CN107760862A - A kind of method from recovering iron from red mud - Google Patents
A kind of method from recovering iron from red mud Download PDFInfo
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- CN107760862A CN107760862A CN201710976695.0A CN201710976695A CN107760862A CN 107760862 A CN107760862 A CN 107760862A CN 201710976695 A CN201710976695 A CN 201710976695A CN 107760862 A CN107760862 A CN 107760862A
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- red mud
- magnetic separation
- suspension roaster
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/005—Pretreatment specially adapted for magnetic separation
- B03C1/015—Pretreatment specially adapted for magnetic separation by chemical treatment imparting magnetic properties to the material to be separated, e.g. roasting, reduction, oxidation
Abstract
The present invention relates to a kind of method from recovering iron from red mud, belong to technical field of mineral processing.A kind of method from recovering iron from red mud, methods described include：In suspension roaster, the red mud material through magnetic separation is subjected to pre-oxidation treatment in air atmosphere, the siderite in red mud material and limonite is completely converted into bloodstone；Using the heat saved through pre-oxidation treatment resulting material itself, reduction treatment is carried out to it in reducibility gas atmosphere, it is Fe to make the bloodstone Restore All in material3O4；In air atmosphere, resulting material is subjected to re-oxidation processing, makes at least part Fe in material3O4It is converted into γ Fe2O3；Magnetic separation processing is carried out to resulting material after above-mentioned steps processing.The method of the invention solves the problems such as higher long roasting time present in the process of existing processing red mud recovery Iron concentrate, temperature height, reducibility gas CO contents, valuable element loss and high energy consumption.
Description
Technical field
The present invention relates to a kind of method from recovering iron from red mud, belong to technical field of mineral processing.
Background technology
Red mud is caused solid slag in aluminum oxide production process, is taken on a red color because containing a large amount of iron oxide, therefore be referred to as
Red mud.In China, the red mud that 1t aluminum oxide about gives off 1.0~1.8t is often produced.It is estimated that the whole world discharge every year it is red
Mud is more than 70,000,000 t, the red mud that China's aluminum i ndustry discharges every year about 60,000,000 t.At present, a large amount of red muds use outdoor stockpiling
Mode handle, do not form effective processing mode also.In addition, cannot profit containing substantial amounts of valuable metal in red mud
With causing the waste of resource.As China's red mud adds up the increase of volume of cargo in storage, the comprehensive exploitation for carrying out red mud has weight with utilizing
The economic value and social effect wanted.
Category iron resource shortage country of China, as the fast development of steel and iron industry, iron resource growing tension are most of to rely on
Import, price also constantly rise, and iron content is about 18%~35% in red mud, and this part iron discharges with red mud, not only dirty
Environment is contaminated, and causes the huge waste of resource.Therefore, developing a kind of process of iron in recyclable red mud and being one has
The work of important social effect and economic value.
So far, the recovery to iron resource in red mud both at home and abroad has carried out substantial amounts of research and discussion, from domestic granddad
From the point of view of opening patent and publishing thesis, mainly there are following three kinds from the method for recovering iron from red mud resource：1) direct smelting process.As specially
Sharp CN103074456A disclose it is a kind of by additives such as drying, ball processed, addition coke in blast furnace with 1500~1650 DEG C
Directly carry out melting and obtain ferrous metal, the method has the problem of high energy consumption.2) magnetic method.As patent CN101648159A is disclosed
A kind of method that iron ore concentrate is reclaimed from alumina laterite, magnetomechanical recovery ferromagnetism iron ore concentrate returns with high-gradient magnetic separation in utilization
The iron ore concentrate in the process recovery red mud that weak magnetic separation iron concentrate combines is received, the method has the problem of iron recovery is low (iron
The rate of recovery is 28~35%).3) magnetizing roast-magnetic method.Mainly use three process routes.One process line is low temperature bar
Under part (350 DEG C~400 DEG C of the moon), red mud coal blending, carbon, wood sawdust, bagasse make solid phase reduction medium, and the red mud after reduction is through magnetic
Select recyclable iron.Red mud kinetics during 350 DEG C~400 DEG C of low-temperature bake is poor, and the required reaction time is longer,
Energy resource consumption is big.Article 2 process route is under the conditions of high temperature (about 950 DEG C~1000 DEG C), and Bayer process red mud coal blending carries out straight
Reduction roasting is connect, product of roasting is cooled to room temperature under conditions of starvation, and roasted ore fine grinding obtains after magnetic separation in magnetic separator
To sponge iron.The sintering temperature control of this process route is while metallic iron is generated for 950 DEG C~1000 DEG C, namagnetic substance
Reach or can block and bond reactor close to fusing point, the liquid namagnetic substance slag of formation, reduction reaction process is difficult to continuously
Change and carry out.Article 3 process route is at a temperature of 700 DEG C~850 DEG C, and the red mud powder after drying or red mud block are being reduced
Reduction magnetization is calcined in atmosphere.Chinese patent CN102626670A discloses a kind of rotary kiln magnetizing roast processing red mud and prepares iron
The method of fine powder, this method reaction time are longer (25~50min), it is desirable to reducing atmosphere in CO content it is of a relatively high
(15%~25%), energy resource consumption is big；Enter kiln red mud block in below 10mm, and red mud inherently granularity is less than 0.02mm
Grain accounts for more than 65% fine powder, and during rotary kiln running, red mud block will certainly collide efflorescence, ring formation, skinning under high temperature,
Deteriorate operating mode.Chinese invention patent CN102628907A discloses a kind of recirculating fluidized bed magnetizing roast processing red mud and prepares iron essence
The method of powder, red mud pre- thermomagnetization after directly drying, this method are not dealt with to the substantial amounts of alkali of red mud, the alkali metal ion such as potassium sodium
In roasting process, the problem of skinning is lumpd after vaporization-condensation be present；And this method equally exist the reaction time it is longer (25~
50min), material recirculating fluidized bed domestic demand iterative cycles be calcined, it is desirable to reducing atmosphere in CO content of a relatively high (16%
~22%), the problem of energy resource consumption.In addition, both the above magnetizing roast processing is Bayer of the iron content more than 30%
Method iron red mud, for the red mud of low iron-holder of the iron-holder below 30%, it is reduced directly and is calcined with above method, Shi Bizao
Energy consumption into unit roasting mineral products is higher, and because the entrainment effect of microfine during magnetic separation after roasting causes Product recycling
Rate is relatively low.Chinese invention patent CN201510124963.7 discloses a kind of flash magnetization roasting processing red mud and prepares Iron concentrate
Method, red mud is enriched, except alkali, dry and obtain iron ore concentrate through low intensity magnetic separation after powder processed, preheating shower roasting, this method is after removing alkali
A large amount of valuable elements are caused to be lost in, it is impossible to which the high efficiente callback for reaching mineral utilizes；And the iron preservation in most of red mud is in red iron
In ore deposit or limonite, the method for roasting does not ensure that the homogeneity of iron mineral reduction, the application of this method is had necessarily yet
Limitation.
In summary, in the process of existing processing red mud recovery Iron concentrate, long roasting time, temperature height be present, go back
Originality gas CO contents are higher, valuable element is lost in and the problems such as high energy consumption.
The content of the invention
It is an object of the present invention to provide a kind of method from recovering iron from red mud, specially-three sections of suspensions of the preenrichment of red mud
Roasting-magnetic separation processing method, by the way that red mud is first carried out into high intensity magnetic separation ,-reduced-then through pre-oxidation and reoxidize suspension roasting-magnetic
Technique is selected, obtains the higher iron ore concentrate of sorting index.
A kind of method from recovering iron from red mud, methods described include：
In suspension roaster, the red mud material through magnetic separation is subjected to pre-oxidation treatment in air atmosphere, makes red mud thing
Siderite and limonite in material are completely converted into bloodstone；Using the heat saved through pre-oxidation treatment resulting material itself,
Reduction treatment is carried out to it in reducibility gas atmosphere, it is Fe to make the bloodstone Restore All in material3O4；In air atmosphere
In, resulting material is subjected to re-oxidation processing, makes at least part Fe in material3O4It is converted into γ-Fe2O3；
Magnetic separation processing is carried out to resulting material after above-mentioned steps processing.
" suspension roaster " of the present invention can be the device of any achievable particle suspension roasting disclosed in prior art,
And file can be made according to disclosed in prior art, it is also commercially available.
Red mud material of the present invention carries out a high intensity magnetic separation before oxidation processes are carried out, and concentrate obtained by high intensity magnetic separation is entered
Row pre-oxidation treatment, the high intensity magnetic separation are preferably：By red mud ore grinding to granularity -0.074mm (referring to granularity in below 0.074mm)
Part accounts for the 40~80% of gross weight, then carries out high intensity magnetic separation, and high intensity magnetic separation magnetic field intensity is 318~637kA/m, obtains high intensity magnetic separation
Concentrate and high intensity magnetic separation mine tailing.
In the above method, high intensity magnetic separation concentrate is the mixed material containing bloodstone and limonite.
The purpose of the step of pre-oxidation treatment of the present invention is that the siderite in red mud material and limonite is all
Bloodstone (Fe2O3), it is preferably carried out as follows：In suspension roaster, material is heated to 450 in air atmosphere
~800 DEG C, 10~120s is incubated, the siderite in red mud material and limonite is completely converted into bloodstone.
Further, the pre-oxidation treatment is：High intensity magnetic separation concentrate is put into suspension roaster, into suspension roaster
Air is passed through, it is in suspended state to make material；Material in suspension roaster is heated to 450~800 DEG C of progress preoxidized roasts, this
When suspension roaster in be oxidizing atmosphere, the time of pre-oxidation is 10~120s.
Further, preferably described air intake is 0.8~2m/s by flow velocity of the air in suspension roaster.
The purpose of reduction treatment of the present invention is to make the bloodstone Restore All in material be Fe3O4, it is preferably by following
Method is carried out：Stop heating after the completion of insulation, make the gas atmosphere in suspension roaster be reducibility gas atmosphere, reduction treatment
5~60s, it is Fe to make the bloodstone Restore All in material3O4。
Further, heating is stopped after the completion of pre-oxidation treatment insulation, being passed through nitrogen displacement into suspension roaster goes out sky
Gas；Then reducibility gas is passed through into suspension roaster, material is in suspension loose condition (of surface), utilizes material itself savings
Heat is reduced, and the recovery time is 5~60 seconds.
Further, continue to be passed through the flow of nitrogen, reducibility gas and nitrogen while reducibility gas is passed through
Than for 1:1~10.Further, the intake of preferably above-mentioned mixed gas is by flow velocity of the air in suspension roaster
0.8~2m/s.
The purpose of the present invention reoxidized is to make Fe3O4At least partly it is converted into γ-Fe2O3, further, reoxidize
γ-Fe after step2O3Weight content account for 50~90%, Fe of whole materials3O4Weight content account for whole materials 5~45%,
It is preferably carried out as follows：When material is down into 250~400 DEG C, suspension roaster is in air atmosphere, make material
Middle at least part Fe3O4It is converted into γ-Fe2O3；Continue to be cooled to less than 100 DEG C, take out material.
Further, the processing step that reoxidizes is：Reduction stops being passed through reducibility gas after terminating, to suspension roasting
Nitrogen displacement is passed through in stove and goes out unreacted residual reducing gas, by the cooling water of suspension roaster chuck to suspension roasting
Stove cools, and when temperature is down to 250~400 DEG C, into suspension roaster being passed through air is reoxidized, when in suspension roaster
Material when being cooled to less than 100 DEG C, material is taken out and carries out secondary grinding.
Further, preferably described air intake is 0.8~2m/s by flow velocity of the air in suspension roaster.
It is of the present invention to be from the preferable technical scheme of method one of recovering iron from red mud：Methods described includes following works
Skill step：
(1) pre- magnetic separation：Red mud ore grinding to granularity -0.074mm part are accounted for the 40~80% of gross weight, then carried out strong
Magnetic separation, high intensity magnetic separation magnetic field intensity are 318~637kA/m, obtain high intensity magnetic separation concentrate and high intensity magnetic separation mine tailing；
(2) pre-oxidize：High intensity magnetic separation concentrate is put into suspension roaster, air is passed through into suspension roaster, makes material
In suspended state；Material in suspension roaster is heated to 450~800 DEG C of progress preoxidized roasts, now in suspension roaster
For oxidizing atmosphere, the time of pre-oxidation is 10~120s；
(3) accumulation of heat reduces：Stop heating after the completion of insulation, being passed through nitrogen displacement into suspension roaster goes out air；Then
Reducibility gas is passed through into suspension roaster, material is in suspension loose condition (of surface), the heat saved using material itself is entered
Row reduction, recovery time are 5~60 seconds；
(4) reoxidize：Reduction stops being passed through reducibility gas after terminating, and nitrogen displacement is passed through into suspension roaster and is gone out not
The residual reducing gas of reaction, suspension roaster is cooled by the cooling water of suspension roaster chuck, when temperature is down to 250
At~400 DEG C, into suspension roaster being passed through air is reoxidized, when the material in suspension roaster be cooled to 100 DEG C with
When lower, material is taken out and carries out secondary grinding；
(5) magnetic separation again：When the material after secondary grinding to granularity -0.023mm part account for the 40~80% of gross weight,
Material after secondary grinding is subjected to second of magnetic separation under the conditions of 60~100kA/m of magnetic field intensity, obtains secondary magnetic concentrate
With secondary magnetic tailing.
In above-mentioned technical proposal, continue to be passed through nitrogen while being passed through reducibility gas in preferably described step (3), reduce
Property gas and nitrogen flow-rate ratio be 1:1~10.
In above-mentioned technical proposal, reaction heat is released in the reaction that reoxidizes in preferred steps (4), with suspension roaster chuck
Cooling water carries out heat exchange, is converted into vapor recovery.
In all technical schemes of the present invention, preferably described reducibility gas is carbon monoxide.
It is to suspension roaster by material heating in suspension roaster in method of the present invention from recovering iron from red mud
Inside it is passed through liquefied gas and lights and is heated.
In method of the present invention from recovering iron from red mud, pre-oxidize, reduce and reoxidize in suspension roaster
Thought, during, circulation has cooling water all the time in the chuck of suspension roaster.
In method of the present invention from recovering iron from red mud, pre-oxidation makes siderite and limonite be completely converted into red iron
The reaction equation that ore deposit, wherein siderite react is：
FeCO3(s)=FeO (s)+CO2(g) (1)
3FeCO3(s)=Fe3O4(s)+CO(g)+2CO2(g) (2)
4FeO(s)+O2(g)=2Fe2O3(s) (3)
Fe3O4(s)+O2(g)=2Fe2O3 (4)
Siderite is first decomposed by formula (1) and (2) reacts generation Fe3O4Or FeO, formula (3) and (4) oxygen are then pressed again
Turn to Fe2O3；
The reaction equation that limonite reacts is：
Fe2O3·2H2O (s)=Fe2O3(s)+2H2O(g) (5)
Limonite is converted into Fe2O3。
In method of the present invention from recovering iron from red mud, the reaction equation of reduction is：
3Fe2O3(s)+CO (g)=2Fe3O4(s)+CO2(g) (6)
Fe in material2O3It is reduced to Fe3O4。
In method of the present invention from recovering iron from red mud, in the material after reoxidizing main component be Armco magnetic iron γ-
Fe2O3And Fe3O4；Wherein γ-Fe2O3Weight content in 50~90%, Fe3O4Weight content 5~45%.
In method of the present invention from recovering iron from red mud, the reaction that reoxidizes release a large amount of reaction heat, roasted with suspending
The cooling water for burning stove chuck carries out heat exchange, is converted into vapor recovery.
In method of the present invention from recovering iron from red mud, by secondary grinding so that the iron mineral in roasted product
It is higher with the abundant monomer dissociation of aluminium mineral, the rate of recovery of iron mineral；Aluminium mineral is distributed in magnetic tailing, subsequently can be to the magnetic separation
Mine tailing is handled to be enriched with aluminium therein, and the recycling that work is other valuable metals that sorts of iron before creates bar
Part.
The rate of recovery of method iron of the present invention from recovering iron from red mud is 80~95%, the magnetic concentrate obtained
Iron grade is 61~65%.
Compared with prior art, the features of the present invention and beneficial effect are：
(1) caused solid slag red mud in the substantial amounts of aluminum oxide production process in current China is directed to, the present invention is by pre-
Choosing first sub-elects the mineral of wherein relatively high magnetism ,-reduces-stage that reoxidizes then by pre-oxidation and makes wherein composition uneven
Iron mineral uniform conversion is the γ-Fe of relatively high magnetism2O3, a kind of good method for separating is provided for Iron concentrate in recovery red mud；
In suspension roaster, the iron mineral in material completes Fe2O3→Fe3O4→γ-Fe2O3、FeCO3→Fe2O3→Fe3O4→γ-
Fe2O3And Fe2O3·2H2O→Fe2O3→Fe3O4→γ-Fe2O3Conversion process, iron mineral reaction is uniform, and magnetic is remarkably reinforced；
(2) all processes are using reacting furnace as capital equipment, by the control of different oxidations, reducing atmosphere and temperature,
Corresponding physicochemical change is brought it about, realizes the phase transformation of iron mineral, finally gives the product γ-Fe of uniform quality2O3,
And being recycled for waste heat is realized in the process；The high efficiente callback that the red mud is realized eventually through ore grinding-magnetic separation utilizes.
On the one hand this method realizes effective sorting of a large amount of red muds unserviceable so far, vitalize a large amount of red mud secondary resources；The opposing party
Face can greatly improve the rate of recovery of iron in red mud recovery, reach energy-conservation, consumption reduction, synergy purpose；
(3) the pre- magnetic concentrate pre-oxidation technology of red mud is proposed：Compared with other magnetizing roast technologies, pass through pre-oxidation
Stage ensures that all iron minerals in material are completely reformed into Fe2O3, the reduction homogeneity of final product is ensure that, so to place
The ore adaptability of reason is stronger；
(4) iron ore accumulation of heat autoreduction technology is proposed, only ore is heated in preoxidation process, when ore enters reduction furnace
During chamber, reaction is completed using the heat and reducing gas of ore itself deposit, makes heating and Reduced separating, avoids reducing gas
The possibility of blast, securely and reliably, technology prototype is provided for industrialization equipment；
(5) the heterogeneous continuous suspended state control technology of ore particles in roaster is proposed：Material in whole roasting process
Particle is suspended in gas phase in the presence of the gas more particle, in preferable dispersity, gas-solid can be made fully to contact, and is made anti-
Should conduct heat, mass transfer effect it is preferable, roasting process reaction speed is fast, and uniform in quality is stable；
(6) magnetizing roast product Fe is proposed3O4Reoxidize synchronous recovery waste heat technology：By setting cooler environment, control roasting
Burn Fe in product3O4To γ-Fe2O3Convert again, reclaim the heat discharged during the thing inversion of phases.
(7) Iron concentrate has not only been reclaimed using-three sections of suspension roastings of preenrichment-magnetic selection method processing red mud, also caused red
Other metals (especially aluminium) in mud are enriched with, and condition is created for the recycling of other valuable metals.
Brief description of the drawings
Fig. 1 is that pre-oxidation-accumulation of heat reduces-reoxidizes phase flow schematic diagram in the method for embodiments of the invention 1；Figure
In, A is the preoxidized roast stage, and B is is passed through nitrogen displacement air event, and for C to be passed through the reducibility gas stage, D is to be passed through nitrogen
Gas is replaced the reducibility gas stage, and E is temperature-fall period, and F is to reoxidize the stage,
Reference is as follows：1- air；2-N2；3-CO；4- cooling waters (enter)；5- cooling waters (go out)；6- waste gas；7- liquefies
Gas；8- gas-permeable nets；9- burnings station；
Fig. 2 is-three sections of suspension roastings of preenrichment-magnetic separation process flow schematic diagram of the red mud of the embodiment of the present invention 1.
Embodiment
Following non-limiting examples can make one of ordinary skill in the art be more fully understood the present invention, but not with
Any mode limits the present invention.
Test method described in following embodiments, it is conventional method unless otherwise specified；The reagent and material, such as
Without specified otherwise, commercially obtain.
The suspension roaster used in the embodiment of the present invention is batch (-type) suspension roaster, including body of heater and its side wall is cold
But water leg, bottom of furnace body are provided with nitrogen inlet, air intake and reducibility gas entrance, gas-permeable nets are provided with below furnace interior
(air distribution plate) is used for placing response material and is uniformly distributed the gas of circulation, and waste gas outlet, body of heater lower section are provided with the top of body of heater
Sidepiece is provided with liquefied gas burner, and liquefied gas burner is located above gas-permeable nets.
Φ 180mm × 200mm tube ball mill ore grindings are used in following embodiments.
Magnetic separation is carried out in following embodiments using Φ 50mm magnetic separation tubes to sort.
The red mud used in following embodiments is Shandong red mud for alumina plant, and Iron grade TFe is 34.43%, by weight
Percentage contains FeO 0.66%, SiO23.23%, Al2O313.39%.
The condition of the high intensity magnetic separation of step 1 is 478kA/m in following embodiments.
Material after being reoxidized in following embodiments is detected with Mossbauer spectrometer, and the main component for measuring material is
Maghemite γ-Fe2O3With magnetic iron ore Fe3O4；Wherein γ-Fe2O3Weight content 50%, magnetic iron ore Fe3O4Weight content
45%；Remaining is bloodstone Fe2O3；The Mossbauer spectrometer model WSSL-10 of use.
The air intake of step 2 is 0.8m/s by flow velocity of the air in suspension roaster in following embodiments.
In following embodiments, the flow of reducibility gas and nitrogen presses two kinds of gases in suspension roaster in step 3
Flow velocity is 1.2m/s.
In following embodiments, reducibility gas is carbon monoxide in step 3.
Air intake in following embodiments in step 4 is 0.8m/s by flow velocity of the air in suspension roaster.
In following embodiments by suspension roaster material heating be passed through into suspension roaster liquefied gas and light into
Row heating.
Embodiment 1
The red mud raw ore Iron grade 34.43% of use, main component is (unit wt%) as shown in table 1 after high intensity magnetic separation；
Table 1
| Component | TFe | FeO | SiO2 | Al2O3 | CaO |
| Content | 44.32 | 0.66 | 3.23 | 13.39 | 0.93 |
| Component | MgO | P | S | K | Na |
| Content | 0.19 | 0.10 | 0.106 | 0.063 | 1.119 |
Pre- magnetic concentrate chemical phase analysis result is as shown in table 2；
Table 2
Method is carried out according to the following steps：
1st, pre- magnetic separation：Red mud ore grinding to granularity -0.074mm part are accounted for the 40% of gross weight, then carry out high intensity magnetic separation,
Magnetic field intensity is 478kA/m, obtains high intensity magnetic separation concentrate and high intensity magnetic separation mine tailing；High intensity magnetic separation concentrate be containing bloodstone, siderite and
The mixed material of limonite；
2nd, pre-oxidize：High intensity magnetic separation concentrate is put into suspension roaster, air is passed through into suspension roaster, makes the material be in
Suspended state；Material in suspension roaster is heated to 800 DEG C of progress preoxidized roasts, is now oxic gas in suspension roaster
Atmosphere, the time of pre-oxidation is 10s；
3rd, accumulation of heat reduces：Stop heating after the completion of insulation, being passed through nitrogen displacement into suspension roaster goes out air；Then to
CO is passed through in suspension roaster, material is in suspension loose condition (of surface), the heat saved using material itself is reduced, and is reduced
Time is 5 seconds；Continue to be passed through nitrogen while being passed through CO, the volume flow ratio of CO and nitrogen is 1:4；
4th, reoxidize：Reduction terminate after stop be passed through CO, be passed through into suspension roaster nitrogen displacement go out it is unreacted residual
Remaining CO, suspension roaster is cooled by the cooling water of suspension roaster chuck, when temperature is down to 400 DEG C, to suspension roasting
Air is passed through in stove to be reoxidized, and when the material in suspension roaster is cooled to below 100 DEG C, material is taken out and carries out two
Secondary ore grinding；Main component is Armco magnetic iron γ-Fe in material after reoxidizing2O3And Fe3O4；Wherein γ-Fe2O3Weight content exist
50%, Fe3O4Weight content 45%, remaining is bloodstone Fe2O3；Reoxidize reaction and release a large amount of reaction heat, roasted with suspending
The cooling water for burning stove chuck carries out heat exchange, is converted into vapor recovery；
5th, magnetic separation again：When the material after secondary grinding to granularity -0.025mm part account for the 80% of gross weight, by two
Material after secondary ore grinding carries out second of magnetic separation under the conditions of magnetic field intensity 60kA/m, obtains secondary magnetic concentrate and secondary magnetic separation
Mine tailing；
During in the above method, pre-oxidizing, reduce and reoxidizing, circulation has cooling all the time in the chuck of suspension roaster
Water；
The rate of recovery of above method iron is 95.41%；The Iron grade of secondary magnetic concentrate is 62.14%.
Embodiment 2
The Iron grade TFe 32.47% of red mud, by weight percentage containing Al2O314.63%, SiO210.53%；
With embodiment 1, difference is method：
(1) red mud ore grinding to granularity -0.074mm part are accounted for the 50% of gross weight；
(2) material in suspension roaster is heated to 700 DEG C of progress preoxidized roasts, the time of pre-oxidation is 30s；
(3) recovery time is 15 seconds；The volume flow ratio of CO and nitrogen is 1:5；
(4) when temperature is down to 350 DEG C, into suspension roaster being passed through air is reoxidized；Material after reoxidizing
Middle main component is Armco magnetic iron γ-Fe2O3And Fe3O4；Wherein γ-Fe2O3Weight content in 60%, Fe3O4Weight content exist
33%, remaining is bloodstone Fe2O3；
(5) when the material after secondary grinding to granularity -0.023mm part account for the 60% of gross weight, by secondary grinding
Material afterwards carries out second of magnetic separation under the conditions of magnetic field intensity 70kA/m, and the rate of recovery of iron is 90.45%；The iron of magnetic concentrate
Grade is 61.75%.
Claims (8)
- A kind of 1. method from recovering iron from red mud, it is characterised in that：Methods described includes：In suspension roaster, the red mud material through magnetic separation is subjected to pre-oxidation treatment in air atmosphere, made in red mud material Siderite and limonite be completely converted into bloodstone；Using the heat saved through pre-oxidation treatment resulting material itself, also Reduction treatment is carried out to it in originality gas atmosphere, it is Fe to make the bloodstone Restore All in material3O4；, will in air atmosphere Resulting material carries out re-oxidation processing, makes at least part Fe in material3O4It is converted into γ-Fe2O3；Magnetic separation processing is carried out to resulting material after above-mentioned steps processing.
- 2. according to the method for claim 1, it is characterised in that：The pre-oxidation treatment is：In suspension roaster, in sky Material is heated to 450~800 DEG C in gas atmosphere, is incubated 10~120s, makes siderite and limonite whole in red mud material It is converted into bloodstone.
- 3. according to the method for claim 2, it is characterised in that：Stop heating after the completion of insulation, make in suspension roaster Gas atmosphere is reducibility gas atmosphere, and 5~60s of reduction treatment, it is Fe to make the bloodstone Restore All in material3O4。
- 4. according to the method for claim 3, it is characterised in that：The re-oxidation is handled：Material is down to 250~ At 400 DEG C, suspension roaster is in air atmosphere, make at least part Fe in material3O4It is converted into γ-Fe2O3；Continue to drop Temperature takes out material to less than 100 DEG C.
- 5. according to the method for claim 1, it is characterised in that：Methods described includes following processing steps：(1) pre- magnetic separation：Red mud ore grinding to granularity -0.074mm part are accounted for the 40~80% of gross weight, then carry out strong magnetic Choosing, high intensity magnetic separation magnetic field intensity is 318~637kA/m, obtains high intensity magnetic separation concentrate and high intensity magnetic separation mine tailing；(2) pre-oxidize：High intensity magnetic separation concentrate is put into suspension roaster, air is passed through into suspension roaster, makes material in outstanding Floating state；Material in suspension roaster is heated to 450~800 DEG C of progress preoxidized roasts, is now oxygen in suspension roaster Change atmosphere, the time of pre-oxidation is 10~120s；(3) accumulation of heat reduces：Stop heating after the completion of insulation, being passed through nitrogen displacement into suspension roaster goes out air；Then to outstanding Reducibility gas is passed through in floating roaster, material is in suspension loose condition (of surface), the heat saved using material itself is gone back Original, recovery time are 5~60 seconds；(4) reoxidize：Reduction stops being passed through reducibility gas after terminating, and nitrogen displacement is passed through into suspension roaster and goes out unreacted Residual reducing gas, suspension roaster is cooled by the cooling water of suspension roaster chuck, when temperature is down to 250~ At 400 DEG C, into suspension roaster being passed through air is reoxidized, when the material in suspension roaster is cooled to less than 100 DEG C When, material is taken out and carries out secondary grinding；(5) magnetic separation again：When the material after secondary grinding to granularity -0.023mm part account for the 40~80% of gross weight, by two Material after secondary ore grinding carries out second of magnetic separation under the conditions of 60~100kA/m of magnetic field intensity, obtains secondary magnetic concentrate and two Secondary magnetic tailing.
- 6. according to the method for claim 5, it is characterised in that：While being passed through reducibility gas in the step (3) after Continue and be passed through nitrogen, the flow-rate ratio of reducibility gas and nitrogen is 1:1~10.
- 7. method according to claim 1 or 5, it is characterised in that：The reducibility gas is carbon monoxide.
- 8. according to the method for claim 5, it is characterised in that：Reaction heat is released in the reaction that reoxidizes in step (4), with hanging The cooling water of floating roaster chuck carries out heat exchange, is converted into vapor recovery.
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| CN109020134A (en) * | 2018-09-17 | 2018-12-18 | 四川农业大学 | A kind of method of two steps annealing method recycling Fenton sludge |
| CN110863114A (en) * | 2019-11-22 | 2020-03-06 | 东北大学 | Method for recovering iron by using high-iron red mud and method for extracting aluminum by using high-iron red mud |
| CN111068886A (en) * | 2019-12-26 | 2020-04-28 | 广西绿顺生物科技有限公司 | Method for producing high-purity reduced iron powder from red mud |
| WO2021237830A1 (en) * | 2020-05-29 | 2021-12-02 | 东北大学 | Suspension roasting system and method for industrialized processing of ferromanganese ore |
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| CN109020134A (en) * | 2018-09-17 | 2018-12-18 | 四川农业大学 | A kind of method of two steps annealing method recycling Fenton sludge |
| CN110863114A (en) * | 2019-11-22 | 2020-03-06 | 东北大学 | Method for recovering iron by using high-iron red mud and method for extracting aluminum by using high-iron red mud |
| CN111068886A (en) * | 2019-12-26 | 2020-04-28 | 广西绿顺生物科技有限公司 | Method for producing high-purity reduced iron powder from red mud |
| WO2021237830A1 (en) * | 2020-05-29 | 2021-12-02 | 东北大学 | Suspension roasting system and method for industrialized processing of ferromanganese ore |
| WO2022088396A1 (en) * | 2020-10-26 | 2022-05-05 | 中钢设备有限公司 | Method for extracting iron from high-phosphorus oolitic iron ore by suspension roasting and removing phosphorus by acid leaching |
| CN114225936A (en) * | 2021-12-14 | 2022-03-25 | 山东山科生态环境研究院有限公司 | Waste incineration flue gas denitration catalyst and preparation method thereof |
| CN114225936B (en) * | 2021-12-14 | 2024-02-27 | 山东山科生态环境研究院有限公司 | Waste incineration flue gas denitration catalyst and preparation method thereof |
| CN115784642A (en) * | 2022-11-30 | 2023-03-14 | 四川省星船城水泥股份有限公司 | Method for extracting iron from high-iron red mud and directly using cement raw material |
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