CN110004263A - A kind of technique of red mud fluidized bed process production Iron concentrate - Google Patents

A kind of technique of red mud fluidized bed process production Iron concentrate Download PDF

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Publication number
CN110004263A
CN110004263A CN201910414432.XA CN201910414432A CN110004263A CN 110004263 A CN110004263 A CN 110004263A CN 201910414432 A CN201910414432 A CN 201910414432A CN 110004263 A CN110004263 A CN 110004263A
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red mud
fluidized bed
reduction
iron powder
iron
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CN110004263B (en
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刘俊星
王志
刘涛
曾建武
张放
张崇力
亓建强
贾章椿
时艳
孟祥奎
赵建伟
阎雪飞
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China Aluminum Shandong Engineering Technology Co Ltd
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China Aluminum Shandong Engineering Technology Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/16—Making metallic powder or suspensions thereof using chemical processes
    • B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
    • B22F9/20—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds
    • B22F9/22—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0073—Selection or treatment of the reducing gases
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

A kind of technique of red mud fluidized bed process production Iron concentrate, belongs to technical field of steel production.It is characterized by comprising the following steps: red mud slurry is diluted sieving；Crude iron powder is obtained using the pretreatment mode that gravity separation, magnetic separating or gravity separation and magnetic separating combine；It is dry；The Reduction on Fluidized Bed reaction temperature for restoring fluidized bed is controlled at 450 DEG C ~ 550 DEG C, uses CO+H in reduction fluidized bed2The coal gas for accounting for 40% ~ 50% volume ratio carries out reduction reaction to crude iron powder, and the time of reduction reaction controls the magnetization crude iron powder in 8 min ~ 15min, after being restored；By the magnetization crude iron grinding system to less than 100 mesh after reduction, Iron concentrate of the physical separation up to grade 61% or more is then carried out.The present invention can overcome physical method red mud to select iron powder product quality is relatively low in iron defect and chemical method red mud is greatly lowered to select energy consumption in iron.

Description

A kind of technique of red mud fluidized bed process production Iron concentrate
Technical field
A kind of technique of red mud fluidized bed process production Iron concentrate, belongs to technical field of steel production.
Background technique
Red mud is a kind of insoluble sludge being discharged in alumina producing, 1 ton of aluminium oxide of every production, about generation red mud 1- 1.5 ton.Red mud can be divided into sintering process, Bayer process and combination method red mud from generation technique, and usual main component has Fe2O3, SiO2, Al2O3With CaO etc..Either sintering process, combination method discharge red mud or Bayer process discharge red mud, all have compared with Strong alkalinity, therefore can not directly be utilized.China's red mud is mainly disposed by the way of stockpiling at present, synthesis benefit It is only 4% with rate.Red mud is largely stored up, both land occupation, waste of resource, and easily causes environmental pollution and security risk.But usually In the case of, the red mud iron content that Bayer process generates is higher, is that comprehensive utilization red mud provides up to 20-40%, therefore from recovering iron from red mud The preferred consideration mode in source.
There are physical method and two kinds of chemical method from the major way of recovering iron from red mud at present, physical method refers to using magnetic separation Mode recycles the iron in red mud.Its specific practice is to take out red mud slurry from the sedimentation sink of alumina producing Enter magnetic dressing process out, then enter back into suitable concentration admittedly containing allotment and select iron using the hot water of alumina producer hot water station Process, the iron powder ore pulp selected is concentrated using thickening pond, after filtering means dehydration, can be used as iron powder carry out using.It is this Iron separation technological flowsheet is primarily present following defect: (1) process is relatively simple, poor to the adaptability of red mud, and iron contains in red mud When amount fluctuation is larger, the content that not can guarantee iron in iron powder product is up to standard；(2) due to being that physical method selects iron, the product of iron powder product Position is universal lower, is 50-55%, and mostly di-iron trioxide type, therefore this iron powder is only used for matching for production low side iron product Material.
The major way of chemical method is to red mud magnetizing roast, by the Fe in red mud2O3It is reduced into Fe3O4, then with high intensity Magnetic separation sub-elects iron powder.Its specific practice is to extract red mud slurry from the sedimentation sink of alumina producing out carry out filters pressing After dehydration, drying roller is sent into moisture and is dried to 3% hereinafter, the red mud of drying roller out, carries out reduction treatment into fluidized bed (600 ~ 750 DEG C, 25 ~ 50min), reduction magnetization red mud block is directly entered magnetic separator and carries out magnetic separation separation, in magnetic field strength To carry out magnetic separation under 5000 ~ 15000 Gauss conditions, the Iron concentrate of grade 61% or so is obtained.This iron separation technological flowsheet is mainly deposited In following defect: (1) process is simple, and the high temperature reduction amount of red mud is big, low efficiency, and energy consumption waste is larger, less economical；(2) institute There is red mud to be fluidized, between red mud to be mingled with effect significant, be affected each other, reduction efficiency caused to reduce；(3) after restoring Magnetic separation strength it is higher, reach 5000 ~ 15000 Gausses, energy consumption is higher.
Summary of the invention
The technical problem to be solved by the present invention is overcoming the deficiencies of the prior art and provide, a kind of iron powder product quality is high, energy The technique for consuming low red mud fluidized bed process production Iron concentrate.
The technical solution adopted by the present invention to solve the technical problems is: the work of red mud fluidized bed process production Iron concentrate Skill, which comprises the steps of:
1) it dilutes: red mud slurry is taken out from the sedimentation sink of alumina producing, the solid content of red mud slurry is diluted and is adjusted It saves to 10% ~ 20%, then screens out the coarse granule in red mud slurry with sieving equipment；
2) it pre-processes: the pretreatment that red mud slurry uses gravity separation, magnetic separating or gravity separation and magnetic separating to combine again Mode obtains crude iron powder；
3) dry: drying makes the moisture of crude iron powder less than 4%；
4) Reduction on Fluidized Bed: the Reduction on Fluidized Bed reaction temperature for restoring fluidized bed is controlled at 450 DEG C ~ 550 DEG C, is made in reduction fluidized bed Use CO+H2 Account for the coal gas of 40% ~ 50% volume ratio and reduction reaction carried out to crude iron powder, the time control of reduction reaction 8 min ~ 15min, the magnetization crude iron powder after being restored；
5) it grinds and sorts: by the magnetization crude iron grinding system to less than 100 mesh after reduction, carrying out physical separation then up to grade In 61% or more Iron concentrate.
A kind of technique of red mud fluidized bed process production Iron concentrate of the invention can overcome physical method red mud to select iron powder in iron The relatively low defect of product quality, and chemical method red mud can be greatly lowered and select energy consumption in iron, have more the process flow There are reasonability, practicability, economy.The present invention is first to be pre-processed using the method for weight magnetic separation to red mud, obtains crude iron Fine ore slurry, makes the ferro element in red mud obtain preliminary enrichment.In this way can the red mud in advance by unsuitable sorting abandon, Greatly reduce the red mud amount into fluid bed reduction, system energy consumption is effectively reduced.Crude iron fine ore is starched again after carrying out filter-press dehydration, It is sent into drying roller and moisture is dried to 3% hereinafter, the crude iron powder of drying roller out, carries out reduction treatment, reduction into fluidized bed Crude iron powder afterwards enters magnetic separator after grinding and carries out magnetic separation separation, in the case where magnetic field strength is 1000-3000 Gauss conditions Magnetic separation is carried out, the Iron concentrate of 61% or more grade is obtained.
Preferably, the solid content dilution of red mud slurry is adjusted to 15% ~ 18% described in step 1).After preferred dilution Solid content not only improves pretreatment, and can reduce the use of water resource as far as possible.
Preferably, the pretreatment mode that gravity separation described in step 2 and magnetic separating combine are as follows: red after sieving Mud ore pulp send to hydrocyclone and carries out Gravity Separation, and overflow is sent back in the washing settling groove of the alumina producing of step 1) and is used for Dilute red mud slurry；Underflow carries out magnetic separation, and magnetic separation magnetic field strength is that 1000 ~ 3000 Gausses complete red mud after dehydration Pretreatment, obtains crude iron powder.Obtain the ferro element in red mud in the case that energy consumption is minimum under preferred pretreatment mode higher Enrichment.
Preferably, the magnetic separation magnetic field strength is 1500 ~ 2000 Gausses.Magnetic field strength is under preferred pretreatment mode 1500 ~ 2000 Gausses can make the ferro element in red mud obtain higher enrichment.
Preferably, drying described in step 3) makes the moisture of crude iron powder less than 3%.Preferred drying regime is conducive to flow Change reduction.
Preferably, CO+H in coal gas described in step 4)2Volume ratio and reaction temperature be in inversely prroportional relationship.That is coal gas Middle CO+H2Volume ratio change with reaction temperature, reaction temperature is lower, CO+H in coal gas2Volume ratio it is bigger.This can be more preferable Guarantee Reduction on Fluidized Bed reduction rate.
Preferably, the time of reduction reaction described in step 4) controls in 10 min ~ 12min.
Preferably, physical separation is that gravity separation, magnetic separating or the mode of flotation separate in step 5).
Compared with prior art, beneficial to effect possessed by a kind of technique of red mud fluidized bed process of the invention production Iron concentrate Fruit is:
The present invention provides a kind of technique of red mud fluidized bed process production Iron concentrate, is related to extracting the gentle base of iron powder in red mud directly also Original production Iron concentrate field.The process both can solve physical method red mud and mention that iron iron powder grade produced is relatively low to ask The problem of inscribing, and can solve chemical reduction method high expensive, red mud utilize the Iron concentrate product grade of process production Up to 61% or more, it is suitable that the quality of iron ore material used is produced with steel plant.
This technique is to the adaptable of raw material.The content range of iron is very wide in red mud, can be from 10%-40%, even more It is more.According to the method that conventional physics mentions iron, the grade of iron and the content correlation of iron in raw material are very strong in iron powder product, Maximum is 54% or so, but as the content of iron in red mud raw material declines, and the grade of iron has very big therewith in iron powder product The decline of degree, in addition drop to 45% hereinafter, cause defect ware even waste product, can not be utilized.According to the main of chemical method Mode be to red mud magnetizing roast, though grade can be obtained in 61% or so more stable Iron concentrate, this iron separation technological flowsheet The high temperature reduction amount of middle red mud is big, low efficiency, and energy consumption waste is larger, less economical.It is above with the grade decline of iron in red mud Negative effect it is bigger.And for the present invention, the about 1/2-2/3 red mud for being not suitable for sorting is carried out using pretreating process It abandons, makes the grade of iron in red mud obtain being enriched with for the first time, greatly reduce the red mud amount into fluid bed reduction；It is roasted by reduction Second of enrichment for realizing Iron grade is burnt, while system energy consumption is effectively reduced；Magnetization crude iron powder after reduction grind and Physical separation realizes the third time enrichment of Iron grade, obtains Iron concentrate of the grade 61% or more.The process being enriched with three times makes it There is very strong adaptability to the red mud of different grades.
Abandoning 1/2-2/3 in advance in pretreatment stage due to this technique does not have the red mud of washability, makes to enter in fluidized bed The red mud amount for carrying out reduction reaction is greatly lowered, simultaneously because being mingled with the decrease of effect, reduces the temperature of Reduction on Fluidized Bed (450-550 DEG C), time reduce (8-15min), energy consumption level when far below usual chemical roasting method reduction, therefore the present invention Low energy consumption for technology, to reduce production cost.
The present invention uses coal gas for reducing agent, avoids making reducing agent using coal or coke, therefore makes phosphorus sulphur in iron powder product Content is far below traditional roasting process.
The present invention can according to the iron content in pretreated crude iron powder come the temperature of flexible modulation reduction reaction, the time and Gas composition achievees the purpose that corresponding product quality.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
The present invention will be further described combined with specific embodiments below, and wherein embodiment 1 is most preferred embodiment.
Referring to attached drawing 1: currently preferred process flow are as follows: the dilution of red mud slurry: by red mud slurry from alumina producing Sedimentation sink in take out, using process following cycle come red mud filter pressing filtrate as adjust red mud solids in pulp use The dilution of red mud solids in pulp is adjusted and arrives suitable concentration 10% ~ 20%, then removes thick in red mud slurry with sieving equipment by water Grain；The pretreatment of red mud includes cyclonic separation and a magnetic separation and dehydration, dilutes the red mud ore pulp regulated, controls suitable pressure Power is sent to hydrocyclone and carries out Gravity Separation, and overflow throws tail as primary, and underflow is sent to magnetic separator in certain magnetic field condition Lower carry out magnetic separation completes the pretreatment of red mud after dehydration, obtains crude iron powder；The tailing of magnetic separation as secondary throwing tail and The primary washing settling groove progress subsequent processing thrown tail and send alumina producing back to.The drying of crude iron powder makes the moisture control of crude iron powder System after less than 4%, using fluidized bed coal gas carry out crude iron powder Reduction on Fluidized Bed, Reduction on Fluidized Bed reaction temperature control 450 DEG C ~ 550 DEG C, using containing CO+H2 The coal gas of 40% ~ 50% volume ratio restores crude iron powder, and the time of reduction reaction controls 8 Min ~ 15min, the crude iron powder after being magnetized.Crude iron powder after magnetization is ground and secondary physical separates, after reduction Magnetization crude iron powder ground less than 100 mesh, then carry out physics point using the modes such as low intensity magnetic separation of 1000 ~ 3000 Gausses From, obtain grade 61% or so Iron concentrate and three times throw tail, the raw material that Iron concentrate is produced as steel plant.
Embodiment 1
1) it dilutes: the red mud ingredient that the present embodiment uses: TFe 16.33%, SiO2 17.21%、Al2O319.91%, other a small amount of； Red mud slurry is taken out from the sedimentation sink of alumina producing, the solid content dilution of red mud slurry is adjusted to 16%, then is used Sieving equipment screens out the coarse granule in red mud slurry；
2) pre-process: the red mud ore pulp after sieving send to hydrocyclone and carries out Gravity Separation, and the oxidation of step 1) is sent in overflow back to For diluting red mud slurry in the washing settling groove of aluminium production；Underflow carries out magnetic separation, and magnetic separation magnetic field strength is 1600 Gausses, through de- After water process, the pretreatment of red mud is completed, obtains crude iron powder；By the pretreatment that red mud carries out cyclonic separation and magnetic separation separation combines Afterwards, its essential element content of crude iron powder: Fe 42.73%, Al 9.45%, Si 7.67%, Na 5.59%, Ca 4.79%, Ti is obtained 2.07%,Mg 0.89%,K 0.34%,Mn 0.30%；
3) dry: drying makes the moisture of crude iron powder less than 3%；
4) Reduction on Fluidized Bed: the Reduction on Fluidized Bed reaction temperature for restoring fluidized bed is controlled at 500 DEG C, uses CO+ in reduction fluidized bed H2 Account for 45% volume ratio (H2 20%、N2 48%、CO 25%、CO27%) coal gas carries out reduction reaction, fluidizing gas velocity to crude iron powder For 0.1m/s, the time of reduction reaction controls the magnetization crude iron powder in 11min, after being restored；
5) it grinds and sorts: the crude iron powder after magnetization being ground less than 100 mesh, is then carried out under 1100 gaussian intensities Magnetic separation separation, obtains the index of Iron concentrate: Iron concentrate yield 62.03%, grade 63.88%, the rate of recovery 84.67%；Final products iron Fine powder meets the ingredient requirement produced as steel plant.
Embodiment 2
1) it dilutes: the red mud ingredient that the present embodiment uses: TFe 16.33%, SiO2 17.21%、Al2O319.91%, other a small amount of； Red mud slurry is taken out from the sedimentation sink of alumina producing, the solid content dilution of red mud slurry is adjusted to 18%, then is used Sieving equipment screens out the coarse granule in red mud slurry；
2) pre-process: the red mud ore pulp after sieving send to hydrocyclone and carries out Gravity Separation, and the oxidation of step 1) is sent in overflow back to For diluting red mud slurry in the washing settling groove of aluminium production；Underflow carries out magnetic separation, and magnetic separation magnetic field strength is 1500 Gausses, through de- After water process, the pretreatment of red mud is completed, obtains crude iron powder；By the pretreatment that red mud carries out cyclonic separation and magnetic separation separation combines Afterwards, its essential element content of crude iron powder: Fe 42.69%, Al 9.46%, Si 7.68%, Na 5.55%, Ca 4.82%, Ti is obtained 2.08%,Mg 0.90%,K 0.35%,Mn 0.30%；
3) dry: drying makes the moisture of crude iron powder less than 3%；
4) Reduction on Fluidized Bed: the Reduction on Fluidized Bed reaction temperature for restoring fluidized bed is controlled at 480 DEG C, uses CO+ in reduction fluidized bed H2 Account for 48% volume ratio (H2 19%、N2 48%、CO 29%、CO24%) coal gas carries out reduction reaction, fluidizing gas velocity to crude iron powder For 0.1m/s, the time of reduction reaction controls the magnetization crude iron powder in 12min, after being restored；
5) it grinds and sorts: the crude iron powder after magnetization being ground less than 100 mesh, is then carried out under 1100 gaussian intensities Magnetic separation separation, obtains the index of Iron concentrate: Iron concentrate yield 62.01%, grade 63.85%, the rate of recovery 84.65%；Final products iron Fine powder meets the ingredient requirement produced as steel plant.
Embodiment 3
1) it dilutes: the red mud ingredient that the present embodiment uses: TFe 16.33%, SiO2 17.21%、Al2O319.91%, other a small amount of； Red mud slurry is taken out from the sedimentation sink of alumina producing, the solid content dilution of red mud slurry is adjusted to 15%, then is used Sieving equipment screens out the coarse granule in red mud slurry；
2) pre-process: the red mud ore pulp after sieving send to hydrocyclone and carries out Gravity Separation, and the oxidation of step 1) is sent in overflow back to For diluting red mud slurry in the washing settling groove of aluminium production；Underflow carries out magnetic separation, and magnetic separation magnetic field strength is 2000 Gausses, through de- After water process, the pretreatment of red mud is completed, obtains crude iron powder；By the pretreatment that red mud carries out cyclonic separation and magnetic separation separation combines Afterwards, its essential element content of crude iron powder: Fe 42.70%, Al 9.45%, Si 7.68%, Na 5.57%, Ca 4.82%, Ti is obtained 2.06%,Mg 0.91%,K 0.34%,Mn 0.31%；
3) dry: drying makes the moisture of crude iron powder less than 3%；
4) Reduction on Fluidized Bed: the Reduction on Fluidized Bed reaction temperature for restoring fluidized bed is controlled at 420 DEG C, uses CO+ in reduction fluidized bed H2 Account for 42% volume ratio (H2 16%、N2 51%、CO 26%、CO27%) coal gas carries out reduction reaction, fluidizing gas velocity to crude iron powder For 0.1m/s, the time of reduction reaction controls the magnetization crude iron powder in 10 min, after being restored；
5) it grinds and sorts: the crude iron powder after magnetization being ground less than 100 mesh, is then carried out under 1300 gaussian intensities Magnetic separation separation, obtains the index of Iron concentrate: Iron concentrate yield 62.00%, grade 63.84%, the rate of recovery 84.64%；Final products iron Fine powder meets the ingredient requirement produced as steel plant.
Embodiment 4
1) it dilutes: the red mud ingredient that the present embodiment uses: TFe 16.33%, SiO2 17.21%、Al2O319.91%, other a small amount of； Red mud slurry is taken out from the sedimentation sink of alumina producing, the solid content dilution of red mud slurry is adjusted to 10%, then is used Sieving equipment screens out the coarse granule in red mud slurry；
2) pre-process: the red mud ore pulp after sieving send to hydrocyclone and carries out Gravity Separation, and the oxidation of step 1) is sent in overflow back to For diluting red mud slurry in the washing settling groove of aluminium production；Underflow carries out magnetic separation, and magnetic separation magnetic field strength is 3000 Gausses, through de- After water process, the pretreatment of red mud is completed, obtains crude iron powder；By the pretreatment that red mud carries out cyclonic separation and magnetic separation separation combines Afterwards, its essential element content of crude iron powder: Fe 42.53%, Al 9.63%, Si 7.82%, Na 5.61%, Ca 4.82%, Ti is obtained 2.08%,Mg 0.88%,K 0.34%,Mn 0.32%；
3) dry: drying makes the moisture of crude iron powder less than 4%；
4) Reduction on Fluidized Bed: the Reduction on Fluidized Bed reaction temperature for restoring fluidized bed is controlled at 450 DEG C, uses CO+ in reduction fluidized bed H2 Account for 50% volume ratio (H2 20%、N2 48%、CO 30%、CO22%) coal gas carries out reduction reaction to crude iron powder, and fluidizing gas velocity is 0.1m/s, the time of reduction reaction control the magnetization crude iron powder in 8 min, after being restored；
5) it grinds and sorts: the crude iron powder after magnetization being ground less than 100 mesh, is then carried out under 1100 gaussian intensities Magnetic separation separation, obtains the index of Iron concentrate: Iron concentrate yield 60.11%, grade 61.81%, the rate of recovery 83.24%；Final products iron Fine powder meets the ingredient requirement produced as steel plant.
Embodiment 5
1) it dilutes: the red mud ingredient that the present embodiment uses: TFe 16.33%, SiO2 17.21%、Al2O319.91%, other a small amount of； Red mud slurry is taken out from the sedimentation sink of alumina producing, the solid content dilution of red mud slurry is adjusted to 20%, then is used Sieving equipment screens out the coarse granule in red mud slurry；
2) pre-process: the red mud ore pulp after sieving send to hydrocyclone and carries out Gravity Separation, and the oxidation of step 1) is sent in overflow back to For diluting red mud slurry in the washing settling groove of aluminium production；Underflow carries out magnetic separation, and magnetic separation magnetic field strength is 1000 Gausses, through de- After water process, the pretreatment of red mud is completed, obtains crude iron powder；By the pretreatment that red mud carries out cyclonic separation and magnetic separation separation combines Afterwards, its essential element content of crude iron powder: Fe 42.44%, Al 9.48%, Si 7.76%, Na 5.95%, Ca 4.83%, Ti is obtained 2.09%,Mg 0.91%,K 0.36%,Mn 0.31%；
3) dry: drying makes the moisture of crude iron powder less than 4%；
4) Reduction on Fluidized Bed: the Reduction on Fluidized Bed reaction temperature for restoring fluidized bed is controlled at 550 DEG C, uses CO+ in reduction fluidized bed H2 Account for 40% volume ratio (H2 15%、N2 52%、CO 25%、CO28%) coal gas carries out reduction reaction, fluidizing gas velocity to crude iron powder For 0.1m/s, the time of reduction reaction controls the magnetization crude iron powder in 15min, after being restored；
5) it grinds and sorts: the crude iron powder after magnetization being ground less than 100 mesh, is then carried out under 1100 gaussian intensities Magnetic separation separation, obtains the index of Iron concentrate: Iron concentrate yield 62.03%, grade 63.88%, the rate of recovery 84.67%；Final products iron Fine powder meets the ingredient requirement produced as steel plant.
Embodiment 6
The red mud ingredient that the present embodiment uses: TFe 17.21%, SiO2 16.86%、Al2O319.03%, other a small amount of；
After the pretreatment that red mud is carried out to cyclonic separation, its essential element content of crude iron powder: Fe 31.07%, Al is obtained 11.82%,Si 9.31%,Na 7.21%,Ca9.08%,Ti2.40%,Mg0.65%,K0.58%,Mn0.65%；
Component H is used in reduction fluidized bed2 15%、N2 52%、CO 25%、CO28% coal gas and fluidizing gas velocity is 0.2m/s Crude iron powder is restored, 500 DEG C of reduction temperature, the reaction time is roasting condition in 15min；
Crude iron powder after magnetization is ground less than 100 mesh, magnetic separation separation is then carried out under 1100 gaussian intensities, is obtained The index of Iron concentrate: Iron concentrate yield 36.94%, grade 61.59%, the rate of recovery 68.82%；Final products Iron concentrate meets conduct The ingredient requirement of steel plant's production.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc. Imitate embodiment.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to above embodiments institute Any simple modification, equivalent variations and the remodeling made, still fall within the protection scope of technical solution of the present invention.

Claims (8)

1. a kind of technique of red mud fluidized bed process production Iron concentrate, which comprises the steps of:
1) it dilutes: red mud slurry is taken out from the sedimentation sink of alumina producing, the solid content of red mud slurry is diluted and is adjusted It saves to 10% ~ 20%, then screens out the coarse granule in red mud slurry with sieving equipment；
2) it pre-processes: the pretreatment that red mud slurry uses gravity separation, magnetic separating or gravity separation and magnetic separating to combine again Mode obtains crude iron powder；
3) dry: drying makes the moisture of crude iron powder less than 4%；
4) Reduction on Fluidized Bed: the Reduction on Fluidized Bed reaction temperature for restoring fluidized bed is controlled at 450 DEG C ~ 550 DEG C, is made in reduction fluidized bed Use CO+H2 Account for the coal gas of 40% ~ 50% volume ratio and reduction reaction carried out to crude iron powder, the time control of reduction reaction 8 min ~ 15min, the magnetization crude iron powder after being restored；
5) it grinds and sorts: by the magnetization crude iron grinding system to less than 100 mesh after reduction, carrying out physical separation then up to grade In 61% or more Iron concentrate.
2. a kind of technique of red mud fluidized bed process production Iron concentrate according to claim 1, it is characterised in that: in step 1) Described adjusts the solid content dilution of red mud slurry to 15% ~ 18%.
3. a kind of technique of red mud fluidized bed process production Iron concentrate according to claim 1, it is characterised in that: in step 2 The pretreatment mode that the gravity separation and magnetic separating combine are as follows: the red mud ore pulp after sieving send to hydrocyclone and carries out Gravity Separation, overflow are sent back in the washing settling groove of the alumina producing of step 1) for diluting red mud slurry；Underflow carries out magnetic Choosing, magnetic separation magnetic field strength are that 1000 ~ 3000 Gausses complete the pretreatment of red mud after dehydration, obtain crude iron powder.
4. a kind of technique of red mud fluidized bed process production Iron concentrate according to claim 3, it is characterised in that: the magnetic Selecting magnetic field strength is 1500 ~ 2000 Gausses.
5. a kind of technique of red mud fluidized bed process production Iron concentrate according to claim 1, it is characterised in that: in step 3) The drying makes the moisture of crude iron powder less than 3%.
6. a kind of technique of red mud fluidized bed process production Iron concentrate according to claim 1, it is characterised in that: in step 4) CO+H in the coal gas2Volume ratio and reaction temperature be in inversely prroportional relationship.
7. a kind of technique of red mud fluidized bed process production Iron concentrate according to claim 1, it is characterised in that: in step 4) The time of the reduction reaction controls in 10 min ~ 12min.
8. a kind of technique of red mud fluidized bed process production Iron concentrate according to claim 1, it is characterised in that: in step 5) Physical separation is that gravity separation, magnetic separating or the mode of flotation separate.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111320213A (en) * 2020-02-17 2020-06-23 彭思尧 Comprehensive treatment method and system for red mud resource utilization

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