CN111320213A - Comprehensive treatment method and system for red mud resource utilization - Google Patents
Comprehensive treatment method and system for red mud resource utilization Download PDFInfo
- Publication number
- CN111320213A CN111320213A CN202010097058.8A CN202010097058A CN111320213A CN 111320213 A CN111320213 A CN 111320213A CN 202010097058 A CN202010097058 A CN 202010097058A CN 111320213 A CN111320213 A CN 111320213A
- Authority
- CN
- China
- Prior art keywords
- red mud
- gas
- reaction
- heating
- coal gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000011282 treatment Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 26
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000007885 magnetic separation Methods 0.000 claims abstract description 28
- 239000004568 cement Substances 0.000 claims abstract description 23
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 15
- 150000002739 metals Chemical class 0.000 claims abstract description 15
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 112
- 239000007789 gas Substances 0.000 claims description 106
- 239000003034 coal gas Substances 0.000 claims description 61
- 238000010438 heat treatment Methods 0.000 claims description 52
- 238000001035 drying Methods 0.000 claims description 26
- 239000000843 powder Substances 0.000 claims description 26
- 230000018044 dehydration Effects 0.000 claims description 17
- 238000006297 dehydration reaction Methods 0.000 claims description 17
- 239000004744 fabric Substances 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 14
- 239000000428 dust Substances 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 9
- 239000001257 hydrogen Substances 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims 3
- 239000013064 chemical raw material Substances 0.000 claims 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 238000007781 pre-processing Methods 0.000 claims 1
- 239000002440 industrial waste Substances 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 15
- 239000001301 oxygen Substances 0.000 description 15
- 229910052760 oxygen Inorganic materials 0.000 description 15
- 238000006722 reduction reaction Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 6
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000003513 alkali Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000009835 boiling Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000001590 oxidative effect Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000005587 bubbling Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004449 solid propellant Substances 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000004131 Bayer process Methods 0.000 description 1
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 1
- 206010035148 Plague Diseases 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- QGZKDVFQNNGYKY-NJFSPNSNSA-N nitrogen-16 Chemical compound [16NH3] QGZKDVFQNNGYKY-NJFSPNSNSA-N 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/08—Ferroso-ferric oxide [Fe3O4]
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a comprehensive treatment method and a comprehensive treatment system for red mud resource utilization, and belongs to the technical field of industrial waste residue resource utilization. According to the invention, the dried and heated red mud is directly contacted and reacted with the reducing gas fully, the ferric oxide in the red mud is reduced into the ferroferric oxide, the ferroferric oxide is recovered by magnetic separation, the residual dry red mud can be directly processed to prepare cement or used for further separation of other metals, the process flow is simple and convenient, and the method has good practical application value, especially large-scale industrial and industrialized application value.
Description
Technical Field
The invention belongs to the technical field of industrial waste residue resource utilization, and particularly relates to a comprehensive treatment method and a comprehensive treatment system for red mud resource utilization.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The red mud is the extremely fine particle strongly alkaline solid waste generated in the process of producing alumina by taking bauxite as a raw material, is red due to the fact that the red mud contains a large amount of ferric oxide, and is called the red mud, and the output quantity of the red mud is different according to ore grade, production method and technical level. The red mud pollution treatment method has the advantages that 0.8-1.5 t of red mud is produced when 1t of alumina is produced in most production plants, the annual production amount of the red mud is continuously increased along with the gradual increase of the alumina yield and the gradual reduction of the bauxite grade, the accumulated red mud not only occupies a large amount of land, the alkaline substances in the red mud also pollute the environment, and the domestic water and crops of surrounding residents are also influenced, particularly in 2010, after the accident of dam break pollution of Hungary red mud occurs, the red mud problem is attracted to the world. Therefore, the stacking management difficulty and the environmental risk of the red mud become larger and larger, and meanwhile, the stacking of the red mud can cost a large amount of conveying cost, yard construction and maintenance cost, thereby seriously influencing and restricting the ecological environment.
The treatment and comprehensive utilization of the red mud are one of the difficulties which puzzles the alumina production of various countries in the world. Researchers have made many relevant researches, mainly to extract valuable metals from the raw materials and to produce building materials and filtering agents by using red mud. However, the inventor finds that the existing treatment process has the characteristics of high treatment cost, high energy consumption, complex flow, low industrial applicability, unsatisfactory effect and the like. Therefore, many research results on the utilization of the red mud are resulted, and the industrial popularization cannot be realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a comprehensive treatment method and a comprehensive treatment system for red mud resource utilization, the dried and heated red mud is directly contacted and reacted with reducing gas fully, ferric oxide in the red mud is reduced into ferroferric oxide, the ferroferric oxide is recovered by magnetic separation, the residual dry red mud can be directly processed to prepare cement or further sort other metals (such as aluminum and the like), the process flow is simple and convenient, and the method and the system have good practical application value, in particular to large-scale industrialization and industrial application value.
In order to achieve the purpose, the invention relates to the following technical scheme:
the invention provides a comprehensive treatment method for resource utilization of red mud, which at least comprises the step of carrying out heating contact reaction on the pretreated red mud and reducing gas.
Wherein, the pretreatment method comprises the following steps: dehydrating and drying the red mud, and crushing to prepare red mud dry powder, wherein the specific heating temperature of the dehydration and drying is 100-200 ℃;
the reducing gas includes, but is not limited to, H2CO, gas, etc., preferably ordinary gas in view of cost saving, etc., since the gas itself contains H2And CO, a relatively good reducing gas, and relatively pure H2And CO is cheaper. Meanwhile, in the reaction process, the alkaline substances contained in the red mud and the acidic gas in the coal gas are subjected to neutralization reaction, so that the content of the acidic gas (such as hydrogen sulfide and the like) in the coal gas can be reduced, and the effects of desulfurization and deacidification of the coal gas are achieved.
In one embodiment of the present invention, the coal gas is a gas produced by performing processes such as dry distillation, vaporization or cracking on solid fuel such as coal and coke or liquid fuel such as heavy oil. The coal gas comprises the following components in percentage by weight: 0-40% of hydrogen, 1-50% of CO, and the balance of nitrogen or carbon dioxide gas, and in addition, the unavoidable H2S, and the like. In the present invention, it is preferable to use a coal gas or a hot coal gas which has not been subjected to removal of an acid gas (such as hydrogen sulfide or the like).
Wherein the reducing gas needs to be subjected to heating treatment before reaction so as to form high-temperature reducing gas, and the heating temperature of the heating device can be controlled to be 350-675 ℃; the high-temperature reducing gas is preferably high-temperature coal gas.
In order to ensure that the reaction is fully carried out, the heating contact reaction can be specifically realized by introducing high-temperature reducing gas into a closed device, and the gas flow drives the red mud dry powder to be uniformly dispersed or realizing the separation between the red mud dry powder particles by the rotation of the device and other modes, so that the red mud particles are more fully contacted with the reducing gas, and the ferric oxide in the red mud is reduced, namely the ferric oxide is reduced into the ferroferric oxide, thereby facilitating the subsequent magnetic separation.
Preferably, the particle size of the red mud powder particles is controlled to be not more than 300 microns, and the particle size of the red mud powder particles is small, so that the red mud powder particles can be fully mixed with gas at the later stage, and the reaction is promoted to be carried out; preferably, the particle size of the red mud particles is controlled to be not more than 300 microns, and the red mud particles with the particle size of less than 74 microns account for 80% of the total amount, and the introducing amount of the reducing gas is related to the working mode of the closed device, the red mud particles, the heating temperature, the heating time and the like.
The specific conditions of the heating contact reaction are as follows: the heating temperature can be 350-675 ℃, and the ferric oxide in the red mud is reacted to the ferroferric oxide by controlling the reaction temperature and the reaction time, so that the subsequent reduction reaction (such as further reduction to ferrous oxide or simple substance iron) is reduced as much as possible, and the subsequent magnetic separation is facilitated.
The invention proves that 1 ton of red mud is treated under the reaction conditions, and the iron content (Fe) of the red mud dry powder is different2O335-70%), gas (pure CO + H) is consumed2) The content is 17-34 cubic meters.
The closed device can be a rotary kiln (preferably an external heating rotary kiln) or a fluidized bed (or a fluidized bed or a bubbling bed), preferably a fluidized bed, and coal gas is introduced into the fluidized bed to ensure that the boiling gas flow and the carried red mud suspended particles are in full contact reaction, so that the reaction process is accelerated, the reaction efficiency is improved, and the reaction process in the device is relatively consistent.
In a specific embodiment of the present invention, a comprehensive treatment method for red mud resource utilization is provided, which comprises: the red mud after dehydration, drying and crushing is heated and fully contacted with coal gas for reaction, ferric oxide in the red mud is reduced into ferroferric oxide, the ferroferric oxide in the red mud dry powder is separated by magnetic separation, the residual dry red mud can be directly processed into cement (or other metals are further selected), and the residual coal gas can be continuously recycled or used as chemical raw materials through further purification, such as methanol production, synthesis gas production or heat supply, and the like.
Generally speaking, because the red mud has high alkali content and is limited by the alkali content index of cement, low-alkali cement is difficult to produce, but the dealkalization cost of the conventional red mud is too high at present, so that the cost for producing the cement by using the dealkalized red mud is greatly increased, the grade of the cement is lower, and the occupation rate of the cement market is greatly reduced.
The invention provides a comprehensive treatment system for red mud resource utilization, which at least comprises a reaction device, wherein the reaction device is a closed device and is used for heating and contacting the pretreated red mud and reducing gas for reaction.
The reaction apparatus may be a rotary kiln (preferably an externally heated rotary kiln) or a fluidized bed (or ebullating or bubbling bed).
Preferably, the reaction device is provided with an object viewing window, so that an operator can observe the reaction condition in the reaction device conveniently.
The comprehensive treatment system also comprises a red mud pretreatment device and a red mud feeding device, wherein the red mud pretreatment device comprises a dehydration drying device and a crushing device which are sequentially connected; wherein, the dehydration drying device can be a heating drying rotary kiln.
The red mud feeding device is a vacuum replacement feeding device, the red mud which is dehydrated, dried and crushed is fed into the vacuum replacement feeding device and then is input into the reaction device through a pipeline, and external oxygen and other gases are prevented from entering the reaction device, so that the reaction cannot be normally carried out or explosion is caused.
The reaction device is also connected with a discharging vacuum replacement device, so that the red mud containing the ferroferric oxide after the reaction is finished is released from the device and cooled to normal temperature, thereby not only preventing external oxygen from entering the reaction device, but also avoiding the ferroferric oxide still in a high-temperature state from contacting oxygen and oxidizing the oxygen into the ferric oxide.
The discharging vacuum replacement device is connected with the magnetic separation system, red mud containing ferroferric oxide is conveyed to the magnetic separation system for magnetic separation of the ferroferric oxide, and the residual red mud dry powder can be used for cement raw materials or further separating other metals.
The reaction device is also connected with a gas heater, and the gas heater is used for heating gas (the gas can be gas without removing acid gas or hot gas), and then conveying the gas into the reaction device for reaction.
The reaction device is also connected with a dust remover, the dust remover is connected with a self-deashing cooler, the self-deashing cooler is connected with a cloth bag filter, the cloth bag filter can be used for obtaining cleaner coal gas after the residual coal gas after the reaction is cooled, filtered and the like, and meanwhile, the dust remover, the self-deashing cooler and the cloth bag filter can be connected with a discharging vacuum displacement device, so that the red mud powder and the like carried out in the coal gas are all output, and the cloth bag filter is more economic and environment-friendly.
The beneficial technical effects of one or more technical schemes are as follows:
the method and the system for comprehensively treating the red mud resource utilization are provided for the first time, the dried and heated red mud is directly in full contact with reducing gas and reacts, ferric oxide in the red mud is reduced into ferroferric oxide, the ferroferric oxide is recovered by magnetic separation, the residual dry red mud can be directly processed to prepare cement or other metals such as aluminum and the like can be further separated from the residual dry red mud, and the additional value of products is improved.
In a word, the technical method and the equipment provided by the technical scheme are simple, the investment is low, the operation cost is low, the income is high, and a foundation is laid for realizing the harmless comprehensive utilization of the red mud.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a reaction scheme of example 1 of the present invention; wherein, 1-cloth bag filter I, 2-coal gas cooler, 3-vacuum replacement device, 4-heating drying rotary kiln, 5-cloth bag filter II, 6-external heating rotary kiln, 7-discharging vacuum device, 8-magnetic separation system.
FIG. 2 is a reaction scheme of example 2 of the present invention.
FIG. 3 shows the red mud material and the ferroferric oxide obtained by reduction reaction in the pilot plant test of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. It is to be understood that the scope of the invention is not to be limited to the specific embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention.
As mentioned above, the treatment and comprehensive utilization of red mud are one of the difficulties which plague the production of alumina in various countries in the world. Researchers have made many relevant researches, mainly to extract valuable metals from the raw materials and to produce building materials and filtering agents by using red mud. However, the existing treatment process has the characteristics of high treatment cost, high energy consumption, complex flow, weak industrial applicability, unsatisfactory effect and the like. Therefore, many research results on the utilization of the red mud are resulted, and the industrial popularization cannot be realized.
In view of the above, in a typical embodiment of the present invention, an integrated treatment method for resource utilization of red mud is provided, which at least comprises a heating contact reaction of the pretreated red mud and a reducing gas.
In another embodiment of the present invention, the pretreatment method comprises: dehydrating and drying the red mud, and crushing to prepare red mud dry powder, wherein the specific heating temperature of the dehydration and drying is 100-200 ℃;
in yet another embodiment of the present invention, the reducing gas includes, but is not limited to, H2CO, gas, etc., preferably ordinary gas in view of cost saving, etc., since the gas itself contains H2And CO, which is a better reducing gas and is cheaper than pure hydrogen and CO. Meanwhile, in the reaction process, the alkaline substances contained in the red mud and the acidic gas in the coal gas are subjected to neutralization reaction, so that the content of the acidic gas (such as hydrogen sulfide and the like) in the coal gas can be reduced, and the effects of desulfurization and deacidification of the coal gas are achieved.
In one embodiment of the present invention, the coal gas is a gas produced by performing processes such as dry distillation, vaporization or cracking on solid fuel such as coal and coke or liquid fuel such as heavy oil. The coal gas comprises the following components in percentage by weight: 0-40% of hydrogen, 1-50% of CO, and the balance of nitrogen or carbon dioxide gas, and in addition, the unavoidable H2S, and the like. In general, in the actual production process, the produced gas is also required to be subjected to acid gas removal so as to reduce the influence of acid gas on pipeline corrosion and actual production, and in the present invention, it is preferable to use gas (or hot gas) without being desulfurized to remove acid gas (such as containing hydrogen sulfide and the like).
In yet another embodiment of the present invention, the reducing gas is required to be heated before the reaction to form a high temperature reducing gas, and the heating temperature of the heating device can be controlled to 350-.
In order to ensure that the reaction is fully carried out, the heating contact reaction can be specifically carried out by introducing high-temperature reducing gas into a closed device, and the gas flow drives the red mud dry powder to be uniformly dispersed, so that the iron sesquioxide in the red mud is fully reduced, namely, the iron sesquioxide is reduced into ferroferric oxide, and the magnetic separation is convenient.
In another embodiment of the invention, the particle size of the red mud particles is controlled to be not more than 300 microns, and the particle size of the red mud particles is small, so that the red mud particles can be fully mixed with gas at a later stage, and the reaction is promoted; preferably, the particle size of the red mud particles is controlled to be not more than 300 microns, and the red mud particles with the particle size of less than 74 microns account for 80% of the total amount, and the introducing amount of the reducing gas is related to the working mode of the closed device, the red mud particles, the heating temperature, the heating time and the like.
In another embodiment of the present invention, the specific conditions for the heating contact reaction are as follows: the heating temperature can be 350-675 ℃, and the ferric oxide in the red mud is reacted to the ferroferric oxide by controlling the reaction temperature and the reaction time, so that the subsequent further reduction reaction (such as further reduction to ferrous oxide or simple substance iron) is reduced as much as possible, and the subsequent magnetic separation is facilitated; in the prior art, the method has the defects that,
in another embodiment of the present invention, under the above reaction conditions, 1 ton of red mud is treated, and coal gas (pure CO + H) is consumed2) The content is 17-34 cubic meters.
In another embodiment of the present invention, the closed device may be a rotary kiln (preferably, an external heating rotary kiln) or a fluidized bed, preferably, a fluidized bed, and the fluidized bed is filled with gas to make the boiling gas flow fully contact and react with the carried red mud suspended particles, so as to accelerate the reaction process, improve the reaction efficiency, and ensure the reaction process in the device to be relatively consistent. In addition, the gas-based reduction of Fe in red mud2O3Can realize Fe2O3→Fe3O4→ FeO → Fe, but the amount of gas consumed is large, the reduction temperature is also relatively high, the cost is high, and the low-cost operation of iron works cannot be realized, so the invention aims to separate iron-containing oxides by controlling the conditions, and achieves the most economical operation mode which mainly aims at treating red mud.
In a specific embodiment of the present invention, a comprehensive treatment method for red mud resource utilization is provided, which comprises: the red mud after dehydration, drying and crushing and coal gas are heated for full contact reaction, ferric oxide in the red mud is reduced into ferroferric oxide, the ferroferric oxide in the dry red mud powder is separated by magnetic separation, the residual dry red mud can be directly processed into cement or further separated from metals such as aluminum and the like, the added value of products is improved, and the residual coal gas can be continuously recycled or used as chemical raw materials by further purification, such as methanol production, synthesis gas production, heat supply and the like.
Generally speaking, because the red mud has high alkali content and is limited by the alkali content index of cement, low-alkali cement is difficult to produce, but the dealkalization cost of the conventional red mud is too high at present, so that the cost for producing the cement by using the dealkalized red mud is greatly increased, the grade of the cement is lower, and the occupation rate of the cement market is greatly reduced.
In another embodiment of the present invention, a comprehensive treatment system for red mud resource utilization is provided, which at least includes a reaction device, wherein the reaction device is a closed device, and is configured to perform a heating contact reaction between the pretreated red mud and a reducing gas.
In still another embodiment of the present invention, the reaction apparatus may be a rotary kiln (preferably an external heat type rotary kiln) or a fluidized bed (or an ebullating bed or a bubbling bed), and more preferably a fluidized bed.
In another embodiment of the present invention, the reaction device is provided with an object viewing window, so that an operator can observe the reaction condition in the reaction device conveniently.
In another embodiment of the present invention, the comprehensive treatment system may further include a red mud pretreatment device and a red mud feeding device, wherein the red mud pretreatment device includes a dehydration drying device and a crushing device which are connected in sequence; wherein, the dehydration drying device can be a heating drying rotary kiln.
In another embodiment of the present invention, the red mud feeding device is a vacuum displacement feeding device, and the red mud after dehydration, drying and crushing is fed into the vacuum displacement feeding device (such as a vacuum feeding machine), and then is fed into the reaction device through a pipeline, so as to prevent external oxygen and other gases from entering the reaction device, thereby preventing the reaction from being abnormally performed or causing explosion.
In another embodiment of the present invention, the reaction apparatus is further connected to a vacuum displacement apparatus for discharging, so that the red mud containing ferroferric oxide after the reaction is finished is released from the apparatus, and is cooled to normal temperature, thereby preventing external oxygen from entering the reaction apparatus, and simultaneously preventing the ferroferric oxide still in a high temperature state from contacting oxygen and oxidizing into iron sesquioxide.
In another specific embodiment of the invention, the discharging vacuum displacement device is connected with a magnetic separation system, red mud containing ferroferric oxide is conveyed to the magnetic separation system for magnetic separation of the ferroferric oxide, and the residual red mud dry powder can be used for cement raw materials or further separation of other metals such as aluminum and the like, so that the added value of products is improved.
In another embodiment of the invention, a gas heater is further connected to the reaction device, and the gas heater is used for heating gas (the gas can be gas without being desulfurized and removing acid gas or hot gas), and then conveying the gas into the reaction device for reaction.
In another embodiment of the present invention, the reaction device is further connected to a dust collector, the dust collector is connected to a self-deashing temperature reducer, the self-deashing temperature reducer is connected to a cloth bag filter, and the cloth bag filter can be used for obtaining cleaner coal gas after the residual coal gas after the reaction is subjected to cooling, filtering and other treatments, and meanwhile, the dust collector, the self-deashing temperature reducer and the cloth bag filter can be connected to a discharging vacuum displacement device, so that red mud and other components carried out in the coal gas can be output, and the method is more economical and environment-friendly.
The invention is further illustrated by the following examples, butAnd are not to be construed as limiting the invention. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. In the invention, the red mud is produced by Bayer process alumina production process materials. Red mud component: SiO 22：10％，CaO 5％，Al2O315％，Fe2O345％，Na2O5% and others.
Example 1
The comprehensive treatment system for red mud resource utilization comprises an external heating type rotary kiln, and a viewing window is arranged on a reaction device, so that an operator can observe the reaction condition in the reaction device conveniently. The comprehensive treatment system also comprises a red mud pretreatment device and a red mud feeding device, wherein the red mud pretreatment device comprises a dehydration drying device and a crushing device which are sequentially connected; wherein, the dehydration drying device is a heating drying rotary kiln. The red mud feeding device is a vacuum replacement feeding device, red mud which is dehydrated, dried and crushed (the particle size of the red mud is controlled to be less than 300 micrometers, and the particle size of the red mud accounts for 80% of the particle size of the red mud is controlled to be less than 74 micrometers) is fed into the vacuum replacement feeding device and then is input into the reaction device through a pipeline, so that the phenomenon that external oxygen and other gases enter the reaction device to cause abnormal reaction or explosion is avoided.
The reaction device is also connected with a discharging vacuum replacement device, so that the red mud containing the ferroferric oxide after the reaction is finished is released from the reaction device and cooled to normal temperature, thereby not only preventing external oxygen from entering the reaction device, but also avoiding the ferroferric oxide still in a high-temperature state from contacting oxygen and oxidizing the oxygen into the ferric oxide. The discharging vacuum replacement device is connected with the magnetic separation system, red mud containing ferroferric oxide is conveyed to the magnetic separation system for magnetic separation of the ferroferric oxide, and the residual red mud dry powder can be used for cement raw materials or further separating other metals. The reaction device is also connected with a coal gas heater, and the coal gas heater is used for heating coal gas (the coal gas is coal gas without removing acid gas or hot coal gas), and then conveying the coal gas into the reaction device for reaction. The reaction device is also connected with a coal gas cooler, the coal gas cooler is connected with a cloth bag filter, the coal gas cooler can be used for obtaining cleaner coal gas after the rest coal gas after the reaction is subjected to treatment such as cooling and filtering, and meanwhile, the coal gas cooler and the cloth bag filter can be connected with a discharging vacuum displacement device, so that components such as red mud brought out from the coal gas are output, and the coal gas cooler is more economic and environment-friendly.
When the external-heating type rotary kiln is operated, heated high-temperature coal gas (400-500 ℃) is conveyed to the external-heating type rotary kiln, meanwhile, red mud dry powder is added into the external-heating type rotary kiln for heating contact reaction, the temperature of the external-heating type rotary kiln is controlled to be 350-675 ℃, and heat supply of the external-heating type rotary kiln can be obtained by burning coal powder, natural gas or coal gas and the like. After the reaction is finished, ferroferric oxide in the red mud is separated by a magnetic separation system, and the residual red mud can be used as a cement raw material or directly separated from other metals such as aluminum and the like.
And (3) estimating economic benefit: (annual treatment red mud 100 million tons)
The Fe content is calculated by processing 125t of red mud per hour2O355 percent, 73 tons of recyclable fine iron powder, 285 yuan minimum price and 20805 ten thousand yuan value.
The gas consumption and reduction amount is 125 × 55 yuan 6875 yuan, the fuel consumption 125 × 14 yuan 1750 yuan, the power consumption 125 × 12 yuan 1500 yuan, the personnel wage 125 × 17 yuan 2125 yuan, the financial expense 125 × 35 yuan 4375 yuan, the other 125 × 10 yuan 1250 yuan 17875 yuan,
profit 20805-. Annual benefit 2343 ten thousand yuan
The generated environmental benefit is more considerable.
Example 2
A comprehensive treatment system for red mud resource utilization comprises a reaction device, namely a high-temperature coal gas fluidized bed. The reaction device is provided with an object viewing window, so that an operator can observe the reaction condition in the reaction device conveniently. The comprehensive treatment system also comprises a red mud pretreatment device and a red mud feeding device, wherein the red mud pretreatment device comprises a dehydration drying device and a crushing device which are sequentially connected; wherein, the dehydration drying device can be a heating drying rotary kiln. The red mud feeding device is a vacuum replacement feeding device, the dehydrated, dried and crushed red mud (the particle size of the red mud is controlled to be less than 300 micrometers, and the particle size of the red mud accounts for 80% below 74 micrometers) is fed into the vacuum replacement feeding device and then is input into the reaction device through a pipeline, so that the phenomenon that external oxygen and other gases enter the reaction device, and the reaction cannot be normally carried out or explosion is caused is avoided.
The reaction device is also connected with a discharging vacuum replacement device, so that the red mud containing the ferroferric oxide after the reaction is finished is released from the device and cooled to normal temperature, thereby not only preventing external oxygen from entering the reaction device, but also avoiding the ferroferric oxide still in a high-temperature state from contacting oxygen and oxidizing the oxygen into the ferric oxide. The discharging vacuum replacement device is connected with the magnetic separation system, red mud containing ferroferric oxide is conveyed to the magnetic separation system for magnetic separation of the ferroferric oxide, and the residual red mud dry powder can be used for cement raw materials or further separating other metals. The reaction device is also connected with a coal gas heater, and the coal gas heater is used for heating coal gas (the coal gas is coal gas without removing acid gas or hot coal gas), and then conveying the coal gas into the reaction device for reaction. The reaction device is also connected with a high-temperature cyclone dust collector, the high-temperature cyclone dust collector is connected with a self-deashing cooler, the self-deashing cooler is connected with a cloth bag filter and can be used for obtaining cleaner coal gas after the residual coal gas after the reaction is subjected to cooling, filtering and the like, and meanwhile, the high-temperature cyclone dust collector, the self-deashing cooler and the cloth bag filter can be connected with a discharging vacuum displacement device, so that components such as red mud brought out of the coal gas are output, and the high-temperature cyclone dust collector, the self-deashing cooler and the cloth bag filter are more economical and environment-friendly.
When the fluidized bed runs, heated high-temperature coal gas (650 ℃) is conveyed into the fluidized bed, meanwhile, the red mud dry powder is added into an external heating type rotary kiln for heating contact reaction, the temperature of the fluidized bed is controlled to be 350-675 ℃, and the heat supply of the fluidized bed can be obtained by burning coal powder, natural gas or coal gas and the like. After the reaction is finished, ferroferric oxide in the red mud is separated by a magnetic separation system, and the residual red mud can be directly used as a cement raw material or further separated from other metals such as aluminum and the like.
Actual bench test
Equipment: a set of electric heaters (30kw) comprising an electric heater, a controller, various flowmeters, thermometers, current and voltage measuring instruments and cables;
two reactors;
air supply: standard nitrogen 16 bottles (Industrial grade)
Standard hydrogen 2 bottle (analytical grade)
Standard CO gas 3 bottle (analytical grade)
Red mud: 300kg of red mud from two companies
Continuous test for 17 days
Gas-based reduction of Fe in red mud2O3Can realize → Fe3O4→ FeO → Fe, but the amount of gas consumed is large, the reduction temperature is also relatively high, the cost is high, and the low-cost operation of iron works cannot be realized, so the reduction is the most economical operation mode which aims at separating iron-containing oxides and treating red mud.
The first group of gas mixture ratio: 98-50% of nitrogen, 1-25% of hydrogen and 1-25% of carbon monoxide;
the second group of gas mixture ratio: 100-50% of nitrogen and 0-50% of carbon monoxide gas;
the third group of gas mixture ratio: 100-60% of nitrogen and 0-40% of hydrogen.
The experiment is divided into an experiment group and a control group, wherein the control group comprises A, B, C three groups (the first group, the second group and the third group of gases are respectively used for carrying out the experiment), solid red mud is uniformly distributed in the first reactor and is still, 300g of dry-basis red mud uniformly penetrates through the gas, the gas temperature is controlled to be 400-650 ℃, and the experiment shows that 80% of magnetization can be realized within 9-16 minutes.
The experimental group comprises D, E, F three groups (respectively using a first group of gas, a second group of gas and a third group of gas for experiment), solid red mud is crushed into powder, and the dry-basis red mud is 300g, the three groups of gases are respectively tested, the red mud fine powder is in a boiling fluidization state under the drive of the gases, the gas temperature is 400-.
Tests prove that the red mud powder is in boiling contact with gas, the contact specific surface area is very large, the second-level reduction state can be realized, and the industrial production is completely met.
It should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the examples given, those skilled in the art can modify the technical solution of the present invention as needed or equivalent substitutions without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. The comprehensive treatment method for resource utilization of the red mud is characterized by at least comprising the step of heating and contacting the pretreated red mud with reducing gas for reaction.
2. The integrated processing method according to claim 1, wherein the preprocessing method comprises: dehydrating and drying the red mud, and crushing to prepare red mud dry powder, wherein the specific heating temperature of the dehydration and drying is 100-200 ℃;
the reducing gas comprises hydrogen, CO and coal gas, and is preferably common coal gas.
3. The integrated processing method as claimed in claim 1, wherein the reducing gas is subjected to a heating treatment before the reaction to form a high-temperature reducing gas, and the heating temperature of the heating device is controlled to be 600-700 ℃; the high-temperature reducing gas is preferably high-temperature coal gas.
4. The integrated processing method according to claim 1, wherein the specific conditions of the heating contact reaction are as follows: the heating temperature is 350-675 ℃.
5. A comprehensive treatment method for red mud resource utilization comprises the following steps: the red mud after dehydration, drying and crushing is heated and fully contacted with coal gas for reaction, ferric oxide in the red mud is reduced into ferroferric oxide, the ferroferric oxide in the red mud dry powder is separated by magnetic separation, the residual dry red mud is directly processed into cement or is further separated from other metals, and the residual coal gas is continuously recycled or is further purified to be used as a chemical raw material.
6. The comprehensive treatment system for red mud resource utilization is characterized by at least comprising a reaction device, wherein the reaction device is a closed device and is used for heating, contacting and reacting the pretreated red mud and reducing gas.
7. An integrated processing system according to claim 6, wherein the reaction means is a rotary kiln (preferably an externally heated rotary kiln) or a fluidized bed.
8. An integrated processing system according to claim 6, wherein the reaction device is provided with an object viewing window.
9. The integrated treatment system according to claim 6, further comprising a red mud pretreatment device and a red mud feeding device, wherein the red mud pretreatment device comprises a dehydration drying device and a crushing device which are connected in sequence; wherein the dehydration drying device is a heating drying rotary kiln;
the red mud feeding device is a vacuum displacement feeding device;
the reaction device is also connected with a discharging vacuum replacement device.
10. The comprehensive treatment system of claim 6, wherein the discharge vacuum displacement device is connected with a magnetic separation system, red mud containing ferroferric oxide is conveyed to the magnetic separation system for magnetic separation of the ferroferric oxide, and the remaining red mud dry powder is used as a cement raw material or for further separation of other metals;
the reaction device is also connected with a gas heater, and the gas heater is used for heating gas (the gas is the gas without removing acid gas), and then conveying the gas into the reaction device for reaction;
the reaction device is also connected with a dust remover, the dust remover is connected with a self-deashing cooler, and the self-deashing cooler is connected with a cloth bag filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010097058.8A CN111320213A (en) | 2020-02-17 | 2020-02-17 | Comprehensive treatment method and system for red mud resource utilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010097058.8A CN111320213A (en) | 2020-02-17 | 2020-02-17 | Comprehensive treatment method and system for red mud resource utilization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111320213A true CN111320213A (en) | 2020-06-23 |
Family
ID=71163427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010097058.8A Pending CN111320213A (en) | 2020-02-17 | 2020-02-17 | Comprehensive treatment method and system for red mud resource utilization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111320213A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112430742A (en) * | 2020-10-16 | 2021-03-02 | 彭思尧 | Low-cost aluminum oxide red mud resource utilization process method and application thereof |
| CN114940914A (en) * | 2022-05-30 | 2022-08-26 | 山东大学 | System and process for biomass pyrolysis and red mud reduction |
| CN115957760A (en) * | 2022-07-12 | 2023-04-14 | 重庆理工大学 | Method for preparing catalyst for water treatment from modified red mud and application thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012100004A1 (en) * | 2011-01-18 | 2012-07-26 | Mohsen Amiran | Methods for recovering magnetite bauxite residue |
| CN102628097A (en) * | 2012-04-28 | 2012-08-08 | 北京科技大学 | Method for preparing iron concentrate powder by reducing and magnetizing red mud in fluidized bed |
| CN102626670A (en) * | 2012-04-28 | 2012-08-08 | 北京科技大学 | Method for preparing high purity iron ore by reducing and magnetizing red mud in rotary kiln |
| 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 |
| CN109867462A (en) * | 2019-02-27 | 2019-06-11 | 彭思晓 | A kind of cement burning system and application method |
| CN110004263A (en) * | 2019-05-17 | 2019-07-12 | 中铝山东工程技术有限公司 | A kind of technique of red mud fluidized bed process production Iron concentrate |
-
2020
- 2020-02-17 CN CN202010097058.8A patent/CN111320213A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012100004A1 (en) * | 2011-01-18 | 2012-07-26 | Mohsen Amiran | Methods for recovering magnetite bauxite residue |
| CN102628097A (en) * | 2012-04-28 | 2012-08-08 | 北京科技大学 | Method for preparing iron concentrate powder by reducing and magnetizing red mud in fluidized bed |
| CN102626670A (en) * | 2012-04-28 | 2012-08-08 | 北京科技大学 | Method for preparing high purity iron ore by reducing and magnetizing red mud in rotary kiln |
| 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 |
| CN109867462A (en) * | 2019-02-27 | 2019-06-11 | 彭思晓 | A kind of cement burning system and application method |
| CN110004263A (en) * | 2019-05-17 | 2019-07-12 | 中铝山东工程技术有限公司 | A kind of technique of red mud fluidized bed process production Iron concentrate |
Non-Patent Citations (1)
| Title |
|---|
| 李纯毅: "《煤质分析》", 31 December 2012, 北京理工大学出版社, pages: 322 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112430742A (en) * | 2020-10-16 | 2021-03-02 | 彭思尧 | Low-cost aluminum oxide red mud resource utilization process method and application thereof |
| CN112430742B (en) * | 2020-10-16 | 2023-12-01 | 彭思尧 | Low-cost alumina red mud recycling process method and application thereof |
| CN114940914A (en) * | 2022-05-30 | 2022-08-26 | 山东大学 | System and process for biomass pyrolysis and red mud reduction |
| CN115957760A (en) * | 2022-07-12 | 2023-04-14 | 重庆理工大学 | Method for preparing catalyst for water treatment from modified red mud and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111320213A (en) | Comprehensive treatment method and system for red mud resource utilization | |
| CN101386921B (en) | Method for separating V-Ti-Fe fine powder | |
| CN104694760B (en) | It is a kind of to handle the method and system that red mud reclaims Iron concentrate | |
| WO2020024350A1 (en) | System and method for recovering sulfur during copper smelting process | |
| CN106823774B (en) | Device and method for fixing carbon dioxide and recovering sensible heat by using blast furnace slag | |
| CN108504855A (en) | A method of producing iron ore concentrate by reducing agent suspending magnetization roasting of siderite | |
| CN116004936B (en) | Treatment method of laterite nickel ore acid leaching slag | |
| CN103011090A (en) | Method for producing sulfur by using pyrolysis-reducing united technique | |
| CN112322909A (en) | Method for extracting valuable metal elements from laterite-nickel ore by sulfuric acid leaching method and acid-base regeneration circulation | |
| CN106540801A (en) | A kind of method that magnetizing roast magnetic separation is carried out to red mud | |
| CN101875486A (en) | Pollution-free production process for preparing acid from pyrite | |
| CN109576497A (en) | A kind of method that the closed cycle of zinc smelting factory waste residue utilizes | |
| CN110093471A (en) | A kind of efficient low-consume red mud method of comprehensive utilization | |
| Tang et al. | Fluidized bed roasting technology in iron ores dressing in china—a review on equipment development and application prospect | |
| CN110172538A (en) | A kind of red mud high-efficiency resource recycling system and technique | |
| Wu et al. | Co-recovery of manganese from pyrolusite and gold from carbonaceous gold ore using fluidized roasting coupling technology | |
| CN113201358A (en) | Method for producing combustible gas by reducing red mud by using organic solid waste pyrolysis gas | |
| CN112934478B (en) | Method for recovering iron ore concentrate in copper slag and copper floating tailings by microwave low-temperature reduction roasting | |
| CN100515929C (en) | Cinder processing method in acid preparing process from pyrite ore | |
| CN111118281B (en) | Method for separating titanium and iron from seaside placer based on suspension roasting | |
| CN103230792B (en) | Produce rubidium vanadium catalyst of sulphuric acid and preparation method thereof | |
| CN116751968A (en) | Suspension roasting-dry arsenic collection treatment system and process for carbon-containing arsenic-containing gold ore | |
| CN111020094A (en) | Method for recovering iron by utilizing coal gangue and method for extracting aluminum by utilizing coal gangue | |
| CN107354260A (en) | A kind of system and method that DRI is smelted using clean pyrolysis gas | |
| CN116694923A (en) | Device and process for treating siderite and hematite by adopting coal-based suspension roasting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |