165 results about "Ultrafine particle" patented technology

The invention relates to the technical field of filtering devices, in particular to an ultrafine particle filtering device with an automatic deslagging function, which comprises a filtering tank and an internal conical filtering cylinder, the upper end of the filtering cylinder is connected with a liquid inlet pipe, the lower end of the filtering cylinder is communicated with a deslagging pipe, a rotating rod is arranged in the filtering cylinder, and a flow guide wheel is fixed at the top of the rotating rod; when liquid flows in, the flow guide wheel is driven to rotate, the rotating rod is driven to rotate, a first reciprocating spiral guide groove is formed in the outer wall of the rotating rod, and the flow pushing plate moves up and down along the guide groove to push the liquid to turn over, accelerate liquid drainage and avoid particle deposition. An eccentric wheel periodically pushes the lower end of the filter cartridge under the action of a limiting spring seat, a ball head and a limiting plate, so that the filter cartridge generates self-adaptive shaking, filter hole blockage is reduced, the lower end of a rotating rod drives an ejector rod to eject an overturning plate through a second reciprocating spiral guide groove, and deposited impurities are automatically discharged through a slag discharging pipe. According to the device, coordinated actions of plug flow disturbance, shaking and automatic deslagging can be realized by utilizing liquid flow, the filtering efficiency is remarkably improved, and manual cleaning is reduced.

The invention discloses an airflow mixer control system and method based on improved deep reinforcement learning. The method comprises the following steps: S1, forming a complete multi-dimensional process parameter data set by collected operation parameters; s2, performing global search optimization on the mixed parameter space by adopting a collaborative bacterial foraging algorithm; s3, constructing a real-time adaptive control system based on an actor-commentator algorithm; s4, in the actual operation process of the pharmaceutical airflow mixer, continuously collecting real-time multi-dimensional process parameter data, and combining the real-time multi-dimensional process parameter data with the optimal mixing parameter set; and S5, implementing mixing process control according to the real-time adjusted operation parameters of the mixing machine, and achieving a predetermined uniform distribution target of the ultrafine particles. According to the method, the mixing uniformity is dynamically adjusted through the target function enhancement strategy, so that the optimization process is more targeted, feedback optimization is performed by combining a collaborative information sharing mechanism and utilizing data of different mixing batches, and the mixing stability is further improved.

Tantalum powder, comprising pure tantalum powder or tantalum alloy powder, wherein the particle size distribution of the tantalum powder has the following characteristics: (1) Dv90 < 5 μm; and (2) Dv10 > 0.5 μm. The tantalum powder has a narrow particle size distribution and does not contain nanoscale ultrafine particles, and has high stability and a high utilization rate. The present invention further relates to a method for preparing tantalum powder.

The invention discloses high-purity oxamide with concentrated particle size and spherical morphology, a preparation method of the high-purity oxamide and application of the high-purity oxamide in preparation of a slow-release fertilizer, and belongs to the technical field of oxamide synthesis and application. The method comprises the following steps: mixing an ammonia-alcohol solution and an alcohol ester solution, conveying the mixed solution into a series tubular reactor for reaction, and then conveying the mixed solution into a parallel tubular reactor for reaction after pressure stabilization and flow equalization to obtain a reaction solution containing oxamide; performing flash evaporation on the reaction liquid to obtain flash evaporation liquid and flash evaporation gas, and performing solid-liquid separation on the flash evaporation liquid to obtain solid oxamide and filtrate; and drying the solid oxamide to obtain the oxamide. The method realizes high conversion rate and high purity, and the product has ultrafine particle size distribution. The purity of the prepared oxamide is greater than or equal to 99%, the D50 particle size is concentrated to 50 + / -15 microns, the spherical morphology is uniform, the release is stable, and the oxamide has a very good effect in preparation of long-acting slow-release fertilizers and combustion inhibitors and research on the nitrogen utilization rate.

The invention provides a gas disturbance type viscous ultrafine particle fluidization reaction device system and method. The gas disturbance type viscous ultrafine particle fluidization reaction device system comprises a fluidization reaction unit, a gas supply unit, a multidirectional gas supply unit and a gas-solid separation unit, the fluidization reaction unit comprises a reaction cavity, and a gaseous zone and a dense-phase zone are sequentially arranged in the reaction cavity in the axial direction; the gas supply unit is connected with the bottom of the reaction cavity and is used for providing primary gas flow for the dense-phase region; the multidirectional air supply unit comprises an air supply module and a plurality of air supply assemblies, the air supply module is connected with the air supply assemblies, and the air supply assemblies are independently connected with the reaction cavity, communicate with the dense-phase region and are used for providing secondary airflow; and the gas-solid separation unit is connected with the gaseous region. Through reasonable configuration and structural arrangement of the multidirectional air supply units, uniform flowing and gas-solid efficient contact of materials in the fluidization reaction cavity are realized, and the problems of particle agglomeration and channeling are solved.

The invention relates to the technical field of cutting fluid separation and filtration, and discloses mist separation and filtration equipment for cutting fluid for photovoltaic silicon wafer production, which comprises a rack, a centrifugal tank body, a feeding shaft, a servo motor and a filter cartridge, a locking sleeve is installed on the feeding shaft, a plurality of fixed sleeves are fixedly installed on the locking sleeve, a sliding shaft body in sliding connection with the inner wall of each fixed sleeve is installed in the corresponding fixed sleeve, an annular disc frame is fixedly installed on each sliding shaft body, and a plurality of intercepting components are arranged between the annular disc frames and the fixed sleeves; according to the mist separating and filtering equipment for the cutting fluid for photovoltaic silicon wafer production, flow field parameters can be effectively changed by dynamically adjusting the radius of the intercepting part, optimization treatment on oil mist with different concentrations is achieved, the particle residence time can be prolonged through the intercepting part, and therefore collision polymerization between superfine particles and large particles is facilitated; therefore, the large particles can carry the superfine particles to be in contact with the filter cartridge, and are separated and filtered under the action of the filter cartridge.

The invention discloses a sponge city seepage and drainage structure and a sponge city water circulation system, and relates to the technical field of sponge city construction. A capillary air flotation grading pretreatment unit, a rhizosphere electro-catalysis layer and a mineral conversion filler layer are sequentially arranged below the permeable pavement layer in the rainwater permeation direction, and the drainage layer is a piezoelectric drainage layer; according to the method, blockages are subjected to capillary air flotation classification, minerals are converted into purification carriers, solid waste outward transportation is avoided, and heavy metal pollution is prevented; the water circulation end depends on photovoltaics, an external power grid is not needed, and carbon is reduced; sensor linkage adapts to a purification mode of high / low-pollution rainwater, and a straw self-cleaning function at the seepage and drainage end is prevented from being interrupted; the magnetic sensitive medium is prepared by converting blockages, outsourcing is avoided, and the cost is reduced; the ultrafine particles in the by-products assist in purification, the uleucite is used for preparing the pervious concrete, and the zeolite is used for improving the soil, so that environmental protection and resource regeneration are realized.

The invention relates to a method for preparing nano graphene and a composite material thereof at low temperature. The method is mainly realized by taking metal oxide or metal salt powder as a precursor and carbon-containing gas as a carbon source and combining means such as a plasma enhancement technology. Firstly, a precursor is placed in a vacuum furnace; then vacuumizing to a background; introducing a certain proportion of carbon source gas and auxiliary gas, and keeping the gas pressure at 10-5000 Pa; performing plasma treatment on the gas in the furnace in a certain manner; raising the temperature to 150-500 DEG C at a certain heating rate, and keeping the temperature for a period of time; and then closing the carbon source gas, stopping plasmatization, and cooling to room temperature to prepare the nano graphene and the composite material thereof. The method has the advantages that the growth temperature of the graphene is low (can be as low as 150 DEG C), and the nano graphene with the superfine particle level (1-10 nm) and the graphene / metal particle composite material perfectly coated with the graphene can be prepared.

The invention relates to the technical field of air purification, and discloses a space air particle differentiation system and a control method thereof.The space air particle differentiation system comprises an air particle separation module and a control module, the air particle separation module comprises an air inlet, a cyclone separation barrel and a detachable dust collection barrel, the cyclone separation barrel separates particles in air through centrifugal force classification, and the separated particles fall into the bottom dust collection barrel; the ultraviolet catalysis module comprises an ultraviolet reaction chamber, the inner wall of the ultraviolet reaction chamber is coated with a photocatalyst, and a UV-C light source is configured and used for decomposing organic pollutants and microorganisms; the electron-ozone reaction module comprises a mixed flow pipeline fan and an exhaust port, the mixed flow pipeline fan forms negative pressure airflow in the system, and purified air is exhausted through the exhaust port. Through cooperation of cyclone separation, ultraviolet catalysis and electron-ozone reaction, large particles are removed through cyclone separation, organic matter is decomposed through ultraviolet catalysis, microorganisms and superfine particles are oxidized and decomposed in a reaction chamber through electron flow and ozone, the maintenance period is prolonged, and efficient consumable-free purification is achieved.

The invention is a device for forced agglomeration of dry solid particles in a gas flow. The device can be applied in a short section of the duct with contaminated gas. The device for agglomeration of ultrafine particles comprises a T-shaped acoustic chamber and an ultrasonic generator attached to it. An ultrasonic generator is exposed to a volume of gas flow that flows perpendicular to the direction of propagation of the ultrasonic waves of the ultrasonic generator.

The invention discloses a particle detection device. The particle detection device comprises a light source, a sample cell, a light beam collection unit, a dichroscope, a first photoelectric detection unit, a second photoelectric detection unit and a processing unit, the sample pool comprises a fluorescent liquid path inlet, a sample liquid path inlet and a liquid path outlet; the light source emits an illumination light beam to the sample cell to generate scattering fluorescence and scattering signal light, the scattering fluorescence is output to the first photoelectric detection unit, and the scattering signal light is output to the second photoelectric detection unit; the processing unit detects and counts the particles to be detected according to the electric signal of the second photoelectric detection unit, and corrects the measurement result according to the number and the particle size of the fluorescent particles and the electric signal of the first photoelectric detection unit. The fluorescence detection light path is added into the conventional light scattering light path, the state of the light scattering light path is monitored in real time, and auxiliary information is provided for a light scattering signal processing algorithm by using a fluorescence signal waveform, so that the detection precision is improved, and detection and counting of ultrafine particles in liquid are realized.

Method and apparatus to enable detection, count, and recordation of properties of particles of ultrafine particle sizes (<0.1 micron) as well as particle of larger sizes with the use of a condensation nuclei counter configured to enable multiple stages of volume expansion with the use of an array of fluidly connectable chambers.

The utility model discloses a concrete waste slurry water recycling device which comprises a bin body, the top of the bin body is arranged at the horizontal position of the ground, a notch is formed in the top of the bin body, the bin body communicates with the screening bin, and a vibrating screen is arranged in the screening bin and connected with a motor; the lower portion of the screening bin is connected with a lifting pipe, the lifting pipe is connected with a separator, the lower portion of the separator is connected with an inlet pipe, and the inlet pipe is connected with a storage tank. Concrete waste slurry is subjected to three-stage separation, coarse particles, sand and the like are subjected to primary separation through filtration, a mixture of fine particles and water is subjected to secondary separation through vibration, finally, superfine particles which cannot be separated from the slurry are subjected to three-stage separation through a centrifugal machine, and recycling and reusing are facilitated.

The invention discloses a silicon wafer ultrafine particle cleaning optimization method, and particularly relates to the field of semiconductor cleaning processing, and the method comprises the following steps: S1, optimizing a cleaning process; s2, improving equipment and an operation mode; and S3, improving environmental conditions. According to the silicon wafer superfine particle cleaning optimization method, through the synergistic effect of optimizing the cleaning process, improving the equipment and the operation mode, improving the environmental condition and the like, the cleaning capacity of small particles smaller than 0.16 micron on the surface of the silicon wafer can be effectively improved, the silicon wafer cleaning effect and quality are improved, and the silicon wafer cleaning quality is improved. The high-precision requirement of the semiconductor manufacturing process is met, the product cleaning capacity is precisely improved by adopting proper cleaning liquid and proportion and controlling the cleaning time and temperature, and the expected high standard specification is achieved by using advanced cleaning equipment and optimizing and standardizing the operation process. A high-standard production environment is achieved by improving environmental conditions and combining with parameters such as the environment control temperature, humidity and pressure of a clean room.

The invention relates to a small hybrid coagulated particle counter and a working method thereof. The condensed particle counter comprises a particulate matter adjusting unit, a hot steam saturation unit, a particulate matter and steam mixing unit, a particulate matter growth unit, an optical detection unit and a signal processing and control unit. To-be-detected ultrafine particles pass through the particle adjusting unit for adjusting the flow rate and reducing the temperature, are fully mixed with alcohol steam flowing into the hot steam saturation unit in the particle and steam mixing unit, and then absorb moisture in the particle growth unit to increase to an optically detectable size; and the measured diameter of the particulate matter is converted into an optical pulse signal by the optical detection unit, so that the number concentration of the to-be-measured ultrafine particulate matter is obtained. The device has the advantages of fast and sufficient mixing speed of particulate matters and hot steam, small particulate matter loss and the like, and has good performance in the aspects of dynamic detection, high-flow-speed operation and extremely-small-particle-size particulate matter capture while reducing the equipment volume and realizing portability.

The invention relates to an ultrafine particulate matter cell exposure observation system and method for simulating human respiration based on planar waveguide dark field microscopic imaging. The system comprises a particulate matter generation module, a humidity regulation and control module, a cell exposure module, a dark field microscopic imaging module and a data acquisition and processing module. The method comprises the steps of particulate matter generation, humidity adjustment, cell exposure, dark field microscopic imaging, acquisition, data recording and the like. According to the invention, high-efficiency imaging and quantitative observation of cells on specific humidity and particulate matter exposure response can be realized in a simulated human respiration environment. According to the invention, high-stability and low-interference particulate matter exposure is carried out on cells in a simulated human respiration environment, high-contrast dark field imaging and image recording are synchronously completed, and the system has the remarkable advantages of high integration level, high stability, excellent imaging quality and the like.

The invention relates to the technical field of gas purification, and discloses a low-energy-consumption desulfurization method which comprises the following steps: (1) contacting acidic gas with foaming liquid in a microbubble generator to generate microbubbles, so as to obtain a gas-liquid mixture; wherein the foaming liquid comprises ultrafine particles and a complex iron desulfurization liquid I, and the particle size of the ultrafine particles is 10-100 microns; (2) performing reverse contact on the mixture and the complexing iron desulfurization liquid II in an absorption tower, and performing oxidation-reduction reaction to obtain purified gas and desulfurization rich liquid; (3) carrying out oxidation regeneration on the desulfurized rich solution and air in an oxidation regeneration tank to obtain regenerated gas, regenerated barren solution and regenerated sulfur slurry; (4) separating the regenerated sulfur slurry in a separator to obtain sulfur and filtrate; and returning the regenerated barren liquor and / or filtrate to the absorption tower for recycling. According to the low-energy-consumption desulfurization method provided by the invention, the bubble effect of the microbubble generator can be improved, the impact energy consumption of the microbubble generator can be reduced, the mass transfer efficiency of the absorption tower can be improved, and the desulfurization energy consumption can be reduced.

The invention relates to a method and a system for integrally removing greenhouse gas and particulate matters in ship tail gas based on an alkaline adsorption technology. The method comprises the following steps: firstly, cooling the ship tail gas until water vapor is in a supersaturated state; spraying and mixing with an alkaline solution, and removing dust and particulate matters from the obtained gas phase; mixing the obtained liquid phase with an alkaline reagent, and filtering to obtain a solution in which the greenhouse gas is dissolved; the system comprises a heat exchanger, a decarbonization tower, dust removal equipment and a precipitation cabinet, the heat exchanger is connected with a ship tail gas exhaust pipe and used for cooling ship tail gas till steam is in a supersaturated state. The decarburization tower is used for spraying and mixing the cooled ship tail gas and an alkaline solution to obtain a gas phase and a liquid phase; the dust removal equipment is communicated with a gas phase outlet of the decarbonization tower and is used for removing particulate matters in a gas phase; and the precipitation cabinet is communicated with a liquid phase outlet of the decarbonization tower. Compared with the prior art, greenhouse gas and particulate matters, especially ultrafine particulate matters, in the tail gas of the marine diesel engine can be removed at the same time.

The invention provides a preparation method of nano vanadium dioxide. According to the preparation method, a sol-gel method and a micro-scale confinement space reaction are combined, the sol-gel method can realize uniform mixing of raw materials in a liquid phase, a stable sol system is formed through hydrolysis and condensation chemical reactions, and the micro-scale confinement space reaction limits nucleation and growth processes through a micro-nano-scale physical space, so that the micro-scale confinement space reaction is formed. According to the preparation method, the material is subjected to'guiding 'growth, vanadium ion form transformation and ultrafine particle nucleation growth can be realized in one step, preparation of nano powder with given structural characteristics is realized, meanwhile, the phenomenon of product agglomeration is avoided, and the powder prepared by the process method is relatively high in particle size controllability and good in dispersity.

The application discloses a system for preventing agglomeration of superfine powder, which comprises a charge chamber arranged in a gas-phase dynamic mill, a first ion generator for conveying first ions into the charge chamber to form an electric environment of the first ions in the charge chamber, and a second ion generator for conveying second ions with opposite electric properties to the first ions into a falling area through which the large particles fall. When the powder passes through the charge chamber, the powder particles carry the first ions and have the same electric properties, so that the agglomeration of the powder particles can be avoided according to the principle of repulsion between same properties. The first ions on the falling large particles are neutralized by the second ions, so that the large particles become uncharged particles and directly fall into a supersonic airflow input area for further crushing. The system can prevent the superfine particles from being too close to each other to generate force and adsorption force by using the repulsive force of the same electric charges, so that the dispersion degree of the superfine particles is improved and the agglomeration of the superfine particles is prevented.

The invention relates to the technical field of dust removers, in particular to a gas distribution device for removing superfine particles based on wet electric precipitation. Comprising a support, a dust remover shell and a purifier communicated with the top of the dust remover shell, a dust collection hopper is arranged at the bottom of the support and communicated with a dust and gas inlet and a discharging pipe, a plurality of dust collection plates and discharging polar plates which are alternately arranged are arranged on the support in a horizontal transverse array mode, and a circulating liquid supply device is arranged on the top of the support. The circulating liquid supply device is used for forming a continuous water film from top to bottom on the surface of the bracket so as to wash the captured particulate matters. The flow limiting plate is promoted to reciprocate through periodic rotation of the cam, so that the size of the cross section of the water film channel is changed, dust attached to the dust collecting plate is scoured in a pulse mode, attachment of particles to the dust collecting plate is reduced, and the purification effect on the particles is improved.

This invention discloses an ultrafine particle soil fluidized solidifier and an intelligent pile-forming process for in-situ pre-mixed fluidized solidified soil. The solidifier comprises cement, granulated blast furnace slag powder, and other main solidifying materials, along with an organic polymeric dispersant. Through the action of a low dosage of the organic polymeric dispersant, the plastic-to-fluid transition of the cohesive solidified soil is achieved, solving the technological challenges in preparing ultrafine particle fluidized solidified materials with high dosage, low moisture content, and high strength. An innovative airtight construction process is proposed. By introducing a pressurized airflow during mixing, the gas phase space of the ultrafine particle fluidized solidified material is increased, providing space for the growth of hydration product crystals and suppressing the strength-reducing effect of the organic polymeric dispersant on the solidified soil. This achieves rapid mixing of the solidifying material and the solidified soil, significantly improving the construction efficiency of in-situ soil solidification.

The image forming apparatus includes: a fixer that heats and fixes a toner image formed on a continuous medium; a collector that collects ultra fine particles generated from an elastic member included in the fixer; an air blower that generates an air current toward a side of the collector; and a hardware processor that varies an output mode of the air blower according to at least one of an apparatus state of the image forming apparatus and / or a printing condition for the image forming apparatus.

The invention relates to a preparation method of a superfine-particle-size NTC thermistor material, the material is a Ni-Cr-Fe-Mn-Co-O five-element system, NiO, Cr2O3, Fe2O3, MnO2 and CoO are selected as oxide raw materials, preliminary mixing and grinding treatment are performed, then drying and presintering are performed, secondary ball milling is performed to further refine powder particles, and the superfine-particle-size NTC thermistor material is obtained. The obtained thermistor powder has an ultrafine particle size (D50 is less than or equal to 1 [mu] m) and a high particle size distribution concentration ratio (D90-D10 is less than or equal to 2.04 [mu] m). The method provided by the invention has the characteristics of simple process, short preparation period, small material loss, wide raw material source, low cost and the like, and is easy to realize large-scale production. The NTC thermistor product prepared from the material prepared by the method disclosed by the invention has the advantages of high sensitivity, obvious negative temperature coefficient (B value is up to 4000 or above), and good thermal stability and consistency.

The invention relates to a multi-section tandem fluidized bed reaction system in the technical field of gas-solid fluidized beds. The multi-section tandem fluidized bed reaction system comprises a gas-solid separation area, a multi-section tandem reaction area and a solid material receiving and circulating area which are sequentially communicated from top to bottom, a reactor and a stocker which are connected from top to bottom are arranged in a segmented reaction area of the multi-segment tandem reaction area, a distributor is arranged in an inner cavity of the reactor, a material disperser is arranged at the bottom of the reactor, a coated raw material feeding line is connected to the side wall of the distributor, and a loose air feeding line is connected to the bottom of the stocker; according to the invention, the problems of short retention time of a single reactor, incapability of continuously supplementing heat for solid particles and the like in a C-type ultrafine particle fluidized bed CVD coating technology are solved, repeated relay coating under the condition of the same raw material and multi-layer coating of different raw materials under the condition of one-time passing can be realized, the yield and the yield of a target product are favorably improved, and the production cost is reduced. The operation stability of a fluidized bed reaction system is improved, and equipment investment and dust pollution are reduced.

The present invention relates to a system and method for preparing graded ultrafine particles using a highly elastic material, comprising the following steps: pre-expanding coarse particles of the highly elastic material using high-pressure gas to obtain expanded material coarse particles; surface-modifying the expanded material coarse particles to obtain modified coarse particles; suspending the modified coarse particles in a liquid and shear-crushing them to obtain ultrafine mixed particles; and grading the ultrafine mixed particles to obtain graded ultrafine particles. The present invention utilizes high-pressure gas permeation expansion to produce ultrafine particles, achieving a uniform particle size distribution after crushing. This method eliminates the need for ultra-low temperature cooling, such as with liquid nitrogen, and effectively reduces energy consumption. The surface of the highly elastic material is modified to enable suspension in a liquid, facilitating efficient, constant-temperature, and continuous high-shear crushing at temperatures below the material's failure point.

The invention relates to the technical field of intelligent fire fighting, and discloses an intelligent fire fighting platform multi-equipment information fusion early warning method and system, and the method comprises the steps: continuously collecting the data of detection equipment in a clean room of a semiconductor manufacturing factory, and presetting and storing an abnormal signal sequence template containing ultrafine particles, chemical activity monitoring and traditional fire features; and early recognition of the atypical dangerous events is realized. According to the method, a real-time detection equipment data sequence is compared with an abnormal signal sequence template, the matching degree is obtained, and when the matching degree reaches a preset threshold value, it is judged that an atypical dangerous event exists, and early warning information is generated. According to the invention, the identification capability and the early warning timeliness of the intelligent fire-fighting platform on atypical dangerous events in high-risk environments such as semiconductor manufacturing factories can be obviously improved, and the equipment safety and the personnel health are effectively guaranteed.

This invention discloses a system and method for treating ultrafine particulate matter and sticky dust in waste incineration flue gas, relating to the field of flue gas purification. In the first treatment zone, the surface charge of the particulate matter in the flue gas approaches the isoelectric point. When the flue gas enters the second treatment zone, the particulate matter undergoes a bridging and agglomeration reaction, increasing the particle size. When the flue gas enters the third treatment zone, the surface of the particulate matter undergoes chemical hydrophobic modification, increasing the hydrophobic angle of the particle surface. This invention, through the first, second, and third treatment zones, agglomerates submicron-sized ultrafine particulate matter that is difficult to capture into micron-sized large particles that are easy to capture, improving dust removal efficiency and solving the problem of low capture efficiency of ultrafine particulate matter in traditional bag filters.

The invention belongs to the technical field of radiochemistry, and particularly relates to a nanofiber filter membrane as well as a preparation method and application thereof. The electrostatic spinning technology is adopted, and the nanofiber filter membrane which is uniform in structure, fine in fiber and free of defects is prepared. By regulating and controlling spinning conditions, optimal fiber diameter distribution is obtained, no spindle exists, and the mechanical property of the filter membrane is improved while the trapping efficiency of the filter membrane on ultrafine particles is improved. The obtained nanofiber filter membrane can keep mechanical stability and low resistance while capturing superfine radioactive particles, the average diameter and the pore diameter of nanofibers are extremely small, the nanofiber filter membrane has a larger comparison area and a porous structure, a large number of contact sites can be provided, and especially the nanofiber filter membrane has excellent capturing efficiency on superfine particles smaller than 100 nm.

The invention belongs to the technical field of metallurgy, and particularly relates to superfine particle tungsten carbide powder and a preparation method and application thereof.The preparation method comprises the following steps that S1, carbon paste, hydrochloric acid and an ammonium tungstate solution are obtained, the carbon paste and the hydrochloric acid are subjected to first ultrasonic stirring, and a first mixed solution is obtained, performing second ultrasonic stirring on the ammonium tungstate solution and the first mixed solution to obtain a second mixed solution, washing the second mixed solution with pure water, and drying to obtain a tungstic acid and carbon precursor mixture; s2, calcining the tungstic acid and carbon precursor mixture to obtain a tungsten oxide and carbon mixture; s3, the tungsten oxide and carbon mixture is subjected to first carbonization, crushing and sieving, and first tungsten carbide powder is obtained; and S4, the first tungsten carbide powder is subjected to carbon blending to obtain second tungsten carbide powder, and the second tungsten carbide powder is subjected to second carbonization, crushing and sieving to obtain the ultrafine particle tungsten carbide powder. According to the preparation method, the ultrafine particle tungsten carbide powder with the specific surface area of 2.0-3.0 m < 2 > / g, the combined carbon content of 6.10-6.11 wt% and the free carbon content of 0.03-0.04 wt% is prepared by adopting carbon thermal reduction and step-by-step carbonization.