CN104204244B - By the technique and the equipment that produce hardened granules containing iron granules - Google Patents
By the technique and the equipment that produce hardened granules containing iron granules Download PDFInfo
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- CN104204244B CN104204244B CN201380015110.9A CN201380015110A CN104204244B CN 104204244 B CN104204244 B CN 104204244B CN 201380015110 A CN201380015110 A CN 201380015110A CN 104204244 B CN104204244 B CN 104204244B
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- bed reactor
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 239000008187 granular material Substances 0.000 title claims abstract description 63
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims description 50
- 239000000203 mixture Substances 0.000 claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000011230 binding agent Substances 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 230000009467 reduction Effects 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 12
- 239000012298 atmosphere Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 230000001590 oxidative effect Effects 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 2
- 239000003153 chemical reaction reagent Substances 0.000 claims 1
- 238000005299 abrasion Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 17
- 239000000463 material Substances 0.000 description 13
- 239000000428 dust Substances 0.000 description 11
- 235000019580 granularity Nutrition 0.000 description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000003245 coal Substances 0.000 description 9
- 239000012141 concentrate Substances 0.000 description 8
- 239000003638 chemical reducing agent Substances 0.000 description 7
- 230000002349 favourable effect Effects 0.000 description 7
- 239000004531 microgranule Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 238000005453 pelletization Methods 0.000 description 7
- 239000000440 bentonite Substances 0.000 description 6
- 229910000278 bentonite Inorganic materials 0.000 description 6
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000011859 microparticle Substances 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 235000010755 mineral Nutrition 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 235000013980 iron oxide Nutrition 0.000 description 4
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000003763 carbonization Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000003134 recirculating effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229920003043 Cellulose fiber Polymers 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000013590 bulk material Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000011143 downstream manufacturing Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000007885 magnetic separation Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- -1 Excess (excess) Substances 0.000 description 1
- 206010039509 Scab Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 1
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 239000006148 magnetic separator Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002912 waste gas 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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
-
- 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
- C22B1/22—Sintering; Agglomerating in other sintering apparatus
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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)
- Carbon And Carbon Compounds (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
Abstract
Being produced in hardened granules by containing iron granules, by described containing iron granules with least one binding agent and water to obtain mixture, described mixture is formed granule, and described granule is incorporated in fluidized-bed reactor is used for hardening.For reducing the abrasion of working up stage downstream, still moistening described granule is incorporated in described fluidized-bed reactor at the hottest point of fluid bed.
Description
The present invention relates to hardened granules (granule) are produced by iron dust containing, wherein iron dust containing is glued with least one
Mixture and water mix to obtain mixture, mixture is formed granule, introduces the particles into and be used in fluidized-bed reactor hardening,
And make hardened granules experience reduction.
In some reducing process for obtaining metallization ferrum, by iron-bearing materials with fine granularity microgranule (fine-
Grained particle) form introducing.The example of such technique is so-called SL/RN technique, and it is Stelco-Lurgi
Technique and the combination of Republic Steel-National Lead technique (RN).Stelco-Lurgi technique is direct-reduction work
Skill, it initially be directed to sponge iron steel stove produce and be rich in ferrum Ore use.Republic Steel-National
Lead technique is also direct-reduction technique, and iron ore resolves into wherein after reduction their component metals ferrum and stone-like pulse.Just
In this, stone-like pulse is understood to nonferrous rock present in iron ore.By combining two kinds of techniques, developed in 1964
SL/RN technique, wherein uses solid reductant reducing iron oxides in rotary kiln.In a furnace, by Ore or so-called
Green-ball (green pellets) is excessively introduced as reducing agent with coal (particularly brown coal), and introduces dolomite for desulfurization.Will
Stove output cools down in tubular cooler indirectly, hereafter through sieving, magnetic separation separate with mineral coal be divided into sponge iron,
Excess (excess), coal and ash.
In SL/RN technique, generally adopt the lump ore of granularity 5-18mm or the pelletizing (pellets) of 9-16mm.Also make
It is preferably greater than 160 μm of ferrum sand or ilmenite with granularity.Diameter<63 μm of microgranule is not suitable for SL/RN technique, because they are led
Cause sticks (sticking) and thus leads to the formation of kliner coating in rotary kiln (crusts), and they can cause operation interrupted.
Be suitable for this technique in order to still make more little particulate, can be formed with many techniques have desired diameter
Grain.Due to processing and additive (such as binding agent), herein this granule can be designed so that their production period powder
The formation of dirt keep relatively low (<10wt-%).
The granule being aware of fine granularity iron ore part from WO 98/49352A1 is formed, and is wherein made using such as bentonite
For adhesive material.Bentonite is the rock of the mixture containing various clay minerals, montmorillonite be most important component (60 to
80wt-%).
US 6,024,790 describes the ion exchange of the cation by using intercalation, and to activate this adhesive material swollen
Profit soil can be favourable for their intended use.The bentonite of activation generally has more preferable swellbility and higher heat is steady
Qualitative.The time that activating process described in US 6,024,790 must carry out a few hours to several days is handed over guaranteeing enough ions
Change.
It is aware of a small amount of sodium hydroxide of interpolation from JP 63103851 to bentonite, thus activated clay material.
DE 25 175 43 discloses the technique of agglomeration metallurgical dust, wherein bonds metallurgical dust and 2 to 20wt-%
Agent and the mixing of about 0.5 to 5wt-% material, this mixture is formed pelletizing or granule and with after-hardening.Add further
Additive is also known in binding agent, the e.g., from about sodium hydroxide of 3wt-% quantity, sodium carbonate and sodium bicarbonate.
It is aware of by binding agent by the technique carefully containing iron granules production metallized iron agglomerate from EP 1 290 232 B1,
Wherein cellulose fibre is used as binding agent.When forming microgranule, cellulose fibre works as binding agent, but due to it
High-carbon content, they may also used as the reducing agent in downstream reduction technique.
EP 0 916 742 also discloses a kind of technique, introduces reducing agent wherein in iron content particle.For this purpose,
Raw material containing iron oxides is mixed with carbonaceous material, organic bond and inorganic coagulant, subsequently mixes with water.There is provided
Dispersant, thus obtained pelletizing is dried and subsequently reduces.As dispersant, it is possible to use such as sodium hydroxide solution.
However, due to the processing in rotary kiln, together with solid reductant and the considerably long time of staying, when using green-ball
When, it was observed that the shape of increased tiny abrasion in all these techniques, being processed further particularly in SL/RN technique
Become.High abrasion requires high processing charges so as to reclaiming these dust, can produce value product from them.
Otherwise, the material containing in dust just have lost.
Therefore, it is an object of the present invention to provide technique and equipment, produce granule to be used for being processed further, they have
Such hardness is so that even also will not occur noticeable wear in down stream processing steps.
According to the present invention, solve this target with following feature.Ultra-fine Fe concentrate (concentrate) is supplied
Mixed in mixed cell and in this place with least one binding agent and water.Additionally, also can add in this mixed cell
Further aggregation (aggregates).Then by thus obtained mixture in miniature coagulator
(microcoagulator) form granule in.Subsequently introduce the particles in the fluid bed of preferred cycle, this introducing is in fluid bed
Hottest point at carry out.This suddenly change of temperature result in short grained Fast Sintering and enough therefore led to
The reduction that grain intensity is used for subsequently in rotary kiln.In recirculating fluidized bed, due to high flow rate, heat exchange especially good so that
Further speed up sintering process.
This technique is inconsistent with normal process steps, according to common process, the material that will process introduce fluid bed be
Do not expose a material to what the region of high thermograde was carried out, because especially for bigger microgranule, the high temperature difference can be led
Cause the stress in material and subsequent rupture and deformation.Further, since introducing at hottest point, it is necessary for supply line
Material proposes higher requirement.Therefore feed and also become costly.
The hottest point of fluid bed is located at burning and point or steam inlet point occurs.
It moreover has been found that it is favourable for having at least iron content of 30wt-% containing iron granules, preferably at least 50 to
80wt-%, to make processing charges keep economical.
Favourable aspect restriction (provide that) Fe concentrate of the present invention has most 5wt-% and is coarser than 100 μm and about 55
It is less than 32 μm of granularity to 60wt-%, because if average diameter is bigger, directly processing may economically advantageously.
Ultra-fine concentrate can exist as filter cake or as dry powder in bulk material (bulk material).The ratio of microgranule
Surface area is 1600 and 4000cm2Between/g, depending on the mineral composition of mineralogy or the iron ore concentrate being used.Preprocessing (example
As with pulverize in the form of) possibly for granularity evenly for be favourable.
As binding agent, inorganic bond (for example as bentonite) is optimal, because thus can use temperature during hardening
Undesirable side reaction is excluded in flying up of degree.According to the present invention, the addition of this binding agent should be 0.25 and 1.5wt-%
Between, it depends on mineral composition and the specific surface area of iron ore concentrate in principle.
Form the granularity that the mixture of granule advantageously should have between 0.1 and 6mm in microparticle shaper, because this
Kind of granularity ensure that actually whole microgranule is uniform heating during being incorporated into the reactor the hottest stage, individual particles it
Between there is no obvious thermograde.
It moreover has been found that the water content of 8 to 14wt-% is particularly advantageous, it depends on corresponding mineral group in principle
Become.
Optimal hardening temperature, between 850 and 1050 DEG C, again depends on mineral composition in the range of this.Experiment table
Bright, in the process according to the present invention, during thermmohardening, the most about granule of 5wt-% obtains as abrasion, wherein herein
Particle size fractions<100 μm are defined as wearing and tearing.
As the fuel of hardening process, natural gas or light-weight fuel oil can be straight in fluidized-bed reactor or hot air generator
Connect burning.If using hot air generator, just steam is supplied to fluidized-bed reactor.
Alternatively, fuel can be used coal as, wherein will in single reactor in the temperature between 650 and 950 DEG C
Coal carbonization, carbonization gas are incorporated in sclerous reaction device as fuel, and hot carbonization coke is incorporated into as reducing agent
In the downstream process stage, it is preferably introduced in the reduction carrying out in rotary kiln.
It has also been found that make to be hardened in carry out in oxidizing atmosphere being favourable, the oxygen content in preferred cycle fluid bed is in 2 Hes
Between 10wt-%.As a result, the ferrum of oxidation stage 2 has been oxidized to the ferrum of oxidation stage 3 and has released more heat energy.Thus can
To reduce the heat input in reactor.
During the hardening in oxygen-containing atmosphere, there is following reaction：
2Fe3O4+1/2O2→3Fe2O3(magnetic iron ore is oxidized to bloodstone)
Fe2O3x H2O→Fe2O3+H2O (removal of the water of crystallization of such as goethitum)
If not oxygenous in atmosphere, just only there is the removal that second reaction is water of crystallization.
Subsequently the microparticle of hardening is experienced reduction treatment with coal in rotary kiln, wherein by the oxygen solution of iron oxides simultaneously
And ferrum enters into metal phase.Ratio (C between carbon and ferrumfix:Fe) it is 0.3-0.7:1.During reduction, there is following reaction：
Fe2O3+CO→2FeO+CO2
CO2+C→2CO
FeO+CO→Femet+CO2
Realize aspect in technology it appears that particularly advantageously the hot granule of hardening is not added with cooling ground from fluidized-bed reactor
It is incorporated in rotary kiln.By this way, on the one hand can energy saving, on the other hand can reduce stove volume, thus can reduce
Its cost of investment.When loading granule under thermal conditions, heat originally required for required granule in rotary kiln
Furnace length is just optional.Rotary kiln can be designed to production capacity that is shorter or can increasing existing rotary kiln.?
In existing revolution guard system, can be introduced by heat increases production capacity.Can be preheated using the hot waste gas of fluidized-bed reactor
Necessary process gas (process air) or generation steam.
Although improving hardening, in order to provide produced dust in fluid bed and reduction to be used for economic use, send out
Show and via dust separation system, these dust have been separated from fluid bed and/or reduction phase and be recycled into mixing list
It is favourable in unit or granule formation unit.
Particularly under more on a small scale, for example as in laboratory and pilot experiment, be security reason and by stove output
The temperature being cool below 30 DEG C is favourable, and wherein this cooling preferably should be entered under inert atmosphere (such as nitrogen atmosphere)
OK.Cooled material (it is the mixture of sponge iron, charcoal (char) and ash) is encased in magnetic separator so that will
Sponge iron and carbon and ash separation.
Additionally, the present invention includes the equipment with following feature, described equipment is adapted for carrying out process according to the invention.This
The equipment of sample is included for mixing containing iron granules with least one binding agent and water to obtain the device of mixture.After this device
It is for the device that granule is formed into granule is carried out to mixture.It is with recycle stream for hardened granules after this device
Change the reactor of bed.Fluidized-bed reactor is designed so that the supply line of granule leads to the relatively low area of fluidized-bed reactor
Domain is simultaneously thus led at the hottest point of fluid bed.For this purpose, the particularly material of this supply line and the charging providing at this
Mode must be designed so that it forever stands these temperature.
In the research and development of the present invention, feed fluid bed with steam, granule supply line is opened in this feed pipe region, because
It is also not lose any heat energy to fluid bed in this steam.
To the device for mixing and/or it is used for micro- when providing by the reduction apparatus in fluidized-bed reactor and/or downstream
During at least one reflux line of device that particle shape becomes, it is also advantageous.
The advantage of process according to the invention one side is, up to the present only can use by magnetic iron ore and bloodstone essence
Ore deposit forms and in addition has the pelletizing of suitable major diameter (between 9 and 16mm).Process according to the invention also can be surpassed using other
Fine granularity concentrate and other granularities, without obtaining intractable dust loop.
Additionally, the microparticle being hardened according to the present invention has the porosity bigger than lump ore, thus can than lump ore and
Classical burning pelletizing (hardening more than 1300 DEG C) faster and is preferably reduced.
Additionally, by the sclerous reaction device according to the present invention and SL/RN stove are combined, can future self-hardening stove
Delivery in hot weather go out to be directly loaded under thermal conditions in rotary kiln.Thus saving heat energy and increased the specific production of rotary kiln
Ability.
Finally, process according to the invention also makes produced all dust, wet or dry, can be recycled to micro-
In granule formation process, ensure that completely enclosed material circulation.
Subsequently explain in detail the present invention with exemplary with reference to the accompanying drawings.Description and/or all features illustrating
Or itself is with any combinations formation subject of the present invention, and does not rely on the inclusion (inclusion) of they in claim
Or they return draw (back-reference).
Unique accompanying drawing shows the flow chart for implementing the equipment according to present invention process.
Fine-grained iron ore is incorporated in mixing arrangement 1.In addition at least one supply line 2 leads to this mixing arrangement
In 1, introduce, via this pipeline, the mixture being at least made up of binding agent and water.Certainly provide separately for every kind of single additive
Supply line be also possible.
Via pipeline 3, such mixture producing is incorporated into particle-forming apparatus 4 from mixing arrangement 1.There by
Mixture forms mean diameter 0.1 to the granule (microparticle is formed) of 6mm, is introduced into fluidized-bed reactor via pipeline 5
In 10.Fluidizing gas is injected in the fluidized-bed reactor 10 being preferably designed for recirculating fluidized bed via pipeline 11, so that
Recirculating fluidized bed 14 is formed on siege (grate) 13.Slightly surpassing above siege 13, steam enters via pipeline 12, by this
Steam heated fluidized bed 14.Also fuel can be incorporated into fluidized-bed reactor via pipeline 12 or extra unaccounted pipeline
In 10, rather than supply steam in internally fired reactor.Granule supply line 5 terminates at the straight of supply line 12
Connect adjacent.
Via pipeline 15, the hardened granules containing iron oxides are fed to reduction phase, particularly in rotary kiln 16,
Wherein for example by SL/RN technique, they are reduced.Via pipeline 17, thus such as coal is incorporated into work in rotary kiln 16
For reducing agent.
Via pipeline 20, will be incorporated in cyclone separator 21 by the dust that fluidized-bed reactor 10 produces, wherein will
Described dust and air-flow separate.Via pipeline 22, solid constituent is recycled in mixing arrangement 1 and/or particle-forming apparatus 4
In so that reworking becomes granule.
Via pipeline 30, exhaust after-treatment 31 will be supplied to by the gas that fluidized-bed reactor 10 extracts.Then can will be pure
Activating QI body is discharged into air via pipeline 32 and/or is used as process gas.
Embodiment
Granule is formed：
By pulverize and be processed into pelletizing fineness (pelletizing fineness) (<100 μm) containing 69wt-% ferrum
Magnetite concentrate, is mixed with 0.5wt-% bentonite and the desired amount of water, and subsequently carries out granule and formed, and the amount of required water is by institute
Desired granule water capacity determines.The water capacity of thus obtained granule should be about 10wt-%；The granularity of granule be 0.1 to
3mm.
Hardening：
Subsequently thus obtained granule is hardened with continuously running mode in about 980 DEG C in a fluidized bed reactor, then
It is cooled to about 30 DEG C.The production capacity of the equipment being used is about 14kg/h.During the hardening carrying out in oxygen-containing atmosphere, by magnetic
Iron mine is oxidized to bloodstone, in addition to discharge heat energy.
Reduction in short rotary furnace for the microparticle of hardening：
The coal of the hardening microparticle of 60kg and 40kg is mixed and is encased in stove.Cfix:FetotRatio is 0.60.?
1020 to 1050 DEG C process loading thing about 4 hours.After cooling down in a nitrogen atmosphere, average sample is simultaneously encased in feeble field magnetic separation
To separate remaining coal and ash in device.Magnetic product sponge iron has analysis below result：
Fetotal:80.0wt-%
Fe2+:2.6wt-%
Femet:76.8wt-%
Degree of metalization：96wt-%
Diameter in magnetic product<The amount of the microgranule of 0.1mm is about 4.5wt-%.
Reference numerals list：
1 mixing arrangement
2,3 pipelines
4 particle-forming apparatus
5 pipelines
10 fluidized-bed reactors
11,12 pipelines
13 sieges
14 fluid beds
15 pipelines
16 reduction phases (rotary kiln)
17 pipelines
20 pipelines
21 cyclone separator
22 pipelines
30 pipelines
31 exhaust-gas treatments
32 pipelines
Claims (10)
1. be used for by the technique producing hardened granules containing iron granules, wherein will described containing iron granules and at least one binding agent and water
Mixing, to obtain mixture, described mixture is formed granule, and described granule is incorporated in fluidized-bed reactor be used for hard
Change, the granule of wherein still moistening has the water content of 8 to 14wt-%, and be incorporated into described at the hottest point of fluid bed
In fluidized-bed reactor, wherein hardened granules are supplied directly to the downstream reduction stage and wherein said reduction phase is revolution
Kiln,
It is hardened in described in described fluidized-bed reactor in oxidizing atmosphere and carry out.
2. technique according to claim 1 is it is characterised in that be incorporated into described fluidized-bed reaction by the granule of described moistening
Steam is also introduced into the relatively low area in the lower region of this fluidized-bed reactor or in fluidized-bed reactor by the lower region of device
Carry out the burning of fuel in domain.
3. technique according to claim 1 and 2 is it is characterised in that described have at least ferrum of 30wt-% containing iron granules and contain
Amount and/or at most 5wt-% are coarser than the granularity of 0.1mm.
4. technique according to claim 1 is it is characterised in that described adhesive is inorganic bond reagent.
5. technique according to claim 1 is it is characterised in that described granule has the granularity between 0.1 and 6mm.
6. technique according to claim 1 is it is characterised in that temperature in described fluidized-bed reactor is 850 and 1050
Between DEG C.
7. technique according to claim 1 is it is characterised in that be used for mixing and/or granulated by iron dust containing recirculation
Become, described iron dust containing is in described fluidized-bed reactor and/or in the reduction phase in downstream of described fluidized-bed reactor
Produce.
8. it is used for implementing the equipment of technique described in claim 1, described equipment belt is had and glued with least one for containing iron granules
Mixture and water mix to obtain the device (1) of mixture, for described mixture is carried out granule formed with obtain have 8 to
The device (4) of the granule of the moistening of the water content of 14wt-%, and it is used for the fluidized-bed reactor (10) of described granule that hardens,
The supply line (5) of wherein granule leads in the lower region of described fluidized-bed reactor (10), is wherein derived from hardening stove
Delivery in hot weather goes out to be directly loaded under thermal conditions in reduction phase (16) and wherein said reduction phase (16) is rotary kiln,
It is hardened in described in described fluidized-bed reactor in oxidizing atmosphere and carry out.
9. equipment according to claim 8, described equipment carries the supply line (11) of steam or fuel, and its feature exists
In the supply line (5) of described granule is opened in described steam or the supply line (11) of fuel enters into described fluidized-bed reaction
In the region of device (10).
10. equipment according to claim 8 or claim 9 is it is characterised in that from described fluidized-bed reactor (10) and/or downstream
Reduction phase (16) draw at least one reflux line (20,22) and arrive and be used for containing iron granules and at least one binding agent and water
Mixing with obtain in the device (1) of mixture and/or to be used for described mixture is carried out granule formation with obtain have 8 to
In the device (4) of the granule of the moistening of the water content of 14wt-%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012005454.8A DE102012005454B4 (en) | 2012-03-20 | 2012-03-20 | Method and device for producing hardened granules from iron-containing particles |
| DE102012005454.8 | 2012-03-20 | ||
| PCT/EP2013/054558 WO2013139606A1 (en) | 2012-03-20 | 2013-03-07 | Process and apparatus for producing hardened granules from iron-containing particles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104204244A CN104204244A (en) | 2014-12-10 |
| CN104204244B true CN104204244B (en) | 2017-03-01 |
Family
ID=47884305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380015110.9A Active CN104204244B (en) | 2012-03-20 | 2013-03-07 | By the technique and the equipment that produce hardened granules containing iron granules |
Country Status (7)
| Country | Link |
|---|---|
| CN (1) | CN104204244B (en) |
| AU (1) | AU2013234571B2 (en) |
| DE (1) | DE102012005454B4 (en) |
| EA (1) | EA025984B1 (en) |
| IN (1) | IN2014MN01929A (en) |
| WO (1) | WO2013139606A1 (en) |
| ZA (1) | ZA201406402B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3984229A (en) * | 1970-04-20 | 1976-10-05 | Boliden Aktiebolag | Method for producing coarse powder, hardened iron oxide material from finely divided raw material substantially consisting of hematite and/or magnetite |
| CN102149831A (en) * | 2008-09-11 | 2011-08-10 | 西门子Vai金属科技有限责任公司 | Process for producing agglomerates of finely particulate iron carriers |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1262311B (en) | 1962-06-30 | 1968-03-07 | Metallgesellschaft Ag | Method and device for reducing iron oxides (concentrates) to sponge iron |
| DE2517543C2 (en) | 1975-04-21 | 1985-12-12 | Board Of Control Of Michigan Technological University, Houghton, Mich. | Process for producing hardened agglomerates from metallurgical dust |
| SE439327B (en) * | 1980-12-08 | 1985-06-10 | Bostroem Olle | PROCEDURE FOR THE PREPARATION OF A SUBSTANCE IN SUCCESSION CHARGES |
| JPS63103851A (en) | 1986-10-21 | 1988-05-09 | 電気化学工業株式会社 | Binder for fine powder iron ore solidification |
| DE4437549C2 (en) | 1994-10-20 | 1996-08-08 | Metallgesellschaft Ag | Process for producing metallic iron from fine-grained iron ore |
| GB9604927D0 (en) | 1996-03-08 | 1996-05-08 | Allied Colloids Ltd | Activation of swelling clays and processes of using the activated clays |
| DE19718136C2 (en) | 1997-04-30 | 2003-02-13 | Outokumpu Oy | Process for the thermal treatment of granular iron ore before reduction |
| CA2251339A1 (en) | 1997-10-30 | 1999-04-30 | Hidetoshi Tanaka | Method of producing iron oxide pellets |
| US6802886B2 (en) | 2000-06-05 | 2004-10-12 | Midrex Technologies, Inc. | Method of producing a metallized briquette |
| DE102007030394A1 (en) | 2007-06-29 | 2009-01-08 | Outotec Oyj | Thermal treatment of sulfide ores such as molybdenite to produce molybdenum trioxide, by roasting enriched ore concentrate in first reactor, separating the solids in separator, and converting the solid to metallic oxide in second reactor |
-
2012
- 2012-03-20 DE DE102012005454.8A patent/DE102012005454B4/en active Active
-
2013
- 2013-03-07 AU AU2013234571A patent/AU2013234571B2/en active Active
- 2013-03-07 CN CN201380015110.9A patent/CN104204244B/en active Active
- 2013-03-07 WO PCT/EP2013/054558 patent/WO2013139606A1/en active Application Filing
- 2013-03-07 IN IN1929MUN2014 patent/IN2014MN01929A/en unknown
- 2013-03-07 EA EA201491633A patent/EA025984B1/en not_active IP Right Cessation
-
2014
- 2014-09-01 ZA ZA2014/06402A patent/ZA201406402B/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3984229A (en) * | 1970-04-20 | 1976-10-05 | Boliden Aktiebolag | Method for producing coarse powder, hardened iron oxide material from finely divided raw material substantially consisting of hematite and/or magnetite |
| CN102149831A (en) * | 2008-09-11 | 2011-08-10 | 西门子Vai金属科技有限责任公司 | Process for producing agglomerates of finely particulate iron carriers |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013139606A1 (en) | 2013-09-26 |
| DE102012005454A1 (en) | 2013-09-26 |
| DE102012005454B4 (en) | 2020-06-18 |
| EA025984B1 (en) | 2017-02-28 |
| EA201491633A1 (en) | 2015-03-31 |
| ZA201406402B (en) | 2015-12-23 |
| CN104204244A (en) | 2014-12-10 |
| IN2014MN01929A (en) | 2015-07-10 |
| AU2013234571A1 (en) | 2014-09-18 |
| AU2013234571B2 (en) | 2015-09-10 |
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