CN114180588A - Method for preparing magnetic zeolite by using red mud in cooperation with carbon-containing aluminum-silicon waste - Google Patents
Method for preparing magnetic zeolite by using red mud in cooperation with carbon-containing aluminum-silicon waste Download PDFInfo
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- CN114180588A CN114180588A CN202111452439.4A CN202111452439A CN114180588A CN 114180588 A CN114180588 A CN 114180588A CN 202111452439 A CN202111452439 A CN 202111452439A CN 114180588 A CN114180588 A CN 114180588A
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- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000010457 zeolite Substances 0.000 title claims abstract description 49
- 229910021536 Zeolite Inorganic materials 0.000 title claims abstract description 48
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000002699 waste material Substances 0.000 title claims abstract description 29
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 230000032683 aging Effects 0.000 claims abstract description 15
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 14
- 239000011734 sodium Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005216 hydrothermal crystallization Methods 0.000 claims abstract description 9
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 230000001590 oxidative effect Effects 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 18
- 238000002425 crystallisation Methods 0.000 claims description 11
- 230000008025 crystallization Effects 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 238000000227 grinding Methods 0.000 claims description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 18
- 239000003245 coal Substances 0.000 abstract description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract description 8
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract description 4
- 239000002910 solid waste Substances 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 abstract description 3
- 239000002893 slag Substances 0.000 abstract description 3
- 239000000654 additive Substances 0.000 abstract description 2
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 229910001385 heavy metal Inorganic materials 0.000 abstract 1
- 239000005416 organic matter Substances 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 239000002351 wastewater Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 239000000047 product Substances 0.000 description 11
- 229910000323 aluminium silicate Inorganic materials 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- LIKBJVNGSGBSGK-UHFFFAOYSA-N iron(3+);oxygen(2-) Chemical group [O-2].[O-2].[O-2].[Fe+3].[Fe+3] LIKBJVNGSGBSGK-UHFFFAOYSA-N 0.000 description 3
- 239000006249 magnetic particle Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 229910052595 hematite Inorganic materials 0.000 description 2
- 239000011019 hematite Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical class [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- JYIBXUUINYLWLR-UHFFFAOYSA-N aluminum;calcium;potassium;silicon;sodium;trihydrate Chemical compound O.O.O.[Na].[Al].[Si].[K].[Ca] JYIBXUUINYLWLR-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000005341 cation exchange Methods 0.000 description 1
- 229910001603 clinoptilolite Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- NQXWGWZJXJUMQB-UHFFFAOYSA-K iron trichloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].Cl[Fe+]Cl NQXWGWZJXJUMQB-UHFFFAOYSA-K 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/26—Aluminium-containing silicates, i.e. silico-aluminates
- C01B33/28—Base exchange silicates, e.g. zeolites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention aims to provide a method for preparing magnetic zeolite by using red mud and carbon-containing aluminum-silicon waste, belonging to the technical field of solid waste resource utilization, and comprising the following process flows of: uniformly mixing red mud, carbon-containing aluminum silicon wastes (such as coal gangue, gasified slag and the like) and sodium additives (such as sodium hydroxide, sodium carbonate and the like) in proportion, and carrying out reduction roasting for 0.5-3 h at 500-900 ℃ in a non-oxidizing atmosphere; uniformly mixing the reduction roasting clinker with water according to the solid-to-liquid ratio of 0.2-0.5 g/ml, and stirring and aging for 1-12 h at the temperature of 20-60 ℃; and after aging, continuing hydrothermal crystallization at 80-110 ℃ for 6-18 h, and performing solid-liquid separation to obtain the magnetic zeolite. The invention realizes the resource utilization of the red mud and the carbon-containing aluminum silicon waste and obtains the magnetic zeolite. The obtained magnetic zeolite can be used for treating various types of wastewater such as heavy metal, organic matter pollution and the like, and can realize separation, recovery and cyclic utilization in a mode of an external magnetic field.
Description
Technical Field
The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a method for preparing magnetic zeolite by using red mud in cooperation with carbon-containing aluminum-silicon waste.
Background
Red mud is a solid waste produced in the process of producing alumina from bauxite, is red due to being rich in iron oxide, and is called red mud. The output, components and properties of red mud are greatly different due to different bauxite producing areas and different production processes of alumina. Usually, about 0.8-2.0 t of red mud is generated per 1t of alumina, the annual output of the red mud in China is about 1 hundred million tons, and in addition, the historical stock of the red mud exceeds 7.9 hundred million tons. However, due to the characteristics of fine granularity, complex components, strong alkalinity and the like of the red mud, the red mud is difficult to be recycled, and the comprehensive utilization rate of the red mud in China is only about 5 percent. The red mud is produced and stockpiled in large quantity, and cannot be effectively utilized, so that the land is invaded, and serious environmental pollution and ecological damage are caused. The development of the resource comprehensive utilization of the red mud has important significance for the sustainable development of the aluminum industry and the ecological environment protection.
The red mud is typical aluminosilicate waste, contains a large amount of silicon and aluminum, has similar components with zeolite, and can be used as a potential raw material for preparing zeolite. Compared with chemical reagents, the red mud has the advantages of large amount, low price, easy obtainment and the like, and the red mud is used for replacing the chemical reagents to synthesize the zeolite, so that the preparation cost of the zeolite can be reduced, and an effective way can be provided for resource utilization of the red mud. The traditional zeolite has abundant micropores and larger specific surface area, and the crystal structure has certain electronegativity, thereby showing excellent adsorptivity, cation exchange property and molecular sieve characteristic and being widely applied to the field of water treatment; but the fine particles thereof make it difficult to rapidly separate from the aqueous solution after application, thereby affecting the application effect. The method is an effective method for preparing magnetic zeolite by loading magnetic particles in zeolite and then realizing rapid separation by an external magnetic field. At present, the preparation of magnetic zeolites mainly comprises three routes: one is that magnetic particles and zeolite are mixed by physical methods such as grinding, for example, patent CN201510157695.9 discloses a magnetic zeolite and its preparation method, magnetic iron powder is used to cover natural clinoptilolite to prepare magnetic zeolite; secondly, adding a precursor for forming nano magnetite, precipitating the magnetite on the surface of zeolite particles to generate the magnetite, and dissolving ferrous iron and ferric iron salt in water, stirring, adding zeolite powder and compounding to prepare the magnetic zeolite according to the patent CN 201510222596.4; thirdly, magnetic particles are combined with zeolite in the process of synthesizing zeolite, and in patent CN202010258427.7, kaolin slurry is mixed with ferric trichloride hexahydrate, and then the magnetic zeolite is synthesized. Most of the methods have the problems of introduction of additional chemical reagents, uneven loading and the like, and the development of a new method for preparing the magnetic zeolite by resource utilization of the red mud has practical significance.
The red mud is uniformly distributed with iron, aluminum, silicon and other elements, wherein the iron mainly exists in a non-magnetic hematite form and can be converted into magnetic ferroferric oxide by reduction roasting; the aluminum-silicon ratio of the red mud is usually more than 1, and the red mud and aluminosilicate with the aluminum-silicon ratio less than 1 are mixed to prepare materials, so that the aluminum-silicon ratio of the mixed materials can reach the aluminum-silicon ratio required by zeolite; a large amount of alkaline substances are left in the red mud and can react with aluminosilicate in the roasting process to generate a high-activity phase which is easy to be crystallized subsequently.
Disclosure of Invention
The invention aims to provide a method for preparing magnetic zeolite by utilizing red mud and carbon-containing aluminum-silicon wastes, so as to obtain high-performance magnetic zeolite while realizing resource utilization of the red mud and the carbon-containing aluminum-silicon wastes.
The invention adopts the following technical scheme:
the invention provides a method for preparing magnetic zeolite by using red mud and carbon-containing aluminum-silicon waste, wherein the magnetic zeolite is prepared by mixing red mud, carbon-containing aluminum-silicon waste (such as coal gangue, gasified slag and the like) and sodium auxiliary (such as sodium hydroxide, sodium carbonate and the like) through the steps of reduction roasting, aging, crystallization and the like, and the specific steps are as follows:
firstly, mixing materials, namely respectively grinding and sieving red mud and carbon-containing aluminum-silicon waste to be smaller than 100 meshes, and then mixing the red mud and the carbon-containing aluminum-silicon waste with a sodium assistant in proportion to obtain a mixed material;
secondly, reducing and roasting, namely placing the mixed material in an atmosphere furnace to roast under a non-oxidizing atmosphere to obtain reducing and roasting clinker;
step three, aging, namely uniformly mixing the reduction roasting clinker with water according to a proportion, and stirring and aging;
and fourthly, crystallizing, namely transferring the aged material into a crystallization kettle, carrying out hydrothermal crystallization, cooling and filtering a product after the hydrothermal crystallization is finished, and washing and drying to obtain the magnetic zeolite.
Further, in the first step, the aluminum-silicon molar ratio of the red mud is more than 1, the aluminum-silicon molar ratio of the carbon-containing aluminum-silicon waste is less than 1, and the mass percentage content of iron oxide in the red mud is not less than 15%.
Further, in the first step, the red mud, the carbon-containing aluminum silicon waste and the sodium additive are mixed according to the molar ratio of Na, Al and Si of the mixed materials of 2.5:1: 1-5: 1: 1.
Furthermore, in the second step, the roasting temperature is 500-900 ℃, and the roasting time is 0.5-3 h.
Further, in the third step, the solid-to-liquid ratio of the reduction roasting clinker to water is 0.2-0.5 g/ml, the aging temperature is 20-60 ℃, and the aging time is 1-12 hours.
Further, in the fourth step, the crystallization temperature is 80-110 ℃, and the crystallization time is 6-18 h.
The invention provides a method for preparing magnetic zeolite by using red mud and carbon-containing aluminum-silicon wastes, which is characterized in that red mud, carbon-containing aluminum-silicon wastes (such as coal gangue, gasified slag and the like) and sodium auxiliaries (such as sodium hydroxide, sodium carbonate and the like) are subjected to reduction roasting at a specific temperature, so that iron-containing phases and aluminum-silicon phases in the red mud are respectively converted into magnetic phases and high-activity phases, and the magnetic zeolite with uniformly distributed phases is further prepared.
The method for preparing the magnetic zeolite by using the red mud and the carbon-containing aluminum silicon waste has the advantages of simple and controllable process and wide product application prospect.
The invention has the following beneficial effects:
1. and adjusting the aluminum-silicon ratio, namely adjusting the aluminum-silicon ratio of the mixed material to the aluminum-silicon ratio required by the target product, namely adjusting the aluminum-silicon ratio of the mixed material without additionally adding an aluminum source and a silicon source by adjusting the composition ratio of the red mud and the carbon-containing aluminum-silicon waste.
2. The consumption of the sodium assistant is obviously reduced, on one hand, the generation of sodium silicate and other byproducts can be avoided by adjusting the aluminum-silicon ratio, the consumption of the alkali assistant is reduced, and on the other hand, the purpose of reducing the consumption of the alkali assistant can be achieved by utilizing the residual alkaline substances in the red mud.
3. And (2) synchronous magnetization, namely, in the process of adding alkali into aluminosilicate for roasting, synchronously reducing nonmagnetic hematite in the red mud by using carbon residues in solid waste through changing the atmosphere, converting the nonmagnetic hematite into magnetic ferroferric oxide, and keeping magnetism in the hydrothermal process to further synthesize the magnetic zeolite without adding an iron source.
4. The product quality is that the iron-containing phase and the aluminosilicate in the red mud are naturally and uniformly embedded, so that the high-quality magnetic zeolite product with uniformly distributed magnetic phase and zeolite phase can be prepared.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is the XRD pattern of red mud and coal gangue in example 1.
Figure 3 is the XRD of the magnetic zeolite product of example 1.
Fig. 4 is an SEM image of the magnetic zeolite product of example 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be further described below, and the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments.
Example 1
Grinding red mud and coal gangue, sieving to be smaller than 100 meshes, adding sodium hydroxide, and uniformly mixing according to the molar ratio of Na, Al and Si of 3.6:1:1 to obtain a mixed raw material for later use; at 600 ℃ N2Reducing and roasting for 1 h under the atmosphere to obtain reducing and roasting clinker; mixing the reduction roasting clinker with water according to the solid-to-liquid ratio of 0.35 g/mL, and stirring and aging at 40 ℃ for 12 hours; transferring the aged material to a crystallization kettle, and carrying out hydrothermal crystallization for 9 hours at 90 ℃; and cooling and filtering the product, and washing and drying to obtain the magnetic zeolite.
Example 2
Grinding red mud and coal gangue, sieving to be smaller than 100 meshes, adding sodium carbonate, and uniformly mixing according to the molar ratio of Na, Al and Si of 4.5:1:1 to obtain a mixed raw material for later use; at 800 ℃ N2Reducing and roasting for 1 h under the atmosphere to obtain reducing and roasting clinker; mixing the reduction roasting clinker with water according to the solid-to-liquid ratio of 0.25 g/mL, and stirring and aging at 50 ℃ for 6 hours; transferring the aged material to a crystallization kettle, and carrying out hydrothermal crystallization for 15 h at 95 ℃; and cooling and filtering the product, and washing and drying to obtain the magnetic zeolite.
Example 3
Grinding red mud and coal gangue, sieving to be smaller than 100 meshes, adding sodium hydroxide, and uniformly mixing according to the molar ratio of Na, Al and Si of 5:1:1 to obtain a mixed raw material for later use; at 600 ℃ N2Reducing and roasting for 1 h under the atmosphere to obtain reducing and roasting clinker; mixing the reduction roasting clinker with water according to the solid-to-liquid ratio of 0.20 g/mL, and stirring and aging at 40 ℃ for 12 hours; transferring the aged material to a crystallization kettle, and carrying out hydrothermal crystallization for 12 hours at 100 ℃; and cooling and filtering the product, and washing and drying to obtain the magnetic zeolite.
Example 4
Grinding red mud and coal gangue, sieving to be smaller than 100 meshes, adding sodium hydroxide, and uniformly mixing according to the molar ratio of Na, Al and Si of 2:1:1 to obtain a mixed raw material for later use; at 500 ℃ N2Reducing and roasting for 2 hours in the atmosphere to obtain reducing and roasting clinker; mixing the reduction roasting clinker with water according to the solid-to-liquid ratio of 0.40 g/mL, and stirring and aging at 50 ℃ for 12 hours; transferring the aged material to a crystallization kettle, and carrying out hydrothermal crystallization for 5 hours at 90 ℃; and cooling and filtering the product, and washing and drying to obtain the magnetic zeolite.
Claims (6)
1. A method for preparing magnetic zeolite by utilizing red mud in cooperation with carbon-containing aluminum silicon waste is characterized by comprising the following steps: the method comprises the following steps:
firstly, mixing materials, namely respectively grinding and sieving red mud and carbon-containing aluminum-silicon waste to be smaller than 100 meshes, and then mixing the red mud and the carbon-containing aluminum-silicon waste with a sodium assistant in proportion to obtain a mixed material;
secondly, reducing and roasting, namely placing the mixed material in an atmosphere furnace to roast under a non-oxidizing atmosphere to obtain reducing and roasting clinker;
step three, aging, namely uniformly mixing the reduction roasting clinker with water according to a proportion, and stirring and aging;
and fourthly, crystallizing, namely transferring the aged material into a crystallization kettle, carrying out hydrothermal crystallization, cooling and filtering a product after the hydrothermal crystallization is finished, and washing and drying to obtain the magnetic zeolite.
2. The method for preparing magnetic zeolite by using red mud in cooperation with carbon-containing aluminum silicon waste according to claim 1, which is characterized in that: in the first step, the aluminum-silicon molar ratio of the red mud is more than 1, the aluminum-silicon molar ratio of the carbon-containing aluminum-silicon waste is less than 1, and the mass percentage content of iron oxide in the red mud is not less than 15%.
3. The method for preparing magnetic zeolite by using red mud in cooperation with carbon-containing aluminum silicon waste according to claim 1, which is characterized in that: in the first step, the red mud, the carbon-containing aluminum silicon waste and the sodium assistant are mixed according to the molar ratio of Na, Al and Si of the mixed material of 2.5:1: 1-5: 1: 1.
4. The method for preparing magnetic zeolite by using red mud in cooperation with carbon-containing aluminum silicon waste according to claim 1, which is characterized in that: in the second step, the roasting temperature is 500-900 ℃, and the roasting time is 0.5-3 h.
5. The method for preparing magnetic zeolite by using red mud in cooperation with carbon-containing aluminum silicon waste according to claim 1, which is characterized in that: in the third step, the solid-to-liquid ratio of the reduction roasting clinker to water is 0.2-0.5 g/ml, the aging temperature is 20-60 ℃, and the aging time is 1-12 hours.
6. The method for preparing magnetic zeolite by using red mud in cooperation with carbon-containing aluminum silicon waste according to claim 1, which is characterized in that: in the fourth step, the crystallization temperature is 80-110 ℃, and the crystallization time is 6-18 h.
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Cited By (5)
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| CN115849869A (en) * | 2022-12-10 | 2023-03-28 | 佛山市雅博陶瓷发展有限公司 | Composite energy-saving ecological stone and manufacturing method thereof |
| CN115869909A (en) * | 2022-12-21 | 2023-03-31 | 贵州大学 | Method for preparing magnetic porous biochar @ molecular sieve by modifying red mud |
| CN115921493A (en) * | 2022-12-07 | 2023-04-07 | 山西大学 | Energy-saving and consumption-reducing process for comprehensive recovery of iron, aluminum, silicon and sodium in red mud |
| CN116715251A (en) * | 2023-06-12 | 2023-09-08 | 山东建筑大学 | Method for preparing magnetic molecular sieve by using low-grade iron tailings |
| CN118221124A (en) * | 2024-05-27 | 2024-06-21 | 内蒙古科技大学 | Method for extracting silicon and multi-metal products from activated red mud |
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