CN111073671A - Green and cyclic comprehensive utilization method of red mud and lignin waste - Google Patents
Green and cyclic comprehensive utilization method of red mud and lignin waste Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
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- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
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- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/02—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- 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
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to the technical field of waste resource utilization, in particular to a method for green recycling comprehensive utilization of red mud and lignin waste. The invention comprises the following steps: 1) extracting and separating lignin from agricultural and forestry wastes and waste residues rich in lignin matrix generated in the paper industry or the biorefinery industry to obtain high-purity lignin; 2) carrying out harmless modification treatment on the red mud by an acid dissolution-alkali reprecipitation coupling roasting method; 3) preparing hydrocarbon-rich bio-oil, synthesis gas and biochar by the catalytic pyrolysis of lignin under the cooperation of the modified red mud and a molecular sieve catalyst; 4) the reacted modified red mud is further applied to the field of adsorption materials and the field of building materials. According to the invention, through a co-treatment mode of treating wastes with wastes, the resource utilization of lignin wastes can be realized, meanwhile, the harmless treatment and resource utilization of red mud wastes are realized, the green cycle development of alumina enterprises is further promoted, and the method has good economic and ecological benefit prospects.
Description
Technical Field
The invention relates to the technical field of waste resource utilization, in particular to a method for green recycling comprehensive utilization of red mud and lignin waste.
Background
Red mud is solid waste residue produced in the alumina industry, and one to two tons of red mud can be produced when one ton of alumina is produced on average. China is a large alumina production country, millions of tons of red mud are produced every year, and along with the rapid development of society, the demand on alumina is increasingly large, so that the yield of the red mud is gradually increased in the future. The chemical composition of red mud is mainly composed of Na2O、Al2O3、SiO2、Fe2O3、TiO2And CaO, and the like, has strong basicity (pH is more than 12), trace radioactivity (containing natural radioactive elements such as uranium, thorium and the like), and a small amount of fluoride, belongs to strong basicity waste residue, and has serious alkali pollution. At present, enterprises mainly stack red mud in open dams, the method occupies a large amount of land and increases maintenance and management cost on one hand, and the stacked red mud can pollute the land and underground water, and dust generated after drying can fly with wind, so that the concentration of PM in the atmosphere is increased, air is polluted, the health of human beings, animals and plants is affected, and the ecological environment is seriously damaged.Therefore, the harmless treatment of the red mud has important significance for the green cycle development of alumina enterprises, and meanwhile, the negative environmental impact caused by the red mud is reduced, however, how to realize the high-value utilization of the red mud still faces a serious challenge.
As the second major component of biomass, the natural reserves of lignin are second only to cellulose resources, and are regenerated at a rate of about 500 hundred million tons per year, mainly derived from agricultural and forestry wastes, paper-making industry, biogas engineering and biorefinery industry, and from the present situation, abundant lignin resources have not been effectively developed and utilized. For example, the paper industry needs to extract and separate 14 hundred million tons of cellulose resources from plants every year, and produces up to 5000 ten thousand tons of lignin waste residues, and the treatment mode is mainly discharged into the external river in the form of black liquor or is subjected to simple concentration combustion treatment, so that serious water resource and atmospheric environmental pollution are caused. The unreasonable treatment mode causes further pollution and damage to the environment while wasting resources. Therefore, the development of the related lignin high-added-value conversion process is urgently needed.
At present, the high-value utilization of the red mud focuses on the aspects of flue gas desulfurization, organic pollutant removal, ammonia decomposition hydrogen production, anaerobic digestion methane production, building materials, bio-oil quality improvement, biomass thermochemical conversion and the like. The structural characteristics and catalytic performance of the red mud can be further optimized by modifying the red mud. The preparation of high-quality bio-oil can be realized by the lignin through a catalytic pyrolysis technology, but the problems of low yield and low selectivity of a target product, rapid inactivation of a catalyst and the like still exist at present. Due to the excellent catalytic performance of the red mud, the method provides possibility for high-value utilization of the red mud in the field of catalytic pyrolysis of lignin. Therefore, the red mud is subjected to necessary modification treatment, the strong basicity of the red mud is reduced, meanwhile, conditions are created for high added value utilization of the red mud, the red mud is introduced into the catalytic pyrolysis process of the lignin, the generation amount of a target product is increased, and rapid inactivation of a catalyst is slowed down, so that the method has important significance. In addition, the high-value utilization of two typical waste resources, namely red mud and lignin, can promote the development of a cross-industrial waste coupling utilization technology, and is a key point about the development of green recycling economy.
Disclosure of Invention
The invention aims to solve the problem of waste resource utilization, provides a method for green cyclic comprehensive utilization of red mud and lignin waste, promotes resource and harmless treatment of the red mud waste, improves the application potential of the red mud in the field of lignin catalytic conversion, and achieves the purpose of green cyclic comprehensive utilization of the red mud and the lignin waste.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a green recycling and comprehensive utilization method of red mud and lignin wastes comprises the following steps:
1) extracting and separating lignin from agricultural and forestry wastes and waste residues rich in lignin matrix generated in the paper industry or the biorefinery industry to obtain high-purity lignin;
2) carrying out harmless modification treatment on the red mud by an acid dissolution-alkali reprecipitation coupling roasting method;
3) preparing hydrocarbon-rich bio-oil, synthesis gas and biochar by the catalytic pyrolysis of lignin under the cooperation of the modified red mud and a molecular sieve catalyst;
4) the reacted modified red mud is further applied to the field of adsorption materials and the field of building materials.
Preferably, in the step 1), the lignin extraction and separation method is a carlson method, an organic solvent method, an ionic liquid method or an enzyme hydrolysis method.
Preferably, in the step 2), in the acid dissolution-alkali reprecipitation coupling roasting method for the red mud, an inorganic acid with a concentration of 5-7mol/L is adopted for acid dissolution treatment, and the inorganic acid is hydrochloric acid, sulfuric acid or phosphoric acid; ammonia water with the mass fraction of 30-40% is adopted for alkali reprecipitation treatment, and the roasting treatment temperature is 635-660 ℃.
Preferably, in step 2), the waste liquid obtained from the modification treatment can be used for removing inorganic impurities contained in the lignin, wherein the inorganic impurities comprise alkali metals and alkaline earth metals.
Preferably, in step 3), the molecular sieve catalyst is one or more of HZSM-5, H β and H-USY, and the molecular sieve catalysts are all commercial molecular sieves.
Preferably, in the step 3), the equipment adopted for catalytic pyrolysis of lignin is a fixed bed pyrolysis reactor, the reaction temperature is 450-650 ℃, the modified red mud and the molecular sieve catalyst are arranged in a layered manner, and the mass ratio of the modified red mud to the molecular sieve catalyst is 1: 0.7-1.5, wherein the ratio of the mass of the lignin to the sum of the mass of the modified red mud and the mass of the molecular sieve catalyst is 1: 1.5-2.2, nitrogen is adopted to ensure the inert atmosphere of pyrolysis.
Preferably, the hydrocarbon-rich bio-oil is refined, separated and extracted to obtain aromatic compounds for improving the octane number of gasoline or diesel oil; the biochar is used for preparing an activated carbon material or a carbon-based compound fertilizer; and the synthesis gas is used as a reaction raw material for Fischer-Tropsch synthesis after separation and purification.
Preferably, the adsorption material field comprises a sewage purification field, a waste dye solution field and a heavy metal adsorption field; the building material field comprises the concrete preparation field, the building brick field and the water permeable brick field.
The invention has the beneficial effects that:
1. the invention adopts an acid dissolution-alkali reprecipitation coupling roasting method to carry out harmless modification treatment on the red mud, obviously improves the physical and chemical properties of the red mud, and creates conditions for high added value utilization of the red mud. The red mud modification treatment process obviously reduces the inherent strong alkaline elements such as Na, Ca and the like, reduces the strong alkalinity of the red mud, and simultaneously, the modified waste liquor can be used for removing the inherent inorganic impurities such as alkali metals, alkaline earth metals and the like in the lignin structure.
2. The modified red mud can be used as a low-cost catalyst coupled with a molecular sieve catalyst to realize the catalytic pyrolysis of lignin to prepare hydrocarbon-rich bio-oil and simultaneously co-produce biochar and synthesis gas. The content of aromatic hydrocarbon components in the hydrocarbon-rich bio-oil can reach up to 70%, the selectivity of monocyclic aromatic hydrocarbon can reach up to 60%, and the hydrocarbon-rich bio-oil is refined, separated and extracted to obtain aromatic hydrocarbon compounds, so that the octane number of gasoline or diesel oil can be better improved. In addition, the biochar can be further used for preparing an activated carbon material or a carbon-based compound fertilizer, and the synthesis gas can be further separated and purified to be used as a reaction raw material for Fischer-Tropsch synthesis.
3. According to the invention, the resource utilization of the red mud and lignin waste is promoted by a co-treatment mode of 'treating waste by waste', on one hand, the resource and harmless treatment of the red mud reduces the waste management cost of alumina enterprises, improves the competitiveness of the enterprises and promotes the green cycle development of the enterprises. On the other hand, the modified red mud low-cost catalyst is introduced in the catalytic pyrolysis process of the lignin, so that the content of aromatic hydrocarbon compounds in the bio-oil is increased, high-value biochar and synthesis gas are co-produced, the rapid inactivation of a commercial catalyst is slowed down, the economy of the catalytic pyrolysis technology is improved, and the energy utilization of the lignin waste residues is realized. The method provides a basic reference for the development of the cross-industrial waste coupling utilization technology, and has important significance for the development of green circular economy.
Drawings
FIG. 1 is a process flow chart of green recycling comprehensive utilization of red mud and lignin wastes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1, a green recycling and comprehensive utilization method of red mud and lignin wastes comprises the following steps:
1) separating and preparing high-purity lignin resources from waste residue rich in lignin matrix generated by agricultural and forestry waste by using a Carlson method.
2) The red mud is subjected to harmless modification treatment by an acid dissolution-alkali reprecipitation coupling roasting method.
Specifically, 25Kg of red mud is mixed with 150L of sulfuric acid (the concentration is 6mol/L), and the mixture is digested for 2 hours at 85 ℃ to obtain a brownish yellow suspension, ammonia water with the mass fraction of 36% is added dropwise under vigorous stirring until the pH value is about 8, then the mixture is subjected to ultrasonic treatment for 15 minutes, and the mixture is filtered, washed with distilled water and ethanol to be neutral, dried for 12 hours at 105 ℃ in an air drying oven, ground and sieved to 60-80 meshes, and then transferred to a muffle furnace to be roasted for 5 hours at 650 ℃ to obtain the modified red mud low-cost catalyst.
Wherein the waste liquid obtained by modification treatment can be further used for removing inorganic impurities such as alkali metals, alkaline earth metals and the like contained in the lignin.
3) And then catalytically pyrolyzing lignin on a fixed bed pyrolysis reactor by using the modified red mud in cooperation with a molecular sieve catalyst (commercial molecular sieve HZSM-5) to coproduce hydrocarbon-rich bio-oil, biochar and synthesis gas. The reaction temperature is controlled between 450 ℃ and 520 ℃.
The catalyst layers of the modified red mud and the molecular sieve catalyst are arranged in layers in the reaction tube, and the mass ratio of the modified red mud to the molecular sieve catalyst is 1: 1, the ratio of the mass of the lignin to the sum of the mass of the modified red mud and the mass of the molecular sieve catalyst is 1: 2, nitrogen is used to ensure the inert atmosphere required for the entire pyrolysis. And the lignin pyrolysis gas passes through the modified red mud and the molecular sieve catalyst in sequence, and finally the graded conversion of the pyrolysis gas is realized.
4) The reacted modified red mud is further applied to the fields of adsorption materials and building materials.
Example 2:
a green recycling and comprehensive utilization method of red mud and lignin wastes comprises the following steps:
1) separating the waste residue rich in lignin matrix produced in the paper industry by an organic solvent method to prepare the high-purity lignin resource.
2) The red mud is subjected to harmless modification treatment by an acid dissolution-alkali reprecipitation coupling roasting method.
Specifically, 25Kg of red mud is mixed with 150L of hydrochloric acid (the concentration is 7mol/L), and the mixture is digested for 2.5 hours at 82 ℃ to obtain a brownish yellow suspension, ammonia water with the mass fraction of 30% is added dropwise under vigorous stirring until the pH value is about 8, then the mixture is subjected to ultrasonic treatment for 15 minutes, and the mixture is filtered, washed with distilled water and ethanol to be neutral, dried for 12 hours at 105 ℃ in an air drying oven, ground and sieved to 60-80 meshes, and then transferred to a muffle furnace to be roasted for 6 hours at 635 ℃ to obtain the modified red mud low-cost catalyst.
Wherein the waste liquid obtained by modification treatment can be further used for removing inorganic impurities such as alkali metals, alkaline earth metals and the like contained in the lignin.
3) And then catalytically pyrolyzing lignin on a fixed bed pyrolysis reactor by using the modified red mud in cooperation with a molecular sieve catalyst (commercial molecular sieve H-USY) to coproduce hydrocarbon-rich bio-oil, biochar and synthesis gas. The reaction temperature is controlled between 580 ℃ and 650 ℃.
The catalyst layers of the modified red mud and the molecular sieve catalyst are arranged in layers in the reaction tube, and the mass ratio of the modified red mud to the molecular sieve catalyst is 1: 0.7, wherein the ratio of the mass of the lignin to the sum of the mass of the modified red mud and the mass of the molecular sieve catalyst is 1: 2.2, nitrogen is used to ensure the inert atmosphere required for the entire pyrolysis. And the lignin pyrolysis gas passes through the modified red mud and the molecular sieve catalyst in sequence, and finally the graded conversion of the pyrolysis gas is realized.
4) The reacted modified red mud is further applied to the fields of adsorption materials and building materials.
Example 3:
a green recycling and comprehensive utilization method of red mud and lignin wastes comprises the following steps:
1) the waste residue rich in lignin matrix produced in the biorefinery industry is separated by an enzymatic hydrolysis method to prepare the high-purity lignin resource.
2) The red mud is subjected to harmless modification treatment by an acid dissolution-alkali reprecipitation coupling roasting method.
Specifically, 25Kg of red mud is mixed with 150L of phosphoric acid (the concentration is 5mol/L), and the mixture is digested for 2 hours at 85 ℃ to obtain a brownish yellow suspension, ammonia water with the mass fraction of 40% is added dropwise under vigorous stirring until the pH value is about 8, then the mixture is subjected to ultrasonic treatment for 18 minutes, and the mixture is filtered, washed with distilled water and ethanol to be neutral, dried for 12 hours at 105 ℃ in an air drying oven, ground and sieved to 60-80 meshes, and then transferred to a muffle furnace to be roasted for 4.5 hours at 660 ℃ to obtain the modified red mud low-cost catalyst.
Wherein the waste liquid obtained by modification treatment can be further used for removing inorganic impurities such as alkali metals, alkaline earth metals and the like contained in the lignin.
3) And then catalytically pyrolyzing lignin on a fixed bed pyrolysis reactor by using the modified red mud in cooperation with a molecular sieve catalyst (commercial molecular sieve H β) to coproduce hydrocarbon-rich bio-oil, biochar and synthesis gas, wherein the reaction temperature is controlled to be between 500 ℃ and 580 ℃.
The catalyst layers of the modified red mud and the molecular sieve catalyst are arranged in layers in the reaction tube, and the mass ratio of the modified red mud to the molecular sieve catalyst is 1: 1.5, the ratio of the mass of the lignin to the sum of the mass of the modified red mud and the mass of the molecular sieve catalyst is 1: 1.5, nitrogen is used to ensure the inert atmosphere required for the entire pyrolysis. And the lignin pyrolysis gas passes through the modified red mud and the molecular sieve catalyst in sequence, and finally the graded conversion of the pyrolysis gas is realized.
4) The reacted modified red mud is further applied to the fields of adsorption materials and building materials.
The content of aromatic hydrocarbon components in the hydrocarbon-rich bio-oil prepared in the embodiments 1-3 can reach up to 70%, the selectivity of monocyclic aromatic hydrocarbon can reach up to 60%, and aromatic hydrocarbon compounds can be extracted by refining separation and used for improving the octane number of gasoline or diesel oil.
The biochar can be further used as a raw material for preparing an activated carbon material or a carbon-based compound fertilizer, the synthesis gas can be further separated and purified to be used as a reaction raw material for Fischer-Tropsch synthesis, and in addition, the introduction of the modified red mud further reduces the carbon deposition amount on the surface of the molecular sieve catalyst in the catalytic pyrolysis process of lignin, and slows down the occurrence of the rapid deactivation phenomenon of the catalyst.
The reacted modified red mud can be applied to the fields of sewage purification, waste dye liquor and heavy metal adsorption when being used as an adsorbing material, and can be used as a preparation raw material of concrete, building bricks and permeable bricks when being used as a building material.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A green recycling and comprehensive utilization method of red mud and lignin wastes is characterized by comprising the following steps:
1) extracting and separating lignin from agricultural and forestry wastes and waste residues rich in lignin matrix generated in the paper industry or the biorefinery industry to obtain high-purity lignin;
2) carrying out harmless modification treatment on the red mud by an acid dissolution-alkali reprecipitation coupling roasting method;
3) preparing hydrocarbon-rich bio-oil, synthesis gas and biochar by the catalytic pyrolysis of lignin under the cooperation of the modified red mud and a molecular sieve catalyst;
4) the reacted modified red mud is further applied to the field of adsorption materials and the field of building materials.
2. The method for green recycling and comprehensive utilization of red mud and lignin wastes according to claim 1, wherein in the step 1), the lignin extraction and separation method is a Carlson method, an organic solvent method, an ionic liquid method or an enzymatic hydrolysis method.
3. The method for green recycling and comprehensive utilization of red mud and lignin wastes according to claim 1, wherein in the step 2), in the acid dissolution-alkali reprecipitation coupled roasting method of red mud, an inorganic acid with a concentration of 5-7mol/L is adopted for acid dissolution treatment, and the inorganic acid is hydrochloric acid, sulfuric acid or phosphoric acid; ammonia water with the mass fraction of 30-40% is adopted for alkali reprecipitation treatment, and the roasting treatment temperature is 635-660 ℃.
4. The method for green recycling and comprehensive utilization of red mud and lignin wastes according to claim 1, wherein in the step 2), the waste liquid obtained from the modification treatment can be used for removing inorganic impurities contained in lignin, and the inorganic impurities comprise alkali metals and alkaline earth metals.
5. The green recycling and comprehensive utilization method of red mud and lignin wastes according to claim 1, wherein in the step 3), the molecular sieve catalyst is one or more of HZSM-5, H β and H-USY.
6. The method for green recycling and comprehensive utilization of red mud and lignin wastes according to claim 1, wherein in the step 3), the equipment adopted for catalytic pyrolysis of lignin is a fixed bed pyrolysis reactor, the reaction temperature is 450 ℃ and 650 ℃, the modified red mud and the molecular sieve catalyst are arranged in layers, and the mass ratio of the modified red mud to the molecular sieve catalyst is 1: 0.7-1.5, wherein the ratio of the mass of the lignin to the sum of the mass of the modified red mud and the mass of the molecular sieve catalyst is 1: 1.5-2.2, nitrogen is adopted to ensure the inert atmosphere of pyrolysis.
7. The method for green cycle comprehensive utilization of red mud and lignin wastes according to claim 1, wherein the hydrocarbon-rich bio-oil is refined, separated and extracted to obtain aromatic compounds for improving octane number of gasoline or diesel oil; the biochar is used for preparing an activated carbon material or a carbon-based compound fertilizer; and the synthesis gas is used as a reaction raw material for Fischer-Tropsch synthesis after separation and purification.
8. The method for green recycling and comprehensive utilization of red mud and lignin wastes according to claim 1, wherein the fields of adsorption materials comprise the field of sewage purification, the field of waste dye liquor and the field of heavy metal adsorption; the building material field comprises the concrete preparation field, the building brick field and the water permeable brick field.
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| CN111974395A (en) * | 2020-09-25 | 2020-11-24 | 郑州大学 | Red mud-based heterogeneous catalyst, preparation method thereof and pollutant degradation method |
| CN111992216A (en) * | 2020-09-11 | 2020-11-27 | 北京科技大学 | Preparation method and application of composite heterojunction photocatalyst |
| CN111992177A (en) * | 2020-09-07 | 2020-11-27 | 贵州大学 | Non-thermal activation red mud particle adsorbent and preparation method thereof |
| CN113023823A (en) * | 2021-04-20 | 2021-06-25 | 昆明理工大学 | Preparation method of composite material for purifying arsenic-containing heavy metal solution |
| CN113398886A (en) * | 2021-07-14 | 2021-09-17 | 中国科学院广州能源研究所 | Method for co-producing adsorption activated carbon and biological aviation fuel precursor by using waste lignin |
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| CN111992177B (en) * | 2020-09-07 | 2022-09-02 | 贵州大学 | Non-thermal activation red mud particle adsorbent and preparation method thereof |
| CN111992216A (en) * | 2020-09-11 | 2020-11-27 | 北京科技大学 | Preparation method and application of composite heterojunction photocatalyst |
| CN111974395A (en) * | 2020-09-25 | 2020-11-24 | 郑州大学 | Red mud-based heterogeneous catalyst, preparation method thereof and pollutant degradation method |
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| CN113398886A (en) * | 2021-07-14 | 2021-09-17 | 中国科学院广州能源研究所 | Method for co-producing adsorption activated carbon and biological aviation fuel precursor by using waste lignin |
| CN115478164A (en) * | 2022-10-25 | 2022-12-16 | 四川大学 | Application of lignin adsorbent in uranium-thorium separation |
| CN115478164B (en) * | 2022-10-25 | 2023-07-11 | 四川大学 | Application of lignin adsorbent in uranium-thorium separation |
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