249 results about "Chemical pollution" patented technology

The invention relates to the technical field of battery pole piece recovery, in particular to a waste lithium iron phosphate battery positive pole piece physical dry recovery method which comprises the following steps: fragmenting waste lithium iron phosphate battery positive pole pieces, carrying out electromagnetic separation, and sequentially carrying out low-temperature embrittlement treatment and two-stage mechanical dissociation, a dissociation material obtained by separating the black powder, the current collector and the high-molecular binder is obtained; then, two-stage screening is adopted, fine black powder smaller than 50 micrometers is obtained through screening, the binder in the fine black powder is fused through pulse hot air and enters a hollow porous ceramic roller along with airflow, the fused binder is adsorbed to the outside of the roller through micropores of the porous ceramic roller according to the surface energy difference, and therefore the binder is removed and recycled; and finally, airflow separation is carried out, and a black powder product and current collector chippings are obtained through separation. According to the method, chemical pollution and high-temperature damage can be avoided, accurate separation of the black powder, the aluminum foil and the binder is efficiently achieved, and the purity of the black powder product is 99% or above.

The invention discloses a compact mycelium-based high-efficiency durable sound insulation composite material and a rapid preparation method thereof, and relates to the field of biological building materials.The method comprises the steps that straw powder, corncob powder, wood chip powder, bran powder, soybean meal and an alkaline mixed additive are mixed to be uniform, aerogel particles, graphene nanosheets and water are added and stirred, and a mixture is obtained; a culture medium is formed, oyster mushroom strains or ganoderma fungus strains are evenly inoculated on the culture medium at the same time in a multi-point injection mode, the injection depth is the same, then the temperature is controlled to be 30-35 DEG C, the humidity is controlled to be 65%-75%, heating is conducted in a microwave heating mode under the ventilation condition, and after mycelia completely cover the culture medium, a culture system is obtained; the culture system is subjected to compression molding under the pressure of 2-5 Mpa, then vacuum drying is performed, the total water content is controlled to be 4% or below, the compact mycelium-based efficient and durable sound insulation composite material is obtained, the production efficiency and the material performance are improved, and no chemical pollution exists.

The invention relates to the technical field of tail gas treatment, in particular to a cremation machine tail gas treatment device and method. The device comprises a cooling assembly, a low-temperature plasma assembly, a high-voltage electrostatic filtering assembly and an adsorption catalysis assembly which are communicated in sequence. Through multi-stage purification, the rich dust removal effect can be achieved, consumables only need to be replaced in the adsorption catalysis section, the adsorption catalysis section is located at the final position of the treatment link, only a small amount of residual pollutants can be treated, and the replacement period can be greatly prolonged. The method does not involve chemical agents, and does not cause chemical pollution to equipment and the surrounding environment.

The invention discloses a grinding sheet and a preparation method thereof. The grinding sheet comprises a base material; and the grinding layer is arranged on one side of the base material and comprises silicon carbide micro powder, and the side, away from the base material, of the silicon carbide micro powder is arranged in a concave-convex shape. The preparation method of the grinding sheet comprises the following steps: mixing silicon carbide micro powder, acrylic resin, isocyanate and a diluent into a mixed solution, stirring the mixed solution under the conditions of rotating speed r, ultrasonic power p and stirring time T1 to form slurry, and coating the surface of a base material with the slurry; baking the surface of the slurry at a first temperature t1 for a first baking time T2 until no viscosity exists, and rolling; and carrying out secondary baking at a second temperature t2 for a second baking time T3 to form the grinding sheet. Due to the concave-convex arrangement of the grinding sheets, the fiber height control is more stable when the ferrule is ground, and the grinding sheets are directly added with water for grinding instead of traditional grinding liquid, so that the problems of unstable fiber height control, chemical pollution and low efficiency in the traditional grinding process are solved.

The invention discloses a central air conditioner pollution degree autonomous evaluation robot based on multi-modal perception, and relates to the technical field of intelligent detection, the robot comprises a voxel space division module, a data acquisition module, a pollution characteristic mapping modeling module, a physical pollution detection module, a chemical pollution detection module and a biological pollution detection module; through three-dimensional point cloud data scanning and real-time data acquisition, the air pipe wall surface roughness, the temperature delay time, the gas fluctuation, the heat retention degree and the microbial metabolism gas concentration are monitored in real time, and a three-dimensional pollution characteristic mapping model is generated according to the pollution characteristic data set; by calculating a physical pollution index PPI, a chemical pollution index CPI and a biological pollution index BPI and comparing and analyzing with corresponding threshold values, whether dust retention, gas concentration and microorganism quantity in an air pipe exceed standards or not is judged in real time, cleaning, filtering and sterilizing strategies are automatically triggered, and the air quality and operation safety of a central air conditioning system are effectively guaranteed.

The invention discloses a lake pollution traceability analysis method based on multi-source data assimilation and reverse diffusion, and relates to water pollution traceability analys.The lake pollution traceability analysis method comprises the steps that chemical pollution is monitored at the downstream of a lake, monitoring data are imported into a hydrodynamic force-water quality model after Kalman filtering, and spatial and temporal distribution data of pollutants in a water body are obtained; pollution source inversion is carried out based on a differential evolution Markov chain Monte Carlo method, and pollution source parameters are obtained; forward simulation is carried out, a flow velocity field and water depth are solved through a hydrodynamic force-water quality model, then a pollutant transport model is generated, pollution source parameters are used as input, a finite volume method discrete control equation is used based on the pollutant transport model to predict pollutant concentration space-time evolution, and pollution duration under natural attenuation is evaluated; and comparing real-time monitoring data with an expected effect, and evaluating a pollution traceability analysis effect. Pollution source positioning errors are reduced, pollution contribution rate calculation accuracy is improved, traceability efficiency is improved, the risk of excessive reagents is avoided, and treatment cost is reduced.

The invention provides a curtain wall cleaning robot mechanical arm motion planning method and system, relates to the technical field of cleaning robot motion planning, and solves the problems of dynamic stability and accurate force application in high-altitude curtain wall cleaning by fusing multi-source sensing data and a self-adaptive control algorithm. A pollution identification model based on HSV color space weighted analysis can quantify the severity of different pollution types, and provides a reliable basis for differentiated cleaning strategies; a multi-joint dynamic wind pressure compensation mechanism is combined with wind speed change feedforward control, so that the trajectory tracking precision of the mechanical arm in a strong wind environment is improved; the closed-loop self-calibration system ensures the stability of long-term operation through real-time offset detection and parameter optimization. Therefore, balance of cleaning efficiency, curtain wall protection and energy consumption control is achieved, the system is more suitable for urban high-rise building dense areas and chemical pollution sensitive areas, and an innovative scheme is provided for reliable operation of intelligent cleaning equipment under high-altitude complex working conditions.

The invention discloses a plant cell vesicle efficient extraction method based on the synergistic effect of three-dimensional gradient micro vortex and sound wave fluidization and application of the plant cell vesicle efficient extraction method. According to the plant cell vesicle extraction method provided by the invention, high-yield, high-purity and high-activity extraction of plant cell vesicles is realized through an active enzymolysis-acoustic cracking-three-dimensional gradient separation full-chain process, and the plant cell vesicle extraction method can be used for large-scale production. The method overcomes the defects of low yield and purity, chemical pollution, low extraction efficiency, uncontrollable vesicle size, easily damaged structure, long time and the like of the traditional extraction method, and can be used for producing and preparing more cosmetics and medicines containing plant cell vesicles on a large scale. The method systematically solves the global problem of extraction and application of the plant vesicles through multidisciplinary cross innovation (acoustics, fluid mechanics and molecular bionics), is high in extraction efficiency, good in activity effect and comprehensive and advanced in technical parameters, and has important significance on extraction and development of the plant cell vesicles.

The invention belongs to the technical field of fiber reinforced composite materials, and particularly relates to a modified chopped basalt fiber and a preparation method thereof. The method comprises the following specific steps: S1, preparing a bacterial liquid: inoculating sporosarcina pasteurii into a weakly alkaline culture medium, and carrying out shaking culture to obtain the bacterial liquid; s2, preparing a mixed solution, namely mixing the bacterial solution and the nutrient solution, and standing to obtain the mixed solution; s3, preparing the modified short-cut basalt fibers: immersing the short-cut basalt fibers in the mixed solution, taking out the short-cut basalt fibers, and drying the short-cut basalt fibers to obtain the modified short-cut basalt fibers. The surface roughness of the fiber modified by the preparation process is obviously improved, and the binding force with a cement-based material is enhanced; the 28d breaking strength of the cement mortar adopting the modified fiber is maximally improved by 27%, and the compressive strength is maximally improved by 11%; the method has the advantages of no chemical pollution, simple operation, low cost, and good application prospect.

The invention relates to the technical field of biological nanomaterials, in particular to common turnip and common turnip residue hydrogel as well as a preparation method and application thereof, and the preparation method comprises the following steps: freeze-drying and grinding common turnip slices to obtain common turnip powder, mixing the common turnip powder with water, carrying out ultrasonic treatment and vacuum filtration, and freeze-drying filter residues to obtain common turnip residues; adding sodium alginate powder into the heated water bath to obtain a sodium alginate solution, and after sodium alginate is completely dissolved into homogeneous liquid, adding gelatin to obtain a sodium alginate-gelatin mixed system; after gelatin in the sodium alginate-gelatin mixed system is completely dissolved, cooling, respectively adding the common turnip powder and the common turnip residues into the sodium alginate-gelatin mixed system, and mixing to obtain a common turnip powder and common turnip residue hydrogel precursor; a Ca < 2 + > solution is added into the common turnip powder and the common turnip residue hydrogel precursor until the common turnip powder and the common turnip residue hydrogel precursor are colloidal, and the common turnip powder and the common turnip residue hydrogel are obtained, a traditional cross-linking agent is not used in the preparation method of the common turnip residue hydrogel, and chemical pollution and potential health risks are avoided.

The invention discloses a 7-aminocephalosporanic acid producing strain as well as a preparation method and application thereof. The invention provides a method for preparing 7-aminocephalosporanic acid. The method comprises the following steps: carrying out combined plasmid construction on promoters from different sources and a plurality of cephalosporin C acyltransferases; a cephalosporin C acyltransferase gene is integrated into a cephalosporium acremonium strain genome through a protoplast transformation method to obtain recombinant bacteria, and the recombinant bacteria are fermented to obtain a 7-aminocephalosporanic acid product. According to the invention, CPC high-productivity cephalosporium acremonium strain is taken as a starting strain, and cephalosporin C acyltransferase is introduced into the starting strain in an exogenous manner by means of genetic engineering, synthetic biology and the like, so that direct production of 7-aminocephalosporanic acid from the engineering strain can be realized. The method has the advantages of simple steps, no chemical pollution in the production process, and huge industrialization prospect.

The utility model belongs to the technical field of wastewater treatment, and relates to a two-stage oxidation device for sintering desulfurization and denitrification wastewater treatment. The device comprises a primary ozone treatment module, a secondary ozone treatment module, an ozone generator and an activating and dosing device. The process flow comprises two stages of primary ozone process treatment and secondary ozone process treatment. The wastewater directly reacts and indirectly reacts with ozone in sequence in the treatment process, organic waste in the wastewater is effectively and fully catalyzed and decomposed, and finally up-to-standard discharge is achieved. The device and equipment provided by the utility model are simple, do not need a complex treatment process, are easy to maintain, and are relatively low in maintenance medicament cost. The device provided by the utility model has continuity, can realize continuous water production, and does not generate secondary chemical pollution.

The invention relates to the technical field of preparation of barium sulfate powder, and discloses a preparation process of aluminum hydroxide modified barium sulfate powder, which comprises the following steps: constructing high-density sulfate radical active sites through argon plasma activation, and combining with a bio-based coupling agent to realize triple chemical bonding of barium sulfate and aluminum hydroxide; dynamically controlling hydrolysis of the aluminum salt by adopting microwave pulse in cooperation with a spiral microreactor to generate a nanoscale aluminum hydroxide uniform coating layer; supercritical CO2 is introduced to synchronously regulate and control the pH and the anti-solvent effect, side reaction is inhibited, and coating compactness is optimized; a closed-loop aluminum salt recovery system is combined to realize resource cyclic utilization; finally, the application performance of the powder is improved through hydrophobic treatment of magnesium stearate. Compared with a traditional acid pickling activation and continuous heating process, the chemical pollution risk is avoided, the bonding strength of a coating layer is improved by 60% or above, the utilization rate of aluminum salt reaches 98%, and the powder hydrophobicity and the plastic processing adaptability are remarkably optimized.

The present invention discloses a puerarin microcapsule for intestinal targeted release and its preparation method and application in the field of puerarin microcapsule embedding technology. The preparation method is as follows: using yeast β-glucan as an embedding carrier, in a solution environment, puerarin is embedded in yeast β-glucan under ultrasound to form a core material to obtain a first mixed solution; then sodium alginate powder is added to the first mixed solution under stirring to coat the surface of the core material with sodium alginate to form a layer of wall material to obtain a second mixed solution; using a sharp hole method, the second mixed solution is added dropwise to a coagulation bath for solidification, washed, and freeze-dried after solid-liquid separation to obtain puerarin microcapsules. The preparation method of the present invention is simple and easy to operate, selects medicine and food homologous substances as raw materials, does not introduce toxic and harmful chemical preparations such as cross-linking agents, avoids chemical pollution and potential health risks, and the puerarin microcapsules of the present invention have good intestinal sustained release and antioxidant properties.

The invention discloses a pig farm sand table decontamination and pollutant monitoring early warning system, and relates to the field of pig farm early warning. Comprising a multi-modal sensor array module which comprises a biological pollution detection unit, a chemical pollution detection unit and a radioactivity detection unit and is used for collecting pig house environment and multi-dimensional pollution data in the decontamination process in real time; and the digital twinborn decontamination deduction module renders a pollution diffusion cloud picture in real time, superposes virtual actions of decontamination equipment and predicts a pollutant diffusion path. According to the pig farm sand table decontamination and pollutant monitoring and early warning system, high-frequency acquisition of biological, chemical and radioactive pollution is realized through a multi-mode sensor array, multi-dimensional pollution feature vectors are generated through wavelet transformation and Kalman filtering preprocessing, pollution risk levels are output in combination with a fuzzy logic algorithm, yellow / orange / red three-level accurate early warning is realized, and the accuracy of pig farm sand table decontamination and pollutant monitoring and early warning is improved. Compared with traditional single-index early warning, the comprehensive early warning accuracy is improved, and meanwhile the missed alarm rate is reduced.

The invention discloses a laser cleaning permeable membrane device which comprises a workbench, a laser emitting mechanism, a permeable membrane moving and overturning mechanism, a feeding and discharging mechanism and a spraying auxiliary mechanism are installed at the upper end of the workbench, and the laser emitting mechanism comprises a laser emitting assembly. The permeable membrane moving and overturning mechanism can clamp, translate and overturn a permeable membrane, the feeding and discharging mechanism can be matched with the permeable membrane moving and overturning mechanism to feed and discharge the permeable membrane, the spraying auxiliary mechanism comprises a water tank and an air pump, and an electric heating plate is fixedly mounted in the water tank. The air outlet end of the air pump communicates with the interior of the water tank through a pipeline, and a spray pipe is inserted into the upper end of the water tank. By means of the structural arrangement, physical and chemical pollution of the film layer can be removed in a high-precision and all-around mode, meanwhile, controllability of the laser method is high, damage to the surface of the film is avoided, and the problem of chemical pollution existing in an existing cleaning technology is solved.

The invention discloses a copper foil production system and an ultrasonic method, and relates to the field of electrolytic copper foil preparation, the copper foil production system is used for electrolytic copper foil production, the copper foil production system comprises a cathode roller and an electrolytic bath, the electrolytic bath is used for allowing electrolyte to pass through, the cathode roller is partially arranged in the electrolytic bath, the copper foil production system further comprises an ultrasonic transducer, and the ultrasonic transducer is arranged in the electrolytic bath. The ultrasonic transducer is arranged in the electrolytic bath, and ultrasonic waves emitted by the ultrasonic transducer enable electrolyte in the electrolytic bath to vibrate so as to shred a foam layer in the electrolytic bath; through the design, chemical pollution is avoided, and the production efficiency is improved.

The utility model discloses a laser dust meter for chemical pollution detection, and relates to the technical field of chemical pollution detection. The device comprises a bottom plate, mounting frames are arranged on the two sides of the upper portion of the bottom plate, a detection cylinder is arranged between the mounting frames, a sampling assembly is arranged above the mounting frames, and a storage assembly is further arranged on the bottom plate; electric push rods in the sampling assembly are fixedly connected to the front and rear ends of the mounting rack, and piston shafts of the electric push rods are fixedly connected with a lifting plate. According to the utility model, the electric push rod and the lifting plate in the sampling assembly are used for driving the gas-collecting hood to lift, and the gas-collecting hood is used for sampling and detecting air at different heights, so that the problem that the air at different heights is inconvenient to sample and detect in the prior art is solved; a detected air sample is guided into a storage cylinder for storage through a first connecting pipe and a second connecting pipe in the storage assembly, so that the problem that the detection sample is inconvenient to store in the prior art is solved.

The utility model discloses a zinc-containing dust sludge solid waste treatment device which comprises a dosing device and a mixing and separating device, and the dosing device is arranged above the mixing and separating device and is connected with the mixing and separating device through a dosing pipeline; the chemical adding device further comprises chemical pipes and a chemical mixing box, and the chemical pipes are arranged on the two sides of the chemical mixing box for preventing chemical pollution; the mixing and separating device further comprises a stirring tank and a temporary storage device. The stirring tank which is better in stirring effect and can be automatically cleaned is arranged on the left side of the temporary storage device with the primary filtering effect and connected with the temporary storage device through a pipeline. According to the utility model, an isolation structure is added when medicaments are mixed, so that the medicament pollution is prevented, and the mixing effect is improved; the stirring mode is improved, all materials are stirred, automatic cleaning can be carried out in cooperation with medicament feeding, and the working efficiency is improved; and a caching function is added, primary separation is carried out while materials are cached, and the reliability and the working efficiency of the device are improved.

The invention discloses chemical pollution toxic wastewater pretreatment equipment, and relates to the technical field of wastewater pretreatment, the chemical pollution toxic wastewater pretreatment equipment comprises a body assembly, the body assembly comprises a pool body, a platform is fixed on the pool body, a rotating shaft is arranged on the platform, a chain wheel is fixed on the rotating shaft, a chain is meshed on the chain wheel, a follow-up block is fixed on the chain, and the follow-up block is fixed on the pool body. A slag scraping plate is arranged on one side of the follow-up block, and an arc-shaped plate is fixed in the tank body; and the cleaning assembly is arranged on one side of the slag scraping plate. The slag scraping device has the beneficial effects that the adaptive cleaning piece is additionally arranged at the slag scraping mechanism, automatic cleaning after single-time slag scraping of the slag scraping plate is achieved by combining the moving track and power of the slag scraping plate, the slag scraping efficiency is improved, the cleaning piece can automatically trigger cleaning when the slag scraping plate completes one-time slag scraping, is close to a slag stacking area and is in a horizontal state, and the slag scraping efficiency is improved. The scum attached to the surface of the scum scraping plate is scraped, the triggering time of the cleaning piece is accurately matched with the moving track of the scum scraping plate, and interference with the movement of the scum scraping plate is avoided.

The utility model discloses a kind of MEA seven-in-one stacking devices, including bottom plate and detachable positioning plate. Positioning rod is provided on bottom plate, for fixing MEA and polar plate. Detachable positioning plate is formed by two pieces of L-shaped parts transversely assembled, and is provided with the first positioning hole for positioning rod to pass through and the positioning through slot for GDL positioning. The core of the device is to integrate seven-in-one laminating process and stack process, cancel the traditional GDL dispensing link, directly fix GDL using the final stack pressure of electric pile. The design does not need special equipment such as dispensing and hot pressing, simplifies the process, improves production efficiency, and at the same time, completely solves the problem of uneven pressure distribution and chemical pollution caused by glue line, suitable for efficient and high-quality assembly of fuel cell stack.

The invention provides high-whiteness and low-isoflavone-content soybean protein isolate for infant food, and belongs to the technical field of infant complementary food. Comprising the following components in percentage by mass: 92.5%-6% of soybean protein isolate, 6.0% of maltodextrin, 0.8% of sodium carboxymethyl cellulose, 0.1% of sucralose and 0.6% of ethyl vanillin, the risk of residual chemical bleaching agents (hydrogen peroxide and sodium hypochlorite) is avoided, the content of isoflavone is reduced to be less than or equal to 10mg / kg, the hidden danger of endocrine interference is reduced, the damage of high temperature and strong acid / alkali to a protein structure is reduced, and the quality of the protein is improved. The energy consumption is reduced through low-temperature sterilization and vacuum freezing dehydration, the whiteness is greater than or equal to 85%, the sensory requirements are met, the protein content is greater than or equal to 90%, the purity is high, and the protein is suitable for being used as a high-quality protein source of infant food; the green solvent and physical / biological decoloration reduce chemical pollution, and the process is more environment-friendly.

The invention discloses a dense mycelium-based high-efficiency and durable sound-insulating composite material and a rapid preparation method thereof, relating to the field of biological building materials. The method comprises the following steps: uniformly mixing straw powder, corn cob powder, sawdust powder, bran powder, soybean meal powder and an alkaline mixed additive, adding aerogel particles, graphene nanosheets and water, and stirring to form a culture medium; simultaneously and uniformly inoculating oyster mushroom species or ganoderma fungus species on the culture medium by multi-point injection, with the injection depth being the same; then controlling the temperature to 30-35°C and the humidity to 65%-75%, heating the culture medium by microwave heating under ventilation conditions, and obtaining a culture system after the mycelium completely covers the culture medium; and pressing the culture system into shape under a pressure of 2-5 MPa, and then vacuum drying the culture system to control the total water content to below 4%, thereby obtaining a dense mycelium-based high-efficiency and durable sound-insulating composite material, thereby improving production efficiency and material performance, and avoiding chemical pollution.

The present invention relates to an LED light strip, characterized in that it comprises: a flat enameled wire and a metal foil strip; the metal foil strip is wound or bonded on the flat enameled wire, a metal core is exposed at an opening in the flat enameled wire, one electrode of the LED is welded to the opening of the enameled wire, and the other electrode is welded to the metal foil strip. The LED light strip is used as a warp and woven into a mesh with conductive filaments, the woven mesh is used as a heat sink for the LED light strip, the intersections of the conductive filaments and the LED light strip are welded, and the intersections between the conductive filaments are welded. The LED light strip and the circuit network with self-formed conductive paths disclosed by the present invention have simple processing technology, no chemical pollution, and much higher heat dissipation performance than existing LED light strips.

The present invention relates to the field of pesticides and chemical technologies, and specifically discloses a method for preparing a pesticide derived from a fungus ( Hypoxylon fragiforme Trinitropropionic acid derivatives with termite control activity, their preparation methods, and applications. Experimental studies have demonstrated that at a concentration of 100 μmol / L, the trinitropropionic acid derivatives of the present invention have a termite antifeedant rate of 92.31% and a termite mortality rate of 45.53%. The trinitropropionic acid derivatives of the present invention are obtained through extraction and purification from fungal fermentation. The entire production process is chemically pollution-free and environmentally friendly, demonstrating their potential use as novel green pesticides.

The invention belongs to the technical field of cellulose preparation, and particularly relates to micro / nano cellulose based on high-shear intramolecular friction dissociation and a preparation method thereof, and the preparation method comprises the following steps: (1) crushing a cellulose raw material; (2) adding the crushed cellulose into a dilute acid solution at a preset temperature, and dissociating under the action of double-helix high-pressure homogenization to obtain a micro / nano cellulose acidic dissociation liquid; and (3) repeatedly centrifuging the micro / nano cellulose acidic dissociation liquid with deionized water until the micro / nano cellulose acidic dissociation liquid is neutral, and freeze-drying to obtain the micro / nano cellulose. According to the method, multi-selectivity natural cellulose is taken as a raw material, and the long-standing triangular problems of uneven size, overhigh energy consumption and chemical pollution in micro / nano cellulose production are solved through directional utilization of intramolecular friction energy by a double-helix high-pressure homogenization method.

The conventional wooden pallets are making de-forestation, lower sustainability, prone to absorb bacteria,chemical contamination & splinters and damage. The wooden pallet required ISPM no.15 (International Standard for Phytosanitary Measures no.15 for the regulation of food packaging material. The roto-molded plastic pallets are cannot be easily repaired when damaged. Plastic pallets are more expensive than wooden pallets. Plastic pallets contribute to increase the carbon footprint. Etruded Plastic Sand pallets are durable, repairable, exempted from ISPM no.15. The present invention consists of two elements stiffener(2) and rib(3) gluing together to make a pallet. Etruded pallet do not required any mechanical fastners.

The invention provides a method for purifying mesona chinensis benth polysaccharide based on membrane separation and application thereof, and relates to the technical field of mesona chinensis benth polysaccharide purification. The method for purifying mesona chinensis benth polysaccharide based on membrane separation comprises the following steps: carrying out pressure filtration on a mesona chinensis benth extracting solution by using a ceramic membrane with the aperture of 750-850 nm, a tubular membrane with the aperture of 200-300 KD and an ultrafiltration membrane with the aperture of 50-150 Da in sequence to obtain a concentrated solution, and drying the concentrated solution. According to the method disclosed by the invention, membranes with different aperture specifications are used for separation, the functions of deproteinization, small molecule impurity removal, concentration and dialysis are realized in a single system, finally, a high-concentration concentrated solution is directly obtained, and the process stability is improved. In addition, the preparation method is short in time consumption, high in separation efficiency, free of chemical pollution and low in energy consumption, and the polysaccharide recovery rate can reach 88.5% through a membrane separation system.

An optical fiber grinding coated abrasive tool and a preparation method thereof. The present application discloses an optical fiber grinding coated abrasive tool and a preparation method thereof, and belongs to the field of grinding materials. The present application aims to solve the problems of PIN hole residual pollution and cleaning difficulty caused by the use of grinding fluid containing chemical additives in traditional grinding process. The abrasive tool adopts an innovative double-layer coating structure: the bottom layer is a porous elastic layer with liquid storage function, and the surface layer is a mud crack structure abrasive layer with controllable consumption. Only water or grinding oil is needed during grinding, and the surface layer can gradually fall off to form fresh grinding slurry, realizing the effective replacement of liquid grinding medium by solid abrasive tool. This technical scheme avoids chemical pollution, simplifies the operation process, and can stably obtain high-precision optical fiber end faces, especially suitable for precise grinding of MPO multi-core fiber connectors.

The invention relates to the field of bamboo veneer processing, in particular to a method for widening a large-breadth flattened sliced bamboo veneer, which comprises the following steps of: compounding the sliced bamboo veneer with gauze or non-woven fabric by hot pressing; edge cutting and width fixing are conducted on the compounded sliced bamboo veneers; glue is smeared in the thickness direction of the sliced bamboo veneers; the sliced bamboo veneers are placed in an environment of 30-50 DEG C, and glue is dried; the dried sliced bamboo veneers are placed in a board splicing machine for pre-splicing; and hot-pressing and compounding the sliced bamboo veneer and the gauze or the non-woven fabric again to obtain a finished product. The formaldehyde-free environment-friendly adhesive is adopted, so that chemical pollution is reduced; the side face of the sliced bamboo veneer is pre-spliced and combined with gauze / non-woven fabric, multiple times of gum dipping is avoided, and gum consumption can be reduced; continuous veneers with the width of 2-10 m or above can be prepared, cloth-shaped veneering materials are achieved and directly used for wall decoration, and machining links can be reduced; the cut bamboo wood is suitable for household products such as stationery bags and computer supports, and the application dimension of the bamboo wood can be expanded.