892results about How to "Environmentally friendly" patented technology

The invention belongs to the technical field of waste resource recycling, and discloses a preparation method and application of a solid acid catalyst for degrading waste PET to prepare TPA, and the solid acid catalyst for degrading waste PET to prepare TPA is a heteropolyacid asymmetric biquaternary ammonium salt solid acid catalyst with a phase transfer function. The preparation method comprises the following steps: carrying out an ion exchange reaction on an asymmetric biquaternary ammonium salt surfactant and heteropoly acid according to a molar ratio of (0.5-1.5): 1 to prepare the solid acid catalyst for degrading waste PET to prepare TPA; the application of the solid acid catalyst comprises the following steps: adding the waste PET, the solid acid catalyst and distilled water into a polytetrafluoroethylene or para-polyphenyl lining of a self-pressure-generating reaction kettle according to a certain mass ratio, and reacting at 180-220 DEG C for 4-24 hours by using a homogeneous reactor. The preparation method disclosed by the invention is simple and convenient in process, and the prepared solid acid catalyst has excellent catalytic degradation performance, can be recycled for multiple times, and is environment-friendly and resource-saving.

The invention discloses a desliming device for mining and beneficiation operation, and relates to the technical field of mineral engineering, in particular to a desliming device for mining and beneficiation operation, which comprises a main machine body, a U-shaped groove is attached and connected to the top of the main machine body, and a flow dividing box is arranged at one end of the main machine body; and a hydrocyclone is arranged between the main machine body and the flow dividing box. According to the desliming device for mining and beneficiation operation, fine separation of minerals with different densities and particle sizes is achieved through stirring of the U-shaped groove, screening of the sieve plate, separation of the hydrocyclone and extrusion of the mesh belt, the desliming quality is improved, finally, final solid-liquid separation is achieved through relative movement and extrusion of the upper mesh belt and the lower mesh belt, and the desliming efficiency is improved. By means of the device, it is ensured that substances in different phase states are separated and treated according to an expected mode, the convenience and the environmental protection property of subsequent treatment are improved, the problem that silt is difficult to clean in traditional equipment is solved through the convenient cleaning mode of all the parts, and the fault risk and secondary pollution caused by silt residues of the equipment are reduced.

The invention provides a method for synthesizing cyclic carbonate by catalyzing conversion of carbon dioxide with a ZIF-8-coated In2O3 composite material, and belongs to the field of catalytic chemistry. According to the method, carbon dioxide and an epoxy compound are used as raw materials, a ZIF-8-coated In2O3 composite material is used as a catalyst, tetrabutylammonium bromide is used as a cocatalyst, cycloaddition of the epoxy compound and normal-pressure carbon dioxide is performed to synthesize cyclic carbonate, and the ZIF-8-coated In2O3 composite material is prepared by in-situ compounding of ZIF-8 and In2O3 of a hollow prism structure. The ZIF-8-coated In2O3 nano-composite catalyst provided by the invention is simple to prepare, the raw materials are cheap and easy to obtain, the catalytic performance is excellent, and high-selectivity synthesis of cyclic carbonate under mild conditions can be realized. In addition, the catalyst is stable in structure, easy to separate from a product and good in recycling performance, and belongs to an environment-friendly catalyst.

The invention relates to a molten steel slag centrifugal granulation treatment and waste heat recovery system which is characterized in that a slag inlet is formed in the top of a centrifugal granulation bin, a rotating disc and a rotation driving motor are arranged in the centrifugal granulation bin, the rotating disc is arranged below the slag inlet, and the rotating disc is driven by the rotation driving motor; the low-melting-point eutectic metal self-flowing bed waste heat boiler is arranged below the centrifugal granulation bin, a self-flowing bed waste heat boiler heat exchange pipe is arranged in the low-melting-point eutectic metal self-flowing bed waste heat boiler, and low-melting-point eutectic metal is loaded in the self-flowing bed waste heat boiler heat exchange pipe. High-grade waste heat recovery of the high-temperature molten steel slag is achieved, the blank of heat energy recovery of a steel mill is filled up, and energy conservation, emission reduction and carbon reduction of the steel mill are greatly promoted. The two links of centrifugal granulation treatment and waste heat recovery are comprehensively and integrally designed, the structure is simpler and more compact, the efficiency is higher, operation is easy and convenient, the production implementation process is safe, and the device can be applied and popularized in ferrous metallurgy enterprises.

The invention provides a biochar loaded sulfur modified zero-valent iron material and application thereof in groundwater remediation, and particularly relates to the technical field of inorganic materials. According to the biochar-loaded sulfur-modified zero-valent iron material, sulfur-modified zero-valent iron is loaded in a porous structure of biochar; the sulfur modified zero-valent iron has a core-shell structure; wherein the inner core of the core-shell structure is zero-valent iron, and the outer shell of the core-shell structure is iron sulfide. According to the biochar-loaded sulfur-modified zero-valent iron material provided by the invention, a sulfide layer is formed on the surface of zero-valent iron, so that a zero-valent iron core is prevented from being in direct contact with water or dissolved oxygen, and the durability of the zero-valent iron core is improved. Delocalized electrons in the sulfide layer promote the electron transfer process, and the catalytic performance of the material is enhanced. The biochar loaded sulfur modified zero-valent iron material provided by the invention is high in stability and wide in application range. Due to the multifunctionality of the material, the material has potential application value in a plurality of fields such as environmental restoration and pollutant degradation.

The invention discloses a preparation method of a Pt / TiO2 catalyst and its application in NH3-SCO reaction. The preparation method comprises the following steps: providing nano titanium dioxide; mixing a platinum source, water and alcohol to prepare a platinum source solution; placing the nano titanium dioxide in the platinum source solution, turning on ultraviolet light for photodeposition reaction, and then filtering and drying the precipitate to obtain a Pt / TiO2 catalyst. The method can prepare a Pt / TiO2 catalyst with low noble metal loading, high and low temperature activity and high N2 selectivity.

The invention provides photo-crosslinking conductive ink based on aliphatic polycarbonate as well as a preparation method and application of the photo-crosslinking conductive ink. The photo-crosslinking conductive ink comprises an aliphatic polycarbonate polymer, a plasticizer, a crosslinking agent, a crosslinking catalyst and a photo-crosslinking agent. According to the invention, a carbonate monomer 5-methyl-5-carboxyl trimethylene carbonate initiated by PEG2000 is adopted, and an aliphatic polycarbonate polymer is synthesized through a copolymerization reaction and is used as a main matrix material of the conductive ink; the conductive ink not only has good conductivity, but also has biocompatibility and environmental friendliness, and the application range of the conductive ink in the fields of medical instruments, biosensors and the like is widened; the excellent mechanical property ensures that the conductive ink can keep structural integrity and functional stability in practical application, and the conductive ink is particularly suitable for flexible electronic devices and wearable equipment which need to be frequently bent and stretched. The preparation steps are simple and convenient, the process is controllable, raw materials are easy to obtain, energy consumption in the process is low, and the cost advantage is achieved.

The invention belongs to the field of pesticide and chemical fertilizers, and particularly discloses a granular slow-release water-soluble fertilizer and a preparation method thereof.The granular slow-release water-soluble fertilizer is prepared from, by weight, 2-5 parts of a slow-release material and 60-70 parts of an element water-soluble fertilizer; wherein the element water-soluble fertilizer comprises liquid ammonia, phosphorus pentoxide, sulfuric acid, zinc sulfate, potassium sulfate, ammonium nitrate phosphorus and monoammonium phosphate; the sustained-release material comprises lignin and PLA, and the granular sustained-release water-soluble fertilizer is high in quick-acting property, less in permeation loss and long in drug release time.

The invention relates to an electrode material for lithium extraction, a preparation method of the electrode material, a lithium extraction electrode and a lithium extraction system, belongs to the field of salt lake lithium extraction, and solves at least one of the problems of fast capacity fading, relatively low overall lithium extraction efficiency and short service life of a lithium extraction electrode for an alkaline solution in the prior art. A preparation method of an electrode material for lithium extraction comprises the following steps: mixing an electrode active material with a rare earth salt solution, and forming a phosphate rare earth layer on the surface of the electrode active material in an in-situ coating manner; the electrode active material comprises lithium iron phosphate and a doped derivative thereof. When the preparation method, the obtained electrode material, the lithium extraction electrode and the lithium extraction system are applied to lithium extraction of salt lake brine, especially alkaline brine, at least one of the cycle performance, the lithium extraction efficiency and the service life is remarkably improved.

The invention discloses a method for degrading micro-plastics by using a composite semiconductor photocatalyst, and relates to the field of environmental protection, in the preparation process, transition metal copper powder and semiconductor material titanium dioxide are firstly mixed and dispersed in absolute ethyl alcohol, so that the copper powder and the titanium dioxide can be ensured to be fully and uniformly mixed together; and filtering, drying and calcining together to obtain the copper oxide and titanium dioxide composite semiconductor material. The defect that titanium dioxide is low in response to visible light is effectively overcome, electron-hole separation is promoted, the electron-hole mobility is improved, the catalyst convenient to prepare is provided for photocatalytic degradation of micro-plastics at normal temperature and normal pressure, and the method has the advantages of being simple in process, low in price, mild in reaction condition and the like.

The invention belongs to the technical field of anti-fingerprint coating materials, and provides a tung oil derivative composite fluoride-free anti-fingerprint transparent coating material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a polydimethylsiloxane modified polyurethane acrylate prepolymer, a tung oil-based photoactive monomer, a photoinitiator and an organic solvent, coating a pretreated base material with the mixed coating, and carrying out ultraviolet curing to obtain the tung oil derivative composite fluoride-free fingerprint-resistant transparent coating material. The coating material disclosed by the invention has an excellent hydrophobic effect and excellent fingerprint resistance; the tung oil-based photoactive monomer can increase the content of bio-based substances in the coating and improve the green environmental protection property of the coating. The transparent coating provided by the invention has a water contact angle close to 110 degrees, light transmittance of 85% or more, and fingerprint resistance that fingerprints can be removed only by wiping the transparent coating with tissues for 4 times or less.

The invention discloses a preparation method of a nanofiber membrane capable of adsorbing various perfluorinated and polyfluoroalkyl substances, which comprises the following steps of: obtaining a nanofiber membrane spun by mixing quaternized chitosan and polyvinyl alcohol by adopting an electrostatic spinning and glutaraldehyde crosslinking method, and directly immersing the nanofiber membrane into environmental water for use; short-chain perfluorocarboxylic acid, long-chain perfluorocarboxylic acid, short-chain perfluorosulfonic acid, long-chain perfluorosulfonic acid and perfluoroalkyl ether carboxylic acid in tap water, surface water, underground water, domestic sewage, industrial sewage, agricultural sewage or medical wastewater can be efficiently and simultaneously adsorbed and removed; various types of perfluoro and polyfluoroalkyl substances such as perfluoro nonoxybenzene sulfonates and chlorinated polyfluoroether sulfonates can be selected from various types of perfluoro and polyfluoroalkyl substances. And after adsorption removal is completed, taking out the wastewater from the environmental water to complete solid-liquid separation. Compared with an existing adsorbent, the adsorbent has the advantages that more types of perfluorinated and polyfluoroalkyl substances can be adsorbed and removed at the same time, the adsorption and removal efficiency on short-chain perfluorinated substances is higher, and the applicable environment water matrix is wider.

The invention discloses a CeO2-MnOx superfine nanofiber catalyst as well as an electrostatic spinning preparation method and application thereof, and belongs to the technical field of material preparation and environmental protection. N-N dimethylformamide (DMF) is adopted as a solvent, cerium nitrate hexahydrate and manganese acetate tetrahydrate are adopted as precursor salts, polyvinylpyrrolidone (PVP) is adopted as a flocculating agent, a gelatinous precursor solution is formed, jet stretching is performed under the high-voltage electrostatic effect, a nanofiber membrane is obtained at the collecting end, and after drying, the CeO2-MnOx superfine nanofiber is obtained through calcination of a stepped heating program. The diameter of the catalyst is 300-400 nm, the catalyst has good oxidation reduction capacity, by means of the efficient electron transfer capacity of the nanofiber morphology and the confinement effect of a fiber cavity, the catalyst shows excellent ultralow-temperature denitration activity and sulfur resistance, denitration reaction is carried out within the temperature range of 75-225 DEG C, the NO conversion rate can be 95% or above, and the catalyst has the advantages of being low in cost and high in efficiency. The catalyst can be applied to the field of flue gas ammonia selective catalytic denitration in non-power industry, and has a good industrial application prospect.

The invention discloses a method for generating calcium carbonate through microorganism mineralization by exciting gypsum solid waste, and belongs to the field of solid waste recycling. The method comprises the following steps: pretreating the gypsum solid waste; exciting the gypsum solid waste; preparing a microbial bacterial liquid; and mixing the microbial liquid with the excited calcium source. According to the method, the gypsum solid waste is used as a calcium source substitute for generating calcium carbonate through microbial mineralization, so that the problems of singleness and high price of a calcium source in a microbial mineralization technology are solved, and meanwhile, the gypsum solid waste can be greatly and reasonably recycled. Meanwhile, a new solution is provided for large-scale application of a microbial mineralization technology. Besides, the utilization of the gypsum solid waste can further reduce the cost of the technology, the pure-phase calcium carbonate can be generated through one-time microbial mineralization, CO2 gas does not need to be introduced, various chemical reagents do not need to be used, the process is simple, and the equipment requirement is low.

The invention relates to the technical field of green belt trimming application, in particular to an automatic highway green belt trimming device which comprises a cross beam, a limiting assembly, a trimming assembly and a smashing assembly.The automatic highway green belt trimming device is exquisite in design, compact in size and capable of working under the condition of not occupying too much space; the cross beam serves as a main structural part, the supporting legs are vertically fixed to the bottom end of the cross beam, the advancing wheels are installed at the bottom ends of the supporting legs, and through the design, the device can move front and back on an expressway without occupying too much lane space, pruning work can be completed without arranging a roadblock, integration of a hub motor enables the advancing wheels to have the self-walking function, and the practicability is high. Therefore, the trimming device can move autonomously without additional traction or pushing force, the self-walking function greatly improves the efficiency of trimming operation, reduces the labor intensity of workers, and enables the trimming operation to be more flexible and quicker.

The invention belongs to the technical field of silicon carbide ceramic material processing, and particularly relates to a high-purity SiC biscuit and a forming method thereof. The method comprises the following steps that S1, primary ball milling, airing and sieving are conducted on SiC crude sand, and SiC sand is obtained; s2, slurry is prepared, secondary ball milling, vacuum defoaming, initiation, grouting, demolding and drying are conducted, and the high-purity SiC biscuit is obtained. According to the forming method of the high-purity SiC biscuit, by controlling the surface appearance of the crude sand and the cleanliness of an environmental tool and combining with a traditional gel casting means, forming of the high-purity and high-solid-phase-content SiC biscuit is achieved, operation is easy, the period is short, a leading foundation is provided for subsequent sintering and vapor deposition, and the method is suitable for industrial production. And the preparation method has important significance on preparation of high-purity SiC ceramic precision parts for semiconductor equipment. The forming method disclosed by the invention is environment-friendly and is easy to popularize and apply in the field of silicon carbide ceramic material processing.

The invention discloses a thin-wall sheath cable and a rapid forming process thereof, and the thin-wall sheath cable comprises a cable core, an insulating layer wrapping the cable core, and a sheath at the outermost layer. Wherein the cable core is formed by twisting a plurality of copper single wires; the insulating layer is made of a flame-retardant cross-linked polyethylene material; the sheath is made of a modified nylon material. Printing marks of the thin-wall sheath cable body are arranged on the insulating surface, the insulating layer and the sheath are extruded in a segmented mode, and the cable is formed at a time. The thin-wall sheath cable has the characteristics of flame retardance, environmental protection, wear resistance, small outer diameter, light weight, fast heat dissipation, large relative current-carrying capacity, easiness in pipe penetrating construction and the like.

According to the preparation method of the special biochar base fertilizer for saline-alkali soil improvement, the porous characteristic of biomass charcoal and the characteristic that wood vinegar can adjust the pH value of soil are utilized, the special biochar base fertilizer for saline-alkali soil improvement is prepared, and the preparation method is simple, low in cost and environmentally friendly; the obtained charcoal-based fertilizer can be used as a soil conditioner for improvement and recovery of large-area saline-alkali soil. When the biochar base fertilizer is used for saline-alkali soil cotton planting, it is found that the stem diameter, plant height and leaf chlorophyll content of cotton are remarkably increased, the pH, conductivity and volume weight of soil are remarkably reduced, and the porosity and saturated water-holding capacity of the soil are remarkably increased; the biochar-based fertilizer has the potential of adjusting the acid-base imbalance of the saline-alkali soil, improving the soil structure, increasing the organic matter content of the soil, improving the soil fertility and increasing the crop yield, and a sustainable, economical and effective solution can be provided for agricultural production.

The utility model discloses a photovoltaic power station high heat dissipation energy storage cabinet, which comprises an energy storage cabinet and a heat dissipation device, the energy storage cabinet comprises a heat preservation cabinet and an electric appliance cabinet, the electric appliance cabinet is fixedly connected inside the heat preservation cabinet, and a cold air channel, an air distribution channel and an air return channel are respectively arranged between the electric appliance cabinet and the heat preservation cabinet. The heat dissipation device comprises an air cooling box, an air cooling assembly and a drying box, the air cooling assembly is arranged in the air cooling box, the air cooling box is fixedly connected to the upper end of the heat preservation cabinet and the upper end of the electric appliance cabinet, and the air cooling box is communicated with the air return channel and the cold air channel. The lower ends of the heat preservation cabinet and the electric appliance cabinet are fixedly connected with a drying box, a drying assembly is arranged in the drying box, and the upper end of the drying box is communicated with the cold air channel and the air distribution channel. The utility model aims to provide the high-heat-dissipation energy storage cabinet which is efficient in heat dissipation, stable in operation and high in reliability.

The invention provides a fresh tilapia mossambica block preservative and a preparation method thereof, the fresh tilapia mossambica block preservative comprises the following raw materials: natural plant extract, modified biological polysaccharide, organic acid, natural antibacterial peptide, a humectant, deionized water and the like, and propolis extract and astaxanthin can be selected to enhance the effect; wherein the natural plant extract is corncob, zingiber mioga and tartary buckwheat bran extract; the modified biological polysaccharide is obtained by modifying chitosan quaternary ammonium salt, laminarin, cell wall polysaccharide and carboxylic acid. The fresh-keeping agent is prepared through ultrasonic mixing, multilayer electrostatic deposition and other technologies, through the synergistic effect of all the raw materials, a multilayer coating structure is formed through electrostatic deposition, microbial growth can be inhibited, gas exchange can be controlled, water loss can be reduced, the fresh-keeping period of tilapia mossambica blocks can be effectively prolonged, and the quality of the tilapia mossambica blocks can be kept.

The invention discloses a silane modified polyether sealant and a preparation method thereof, and belongs to the technical field of sealants, and through preferable matching of all the components, the prepared product not only has environmental friendliness, but also has good cohesiveness, coating property, weather resistance and durability; the preparation method disclosed by the invention has the characteristics of simple process and safety, and the prepared product can be used for bonding and sealing in the fields of buildings, home decoration, transportation, equipment manufacturing and the like.

The invention provides a damp-heat-resistant insulating material, a preparation method thereof and an environment-friendly electric wire, and the damp-heat-resistant insulating material is prepared from the following raw materials in parts by weight: 50-70 parts of EVA (Ethylene-Vinyl Acetate) resin; 10 to 30 parts of linear low density polyethylene; 10 to 20 parts of ethylene propylene diene monomer; 10 to 20 parts of a compatilizer; 152 to 208 parts of a modified flame retardant; 5-10 parts of an auxiliary agent; 5-8 parts of an anti-termite master batch; the modified flame retardant is a flame retardant treated by an amino silane coupling agent, a vinyl silane coupling agent and a polysiloxane coupling agent. The insulating material provided by the invention can resist the temperature of-40 DEG C to 105 DEG C, has excellent humidity and heat resistance and oxidation resistance, and also has the properties of flame retardance, fire resistance, termite resistance, ultraviolet resistance, environmental protection and the like.

The invention relates to a monatomic tin catalyst for acetylene hydrochlorination reaction as well as a preparation method and application of the monatomic tin catalyst. The preparation method mainly comprises the following steps: performing self-polymerization on a chitosan solution under an acidic condition, performing hydrothermal reaction, washing and drying to prepare a carbon carrier with high nitrogen content; preparing catalyst precursors A with different loading capacities by regulating and controlling different loading capacities of stannous chloride; regulating and controlling different calcining temperatures to obtain a tin catalyst precursor B anchored with nitrogen on the surface of the carbon carrier; and removing unstable functional groups on the surface of the catalyst and unanchored tin atoms in a pickling manner, washing with water, and drying to obtain the monatomic tin catalyst. The prepared monatomic tin catalyst is applied to an acetylene hydrochlorination reaction and shows relatively good catalytic performance (acetylene conversion rate gt; 98%) and catalytic stability (catalytic stability gt; 150 h).

The invention discloses a bio-based high-barrier, waterproof and oilproof paper-based packaging material and a preparation method of the bio-based high-barrier, waterproof and oilproof paper-based packaging material, and belongs to the technical field of packaging materials. And further performing ionic crosslinking on the paint by using metal ions to obtain a crosslinked coating. Natural rubber or epoxidized natural rubber provides better water resistance; the nano cellulose provides excellent gas resistance and oil resistance; and ionic crosslinking can further improve the barrier property of the coating, so that the paper-based packaging material with high barrier property, water resistance and oil resistance is prepared, the raw materials of the paper-based packaging material with high barrier property, water resistance and oil resistance are all derived from bio-based materials, and the paper-based packaging material is degradable, does not pollute the environment, is simple in preparation method and is suitable for large-scale industrial application.

The invention provides a method for preparing nano nickel powder by using plasma. The method comprises the steps that a nickel-containing material serves as an anode, plasma working gas and arc discharge are conducted in a vacuum reaction chamber till the reaction is finished, the reaction chamber is vacuumized, passivation gas is introduced into the reaction chamber, the nanometer nickel powder is obtained after passivation treatment is completed, the plasma working gas is mixed gas composed of oxygen, hydrogen and first gas, and the first gas is mixed gas. The first gas is any one or more of argon, nitrogen and helium. The nanometer nickel powder prepared through the method is good in dispersity and uniform in granularity, and the problem that the nanometer nickel powder prepared through an original growth path is seriously agglomerated is solved.

The utility model relates to an ultrasonic integrated calcium and magnesium removal-saline water recovery device. The device comprises a calcium removal unit, a magnesium removal unit and a saline water recovery unit which are connected in sequence, wherein each unit comprises a stirring paddle type or ultrasonic mixer and a filter. The wastewater is pumped to a calcium removal unit by a booster pump and reacts with additional sodium carbonate to generate calcium carbonate precipitate, and calcium removal is completed after solid-liquid separation; the filtrate enters a magnesium removal unit and reacts with additional sodium hydroxide to generate magnesium hydroxide precipitate, and magnesium removal is completed after solid-liquid separation; the filtrate enters a saline water recovery unit to react with additional hydrochloric acid, redundant sodium carbonate and sodium hydroxide are consumed and converted into sodium chloride, and the sodium chloride enters a saline water collection tank for standby application after being filtered. The whole set of equipment provided by the utility model has a series of advantages of small occupied area, high automation degree, low equipment investment, low operation and maintenance cost and the like, is simple in process and good in effect when being used for treating wastewater, and can recycle water resources and save the purchase of industrial salt at the same time.

The utility model relates to a bag-breaking-free rice hull bale breaker which comprises a mechanical arm, a mechanical arm grabbing mechanism, a rice hull suction stripping device and a collecting hopper, the mechanical arm is connected with the mechanical arm grabbing mechanism, and the mechanical arm grabbing mechanism is provided with spike teeth and a negative pressure suction cup. The spike teeth can be inserted into the bottom of a rice hull bag, the rice hull bag is grabbed upwards through extrusion friction force between rice hulls and transferred to the position above the rice hull suction and stripping device, and the collecting hopper is arranged below the rice hull suction and stripping device. When the rice husks are taken out from the rice husk bag, the original package is not damaged, the operation cost is reduced, and the subsequent deep processing of the rice husks is not influenced.

The invention belongs to the technical field of geotechnical engineering and ocean engineering, and particularly relates to an island ecological bank slope structure and process based on biomimetic mineralization and microorganism self-repairing. The biomimetic mineralization calcareous sand reinforcing layer is prepared by spraying a biomimetic mineralization liquid A and a biomimetic mineralization liquid B onto calcareous sand to mineralize the calcareous sand; the ecological self-repairing calcareous sand concrete layer comprises calcareous sand, cement, fly ash, broken stone, seawater, an additive, microbial self-repairing particles and marine plant grass seeds; and a pebble layer. The invention further discloses a construction process of the island ecological bank slope structure based on biomimetic mineralization and microbial self-repairing. The reinforcing effect is good, the influence on the environment is small, meanwhile, the concrete crack self-repairing function is achieved, and the service life of the bank slope structure can be prolonged.

The invention discloses an ammonia catalytic cracking device based on plasma assistance, which relates to the technical field of low-pressure reaction containers, and comprises a plasma high-voltage power supply, an outer cylinder, an inner cylinder, a rotating shaft and an impeller group, the front end and the rear end of the inner cylinder are respectively communicated with the air inlet and the air outlet of the outer cylinder; the front end of the rotating shaft is rotationally connected with the front end surface of the outer cylinder; an impeller group is fixedly arranged on the rotating shaft in the inner cylinder; the positive electrode of the plasma high-voltage power supply is electrically communicated with the rotating shaft and the impeller group, and the negative electrode is electrically communicated with the inner cylinder; the outer cylinder is grounded and electrically communicated with the inner cylinder. The ammonia gas is cracked and heated by high-voltage discharge, the catalyst is heated by heat generated by discharge, secondary thermal cracking of the ammonia is promoted by the catalytic action of the catalyst, the ammonia gas is efficiently cracked into an ammonia-hydrogen mixed gas for subsequent proportioning or purification, and the problem that the ammonia is difficult to apply as a fuel is solved; the device is simple and compact in structure, easy to disassemble and assemble and convenient to use and maintain.

The invention relates to a preparation method of a modified waste concrete recycled aggregate, which comprises the following steps: crushing waste concrete, screening the crushed waste concrete with a proper particle size to serve as a raw material of the recycled aggregate, washing with a shaking sieve to remove part of edges and corners about to fall off, and carrying out gelation reaction by using modified solutions such as nano silicon dioxide and water-soluble silicate to obtain the modified waste concrete recycled aggregate. According to the invention, fine pores on the surfaces of concrete particles are blocked and repaired, so that the structure is complete and compact, the mechanical strength of the aggregate is enhanced, the porosity and the water absorption rate are reduced, and the water absorption and the mechanical strength are further reduced through phenolic resin coating. The modified waste concrete recycled aggregate is mixed with cement, zeolite powder and the like, the mixture is pressed into a blank, and the artificial stone with excellent mechanical properties and low water absorption is obtained after carbonization curing. The method provided by the invention has good application prospects and environmental protection significance.