CN104988320B - The method and system of valuable metal is reclaimed from red mud - Google Patents

The method and system of valuable metal is reclaimed from red mud Download PDF

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CN104988320B
CN104988320B CN201510471593.4A CN201510471593A CN104988320B CN 104988320 B CN104988320 B CN 104988320B CN 201510471593 A CN201510471593 A CN 201510471593A CN 104988320 B CN104988320 B CN 104988320B
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mixed
red mud
iron
outlet
sodium
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CN201510471593.4A
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CN104988320A (en
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古明远
王敏
刘占华
王欣
曹志成
薛逊
吴道洪
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江苏省冶金设计院有限公司
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The invention discloses a kind of method and system that valuable metal is reclaimed from red mud, this method includes:(1) red mud, reducing agent and quick lime are subjected to mixed processing, to obtain mixed material;(2) mixed material is subjected to calcination process, to obtain sodium oxide molybdena and solid mixture containing sodium aluminate and iron;(3) solid mixture containing sodium aluminate and iron is subjected to Ultrafine Grinding processing, to obtain superfine powder;And the superfine powder is carried out separating treatment by (4), to obtain iron product, sodium aluminate solution and tailings.This method can realize the recycling of valuable metal iron, sodium and aluminium element in red mud, so as to widen the value of red mud.

Description

The method and system of valuable metal is reclaimed from red mud
Technical field
The invention belongs to chemical field, specifically, the present invention relates to a kind of method that valuable metal is reclaimed from red mud And system.
Background technology
China is alumina producing big country, and red mud is that aluminium industry extracts the contaminative waste residue discharged during aluminum oxide, typically It is average often to produce 1 ton of aluminum oxide, incidentally produce 1.0~2.0 tons of red muds.Because carrying under one's arms alkali lye in red mud, belong to highly basic pollutant, It is a kind of quite serious strong basicity pollution sources that alumina producer is caused.Prevent the fundamental solution that red mud pollutes from realizing the comprehensive of red mud Close and utilize, but so far, the quantity of the red mud rationally utilized in worldwide is a seldom part, so that The problem of some local red muds are caused than more serious environmental pollution.About 70,000,000 tons of the red mud that the whole world is produced every year, I The red mud that state produces every year is more than 30,000,000 tons.Red mud, which adds up volume of cargo in storage, increases to 3.5 hundred million tons, according to statistics, red mud Comprehensive utilization ratio is only 4%, less than the utilization rate of other metallurgical slags such as blast furnace slag, slag even copper ashes.
Due to red mud have aqueous high, retentiveness it is strong, containing alkali is high and the features such as smaller particle diameter, up to the present, both at home and abroad A preferable processing mode is not found still.Therefore red mud generally use is built trivial mode and stored up, and directly brings and fills out extra large or logical Cross and fill out sea after neutralisation treatment again.Can not rationally and effectively a large amount of utilize and must be using in the case of storing up processing, it is necessary to Prevent alkali lye contained in the red mud that alumina producer gives off from contact for a long time with ground and cause into underground or surface water body, Cause serious water pollution.It is considered as the most possible utilization for realizing extensive red mud of dissolving always that red mud, which is applied to building materials, Direction.But it is too high to be primarily limited to alkali content, prior art dealkalize cost is high, single progress alkali collection is economically unreasonable, The added value of product produced after dealkalize is low, and adding does not have enough supports in policy, therefore, never realizes technology for many years Property break through, and the dealkalize technology of only red mud makes a breakthrough, and red mud comprehensive utilization ratio is possible to rise appreciably.
The content of the invention
It is contemplated that at least solving one of technical problem in correlation technique to a certain extent.Therefore, the present invention One purpose is a kind of method and system that valuable metal is reclaimed from red mud of proposition, and this method can be realized valuable in red mud The recycling of metallic iron, sodium and aluminium element, so as to widen the value of red mud.
In one aspect of the invention, the present invention proposes a kind of method that valuable metal is reclaimed from red mud.According to this The embodiment of invention, this method includes:
(1) red mud, reducing agent and quick lime are subjected to mixed processing, to obtain mixed material;
(2) mixed material is subjected to calcination process, to obtain sodium oxide molybdena and solid containing sodium aluminate and iron Mixture;
(3) solid mixture containing sodium aluminate and iron is subjected to Ultrafine Grinding processing, to obtain superfine powder;And
(4) superfine powder is subjected to separating treatment, to obtain iron product, sodium aluminate solution and tailings.
Thus, the method that valuable metal is reclaimed from red mud according to embodiments of the present invention can realize valuable gold in red mud Belong to the recycling of iron, sodium and aluminium element, so as to widen the value of red mud.
In addition, the method according to the above embodiment of the present invention that valuable metal is reclaimed from red mud can also be with following attached Plus technical characteristic:
In some embodiments of the invention, in step (1), the red mud, the reducing agent and the quick lime are pressed It is 100 according to mass ratio:(10~25):(5~35) are mixed.Thus, it is possible to significantly improve the iron of follow-up calcination process process Reduction effect.
In some embodiments of the invention, in step (2), the temperature of the calcination process is Celsius for 1000~1200 Degree.Thus, the preliminary recovery of sodium in red mud can be not only realized, and make it that most sodium salt is converted into solubility in red mud Sodium aluminate, so as to improve the separating effect of subsequent metal iron and sodium aluminate.
In some embodiments of the invention, in step (3), particle diameter is not higher than 0.056 millimeter in the superfine powder Account for more than the 70wt% of total superfine powder.Thus, it is possible to further improve the separating effect of metallic iron and sodium aluminate in subsequent process.
In some embodiments of the invention, the method that valuable metal is reclaimed from red mud further comprises:(5) exist Before mixed material progress calcination process, forming processes are carried out to the mixed material in advance, to obtain mixing ball Group.Thus, it is possible to significantly improve the reduction effect of material during calcination process.
In another aspect of the present invention, the present invention proposes a kind of system that valuable metal is reclaimed from red mud, according to Embodiments of the invention, the system includes:
There is mixing arrangement, the mixing arrangement red mud entrance, reducing agent entrance, quick lime entrance and mixed material to go out Mouthful, and suitable for red mud, reducing agent and quick lime are carried out into mixed processing, to obtain mixed material;
Calciner, the calciner has mixed material entrance, sodium oxide molybdena outlet and solid mixture outlet, described Mixed material entrance is connected with mixed material outlet, and suitable for the mixed material is carried out into calcination process, to obtain Sodium oxide molybdena and the solid mixture containing sodium aluminate and iron;
Ultra-fine mill apparatus, the ultra-fine mill apparatus has solids mixture inlet and superfine powder outlet, the solid mixing Thing entrance is connected with solid mixture outlet, and ultra-fine suitable for the solid mixture containing sodium aluminate and iron is carried out Mill processing, to obtain superfine powder;And
There is separator, the separator superfine powder entrance, iron product outlet, sodium aluminate solution outlet and tailings to go out Mouthful, the superfine powder entrance is connected with superfine powder outlet, and suitable for the superfine powder is carried out into separating treatment, to obtain Iron product, sodium aluminate solution and tailings.
Thus, the system that valuable metal is reclaimed from red mud according to embodiments of the present invention can realize valuable gold in red mud Belong to the recycling of iron, sodium and aluminium element, so as to widen the value of red mud.
In addition, the system according to the above embodiment of the present invention that valuable metal is reclaimed from red mud can also be with following attached Plus technical characteristic:
In some embodiments of the invention, the system that valuable metal is reclaimed from red mud further comprises:Shaping Device, the shaped device has mixed material import and the outlet of mixing pelletizing, the mixed material import and the mixture Material outlet is connected, and the mixing pelletizing outlet is connected with the mixed material entrance, and suitable for being carried out by the mixed material Before calcination process, forming processes are carried out to the mixed material in advance, to obtain mixing pelletizing.Thus, it is possible to significantly carry The reduction effect of material during high calcination process.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from description of the accompanying drawings below to embodiment is combined Substantially and be readily appreciated that, wherein:
Fig. 1 is the method flow schematic diagram according to an embodiment of the invention that valuable metal is reclaimed from red mud;
Fig. 2 is the method flow schematic diagram that valuable metal is reclaimed from red mud according to further embodiment of the present invention;
Fig. 3 is the system structure diagram according to an embodiment of the invention that valuable metal is reclaimed from red mud;
Fig. 4 is the system structure diagram that valuable metal is reclaimed from red mud according to further embodiment of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", " under ", "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer ", " up time The orientation or position relationship of the instruction such as pin ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on orientation shown in the drawings or Position relationship, is for only for ease of the description present invention and simplifies description, rather than indicate or imply that the device or element of meaning must There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or Implicitly include at least one this feature.In the description of the invention, " multiple " are meant that at least two, such as two, three It is individual etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc. Term should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally;Can be that machinery connects Connect or electrically connect;Can be joined directly together, can also be indirectly connected to by intermediary, can be in two elements The connection in portion or the interaction relationship of two elements, unless otherwise clear and definite restriction.For one of ordinary skill in the art For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature can be with "above" or "below" second feature It is that the first and second features are directly contacted, or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In one aspect of the invention, the present invention proposes a kind of method that valuable metal is reclaimed from red mud.According to this The embodiment of invention, this method includes:(1) red mud, reducing agent and quick lime are subjected to mixed processing, to obtain mixture Material;(2) by the mixed material carry out calcination process, so as to obtain sodium oxide molybdena and containing sodium aluminate and iron solid mixing Thing;(3) solid mixture containing sodium aluminate and iron is subjected to Ultrafine Grinding processing, to obtain superfine powder;And (4) will The superfine powder carries out separating treatment, to obtain iron product, sodium aluminate solution and tailings.Inventor has found, by by red mud Mixed with reducing agent and quick lime, can using the calcium oxide in quick lime as roasting process cosolvent, so as to significantly reduce Temperature during calcination process, promotes the reduction of iron oxide and sodium oxide molybdena, wherein, the metallic sodium restored is volatized into roasting The fume recovery system of device is oxidized to sodium oxide molybdena, realizes the preliminary recovery of sodium in red mud, and passes through calcination process, can be with So that the most nepheline material containing sodium is converted into the sodium aluminate of solubility in red mud, in addition will roasting gained solid mixture Ultrafine Grinding processing is carried out, being completely separated for metallic iron and aluminum-containing mineral can be caused, be can be achieved so as to be handled through later separation Sodium aluminate and metallic iron are efficiently separated, and compared with prior art, the present invention can realize valuable metal sodium, iron and aluminium in red mud The high efficiente callback of element, so as to widen the value of red mud, realization turns harm into good, and turns waste into wealth, so as to fundamentally solve Certainly this trade waste utilization rate of red mud is low and the problem stored up for a long time.
The method that valuable metal is reclaimed from red mud of the embodiment of the present invention is described in detail below with reference to Fig. 1-2. Embodiments in accordance with the present invention, this method includes:
S100:Red mud, reducing agent and quick lime are subjected to mixed processing
Embodiments in accordance with the present invention, carry out mixed processing, so as to be mixed by red mud, reducing agent and quick lime Material.Inventor has found, by the way that red mud is mixed with reducing agent and quick lime, can regard the calcium oxide in quick lime as roasting The cosolvent of process, so that the temperature during significantly reducing calcination process, promotes the reduction of iron oxide and sodium oxide molybdena, Jin Erxian Write the rate of recovery for improving metallic iron and sodium.
According to one embodiment of present invention, the mixed proportion of red mud, reducing agent and quick lime is not particularly restricted, this Art personnel can be selected according to actual needs, according to a particular embodiment of the invention, red mud, reducing agent and raw stone Ash can be 100 according to mass ratio:(10~25):(5~35) are mixed.Inventor's discovery, the selection gist root of reducing agent Selected according to the iron for needing to be reduced in red mud, reducing agent amount of allocating is too low, do not reach the basic demand of reducing iron oxides, Reduction resultant metal rate is relatively low, influences follow-up metal iron product to be separated with tailings, reducing agent amount of allocating is too high, influences metal The aggregation of iron product, is equally also unfavorable for sorting, and add cost;The amount of allocating of quick lime:Promotion iron is met simultaneously Reduction, carries out reaction generation sodium aluminate and calcium silicates with sodium aluminosilicate in red mud in addition.
According to still a further embodiment, the particular type of reducing agent is not particularly restricted, people in the art Member can be selected according to actual needs, according to a particular embodiment of the invention, and reducing agent can be carbon containing reducer, for example For fine coal.Thus, it is possible to significantly reduce cost of material.
S200:Mixed material is subjected to calcination process
Embodiments in accordance with the present invention, calcination process is carried out by mixed material, so as to obtain sodium oxide molybdena and contain The solid mixture of sodium aluminate and iron.Inventor's discovery, can be by the iron oxide and sodium oxide molybdena in red mud also by calcination process Originally it was metallic iron and metallic sodium, wherein, the fume recovery system that the metallic sodium being reduced out is volatized into calciner is oxidized For sodium oxide molybdena, the preliminary recovery of sodium in red mud is realized, and pass through calcination process, can cause most containing sodium in red mud Nepheline material is converted into the sodium aluminate of solubility, so as to handle efficient point that sodium aluminate and metallic iron can be achieved through later separation From.
Embodiments in accordance with the present invention, the temperature of calcination process is not particularly restricted, and those skilled in the art can root Selected according to being actually needed, according to a particular embodiment of the invention, the temperature of calcination process can be Celsius for 1000~1200 Degree.Inventor has found, when being reacted below 1000~1200 DEG C, and sodium aluminosilicate reacts in the CaO and red mud in quick lime, A large amount of generation β-Ca2SiO4With sodium aluminate NaAlO2, therefore roasted product can remove aluminic acid through being washed during physical separation Sodium.
S300:Solid mixture containing sodium aluminate and iron is subjected to Ultrafine Grinding processing
Embodiments in accordance with the present invention, Ultrafine Grinding processing is carried out by the solid mixture containing sodium aluminate and iron, so as to To obtain superfine powder.Inventor is had found, roasting gained solid mixture is carried out into Ultrafine Grinding processing, metallic iron can be caused with containing Aluminium mineral is completely separated, and efficiently separating for sodium aluminate and metallic iron can be achieved so as to be handled through later separation.
Embodiments in accordance with the present invention, the particle diameter of superfine powder is not particularly restricted, and those skilled in the art can basis It is actually needed and is selected, according to a particular embodiment of the invention, to be not higher than 0.056 millimeter account for total ultra-fine for particle diameter in superfine powder More than the 70wt% of powder.Inventor has found, due to (1000~1200 DEG C controlled of the invention), gold under relatively low reduction temperature Belong to iron particle tiny, do not assemble, it is therefore desirable to which the solid mixture containing sodium aluminate and iron is subjected to Ultrafine Grinding, the aluminic acid made Sodium is sufficiently dissociated with iron, reduces the mutual entrainment of metal iron product and tailings during magnetic separation, improves the removal efficiency of alkali, Particle is excessive, is unfavorable for the separation of metallic iron and the tailings containing sodium.
S400:Superfine powder is subjected to separating treatment
Embodiments in accordance with the present invention, carry out separating treatment, so as to obtain iron product, aluminium by above-mentioned gained superfine powder Acid sodium solution and tailings.In the step, specifically, to gained superfine powder carry out wet magnetic separation, you can realize magnetic iron product with The nonmagnetic mine tailing solution containing sodium aluminate and tailings is efficiently separated, finally again through filtering can realize sodium aluminate solution with The separation of tailings.
The method that valuable metal is reclaimed from red mud according to embodiments of the present invention is by by red mud and reducing agent and giving birth to stone Ash mixing, can using the calcium oxide in quick lime as roasting process cosolvent so that during significantly reducing calcination process Temperature, promote the reduction of iron oxide and sodium oxide molybdena, wherein, the metallic sodium restored is volatized into the off-gas recovery of calciner System is oxidized to sodium oxide molybdena, realizes the preliminary recovery of sodium in red mud, and passes through calcination process, can cause big portion in red mud The nepheline material containing sodium divided is converted into the sodium aluminate of solubility, in addition will be obtained by roasting at solid mixture progress Ultrafine Grinding Reason, can cause being completely separated for metallic iron and aluminum-containing mineral, and sodium aluminate and metal can be achieved so as to be handled through later separation Efficiently separating for iron, it is compared with prior art, of the invention to realize efficiently returning for valuable metal sodium in red mud, iron and aluminium element Receive, so as to widen the value of red mud, realization turns harm into good, and turns waste into wealth, so as to fundamentally solve this work of red mud Industry waste utilization rate is low and the problem stored up for a long time.
With reference to Fig. 2, the method that valuable metal is reclaimed from red mud according to embodiments of the present invention further comprises:
S500:Before mixed material is carried out into calcination process, forming processes are carried out to mixed material in advance
Embodiments in accordance with the present invention, before mixed material is carried out into calcination process, are carried out into mixed material in advance Type processing, so as to obtain mixing pelletizing.Thus, it is possible to significantly improve iron oxide and sodium oxide molybdena during calcination process also Former effect.
In another aspect of the present invention, the present invention proposes a kind of system that valuable metal is reclaimed from red mud.According to Embodiments of the invention, the system includes:Mixing arrangement, the mixing arrangement has red mud entrance, reducing agent entrance, quick lime Entrance and mixed material outlet, and suitable for red mud, reducing agent and quick lime are carried out into mixed processing, to obtain mixed material; Calciner, the calciner has mixed material entrance, sodium oxide molybdena outlet and solid mixture outlet, the mixed material The outlet of entrance and the mixed material is connected, and suitable for by mixed material progress calcination process, so as to obtain sodium oxide molybdena with And the solid mixture containing sodium aluminate and iron;Ultra-fine mill apparatus, the ultra-fine mill apparatus has solids mixture inlet and super Fine powder is exported, and the outlet of the solids mixture inlet and the solid mixture is connected, and suitable for described will contain sodium aluminate with The solid mixture of iron carries out Ultrafine Grinding processing, to obtain superfine powder;And separator, the separator has ultra-fine Powder entrance, iron product outlet, sodium aluminate solution outlet and tailings outlet, the superfine powder entrance export phase with the superfine powder Even, and suitable for the superfine powder is carried out into separating treatment, to obtain iron product, sodium aluminate solution and tailings.Inventor's discovery, By the way that red mud is mixed with reducing agent and quick lime, can using the calcium oxide in quick lime as roasting process cosolvent, from And the temperature during calcination process is significantly reduced, promote the reduction of iron oxide and sodium oxide molybdena, wherein, the metallic sodium restored is waved The fume recovery system that hair enters calciner is oxidized to sodium oxide molybdena, realizes the preliminary recovery of sodium in red mud, and by roasting Burning processing, can make it that the most nepheline material containing sodium is converted into soluble sodium aluminate in red mud, will be calcined institute in addition Solid mixture carries out Ultrafine Grinding processing, being completely separated for metallic iron and aluminum-containing mineral can be caused, so that through later separation Efficiently separating for sodium aluminate and metallic iron can be achieved in processing, and compared with prior art, the present invention can realize valuable in red mud The high efficiente callback of metallic sodium, iron and aluminium element, so as to widen the value of red mud, realization turns harm into good, and turns waste into wealth, from And fundamentally solve the problem that this trade waste utilization rate of red mud is low and stores up for a long time.
The system that valuable metal is reclaimed from red mud below with reference to Fig. 3-4 pairs of embodiment of the present invention is described in detail. Embodiments in accordance with the present invention, the system includes:
Mixing arrangement 100:Embodiments in accordance with the present invention, mixing arrangement 100 has red mud entrance 101, reducing agent entrance 102nd, quick lime entrance 103 and mixed material outlet 104, and suitable for red mud, reducing agent and quick lime are carried out into mixed processing, from And mixed material can be obtained.Inventor's discovery, can be by quick lime by the way that red mud is mixed with reducing agent and quick lime Calcium oxide so that the temperature during significantly reducing calcination process, promotes iron oxide and oxidation as the cosolvent of roasting process The reduction of sodium, and then significantly improve the rate of recovery of metallic iron and sodium.
According to one embodiment of present invention, the mixed proportion of red mud, reducing agent and quick lime is not particularly restricted, this Art personnel can be selected according to actual needs, according to a particular embodiment of the invention, red mud, reducing agent and raw stone Ash can be 100 according to mass ratio:(10~25):(5~35) are mixed.Inventor's discovery, the selection gist root of reducing agent Selected according to the iron for needing to be reduced in red mud, reducing agent amount of allocating is too low, do not reach the basic demand of reducing iron oxides, Reduction resultant metal rate is relatively low, influences follow-up metal iron product to be separated with tailings, reducing agent amount of allocating is too high, influences metal The aggregation of iron product, is equally also unfavorable for sorting, and add cost;The amount of allocating of quick lime:Promotion iron is met simultaneously Reduction, carries out reaction generation sodium aluminate and calcium silicates with sodium aluminosilicate in red mud in addition.
According to still a further embodiment, the particular type of reducing agent is not particularly restricted, people in the art Member can be selected according to actual needs, according to a particular embodiment of the invention, and reducing agent can be carbon containing reducer, for example For fine coal.Thus, it is possible to significantly reduce cost of material.
Calciner 200:Embodiments in accordance with the present invention, calciner 200 has mixed material entrance 201, sodium oxide molybdena Outlet 202 and solid mixture outlet 203, mixed material entrance 201 are connected with mixed material outlet 104, and are suitable to mixing Material carries out calcination process, so as to obtain sodium oxide molybdena and solid mixture containing sodium aluminate and iron.Inventor's discovery, By calcination process, the iron oxide and sodium oxide molybdena in red mud can be reduced to metallic iron and metallic sodium, wherein, it is reduced out The fume recovery system that metallic sodium is volatized into calciner is oxidized to sodium oxide molybdena, realizes the preliminary recovery of sodium in red mud, and And pass through calcination process, it can make it that the most nepheline material containing sodium is converted into soluble sodium aluminate in red mud, so that Handled through later separation and efficiently separating for sodium aluminate and metallic iron can be achieved.
Embodiments in accordance with the present invention, the temperature of calcination process is not particularly restricted, and those skilled in the art can root Selected according to being actually needed, according to a particular embodiment of the invention, the temperature of calcination process can be Celsius for 1000~1200 Degree.Inventor has found, when being reacted below 1000~1200 DEG C, and sodium aluminosilicate reacts in the CaO and red mud in quick lime, A large amount of generation β-Ca2SiO4With sodium aluminate NaAlO2, therefore roasted product can remove aluminic acid through being washed during physical separation Sodium.
Ultra-fine mill apparatus 300:Embodiments in accordance with the present invention, ultra-fine mill apparatus 300 has the He of solids mixture inlet 301 Superfine powder outlet 302, solids mixture inlet 301 is connected with solid mixture outlet 203, and suitable for sodium aluminate and iron will be contained Solid mixture carry out Ultrafine Grinding processing, so as to obtain superfine powder.Inventor has found, by roasting gained solid mixture Ultrafine Grinding processing is carried out, being completely separated for metallic iron and aluminum-containing mineral can be caused, be can be achieved so as to be handled through later separation Sodium aluminate and metallic iron are efficiently separated.
Embodiments in accordance with the present invention, the particle diameter of superfine powder is not particularly restricted, and those skilled in the art can basis It is actually needed and is selected, according to a particular embodiment of the invention, to be not higher than 0.056 millimeter account for total ultra-fine for particle diameter in superfine powder More than the 70wt% of powder.Inventor has found, due to (1000~1200 DEG C controlled of the invention), gold under relatively low reduction temperature Belong to iron particle tiny, do not assemble, it is therefore desirable to which the solid mixture containing sodium aluminate and iron is subjected to Ultrafine Grinding, the aluminic acid made Sodium is sufficiently dissociated with iron, reduces the mutual entrainment of metal iron product and tailings during magnetic separation, improves the removal efficiency of alkali, Particle is excessive, is unfavorable for the separation of metallic iron and the tailings containing sodium.
Separator 400:There is embodiments in accordance with the present invention, separator 400 superfine powder entrance 401, iron product to go out Mouth 402, sodium aluminate solution outlet 403 and tailings outlet 404, superfine powder entrance 401 is connected with superfine powder outlet 302, and is suitable to Above-mentioned gained superfine powder is subjected to separating treatment, so as to obtain iron product, sodium aluminate solution and tailings.In the step, tool Body, wet magnetic separation is carried out to gained superfine powder, you can realize magnetic iron product with nonmagnetic containing sodium aluminate and tailings Efficiently separating for mine tailing solution, finally can realize the separation of sodium aluminate solution and tailings through filtering again.
The system that valuable metal is reclaimed from red mud according to embodiments of the present invention is by by red mud and reducing agent and giving birth to stone Ash mixing, can using the calcium oxide in quick lime as roasting process cosolvent so that during significantly reducing calcination process Temperature, promote the reduction of iron oxide and sodium oxide molybdena, wherein, the metallic sodium restored is volatized into the off-gas recovery of calciner System is oxidized to sodium oxide molybdena, realizes the preliminary recovery of sodium in red mud, and passes through calcination process, can cause big portion in red mud The nepheline material containing sodium divided is converted into the sodium aluminate of solubility, in addition will be obtained by roasting at solid mixture progress Ultrafine Grinding Reason, can cause being completely separated for metallic iron and aluminum-containing mineral, and sodium aluminate and metal can be achieved so as to be handled through later separation Efficiently separating for iron, it is compared with prior art, of the invention to realize efficiently returning for valuable metal sodium in red mud, iron and aluminium element Receive, so as to widen the value of red mud, realization turns harm into good, and turns waste into wealth, so as to fundamentally solve this work of red mud Industry waste utilization rate is low and the problem stored up for a long time.
With reference to Fig. 4, the system that valuable metal is reclaimed from red mud according to embodiments of the present invention further comprises:
Shaped device 500:Embodiments in accordance with the present invention, shaped device 500 has mixed material import 501 and mixing ball Group outlet 502, mixed material import 501 is connected with mixed material outlet 104, mixing pelletizing outlet 502 and mixed material entrance 201 are connected, and suitable for before mixed material is carried out into calcination process, carrying out forming processes to mixed material in advance, so as to To obtain mixing pelletizing.Thus, it is possible to significantly improve the reduction effect of iron oxide and sodium oxide molybdena during calcination process.
Below with reference to specific embodiment, present invention is described, it is necessary to which explanation, these embodiments are only description Property, without limiting the present invention in any way.
Embodiment 1
Red mud, reduction coal and quick lime are subjected to mix, wherein, red mud, reduction coal and Lime Quality ratio are 100:20:20, gained mix is then rolled into mixing, mixed material is obtained, forming processes then are carried out to mixed material, Obtain mixing pelletizing, mixing pelletizing be then subjected to calcination process at 1150 DEG C, obtain sodium oxide molybdena and containing sodium aluminate and The solid mixture of iron, then carries out Ultrafine Grinding processing by solid mixture of the gained containing sodium aluminate and iron, obtains superfine powder, Wherein, particle diameter is not higher than 0.056 millimeter of the 80wt% for accounting for total superfine powder in superfine powder, and gained superfine powder then is carried out into wet type Magnetic separation, obtains iron product (iron content is more than 87wt%), sodium aluminate solution and tailings, wherein, sodium oxide molybdena is in tailings 0.9wt%, TFe be less than 15wt%, calculated according to sodium oxide molybdena in red mud and dealkalize tailings, whole process dealkalize rate reach 85wt% with On, iron recovery reaches that aluminium recovery reaches more than 70wt% in more than 80wt%, sodium aluminate solution.
Embodiment 2
Red mud, reduction coal and quick lime are subjected to mix, wherein, red mud, reduction coal and Lime Quality ratio are 100:20:25, gained mix is then rolled into mixing, mixed material is obtained, forming processes then are carried out to mixed material, Obtain mixing pelletizing, mixing pelletizing be then subjected to calcination process at 1200 DEG C, obtain sodium oxide molybdena and containing sodium aluminate and The solid mixture of iron, then carries out Ultrafine Grinding processing by solid mixture of the gained containing sodium aluminate and iron, obtains superfine powder, Wherein, particle diameter is not higher than 0.056 millimeter of the 85wt% for accounting for total superfine powder in superfine powder, and gained superfine powder then is carried out into wet type Magnetic separation, obtains iron product (iron content is more than 90wt%), sodium aluminate solution and tailings, wherein, sodium oxide molybdena is less than in tailings 0.7wt%, TFe be less than 13wt%, calculated according to sodium oxide molybdena in red mud and dealkalize tailings, whole process dealkalize rate reach 90wt% with On, iron recovery reaches that aluminium recovery reaches more than 75wt% in more than 85wt%, sodium aluminate solution.
Embodiment 3
Red mud, reduction coal and quick lime are subjected to mix, wherein, red mud, reduction coal and Lime Quality ratio are 100:25:30, gained mix is then rolled into mixing, mixed material is obtained, then entered mixed material at 1200 DEG C Row calcination process, obtains sodium oxide molybdena and the solid mixture containing sodium aluminate and iron, gained then is contained into sodium aluminate and iron Solid mixture carry out Ultrafine Grinding processing, obtain superfine powder, wherein, to be not higher than 0.056 millimeter account for total for particle diameter in superfine powder The 90wt% of superfine powder, then carries out wet magnetic separation by gained superfine powder, obtains iron product (iron content is more than 90wt%), aluminic acid Sodium solution and tailings, wherein, sodium oxide molybdena is less than 0.55wt% in tailings, and TFe is less than 13wt%, according in red mud and dealkalize tailings Sodium oxide molybdena is calculated, and whole process dealkalize rate reaches more than 92wt%, and iron recovery reaches that aluminium is returned in more than 85wt%, sodium aluminate solution Yield reaches more than 75wt%.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means to combine specific features, structure, material or the spy that the embodiment or example are described Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not Identical embodiment or example must be directed to.Moreover, specific features, structure, material or the feature of description can be with office Combined in an appropriate manner in one or more embodiments or example.In addition, in the case of not conflicting, the skill of this area Art personnel can be tied the not be the same as Example or the feature of example and non-be the same as Example or example described in this specification Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned Embodiment is changed, changed, replacing and modification.

Claims (6)

1. a kind of method that valuable metal is reclaimed from red mud, it is characterised in that including:
(1) red mud, reducing agent and quick lime are subjected to mixed processing, to obtain mixed material;
(2) by the mixed material carry out calcination process, so as to obtain sodium oxide molybdena and containing sodium aluminate and iron solid mixing Thing;
(3) solid mixture containing sodium aluminate and iron is subjected to Ultrafine Grinding processing, to obtain superfine powder;And
(4) superfine powder is subjected to separating treatment, to obtain iron product, sodium aluminate solution and tailings,
Wherein, in step (2), the temperature of the calcination process is 1000~1200 degrees Celsius.
2. according to the method described in claim 1, it is characterised in that in step (1), the red mud, the reducing agent and institute It is 100 that quick lime, which is stated, according to mass ratio:(10~25):(5~35) are mixed.
3. according to the method described in claim 1, it is characterised in that in step (3), particle diameter is not higher than in the superfine powder 0.056 millimeter of more than the 70wt% for accounting for total superfine powder.
4. according to the method described in claim 1, it is characterised in that further comprise:
(5) before the mixed material is carried out into calcination process, forming processes are carried out to the mixed material in advance, so as to To mixing pelletizing.
5. a kind of system that valuable metal is reclaimed from red mud, it is characterised in that including:
Mixing arrangement, the mixing arrangement has red mud entrance, reducing agent entrance, quick lime entrance and mixed material outlet, and Suitable for red mud, reducing agent and quick lime are carried out into mixed processing, to obtain mixed material;
Calciner, the calciner has mixed material entrance, sodium oxide molybdena outlet and solid mixture outlet, the mixing Material inlet is connected with mixed material outlet, and suitable for the mixed material is carried out into calcination process, to be aoxidized Sodium and the solid mixture containing sodium aluminate and iron;
Ultra-fine mill apparatus, the ultra-fine mill apparatus has solids mixture inlet and superfine powder outlet, and the solid mixture enters Mouth is connected with solid mixture outlet, and suitable for the solid mixture containing sodium aluminate and iron is carried out at Ultrafine Grinding Reason, to obtain superfine powder;And
Separator, the separator has superfine powder entrance, iron product outlet, sodium aluminate solution outlet and tailings outlet, The superfine powder entrance is connected with superfine powder outlet, and suitable for the superfine powder is carried out into separating treatment, to obtain iron Product, sodium aluminate solution and tailings,
Wherein, the temperature of the calcination process is 1000~1200 degrees Celsius.
6. system according to claim 5, it is characterised in that further comprise:
Shaped device, the shaped device has mixed material import and the outlet of mixing pelletizing, the mixed material import and institute State mixed material outlet to be connected, the mixing pelletizing outlet is connected with the mixed material entrance, and is suitable to by the mixing Material is carried out before calcination process, carries out forming processes to the mixed material in advance, to obtain mixing pelletizing.
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CN105671303A (en) * 2016-03-25 2016-06-15 江苏省冶金设计院有限公司 Comprehensive treatment system and method for red mud and carbide slags
CN105969975B (en) * 2016-05-05 2018-08-10 江苏省冶金设计院有限公司 The method that iron and aluminium are detached from high-iron bauxite stone
CN106119533A (en) * 2016-08-01 2016-11-16 江苏省冶金设计院有限公司 The preparation method of red mud carbonaceous pelletizing and preparation system
CN106119455A (en) * 2016-08-01 2016-11-16 江苏省冶金设计院有限公司 Process the method and system of red mud
CN106244754A (en) * 2016-08-01 2016-12-21 江苏省冶金设计院有限公司 Process the method and system of red mud
CN106222347A (en) * 2016-08-01 2016-12-14 江苏省冶金设计院有限公司 From the method and system of recovering iron from red mud
CN106698916A (en) * 2016-12-19 2017-05-24 江苏省冶金设计院有限公司 Method for preparing mineral fiber through red mud slag
CN107083485B (en) * 2017-04-28 2018-09-07 东北大学 A kind of method of comprehensive utilization of alumina laterite
CN107022677A (en) * 2017-05-27 2017-08-08 江苏省冶金设计院有限公司 The method and system of iron and aluminum oxide is extracted in a kind of tailings from magnetic separation
CN107083467A (en) * 2017-05-27 2017-08-22 江苏省冶金设计院有限公司 A kind of method and system that iron and aluminum oxide are extracted from red mud

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