1113 results about "Metal impurities" patented technology

The invention discloses a method and a device for modifying and recycling waste plastics. The method comprises the following steps: carrying out multi-band electromagnetic resonance sorting on plastic fragments, distinguishing plastic types through an intelligent recognition algorithm, and synchronously adopting high-frequency eddy current sorting to remove metal impurities, so as to obtain classified plastic fragments; then supercritical fluid treatment is conducted, impurities are removed through a pressure oscillation system, obtained purified plastic fragments, a chain extender and nanofiller are jointly fed into solid-state shearing equipment, a molecular chain repairing reaction is triggered through a temperature control system, then the purified plastic fragments are injected into an intelligent forming system, and technological parameters are dynamically adjusted based on real-time monitoring data; forming a microstructure self-repairing replica through gradient cooling to obtain a regenerated plastic product, and embedding a traceable chip into the regenerated plastic product; impurity separation efficiency is improved through electromagnetic-vortex synergistic separation, microporous pollutants are deeply removed through supercritical fluid treatment, aged molecular chains are effectively repaired through a solid-state shearing chain extension technology, the microstructure of a product is optimized, and the strength and quality of the regenerated plastic product are improved.

The invention relates to the technical field of plastic recycling, in particular to a waste plastic crushing and sorting device and an automatic metal impurity rejecting method.The waste plastic crushing and sorting device comprises a rack, a primary separation assembly and a two-part assembly, and the primary separation assembly comprises a crushing mechanism arranged on the rack, a flattening mechanism arranged on the crushing mechanism and a conveying and sorting mechanism arranged on a sorting mounting box; the two-part assembly comprises a crushing mechanism arranged on the sorting mounting box and a vibration screening mechanism arranged on the rack and located below the crushing mechanism, through the arrangement of the crushing mechanism and the conveying sorting mechanism, metal is adsorbed to a conveying belt after waste plastic is crushed, and through the arrangement of a power supply component, when a conductive rod slides to an insulating rod, the metal is separated from the insulating rod; the metal automatically falls into the crushing mechanism, plastic remaining on the metal is further crushed, the plastic and the metal are separated more thoroughly, plastic crushing and metal separation are conducted synchronously, the plastic crushing and separating efficiency is improved, and the labor intensity of workers is reduced.

The invention discloses a peanut oil impurity detection method based on image recognition analysis, and relates to the technical field of computer vision, and the peanut oil impurity detection method comprises the following steps: carrying out impurity targeted marking on an oil sample; adopting dual-wavelength laser to excite the oil sample subjected to impurity target marking, synchronously acquiring a fluorescence image, and marking the coordinates of a suspicious composite impurity region by utilizing an FRET fluorescence intensity ratio; metal impurities and fiber impurities are distinguished according to the plasma formant position, and nanoscale impurity morphology data are formed; detecting unmarked transparent nanoparticles, triggering surface acoustic wave assisted detection, and outputting impurity motion feature codes; inputting the FRET fluorescence intensity ratio, the nanoscale impurity morphology data and the impurity motion trail features into a graph neural network classifier based on an attention mechanism, and performing joint interpretation on impurity types; and sorting and filling the oil sample according to an impurity classification result. The comprehensive performance of impurity detection is remarkably improved through a multi-mode sensing cooperation mechanism.

The invention relates to the technical field of hafnium tetrachloride preparation, in particular to a process method for preparing low-niobium-content hafnium tetrachloride based on a hydrogen reduction method, which comprises the following steps: S1, raw material processing, S2, chlorination and impurity removal, S3, purification, S4, refining and S5, material receiving. According to the method, metal impurities in the hafnium-containing raw stone are removed step by step through the working procedures of raw material processing, chlorination and impurity removal, purification, refining and material receiving, high-purity hafnium tetrachloride with the low niobium content is obtained, in the refining working procedure, under the assistance of the supported catalyst, the metal niobium impurities are removed through a hydrogen reduction method, the removal rate is effectively increased, and the production cost is reduced. And moreover, the process flow is simplified, the energy consumption is reduced, and the method meets the environmental protection requirement.

The invention relates to the technical field of injection molding waste plastic recovery, in particular to injection molding equipment and a process for producing plastic automobile ornaments. The equipment comprises an injection machine and an online recycling mechanism, the injection machine is provided with a double-channel solution cavity composed of a new material main runner and a waste material returning cavity, and the tail ends of the two channels converge in a 30-degree Y shape; the on-line recovery mechanism comprises a waste conveyor belt, a crushing mechanism and a transmission device, a magnetic separation impurity removal device is arranged in the crushing mechanism, and a discharge end is connected with the batching mechanism. Through double channels and a Y-shaped confluence structure, production waste is subjected to online recovery and crushing and then is fused, mixed and reused with new materials, the waste utilization rate is increased, and the cost is reduced. The magnetic separation and impurity removal device efficiently removes metal impurities through the movement of inclined avoiding, rotary impurity scraping and inclined discharging of a scraping plate; the batching mechanism removes dust to prevent impurities from affecting melt performance. The crushing device adapts to different waste materials, airflow assists discharging to improve the efficiency, and the green production concept is met.

The invention discloses a waste rubber sealing element recovery treatment all-in-one machine, and relates to the technical field of waste recovery, the waste rubber sealing element recovery treatment all-in-one machine comprises a treatment box, the outer wall of the front side of the treatment box is fixedly connected with a feeding hopper, the inner wall of the treatment box is fixedly connected with a sieve plate, and the outer wall of the front side of the treatment box is provided with a discharge port corresponding to the sieve plate. When the rubber sealing element is processed, the first driving motor drives the roller to rotate, rubber particles are screened through the screen holes, the particles meeting the size are thrown out, the particles which do not meet the standard are taken back through the blocking plate to be smashed again, the particle size uniformity is ensured, meanwhile, the knocking block is matched with the triggering rod, the sealing element accurately falls onto the smashing roller, deviation is avoided, and the screen holes are prevented from being blocked. And in addition, an inner gear ring and a third gear synchronously drive a rotating rod to rotate, a power-on guide column is matched with a magnetic attraction ring, the magnetic attraction ring moves in a reciprocating mode to attract metal impurities, the impurities fly into a magnetic collecting barrel after power failure, and the impurity removal efficiency and the rubber recovery purity and quality are improved.

The invention discloses a method for preparing activated carbon by using waste tire pyrolytic carbon black, which comprises the following steps of: selectively and dynamically screening and removing magnetic impurities, namely dynamically screening a pyrolytic product through an airflow grading device, separating out high-purity carbon black particles with the particle size of less than 10 microns, and removing metal impurities and residual steel wires by using a magnetic separation technology to obtain the activated carbon. And the purity of the carbon black reaches 95% or above. Therefore, the pore structure is optimized through combination of a wet method and high-temperature activation, the pore distribution is further maintained, regulated and controlled through freeze drying and solvent heat treatment, the specific surface area of the finally prepared activated carbon reaches 1500-2000 m < 2 > / g, and the pore volume retention rate reaches 90% or above; the technology not only effectively solves the problems of insufficient carbon black purity, unstable pore structure and high energy consumption in the prior art, but also remarkably improves the adsorption performance and chemical stability, so that the carbon black is widely applied to the fields of water treatment, gas adsorption, catalyst carriers and the like, and has the outstanding advantages of high efficiency, low consumption and environmental protection.

The invention discloses a processing method for reducing the broken rice rate of commercial rice, which comprises the following steps: S1, an unhulled rice pretreatment stage: S1a, a multi-stage linkage impurity removal process is adopted, and large impurities, light impurities, metal impurities and stones in unhulled rice are removed through combination of classified screening, airflow separation, magnetic separation and specific gravity stone removal, so that the impurity removal rate is greater than or equal to 99%; s1b, on the basis of a dynamic adaptation model of rice physical characteristics and rice hulling parameters, rice moisture and hardness data are collected in real time through a first detection device, the rice hulling flow and the inter-roller pressure are calculated and adjusted through a control unit, and closed-loop control is achieved; s2, carrying out a color sorting and polishing stage; s3, carrying out a rice milling regulation and control stage; and S4, entering a vacuum packaging stage.

The invention discloses a method for synthesizing electronic-grade ethyl acetate through catalytic esterification of acidic ion exchange resin, and belongs to the technical field of ethyl acetate preparation. The method comprises the following steps: mixing crosslinked polystyrene white balls and a swelling agent, and dropwise adding concentrated sulfuric acid for reaction to obtain S-PS resin; mixing an EDTA disodium salt saturated solution and a polyacrylic acid solution, adding a cross-linking agent and an emulsifier, and carrying out a cross-linking curing reaction to obtain EDTA microcapsules; the preparation method comprises the following steps: dispersing S-PS resin in a solvent, adding EDTA microcapsules, a dehydration condensation agent and a catalyst, reacting under the protection of inert gas, and filtering and recovering after the reaction is finished to obtain S-PS-EDTA resin; mixing glacial acetic acid, absolute ethyl alcohol and S-PS (at) EDTA resin for reaction, and filtering and collecting liquid after the reaction is finished; and rectifying the collected liquid to obtain the product. According to the method provided by the invention, metal impurities can be chelated in the synthesis process, and the electronic-grade ethyl acetate with high purity and low impurity content is produced.

The bearing retainer magnetic polishing device comprises a magnetic polishing machine and a material overturning frame located at the front end of the magnetic polishing machine, a collecting groove is formed in the right side of the material overturning frame, and a cellular bearing frame is connected to the material overturning frame through a material overturning mechanism; the material turning mechanism comprises a driving air cylinder, a sliding table, a material turning rod, an arc-shaped top shell, a material turning guide groove and a circular sliding block, an equal dividing mechanism is arranged in the cellular bearing frame and comprises a set of transverse fixing plates and a plurality of vertical adjusting plates, and a collecting box is placed in the collecting groove. The bearing retainer magnetic polishing device has the beneficial effects that the bearing retainers needing magnetic polishing are placed in the lattices, the bearing retainers can be prevented from being collided and damaged in the magnetic polishing process, the latticed bearing frames can be adjusted according to the sizes of the bearing retainers, the overturning mechanism can drive the latticed bearing frames to automatically overturn and discharge, and the bearing retainers are prevented from being damaged. And in cooperation with a collecting box in the collecting groove, metal impurities attached to the surface of the bearing retainer can be washed conveniently, and the magnetic needles can be collected conveniently.

The invention discloses a scrap aluminum classification and rapid identification method, and relates to the field of scrap aluminum classification and rapid identification, the method comprises the following steps: S1, grading pretreatment: to-be-sorted scrap aluminum is conveyed into a three-layer vibrating screen machine through a conveying belt for grading screening, and different sizes of scrap aluminum are sorted out; and S2, impurity separation is conducted, specifically, the classified scrap aluminum is conveyed into a drum-type magnetic separator, magnetic impurities are removed, then the scrap aluminum subjected to magnetic separation is conveyed to an airflow separator, light non-metal impurities are separated, then the scrap aluminum is conveyed to an objective table through a conveying belt, full-process automatic treatment is conducted, manual dependence is reduced, the production efficiency is improved, and the production cost is reduced. A single production line can reduce the workload of sorting workers; and compared with manual sorting, due to the fact that classification is accurate, the rejection rate of the regenerated aluminum alloy can be effectively reduced, and economic benefits are remarkably improved.

The invention relates to a hollow silicon dioxide microsphere and a preparation method and application thereof, the hollow silicon dioxide microsphere has a dielectric constant less than or equal to 2.5, a dielectric loss tangent angle less than or equal to 0.001, a purity greater than 95%, a sphericity rate greater than or equal to 99%, a wall thickness greater than 0 and less than or equal to 0.42 [mu] m, and an average diameter of 0.1 [mu] m-5 [mu] m, and the hollow rate, the wall thickness and the average particle size satisfy a relational expression, eta is the hollow rate, t is the wall thickness, and R is 1 / 2 of the average particle size. The hollow silicon dioxide microspheres provided by the invention are high in spherical rate, firm in wall thickness, uniform in particle size distribution, high in purity, relatively excellent in dielectric property and extremely low in content of metal impurities, and can meet the application requirements of high-speed and high-frequency substrates, in addition, the preparation method provided by the invention is few in adopted raw materials, simple in preparation process, low in cost and high in efficiency.

The invention discloses an integrated reaction process for preparing potassium fluoborate through efficient conversion of fluosilicic acid, and relates to the technical field of inorganic fluorine chemical industry, and the potassium fluoborate is prepared through the technologies of complexing metal impurities through EDTA disodium, catalyzing condensation reaction through Fe-TiO2, carrying out K2CO3 / nano gamma-Al2O3 composite desilicication, deeply removing sodium through ion exchange and carrying out mother liquor closed-loop circulation. The problems of serious sodium pollution, low reaction efficiency and resource waste in the traditional process are solved. The composite desiliconization agent improves the desiliconization rate to 96%, the reaction time is shortened by 40% through nanometer catalysis, the mother liquor recycling rate is 80%, and the silicon slag is converted into high-added-value nanometer white carbon black. The product purity is greater than or equal to 99.5%, the sodium residue is less than or equal to 0.003%, and the method is suitable for industrial production of electronic-grade potassium fluoborate.

The invention relates to the technical field of sodium battery material preparation, in particular to a preparation method of a sodium battery hard carbon material. The method comprises the following steps: raw material treatment: moso bamboo or shell biomass is subjected to bubble crushing treatment to obtain raw material particles, the crushing air pressure is 0.5-3 MPa, and the raw material particles are crushed until the particle size is 50-200 [mu] m; pre-carbonization: carrying out stepped heating on the raw material particles under a protective atmosphere; carrying out heat preservation for 0.5-1 hour at an initial temperature of 200-250 DEG C, then heating to 400-600 DEG C at a speed of 5-10 DEG C / min, and carrying out heat preservation for 1-3 hours to obtain a pre-carbonized product; according to the method, the protective atmosphere is introduced at intervals by adopting a dynamic regulation and control strategy in the pre-carbonization step, so that the consumption of the protective gas is effectively reduced, meanwhile, the volatile matter content of the hearth is monitored in real time by adopting a non-contact conductivity sensor, and once the volatile matter content exceeds a preset threshold value, a shutdown signal is immediately sent to a gas tank; therefore, the residual quantity of metal impurities is effectively reduced.

The invention discloses a crystal growth device and a crystal growth method for gallium oxide crystal downward growth, and belongs to the technical field of gallium oxide single crystal preparation. The device comprises a crucible, an upper shaft, a heating mechanism and a heat preservation mechanism, the crucible is composed of a metal layer and an isolation layer arranged on the inner side wall of the metal layer, an opening is formed in the top of the metal layer, the thermal expansion coefficient of the side, away from the metal layer, of the isolation layer ranges from 0.5 * 10 <-6 > k <-1 > to 2.5 * 10 <-6 > k <-1 >, and the thermal expansion coefficient of the isolation layer is gradually increased outwards from the side, away from the metal layer, of the isolation layer. The rising rate is 2 * 10 <-6 >-3 * 10 <-6 > k <-1 > / mm; the upper shaft is arranged above an opening of the crucible and can lift and rotate relative to the crucible, a seed crystal support is arranged below the upper shaft, a first cooling pipeline is arranged in the upper shaft, and a second cooling pipeline is arranged in the seed crystal support. The crystal growth device breaks through the limitation of a traditional Czochralski method, a casting method and a Bridgman method, realizes downward growth of crystals, and can reduce the influence of crucible metal impurities on the crystals, so that gallium oxide single crystals with high quality, large size and high yield are obtained.

To provide: a cleaning fluid having improved removability of stains due to impurities: and a cleaning method using the cleaning fluid.SOLUTION: Provided is a cleaning fluid, comprising a solvent and a metal remover. The cleaning fluid includes two or more kinds of solvents, the distance (HSP distance) between the Hansen solubility parameter of the cleaning fluid and the Hansen solubility parameter of dimethylacetamide is 1.0 or less, and the content of metal impurities is 0.1×10-9 pts.mass or more to 102×10-6 pts.mass or less relative to 100 pts.mass in total of the solvent and the metal remover.SELECTED DRAWING: None

The invention relates to an automatic package removing device, and belongs to the technical field of package detection equipment. The device comprises a horizontal conveyor belt, a metal detection unit, a weight detection unit, a correlation grating, a servo push plate mechanism and a control system, the metal detection unit detects metal impurities through a metal detector above a conveying belt, the weight detection unit obtains weight data through a weighing platform below the conveying belt, a built-in encoder of a correlation grating collects the speed of the conveying belt in real time, and the servo push plate mechanism drives a push plate through a servo motor and monitors thrust through a pressure sensor. And the control system receives the detection signal, calculates the starting delay time of the push plate based on the speed of the conveyor belt and the conveying distance, and drives the servo motor to act according to preset parameters, so that accurate removal of metal, weight and composite defective packaging materials is realized. The device is mainly used for automatically detecting and removing unqualified packages on a packaging production line, and the packaging quality control efficiency is improved.

The invention relates to the technical field of polyester fiberboard production, and provides polyester fiberboard production integrated equipment with an automatic waste recycling function, the polyester fiberboard production integrated equipment comprises a recycling box, a material guide groove and a solid-liquid separation box, a material crushing and slicing assembly and a high-pressure water washing assembly are arranged in the recycling box, and the high-pressure water washing assembly is located below the material crushing and slicing assembly; waste materials are sliced and cleaned through cooperation of the material crushing and slicing assembly and the high-pressure water washing assembly, the material guide groove is obliquely formed in the bottom of the recycling box, the material crushing and knocking assembly is arranged above the material guide groove, the electromagnet set is installed below the material guide groove, and secondary cleaning and metal impurity removal are conducted on the waste materials through cooperation of the material crushing and knocking assembly and the electromagnet set. And one end, far away from the recycling box, of the material guide groove extends into the solid-liquid separation box, and through the technical scheme, the problem that the cleaning efficiency is low when an existing polyester fiber board production device recycles and treats waste materials with more impurities and a large amount is solved.

The invention relates to the technical field of pressure reducing valves, and discloses a high-pressure hydrogen pressure reducing valve and a using method thereof.The high-pressure hydrogen pressure reducing valve comprises a valve pipe assembly, the valve pipe assembly comprises a hydrogen filtering assembly, the two ends of the hydrogen filtering assembly fixedly communicate with valve shells, and the top of the hydrogen filtering assembly fixedly communicates with a gas valve assembly; one end of the hydrogen filtering assembly is fixedly sleeved with an electric heating ring sleeve, the other end of the hydrogen filtering assembly is rotationally connected with a fan wheel, the side face of the fan wheel is rotationally sleeved with a magnetic cutting element, the bottom of the fan wheel is fixedly connected with a rotating wheel, and one end of the inner side of the bottom of the valve shell fixedly communicates with a magnetic cylinder. The problem that groove-shaped erosion marks appear on the sealing face of the valve seat due to the fact that metal impurity particles in a pipeline of the pressure reducing valve impact the valve element and the valve seat along with high-speed hydrogen flow is solved, the metal impurity particles attached to the magnetic cylinder can be recycled, and the problems that resources are wasted and the surface of an outlet of a valve body is frosted when high-pressure hydrogen expands through throttling are solved.

The utility model provides a hydraulic valve core with a built-in impurity removal mechanism, which belongs to the technical field of hydraulic valves and comprises a valve sleeve and a valve core arranged on the valve sleeve, a sealing ring is sleeved at the rear end of the valve sleeve and mounted in a hydraulic valve body, and the valve core is mounted in the valve sleeve. Hydraulic oil is prevented from directly entering a gap between the valve sleeve and the valve element through the guide groove formed in the front end of the valve element, the hydraulic oil is filtered through the filtering sleeve arranged on one side of the collecting groove, and meanwhile metal impurities in the hydraulic oil are further adsorbed and cleaned through the magnet rings installed on the inner walls of the two sides of the collecting groove. Therefore, blockage of filter holes in the filter sleeve caused by accumulation of excessive metal impurities is avoided, the impurity removal effect is improved while the filter effect of the filter sleeve is kept, hydraulic oil entering the gap between the valve sleeve and the valve element is kept pure, the valve element can flexibly move on the inner wall of the valve sleeve, and the service life of the valve element is prolonged. The problem that the valve element is inconvenient to move and stuck due to the fact that impurities enter gaps is solved.

The invention relates to a method for preparing industrial silicon powder for organic silicon monomer synthesis from high-calcium industrial silicon melt, and belongs to the technical field of industrial silicon production. Based on the practical problems that the content of CaSi2 in an industrial silicon product is high due to the fact that the content of Ca impurities in the melt is too high after the silicon melt is subjected to external refining, and the selectivity of dimethyldichlorosilane is low when the industrial silicon is used as a raw material to synthesize an organic silicon monomer, the method comprises the following steps: obtaining the content of main metal impurities in the high-calcium silicon melt after the silicon melt is subjected to external refining; the preparation method comprises the following steps: quantitatively adding an alloying agent Al to adjust the components of a silicon melt, carrying out heat preservation and refining, pouring, and controlling the solidification rate of the silicon melt, so that a large amount of beneficial Si8Al6Fe4Ca and Si2Al2Ca phases are formed, and meanwhile, the precipitation of a harmful inclusion phase CaSi2 is avoided, and the industrial silicon powder for synthesizing the organic silicon monomer is prepared, so that the selectivity and activity of the synthesis process of the organic silicon monomer are improved.

The invention relates to the technical field of preparation of high-purity boron oxide, and discloses a purification method of high-purity boron oxide and a device thereof, and the purification method comprises the following steps: step 1, mixing crude boron oxide with a liquid metal alloy, and dissolving metal impurities through gradient temperature control; 2, applying ultrasonic treatment to the mixed system, introducing a vortex field, and stripping impurities on the surface of the boron oxide; 3, a liquid metal phase and a boron oxide solid phase are separated through cooperation of a magnetic field and a pulse high-voltage electrostatic field; 4, non-metal ion impurities are removed through a gradient porous ceramic adsorption bed; and step 5, melting boron oxide in vacuum and carrying out gradient cooling crystallization. By adopting the technical scheme of a Ga-I n-Bi-Er quaternary liquid alloy system, the technical effect of selective targeted removal of metal impurities is achieved, and compared with a liquid metal system depending on single phase solubility difference in the prior art, the defect that efficient chelating and dynamic settling separation of the impurities cannot be achieved at the same time is overcome.

The invention discloses a silicon powder activity on-line dynamic monitoring method, which comprises the following steps: S1, on-line monitoring: monitoring characteristic parameters by using a plurality of spectrum detectors in the operation process of a fluidized bed; s2, parameter conversion: calculating intermediate parameters according to a parameter conversion formula by utilizing the characteristic parameters monitored in the step S1 in the online monitoring; and S3, activity calculation: calculating the real-time activity index of the silicon powder in the fluidized bed according to an activity calculation formula by using the intermediate parameters calculated in the step S2. The method has the advantages that the activity condition of the silicon powder in the fluidized bed can be accurately reflected in real time, and a scientific basis is provided for evaluating the activity of the silicon powder by accurately calculating key parameters such as a hydroxyl inhibition factor, an amorphous phase activity gain and a metal impurity inhibition factor; a regulation and control basis is provided for real-time regulation and control of the feeding proportion and the like of the fluidized bed, the production process is optimized, the product quality is improved, the production cost is reduced, and remarkable economic benefits are brought to enterprises.

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 provides a treatment method for recovering high-purity graphite from black powder leaching residues. The treatment method comprises the following steps: removing impurity elements in graphite from the black powder leaching residues in a Joule heat flash evaporation manner; the black powder leaching residues obtained after impurity removal are put into a ball mill, liquid phenolic resin is added, full mixing is conducted, and ball milling is conducted; and putting the ball-milled mixture into flash evaporation Joule thermal equipment, and carbonizing and graphitizing the phenolic resin to obtain regenerated graphite. According to the method, the temperature of the black powder leaching residues can be increased within an extremely short time, metal impurities in the black powder leaching residues are gasified, and impurities in graphite are removed. Phenolic resin is used for carbonization and graphitization, generated disordered carbon can fill up particle cracks in waste graphite and internal lattice defects, a conductive network among graphite particles is established, a compact carbon layer is formed on the surface of graphite, and graphite structure transformation can also be induced in the step. The regenerated graphite obtained by the method is similar to commercial graphite in capacity and good in cycling stability.

Method for the preparation of sorbent material for use as adsorbent for carbon dioxide separation from a gas mixture, the sorbent material having primary amine or secondary amine moieties, or a combination thereof, immobilised on a solid support, wherein the sorbent material has primary amine or secondary amine moieties, or a combination thereof, is treated so as to have, after treatment, a total metal impurity content below 1400 ppm.

The present invention discloses a method for alcoholysis of EVA, which relates to the technical field of EVA. The technical solution is as follows: S1 Soak the alkaline anion exchange resin in deionized water for swelling; S2 Wash the alkaline anion exchange resin in deionized water; S3 Pack the washed alkaline anion exchange resin in a chromatography column and wash it with a hydrochloric acid solution; S4 Wash the eluted alkaline anion exchange resin with deionized water until neutral, and then wash it with a sodium hydroxide solution to obtain the activated alkaline anion exchange resin; S5 Pass the EVA solution through the activated alkaline anion exchange resin chromatography column to obtain crude EVOH; S6 The crude EVOH after alcoholysis is washed with water and dried under vacuum, then enters the extrusion equipment, and is granulated and washed to obtain EVOH resin. The present invention solves the problems of introducing metal impurities by the NaOH catalyst, complex post-treatment process and environmental pollution, and reduces the preparation difficulty and cost of EVOH.

The invention discloses a carbon / carbon composite material prefabricated part weaving process of a shaftless spiral propeller, and belongs to the technical field of carbon / carbon composite materials, and the carbon / carbon composite material prefabricated part weaving process comprises the following specific steps: manufacturing a metal shaftless spiral feeding propeller; carbon fiber prepreg is attached according to the shaftless spiral shape of the propeller to manufacture a carbon fiber prepreg material spiral, and a prefabricated part is obtained; the prefabricated part is cured, then demolding is conducted, the edge is polished, and a billet mold is obtained; fixing the blank model on a clamp of a braiding machine, braiding the blank model, and spraying resin on each layer of braided blank model; and curing the woven billet model, polishing, and finally carrying out chemical vapor deposition, carbonization, high-temperature treatment and dipping treatment to obtain the shaftless spiral carbon / carbon composite material. The obtained shaftless spiral carbon / carbon composite material is integrally formed, the strength of the product is improved, the shaftless spiral carbon / carbon composite material can replace a metal spiral propeller to prepare a negative electrode carbon material, the content of metal impurities is reduced, and the negative electrode manufacturing cost is saved.

The invention relates to the technical field of pipe fitting shot blasting machining, in particular to a reinforced shot blasting machine for the surface of a metal pipe fitting, which comprises an operation box, a box door is arranged outside the operation box, two symmetrically arranged side plates are fixedly mounted in the middle of an inner cavity of the operation box, and sorting boxes which are distributed left and right are jointly mounted between the side plates on the two sides; according to the shot blasting device, when the pipe fitting rotates, the outer portion of the pipe fitting sequentially faces the shot blasting head, and therefore the shot blasting head can evenly act on the outer wall of the pipe fitting when the shot blasting head starts shot blasting, compared with an existing device, when shot blasting is conducted on the outer portion of the pipe fitting, the outer wall of the pipe fitting can be evenly subjected to shot blasting operation through rotation of the pipe fitting, and the shot blasting efficiency is improved. Steel shots thrown by the shot blasting head and metal impurities shot down on the outer wall of a steel pipe can be subjected to magnetic separation treatment through arrangement of the sorting unit, and the used steel shots can be washed through arrangement of the cleaning unit, so that iron oxide impurities and the like which cannot be adsorbed during magnetic separation are removed, and the used steel shots can be recycled after being cleaned.

The invention discloses a gallium nitride electronic device and a preparation method thereof, and belongs to the technical field of semiconductors, the gallium nitride electronic device comprises a gallium nitride substrate and a semiconductor structure layer arranged on the gallium nitride substrate; the gallium nitride substrate is provided with shallow-energy-level donor impurities and deep-energy-level acceptor impurities, the deep-energy-level acceptor impurities are used for compensating the shallow-energy-level donor impurities, and the deep-energy-level acceptor impurities are metal impurities; a compensation layer is arranged at the interface of the gallium nitride substrate and the semiconductor structure layer, and the concentration of deep-energy-level acceptor impurities in the compensation layer is larger than that of the deep-energy-level acceptor impurities in the gallium nitride substrate. Metal impurities are doped in the gallium nitride substrate to serve as deep-energy-level acceptor impurities to compensate shallow-energy-level donor impurities, the concentration of impurity atoms adsorbed on the surface of the gallium nitride substrate can be reduced, and the performance of a gallium nitride electron tube device is improved.