241results about How to "Large particle size" patented technology

The invention belongs to the technical field of metal powder preparation, and discloses a method for preparing silver powder through reduction of hydrazine hydrate with the adjustable particle size. The preparation method comprises the following steps that a first dispersing agent is dissolved in deionized water, a silver-ammonia solution and a hydrazine hydrate solution are sequentially added, stirring reaction is conducted, and nano-silver seed crystal sol is obtained; uniformly mixing the obtained nano-silver seed crystal sol with a hydrazine hydrate solution and a second dispersing agent to obtain a reducing base solution; adding a surface modifier into absolute ethyl alcohol, and uniformly dissolving to obtain a surface modification coating solution; preparing a silver-ammonia solution, adding the prepared silver-ammonia solution into the reducing base solution, then adding the surface modification coating solution, and stirring for reaction to obtain silver powder slurry liquid; and after solid-liquid separation, a solid phase is taken, washed and dried, and silver powder is obtained. The preparation method is simple in process, the particle size of the silver powder can be adjusted through the adding amount of the seed crystal, and the prepared silver powder particles are uniform in particle size distribution, high in dispersity and suitable for the fields of conductive silver paste, electronic packaging and the like.

The invention relates to the technical field of sewage treatment, and discloses an advanced treatment method and device for ship oily wastewater, and the method comprises the following steps: carrying out preliminary filtration on the ship oily wastewater to remove suspended solids and particulate matters so as to obtain first oily wastewater; the first oily wastewater is subjected to coalescence separation treatment, floating oil, dispersed oil and a small part of emulsified oil in the wastewater are removed, the oil content in the wastewater is reduced to 500 ppm or below, and second oily wastewater is obtained; the second oily wastewater is subjected to cross-flow ultrafiltration deep treatment, emulsified oil and dissolved oil are intercepted, produced water and concentrated water are obtained, and the concentrated water serves as third oily wastewater; the third oil-containing wastewater flows back to the first oil-containing wastewater, and discharged water is obtained after the produced water is detected to be qualified. The invention provides a primary filtration, coalescence separation and ultrafiltration three-stage circulating filtration method, emulsified oil and dissolved oil can be efficiently separated and removed, oil resource recovery is realized, and membrane pollution is reduced.

The invention provides a coalescence-selective filtration-deep bed filtration efficient oil-water separation system which comprises a coalescence system, a selective filtration system and a deep bed filtration system, oily wastewater enters a coalescer, and tiny oil droplets are coalesced into larger oil droplets through wetting coalescence and collision coalescence; the coalesced wastewater enters a selective filter, oil droplets and water respectively flow out through an oil channel and a water channel, and primary separation is realized; according to the present invention, the water after the primary separation enters the deep bed filter to achieve the deep separation, the efficient oil-water separation and the water quality standard discharge or reuse are achieved through the combination process of coalescence, selective filtration and deep bed filtration, and the system has advantages of high treatment efficiency, low energy consumption, less carbon emission, oil and water recycling, or water standard discharge.

The invention discloses a steel slag whole-process dry treatment process, and belongs to the technical field of steel slag treatment. Comprising the following steps: S1, a rolling procedure: carrying out rolling crushing on liquid steel slag, and in the process, cooling by adopting an air cooling mode to solidify the liquid steel slag; s2, a cooling procedure, wherein the steel slag obtained in the step S1 is cooled to 100 DEG C or below in a non-air-cooling mode; s3, a grinding procedure; s4, a sorting procedure; and S5, a waste heat recovery process, wherein heat released by the steel slag in the rolling process and the cooling process is recycled. The invention further discloses a steel slag whole-process dry processing system. Through reasonable design, gradient cooling is formed in the rolling procedure and the cooling procedure, meanwhile, heat released by steel slag in the two procedures is recycled, and the problem that the steel slag treatment waste heat recovery rate is low is solved.

The invention belongs to the technical field of energy and petrochemical engineering catalysts, and particularly discloses a preparation method and application of a copper-zinc-aluminum spinel solid solution catalyst. The Cu-Zn-Al spinel solid solution catalyst is prepared by ball-milling copper, zinc and aluminum precursors and then roasting at 800-1200 DEG C in the air atmosphere, and the preparation method is simple, does not need a large amount of solvent, is less in wastewater and avoids the influence of other impurity ions. The Cu-Zn-Al spinel solid solution catalyst prepared by the invention is used for methanol reforming hydrogen production reaction, the methanol conversion rate is as high as 95.5%, the H2 selectivity in the product is 74.8%, and the CO selectivity is 0.76%, so that the Cu-Zn-Al spinel solid solution catalyst has high activity, high selectivity and good reaction stability.

The invention discloses a preparation method and application of a CuBi2O4 film electrode, and belongs to the field of film materials. The preparation method of the CuBi2O4 film electrode comprises the following steps: mixing an aqueous solution of 0.05 mol / L-0. 2 mol / L copper acetate and an aqueous solution of 0.05 mol / L-0. 2 mol / L sodium acetate to obtain an electrolyte I, and obtaining a Cu2O film on FTO (Fluorine-doped Tin Oxide) by adopting an electrodeposition method; adding a coordination agent, KOH and fused salt KNO3 into a 0.05 mol / L-0. 3 mol / L bismuth nitrate solution or adding water to dilute to obtain a solution II; and pulling and dipping the obtained Cu2O film in the solution II, carrying out annealing treatment, washing with deionized water, and drying to obtain the CuBi2O4 film electrode. According to the preparation method disclosed by the invention, Cu2O with uniform surface and good compactness is obtained by regulating and controlling the concentration ratio of cupric acetate to sodium acetate, and the high-quality CuBi2O4 film electrode is prepared by optimizing the concentrations of the coordination agent, the mineralizing agent and the fused salt on the basis.

The invention belongs to the technical field of molecular probes and nano textile materials, and particularly relates to a fluorescent probe for detecting metal palladium, a fluorescent nanofiber membrane and a preparation method and application of the fluorescent nanofiber membrane. The fluorescent probe for detecting metal palladium provided by the invention takes benzopyran as a fluorescent parent nucleus and allyl as a recognition site, is novel in structure, and can realize effective detection of elemental palladium in the environment. Furthermore, according to the fluorescent nanofiber membrane for detecting the metal palladium, the electrostatic spinning technology and the fluorescent probe are effectively combined, and rapid detection of the elemental palladium can be achieved through the fluorescence opening performance after the fluorescent probe reacts with the metal palladium. Besides, the fluorescent nanofiber membrane has the characteristics of simplicity in preparation, low cost and reusability, can provide a powerful tool for rapid, simple and convenient detection of palladium-containing elementary substance pollutants in the environment, and has an extremely wide application prospect in the field of metal palladium detection.

The invention discloses a bimetallic Ag and Pd loaded WO3 material and a preparation method thereof, and relates to the technical field of sensor material preparation, and the preparation method comprises the following steps: 1, dissolving a tungsten source in an ethanol solution, mixing, hydrolyzing, aging, precipitating, washing, drying, calcining and cooling; 2, adding deionized water, adding a silver source solution and a palladium source, adding ascorbic acid, and stirring; 3, centrifuging, washing with ethanol and deionized water, and drying; 4, selecting a gold interdigital electrode with aluminum oxide ceramic as a substrate as a base electrode material, dipping the WO3 nano-particle dispersion liquid by using a line drawing pen, and uniformly coating the WO3 nano-particle dispersion liquid on the surface of the interdigital electrode; and 5, electrode drying and heat treatment. The efficient gas sensing material is prepared through the preparation method which is easy to operate, environmentally friendly and economical, and the gas sensing material has the advantages of being high in sensitivity, rapid in response, good in selectivity and the like at the low working temperature.

The invention relates to the technical field of nano-liposomes, and discloses cardamonin nano-liposomes for promoting transdermal absorption and a preparation method and application thereof, the cardamonin nano-liposomes comprise an inner phase and an outer phase, the inner phase comprises the following raw materials in parts by weight: 5-10 parts of cardamonin, 2-10 parts of lecithin and 5-20 parts of grease, and the outer phase comprises the following raw materials in parts by weight: 5-10 parts of cardamonin, 2-10 parts of lecithin and 5-20 parts of grease; the stabilizer is carboxymethyl chitosan; an external phase: 0.1-5 parts of a surfactant, 0.1-3 parts of a stabilizer, 10-20 parts of short-chain alcohol and 44.9-80 parts of water; the mixture of the external phase and the internal phase is sequentially subjected to homogenization treatment and microjet homogenization treatment, and the cardamonin nano-liposome for promoting transdermal absorption is prepared. The cardamonin nano-liposome for promoting transdermal absorption provided by the invention is a flexible liposome, and can moisten skin and reduce moisture loss on the skin surface; the transdermal amount and retention amount of the carried components are obviously improved; the permeability of the cardamonin to the skin cell membrane is enhanced.

The invention provides high-speed steel and a preparation method thereof, the high-speed steel relates to the technical field of tool steel, and the high-speed steel comprises the following chemical components in percentage by mass: 1.00%-2.00% of carbon, 4.00%-8.00% of chromium, 3.00%-6.00% of molybdenum, 2.00%-5.00% of vanadium, 3.00%-6.50% of tungsten, 4.00%-10.00% of cobalt, 0.01%-0.30% of zirconium, 0.10%-0.40% of silicon and the balance of iron and impurities. According to the high-speed steel, the problems that in traditional cast-forged high-speed steel, core eutectic carbide segregation is serious, and eutectic carbide particles are coarse can be solved, and the problems that existing high-vanadium high-speed steel is coarse in MC carbide particles, poor in grindability and low in grinding machining efficiency can also be solved.

The continuous flow sludge rapid granulation system based on particle size separation comprises a micro-aerobic tank, an aerobic tank, a precipitation device and a particle size separation device, the micro-aerobic tank is communicated with the aerobic tank, the precipitation device and the particle size separation device are both installed on the upper portion of the aerobic tank, the bottoms of the precipitation device and the particle size separation device are both communicated with the aerobic tank, the micro-aerobic tank is communicated with the precipitation device, and the particle size separation device is communicated with the precipitation device. And the precipitation device is communicated with the particle size separation device. Wherein the particle size separation device realizes screening and enrichment of granular sludge, and a continuous flow aerobic granular sludge system with a high granulation ratio is rapidly formed; the precipitation device can accelerate the formation of the granular sludge, and long-term stable operation of the granular sludge is ensured by coexistence of the precipitation device and the granular sludge; the outer-layer aerobic and inner-layer anoxic / anaerobic microenvironment can be used for synchronously removing phosphorus by nitrification and denitrification. The continuous flow aerobic granular sludge which operates stably for a long time and has good carbon, nitrogen and phosphorus removal performance can be rapidly cultured, in addition, investment is small, compatibility is easy, the occupied area and operation energy consumption are saved, and the method has good application prospects.

The invention discloses a flash release powder composition as well as a preparation method and application thereof. The flash release powder composition comprises erythritol, xylitol, fructo-oligosaccharide, a cooling agent and silicon dioxide, wherein in the flash release powder composition, the erythritol accounts for more than 80% by mass, the xylitol accounts for less than 1.5% by mass, the fructo-oligosaccharide accounts for 5%-15% by mass, the cooling agent accounts for 0.01%-3.0% by mass, and the silicon dioxide accounts for 0.5%-2.0% by mass; the flash release powder composition is prepared in a wet granulation mode, and in the wet granulation process, the cooling agent, ethyl alcohol and water are mixed to prepare granulation liquid, and the granulation liquid is sprayed into a mixed material of other raw materials; the quick-release powder composition can improve the aspects of choking powder, quick-release taste and granulation fluidity, and can be used for preparing multifunctional food, so that the prepared food can bring better consumption experience to consumers.

The utility model relates to the technical field of nozzle devices, and provides a pneumatic atomization nozzle device which comprises an atomization body provided with an atomization nozzle and a water inlet. The air entraining pipe is arranged in the atomization main body, and the air entraining pipe is provided with an air channel; the rotating head is rotationally arranged at one end of the air guiding pipe, the rotating head is provided with an outlet, the outlet faces the atomizing nozzle and communicates with the air channel, and an atomizing cavity is formed among the rotating head, the air guiding pipe and the inner wall of the atomizing body; and the outlet, the atomizing nozzle and the water inlet are communicated with the atomizing cavity. By means of the technical scheme, the problems that in the prior art, an internal structure is limited and is easily affected by air pressure, and the water pressure and the air pressure in the spray head can fluctuate up and down, so that the atomization particle size cannot be stabilized are solved.

The invention discloses a functionalized polystyrene composite microsphere and a preparation method thereof, and belongs to the technical field of high polymer chemistry and high polymer materials. The functionalized polystyrene composite microspheres are prepared by adopting a one-pot method. A dispersing agent is dissolved in a mixed solution of deionized water and ethyl alcohol to form a dispersion medium, and the dispersion medium and the dispersion medium are mixed uniformly through mechanical stirring; the preparation method comprises the following steps: adding an initiator, a cross-linking agent, a functional polymer or / and a functional monomer into styrene, ultrasonically mixing uniformly, pouring into a dispersion medium, continuously mechanically mixing to obtain a stable reaction system, and starting a heating reaction; after the reaction is finished, filtering, washing and drying a sample after the sample is cooled to room temperature, so as to obtain the functionalized polystyrene composite microspheres. The microspheres prepared by the invention not only have good stability, but also solve the problems of complex preparation process, low functionalization degree and high price of functionalized polystyrene microspheres, and are beneficial to subsequent popularization and application of the functionalized polystyrene composite microspheres.

The invention discloses a slow-release temperature-controlled antifouling agent microsphere and a preparation method and application thereof, the method comprises the following steps: (1) mixing sodium alginate, copper pyrithione and a CaCl2 solution for reaction, freeze-drying, grinding and crushing to prepare intermediate product particles; and (2) mixing the intermediate product particles in the step (1) with a chitosan solution for reaction, then adding a glutaraldehyde solution for continuous reaction, and freeze-drying to obtain the antifouling agent microspheres. The sodium alginate and chitosan double-crosslinking preparation method adopted by the invention is novel, a double-layer drug-loading structure is constructed by virtue of the crosslinking effect of sodium alginate and calcium ions and the electrostatic interaction between anions and cations of sodium alginate and chitosan, and the thought is novel.

The invention belongs to the technical field of probiotics, and particularly relates to a probiotic microcapsule with digestion resistance and adhesion as well as a preparation method and application of the probiotic microcapsule. According to the preparation method of the probiotic microcapsule with digestion resistance and adhesion, polyphenol, metal ions, soybean protein isolate and xanthan gum are adopted as wall materials, a polyphenol-metal ion complex coating and a complex coacervation system are constructed, and the microcapsule with a double-layer packaging structure is formed. According to the invention, through complexing of tannic acid and iron ions, a uniform coating is firstly formed on the surface of the probiotics, so that the adhesion is improved, and the packaging rate of the probiotics is improved. Meanwhile, the soybean protein isolate and the xanthan gum have a synergistic effect by utilizing the high stability of the soybean protein isolate and the xanthan gum, so that the activity of the probiotics in the storage period is effectively protected, high-quantity protection on the probiotics in a simulated digestion environment can be effectively realized, the probiotics enter intestinal tracts with high stock and high activity and are subjected to high-quantity colonization, and the probiotics are suitable for being developed and applied in probiotic preparations.

The present invention provides a particle collision disturbance type gas lift loop reactor, the reactor comprising: a reactor body; a draft tube with a sieve plate; particles, which can be suspended inside the draft tube when the reactor is running; a gas distributor; a main liquid distributor; a gas inlet; a liquid inlet; a gas outlet; and a liquid outlet. Compared with the traditional gas lift loop reactor, due to the turbulent disturbance of particles and fluid inside the draft tube of the reactor, it helps to prevent gas phase aggregation and increase liquid phase back mixing, so that the gas and liquid phases in the reactor are fully mixed, the solubility of the gas phase in the liquid phase and the gas-liquid contact area are increased, the mass transfer rate and heat transfer rate between fluids are improved, and at the same time, the temperature distribution in the reactor is uniform, which is conducive to gas-liquid two-phase reaction or gas-liquid-solid three-phase reaction, and can be widely used in gas-liquid two-phase or gas-liquid-solid three-phase chemical reaction processes.

The utility model relates to the technical field of salt lake boron resources, and particularly discloses a crystallization system for preparing borax from salt lake brine, which comprises a first hot melting batching tank, a second hot melting batching tank, a first set of crystallization tank, a second set of crystallization tank, a buffer tank and a centrifugal machine, the first crystallization tank comprises a first crystallization tank, a second crystallization tank, a third crystallization tank and a fourth crystallization tank, the second crystallization tank comprises a fifth crystallization tank, a sixth crystallization tank, a seventh crystallization tank and an eighth crystallization tank, the first hot melting batching tank collects borax mother liquor, and the borax mother liquor is mixed with a surface active additive and then enters the first crystallization tank in sequence; after the first set of crystallizing tank is cooled to a certain temperature, the materials enter a second hot-melting batching tank in a manner of introducing the discharged materials into a groove, and the materials in the second hot-melting batching tank are sequentially pumped into the second set of crystallizing tank through a pump, are continuously cooled to a certain temperature, enter a buffer tank and then enter a centrifugal machine to be separated; according to the utility model, accurate temperature and time control is carried out on two-stage cooling crystallization, and the device has the characteristics of large borax grains and no caking of products.

The invention belongs to the technical field of metal materials and radiation protection, and particularly relates to a preparation method of thermal neutron shielding steel. According to the method, efficient spray forming of the B4C / 304 stainless steel composite material is achieved through a gas-solid two-phase flow driving mechanism under the negative pressure environment, B4C ceramic particles are evenly dispersed and embedded into a 304 stainless steel matrix, and due to the strong driving force of gas-solid two-phase flow, firm interface bonding is formed between the B4C particles and the matrix. According to the process, gas atomization and solid-phase medium particles are combined, a gas-solid two-phase mixed flow is formed, the atomization efficiency is greatly improved, the powder particle size is refined, reinforced phase distribution is optimized, and a new way is opened up for preparation of the high-performance thermal neutron shielding steel composite material.

Provided is a method for producing a sulfide solid electrolyte capable of efficiently producing a sulfide solid electrolyte having high ionic conductivity in which an increase in particle diameter and an enlargement in particle size distribution are suppressed, the method comprising: mixing raw material-containing substances containing a plurality of raw materials in a first solvent to obtain a solution containing an electrolyte precursor; the raw material comprises at least one atom selected from a lithium atom, a phosphorus atom, a sulfur atom and a halogen atom; removing the solvent from the solution to obtain an electrolyte precursor; bringing the electrolyte precursor into contact with a second solvent; the second solvent is different from the first solvent and is a hydrocarbon solvent.

The invention discloses a refractory COD emergency treatment adding device and a control method, and relates to the technical field of wastewater treatment in environmental protection engineering, the refractory COD emergency treatment adding device comprises a stock bin used for storing activated carbon, the stock bin is provided with a feeding pipeline used for conveying the activated carbon to the stock bin, and a feeding electric valve is arranged at the bottom of the stock bin; the weighing mechanism is used for weighing the activated carbon and comprises a hopper and a weighing sensor, the hopper is supported on the weighing sensor and located at the bottom of the stock bin, the hopper is connected with a feeding electric valve of the stock bin, the stirring device is connected with the hopper, and the stirring device is used for receiving the weighed activated carbon and quantitatively adding water for stirring; the conveying device is connected with the stirring device and used for conveying the stirred activated carbon aqueous solution into the COD treatment system, the adding amount of the activated carbon is accurate, the activated carbon is uniformly dispersed after being stirred, and the wastewater treatment effect of the COD treatment system can be improved.

The invention discloses a natto peptide sea cucumber polysaccharide liposome for synergistically improving cardiovascular health and a preparation method and application thereof, belongs to the field of active peptide delivery systems, and aims to solve the stability problem of natto oligopeptide in gastrointestinal digestive tracts. The phytosterol and the vitamin E are filled between phospholipid double layers of the liposome to support a gap between the phospholipid double layers, and the ratio of the phytosterol to the vitamin E is (1-3): 1, so that the natto oligopeptide liposome has the effects that the storage of the natto oligopeptide and the stability of the natto oligopeptide in gastrointestinal and digestive tracts can be improved, the bioavailability of the natto oligopeptide liposome is improved, and the bioavailability of the natto oligopeptide liposome is improved. The traditional Chinese medicine composition has synergistic effects in the aspects of anticoagulation, thrombolysis and blood fat reduction, and has a good cardiovascular protection effect.

The invention relates to the technical field of textile printing and dyeing, in particular to a polyurethane adhesive for textile pigment ink and a preparation method of the polyurethane adhesive. The polyurethane adhesive is prepared through the combined action of the waterborne polyurethane emulsion, the solvent, the surfactant, the stabilizer, the cross-linking agent and the ethylene glycol. The prepared polyurethane adhesive is small in particle size and can present a clear printing effect; the stability is excellent, the particle size is not increased after the printing ink is compounded with color paste, and the printing quality and durability are powerfully guaranteed; the wet friction performance of a printed cloth cover is excellent, and the durability of a printed product is remarkably improved; the ethylene glycol humectant is adopted, so that the moisturizing performance of the adhesive is further improved, and particle size increase and performance reduction caused by water evaporation are effectively prevented; meanwhile, the waterborne polyurethane resin is adopted, so that the adhesive is more environment-friendly.

The invention discloses a preparation method of silicon dioxide for a powder coating, and belongs to the technical field of precipitation method silicon dioxide preparation, a sodium silicate solution with a specific modulus is selected to be prepared into a proper concentration, and a large amount of silicic acid is generated in the solution in combination with a specific proportion, temperature and early-stage rapid acid adding mode; a large number of uniform primary silicon dioxide particles can be quickly formed, the silicon dioxide particles with high specific surface area and high surface energy are finally separated out, and the growth and aggregation of the silicon dioxide particles are effectively controlled in a manner of slowly adding acid according to a specific proportion and temperature subsequently, so that the silicon dioxide aggregate with uniform particle size is formed; the water-soluble amino acid is added into the silicon dioxide slurry, so that the silicon dioxide particles are endowed with charge property, the finally dried silicon dioxide powder can be directly used in the powder coating, mechanical crushing is not needed again, the energy consumption is reduced, a surfactant is not needed, the influence on the environment in the production process can be avoided, and the method is energy-saving and environment-friendly.

The invention relates to a method for forming an ordered intermetallic compound on the surface of a shape-controllable core-shell structure and application, and the method comprises the following steps: depositing an alloy component on the surface of a palladium seed through a seed mediation method to obtain platinum-based core-shell nanoparticles, loading the platinum-based core-shell nanoparticles on a carrier, and then carrying out negative-pressure short-time heat treatment at 350-450 DEG C to obtain shape-maintained core-shell particles with ordered surfaces; the metal components in the alloy are selected from at least one of Fe, Co or Cu and Pt. Compared with the prior art, the method has the advantages that the metal components form the ordered phase on the surfaces of the particles through surface component evolution in a mild heat treatment mode under the low-temperature condition under the condition that the original special morphology and structure of the particles are not sacrificed, the morphology loss of the nanoparticles under high-temperature heat treatment can be effectively avoided, and the performance of the nanoparticles is improved. The particle size is increased due to agglomeration and Ostwald ripening. Meanwhile, compared with original particles, the obtained Pt-based core-shell particles with controllable morphology and ordered surfaces have enhanced activity and stability.

The invention provides a preparation method of micron-sized spherical silver-coated copper powder for the electronic industry, and belongs to the technical field of conductive materials.The preparation method comprises the steps that a copper sulfate solution and ethyl alcohol react to obtain a first solution; adding an ammonium oxalate solution into the first solution to obtain slurry; adding a silver nitrate solution and an ammonium oxalate solution into the slurry, and performing stirring, standing and vacuum drying to obtain an oxalate precursor precipitate; mixing the oxalate precursor precipitate with stearic acid, carrying out first vacuum mixing and kneading, adding fumed silica particles, and carrying out second vacuum mixing and kneading to obtain powder; and heating the powder to 135-145 DEG C in a vacuum state, preserving heat for 1.5-2.5 hours, continuously heating to 270-320 DEG C, preserving heat for 1.5-2.5 hours, cooling to room temperature along with a furnace, and carrying out acid pickling, suction filtration, washing, drying and sieving. The micron-sized spherical silver-coated copper powder is high in oxidation resistance, short in process period and high in yield.

The high-concentration degradation-resistant wastewater treatment system comprises a hydrolysis acidification tank, an anaerobic reactor, an intermediate water tank, an aerobic granular sludge reaction tank and an MBR (membrane bioreactor) which are sequentially communicated in the wastewater flow direction, part of effluent of the anaerobic reactor flows back to the hydrolysis acidification tank for retreatment, and the rest of the effluent enters the intermediate water tank; the effluent of the middle water tank respectively enters an aerobic granular sludge reaction tank for decarbonization, denitrification and dephosphorization treatment and enters an MBR (Membrane Bioreactor) to make up the demand of denitrification on a carbon source; through coupling linkage and synergistic effect of the hydrolytic acidification reaction tank, the anaerobic reactor, the aerobic granular sludge reaction tank and the MBR bio-membrane reactor, the effluent concentration is controlled. A hydrolysis acidification pool and an anaerobic reactor are combined for internal circulation of a water outlet part, impact of high concentration on the anaerobic reactor is reduced, biogas produced by the anaerobic reactor is used for power generation, energy recovery and energy consumption saving, the purposes of energy conservation and emission reduction are achieved, and the problems that an existing treatment device and technology are tedious in process, long in hydraulic retention time and low in cost are solved. And meanwhile, the treatment effect is improved.

The invention discloses a silicon nitride crystal based on a physical vapor transport method and a preparation method thereof, and the preparation method comprises the following steps: laying silicon nitride powder as a raw material at the bottom of a graphite crucible, fixing a seed crystal on a top cover of the crucible, placing the device in single crystal growth equipment, vacuumizing, heating to 1000-1300 DEG C, filling nitrogen to 800-1000 mbar, and preserving heat for 1-3 hours, the method comprises the following steps of: heating to the temperature of between 1,600 and 2,000 DEG C, inhibiting the decomposition of silicon nitride, continuously heating to the temperature of between 1,600 and 2,000 DEG C, adjusting the air pressure in equipment to 100 to 300 mbar, and promoting the silicon nitride to be decomposed into silicon steam and nitrogen. And controlling the temperature of a seed crystal area to be 1500-1700 DEG C and the axial temperature gradient to be 10-50 DEG C / cm, so that Si and N substances in a gas phase are crystallized on the surface of the seed crystal to generate a silicon nitride crystal. And after the crystal grows, filling inert gas and slowly cooling to room temperature to finally prepare the complete silicon nitride crystal. The preparation method disclosed by the invention is accurate in process and high in crystal quality, and the prepared silicon nitride crystal has the particle size of more than 500 microns and the purity of more than 5N, and is suitable for the field of application of high-end materials.

The invention provides a positive pole piece, a battery, an energy storage device and electric equipment, the positive pole piece comprises a positive current collector, the surface, deviating from a winding center, of the positive current collector is provided with a first positive material layer, and the surface, facing the winding center, of the positive current collector is provided with a second positive material layer; the average non-sphericity degree of particles of the positive electrode material with the particle size larger than or equal to 1 micron is k1, Dv50 is D1, k1 is larger than or equal to 10% and smaller than or equal to 19%, and D1 is larger than or equal to 0.8 micron and smaller than or equal to 1.2 microns; in the second positive electrode material layer, the average non-sphericity degree of positive electrode material particles with the particle size larger than or equal to 1 [mu] m is k2, Dv50 is D2, k2 is larger than or equal to 21% and smaller than or equal to 35%, and D2 is larger than or equal to 1.2 [mu] m and smaller than or equal to 1.7 [mu] m.

The invention relates to a non-noble metal nano-porous high-entropy alloy catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps that aluminum metal powder and transition metal powder are mixed according to the mass ratio of 1: (0.8-1.5) and smelted at the high temperature, and a smelted metal block is obtained; the obtained smelted metal blocks are smashed, and smelted metal powder is obtained; under the protection atmosphere of inert gas, the obtained smelted metal powder is subjected to ball milling, and ball-milled metal powder is obtained; and the obtained ball-milled metal powder is added into a first solvent, heating and stirring are conducted for a first reaction, and the non-noble metal nano-porous high-entropy alloy catalyst is obtained after separation. The high-entropy alloy is prepared in a high-temperature melting and high-energy ball milling mode, alloying between metals is achieved, the preparation method has the advantages that the preparation method is simple, components are easy to regulate and control, and the atom utilization rate is high, and the obtained high-entropy alloy has extremely high lignin catalytic conversion activity.