2570 results about "Small particles" patented technology

The invention relates to the technical field of gangue filling, in particular to a coal mine gangue roadway type filling method which comprises the following steps: (1) screening gangue, and classifying the gangue into corresponding particle size groups according to particle sizes; (2) designing grading schemes according to the particle size groups divided in the step (1), performing simulation by using PFC2D numerical simulation software to obtain stress-strain curves of the grading schemes, and selecting the grading scheme with the maximum peak stress as the optimal grading scheme; and (3) filling the roadway type filling area according to the optimal grading scheme determined in the step (2). According to the method, the optimal grading scheme is determined by simulating the stress damage process of the internal structure of the original waste rock filling body under different particle size grading schemes through PFC2D, simulation verification shows that the stress concentration condition of the left side and the right side of the filled roadway is improved, the filling body filled in the roadway can replace roadway surrounding rock to bear part of pressure, and the working efficiency is improved. The problem that the crushing pressure is large when small-particle gangue is used in the prior art is solved.

The present invention discloses a PHA / PVA nanoscale paper-based barrier emulsion, and its preparation method and application. The aqueous emulsion comprises PHA particles with an average particle size of 100 nanometers to 300 nanometers and PVA, wherein PHA and PVA are blended in a specific ratio, and PVA is blended with PHA as the main film-forming component and barrier performance contributing component to form the nanoemulsion. The preparation method comprises mixing PHA particles with an initial average particle size of 1 micron to 100 microns with a PVA aqueous solution, and processing the nanoemulsion by nano-processing means such as high-pressure homogenization. The emulsion can be applied to paper-based materials, such as paper and cardboard surfaces, and forms a barrier coating after drying. The emulsion obtained by the present invention has small particle size, good stability, good leveling properties, and is easy to form a uniform and dense barrier film on the paper base. The film has excellent water vapor, oxygen and grease barrier properties, and the material is bio-based, biodegradable, and environmentally friendly.

The invention discloses a method for preparing nano barium titanate based on sol-gel synergistic hydrothermal reaction, which comprises the following steps: (1) dissolving barium acetate in an acetic acid aqueous solution to obtain a barium source solution; weighing tetrabutyl titanate according to the molar ratio of barium to titanium being greater than 1.25, and dissolving the tetrabutyl titanate in alcohol to obtain a titanium source solution; (2) uniformly mixing the barium source solution and the titanium source solution, preserving heat at 20-80 DEG C to obtain gel, drying and grinding to obtain white powder of the barium titanate precursor: (3) preparing a 2-4mol / L inorganic strong alkali aqueous solution, adding the white powder and a dispersing agent into the inorganic strong alkali aqueous solution, and fully stirring to obtain a barium titanate precursor suspension; and (4) transferring the barium titanate precursor suspension into a reaction kettle for hydrothermal reaction, and after the reaction is completed, washing, drying and grinding to obtain the nano barium titanate powder. The preparation method is low in cost, and the prepared nano barium titanate powder is uniform in distribution, spherical or sphere-like in morphology, small in particle size, 80-150nm in average particle size and good in particle crystallinity.

The invention discloses injectable cross-linked hyaluronic acid gel containing hydroxyapatite microspheres as well as a preparation method and application of the injectable cross-linked hyaluronic acid gel containing the hydroxyapatite microspheres, and the preparation method comprises the following steps: step 1, adding a cross-linking agent and the hydroxyapatite microspheres with the crystallinity of 60-90% into a hyaluronic acid HA solution, cross-linking to obtain composite gel, and cutting the composite gel through a 60-100-mesh screen to obtain large gel particles; 2, a cross-linking agent and hydroxyapatite microspheres with the crystallinity being 30%-60% are added into the HA solution, composite gel is obtained after cross-linking, and the composite gel is cut through a 140-200-mesh screen to obtain small gel particles; and step 3, adding the large gel particles and the small gel particles into the non-crosslinked HA solution, and uniformly mixing to obtain the injectable crosslinked hyaluronic acid gel containing the hydroxyapatite microspheres. The composite gel obtained by the invention has a continuous collagen regeneration promoting effect, the in-vivo effect maintenance time is prolonged, and the composite gel has an excellent soft tissue filling and repairing effect.

The invention discloses a preparation process of acellular matrix particles, and relates to the technical field of biomedical material processing. The invention provides an acellular matrix particle preparation process based on a biological enzyme method and a fluidized bed principle. The acellular matrix particle preparation process comprises the following steps: alkali treatment, acellular dehydration, grinding and screening. The step of screening is based on the fluidized bed screening principle, the acellular matrix particles are input into a fluidized bed layer, the particles suspended on the fluidized bed layer can settle rapidly under the action of fluid, and the particles with small particle sizes can rise along with the fluid and enter a discharging system. The preparation process can realize accurate screening of acellular matrix particles, significantly reduce the particle size fluctuation range, can directionally prepare particles in a specific particle size interval, and has the characteristics of high efficiency, continuous production, simple operation and strong applicability.

The invention discloses a machine-made sand grading calculation method based on a double-vision compensation algorithm, and relates to the technical field of computer vision. According to the invention, through a compensation algorithm combining global and local images, the stability problem of small-particle-size particles is effectively solved. The global image provides distribution information of the whole sand grains, the local image can accurately capture details of the small grains, the instability of the small-grain-size grains is compensated through an algorithm, and the stability and the accuracy of a measurement result are ensured; according to the method, errors caused by particle shape irregularity are overcome, the mass of the particles is measured through experiments, the equivalent height is calculated by combining the projected area and density of the particles, and the method effectively avoids volume calculation deviation caused by the particle shape irregularity.

The utility model relates to the technical field of ore extraction, in particular to an ore extraction device which comprises a base of a whole device carrier, a crushing mechanism used for crushing ore is arranged on the base, a flotation tank used for separating metal substances is arranged on the base, and the base is further provided with a material distributing assembly used for expanding the discharging range. The crushing mechanism comprises a ring body rotationally installed on the base, a grinding roller rotating in the direction opposite to the ring body is further installed on the base, the diameter of the grinding roller is gradually increased from top to bottom, crushing teeth are fixedly connected to the inner ring of the ring body and the outer ring of the grinding roller, and the ring body is arranged outside the grinding roller in a sleeving mode. The crushing mechanism is arranged, the grinding roller and the ring body rotate in opposite directions, ore can be crushed through the crushing teeth, the grinding roller is in the shape of a circular truncated cone, the ore can be crushed step by step, raw materials can be decomposed into small particles, the mechanical stone crushing process can be conducted more easily and efficiently, and the crushing efficiency is improved. And the overall crushing efficiency is improved.

The utility model provides an adsorption device for wafer processing, a wafer grinding device and wafer thinning equipment. The adsorption device comprises an adsorption plate, a suction cup, a through-flow shaft with an axial through hole and a mounting seat, and the adsorption plate is arranged in a containing cavity of the suction cup; the through-flow shaft passes through the binding surface between the mounting seat and the suction cup and extends into the suction cup, so as to avoid the binding surface between the suction cup and the mounting seat to suck fluid from the suction cup for wafer adsorption or input fluid into the suction cup for wafer release; the suction cup is provided with a fluid channel in fluid communication with the containing cavity, and the axial through hole is in fluid communication with the adsorption plate through the fluid channel. According to the technical scheme, the fluid path for vacuum adsorption or release of the wafer avoids the binding face between the suction cup and the mounting base, small particles are prevented from entering the binding face along with the fluid, the clean and tight binding state between the suction cup and the mounting base is guaranteed, the wafer grinding accuracy is guaranteed, and the wafer grinding quality is improved.

The invention relates to the technical field of jet milling, in particular to a jet milling control method for a fluidized bed jet mill. The method comprises the following steps: acquiring the scattered particle weight increment of large particles and the fine weight increment of fine particles between adjacent sampling moments; dividing into an initial increasing stage and a uniform increasing stage according to the numerical value change of the weight increment of the scattered particles at the maximum value position; in the initial increasing stage, the retention degree is determined according to the trend change of the small weight increment; the drag force degree is determined according to the numerical comparison of the fine weight increment and the granular weight increment in the initial increasing stage and the uniform increasing stage; and determining an adjustment coefficient of the jet milling pressure by combining the retention degree and the drag force degree at the current moment, and regulating and controlling the jet milling pressure at the current moment according to the adjustment coefficient. The airflow crushing pressure can be adjusted and controlled more objectively and reasonably, and the airflow crushing efficiency is effectively improved.

The present invention belongs to the technical field of petroleum fracturing production enhancement and modification, and specifically discloses a fracturing fluid pre-fluid for optimizing the size of in-situ autogenous proppant and its application, which is used to solve the problem of small particle size of proppant particles generated by hydrothermal reaction of formation minerals. The fracturing fluid pre-fluid is suitable for calcium-rich reservoirs and is composed of clean water, phosphate, pH regulator and Ca 2+ The chelating agent composition comprises 1 to 10 parts by weight of phosphate relative to 100 parts by weight of clean water, a volume molar concentration of the pH regulator is 1 to 5 mol / L, and Ca 2+ The molar concentration of the chelating agent is 0.001~1mol / L; the pH regulator is urea, ammonia, propionamide, etc. 2+ The chelating agent is EDTA, glutamic acid, etc. The present invention increases the average particle size of proppant particles generated by hydrothermal reaction of formation minerals, thereby improving the supporting effect thereof in micro-fractures of the formation.

The invention discloses a preparation method of a lithium iron phosphate positive electrode material, three iron sources with different forms and different particle sizes participate in preparation of the lithium iron phosphate positive electrode material, and gradation is formed to improve the compaction density and rate capability of the material. The EDTMPA reduces the viscosity of the slurry, is anchored on the surface of FePO4 particles through strong adsorption, inhibits particle aggregation through steric hindrance and electrostatic repulsion effect, and introduces hydrophilic groups to enhance wettability, reduce the viscosity of the system, optimize dispersion stability, accelerate particle crushing and refining, reduce the particle size and shorten the grinding time; in the sintering process, a reducing agent is generated through pyrolysis to inhibit too fast oxalic acid decomposition to cooperate with the generated reducing gas, Fe < 3 + > is completely reduced, the reduction temperature is reduced to inhibit grain growth, and the grading effect between large and small particles is improved; in addition, an N-doped carbon coating layer is formed through high-temperature cracking, pores are filled with residual carbon generated through decomposition of ferrous oxalate, the coating density is improved, the carbon-coated graphitization degree is improved, and then the electronic conductivity and the rate capability of the material are improved.

The present invention provides a class of ultra-high molecular weight polyethylene microparticles having a small particle size and a low bulk density. Specifically, the present invention provides microparticles having the following characteristics: (a) a viscosity-average molecular weight in the range of 1 million to 5 million; (b) at least 90% by weight passing through a 100-mesh sieve; a particle median diameter (d50) of 40 μm < d50 < 80 μm; and (c) a powder bulk density of 0.25 to 0.33 g / cm 3 The ultra-high molecular weight polyethylene particles provided by the present invention are suitable for producing microporous filter materials.

The invention relates to a glabridin self-assembly inclusion with an ultra-small particle size as well as a preparation method and application thereof, and belongs to the technical field of cosmetics. The composition disclosed by the invention is prepared from the following components in parts by weight: 0.5 to 5 parts of glabridin, 10 to 30 parts of polyhydric alcohol, 0.4 to 6.5 parts of liquorice root carrier component, 1.5 to 3 parts of nonionic emulsifier A, 0.45 to 1.8 parts of nonionic emulsifier B and 53.7 to 87.15 parts of water, the liquorice carrier component comprises at least one of glycyrrhizic acid, ammonium glycyrrhizinate and glycyrrhetinic acid; the nonionic emulsifier A is a nonionic emulsifier of which the hydrophilic-lipophilic balance value HLB is greater than 9; and the nonionic emulsifier B is a nonionic emulsifier with a hydrophilic-lipophilic balance value HLB of 2-4. The glabridin self-assembly inclusion disclosed by the invention is smaller in particle size, good in wrapping performance and good in targeting property; the stability is good, glabridin wrapping does not separate out, and the transdermal absorption rate is higher.

The invention provides an optimization method of a magnesium slag sensible heat recovery system, which comprises the following steps: acquiring particle size distribution data of magnesium slag particles, and judging whether the problem of non-uniform particle size distribution exists or not according to a preset particle size threshold value; aiming at the problem of non-uniform particle size distribution, magnesium slag particles are classified by adopting a clustering algorithm, and the distribution areas of large particles and small particles are determined; according to the distribution area of the large particles, the rotating speed of the cooling roller is dynamically adjusted, and the accumulation probability of the large particles in the roller is reduced; the temperature change trend of the inner wall of the cooling roller is monitored in real time, and if it is detected that the local temperature abnormally rises, it is judged that local hot spots exist; when a local hot spot is detected, a spraying cooling system in the roller is started, and intensified cooling is conducted on a local area; pressure and temperature data of high-pressure and high-temperature water are collected in real time through a pressure sensor and a temperature sensor, and whether fluctuation exists or not is judged.

The invention discloses a preparation method of monodisperse nano cerium oxide, and relates to the technical field of rare earth materials. The preparation method of the nano cerium oxide comprises the following steps: S1, adding hydrogen peroxide and a surfactant into a cerium salt solution, and uniformly stirring and mixing to obtain a pre-solution; s2, the pre-solution is adjusted to be in an alkaline environment through an alkaline solution, stirring is conducted for 0.5-1.5 h at the temperature of 60-90 DEG C, slurry is obtained, then suction filtration, washing, drying and calcination are conducted, and cerium oxide powder is obtained. The prepared nano cerium oxide particles are small in particle size, narrow in particle size distribution range and good in dispersity.

The invention discloses a multi-stage coupling jet enhanced shear mixing aeration system and an application method thereof. The aeration system comprises an air inlet section, a liquid inlet section, a bubble generator connected to the common downstream of the air inlet section and the liquid inlet section, and a regulating valve and an aeration tank which are sequentially connected to the downstream of the bubble generator, the bubble generator sequentially comprises a gas-liquid mixing unit, a rotational flow shearing unit, a turbulence strengthening unit and an oscillation self-excitation unit from upstream to downstream; according to the invention, negative pressure air suction, vortex shearing, hydrodynamic cavitation effect and the like are integrated in a device without a moving part; the gas-liquid mixture is crushed into nanoscale bubbles at the tail end turbulence section; the method has the remarkable advantages of lower energy consumption, higher bubble nucleation rate, smaller particle size and more uniform distribution. In addition, due to the unique multi-flow-field coupling design, adaptability to different water qualities is higher, and stable and efficient nanobubble generation capacity can be kept under wider working conditions.

The invention discloses a semi-autogenous mill crushing capacity evaluation method based on DEM simulation, and relates to the technical field of mineral processing, and the method comprises the following steps: measuring discrete element calculation required parameters of ores, steel balls and lining plate materials, and establishing a semi-autogenous mill geometric model; importing a geometric model of the semi-autogenous mill, and initializing discrete element calculation required parameters and particle processing parameters; a DEM simulation experiment is carried out, when simulation time reaches integral multiples of the step length, all particle information in a simulation system is traversed, particles meeting the judgment condition are removed, the mass of removed ore particles is obtained, new particles meeting the set condition are added, abnormal particles are processed, and the ore particles are obtained. The residual mass of the ore particles with the particle size set by the system within the simulation time and the mass of the removed ore particles at each moment are obtained, the removal rate of the ore particles at each moment in the simulation process is calculated, the crushing capacity evaluation result of the semi-autogenous mill is obtained, the evaluation calculation time is short, the accuracy is high, and the problem of small particle deposition is effectively solved.

The invention discloses a device and a method for regenerating a powdery iron oxyhydroxide desulfurizer and purifying sulfur, and the device and the method are characterized in that invalid iron oxyhydroxide is completely reduced into a ferrous oxide and ferrous sulfide after sulfide is added, the reaction of an iron compound is enhanced through ultrasound and stirring, and the separation of the iron compound and the sulfur is promoted. Further fully aerating to fully oxidize the ferrous iron to generate new iron oxyhydroxide; at the moment, the iron oxyhydroxide is in a completely dispersed state, the single particle size is not higher than 1 micron, and small flocs with the particle size of 0-5 microns are formed in laminar water; the surface of the sulfur has hydrophobicity, and the sulfur is gathered to generate hydrophobic self-flocculation, so that large flocs with the particle size of 30-300 microns are formed in the laminar water; the mixture is flushed by water flows with different flow speeds, the iron oxyhydroxide with small particle size is flushed out at a certain flow speed, and the sulfur with large particle size is suspended in the grading pipe, so that the regeneration of the iron oxyhydroxide desulfurizer and the purification of the sulfur are realized.

The invention relates to a solid-liquid mixture particle screening, grading and applying device, and belongs to the technical field of soil treatment. The device comprises a screening box body with an inlet and an outlet, multiple stages of screening mechanisms are sequentially arranged in the box body, and each stage comprises an inclined screening plate and a driving assembly; the sieve plate is linked with the swing connecting rod through the eccentric wheel to achieve digging, transporting and throwing actions, the sizes of meshes are gradually reduced to separate particles with different particle sizes, and oversize materials are conveyed to the independent applying and scattering openings through the corresponding screw rod bins. In the working process of the device, small particles preferentially improve the soil through bottom layer screening, and large particles enhance the wind and sand resistance through the surface application layer, so that the soil fertility improvement and sand stabilization effects are synchronously achieved. Through the optimal design of the swing path of the sieve plate and the precise material conveying of the screw bin, the problem that a solid-liquid mixture is difficult to layer and cover in desertification control is solved, the sorting efficiency and the spreading uniformity are improved, and the device has the characteristics of being compact in structure, reliable in driving and high in applicability, and is suitable for large-scale control of desertification and saline-alkali soil.

The invention discloses a simulation lunar dust excitation speed measurement system and method under a vacuum plume action condition, and relates to the technical field of aerospace engineering, and the system comprises a vacuum chamber and thruster system, an image collection assembly, a synchronous control collection system, a pulse laser light path, a high-speed spotlight, and a simulation lunar surface. In the invention, two optical systems of particle image velocity measurement and particle tracking velocity measurement are integrated in the same experiment, and the 532nm optical filter and the light trapping sheet are configured to realize compatibility of optical requirements, so that the problems that lunar dust particles with different scales and velocities cannot be measured synchronously and the optical systems interfere with each other in the prior art are solved; according to the method, velocity field data of micron-sized high-speed small particles and millimeter-sized low-speed large particles can be synchronously obtained and directly correspond to each other, the measurement integrity and reliability are improved in combination with simulation environment and synchronous control, and accurate data support is provided for spacecraft lunar dust prevention design.

The utility model discloses a device for sorting copper and aluminum particles after crushing of waste lithium batteries, which is provided with a vibrating screen (1), and a material inlet at the upper part of the vibrating screen (1) receives materials generated by a crusher; the sorting device is also provided with a large particle sorting machine (4) and a small particle sorting machine (6); and a large particle outlet and a small particle outlet of the vibrating screen (1) are respectively connected with the large particle sorting machine (4) and the small particle sorting machine (6) through the conveying pipeline (3). By the adoption of the technical scheme, the copper-aluminum mixture generated in the waste lithium battery crushing and sorting process can be efficiently sorted, high-purity copper particles and aluminum particles are obtained, and recycling of waste materials is achieved; the process is reasonable and feasible, equipment is simple, and recovery cost is low.

The invention relates to a PC / PET alloy material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The PC / PET alloy material disclosed by the invention is prepared from the following components in parts by weight: 38 to 57 parts of PC resin, 18 to 32 parts of PET resin, 9 to 16 parts of talcum powder, 1.5 to 8 parts of toughening agent and 0.05 to 0.35 part of ester exchange inhibitor, the pH value of the talcum powder is less than 9, and the D50 particle size is 2-3 [mu] m; the intrinsic viscosity of the PET resin is 0.7 to 0.9 dL / g; the ester exchange inhibitor comprises at least one of sodium pyrophosphate and disodium dihydrogen pyrophosphate. The PC resin and the medium-viscosity PET resin are compounded, and the talcum powder with small pH value and small particle size is selected, so that the degradation of PC can be reduced, the shear heat of a PC / PET system is reduced, and good impact performance and good appearance after heat retention are realized.

The utility model relates to the technical field of dust screening equipment, and particularly discloses a pipeline type vortex dust screening device which comprises a main shell, an annular cavity is formed in the main shell, a variable-diameter vortex assembly is arranged at one end of the main shell and comprises a conical barrel, one end of the conical barrel is communicated with the annular cavity, and the other end of the conical barrel is communicated with the annular cavity. A guide turbofan is mounted at the other end; the pipeline type vortex dust screening device flows through the inner wall of the conical barrel and forms vortex flow under the guiding action of the multiple guide blades, so that a buffering section is formed, meanwhile, vortex airflow further enters the annular cavity and forms secondary buffering, and the dust screening effect is improved. According to the cyclone separator, the cyclone separator is arranged in the annular cavity, other large-mesh particle dust falls down and is collected in the vortex process of the annular cavity, relatively light small-particle dust is directly output, so that the required particle dust is screened, the whole structure is simple, maintenance is convenient, energy consumption is relatively low, meanwhile, the conical cylinder and the annular cavity jointly form secondary separation, and the separation efficiency is improved. And large particles can be better screened out.

The utility model discloses a grinding device for producing an oil suspending agent, which comprises a rack, a grinding bin assembled on the rack and divided into an outer sleeve and a central rotating cylinder driven to rotate, and the outer sleeve is provided with a discharge port; a grinding hopper is fixedly arranged at the bottom end of the central rotary cylinder, and a plurality of filtering holes are formed in the grinding hopper; the end part of an output shaft of the driving motor is fixedly provided with a grinding hammer which extends into the grinding hopper. According to the grinding device for oil suspending agent production, through the design of the grinding hopper, raw materials move upwards along the side wall of the grinding hopper under the action of centrifugal force, raw material particles with small particle size and light weight enter the discharging channel through the filtering holes firstly, the screening effect is achieved, and the raw material particles with large particle size and light weight enter the discharging channel; and raw material particles with heavy weight stay at the bottom of the grinding hopper and are crushed and ground by the grinding hammer without being matched with a lifting device, so that the grinding device is relatively convenient.

The invention relates to the technical field of waste resourceful treatment, in particular to a sponge titanium weight bottom skin crushing and impurity removing method which comprises the following steps of peeling, bottom skin brake cutting, water jet cutting and crushing, acid leaching and impurity removing, ultrasonic cleaning, argon drying and screening and recycling. The bottom skin is crushed into small-granularity particles by adopting a cross grid water jet cutting technology, metal impurities such as Fe and Ni are removed in combination with acid leaching treatment, residual impurities are removed through multi-stage ultrasonic cleaning, oxidation discoloration is avoided through argon atmosphere drying, and meanwhile water jet sand is recycled; in the process, key indexes such as brake cutting pressure, cutting parameters, acid leaching time and ultrasonic frequency are accurately controlled through a quantification formula. The method effectively solves the problems that equipment is easy to damage during crushing and impurities are difficult to remove in a traditional process, remarkably improves the grade of bottom leather materials, widens the downstream application range, improves the resource utilization rate and economic benefits, and is suitable for industrial batch production.

The invention discloses a method for preparing anhydrite through ultrasound-assisted phosphogypsum crystal transformation, which is characterized in that phosphogypsum is used as a raw material, ammonium persulfate is used as an additive, a dilute sulfuric acid solution is used as a crystal transformation agent, and the anhydrite is prepared by adopting a sulfuric acid method under ultrasound-assisted action. The process for preparing the anhydrous gypsum has the characteristics of low sulfuric acid concentration, low equipment corrosion degree, low heating temperature, low energy consumption, high whiteness of the product anhydrous gypsum and small particle size.

The invention belongs to the technical field of biological pharmacy, and particularly relates to a preparation method and application of a nano-drug carrier. The invention provides a preparation process based on a pre-polymerization-coordination-shaping sequence, which comprises the following steps: firstly, slightly combining chitosan and polyphenol under a near-neutral condition to form small particles with uniform size and good dispersity, so that adhesion among the particles is effectively reduced; then ferric ions are slowly introduced under the regulation and control of a weak chelating agent, so that the ferric ions are uniformly coordinated on the surfaces of the particles, and an inner layer which is compact in structure and has responsiveness to an acid environment or a competitive ligand is constructed; and finally, sodium alginate is introduced, crosslinking is performed through slow-release calcium ions, a flexible outer layer is formed, and the layer and the inner layer have a synergistic effect, so that the dilution resistance and the protein adsorption resistance of the carrier are remarkably enhanced.

The invention relates to the technical field of dry quenching production dust removal, and discloses a dry quenching fly ash storage and transportation integrated system which comprises a dust removal frame, an ash discharge frame, a receiving frame, a sliding baffle, a return spring, a V-shaped rod, a filter plate, a dust removal screen plate, a rotating frame, a belt transmission piece, a lead screw and the like. An ash discharge frame is fixedly connected below the dust removal frame, a receiving frame is placed at an outlet below the ash discharge frame, a sliding baffle is slidably connected to the receiving frame, a return spring is connected between the sliding baffle and the receiving frame, and a V-shaped rod is fixedly connected to the ash discharge frame. According to the device, particle impurities in impurity-containing gas generated in the dry quenching process are screened out through double-layer filtration of the filter plate and the dust removal net plate, large-particle impurities and small-particle impurities are screened out respectively, the screening effect is improved, the rotating mechanism and the lifting knocking mechanism are driven to operate through airflow thrust when the gas is filtered, and the dust removal effect is improved. Small-particle impurities blocked in meshes in the dust removal screen plate are knocked off, and the function of automatically cleaning the dust removal screen plate is achieved while gas is filtered.

The invention relates to an oil field auxiliary agent, and particularly discloses a temperature-resistant salt-resistant nano fluid oil displacement agent and preparation and application thereof, the temperature-resistant salt-resistant nano fluid oil displacement agent comprises the following components by weight: 5-12 parts of modified nano SiO2 particles, 10-20 parts of a nonionic surfactant, 10-30 parts of a gemini benzoxazine surfactant, 1-5 parts of a dispersant, 10-20 parts of a mutual solvent, and 20-50 parts of water; wherein the modified nano SiO2 particles are obtained by modifying nano SiO2 particles through a macromolecular coupling agent. The nano-fluid oil-displacing agent has the beneficial effects that the recovery efficiency can be improved when the nano-fluid oil-displacing agent is used for exploiting a high-temperature and high-salt oil reservoir, and the nano-fluid oil-displacing agent is good in temperature resistance and salt resistance, small in particle size and capable of remarkably reducing the oil-water interfacial tension.

The invention discloses polybutadiene latex, a preparation method thereof and transparent ABS (Acrylonitrile Butadiene Styrene) resin. In the preparation process of the polybutadiene latex, the emulsifier is additionally added at a relatively high conversion rate to promote the reaction to generate part of latex particles with small particle sizes. When the latex prepared by the method is used for further preparing the transparent ABS resin, since the latex with the particle size of 30-70nm has a rayleigh scattering effect to a certain extent, a small amount of blue light can be scattered, so that the yellow index of the resin is reduced, and the prepared transparent ABS has better hue.