88results about How to "Uniform particles" patented technology

The invention provides a preparation method of silver-coated copper powder, and relates to the technical field of metal materials, the preparation method comprises the following steps: simultaneously dropwise adding a first silver-ammonia solution and a first reducing agent solution into a dispersion liquid of deoiled and activated spherical copper powder, reacting for 5-20 minutes after dropwise adding is finished, then simultaneously dropwise adding a second silver-ammonia solution and a second reducing agent solution, and reacting for 5-20 minutes after the reaction is finished; and reacting for 25-40 minutes, filtering, washing with water, and drying to obtain the silver-coated copper powder. The concentration of the first silver-ammonia solution is higher than that of the second silver-ammonia solution. The silver-coated copper powder obtained through the preparation method is good in particle regularity and size uniformity, few in agglomeration phenomenon, good in oxidation resistance and low in resistivity.

The invention relates to a high-entropy iron-manganese-based transition metal layered oxide positive electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion batteries, and the preparation method comprises the following steps: dissolving an iron source, a copper source, a manganese source and a nickel source in an aqueous solution of ethanol and ethylene glycol to form a first solution; dissolving a precipitator in an aqueous solution of methanol and ethanol to form a second solution; heating a methanol solution in an oil bath, dropwise adding the first solution and the second solution, introducing Ar and H2, adjusting the pH value of the solution, reacting, standing and aging, carrying out solid-liquid separation, washing and drying a product, fully mixing and grinding the product with a sodium supplementing agent, titanium dioxide and an organic solvent, heating in Ar and N2, cooling and rapidly grinding to obtain the positive electrode material. The method is simple in process, good in controllability, cheap in raw material and wide in raw material source, the prepared material is uniform in particle size, uniform in distribution and high in crystallinity, the electronic and ionic conductivity of the material is improved, high reversible capacity and excellent cycling stability are obtained, the cost is reduced, and meanwhile the electrochemical performance of the material is improved.

The invention relates to the technical field of soil detection, and provides a soil information acquisition device and method for fertilization control, the soil information acquisition device comprises an acquisition vehicle, a soil drilling mechanism, a driving module, a soil acquisition part, a rotating part, a sample containing box and a lifting part, the soil drilling mechanism comprises a first driving piece, a rotating shaft, a center frame, an arc-shaped shell, a filter screen and a drill bit; the inner wall of the arc-shaped shell is fixedly connected with a filter screen, the filter screen is used for dividing the arc-shaped shell into a first cavity and a second cavity, the driving module comprises a driving part, a transmission rod and an adjusting part, the soil collecting part comprises a first sleeve, an L-shaped block and a first key groove, and the rotating part comprises a second sleeve, a storage plate, a partition plate and a second key groove. According to the device, soil with small granularity can automatically enter the sample containing box below through the filter screen, weeds or large-particle soil can be automatically moved out of the outer side of the arc-shaped shell, the sample containing box can be automatically moved to the outer side of the arc-shaped shell, and the device has the advantages of being uniform in sample particle, high in purity and convenient to sample.

The invention discloses a mixing and discharging device for plastic product particle batching, and relates to the technical field of plastic products, the mixing and discharging device comprises a processing box, a feeding port is arranged above the processing box, the feeding port is communicated with the processing box, a crushing assembly is arranged in the processing box, a return cavity is arranged on one side of the crushing assembly, and a sliding opening is arranged below the return cavity; a material returning opening is formed in the upper portion of the returning cavity, a conveying assembly is arranged in the returning cavity, a vibrating screen assembly is arranged below the crushing assembly and slidably connected to the side wall of the processing box, a stirring assembly is arranged below the vibrating screen assembly and slidably connected to the side wall of the processing box, and a discharging plate is arranged below the stirring assembly. The discharging plate is fixedly connected to the box wall of the machining box, a discharging opening is formed in the bottom of the machining box, and a discharging assembly is arranged in the discharging opening. The device is simple to operate, is driven by the motor, reduces manual operation steps, simplifies tedious steps of material mixing, and is simple and convenient to operate.

The invention relates to the technical field of pulverizers, and discloses a waste plastic pulverizer, comprising a box body, a pulverizing roller, and a driving structure. Two or more pulverizing rollers are symmetrically and rotatably installed in the box body. The driving structure is arranged at both ends of the pulverizing rollers and drives the pulverizing rollers to rotate. A cooling chamber and a steam chamber are coaxially provided in the pulverizing roller. The diameter of the cooling chamber is larger than the diameter of the steam chamber. A filter ring that only allows water vapor to pass through is arranged between the cooling chamber and the steam chamber. Pure water is introduced into the cooling chamber. A plurality of nozzles connected to the steam chamber are also arranged on the surface of the pulverizing roller, and a safety valve is arranged on the nozzle. When the surface temperature of the pulverizing roller rises, the pure water in the cooling chamber absorbs heat and evaporates, so that the surface temperature of the pulverizing roller is reduced and maintained within a reasonable range, thereby avoiding equipment damage caused by overheating, and preventing local overheating of the plastic and melting, thereby ensuring the pulverizing quality, and preventing the plastic from being deformed or adhering to the equipment due to high temperature.

This invention discloses a method for preparing high specific surface area cerium phosphate nanoparticles. The modified corn starch in this invention exhibits good water solubility, resulting in a solution with good suspension and stability after dissolving in water. This suspension stability provides a spatial carrier for the formation of cerium phosphate nanoparticles. A network structure is formed through hydrogen bonding between the molecular weight chains of the modified corn starch, allowing control over the uniformity of cerium phosphate particle size. Different specific surface area values ​​of cerium phosphate can be controlled by adjusting the concentration of the modified corn starch. The modified corn starch can be removed through subsequent high-temperature sintering and washing, ultimately yielding high-purity cerium phosphate nanoparticles. These nanoparticles possess uniformity and high specific surface area, making them suitable for applications in electrode materials, adsorbent materials, luminescent materials, and polymer nanofillers.

The present invention relates to the field of edible oil processing equipment, and discloses a peanut oil blank steaming pot, which comprises: a steaming mechanism used for storing and steaming materials so as to complete softening and sterilization work of peanuts; the material spreading mechanism is arranged in the cooking mechanism and is used for pushing up the cooked materials to replace the materials in contact with the cooking mechanism, so that the problem of adhesion caused by long-time cooking is avoided, and meanwhile, the materials are uniformly in contact with the cooking mechanism; the screening mechanism is arranged on the upper side of the cooking mechanism, and the screening mechanism comprises a shaking assembly and a connecting assembly. According to the invention, through a scraping plate, a material turning plate I and a material turning plate II which are obliquely arranged in the material spreading mechanism, uniform turning of materials is realized, the materials are ensured to be fully heated in the cooking process, the phenomena of wall adhesion and local overheating are avoided, the cooking uniformity and efficiency are greatly improved, an ideal pretreatment state is provided for subsequent squeezing, and the production cost is reduced. Therefore, the oil yield and the oil quality are improved.

The invention belongs to the technical field of dibromohydantoin production, and particularly provides a dibromohydantoin synthesis method which comprises the following steps: S1, preparing a raw material aqueous solution, namely respectively mixing dimethyl hydantoin, sodium bromide and liquid caustic soda NaOH with deionized water to form a dimethyl hydantoin aqueous solution, a sodium bromide aqueous solution and a liquid caustic soda NaOH aqueous solution; s2, premixing the raw material aqueous solution, namely mixing the aqueous solution of dimethyl hydantoin, sodium bromide and caustic soda liquid NaOH prepared in S1 to obtain a premix; s3, electrochemical in-situ bromination reaction: introducing the premix into a micro-channel reactor provided with an electrolysis electrode, and applying current to the premix to obtain a dibromohydantoin initial solution; and S4, crystallizing, separating and drying the product, carrying out cooling crystallization through a three-stage stepped cooling method to obtain a dibromohydantoin crystal, carrying out centrifugal separation to obtain a dibromohydantoin wet product, and then drying to obtain a dibromohydantoin finished product. The method can improve the generation stability and the product quality of the dibromohydantoin.

The present application relates to the field of environment-friendly materials and its preparation technology, and particularly relates to a degradable environment-friendly paper cup interior coating and a preparation method thereof. The method comprises the following steps: firstly, synthesizing polymerizable quaternary ammonium salt surfactant (RPKO-X), and then introducing the polymerizable quaternary ammonium salt surfactant and a bio-based polymer solution into a polyacrylate molecular chain by a redox initiation polymerization method, so as to obtain a degradable acrylate emulsion for paper cup interior coating. By introducing the hydrophobic monomer RPKO-X with emulsifier characteristics, a stronger crosslinking network is formed, which can significantly improve the water resistance and oil resistance of the coating. Meanwhile, by introducing the bio-based material polyvinyl alcohol 2688, the environmental friendliness of the coating is enhanced, and the rapid degradation of the coating after use is promoted. By using the redox initiation polymerization system, the method is simple to prepare, can be prepared under mild conditions, and the emulsion particle size is uniform and stable.

This utility model provides a feeding device for compound fertilizer production with anti-clogging effect, belonging to the technical field of feeding devices. The utility model includes a vertically arranged connecting pipe, a storage hopper coaxially fixed at the upper end of the connecting pipe, and a discharge pipe coaxially fixed at the lower end of the connecting pipe. A controller is horizontally installed on the outer wall of the connecting pipe. A crushing device is detachably assembled in the internal cavity of the storage hopper. This utility model, by setting a crushing device inside the storage hopper, utilizes the rotation of the crushing plate around a preset axis to fully break up the moisture-laden, clump-forming compound fertilizer in the storage hopper, effectively preventing the clump-forming compound fertilizer from entering the connecting pipe and discharge pipe. This solves the pipe blockage problem caused by compound fertilizer clumping in traditional devices from the source, ensuring that the compound fertilizer can smoothly flow through the connecting pipe and discharge pipe into subsequent packaging bags or processing equipment.

The utility model discloses a waste sand regeneration equipment grinding structure which comprises an equipment body, a feeding hopper is arranged at the top of the equipment body, a smashing structure is arranged on the lower side in the feeding hopper and is in driving connection with external driving equipment, and a conical screening net with the end facing upwards is arranged at the position, corresponding to the smashing structure, of the upper end in the equipment body. The periphery of the conical screening net is fixed to the inner side wall of the equipment body, a waste cavity inclining leftwards from top to bottom is formed in the position, corresponding to the periphery of the conical screening net, in the equipment body, a waste outlet is formed in the position, corresponding to the waste cavity, of the left side wall of the equipment body, and a grinding structure is arranged on the lower side of the conical screening net. A discharging opening is formed in the bottom of the equipment body corresponding to the grinding structure, and a conical material collecting groove is formed in the bottom in the equipment body corresponding to the discharging opening, so that reclaimed sand is conveniently collected; and through primary crushing of the crushing structure and further grinding of the grinding structure, the reclaimed sand is finer while it is guaranteed that particles of the reclaimed sand are uniform, and the quality of the reclaimed sand is greatly improved.

The application provides a BiFeO3-graphitic carbon nitride photocatalyst and a preparation method and application thereof, relates to the field of photocatalysis technology, and the preparation method comprises the following steps: dissolving a bismuth source and an iron source in a solvent, mixing with a mineralizer, and performing a hydrothermal synthesis reaction to obtain BiFeO3; performing first calcination treatment on a nitrogen-containing organic precursor to obtain graphitic carbon nitride; and performing grinding treatment and second calcination treatment on the mixture of BiFeO3 and graphitic carbon nitride to obtain the BiFeO3-graphitic carbon nitride photocatalyst. The preparation method can construct a Z-type heterojunction at the interface of the separately prepared BiFeO3 and graphitic carbon nitride, form an internal electric field, efficiently separate photo-generated electrons and holes, effectively inhibit the recombination of the photo-generated electrons and holes, finally significantly enhance the redox capacity of the material, and make the material exhibit excellent photocatalytic performance, high selectivity and good cycle stability.

The present invention relates to the field of grinding equipment, specifically to a raw material grinding equipment for food additive processing, which solves the problem that the existing food additive grinding equipment has poor use effect and cannot grind two raw materials at the same time, and comprises a shell, two circular shells are arranged in the shell, a feed port and a discharge port are opened on the circular shell, and a conveying wheel is rotatably connected in the two circular shells, a feeding funnel is arranged at the upper end of the shell, a pressing plate and an inclined plate are slidably connected in the shell, and a grinding block is arranged on the pressing plate; a flat plate and a box body are arranged in the shell, a U-shaped plate and a crushing plate are slidably connected between the two box bodies, a rotating rod is rotatably connected at the upper end of the flat plate, and the end of the rotating rod is hingedly connected by a pull rod U-shaped plate, and a collecting box is arranged in the shell. The present invention can realize the conveying of raw material blocks in batches and crushing of larger raw material blocks, and can crush and grind two raw material blocks at the same time, which has better use effect than the existing grinding device and significantly improves the efficiency of food additive processing.

The invention discloses an injection molding device for processing the plastic shell of an air flow meter, and the invention relates to the technical field of injection molding devices, including a composite mechanism. The injection molding device for processing the plastic shell of an air flow meter, through the composite mechanism design, the plastic raw material enters the inside of the composite shell from the feed port, the motor rotates the rotating shaft, and the rotation of the rotating shaft rotates the rotating frame and the rotating plate, thereby achieving the effect of expanding the stirring range, improving the mixing effect, thereby ensuring the stability and consistency of the quality of the injection molded product, and cutting the plastic raw material through the cutting block, thereby achieving the effect of dividing larger raw materials, making the plastic raw material particles uniform, and uniform raw material stirring can reduce the unstable factors in the production process, reduce the scrap rate, thereby improving the efficiency and economic benefits of injection molding production, and then falling downward from the holes on the surface of the support plate, and the raw material is output to the inside of the processing mechanism through the output mechanism, which is convenient for subsequent processing.

This invention relates to the field of ion sieve technology, providing a titanium-based lithium-ion adsorbent, its preparation method, and its applications. The invention involves pyrolyzing NH2-MIL-125(Ti), then mixing it with lithium carbonate for calcination, granulating it using an ethylene-vinyl alcohol copolymer as a binder, and finally acid washing to obtain the titanium-based lithium-ion adsorbent. This invention integrates metal-organic framework (MOF)-derived carbon intercalation, nitrogen doping, and polymer-assisted granulation into a single process, preparing a particulate adsorbent with a hierarchical porous structure, strong hydrophilicity, and abundant active sites, showing great potential for industrial applications. Example results show that the adsorbent of this invention, under conditions of pH=12 and 25℃, exhibits a high Li-ion concentration of 24 h. + The adsorption capacity reached 33.95 mg / g. After five cycles of adsorption and desorption, the adsorption capacity could still reach 96.9% of the initial adsorption capacity, and the titanium dissolution loss in each cycle was only about 0.4%.

The invention discloses a stable, efficient and environment-friendly silver nanoparticle lactic acid bacteria biosynthesis method and application, firstly, a nitrate reduction test is carried out to determine the ability of strains to reduce nitrate into nitrite, and optimized strains are screened from six lactic acid bacteria; then, a response surface method is used for optimizing culture medium components for nitrate reductase production, and synthesis conditions are optimized; and synthesizing the silver nanoparticles by using the screened optimized strains. Compared with physical and chemical methods, the lactobacillus synthesis of AgNPs has the advantages of cost effectiveness, environmental friendliness, low toxicity to human cells, easiness in large-scale production, no need of dangerous chemicals, high temperature and high pressure and the like. The invention provides an efficient, stable and environment-friendly method for biologically synthesizing silver nanoparticles by using lactic acid bacteria, the improvement of antibacterial packaging materials is a key strategy and method for controlling microorganisms of chilled meat putrefaction in China, and powerful technical support is provided for scientifically, systematically, efficiently and practically guaranteeing meat safety.

The invention relates to the technical field of copper-based catalysts, and discloses a regeneration method of a methanol cracking / reforming hydrogen production copper-based catalyst, which comprises the following steps: crushing and grinding a waste copper-based catalyst into powder; carrying out acid treatment on the powder by using a mixed acid of organic acid and inorganic acid to obtain a mixed solution; adding a precipitant and a pH regulator into the mixed solution, and carrying out active substance conversion; meanwhile, metal salt auxiliary materials and auxiliaries are added, so that the comprehensive performance of the catalyst is improved; after the reaction is finished, carrying out solid-liquid separation to obtain a solid catalyst coarse material; washing with deionized water to obtain a solid catalyst washing material; and calcining to obtain the finished product powder regenerated catalyst. According to the regeneration method of the methanol cracking / reforming hydrogen production copper-based catalyst, the waste copper-based catalyst is used as a raw material, and the high-activity regenerated copper-based catalyst is prepared through regeneration procedures such as acid treatment and precipitation conversion, so that the performance of the catalyst is improved, and the catalyst is recycled.

The invention relates to the field of lithium batteries, and discloses a method for preparing lithium iron phosphate from waste lithium iron phosphate, which comprises the following steps: carrying out first sintering on waste lithium iron phosphate to obtain red powder I; detecting the contents of main elements and impurity elements in the red powder I; supplementing at least one of a lithium source, a phosphorus source, a titanium source and a vanadium source by taking the iron element as a reference according to a detection result; or detecting the contents of main elements and impurity elements in the waste lithium iron phosphate, supplementing the lithium source according to the detection result, sintering, and then supplementing at least one of the phosphorus source, the titanium source and the vanadium source; and finally, grinding, spray drying and sintering to obtain the lithium iron phosphate material. By accurately controlling the molar ratio of lithium, iron, titanium, vanadium and phosphorus, the lithium ion diffusion coefficient of lithium iron phosphate is improved from the atomic level, generation of magnetic foreign matters in the high-temperature sintering process of lithium iron phosphate crystals is inhibited, meanwhile, material particles are uniform, and the main phase purity is greatly improved.

The utility model relates to the technical field of silkworm feed forming, and discloses feed forming equipment which comprises a working plate, a supporting assembly is fixedly connected to the bottom end of the working plate, an air cylinder is fixedly connected to the interior of the left side of the supporting assembly, and a connecting disc is fixedly connected to the driving end of the air cylinder. A first connecting rod is rotationally connected to the interior of one side of the connecting disc, a second connecting rod is rotationally connected to one side of the first connecting rod, a cutting knife is fixedly connected to the right end of the second connecting rod, a sliding rod is fixedly connected to the top end of the connecting disc, and a first connecting block is fixedly connected to the exterior of the sliding rod. A lever is rotationally connected to one side of the first connecting block, and a second connecting block is fixedly connected to the outer portion of the lever. According to the feed pressing and cutting device, the labor intensity of manual pressing and cutting of workers is reduced, the uniformity of the shape and the size of feed can be ensured, and therefore the quality stability of the feed is improved, and the pressed feed particles can be more uniform through the springs.

The invention discloses a screening method of flaky or spherical nano SiC, and belongs to the technical field of dispersion screening methods.The screening method comprises the steps that S1, SiC powder, a grinding medium, a ball milling tank, a mixed solvent, a dispersing agent and a modifying agent are prepared; s2, sequentially loading the weighed grinding medium and SiC powder into a ball milling tank; s3, preparing a mixed solvent, wherein the mixed solvent comprises benzene, alcohol and ketone; s4, dissolving a dispersing agent and a modifying agent into the mixed solvent; pouring the mixed solvent into a ball-milling tank, mixing the mixed solvent with a grinding medium and SiC powder, and setting the rotating speed of the ball-milling tank to form pre-dispersed slurry; s5, adding an adhesive, namely PVB (Polyvinyl Butyral) or DBP (Dibutyl Phthalate) or PVB sol, into the pre Setting the rotating speed of the ball-milling tank, determining the ball-milling time, and continuing ball-milling and mixing to form mixed slurry; s6, the final mixed slurry is sieved through a 40-mesh sieve and filtered, and the SiC slurry with uniform particles and uniform dispersion can be obtained after filtering is completed.

This utility model proposes a filter cake breaking device for a filter press, which includes a vibration bearing component, a transfer positioning component, a transverse crushing component, a longitudinal crushing component, an excitation drive component, and a residual material cleaning component. The device adopts the principle of vibration crushing, and drives the grid composed of transverse and longitudinal strips to vibrate at high frequency through an excitation motor. It can perform efficient and multi-directional active cutting of the filter cake, with high crushing efficiency and uniform particle size. The continuous vibration effectively prevents sticky and wet materials from clogging the grid, ensuring the continuity and stability of unloading. The residual material cleaning component drives the scraper through a transfer mechanism to automatically remove residual filter cake, realizing equipment self-cleaning and greatly reducing the need for manual intervention and maintenance.

The utility model relates to the technical field of gypsum block production, and discloses a stirrer for gypsum block production, which comprises a stirring box, the top of the stirring box is fixedly connected with a motor I, the inner top wall of the stirring box is fixedly connected with a fixed block, the outer part of the fixed block is rotatably connected with a moving part, and the moving part is fixedly connected with a motor II. A second gear is fixedly connected to the bottom of the moving part, a stirring rod is fixedly connected to the outer portion of the second gear, a mounting block is rotatably connected to the bottom of the second gear, and a gear ring is fixedly connected to the inner wall of the stirring box. According to the gypsum stirring device disclosed by the utility model, the gear I drives the gear II to rotate, so that the gear II moves along the gear ring while rotating under the action of the gear ring, the stirring area is increased, and gypsum adhered to the inner wall of the stirring box is scraped off through the connecting rod, so that the gypsum can be fully mixed and stirred in all directions; the properties of the gypsum and other materials can be fully exerted and improved.

The present invention relates to a method for solidifying chlorine and / or fluorine-containing radioactive waste by glass ceramics, which comprises: adding radioactive waste according to the ratio of chlorine and / or fluorine in the radioactive waste to P in Ca3(PO4)2, P (mol) :F(Cl) (mol) =3-5, dry and exhaust after mixing evenly, grind the obtained material into powder; introduce the powder into a graphite mold; place the graphite mold in a sintering furnace; evacuate the sintering furnace, set the pressurization pressure to 0.3t-1.5t, set the heating program to 50-100℃ / min and heat to 350-550℃, and perform spark plasma sintering for 1-3mins; use a demoulding machine to remove the glass ceramic solidified body from the graphite mold. The present invention also provides a glass ceramic solidified body obtained according to the above method. According to the method of the present invention, the material is converted into a solidified body form in one step, which simplifies the preparation process, has a simple process, and is short in time.

The utility model relates to the technical field of carbonated nitrogen preparation, and discloses sample grinding equipment based on carbonated nitrogen preparation, which comprises a rack, carrying columns are arranged on the left side and the right side of the rack in a penetrating manner, the rack is rotatably connected with the carrying columns through bearings, an outer grinding block is fixed between the two carrying columns, and the bottom of the outer grinding block is fixedly communicated with a storage hopper. A fixing plate is fixed to the bottom of the storage hopper, cover plates are hinged to the front side and the rear side of the fixing plate, lock catches are arranged on the cover plates and used for locking the positions of the storage hopper and the cover plates, the fixing plate and the two cover plates are used for blocking the bottom of the storage hopper, and a first hydraulic cylinder is arranged at the bottom of the fixing plate. The driving assembly pulls the gear to rotate, so that the gear pulls the outer grinding block to turn over back and forth intermittently by means of the carrying column, graphite-phase carbon nitride can be ground back and forth between the outer grinding block and the inner grinding block for multiple times, and ground graphite-phase carbon nitride particles are uniform as far as possible.

The utility model discloses a raw material mixing device for food processing, which comprises a mixing cylinder, a cylinder body cover arranged at the top end of the mixing cylinder, a grinding cylinder erected at the top of the cylinder body cover, material guide pipes symmetrically connected with two ends of the top surface of the cylinder body cover in a penetrating manner, a screen frame groove formed in the inner side of the top end of each material guide pipe, and a filter frame embedded in the screen frame groove, a filter screen is fixedly laid on the top surface of the filter frame, discharge openings are symmetrically formed in the two ends of the bottom surface of the grinding cylinder in a penetrating mode, frame pressing rings are fixedly connected to the top ends of the inner sides of the discharge openings, and a grinding disc is arranged in the grinding cylinder; a grinding and screening dual-pretreatment structure is additionally arranged, the grinding disc in the grinding cylinder is matched with the rough grinding surface, granular or caked raw materials can be ground and refined, the filter frame and the filter screen are matched to screen the ground raw materials, and it is ensured that raw material particles entering the mixing cylinder are uniform; the problem of non-uniform mixing caused by non-refining of the raw materials is effectively solved, and the quality of a mixed finished product is remarkably improved.

The invention relates to the technical field of biological polysaccharide cross-linking agents, in particular to application of a diaminodiketopiperazine compound, and the diaminodiketopiperazine compound is used as a cross-linking agent in the preparation process of cross-linked biological polysaccharide gel. The diaminodiketopiperazine compound is a compound with a structure shown as a formula I or a pharmaceutically acceptable salt thereof: # imgabs0 #, wherein R is normal alkyl or isoalkyl with the carbon atom number smaller than or equal to 10; the preparation process of the cross-linked biological polysaccharide gel comprises the following steps: dissolving and uniformly mixing biological polysaccharide and the diaminodiketopiperazine compound in water or a buffer solution, then adding a condensing agent to form a reaction solution, and carrying out a cross-linking reaction to obtain the cross-linked biological polysaccharide gel, according to the invention, the diaminodiketopiperazine compound is used as a cross-linking agent to cross-link the biological polysaccharide, so that the biological polysaccharide gel has higher cell survival rate and better biological safety, and the prepared gel has better viscoelasticity and thermal stability and can tolerate moist heat sterilization.

The application discloses a composite positive electrode material applied to a sodium ion battery and a preparation method thereof, which is obtained through one-step reaction sintering of five phases of sodium phosphate, zirconium dioxide, silicon dioxide, sodium carbonate and manganese dioxide by a planetary ball mill, drying, sieving and calcining. The composite positive electrode material can obtain two phases through a precursor one-step method, the product is more uniform, the operation is simple and easy to implement, the time consumption is short, the method is economic and environment-friendly, and is beneficial to industrialized production. The composite material can be applied to a sodium ion battery, and the cycle stability of the composite material is better than that of a pure phase Na 0.7 MnO 2.05 .

The invention discloses red and blue LED fluorescent powder for plant growth and a preparation method of the red and blue LED fluorescent powder. The chemical composition of the fluorescent powder is Na2Zr1-x-y (WO4) 3: xNi < 2 + > and yFe < 2 + >, x is the concentration of doped Ni < 2 + > and is equal to 0.01-0.1, and y is the concentration of doped Fe < 2 + > and is equal to 0.01-0.1. The fluorescent powder can emit 400-500nm high-intensity blue light and 660-700nm red light under the excitation of 320-360nm ultraviolet light, and can effectively promote the growth and development of plants corresponding to absorption spectrums of various pigments in the growth and photosynthesis of roots, stems and leaves of the plants. The raw materials of the fluorescent powder are all non-rare earth materials, so that the cost is low; the fluorescent powder is small in particle size, uniform in particle and high in luminous intensity; the raw materials and the product are non-toxic and environment-friendly, and are potential novel luminescent materials in the field of plant lighting LEDs.

The invention provides a preparation method of fiber-reinforced zirconium oxide powder. The preparation method comprises the following steps: preparing composite zirconium oxide powder co-doped with yttrium oxide and functional metal (praseodymium, scandium or cerium) oxide from soluble metal zirconium salt, soluble metal yttrium salt and functional metal salt through a hydrothermal precipitation method; wherein the yttrium oxide and the functional metal (praseodymium, scandium or cerium) oxide further improve the conductivity of the zirconium oxide powder while keeping the structural stability of the powder. And mixing the ceramic fiber powder subjected to surface pretreatment as a synergistic toughening material with the composite zirconium oxide powder, and carrying out subsequent treatment to obtain the fiber-reinforced zirconium oxide powder. By introducing the high-strength and high-toughness ceramic fiber powder into the composite zirconium oxide powder, macroscopic cracks can be blocked when penetrating through fibers, so that the strength and toughness of a powder product are improved. The fiber-reinforced zirconium oxide powder prepared by the method is uniform in particle, good in dispersity, good in stability and high in conductivity, and a powder product is high in mechanical strength and good in toughness.

The utility model discloses intelligent casting sand recovery and reutilization equipment, which relates to the technical field of sand recovery and utilization, and comprises a processing box, a crushing box arranged at the top of the processing box, a feed hopper arranged at the top of the crushing box, a discharge pipe arranged at the bottom of the processing box, and rotating columns uniformly and rotatably arranged on the inner wall of the processing box, rollers are evenly arranged on the outer surfaces of the rotating columns, transmission gears are arranged at one ends of the transmission columns, the transmission gears are located outside the machining box, and the transmission gears are meshed with one another. A static jaw plate is arranged on the inner wall of one side of the crushing box, the casting waste sand sintered between the movable jaw plate and the static jaw plate is preliminarily crushed through relative movement of the movable jaw plate and the static jaw plate, and then the small casting waste sand is secondarily crushed through a roller on a rotating column, so that the particle size of the casting waste sand is more uniform, and the quality and performance of reclaimed sand are improved; therefore, the defects such as air holes and inclusions in subsequent castings can be reduced, and the quality and precision of the castings can be effectively improved.