000 claims description 8
- 239000002817 coal dust Substances 0.000 claims description 7
- 239000000571 coke Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- 239000001110 calcium chloride Substances 0.000 claims description 5
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 206010021143 Hypoxia Diseases 0.000 claims description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 4
- 208000018875 hypoxemia Diseases 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 239000002912 waste gas Substances 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000011343 solid material Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 235000019504 cigarettes Nutrition 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims 2
- 238000002485 combustion reaction Methods 0.000 claims 1
- 239000012141 concentrate Substances 0.000 abstract description 6
- 230000009467 reduction Effects 0.000 description 20
- 239000000463 material Substances 0.000 description 17
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 10
- 238000009770 conventional sintering Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000000292 calcium oxide Substances 0.000 description 6
- 235000012255 calcium oxide Nutrition 0.000 description 6
- 230000035699 permeability Effects 0.000 description 6
- 239000012071 phase Substances 0.000 description 6
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 3
- 239000011324 bead Substances 0.000 description 3
- 238000007596 consolidation process Methods 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 239000012716 precipitator Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 239000008896 Opium Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- -1 also Substances 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000007630 basic procedure Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052635 ferrosilite Inorganic materials 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000010450 olivine Substances 0.000 description 1
- 229910052609 olivine Inorganic materials 0.000 description 1
- 229960001027 opium Drugs 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical compound [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 description 1
- 238000011165 process development Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- 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
- Y02P10/25—Process efficiency
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
A kind of iron ore smoke gas circulating type prereduction sintering method, this method include：1) match the pelletizing of carbon in obtaining pelletizing after Iron concentrate and coal fuel mixing；2) dispensing is carried out with iron ore powder, flux and coal fuel powder, then, addition water is mixed to obtain sinter mixture in primary mixer；3) pelletizing by interior with carbon, sinter mixture and additional coal fuel fine powder mix in second drum mixer, obtain prereduction sinter mixture, wherein：The amount ratio (wt) of sinter mixture, carbon-burdened pellet and additional coal fuel powder is 50-70:28-48:1-5；4) prereduction sinter mixture is arranged into progress smoke gas circulating type prereduction sintering on pallet；It is cooled down under conditions of anoxybiotic with 5) sintered prereduced sinter.
Description
Technical field
The present invention relates to a kind of smoke gas circulating type prereduction sintering process of iron ore.
Background technology
Based on blast furnace iron-making process, sinter accounts for the 70%~90% of feed stock for blast furnace, sintering circuit energy consumption in China at present
The 10%~15% of ironmaking energy consumption is accounted for, there are high energy consumption, pollutes the problems such as big, utilization rate of waste heat is low.Conventional sintering technological process
As shown in Figure 1, traditional iron ore sintering process mainly provides heat as fuel using coke powder and anthracite as sintering process, using pumping
The mode of wind sintering, produces using calcium ferrite as the high basicity sinter of Binder Phase.
Chinese patent CN101343689B, CN101608256B, CN101921909B, CN102127636B,
CN102676797B and Chinese patent disclose the preparation method that CN103911507A discloses sinter.
In addition, CN1940092A and CN100532579C disclose the preparation of pre-reduced pellet.
The country uses sintering flue gas currently in order to increase yield and realization energy-saving and emission-reduction in the sintering plants such as peaceful steel and Sha Gang
Internal-circulation type is sintered scheme, and interior circulation technology is temperature is higher, O by newly-increased exhaust fan2Content is higher, SO2The lower wind of content
Case flue gas directly be pumped into newly set pipeline without enter original flue, using after multi-tube dusting or supplement fresh air or with ring it is cold
Circulating flue gas mixing in a mixer, and enter in the hood of pallet face, participate in sintering process again by the bed of material.It is right therewith
What is answered is a kind of sintering flue gas outer circulation type sintering scheme, and external circulation process is on the basis of conventional sintering process, by O2Content
Higher, SO2The flue gas of the lower a certain flue of content is drawn after main exhauster by circulating fan, using gravitational dust collection or rotation
After wind dedusting with the fresh oxygen-enriched air of supplement or with ring cold machine exhaust gas mixing in a mixer, and enter pallet face hood
It is interior, participate in sintering process again by the bed of material.Both sintering flue gases recycle mode may be implemented to a certain extent it is energy saving
Emission reduction, but flue gas recirculation rate is low, the reason is as follows that：Experimental study and production practices prove, in order to ensure that the yield and quality of sinter refers to
Mark requires, and the oxygen content being sintered in air cannot be below 16%~18%, and the oxygen content in sintering flue gas is only 13%
Left and right, so when carrying out flue gas recirculation, if not with addition of oxygen-enriched air or pure oxygen, flue gas recirculation rate be less than 35% hereinafter, even if
Using oxygen-enriched or pure oxygen, 50% or so can only be also recycled.) current production application shows that energy-saving effect is not obvious, technique skill
It need further perfect in art, therefore obtains large-scale promotion application not yet.
Refer to the concept of prereduction in the prior art, but only localized design or imagination.Still currently as one kind
The new technology of non-industrial applications also contains metallic iron and iron oxide in the sinter that prereduction sintering process is produced, is used for
Has the function of reduced iron in blast furnace.
Currently, more stringent requirements are proposed to sintering production for energy-saving and emission-reduction and environmental protection, existing sintering production technology tool
There is the defects of high energy consumption, smoke discharge amount is big, and desulphurization cost is high.In order to adapt to the needs of sintering production, burnt using flue gas recirculation
Knot technology, from watershed management, on the one hand, the sensible heat and latent heat in flue gas can be utilized；On the other hand, flue gas can be reduced
Discharge capacity, reduce desulphurization cost.
The shortage and (reduction of the coke as the skeleton and direct reduction reactor of the bed of material of blast fumance STRENGTH ON COKE demand of coke
Agent) contradiction constrain long flow iron-smelting process development and large blast furnace production raw material gas permeability is proposed it is higher
It is required that.In order to enhance the vitality of long flow iron-smelting process, using prereduction sintering technology so that part reduction deoxidation process
It is completed in sintering, can not only reduce the consumption of coke, but also prereduced sinter porosity is high, improve the ventilative of the bed of material
Property, contribute to the raising of large blast furnace productivity.
In addition, phosphorus is as one of the main harmful element in steel smelting procedure, it is necessary to remove, but steel produces work at present
Skill can only in ore dressing and steelmaking process dephosphorization, this is the main reason for high-phosphorus iron ore utilization of resources of rich reserves is difficult,
If being capable of direct dephosphorization, influence of the reduction phosphorus to subsequent handling equipment and product quality, it will help high in sintering process
The utilization of ferrophosphorus ore resources.
For disadvantages described above, this patent is sintered based on the prior art by merging flue gas recirculation sintering and prereduction
Two kinds of technologies have developed a kind of smoke gas circulating type prereduction sintering process and device, can solve above-mentioned face to a certain extent
The technical barrier faced.
Invention content
Existing prereduction sintering technology is still in concept and phase of basic research, without a set of specific embodiment, in advance
Flue gas after reduction contains higher CO, and brings difficulty to follow-up fume treatment；And existing flue gas recirculation sintering technology is not
The cycling rate of only flue gas is low, and effects of energy saving and emission reduction is also very limited, and economic benefit is not notable；In addition, existing traditional sintering techniques are
Sintering process is completed under a kind of oxidizing atmosphere, it is impossible to realize the direct dephosphorization of high-phosphorus iron ore.
For above-mentioned existing sintering technology there are the shortcomings that, the present invention proposes a kind of smoke gas circulating type prereduction agglomerant
Skill, it is intended to restore the phosphorus in high-phosphorus iron ore with carbon in can also being utilized while producing prereduced sinter.In the prior art
Direct Reduction in, fosfosiderite is reduced into gas P2, Fe is generated again after touching metallic iron2P, therefore in existing skill
Do not have the effect for matching carbon dephosphorization in of the present invention in art.And in the technique of the present invention, interior carbon bead of matching can be high
Fosfosiderite carbon-burdened pellet, the phosphorus in bead are reduced into gas P2Afterwards, it is diffused into outside pelletizing in time, what is contacted is
Sinter (not having metallic iron) and weak oxide atmosphere (oxygen content is relatively low, generally below 10%), it is ensured that phosphorus
Removing.In addition, the present invention by the way of flue gas recirculation sintering, realizes the enrichment and recycling of phosphor resource, and efficiently profit
With the sensible heat and latent heat in flue gas, achieve the purpose that resources effective utilization and energy-saving and emission-reduction.
The present inventor shows that prereduced sinter is reached in reduction degree by theoretical calculation and results of laboratory
When to 40%~60%, blast furnace fuel ratio can be down to 450kg/t hereinafter, ironmaking cost will be greatly reduced, while CO2Emission reduction will surpass
Cross 10%.
Since the flue gas after prereduction contains higher CO, its method of solution of the invention is exactly flue gas recirculation sintering,
The CO latent heat in flue gas can also be utilized, energy consumption is reduced, avoids the influence to follow-up fume treatment.In addition, the present invention can be with
It is recycled using most flue gas, because the technique is in order to ensure outside material inside weak oxide and pelletizing also Primordial Qi
Atmosphere, it is lower to the oxygen content requirement for being sintered gas, it is burnt using small air quantity and lower negative pressure sintering processing, and to prereduction
The intensity requirement of knot mine also reduces, because of the liquid phase of the consolidation mechanism of prereduced sinter, mainly ferrosilite and calcium silicates, with
And the liquid bonding phase of part calcium ferrite；And conventional sintering is mainly the liquid bonding phase of calcium ferrite, and it is high to be substantially also impossible to production
The prereduced sinter of intensity.And blast fumance is also lower to the intensity requirement of prereduced sinter, is sintered using prereduction
When mine is as blast furnace burden, solve the problems, such as that upper blast furnace low temperature reduction degradation, loss of strength greatly reduce, while prereduction
Sinter has flourishing porosity, and to ensure that the gas permeability of the bed of material, this is also to be given birth to using blast furnace when prereduced sinter
The basic reason that yield improves.
Embodiment according to the present invention, provides a kind of iron ore prereduction sintering method, and this method includes：
1) by iron ore powder (such as fine iron breeze, such as common iron ore or high-phosphorus iron ore) and coal fuel (such as coke powder or
Coal dust) after mixing pelletizing (such as disk pelletizing or pressure ball) and match the pelletizing of carbon in obtaining, wherein：The weight ratio of coal and mine be
0.08~0.35:1 (wt), preferably 0.1~0.3:1 (wt), more preferable 0.15~0.2:The range of 1 (wt), pelletizing average diameter
In 3~15mm, preferably 4~11mm, more preferable 5~8mm；
2) dispensing, the wherein use of iron ore powder, flux and coal fuel are carried out with iron ore powder, flux and coal fuel powder
Amount is than being 75-85:10-15:3-6；Then, water (such as the 5- based on solid material total weight is added in primary mixer
9wt%, such as 7wt%) it is mixed to obtain sinter mixture；
3) interior pelletizing, the middle sinter mixture obtained of step 2) and the additional coal with carbon that are obtained in step 1) are fired
Material fine powder is mixed in second drum mixer, obtains prereduction sinter mixture, wherein：Sinter mixture, carbon-burdened pellet
Amount ratio (pressing wt) with additional coal fuel fine powder is 50-70:28-48:1-5, preferably 53-65:34-46:1.2-
3；More preferable 55-62:36-43:1.5-2.5；With
4) prereduction sinter mixture is arranged on the pallet of sintering machine and carries out prereduction sintering (preferably, progress
Smoke gas circulating type prereduction is sintered, and is more preferably sintered under lower negative pressure, small air quantity).Here lower negative pressure refers to being equivalent to
Normal sintering negative pressure (such as -14 to -17.2KPa) 70%~90% negative pressure (such as -11KPa is to -15KPa, such as -11.2
To -14.4KPa).Small air quantity described here refers to 80%~90% air quantity (such as the 72m for being equivalent to conventional air quantity3/
(m2.min) to 81m3/(m2.min))。
Preferably, the bottom of sintering machine has such as 20-32 (such as 24-28) bellows.
Preferably, the above method further includes：
5) the sintered sinter of prereduction under conditions of anoxybiotic (i.e. in hypoxemia (such as 0.1-3vol%) or the item of anaerobic
Under part) it is cooled down.Preferably, cooling using inert gas (such as nitrogen) in pot type cooler.
In step 1), in general, using the water of wetting amount (such as based on solid material during preparing pelletizing
The 5-9wt% of total weight, such as 7wt%).
In step 2), in general, coal fuel is the mixing of both coke powder or coke powder and coal dust, also, coal fires
The weight ratio of material and iron ore powder is 3~10: 75~85, preferably 4~6: 75~85.
Generally, the smoke gas circulating type prereduction in step 4), which is sintered, refers to：Several wind from sintering machine head or front end
Case (such as the 3rd to the 12nd bellows, such as the 3-10 bellows) and several bellows (examples from sintering machine tail portion (or rear end)
Such as inverse the 1st to 8th bellows reciprocal) flue gas as circulating flue gas, circulating flue gas after simple gravitational dust collection or
After being dusted using the first deduster (8) (such as using cyclone dust collector (8) carry out cyclone dust removal after) with it is oxygen-enriched
Air (5) mixes and forms mixing air, returns to sintering machine later for being sintered.
Generally, in step 2) in primary mixer with addition of coal fuel quantity (wt) account for the coal fuel in step 2)
The 75-90wt%, preferably 78-85wt% of the sum of the dosage (wt) of additional coal fuel fine powder in powder and step 3).This is attached
The coal fuel fine powder added is used to improve the flammability of fuel.In addition, those skilled in the art are based on heat balance principle and most preferably
Water distribution and with carbon experiment can determine this match carbon ratio.
In addition, for the carbon ratio of matching in step 2) and step 3), ratio is added in the coal fuel later stage can be by further
Commerical test determine, such as consider the factors such as granulating process, bed permeability, bed depth.For example, sintered compound
Material granularity is thicker, and bed permeability is better, and bed depth is thicker, and coal fuel later stage addition ratio is then higher, otherwise lower.
The dosage of iron ore powder is then the requirement based on prereduction pellet intensity in step 2) because main intensity according to
The requirement of the outer liquid bonding phase and prereduced sinter reduction degree for wrapping up in sinter mixture generation, generally requires reduction degree to exist
40%~60% is advisable, this mostlys come from the reduction of carbon-burdened pellet.
Generally, the grade of the particle of 90% or more the coal fuel fine powder requirement used in step 3) is less than 1mm, preferably
Less than 0.6mm, more preferably less than 0.4mm.
Generally, the iron ore material for the iron ore powder being used to prepare in step 1) is various ironmaking commonly used in the prior art
Raw material, for example, it is to be selected from：Iron ore concentrate, such as common magnetite concentrate or high phosphorus iron ore concentrate.
In this application, flux is one or more (such as two in lime stone, dolomite, quick lime, serpentine
Kind or three kinds).Generally, CaO and SiO is controlled in sinter preparation process2Weight ratio be 1.0~2.5:1.
In the sintering step of step 4), to before sintering machine hood after the ignition furnace (1) of sintering machine (4), using sealing
It covers (2) all to cover, and keeps being tiny structure (such as -50-5Pa) in seal closure.Sintering machine usually has such as 20-32
(preferably 24-28) bellows (bottom for being located at sintering machine), wherein from sintering machine head (or front end) several bellows (such as
3rd to the 12nd bellows, such as the 3rd to the 10th bellows) and several bellows from sintering machine tail portion (or rear end) (such as fall
Number the 1st is to 8th bellows reciprocal) flue gas as circulating flue gas.Circulating flue gas mixed with oxygen-enriched air (5) after dedusting and
Mixing air is formed, is entered later in seal closure (2) for being sintered.That is, circulating flue gas after dedusting with oxygen-enriched air (5)
It mixes and forms mixing air, be entered in seal closure (2).Sintering machine middle part bellow and lighting section bellows (such as the 1st and the 2nd
Bellows) flue gas it is lower into being handled in the second deduster (10) and desulfurizing tower (12) in main exhauster (11) effect, processing
Flue gas afterwards is discharged.Preferably, it especially when the raw material of use is high-phosphorus iron ore, needs to increase after carrying out flue gas desulfurization
Add a phosphorus collector (13).The phosphorus collector (13) is closed water circulating cooling case, and wherein cooling water flows through its inside
Pipeline.Indirect heat exchange is carried out with cooling water so that phosphorus steam is deposited to the cold at solid state of phosphorous when flue gas flows through collector (13)
Product arrives cooler bin bottom, to realize the recycling to high-phosphorus iron ore phosphor resource.Phosphorus collector (13) is used for being embedded in flue gas
Phosphorus simple substance recycle.It is preferred that the second deduster (10) is electric precipitator or electricity+cloth bag complex dust collector.
In step 5), it is preferred that use inert gas such as nitrogen in the sinter pot type cooler (7) after prereduction
Cooling, in order that preventing the secondary oxidation of prereduced sinter, high-temp waste gas after cooling is used for cogeneration, cogeneration
Cooling of the exhaust gas recycling for sinter afterwards.In order to avoid prereduced sinter after cooling occurs again in transportational process
Problem of oxidation, it is preferred that spray or spray certain to prereduced sinter (surface) in the exit of pot type cooler (7)
Calcium chloride solution or the calcium hydroxide solution for measuring (such as 0.5-6wt% based on sinter dry weight) are (such as dense with 0.5-5wt%
Degree, preferably 1-4wt% concentration, the solution form of more preferable 2-3wt% concentration).Spray the purpose of calcium chloride：It can be in prereduction
The surface of sinter forms thin film, prevents prereduced sinter re-oxidation in transportational process, can also reduce sintering
Low temperature reduction degradation index of the mine in upper blast furnace.Spray the purpose of calcium hydroxide：It can be covered on the surface of prereduced sinter
One layer of white lime compares calcium chloride film, and protective layer is more stablized, is fine and close, to prevent prereduced sinter in transportational process
Re-oxidation.
Thickness of feed layer is 500~1000mm, preferably 750-900mm after cloth.
It is 2.5~4.5m/min that conventional sintering process, which is in sintering pallet machine speed, vertical sintering speed is 20~
40mm/min, mixture temperature are 35~80 DEG C, and sintering negative pressure is -14KPa~-17.2KPa, and sintering air quantity is 90 ± 5m3/
(m2.min), exhaust gas temperature is sintered under the conditions of being 100~150 DEG C.
Another embodiment according to the present invention, provide in the above method device or a kind of iron ore prereduction
Sintering equipment, the device include：Sintering machine (4)；Ignition furnace (1) positioned at the front end of sintering machine (4)；Positioned at sintering machine (4)
Seal closure (2) above pallet；Flue gas recirculation main line (L1)；Towards the large flue pipeline (L2) of blowdown stack；It is oxygen-enriched
Air pipe line (L3)；For mixing the circulating flue gas conveyed via flue gas recirculation main line (L1) and via air pipe line (L3)
The mixing chamber (3) of the oxygen-enriched air conveyed；With the pot type cooler (7) of sinter.
It is preferred that above-mentioned apparatus further comprises：The first deduster (8) for being set on flue gas recirculation main line (L1) and draw
Wind turbine (9)；With the second deduster (10), main exhauster (11), desulfurizing tower or the desulfurization dress being set on large flue pipeline (L2)
Set (12) and phosphorus collector (13).It is preferred that the first deduster (8) is cyclone dust collectors and the second deduster (10) is electric precipitator
Or electricity+cloth bag complex dust collector.
In this application, it is preferred that sintering machine (4) has 20-32, preferably 22-30, more preferable 24-28 wind
Case (bottom for being located at sintering machine).Sintering machine head or front end several bellows (such as the 3rd to the 12nd bellows, the such as the 3rd to the
10 bellows) and sintering machine tail portion or rear end the respective flue gas of several bellows (such as inverse the 1st to the 8th bellows reciprocal)
Output branch pipe is connected to flue gas recirculation main line (L1).
It is preferred that middle part bellows (such as the 11st or the 13rd bellows) and lighting section bellows (such as the 1st He of sintering machine (4)
2nd bellows) respective flue gas output branch is connected to large flue pipeline (L2).
In this application, the technological process and operating duty that do not illustrate are carried out according to conventional sintering method.
In this application, " optionally " indicate carry out or without." optional " indicate to be with or without.
Sintering machine used in this application is the sintering machine of routine in the prior art.
Compared with the prior art, advantageous effects of the invention：
1, a kind of smoke gas circulating type prereduction sintering process (technique basic procedure is as shown in Figure 2) of Integrated Development, the work
Skill realizes recycling for sintering flue gas while obtaining prereduced sinter, achieves energy-saving and emission reduction purposes, can also locate
High-phosphorus iron ore is managed, the direct dephosphorization of high-phosphorus iron ore is completed.
2, by conventional sintering mixture, carbon-burdened pellet and need the later stage add it is levigate after fuel in second drum mixer
Middle addition improves the flammability of carbon-burdened pellet outer fuel, is to ensure that prereduction sinter mixture has good gas permeability
Obtain high intensity, the important leverage of high reduction degree prereduced sinter.
3, on the basis of conventional sintering, the small air quantity sintering of lower negative pressure is carried out, sintering wind is essentially from circulating flue gas and richness
Oxygen air controls the usage factor of sinter in 0.8~1.0t/ (m2.h) left and right.It can be in the height of the conventional sintering bed of material
Thickness of feed layer is further increased, realizes super deep-bed sintering, the basicity for reducing sinter is needed, improves the ratio of silica,
For example increase a certain proportion of serpentine, to increase the liquid phase of sinter and improve the intensity of prereduced sinter and metallurgical
Energy.
(conventional sintering, consolidation style are mainly：Fe2O3+ CaO=CaOFe2O3(calcium ferrite)
4, in the technique of the present invention, consolidation style is：It is interior to form metallic iron crystal stock with the crystallization that carbon bead is metallic iron
Body, and generate part low melting point olivine phase；Following react then occurs for external sinter：SiO2+ CaO=CaOSiO2(silicon
Sour calcium)；Fe2O3+ CaO=CaOFe2O3(calcium ferrite) mainly generates a certain amount of liquid phase (change of formation by above-mentioned reaction
It is all low-melting compound to close object), in cool down the viscous of sinter and pellet is realized using this Partial Liquid Phase
Knot, to obtain the prereduced sinter of higher-strength.
5, furthermore it is possible to use super deep-bed sintering, on the one hand, in order to give full play to the auto accumulation heat effect of the bed of material, section
Fuel consumption-saving；On the other hand, prereduction sinter mixture has good gas permeability, this be realize super deep-bed sintering must
Want condition).
Description of the drawings
Fig. 1 is the sintering process flow chart of the prior art.
Fig. 2 is apparatus of the present invention structure chart.
Reference numeral：1- ignition furnaces, 2- seal closures, 3- mixing chambers, 4- sintering machines, 5- oxygen-enriched air, 6- cooling air-flows
Output pipe (Waste Heat Recovery utilization), 7- pot type coolers, the first dedusters of 8-, 9- air-introduced machines, the second dedusters of 10-, 11- master
Exhaust fan, 12- desulfurizers, 13- phosphorus collectors, 14- chimneys；L1- flue gas recirculation main lines, L2- large flue pipelines, L3- are rich
Oxygen air pipe line.
Fig. 3 is the schematic diagram of phosphorus collector 13.
1301- gas inlets end, 1302- smoke outlets, 1303- cooling water inlets end, 1304- cooling water outlets end,
Outlet elemental phosphorous 1305-.
Specific implementation mode
In a specific embodiment using a kind of iron ore prereduction sintering equipment, which includes：Sintering machine 4；It is located at
The ignition furnace 1 of the front end of sintering machine 4；Seal closure 2 above the pallet of sintering machine 4；Flue gas recirculation main line L1；It is logical
Toward the large flue pipeline L2 of blowdown stack；Oxygen-enriched air pipeline L3；It is conveyed via flue gas recirculation main line L1 for mixing
Circulating flue gas and mixing chamber 3 via the air pipe line L3 oxygen-enriched air conveyed；With the pot type cooler 7 of sinter.
It is preferred that above-mentioned apparatus further comprises：The deduster 8 and air-introduced machine 9 being set on flue gas recirculation main line L1；
With deduster 10, main exhauster 11, desulfurizing tower or desulfurizer 12 and the phosphorus collector 13 being set on large flue pipeline L2.
It is preferred that sintering machine 4 has 20-32, preferably 24-28 bellows (bottom for being located at sintering machine).Sintering machine head
Or front end several bellows (such as the 3rd to the 12nd bellows, such as the 3rd to the 10th bellows) and sintering machine tail portion or rear end
The flue gas output branch pipe of several bellows (such as inverse the 1st to the 8th bellows reciprocal) is connected to flue gas recirculation main line L1.
It is preferred that the middle part bellows (such as the 11st or the 13rd bellows) and lighting section bellows the (such as the 1st and the 2nd of sintering machine 4
Bellows) flue gas output branch be connected to large flue pipeline L2.
Embodiment 1
A kind of iron ore smoke gas circulating type prereduction sintering method includes the following steps：
1) pressure ball or disk pelletizing side will be passed through after iron ore powder (i.e. v-ti magnetite concentrate) and coke powder (or coal dust) mixing
Formula carrys out pelletizing, obtains the interior pelletizing for matching carbon, and wherein coal mine ratio is 0.18:1 (wt), pelletizing average diameter are 6mm；
2) iron ore powder (i.e. common Iron Ore Powder, can be fine ore, can also be the mixture of fine ore and concentrate), flux are used
(it includes the mixture of three kinds of raw lime stone, lime stone and serpentine raw materials；The amount ratio of these three raw materials makes in sinter system
CaO and SiO is controlled during standby2Weight ratio be about 1.2:1) and coke blacking carries out dispensing (obtaining butt material), wherein
The amount ratio of iron ore powder, flux and char fuel is 83:12:5；Then, addition is based on butt material in primary mixer
The water of the 7wt% of total weight is mixed to obtain sinter mixture,
3) interior pelletizing, the middle sinter mixture obtained of step 2) and the additional coal with carbon that are obtained in step 1) are fired
Material fine powder (grade of 90% or more particle is less than 0.4mm) is mixed in second drum mixer, and it is mixed to obtain prereduction sintering
Material is closed, wherein：The amount ratio (pressing wt) of sinter mixture, carbon-burdened pellet and additional coal fuel fine powder is 58:40:2；
4) as shown in Figure 2, by prereduction sinter mixture be arranged into sintering machine 4 (bottom of the sintering machine 4 have 24
Bellows) pallet on carry out smoke gas circulating type prereduction sintering, and be sintered under lower negative pressure, small air quantity.Here
Lower negative pressure refer to be equivalent to normal sintering negative pressure 80% negative pressure (such as -12.8KPa).Small air quantity described here refers to
It is equivalent to the air quantity (76.5m of the 85% of conventional air quantity3/(m2.min))；With
5) the sintered sinter of prereduction under conditions of anoxybiotic (i.e. in hypoxemia (such as 0.1-3vol%) or the item of anaerobic
Under part), it is cooled down using nitrogen in pot type cooler 7.In the exit of cooler to the surface spraying one of prereduced sinter
Quantitative calcium chloride or calcium hydroxide (such as with solution form of 0.5-5wt% concentration) reduce transportational process prereduction sintering
Mine reoxidizes.
In addition, in step 1), water (the i.e. butt object based on step 1 of wetting amount is used during preparing pelletizing
Expect the 7wt% of total weight).
Wherein, the following progress of smoke gas circulating type prereduction sintering in step 4)：From sintering machine head or front end
3rd to the 10th bellows and inverse the 1st from sintering machine tail portion or rear end to the 8th bellows reciprocal flue gas as cycle
Flue gas, via flue gas recirculation main line L1 conveying circulating flue gas by first deduster 8 (i.e. cyclone dust collectors) dedusting it
It is mixed afterwards with the oxygen-enriched air 5 conveyed from oxygen-enriched air pipeline L3 and forms mixing air, return to sintering machine 4 later for burning
Knot.
Thickness of feed layer is 850mm or so after cloth on pallet.
In the sintering step of step 4), to before sintering machine hood after the ignition furnace (1) of sintering machine (4), using sealing
It covers (2) all to cover, and keeps being tiny structure (such as -50 to -5Pa) in seal closure.
It is 3.5~4.0m/min, vertical sintering speed 30mm/min, mixing that sintering process, which is in sintering pallet machine speed,
Material temperature degree is 40~50 DEG C, and sintering negative pressure is -13KPa, and sintering air quantity is 72m3/(m2.min), exhaust gas temperature is 120 DEG C of conditions
Under be sintered.
The cigarette of sintering machine middle part bellow (i.e. the 11st extremely 9th reciprocal) and lighting section bellows (such as the 1st and the 2nd bellows)
Gas enters via large flue pipeline L2 in the second deduster 10 (i.e. electric precipitator) and desulfurizing tower 12 under the effect of main exhauster 11
It is handled, treated, and flue gas is discharged.
In step 5), the sinter after prereduction is cooled down in pot type cooler 7 using nitrogen, to prevent prereduction from burning
The secondary oxidation of mine is tied, high-temp waste gas after cooling, which is transported in afterheat generating system, is used for cogeneration, and cogeneration
Exhaust gas afterwards is recycled to the cooling that sinter is used in pot type cooler 7.In the exit of cooler to prereduced sinter
A certain amount of calcium chloride or calcium hydroxide (such as in the form of aqueous solution of 0.5-5wt% concentration) are sprayed, it is pre- to reduce transportational process
Reduction sinter reoxidizes.
For the reduction degree of the prereduced sinter obtained in 40%~45% range, this mostlys come from carbon-burdened pellet
Reduction.
Due to using common fine iron breeze in the present embodiment 1, collected without increasing a phosphorus on large flue pipeline L2
Device 13.
Embodiment 2
Embodiment 1 is repeated, Carbon-containing Pellets are only made instead of fine iron breeze using high-phosphorus iron ore powder.In opium deferent
Increase a phosphorus collector 13 on the L2 of road.Pellet in phosphorus content and prereduced sinter by analyzing high-phosphorus iron ore powder
Phosphorus content, the dephosphorization rate for measuring pellet are 75wt%.
Comparative example 1 (prior art)
Repeat embodiment 1.According to the technique described in CN102127636B.
Effect data
Claims (30)
1. a kind of iron ore smoke gas circulating type prereduction sintering method, this method include：
1) match the pelletizing of carbon in obtaining pelletizing after iron ore powder and coal fuel mixing, wherein：Coal and mine ratio 0.08~
0.35:The range of 1 (wt), pelletizing average diameter is in 3~15mm；
2) dispensing, the wherein amount ratio of iron ore powder, flux and coal fuel are carried out with iron ore powder, flux and coal fuel powder
For 75-85:10-15:3-6；Then, water is added in primary mixer to be mixed to obtain sinter mixture；
3) sinter mixture and additional coal fuel of acquisition in the interior pelletizing with carbon obtained in step 1), step 2) is thin
Powder is mixed in second drum mixer, obtains prereduction sinter mixture, wherein：Sinter mixture, carbon-burdened pellet and attached
The amount ratio (wt) of the coal fuel fine powder added is 50-70:28-48:1-5；With
4) prereduction sinter mixture is arranged into progress smoke gas circulating type prereduction sintering on the pallet of sintering machine (4).
2. according to the method described in claim 1, it is characterized in that：
1) match the pelletizing of carbon in obtaining pelletizing after iron ore powder and coal fuel mixing, wherein：Coal and mine ratio 0.1~
0.3:The range of 1 (wt), pelletizing average diameter is in 4~11mm；
2) dispensing, the wherein amount ratio of iron ore powder, flux and coal fuel are carried out with iron ore powder, flux and coal fuel powder
For 75-85:10-15:3-6；Then, water is added in primary mixer to be mixed to obtain sinter mixture, wherein adding
It is the 5-9wt% based on solid material total weight to add the amount of water；
3) sinter mixture and additional coal fuel of acquisition in the interior pelletizing with carbon obtained in step 1), step 2) is thin
Powder is mixed in second drum mixer, obtains prereduction sinter mixture, wherein：Sinter mixture, carbon-burdened pellet and attached
The amount ratio (wt) of the coal fuel fine powder added is 53-65:34-46:1.2-3；With
4) prereduction sinter mixture is arranged into progress smoke gas circulating type prereduction sintering on the pallet of sintering machine (4),
Sintering carries out under lower negative pressure, small air quantity；The bottom of sintering machine has 20-32 bellows.
3. according to the method described in claim 2, it is characterized in that：
Coal described in step 1) is with mine ratio 0.15~0.2:The range of 1 (wt), pelletizing average diameter is in 5~8mm；
The amount ratio (wt) of sinter mixture, carbon-burdened pellet and additional coal fuel fine powder is 55-62 in step 3):36-
43:1.5-2.5；With
The bottom of sintering machine has 24-28 bellows in step 4).
4. method according to any one of claim 1-3, this method further include：
5) the sintered sinter of prereduction is cooled down under conditions of hypoxemia or anaerobic；Inertia is used in pot type cooler
Gas cooling.
5. according to the method described in claim 4, it is characterized in that：
5) the sintered sinter of prereduction is cooled down under conditions of hypoxemia or anaerobic；Nitrogen is used in pot type cooler
It is cooling.
6. according to the method described in any one of claim 1-3 or 5, wherein in step 2), coal fuel is coke powder or coke
The mixing of both powder and coal dust；And/or
Wherein, the smoke gas circulating type prereduction in step 4), which is sintered, refers to：It several bellows from sintering machine front end and comes from
For the flue gas of several bellows of sintering machine rear end as circulating flue gas, circulating flue gas is after simple gravitational dust collection or is utilizing
One deduster (8) mixed with oxygen-enriched air (5) after cyclone dust removal and form mixing air, returns to sintering machine later and is used for
Sintering.
7. according to the method described in claim 4, wherein in step 2), coal fuel is both coke powder or coke powder and coal dust
Mixing；And/or
Wherein, the smoke gas circulating type prereduction in step 4), which is sintered, refers to：It several bellows from sintering machine front end and comes from
For the flue gas of several bellows of sintering machine rear end as circulating flue gas, circulating flue gas is after simple gravitational dust collection or is utilizing
One deduster (8) mixed with oxygen-enriched air (5) after cyclone dust removal and form mixing air, returns to sintering machine later and is used for
Sintering.
8. according to the method described in claim 6, wherein in step 2), coal fuel is both coke powder or coke powder and coal dust
Mixing, also, the weight ratio of coal fuel and iron ore powder is 4~6: 75~85；And/or
Wherein, the smoke gas circulating type prereduction in step 4), which is sintered, refers to：The the 3rd to the 12nd bellows from sintering machine front end with
And the flue gas of the inverse the 1st from sintering machine rear end to 8th bellows reciprocal is used as circulating flue gas, circulating flue gas simply weighing
It is mixed after power dedusting or with oxygen-enriched air (5) after carrying out cyclone dust removal using the first deduster (8) and forms mixing sky
Gas returns to sintering machine for being sintered later.
9. according to the method described in claim 7, wherein in step 2), coal fuel is both coke powder or coke powder and coal dust
Mixing, also, the weight ratio of coal fuel and iron ore powder is 4~6: 75~85；And/or
Wherein, the smoke gas circulating type prereduction in step 4), which is sintered, refers to：The the 3rd to the 12nd bellows from sintering machine front end with
And the flue gas of the inverse the 1st from sintering machine rear end to 8th bellows reciprocal is used as circulating flue gas, circulating flue gas simply weighing
It is mixed after power dedusting or with oxygen-enriched air (5) after carrying out cyclone dust removal using the first deduster (8) and forms mixing sky
Gas returns to sintering machine for being sintered later.
10. according to the method described in any one of claim 1-3 or 5, wherein in step 2) in primary mixer with addition of
Coal fuel quantity (wt) account for the sum of the dosage (wt) of coal fuel fine powder in the coal fuel powder in step 2) and step 3)
75-90wt%.
11. according to the method described in claim 4, wherein in step 2) in primary mixer with addition of coal fuel quantity
(wt) 75-90wt% of the sum of the coal fuel powder in step 2) and the dosage (wt) of coal fuel fine powder in step 3) is accounted for.
12. according to the method described in claim 10, wherein in step 2) in primary mixer with addition of coal fuel quantity
(wt) 78-85wt% of the sum of the coal fuel powder in step 2) and the dosage (wt) of coal fuel fine powder in step 3) is accounted for.
13. according to the method for claim 11, wherein in step 2) in primary mixer with addition of coal fuel quantity
(wt) 78-85wt% of the sum of the coal fuel powder in step 2) and the dosage (wt) of coal fuel fine powder in step 3) is accounted for.
14. according to the method described in any one of claim 1-3,5 or 7-9, wherein the coal combustion used in step 3)
Expect that fine powder requires the grade of 90% or more particle to be less than 1mm.
15. according to the method described in claim 4,90% or more the coal fuel fine powder requirement that is wherein used in step 3)
The grade of particle is less than 1mm.
16. according to the method described in claim 6,90% or more the coal fuel fine powder requirement that is wherein used in step 3)
The grade of particle is less than 1mm.
17. according to the method for claim 14, wherein 90% or more the coal fuel fine powder requirement used in step 3)
Particle grade be less than be less than 0.6mm.
18. according to the method described in any one of claim 1-3,5 or 7-9, wherein in the sintering step of step 4),
To before sintering machine hood after the ignition furnace (1) of sintering machine (4), all covered using seal closure (2)；It keeps being micro- in seal closure
Negative pressure.
19. according to the method described in claim 4, wherein in the sintering step of step 4), the ignition furnace in sintering machine (4)
(1) it to before sintering machine hood after, is all covered using seal closure (2)；It keeps being tiny structure in seal closure.
20. according to the method described in claim 6, wherein in the sintering step of step 4), the ignition furnace in sintering machine (4)
(1) it to before sintering machine hood after, is all covered using seal closure (2)；It keeps being tiny structure in seal closure.
21. according to the method for claim 18, wherein sintering machine has 20-32 bellows, wherein coming from sintering machine front end
Several bellows and several bellows from sintering machine rear end flue gas as circulating flue gas, circulating flue gas after dedusting with
Oxygen-enriched air (5) mixes and forms mixing air, is entered later in seal closure (2) for being sintered.
22. according to the method for claim 21, wherein sintering machine has 24-28 bellows, wherein coming from sintering machine front end
The the 3rd to the 12nd bellows and inverse the 1st from sintering machine rear end to the 8th bellows reciprocal flue gas as cycle cigarette
Gas, circulating flue gas mix with oxygen-enriched air (5) after dedusting and form mixing air, are entered in seal closure (2) and use later
In sintering.
23. the method according to claim 21 or 22, the wherein flue gas of sintering machine middle part bellow and lighting section bellows are in master
Enter in the second deduster (10) and desulfurizing tower (12) under exhaust fan (11) effect and handled, treated, and flue gas is discharged.
24. according to the method for claim 23, the 9th bellows and the lighting section extremely reciprocal of the 13rd wherein in the middle part of sintering machine
The flue gases of the 1st and the 2nd bellows enter the second deduster (10) and the middle progress of desulfurizing tower (12) main exhauster (11) effect is lower
Processing, treated, and flue gas is discharged.
25. according to the method described in any one of claim 21,22 or 24, wherein increasing a phosphorus after desulfurizing tower (12)
Collector (13), for being recycled to the phosphorus simple substance being embedded in flue gas.
26. according to the method for claim 23, being used for wherein increasing a phosphorus collector (13) after desulfurizing tower (12)
The phosphorus simple substance being embedded in flue gas is recycled.
27. according to the method described in claim 4, wherein in step 5), the sinter after prereduction is in pot type cooler (7)
Middle to be cooled down using inert gas, high-temp waste gas after cooling is used for cogeneration, and the exhaust gas recycling after cogeneration is used for
The cooling of sinter；Calcium chloride solution is sprayed to prereduced sinter or calcium hydroxide is molten in the exit of pot type cooler (7)
Liquid.
28. according to the method described in claim 5,7, any one of 9, wherein in step 5), the sinter after prereduction
It is cooled down using inert gas in pot type cooler (7), high-temp waste gas after cooling is used for cogeneration, after cogeneration
Cooling of the exhaust gas recycling for sinter；It is molten to prereduced sinter spraying calcium chloride in the exit of pot type cooler (7)
Liquid or calcium hydroxide solution.
29. according to the method for claim 27, it is characterised in that：It is described to be gone back to pre- in the exit of pot type cooler (7)
The calcium chloride solution of former sinter spraying or the aqueous solution that calcium hydroxide solution is 0.5-5wt% concentration.
30. according to the method for claim 28, it is characterised in that：It is described to be gone back to pre- in the exit of pot type cooler (7)
The calcium chloride solution of former sinter spraying or the aqueous solution that calcium hydroxide solution is 0.5-5wt% concentration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510305331.0A CN106282546B (en) | 2015-06-05 | 2015-06-05 | A kind of smoke gas circulating type prereduction sintering process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510305331.0A CN106282546B (en) | 2015-06-05 | 2015-06-05 | A kind of smoke gas circulating type prereduction sintering process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106282546A CN106282546A (en) | 2017-01-04 |
| CN106282546B true CN106282546B (en) | 2018-11-06 |
Family
ID=57659813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510305331.0A Active CN106282546B (en) | 2015-06-05 | 2015-06-05 | A kind of smoke gas circulating type prereduction sintering process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106282546B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6686974B2 (en) * | 2016-06-22 | 2020-04-22 | Ｊｆｅスチール株式会社 | Sintered ore manufacturing method |
| CN107413193B (en) * | 2017-06-13 | 2020-06-02 | 武汉钢铁有限公司 | Sintering flue gas zoned circulating smoke catalytic denitration process |
| CN107519750B (en) * | 2017-08-25 | 2020-03-20 | 钢研晟华科技股份有限公司 | System and method for comprehensive treatment of sintering flue gas |
| CN108159861A (en) * | 2017-12-18 | 2018-06-15 | 中南大学 | A kind of Whole Process Control reduces the method and its device of sintering flue gas NOx emission |
| CN109868361B (en) * | 2019-04-11 | 2023-10-03 | 中冶长天国际工程有限责任公司 | Ring type roasting machine and ring type roasting radial uniform-thickness uniform-distribution device thereof |
| CN110658228B (en) * | 2019-09-30 | 2022-05-20 | 鞍钢股份有限公司 | A pre-reduction sintering cup test device and test method |
| CN113025771B (en) * | 2021-03-05 | 2022-05-17 | 山东大学 | A system and method for producing direct reduced iron by grate type sintering machine |
| CN114807483A (en) * | 2022-04-22 | 2022-07-29 | 中国恩菲工程技术有限公司 | Smelting method and smelting device for high-phosphorus iron ore |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63149331A (en) * | 1986-12-15 | 1988-06-22 | Nkk Corp | Method for producing calcined agglomerate |
| CN1924035A (en) * | 2005-09-01 | 2007-03-07 | 中南大学 | Composite agglomeration technology of iron powdered ore |
| CN101024143A (en) * | 2007-01-12 | 2007-08-29 | 中冶长天国际工程有限责任公司 | Sinter-smoke circulation collected desulfurizing method and apparatus |
| CN101037720A (en) * | 2007-04-28 | 2007-09-19 | 中南大学 | Method for sintering iron ore powder with super high material layer |
| CN101949650A (en) * | 2010-09-25 | 2011-01-19 | 中冶长天国际工程有限责任公司 | Method for treating smoke generated by sintering ore materials |
| CN202465830U (en) * | 2011-12-26 | 2012-10-03 | 济南钢铁股份有限公司 | Residual heat reclaiming system for pellets and sintered ores |
| CN204803377U (en) * | 2015-06-05 | 2015-11-25 | 中冶长天国际工程有限责任公司 | Flue gas recirculation formula prereduction sintering device |
-
2015
- 2015-06-05 CN CN201510305331.0A patent/CN106282546B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63149331A (en) * | 1986-12-15 | 1988-06-22 | Nkk Corp | Method for producing calcined agglomerate |
| CN1924035A (en) * | 2005-09-01 | 2007-03-07 | 中南大学 | Composite agglomeration technology of iron powdered ore |
| CN101024143A (en) * | 2007-01-12 | 2007-08-29 | 中冶长天国际工程有限责任公司 | Sinter-smoke circulation collected desulfurizing method and apparatus |
| CN101037720A (en) * | 2007-04-28 | 2007-09-19 | 中南大学 | Method for sintering iron ore powder with super high material layer |
| CN101949650A (en) * | 2010-09-25 | 2011-01-19 | 中冶长天国际工程有限责任公司 | Method for treating smoke generated by sintering ore materials |
| CN202465830U (en) * | 2011-12-26 | 2012-10-03 | 济南钢铁股份有限公司 | Residual heat reclaiming system for pellets and sintered ores |
| CN204803377U (en) * | 2015-06-05 | 2015-11-25 | 中冶长天国际工程有限责任公司 | Flue gas recirculation formula prereduction sintering device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106282546A (en) | 2017-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106282546B (en) | A kind of smoke gas circulating type prereduction sintering process | |
| KR102134202B1 (en) | Vortex Stirring Method | |
| CN107299181B (en) | Circulating Dephosphorization Steelmaking Method of Converter Gasification Dephosphorization Slag | |
| CN110438277B (en) | A cyclone flash reduction direct steelmaking system and process | |
| CN101260448B (en) | A method of smelting reduction ironmaking directly using concentrate powder | |
| CN103011090B (en) | Method for producing sulfur by using pyrolysis-reducing united technique | |
| CN102010924B (en) | Method for producing directly reduced iron from coal | |
| CN102031361B (en) | Comprehensive treatment and utilization method of iron and steel dust and mud | |
| CN110157846A (en) | A kind of method that steel scrap is added in the big proportion of blast furnace | |
| CN107304460A (en) | A kind of iron ore prereduction sintering method and its device | |
| CN101818263A (en) | A method for recycling dust and mud containing zinc and iron | |
| CN106636508B (en) | A kind of efficient circulation utilizes the iron-smelting process of top gas | |
| CN107419061A (en) | Bottom-blowing of converter dust improve gasification dephosphorization effect method | |
| CN115449579A (en) | A low-carbon smelting reduction ironmaking method and device | |
| CN103146913B (en) | Method for treating iron-containing dust of iron and steel plant by using cupola furnace | |
| CN102399922B (en) | Blast furnace iron making method | |
| CN108754056A (en) | A kind of high density total oxygen short flow high efficiency cleaning iron-smelting process | |
| CN103952540B (en) | Ion dust mud contaning and high silicon iron concentrate is utilized to produce the technique of prereduced burden | |
| CN204803377U (en) | Flue gas recirculation formula prereduction sintering device | |
| CN110372042A (en) | Preparation method of calcium ferrite | |
| CN102277463B (en) | Reduction furnace and device for producing direct reduced iron | |
| CN101914648B (en) | Method for preparing low-phosphorus molten iron by utilizing oxygen-enriched top-blown melting reduction of high-phosphorus iron ore | |
| CN209210894U (en) | Zinc-Bearing Wastes extract secondary zinc oxide device | |
| CN106702065A (en) | Novel system and novel method for preparing sponge iron through gas-based shaft kiln | |
| CN206256095U (en) | The system that a kind of new gas-based shaft kiln prepares sponge iron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |