CN105838870A - System for preparing reduced iron and application thereof - Google Patents
System for preparing reduced iron and application thereof Download PDFInfo
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- CN105838870A CN105838870A CN201610350429.2A CN201610350429A CN105838870A CN 105838870 A CN105838870 A CN 105838870A CN 201610350429 A CN201610350429 A CN 201610350429A CN 105838870 A CN105838870 A CN 105838870A
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- 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
- C22B1/02—Roasting processes
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- 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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
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- 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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/04—Working-up slag
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses a system for preparing reduced iron and a method for preparing the reduced iron through the system for preparing the reduced iron. The system for preparing the reduced iron comprises a slag melting device, a pelletizing device, a reduction roasting device, a dry magnetic separation device and a slag-iron separating device. According to the system, molten nickel slag serves as raw material, the slag melting device is provided with an additive inlet and a fluxing agent inlet, additives and fluxing agents are added into the high-temperature molten nickel slag before the heating treatment, the technological process is simplified, and the production cost and the operation cost are lowered.
Description
Technical field
The present invention relates to prepare the system of reduced iron, and utilize the method that the aforesaid system preparing reduced iron prepares reduced iron.
Background technology
Nickel slag is the solid slag produced during pyrogenic process nickel metallurgy, belongs to the one in non-ferrous metal slag.In nickel sulfide ore pyrogenic process nickel metallurgy
In production, only China increases nickel slag every year and also reaches about 1,600,000 t.Ended for the end of the year 2012, only as a example by Jinchuan Non-ferrous Metals Company,
Adding up to store up nickel fibers slag and reach 33,000,000 t, the most about iron content 14,170,000 t, these waste residues do not only take up a large amount of soil, also make
The environmental problems such as one-tenth dust airborne dust, heavy metal are oozed out, underground water pollution, soil dilution, bring to human survival and social development
Serious harm.So far due to the inadequate and restriction of related process technologies to nickel slag resource attention degree, in China, nickel slag
The most unrealized extensive ripe popularization of high-efficiency comprehensive utilization, a large amount of nickel slag mucks are abandoned in slag field, cause the stream of valuable metal element in slag
Lose, the waste of resource.
Owing to ferrum (TFe) content complete in nickel slag is typically about 35%～45%, far above the payable grade of China's iron ore
(TFe > 27%), therefore the utilization ways of nickel slag is many to reclaim residue ferrum element at present.Yet with in nickel slag, ferrum is first
Element is main with fayalite, Fe3O4Existing etc. mineral facies, these mineral are the most closely entrenched in one with other non magnetic ores in addition
Rise, and there is weak magnetic (such as fayalite), cause process routes such as directly utilizing tradition mill choosing, magnetic separation, be difficult to nickel
In slag, whole ferrum elements are reclaimed.To this end, in existing correlational study and through engineering approaches are applied, nickel slag many by with addition of reducing agent,
Additive and binding agent, restore roasting after pelletizing or agglomeration, obtains metallized pellet or agglomerate.Finally, then by these gold
Genus pellet or agglomerate, after the operations such as broken, grinding and magnetic separation, obtain fine iron breeze, then return among smelting iron and steel.
Additionally, smelting nickel slag tapping temperature is at 1170～1250 DEG C, residual heat resources are many." energy-saving and emission-reduction " 12 planning " ",
In relevant policies files such as " industrial energy saving " 12 planning " ", all mention the recycling to industrial and mining establishment's waste heat energy,
And in country the Eleventh Five-Year Plan period, surplus energy utility is also subsidized by state revenue.But, viscosity low by slag thermal conductivity
Greatly, the factor impact such as thermal transition efficiency is low, mostly the research of existing slag is to carry out slag recycling high-temperature residual heat after dry granulation,
Through engineering approaches application there is also great difficulty.Therefore, to this part of waste heat energy come out of the stove in nickel slag, at above-mentioned nickel slag roasting reduction
-grinding magnetic separation tradition research technique there is not embodiment yet, and in nickel slag reducing roasting process, also wants post bake, cause
The huge waste of the energy.
Thus, the method utilizing nickel slag to prepare high-quality iron product requires study.
Summary of the invention
It is contemplated that at least solve one of technical problem present in prior art.To this end, it is an object of the present invention to carry
Going out a kind of system preparing reduced iron, this system prepares reduced iron with melted nickel slag for raw material, and heat utilization efficiency is high, produces and runs
Low cost.
According to an aspect of the present invention, the invention provides a kind of system preparing reduced iron.According to embodiments of the invention,
This system includes: slagging device, and described slagging device has melted nickel slag entrance, additive entrance, flux entrance, stirring
Device and the outlet of mixed melting nickel slag；Pelletizer, described pelletizer has granulation material inlet, stream cinder hole and slag particle outlet, described
Granulation material inlet is connected with the outlet of described mixed melting nickel slag；Reduction roasting device, described reduction roasting device has slag particle and enters
Mouth, reducing agent entrance and reducing material outlet, described slag particle entrance is connected with the outlet of described slag particle；Dry type magnetic separation device, described
Dry type magnetic separation device has reducing material entrance, metallized pellet outlet and carbonaceous material outlet, described reducing material entrance and institute
State reducing material outlet to be connected；Slag sluicing system device, described slag sluicing system device has metallized pellet entrance, reduced iron outlet
And slag-drip opening, described metallized pellet entrance is connected with the outlet of described metallized pellet.
The system preparing reduced iron according to embodiments of the present invention, with melted nickel slag as raw material, solves conventional high-temperature nickel slag and needs shrend
Just can proceed the difficult problem processed after cooling or slow cooling, prepare high-grade iron product, not only realize nickel metal in the dreg unit
Element high-efficiency comprehensive utilization, and achieve effective utilization of the waste heat of melted nickel slag, the heat utilization efficiency of system is high.Further, changing
Additive entrance and flux entrance are set on slag device, before heat treated, in high-temperature fusion nickel slag, i.e. add additive and help
Flux, can make slag homogenize by the stirring of agitator, directly adjusts internal structure and the chemical composition of nickel slag, improves nickel slag
Metallurgical performance, then through high temperature granulated processed, high heat granulation nickel slag raw material can be provided for reduction roasting device direct-reduction,
Eliminate the techniques such as pelletizing, drying and pelletizing preheating, shorten the recovery time of reduction roasting device, decrease reduction roasting dress
The energy consumption put, reduces production and operating cost.
It addition, the system preparing reduced iron according to the above embodiment of the present invention can also have a following additional technical characteristic:
According to embodiments of the invention, this system farther includes: storage facility, described storage facility have introducing stream slag grain,
Scum hole and draw stream slag grain, described introduce stream slag poor and described mixed melting nickel slag outlet and is connected, described draws that stream slag is poor and institute
State granulation material inlet to be connected.
According to embodiments of the invention, described slag sluicing system device is that mill selects segregation apparatus or molten point of segregation apparatus.
According to a further aspect in the invention, the invention provides and a kind of utilize the aforesaid system preparing reduced iron to prepare reduced iron
Method.According to embodiments of the invention, the method includes: the melted nickel slag gone out by nickel fibers fire grate is fed directly to describedization slag
Device, with additive and flux mix and blend carry out heat treated, in order to obtain mixed melting nickel slag；Described mixing is melted
Melt nickel slag to be delivered to pelletizer and carry out granulated processed, in order to obtain slag particle；Described slag particle is delivered to reduction roasting device, and also
Former dose of contact, carries out reduction roasting process, in order to obtain reducing material；Described reducing material is carried out dry type through dry-type magnetic extractor
Magnetic separation separates, in order to obtain metallized pellet and carbonaceous material；And described metallized pellet is carried out slag sluicing system, in order to
To reduced iron and slag.
The method preparing reduced iron according to embodiments of the present invention, with melted nickel slag as raw material, solves conventional high-temperature nickel slag and needs shrend
Just can proceed the difficult problem processed after cooling or slow cooling, prepare high-grade iron product, it is achieved the efficient comprehensive utilization of nickel slag
With, it is achieved that the UTILIZATION OF VESIDUAL HEAT IN of melted nickel slag, the heat utilization efficiency of method is high.Further, before heat treated will additive with molten
Melt the mixing of nickel slag, slag can be made to homogenize by the stirring of agitator, directly adjust internal structure and the chemical composition of nickel slag, carry
The metallurgical performance of nickelic slag, then through high temperature granulated processed, can process for reduction roasting and high heat granulation nickel slag raw material is provided, save
Go the techniques such as pelletizing, drying and pelletizing preheating, shortened the recovery time of reduction roasting device, decrease reduction roasting device
Energy consumption, reduce production and operating cost.Thus, the method is utilized to prepare reduced iron, the ferrum product of the reduced iron prepared
Position is high, and utilization rate of waste heat is high, less energy consumption, and technological process is simple, and production cost is low.
According to embodiments of the invention, the gross mass of described additive and described flux with the mass ratio of described melted nickel slag is
(5～25): 100.
According to embodiments of the invention, the temperature of described melted nickel slag is 1170～1250 DEG C.
According to embodiments of the invention, the temperature of described mixed melting nickel slag is 1250～1350 DEG C.
According to embodiments of the invention, described additive is (5～20) with the mass ratio of described flux: (0～5).
According to embodiments of the invention, the mean diameter of described slag particle is 5～20mm, and temperature is 800～1000 DEG C.
According to embodiments of the invention, described slag sluicing system is that mill ore magnetic selection separates or molten point of separation.
The additional aspect of the present invention and advantage will part be given in the following description, and part will become apparent from the description below,
Or recognized by the practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage the accompanying drawings below description to embodiment will be apparent from from combining and
Easy to understand, wherein:
Fig. 1 shows the structural representation of the system preparing reduced iron according to an embodiment of the invention；
Fig. 2 shows the structural representation of the system preparing reduced iron according to another embodiment of the present invention；
Fig. 3 shows that the stream that the system of reduced iron prepares the method for reduced iron is prepared in the utilization according to another embodiment of the present invention
Journey schematic diagram.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most identical or
Similar label represents same or similar element or has the element of same or like function.Describe below with reference to accompanying drawing
Embodiment is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In describing the invention, term " longitudinally ", " laterally ", " on ", D score, "front", "rear", "left", "right",
Orientation or the position relationship of the instruction such as " vertically ", " level ", " top ", " end " are based on orientation shown in the drawings or position relationship,
Be for only for ease of description the present invention rather than require the present invention must with specific azimuth configuration and operation, therefore it is not intended that
Limitation of the present invention.
Prepare the system of reduced iron
According to an aspect of the present invention, the invention provides a kind of system preparing reduced iron.With reference to Fig. 1, according to the present invention
Embodiment, this system is explained, this system includes: slagging device 100, pelletizer 200, reduction roasting dress
Put 300, dry type magnetic separation device 400 and slag sluicing system device 500.
According to embodiments of the invention, slagging device 100 has melted nickel slag entrance, additive entrance, flux entrance, stirs
Mixing device and the outlet of mixed melting nickel slag, in slagging device 100, melted nickel slag utilizes agitator to mix with additive and flux
Stirring, and carry out heat treated, obtain mixed melting nickel slag.Thus, by arranging additive entrance in slagging device and helping
Flux entrance, is i.e. added additive and flux before heat treated in high-temperature fusion nickel slag, can be made by the stirring of agitator
Slag homogenizes, and directly adjusts internal structure and the chemical composition of nickel slag, improves the metallurgical performance of nickel slag, then at high temperature granulation
Reason, can provide high heat granulation nickel slag raw material for reduction roasting device direct-reduction, eliminate pelletizing, drying and pelletizing preheating
Etc. technique, shorten the recovery time of reduction roasting device, decrease the energy consumption of reduction roasting device, reduce production and run
Cost.
Wherein it is desired to explanation, melted nickel slag can be that nickel fibers process directly obtains, it is also possible to is that other smelts reaction
The nickeliferous hot material obtained.
According to embodiments of the invention, pelletizer 200 has granulation material inlet, stream cinder hole and slag particle outlet, wherein, granulation
Material inlet is connected with the outlet of mixed melting nickel slag, and mixed melting nickel slag is carried out granulated processed.Owing to the particle diameter of raw material is little, have
It is beneficial to reduce the temperature of reduction roasting, by pelletizer, mixed melting nickel slag is carried out granulated processed, make mixed melting nickel slag particle
Slag particle for small particle, it is simple to reduce the energy consumption of follow-up reduction roasting.
According to a particular embodiment of the invention, this pelletizer 200 can be revolving cup pelletizer, on this revolving cup pelletizer circumference wall
It is provided with stream cinder hole, high-temperature slag can be made to throw away in high-speed rotation, and formation particle diameter is 5～15mm after air cooling solidifies
Hot slag particle.Thus, being granulated effective, efficiency is high, and the hot slag particle obtained can directly carry out reduction roasting, promotes to pass
Heat and the carrying out of reduction reaction, shorten the time of reduction reaction, reduces the energy consumption that reduction roasting processes further.The temperature of slag particle
Being 800～1000 DEG C, hot slag particle can directly carry out reduction roasting, promotes the carrying out of heat transfer and reduction reaction, shortens reduction
The time of reaction, reduce the energy consumption that reduction roasting processes further.
According to some embodiments of the present invention, reduction roasting device 300 has slag particle entrance, reducing agent entrance and reducing material and goes out
Mouthful, wherein, slag particle entrance is connected with slag particle outlet, and reduction roasting device 300, for slag particle is carried out reduction roasting process, makes
The oxide of ferrum is reduced to reduced iron.
According to a particular embodiment of the invention, reduction roasting device is rotary hearth furnace, this reduction roasting device have medium temperature roast district and
High-temperature roasting district.And then, slag particle through collect after can directly heat be distributed into bottom be covered with on the rotary hearth furnace material bed of reducing agent, fabric thickness
Be 10～40mm, hot slag particle in rotary hearth furnace through in after warm area, high-temperature region be heated to 1150～1350 DEG C, keep
20～40min, complete direct reduction reactor generation metallized pellet, metallized pellet and residue carbonaceous material and discharge the most in the lump and turn the end
Outside stove.
According to a particular embodiment of the invention, dry type magnetic separation device 400 has reducing material entrance, metallized pellet outlet and contains
Carbonizable substance exports, and wherein, reducing material entrance is connected with reducing material outlet, and dry type magnetic separation device 400 is for by reducing material
In metallized pellet and carbonaceous material separate, obtain metallized pellet and carbonaceous material.Thus, by metallized pellet from
Reducing material is separated.
According to a particular embodiment of the invention, slag sluicing system device 500 has metallized pellet entrance, reduced iron outlet and deslagging
Mouthful, wherein, metallized pellet entrance is connected with metallized pellet outlet, and slag sluicing system device 500 is for entering metallized pellet
Row slag sluicing system, obtains reduced iron and slag.Thus, reduced iron is separated from metallized pellet.
According to embodiments of the invention, slag sluicing system device 500 selects segregation apparatus or molten point of segregation apparatus, wherein, mill choosing for mill
Segregation apparatus has mill and selects solid product entrance, fine grinding powder outlet, magnetic separation material inlet and magnetic separation product outlet, and mill selects solid
Product inlet is connected with metallized pellet outlet, metallized pellet is carried out fine grinding process, obtains fine grinding material, and fine grinding material goes out
Mouth is connected with magnetic separation material inlet, and fine grinding material is carried out magnetic separation process, so that material is finely ground, magnetic separation obtains after separating
Reduced iron product；A molten point segregation apparatus has metallized pellet entrance, molten point of ferrum outlet and melting slag outlet, wherein, metallization
Pelletizing entrance is connected with metallized pellet outlet, thus realizes molten point of ferrum, the separation of melting slag by intermittent take-off mode, obtains
Reduced iron product.
The system preparing reduced iron according to embodiments of the present invention, with melted nickel slag as raw material, solves conventional high-temperature nickel slag and needs shrend
Just can proceed the difficult problem processed after cooling or slow cooling, prepare high-grade iron product, it is achieved the efficient comprehensive utilization of nickel slag
With, it is achieved that the UTILIZATION OF VESIDUAL HEAT IN of melted nickel slag, the heat utilization efficiency of system is high.Further, slagging device arranges additive entrance
With flux entrance, during changing Slag treatment, i.e. add additive and flux, directly adjust internal structure and the chemistry of nickel slag
Composition, improves the metallurgical performance of nickel slag, then through high temperature granulated processed, can provide high heat for reduction roasting device direct-reduction
Granulation nickel slag raw material, eliminates the techniques such as pelletizing, drying and pelletizing preheating, shortens the recovery time of reduction roasting device, subtracts
Lack the energy consumption of reduction roasting device, reduce production and operating cost.
With reference to Fig. 2, according to embodiments of the invention, this system farther includes: storage facility 600, and storage facility 600 has
There are introducing stream slag grain, scum hole and extraction stream slag grain, wherein, introduce stream slag grain and be connected with the outlet of mixed melting nickel slag, draw stream
Slag grain is connected with granulation material inlet, introduces slag trough for the high-temperature molten slag nickel slag in slagging device 100 introduces storage dress
Put 200, draw slag trough for the high-temperature slag in storage facility 200 is led to granulating device 200.Thus, storage is utilized
Cryopreservation device carries out intermediate storage to mixed melting nickel slag, it is ensured that mixed melting nickel slag enters follow-up granulation with continual and steady flow velocity
Device.
According to a particular embodiment of the invention, introduce stream slag grain and extraction slag trough has heat insulation function.Thus, it is to avoid nickel slag
Thermal loss, heat utilization efficiency is high.
The method preparing reduced iron
According to a further aspect in the invention, the invention provides and a kind of utilize the aforesaid system preparing reduced iron to prepare reduced iron
Method.With reference to Fig. 3, according to embodiments of the invention, explaining this method preparing reduced iron, the method includes:
S100 heat treated
According to embodiments of the invention, the melted nickel slag gone out by nickel fibers fire grate is fed directly to slagging device, with additive and helping
Flux mix and blend also carries out heat treated, obtains mixed melting nickel slag.Inventor adds by adding in high-temperature fusion nickel slag
Agent and flux, directly adjust internal structure and the chemical composition of nickel slag, improve the metallurgical performance of nickel slag, then at high temperature granulation
Reason, can provide high heat granulation nickel slag raw material for reduction roasting device direct-reduction, eliminate pelletizing, drying and pelletizing preheating
Etc. technique, shorten the recovery time of reduction roasting device, decrease the energy consumption of reduction roasting device, reduce production and run
Cost.
According to embodiments of the invention, the gross mass of additive and described flux with the mass ratio of described melted nickel slag is
(5～25): 100.Thus, after additive and flux are mixed in this ratio with melted nickel slag, melted nickel slag can be made by stirring
Internal structure and chemical composition change, obtain the mixed melting nickel slag homogenized, improve further the metallurgical performance of nickel slag,
Reduce reduction reaction temperature, beneficially the carrying out of sequential reduction reaction.
According to embodiments of the invention, additive is (5～20) with the mass ratio of flux: (0～5).Thus, additive with
After flux is mixed in this ratio, the internal structure of melted nickel slag and chemical composition can be made to change by stirring, obtain homogenizing
The mixed melting nickel slag changed, improves the metallurgical performance of nickel slag further, reduces reduction reaction temperature, beneficially sequential reduction reaction
Carrying out.
According to some embodiments of the present invention, additive is at least one in limestone or quick lime, and flux is for being selected from
At least one in calcined soda for industry or fluorite.Thus, can not add in nickel slag Direct Reduction, eliminate pelletizing, baking
The techniques such as dry and pelletizing preheating, shorten the recovery time of reduction roasting device, reduce the energy consumption of reduction roasting device, reduce and produce
And operating cost.
According to embodiments of the invention, the temperature of melted nickel slag is not particularly limited, as long as the high temperature that metallurgy etc. obtain
Melted nickel slag, thus, effectively utilize the waste heat of melted nickel slag.According to some embodiments of the present invention, the temperature of melted nickel slag
Degree is 1170～1250 DEG C.Thus, utilization rate of waste heat is high, and the energy consumption of the process such as subsequent heat smelting is low.
According to embodiments of the invention, the temperature of described mixed melting nickel slag is 1250～1350 DEG C.Thus, it can be ensured that mixing
Melted nickel slag fully homogenizes, and provides good material condition for follow-up direct-reduction.
S200 granulated processed
According to embodiments of the invention, mixed melting nickel slag is delivered to pelletizer and carries out granulated processed, obtain slag particle.Inventor
Finding suitable raw material particle size, advantageously reduce the temperature of reduction roasting, the breathability of reduction reaction is also preferable simultaneously, therefore leads to
Cross granulated processed, can be that direct-reduction provides the suitable slag particle of particle diameter, it is simple to reduce the energy consumption of follow-up reduction roasting, improve also
Former effect.
According to embodiments of the invention, the mean diameter of slag particle is 5～20mm, and temperature is 800～1000 DEG C.The particle diameter of raw material
The least, more advantageously reduce the temperature and time of reduction roasting, by granulated processed, make mixed melting nickel slag particle turn to small particle
Slag particle, it is simple to reduce the energy consumption of follow-up reduction roasting.But particle diameter is too small, the breathability of direct reduction reactor is caused to be deteriorated,
Thus directly affect reduction effect, when the mean diameter of slag particle is 5～20mm, the temperature of reduction roasting is low, and the time is short.
The temperature of slag particle is 800～1000 DEG C, and hot slag particle can directly carry out reduction roasting, promotes the carrying out of heat transfer and reduction reaction,
Shorten the time of reduction reaction, reduce the energy consumption that reduction roasting processes further.
S300 reduction roasting processes
According to embodiments of the invention, slag particle is delivered to reduction roasting device, contacts with reducing agent, carry out reduction roasting process,
To obtain reducing material, wherein reducing material is made up of metallized pellet and carbonaceous material.Thus, reduction roasting device is utilized
Slag particle is carried out reduction roasting process, makes the oxide of ferrum be reduced to reduced iron.
According to some embodiments of the present invention, reduction roasting device is rotary hearth furnace, this reduction roasting device have medium temperature roast district and
High-temperature roasting district.And then, slag particle through collect after can directly heat be distributed into bottom be covered with on the rotary hearth furnace material bed of reducing agent, fabric thickness
Be 10～40mm, hot slag particle in rotary hearth furnace through in after warm area, high-temperature region be heated to 1150～1350 DEG C, keep
20～40min, complete direct reduction reactor generation metallized pellet, metallized pellet and residue carbonaceous material and discharge the most in the lump and turn the end
Outside stove.
S400 dry type magnetic separation separates
According to embodiments of the invention, described reducing material is carried out dry type magnetic separation, obtain metallized pellet and carbonaceous material.By
This, separate metallized pellet from reducing material, in order to metallized pellet carries out follow-up slag sluicing system.
S500 slag sluicing system
According to embodiments of the invention, described metallized pellet is carried out slag sluicing system, obtain reduced iron and slag.Thus, will be also
Former ferrum is separated from metallized pellet.
According to embodiments of the invention, slag sluicing system is that mill ore magnetic selection separates or molten point of separation.Wherein, mill ore magnetic selection separates gold
Belong to pellet and carry out fine grinding process, obtain fine grinding material, fine grinding material is carried out magnetic separation process, so that material is finely ground,
Magnetic separation obtains reduced iron product after separating；Molten point separates molten point of segregation apparatus of utilization, melts divisional processing by combustion gas, utilize interval to go out
Material mode realizes molten point of ferrum, the separation of melting slag, obtains reduced iron product.
Below with reference to specific embodiment, the present invention will be described, it should be noted that these embodiments are merely illustrative,
And be not considered as limiting the invention.
Embodiment 1
The high-temperature fusion nickel slag discharged in nickel fibers stove prepares reduced iron for raw material, and concrete grammar is as follows:
(1) the high-temperature fusion nickel slag that temperature is 1170～1250 DEG C will discharged in nickel fibers stove, hot directly pouring into slag
In stove；
(2) temperature changed in slag hearth is warming up to 1300～1350 DEG C, by changing slag hearth top-feed mouth, in stove, adds nickel
The 10% of slag weight, granularity is graininess quick lime and the fluorite of 5～10mm, and wherein, the mass ratio of quick lime and fluorite is
5:5, meanwhile, uses the mechanical agitation oar of external application refractory material to insert in slag, the mixed material in molten bath is stirred 10min
After, concurrent heating in stove again, it is incubated the abundant homogenizing of 10min, obtains the mixed melting nickel slag after homogenizing.
(3) the nickel slag after homogenizing is poured in tundish, and in cinder notch flows into pelletizer, control pelletizer rotational speed of rotor and exist
3000～3100 turns/min, discharging the hot slag particle of solidification from pelletizer, granularity is 5～10mm, and temperature is 950～1000 DEG C.
(4) hot slag particle uniformly loads bottom surface to be covered with on anthracitic rotary furnace bottom, hot slag particle layer thickness 10～20mm；
Hot slag particle in rotary hearth furnace through in after warm area, high-temperature region be heated to 1150～1250 DEG C, keep 20min, complete direct-reduction
Reaction generates metallized pellet, metallized pellet and residue carbonaceous material and discharges the most in the lump outside rotary hearth furnace.
(5) product that rotary hearth furnace is discharged is after waste heat recovery, then through dry type magnetic separation isolated metallized pellet and carbonaceous material,
Metallized pellet directly carries out mill ore magnetic selection, available TFe 91%, the reduced iron product of iron recovery 85%.
Embodiment 2
The high-temperature fusion nickel slag discharged in nickel fibers stove prepares reduced iron for raw material, and concrete grammar is as follows:
(1) the high-temperature fusion nickel slag that temperature is 1170～1250 DEG C will discharged in nickel fibers stove, hot directly pouring into slag
In stove.
(2) temperature changed in slag hearth is warming up to 1280～1330 DEG C, by changing slag hearth top-feed mouth, in stove, adds nickel
The 13% of slag weight, granularity is limestone and the calcined soda for industry of 10～15mm, wherein, limestone: the mass ratio of calcined soda for industry
For 10:3, meanwhile, use the mechanical agitation oar of external application refractory material to insert in slag, the mixed material in molten bath is stirred 20min
After, concurrent heating in stove again, it is incubated the abundant homogenizing of 10min, obtains the mixed melting nickel slag after homogenizing.
(3) the nickel slag after homogenizing is poured in tundish, and in cinder notch flows into pelletizer, control pelletizer rotational speed of rotor and exist
3000～3100 turns/min；Discharging the hot slag particle of solidification from pelletizer, granularity is 10～15mm, and temperature is 900～950 DEG C.
(4) hot slag particle uniformly loads bottom surface to be covered with on anthracitic rotary furnace bottom, hot slag particle layer thickness 20～30mm,
Hot slag particle in rotary hearth furnace through in after warm area, high-temperature region be heated to 1200～1300 DEG C, keep 30min, complete direct-reduction
Reaction generates metallized pellet, metallized pellet and residue carbonaceous material and discharges the most in the lump outside rotary hearth furnace.
(5) product that rotary hearth furnace is discharged is after waste heat recovery, then through dry type magnetic separation isolated metallized pellet and carbonaceous material,
Metallized pellet directly carries out mill ore magnetic selection, available TFe 92%, the reduced iron product of iron recovery 88%.
Embodiment 3
The high-temperature fusion nickel slag discharged in nickel fibers stove prepares reduced iron for raw material, and concrete grammar is as follows:
(1) the high-temperature fusion nickel slag that temperature is 1170～1250 DEG C will discharged in nickel fibers stove, hot directly pouring into slag
In stove.
(2) temperature changed in slag hearth is warming up to 1250～1300 DEG C, by changing slag hearth top-feed mouth, in stove, adds nickel
The 20% of slag weight, granularity is the caustic lime block of 15～20mm, uses the mechanical agitation oar of external application refractory material to insert in slag,
After mixed material in molten bath is stirred 20min, concurrent heating in stove again, it is incubated the abundant homogenizing of 10min, after obtaining homogenizing
Mixed melting nickel slag.
(3) the nickel slag after homogenizing is poured in tundish, and in cinder notch flows into pelletizer, control pelletizer rotational speed of rotor and exist
3000～3100 turns/min；Discharging the hot slag particle of solidification from pelletizer, granularity is 15～20mm, and temperature is 950～1000 DEG C.
(4) hot slag particle uniformly loads bottom surface to be covered with on anthracitic rotary furnace bottom, hot slag particle layer thickness 30～40mm；
Hot slag particle in rotary hearth furnace through in after warm area, high-temperature region be heated to 1250～1350 DEG C, keep 40min, complete direct-reduction
Reaction generates metallized pellet, metallized pellet and residue carbonaceous material and discharges the most in the lump outside rotary hearth furnace.
(5) product that rotary hearth furnace is discharged is after waste heat recovery, then through dry type magnetic separation isolated metallized pellet and carbonaceous material,
Metallized pellet is hot directly carries out molten point, available TFe 94%, the reduced iron product of iron recovery 96%.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " concrete example ",
Or specific features, structure, material or the feature bag that the description of " some examples " etc. means to combine this embodiment or example describes
It is contained at least one embodiment or the example of the present invention.In this manual, the schematic representation of above-mentioned term is not necessarily referred to
Be identical embodiment or example.And, the specific features of description, structure, material or feature can be at any one
Or multiple embodiment or example combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: without departing from this
These embodiments can be carried out multiple change in the case of the principle of invention and objective, revise, replace and modification, the present invention's
Scope is limited by claim and equivalent thereof.
Claims (10)
1. the system preparing reduced iron, it is characterised in that including:
Slagging device, described slagging device has melted nickel slag entrance, additive entrance, flux entrance, agitator and mixing
Melted nickel slag outlet；
Pelletizer, described pelletizer has granulation material inlet, stream cinder hole and slag particle outlet, and described granulation material inlet is with described
The outlet of mixed melting nickel slag is connected；
Reduction roasting device, described reduction roasting device has slag particle entrance, reducing agent entrance and reducing material outlet, described slag
Grain entrance is connected with the outlet of described slag particle；
Dry type magnetic separation device, described dry type magnetic separation device has reducing material entrance, metallized pellet outlet and carbonaceous material outlet,
Described reducing material entrance is connected with the outlet of described reducing material；
Slag sluicing system device, described slag sluicing system device has metallized pellet entrance, reduced iron outlet and slag-drip opening, described gold
Belong to pellet entrance to be connected with the outlet of described metallized pellet.
System the most according to claim 1, it is characterised in that farther include:
Storage facility, described storage facility has introducing stream slag grain, scum hole and extraction stream slag grain, described introducing stream slag grain and institute
Stating the outlet of mixed melting nickel slag to be connected, described the stream poor and described granulation material inlet of slag of drawing is connected.
System the most according to claim 1, it is characterised in that described slag sluicing system device is that mill selects segregation apparatus or molten point
Segregation apparatus.
4. utilize the method that the system preparing reduced iron described in any one of claim 1-3 prepares reduced iron, its feature
It is, including:
The melted nickel slag gone out by nickel fibers fire grate is fed directly to slagging device, with additive and flux mix and blend add
Heat treatment, in order to obtain mixed melting nickel slag；
Described mixed melting nickel slag is delivered to pelletizer and carries out granulated processed, in order to obtain slag particle；
Described slag particle is delivered to reduction roasting device, contacts with reducing agent, carry out reduction roasting process, in order to obtain reduzate
Material；
Described reducing material is carried out dry type magnetic separation separation through dry-type magnetic extractor, in order to obtain metallized pellet and carbonaceous material；With
And
Described metallized pellet is carried out slag sluicing system, in order to obtain reduced iron and slag.
Method the most according to claim 4, it is characterised in that described additive and the gross mass of described flux and institute
The mass ratio stating melted nickel slag is (5～25): 100.
Method the most according to claim 4, it is characterised in that the temperature of described melted nickel slag is 1170～1250 DEG C.
Method the most according to claim 4, it is characterised in that the temperature of described mixed melting nickel slag is 1250～1350 DEG C.
Method the most according to claim 4, it is characterised in that the mass ratio of described additive and described flux be (5～
20): (0～5), wherein, described additive is at least one in limestone and quick lime, and described flux is choosing
From at least one of calcined soda for industry and fluorite.
Method the most according to claim 4, it is characterised in that the mean diameter of described slag particle is 5～20mm, temperature
It it is 800～1000 DEG C.
Method the most according to claim 4, it is characterised in that described slag sluicing system is that mill ore magnetic selection separates or molten point point
From.
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