216results about How to "No emissions" patented technology

The invention belongs to the technical field of recoverable epoxy resin, and relates to a degradable epoxy resin system material and application thereof, a body, a composite material and a recovery method thereof. The degradable epoxy resin system material comprises a first component and a second component, the first component comprises first epoxy resin and second epoxy resin, and the second component comprises a first curing agent, a second curing agent and an accelerant; the first epoxy resin is a mixture of one or more of glycidyl ether epoxy resin and glycidyl amine epoxy resin and accounts for 15-35% of the first component by mass, the second epoxy resin is selected from one or more of epoxy resin with the structure containing # imgabs0 #, and the second epoxy resin accounts for 60-80% of the first component by mass; the first curing agent is one or a mixture of more of alicyclic amines and accounts for 40%-60% of the second component by mass, the second curing agent is one or a mixture of more of polyether amines and accounts for 40%-60% of the second component by mass, and the accelerant accounts for 0.5%-3% of the second component by mass. The requirement for vacuum infusion of the wind power blade can be met.

The invention discloses multifunctional acetylene carbon black as well as a preparation method and application thereof. The preparation method comprises the following steps: blending triethylenetetramine hexaacetic acid and acetylene carbon black in a mass ratio of (0.05-0.5): 100, and then carrying out esterification reaction under a vacuum condition, thereby obtaining the multifunctional acetylene carbon black. The preparation method comprises the following steps: modifying acetylene carbon black by adopting triethylenetetramine hexaacetic acid, and carrying out esterification reaction on triethylenetetramine hexaacetic acid with six carboxyl functional groups and acetylene carbon black with a hydroxyl functional group, so that the acetylene carbon black is modified, and the acetylene carbon black becomes multifunctional acetylene carbon black. The acetylene carbon black modified with a large number of carboxyl groups and amide groups on the semiconductive wrapping tape form rich hydrogen bonds, so that the compatibility of the acetylene carbon black and the semiconductive wrapping tape is improved.

The invention relates to the field of oilfield chemical drilling fluid treatment agents, and discloses a chitosan grafted copolymer, a preparation method thereof and a drilling fluid, the chitosan grafted copolymer has a structure as shown in formula (I), and the number-average molecular weight is 200000-600000; m is 1200 to 3500, and X and Z are respectively and independently H or-R1COOM1 or a polymeric chain segment; wherein R1 is alkylene of C1-C5, and M1 is H, Na or K; the polymeric chain segment contains a structural unit A and a structural unit B, the structural unit A contains at least two-COOM2, M2 is H, Na or K, and the structural unit B contains a cyclic lactam structure; y is H or a quaternary ammonium salt structure with an ester group. The chitosan grafted copolymer provided by the invention has relatively good wall fixing performance and filtrate loss reduction performance, and ensures well wall stability of easy-to-collapse stratum of shale fracture zone from two aspects of wall fixing and filtrate invasion reduction, # imgabs0 #

The invention relates to an electrolytic fluorine-making nickel-containing waste electrolyte treatment method which comprises the following steps: heating a fluorine-making electrolytic cell to 80-95 DEG C, completely melting the electrolyte, standing for layering, and taking out the colorless electrolyte on the upper layer; excessive fluorine gas is introduced into the electrolytic cell, and ferrous ions in the remaining electrolyte are converted into iron ions; electrolyte in the electrolytic bath is guided into an anti-corrosion container, deionized water is added into the anti-corrosion container, and the electrolyte is completely dissolved; adjusting the pH value of the solution in the container to 3-4, fully precipitating, and carrying out solid-liquid separation to obtain a solid A and a filtrate A; adjusting the pH value of the filtrate A to 9-11, fully precipitating, and carrying out solid-liquid separation to obtain a solid B and a filtrate B; and adjusting the ion molar ratio of F <-> to K < + > in the filtrate B to be 2: 1, then carrying out evaporative crystallization, and drying obtained crystals to obtain products of potassium hydrogen difluoride and potassium fluoride. The waste electrolyte can be effectively treated, and resources are efficiently recycled and reutilized.

The invention provides a hydrogen-ammonia mixed low-nitrogen combustor, and belongs to the technical field of combustors. The technical problem of gas combustion with hydrogen and ammonia serving as fuel at present is solved, and the problems that due to the fact that the ammonia combustion reaction activity is poor, the hydrogen combustion speed is high, a nozzle is burnt by tempering, and the NOx emission concentration is high are solved. The device comprises a hydrogen introduction pipe, an ammonia gas introduction pipe, a fuel gas mixer, an annular header, ammonia gas branch pipes and ammonia gas nozzles. The hydrogen introducing pipe comprises a central hydrogen pipe and a combustion-supporting hydrogen pipe, the outlet end of the central hydrogen pipe is located in the annular collecting box, the input end of the combustion-supporting hydrogen pipe is connected with the central hydrogen pipe, the output end of the combustion-supporting hydrogen pipe is connected with the fuel gas mixer, and the output end of the ammonia introducing pipe is connected with the fuel gas mixer; the output end of the gas mixer is connected with an annular header, the annular header is connected with a plurality of ammonia branch pipes, the ammonia branch pipes are annularly arranged, and ammonia nozzles are arranged at the outlet ends of the ammonia branch pipes. The device is mainly used for hydrogen-ammonia mixed combustion.

The invention relates to the technical field of hygroscopic materials, and particularly discloses an atmospheric hygroscopic material for ecological restoration of arid-semi-arid regions and a preparation method of the atmospheric hygroscopic material. The method comprises the following steps: firstly preparing gel containing a heat-conducting material, acrylamide and isopropyl acrylamide, freeze-drying the swelled gel, soaking the gel in a moisture-absorbing salt water solution to load moisture-absorbing salt, taking out and drying. The temperature sensitivity of isopropylacrylamide is retained through copolymerization of acrylamide and isopropylacrylamide monomers, meanwhile, higher hydrophilic performance is given to isopropylacrylamide, a high-molecular polymer can absorb liquid drops formed by deliquescence of moisture absorption salt, continuous adsorption of the moisture absorption salt is kept, and the polymerized gel has higher moisture absorption capacity and water yield. The prepared atmospheric hygroscopic material provides a new way for supplying water required by ecological restoration plants in arid-semi-arid regions, water vapor is collected without depending on an external device in use, and the water production process is free of energy consumption and emission and environmentally friendly.

The invention provides a yellow long-afterglow ceramic low-temperature overglaze color pigment as well as a preparation method and application thereof, and belongs to the technical field of ceramic pigments. Noctilucent powder SrAl2O4: Eu < 2 + > and Dy < 3 + > and fluorescent powder Y3Al5O12: Ce < 3 + > or Y3Al5O12: Ce < 3 + > and Gd < 3 + > are combined according to different proportions to form a yellow long-afterglow luminescent pigment, then the yellow long-afterglow luminescent pigment is mixed with a glaze surface combination auxiliary agent, and the low-temperature overglaze color pigment with yellow long-afterglow emission is obtained by utilizing a new principle and technology of energy transfer and reflection-compensation, can be fired on a glaze surface at a relatively low temperature, and has the characteristics of long-afterglow emission and long-afterglow emission. Bright yellow body color is displayed under sunlight or an artificial light source; in the dark, afterglow emission which is adjustable from yellow green to yellow is shown. The yellow long-afterglow ceramic low-temperature overglaze color pigment provided by the invention can improve the unique decorative effect of porcelain, enrich the color of the porcelain and improve the added value of ceramic products, and is a novel luminous pigment with excellent performance.

The invention discloses an integrated electric control permanent magnet motor integrated electric bamboo raft propeller which comprises a control handle, a rack operating lever, a rack, a propeller, a fan lower support, a fan, a fan upper support, a control box upper cover, a control box base, a motor, a ship networking module, a controller, a control box sealing gasket and an integrated display screen. The front end of the support is connected with an operating rod, the front end of the operating rod is provided with a control handle, the tail portion of the support is connected with a propeller, the support is provided with a motor, the front end of the motor is provided with a fan through a fan lower support and a fan upper support, and the motor is provided with a control box composed of a control box upper cover, a control box base and a control box sealing gasket. A ship networking module and a controller are arranged in the control box, and an integrated display screen is further arranged on the control box. The motor, the controller, the Internet of Things and other components are integrally designed, connection and wiring between the components are reduced, and the reliability and compactness of the system are improved. Meanwhile, installation and maintenance are convenient.

The invention relates to the technical field of dehydration and regeneration methods of water-containing ethylene glycol rich liquor, in particular to an ethylene glycol dehydration and regeneration process and device adopting azeotropic distillation, in the ethylene glycol dehydration and regeneration process adopting azeotropic distillation, fuel gas is adopted as an entrainer of ethylene glycol rich liquor water, so that the boiling point of azeotrope in an ethylene glycol reboiler is reduced. Compared with an existing conventional ethylene glycol rich solution distillation regeneration process, under the condition that the same ethylene glycol barren solution regeneration concentration is achieved, the regeneration temperature is reduced by at least 30 DEG C, heating through a low-frequency electromagnetic heater can be achieved, and heating is safer and more reliable compared with heating through a traditional resistance heater; the regeneration energy consumption is reduced by about 10%, no regeneration tail gas is discharged, the VOCs discharge amount is zero, and the method has the advantage of environmental protection.

The invention relates to the technical field of zinc powder manufacturing equipment, and particularly discloses a continuous production inert zinc powder atomization preparation device which comprises an atomization furnace, the bottom of the atomization furnace fixedly communicates with communicating pipes, and the two communicating pipes are connected with a large grading system and a small grading system correspondingly. Wherein one ends, far away from the atomizing furnace, of the large grading system and the small grading system are fixedly communicated with a balance tank. Molten zinc can be preliminarily refined when passing through the flow guide holes under the action of pressure intensity, finally enters the polymerization groove in the polymerization base and is differentiated again through the flow diffusion holes communicated with the polymerization groove, the molten zinc can be differentiated into trickles in a multi-stage mode through the multi-stage differentiation mechanism, the trickles can be more evenly distributed in the atomization chamber, and therefore the atomization effect is improved. By means of the technical scheme, the contact area between atomized gas and the liquid zinc is larger and more uniform, the situation that local liquid zinc is too much or too little is avoided, it is ensured that each part of liquid zinc can be fully and stably atomized, zinc powder with more uniform particle size is produced, and the product quality is improved.

The invention discloses a closed drying and fresh air fermentation combined type cow dung treatment system, the cow dung treatment system comprises cow dung drying equipment and cow dung fermentation equipment, the cow dung drying equipment dries cow dung through hot air drying, and wet and hot air in the cow dung drying equipment circulates through a closed drying system; the closed drying system comprises a dust removal device, a heat exchange device and a heat pump device; the heat exchange device is further connected with a fresh air circulation system. The fresh air circulation system comprises a fresh air supply device, a return air adjusting device and an exhaust air adjusting device. The cow dung fermentation equipment is used for fermenting cow dung by using the fresh air treated by the fresh air circulation system. According to the cow dung treatment system, energy of all parts is fully utilized, and energy input and consumption are reduced to the maximum extent. The cow dung treated by the system is used as bedding for the cow in bed, so that the mastitis morbidity of the cow can be effectively reduced, and the milk yield of the cow is improved.

The invention discloses an energy system based on green carbon cycle and an operation method and a control method thereof, and the energy system based on green carbon cycle comprises a methanol energy supply module, a methanol regeneration module and a carbon dioxide heat pump energy storage module; the methanol energy supply module comprises a methanol internal combustion engine and a first power generator, and the methanol regeneration module comprises a carbon dioxide capture treatment unit, a methanol synthesis unit and an electrolyzed water unit; according to the system, the park energy system with the methanol internal combustion engine as the core is adopted, the transportation cost and the storage risk of fuel are reduced on the basis of considering environmental protection, low carbon and flexible and reliable energy supply, supercritical carbon dioxide is introduced to serve as a circulating working medium, the advantages of high energy density and low viscosity of the supercritical carbon dioxide are fully explored, and the energy efficiency is improved. The heat exchange efficiency is remarkably improved, meanwhile, the size of the heat exchanger is reduced, flowing noise is lowered, the heat exchanger is more suitable for energy supply of a user side, and a new choice is provided for planning and configuration of a park energy system.

The invention discloses a low-value plant fiber material recombined fireproof door core and a preparation method thereof, and relates to the field of fireproof materials. Comprising a plurality of veneers which are laminated and compounded, inorganic flame-retardant adhesive layers are arranged between every two adjacent veneers and on the surface of the veneer located on the outer side, and each inorganic flame-retardant adhesive layer comprises trisodium phosphate, a magnesium chloride solution, starch glue, boric acid, magnesium oxide, silicon dioxide, tartaric acid and an emulsifier. According to the fireproof door core, the inorganic flame-retardant adhesive and the veneers are subjected to multi-layer cross compounding, the heat-insulating fireproof layers are formed between the boards, and the surface inorganic flame-retardant adhesive layers can effectively prevent flame from directly burning the fiber veneers, so that the fireproof door core reaches a relatively high fireproof grade, the door core has high impact resistance and deformation resistance, the fiber materials are low-carbon and environment-friendly, and the fireproof door core is suitable for being popularized and used. The material has the advantages of light density, excellent sound insulation and heat insulation effects, no emission of harmful substances or harmful gases in the manufacturing process, and conformity to national industrial policies.

The invention discloses solvent-free polyurethane resin for automobile leather and a preparation method and application thereof, and relates to resin for coating parts and seats in the fields of automobiles and the like, the resin comprises a component A and a component B. The component A is prepared from long-chain alkyl modified organic silicon polyether glycol, polyether glycol, polyether triol, a chain extender, a catalyst and a flame retardant, and the component B is prepared from a component C and a component B. The component C is prepared from long-chain alkyl modified organic silicon polyether glycol, polyether glycol, polyether triol, a chain extender, a catalyst and a flame retardant. The component B is prepared from organic silicon modified polyether glycol, polyether triol and diisocyanate; the component A and the component B are mixed according to the weight ratio of (100: 60)-(100: 80) to obtain the resin. The resin overcomes the defects in the aspects of coating performance, thermal tensile property, curing performance and the like of automobile leather, and has good peel strength, cold resistance, hydrolysis resistance and high temperature resistance.

The invention provides an efficient and recyclable electro-adsorption method for removing perfluorinated compounds in water and an electrode material by taking the most widely distributed perfluorinated butanesulfonic acid in the perfluorinated compounds as a target. Chitosan and magnetic nano ferroferric oxide are selected as raw materials for modifying activated carbon to prepare a nano Fe3O4 / chitosan / activated carbon composite electrode, the nano Fe3O4 / chitosan / activated carbon composite electrode is used as an anode, activated carbon is used as a cathode, 0.8-5V working voltage is applied, and the composite electrode is used for electro-adsorption and desorption of perfluorinated compounds in water. Therefore, on-line adsorption, desorption and concentration of the perfluorinated compounds are realized, and the purposes of controllable and efficient removal, enrichment and recovery of the perfluorinated compounds are achieved.

The invention relates to the technical field of extraction of lithium, rubidium and cesium, and discloses a comprehensive efficient high-purity extraction process of lithium, rubidium and cesium, lithium, rubidium and cesium are prepared from lithium precipitation mother liquor in a large scale by adopting a centrifugal solvent extraction method, and finally a lithium salt product with the lithium purity of 99.5% or above, a rubidium salt product with the rubidium purity of 80% or above and a rubidium salt product with the cesium purity of 92% or above are obtained. The concentration of Li in the raffinate can be reduced to below 5mg / l, the concentration of Li in the strip liquor can be more than 20g / l, the concentration of Cs in the strip liquor can be more than 18g / l, and the concentration of Rb in the strip liquor can be more than 18g / l. The whole process route is high in automation degree, large in yield, free of waste gas, waste residue and waste liquid discharge and good in system stability.

The application relates to the technical field of catalysts, and discloses a limited type iodine-based homogeneous immobilized catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and iodine ions, magnesium ions and quaternary ammonium ions loaded on the carrier, wherein the molar ratio of the magnesium ions, the quaternary ammonium ions, the iodine ions and the carrier is 0.01-1:4-15:1-30:1. The limited type iodine-based homogeneous immobilized catalyst disclosed by the application enhances the electrostatic interaction between iodine ions and quaternary ammonium ions through the molecular sieve limiting effect to construct a limited type structure. The catalyst has significantly enhanced CO2 adsorption and activation capacity, can activate an epoxide compound, and accelerates the ring opening of the epoxide compound. In a cycloaddition reaction catalyzed by the catalyst under the conditions of no solvent and no auxiliary agent, the conversion rate of propylene oxide can reach more than 73%, and the propylene carbonate selectivity can reach more than 85%.

The present application relates to the technical field of ammonia compound preparation, in particular to a method for preparing ammonium sulfate and co-producing sodium bicarbonate by using sodium sulfate, comprising the following steps: mixing industrial-grade liquid ammonia with deionized water to prepare ammonia water with a free ammonia concentration of 60-120 ti (ti is the abbreviation of titer, which is 1 / 20 mol / L), controlling the temperature of the mixing process to be less than or equal to 40 DEG C to avoid ammonia volatilization, pre-carbonizing by passing in CO2 under the conditions of 20-70 DEG C and a carbon dioxide pressure of 0.1-0.6 MPa, and adding sodium sulfate or a mixture of sodium bicarbonate and mirabilite to obtain a pre-carbonized liquid. The present application adopts an integrated process of pre-carbonization, clarification, carbonization, ammonia separation and low-temperature crystallization, and ammonia evaporation circulation, and can be operated continuously or intermittently, has low industrial implementation difficulty, strong running stability, separates ammonium sulfate by using ammonia separation and low-temperature crystallization technology, replaces the traditional evaporation and concentration process, combines material recycling design, and reduces the energy consumption per unit product compared with the traditional process.

The application relates to the technical field of catalysts, and discloses a nano magnesium oxide material and a preparation method and application thereof. The nano magnesium oxide material has a porous structure, wherein the particle size of the nano magnesium oxide is 20-200 nm; and the pore size of the porous structure is 5-45 nm. The classical nucleation growth process of the magnesium oxide is directionally adjusted in a weak alkaline nucleation system, and then the nano magnesium oxide with a controllable grain size distribution is obtained. The nano magnesium oxide material has good catalytic activity in the synthesis of propylene carbonate from CO2 and an epoxide under the conditions of no solvent and no auxiliary agent, and the catalyst is not deactivated after multiple uses, and has good stability.

The application discloses a green and efficient regeneration method of activated carbon in a brine acidification-activated carbon adsorption deodorization process, and is characterized by comprising the following steps: S1, water washing and salt removal through aeration; S2, ozone oxidation regeneration: adding an alkali liquor with the same volume as the activated carbon into an activated carbon adsorption tower, and then blowing ozone into the bottom of the activated carbon adsorption tower, so that the ozone is subjected to oxidation reaction with the activated carbon under the alkaline condition, and then waste alkali liquor is discharged; S3, water washing and alkali removal through aeration; S4, waste liquid reuse; and S5, waste material reuse. The application can not only avoid the loss of activated carbon caused by high-temperature burning, but also has short regeneration time of the activated carbon and no harmful substance residue, and is very suitable for the regeneration of the activated carbon in the acidification brine activated carbon adsorption deodorization process. In addition, the waste liquid and the waste material in the regeneration process of the activated carbon can be reused, the whole process is free of toxic and harmful waste emission, is green and environment-friendly, has low treatment cost, high efficiency, good economy, environmental protection and feasibility.

The invention relates to the technical field of metal surface treatment, in particular to a coating precursor composition, a metal coating and a preparation method and application of the coating precursor composition and the metal coating. The nano additive comprises a combination of nano silicon dioxide, nano aluminum oxide, nano magnesium oxide and nano titanium dioxide. The coating precursor composition provided by the invention comprises the silane coupling agent and the nano additive, and the metal coating prepared from the coating precursor composition has the excellent properties of high temperature resistance, difficulty in stripping, high hardness, no color, transparency and the like, can effectively resist erosion and wear of an external environment, and effectively prolongs the service life of metal.

The present invention discloses a sludge feeding device, comprising: a sludge pushing power device, used to receive sludge and transport it to an incinerator through a sludge pushing channel; a variable diameter sludge discharging device, used to receive the sludge output from the sludge pushing power device, and increase or decrease the sludge passing capacity entering the incinerator; an isolation pushing device, which pushes the sludge coming out of the variable diameter sludge discharging device into the incinerator; an auxiliary unblocking device, used to clear the blocked channel; a coordination control system, used to control the sludge pushing power device, the variable diameter sludge discharging device, the isolation pushing device and the unblocking device to coordinately send the sludge into the incinerator. The present invention sends the sludge that has undergone preliminary pressure filtration into the boiler, so that the sludge is not dried, has no odor diffusion, does not affect the surrounding environment, and can be controlled to enter the furnace for incineration in real time.

The invention discloses a porous microstructure foaming white cement radiation refrigeration composite material and a preparation method thereof, and belongs to the technical field of building energy-saving materials.According to the material, sulphoaluminate white cement serves as a base material, a foaming agent is added, and evenly-distributed porous microstructures are formed in the preparation process; by utilizing the synergistic effect of the high reflection characteristic of the sulphoaluminate white cement and the enhanced scattering and heat insulation performance of the porous microstructure, the efficient radiation refrigeration function is realized; the problems that a traditional white cement material is low in radiation refrigeration efficiency and insufficient in heat insulation performance are solved, the preparation process is simple, the cost is controllable, the material can be widely applied to building exterior walls, roofs and other building envelopes, and remarkable energy-saving benefits and market application prospects are achieved.

The invention relates to a power grid frequency modulation and peak regulation method and device based on gravity energy storage, and a medium. The method comprises the following steps: training an ARIMA model and an LSTM model by using historical load data of a power grid and historical compensated electric energy; monitoring a load state of a power grid according to a real-time load monitoring module, and predicting electric energy needing to be compensated by using an ARIMA model and an LSTM model according to the load state; according to the electric energy which is predicted by the ARIMA model or the LSTM model and needs to be compensated and the multiple linear regression model, an environment correction coefficient is obtained, a control signal that the height of the heavy object needs to be adjusted is obtained, and according to the control signal and real-time feedback of the real-time load monitoring module, the electric lifting device is controlled to adjust the height of the heavy object; the weight is released, and potential energy generated in the weight falling process is converted into electric energy through an energy conversion device; and the generated electric energy is transmitted to the power grid through the power transmission device to realize peak regulation and frequency modulation of the power grid.

The magnetomotive force strengthening device comprises fixing frames, an output shaft, a rotor, an outer stator, a bearing, a machine shell and a machine cover, the machine cover is installed at one end of the machine shell, at least one fixing frame is fixed in the machine shell, the two ends of the output shaft penetrate through the fixing frames and the machine cover, the bearing is installed between the output shaft and the fixing frames, the rotor is installed in the machine shell and fixed to the output shaft, and the outer stator is installed on the machine cover. A plurality of outer stator magnetic units and a plurality of rotor magnetic units are respectively and uniformly embedded on the opposite circumferential surfaces of the outer stator and the rotor, the support is sleeved on the output shaft, the lower end of the support is fixed on the fixing frame through a screw, the inner stator is fixed on the outer circumference of the support through a positioning key, and the inner stator is fixed on the outer circumference of the support through a screw. An inner stator magnetic unit is embedded on the outer circumference of the inner stator, the inner stator magnetic unit is opposite to the rotor magnetic unit, a circular ring is arranged on the outer circumference of the rotor, a plurality of rotor magnetic units are uniformly embedded on the circumference of the circular ring, the outer side of each rotor magnetic unit is opposite to the outer stator magnetic unit, and the inner side of each rotor magnetic unit is opposite to the inner stator magnetic unit.

The invention belongs to the technical field of agricultural nano materials, and particularly relates to a metal-loaded phosphorus-doped carbon quantum dot as well as a preparation method and application thereof. The preparation method provided by the invention comprises the following steps: mixing citric acid, a phytic acid aqueous solution, an amine substance, water and soluble metal salt, and carrying out chelation adsorption to obtain a polymer quantum dot mixed solution containing metal ions; and carrying out hydrothermal reaction on the polymer quantum dot mixed solution to obtain the metal-loaded phosphorus-doped carbon quantum dots. The metal-loaded phosphorus-doped carbon quantum dots obtained by the preparation method provided by the invention are high in metal loading capacity, high in coordination stability, excellent in stability in soil with different pH values, and environment-friendly.

The invention relates to the technical field of aerogel, and provides a super-hydrophobic flexible aerogel heat insulation film as well as a preparation method and application thereof. The aerogel film comprises aerogel particles subjected to hydrophobic modification treatment and an in-situ fiberized fiber binder, the aerogel particles subjected to hydrophobic modification treatment are wound and anchored by a three-dimensional network structure formed by the in-situ fiberized fiber binder. The aerogel particles subjected to hydrophobic modification treatment and the fiber binder are used as raw materials, a specific process is adopted for processing, a fiber three-dimensional network anchored aerogel particle composite structure is constructed, the problem of aerogel brittleness and the process problem of uniform fibrosis of the fiber binder are solved, and the fiber three-dimensional network anchored aerogel particle composite structure is obtained. The preparation of the aerogel film with excellent comprehensive performance is realized.

This invention discloses a permeable high-strength sidewalk paving slab based on coal gangue. The paving slab is made from the following raw materials in parts by weight: 80-95 parts coal gangue aggregate and 5-20 parts polyurethane adhesive. The particle size of the coal gangue aggregate is 5mm-20mm, of which the weight percentage of particles smaller than 10mm is 30%-50%. Furthermore, this invention also discloses a method for preparing the sidewalk paving slab, which involves crushing, screening, washing, and drying the coal gangue, then loading it into a mold, vibrating to compact it, spraying with polyurethane adhesive, curing at room temperature, and then demolding. The coal gangue-based permeable high-strength sidewalk paving slab of this invention requires no sintering, has a simple process, is low-carbon and environmentally friendly, has a compressive strength of not less than 30MPa, a flexural strength of not less than 5MPa, and a porosity of 15%-25%. It combines high strength and high permeability, can absorb large quantities of coal gangue solid waste, and is suitable for municipal roads, squares, and landscape paving, offering good economic and environmental benefits.

The invention discloses a method for fixing a metal organic framework material Zn-BDC on the surface of a substrate material under the assistance of polytannic acid, which comprises the following steps: step 1, at room temperature, firstly soaking a clean substrate material in a weakly alkaline tannic acid aqueous solution, and then sequentially cleaning and drying to obtain a substrate material with the surface modified with a polytannic acid coating; 2, the substrate material with the surface modified with the polytannic acid coating is soaked in a zinc acetate solution, then cleaned and dried in sequence, then soaked in a 1, 4-sodium terephthalate solution, and then cleaned and dried in sequence; and step 3, repeating the step 2 for multiple times to obtain the substrate material modified by the metal organic framework material Zn-BDC. The method is easy to operate and environmentally friendly, Zn-BDC can be stably fixed to the surface of the substrate material, and the substrate material is endowed with good antibacterial and hemostatic performance.

The invention discloses a method for recovering silver from silver-containing waste catalysts. The method comprises the following steps: loading the silver-containing waste catalysts into a multi-stage series leaching column, adding a nitric acid solution to the top of the first-stage leaching column for leaching, and flowing out from the bottom of the last-stage leaching column, collecting the flowing silver nitrate leaching solution in sections, returning the silver nitrate leaching solution with a lower concentration to the first-stage leaching column for cyclic leaching, and obtaining metallic silver through precipitation and reduction of the silver nitrate leaching solution with a higher concentration; when the leaching of the silver-containing waste catalyst in the first-stage leaching column is completed, removing the first-stage leaching column and loading a new silver-containing waste catalyst, connecting the first-stage leaching column to the bottom of the last-stage leaching column as a new last-stage leaching column, and the second-stage leaching column as a new first-stage leaching column, and so on. The method has a short silver recovery process for silver-containing waste catalysts, low cost, and a silver recovery rate greater than 99.8%, and a silver ingot purity of ≥99.95%.