226 results about "Metallic impurities" patented technology

This invention belongs to the field of wastewater treatment technology, specifically relating to a method for removing metallic impurities from acidic copper-containing etching wastewater at room temperature and pressure. The method includes the following steps: S1, adding an oxidant to the acidic copper-containing etching wastewater to conduct an oxidation-reduction reaction, obtaining a pretreatment solution; S2, adding phosphoric acid or soluble phosphate to the pretreatment solution, adjusting the pH to 1.3-1.7 using a pH adjuster, stirring, and filtering to obtain a purified copper-containing solution. The method provided by this invention achieves high removal rates for Fe, Ni, Zn, Ca, and Mg, while maintaining a high copper ion content. It can recycle and regenerate high-purity copper salt products for application in food, cosmetics, medical, electroplating, and other fields, while also reducing hazardous waste generation, improving economic efficiency, and significantly reducing costs.

The invention relates to the field of industrial silicon melt purification, and discloses an industrial silicon melt purification method based on directional solidification and composite adsorption, which comprises the following steps: S1, multi-stage directional solidification pre-enrichment: carrying out primary directional solidification treatment on an industrial silicon melt, and controlling the solidification rate to be 0.5-5mm / min and the temperature gradient parameter, most of metal impurities in the melt are pre-enriched in a specific area; s2, dynamic targeted adsorption: in or after the primary directional solidification process, an efficient composite adsorbent is dynamically and continuously added into an impurity-rich area of the melt or the whole melt in batches, and the composite adsorbent has selective adsorption capacity for different impurities; and S3, intelligent regulation and control: constructing a full-flow adaptive intelligent dynamic regulation and control system based on digital twinning and AI algorithms. Compared with the prior art, the method has the advantages that the impurities are efficiently and stably removed, the grain structure is accurately modified, and meanwhile, the green and low-carbon production target is achieved.

The invention discloses a low-cost high-first-effect micron silicon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: treating the surface of micron silicon by adopting an oxidant solution to form a silicon dioxide passivation layer, and then carrying out surface modification by using a silane coupling agent; the method comprises the following steps: performing acid-base alternate soaking treatment on a biomass carbon source to reduce the content of metal impurities; mixing the delimed biomass carbon source, the composite carbon source and the pretreated micron silicon, firstly adding a weak acid catalyst for hydrothermal reaction to form a hard carbon inner layer, then adding a weak base catalyst for regulating the pH value of the system to alkalescence in batches, and continuing hydrothermal reaction to form a soft carbon outer layer; and washing and drying the product, and carrying out carbonization treatment in an inert atmosphere to obtain the composite coated micron silicon material. The first efficiency of the material is greater than or equal to 92%, the 1C 1000-time circulation capacity retention ratio is greater than or equal to 82%, the raw material cost is low, the process is simple, and the material is suitable for lithium ion batteries in the fields of power, energy storage and consumer electronics.

The invention relates to a silver recovery technology, in particular to a method for preparing high-purity silver powder by recovering silver from retired photovoltaic module cells, which comprises the procedures of pretreatment, leaching treatment, suction filtration treatment, silver precipitation treatment, silver chloride precipitation and purification treatment, silver ammonia solution reduction and the like. The method comprises the following steps: by taking a disassembled retired photovoltaic module battery piece as a raw material, firstly, removing dust on the surface of the battery piece and metal impurities partially attached to the surface of the battery piece through pretreatment, leaching the cleaned battery piece by using a nitric acid solution, carrying out suction filtration by using a suction filtration machine, and separating to obtain silicon slag and a silver nitrate solution; the method comprises the following steps: adding a chlorinating agent into a silver nitrate solution, reacting to generate silver chloride precipitate, dissolving the separated silver chloride precipitate by using ammonia water to form a silver-ammonia solution, and finally adding a reducing agent into the silver-ammonia solution to obtain high-purity silver powder and ammonia water; compared with the conventional technology, the method for recovering silver has the advantages of low cost, no wastewater generation and simpler process, and meets the requirements of economy, high efficiency and environmental protection.

This invention relates to the field of vacuum melting technology, and in particular to a vacuum melting furnace for copper alloys and its ultrasonic-assisted melting method, comprising the following steps: placing copper alloy raw materials into a crucible and drawing a vacuum, then filling with argon gas to a slightly positive pressure; performing induction heating to a temperature 50-120°C above the melting point to obtain a melt; lowering an ultrasonic probe into the melt for continuous ultrasonic treatment; reducing the induction heating temperature to 20-60°C above the melting point and continuing ultrasonic treatment; induction heating to the melt temperature being the pouring temperature, performing pulsed ultrasonic treatment, and pouring the melt into an ingot mold; allowing the melt in the ingot mold to continue cooling with the furnace, then removing the vacuum and opening the furnace to obtain a copper alloy ingot. This invention, using the above steps, reduces gas content, increases ingot density, effectively removes non-metallic impurities, improves copper alloy purity, refines grains, and reduces secondary oxidation and gas entrapment during pouring.

This invention relates to the field of packaging carton raw material recycling and processing technology, and discloses a packaging carton raw material recycling and processing equipment, including a screening frame, a screening cylinder fixed above the screening frame, a hollow screening roller rotatably connected to the screening cylinder, a plurality of screening grooves and flow grooves respectively opened on the hollow screening roller, and a plurality of first screening holes opened on the hollow screening roller, and a rotatable electromagnet adsorption roller provided in the screening groove, a movable scraper frame provided in the screening groove, and a plurality of strip scrapers slidably connected to the hollow screening roller; the electromagnet adsorption roller rotates automatically in the screening groove to reduce the dead angle of metal impurity adsorption, while the scraper frame drives the turning rod to move back and forth synchronously to turn over the carton fragments, and can also scrape off impurities around the first screening holes, improving the efficiency of automatic separation of small non-metallic impurity particles from carton fragments.

This utility model relates to a magnetic impurity removal and feeding device for a grain mill, which effectively solves the problems of difficult cleaning of magnetic impurity removal devices and easy re-mixing of metal impurities. The technical solution includes a feeding pipe, inside which is installed a magnetic impurity removal component. The magnetic impurity removal component includes an inner cylinder and an outer cylinder, with the outer cylinder coaxially sleeved outside the inner cylinder. Several sets of magnetic units are axially evenly distributed on the outer wall of the inner cylinder. Each set of magnetic units includes several bar magnets evenly distributed around the circumference, and the number of bar magnets in each set of magnetic units increases from top to bottom. This utility model, through the setting of magnetic force difference and the flushing of grain particles, causes metal particles to gradually collect at the lower end face of the outer cylinder, which not only prevents metal impurities from being flushed back into the grain, but also makes it easier to clean them when they are collected in one place.

The application relates to the technical field of lithium iron phosphate battery recycling, in particular to a method for recycling waste lithium iron phosphate battery materials. Specifically, after the waste lithium iron phosphate battery is discharged, the battery is disassembled and separated under an inert atmosphere, and the battery is separately collected; the battery is mechanically pulverized after high-temperature calcination, and lithium iron phosphate coarse powder, copper powder and aluminum powder are obtained through vibration screening; the lithium iron phosphate coarse powder is added into an acid solution for leaching, the acid leaching solution is adsorbed and impurity-removed through metal impurity adsorption resin, and then lithium carbonate, ammonium dihydrogen phosphate and ferrous oxalate are added; after uniform stirring, drying, ball milling and roasting, lithium iron phosphate powder is obtained. The metal impurity adsorption resin has good complexing and stabilizing effects on various metal ions, so that the high purity of the lithium iron phosphate is ensured, and comprehensive resource utilization of the waste lithium iron phosphate battery is realized.

This invention provides a method for preparing high-purity silicon carbide parts based on low-pressure injection molding, belonging to the field of silicon carbide material preparation technology. The invention involves mixing wax, dispersant, reinforcing agent, and silicon carbide powder with a purity ≥99.995wt% in a mixer. The resulting slurry is placed in a low-pressure injection molding machine and injected into a mold under heating and pressurization conditions for molding. After demolding, the resulting preform undergoes dewaxing and debinding treatment. The dewaxed preform is then placed in a purified graphite kiln and sintered in a high-temperature resistance furnace to obtain the high-purity silicon carbide parts. This invention eliminates all possible introduction of metallic impurities during the material preparation, molding, dewaxing, and sintering processes, enabling the preparation of high-purity silicon carbide parts with a purity ≥99.99wt%.

This utility model relates to the field of coolant filtration and discloses a concentrated coolant-composite filtration device with a quickly replaceable filter screen. The device includes a filter, a cooling water pipe fixedly connected to the top left side of the filter, a cooling plate installed outside the cooling water pipe, a cooling fan fixedly installed at the front end of the cooling plate, a filter screen cylinder placed inside the filter, a threaded sleeve fixedly connected to the center of the bottom of the filter screen cylinder, and a threaded opening at the top of the filter. This concentrated coolant-composite filtration device with a quickly replaceable filter screen filters particulate impurities contained in the coolant through the filter screen cylinder. Simultaneously, a magnetic rod inside the filter screen cylinder can adsorb metallic impurities mixed in the coolant, enhancing the filtration effect as the coolant passes through the filter screen cylinder. Cleaning is simple; just pull the ring to remove the magnetic rod from the limiting bracket for cleaning, thus solving the problem of poor filtration effect.

The application discloses a kind of synthesis methods of high-purity electronic grade sodium hypophosphite, dilute phosphine gas is passed into to the mixed solution of sodium hypochlorite and sodium hydroxide that has been pre-cooled with sufficient stirring, and sodium hydroxide is added to carry out reaction;After reaction is completed, filtration, concentration, crystallization, separation are carried out, and the obtained product is purified by resin to obtain high-purity electronic grade sodium hypophosphite product.Compared with the traditional "yellow phosphorus-lime-soda" oxidation-reduction method for preparing industrial grade product and then preparing high-purity electronic grade sodium hypophosphite, the product purification difficulty of the application is low, by using 7N grade ultra-high purity phosphine without any metal impurities, the problem that arsenic, silicon, germanium, nickel, chromium and other metal impurities cannot be completely removed by traditional process can be effectively solved.In addition, the application also has the advantages of effectively solving the problem of three wastes, high recycling rate of by-products, high economy and the like.

The invention discloses an energy-saving smelting process for secondary aluminum production. The energy-saving smelting process comprises the following steps: pretreating raw materials; a medium-frequency induction furnace is used as a main smelting furnace; carrying out gradient heating smelting; and the low-consumption refining process comprises the steps that at the temperature of 660-670 DEG C, a composite refining agent is adopted, mechanical vibration is applied for refining and heat preservation casting, a three-stage waste heat utilization system of tail gas waste heat drying, combustion-supporting air preheating and ingot casting waste heat recycling is constructed, and the tail gas waste heat utilization rate is increased to 60% or above; the intermediate frequency furnace double-layer heat preservation design is matched with a closed-loop cooling system, the heat loss is reduced by 40%, the oxidation burning loss of molten aluminum is reduced through a gradient temperature rising strategy, energy is saved by 25%-30% compared with a traditional technology, the production cost is reduced by 15%-20%, raw material pretreatment is conducted through crushing, magnetic separation and classified batching, impurities are controlled from the source, and a composite refining agent is matched with mechanical vibration and vacuum degassing to cooperate, so that the production efficiency is improved. And the non-metal impurity removal rate is increased, the cast ingot purity is improved, the mechanical property is stable, and the high-end secondary aluminum application requirement is met.

The utility model provides a wafer cleaning device, which belongs to the field of semiconductor equipment, and can effectively heat a liquid supply piece through the arrangement of a heating piece, thereby effectively preventing the formation of ammonium fluoride crystals. Due to the arrangement of the temperature detection piece and the controller, the temperature can be automatically and conveniently controlled; through the arrangement of the cooling part, rapid cooling of the liquid supply part / the liquid supply part shell can be achieved, and aging is improved; due to the arrangement of the passivation layer, reaction between ammonium fluoride crystals and metal materials can be avoided, and the probability of generation of metal impurities is reduced; by arranging the liquid supply piece shell, the liquid supply piece can be effectively protected, and reaction between the liquid supply piece and ammonium fluoride crystals is avoided; and the heat insulation piece is arranged, so that the influence of heat on the cleaning liquid in the liquid supply piece can be avoided, and ammonium fluoride crystals are effectively prevented from being generated in time. The wafer cleaning device provided by the utility model can improve the time efficiency, and can improve the productivity and quality of products.

The invention relates to the technical field of high-efficiency refining of molten metal silicon, and discloses a high-efficiency refining process of molten metal silicon under the synergistic effect of multiple fields, which comprises the following steps: S1, placing molten metal silicon in a refining device which can apply a controllable temperature gradient field and an external electric field; s2, by regulating and controlling the size and the direction of the temperature gradient field, metal impurities are directionally migrated to a low-temperature area in the melt under the action of thermal diffusion and are enriched; s3, an external electric field is applied at the same time, and non-metal impurities are directionally migrated to an electrode area and enriched under the electromigration effect by regulating and controlling the type, intensity and frequency of the electric field; s4, performing cooperative control on the temperature gradient field and an external electric field; and S5, carrying out physical isolation or online removal on the enriched impurity region. Compared with the prior art, the device and the method have the advantages that metal and nonmetal impurities are respectively driven to directionally migrate and enrich, so that efficient separation of the impurities and deep purification of the silicon melt are realized.

This invention employs a washing solution containing solvents and metal removal agents. The washing solution contains two or more solvents, the distance between the Hansen solubility parameter of the washing solution and the Hansen solubility parameter of dimethylacetamide (HSP distance) is less than 1.0, and the content of metal impurities is 0.1 × 10⁻¹¹ parts by mass relative to the total of 100 parts by mass of the aforementioned solvents and metal removal agents. ‑9 10 or more by weight 2 ×10 ‑6 The amount is less than a certain percentage by weight. The washing solution described herein can improve the removal of impurities and dirt.

The utility model relates to the technical field of reduction furnaces, and provides a crystalline silicon growth furnace with a heat preservation cover, the crystalline silicon growth furnace comprises a furnace bottom assembly, a heat preservation cover assembly and a gas circulation system, the heat preservation cover assembly covers the furnace bottom assembly, the gas circulation system is arranged on the furnace bottom assembly, and the heat preservation cover assembly covers the furnace bottom assembly. An air inlet, an air outlet and an electrode mounting opening are formed in the furnace bottom assembly, the heat preservation cover assembly comprises an inner cover and an outer cover, the inner cover is a piece made of a high-temperature-resistant non-metal material, the outer cover is a piece made of a heat preservation material, and the outer side of the heat preservation cover assembly is further covered with a double-layer water-cooling metal cover. The furnace bottom assembly comprises a double-layer water-cooling metal bottom plate and a high-temperature-resistant non-metal material bottom sleeve. The heat preservation cover assembly is arranged on the inner side of the double-layer water-cooling metal cover, the heat conduction coefficient is reduced and obviously lower than that of a traditional stainless steel cover, the heat insulation performance is remarkably improved, and energy consumption is reduced; and the inner cover is a piece made of a high-temperature-resistant non-metal material, so that metal impurity pollution is effectively avoided, and the purity of the product is effectively ensured.

The present invention aims to provide a method for preparing and applying a hydrotreating protectant for heavy residue oil, belonging to the field of catalyst preparation. The method includes the following steps: preparing an alumina sol and adding spherical carbon particles to the alumina sol; mixing the materials evenly and then forming droplets; drying and calcining the formed material to obtain an alumina support with spherical pores; hydrothermally treating the alumina support with spherical pores in an organic ammonium solution; drying and calcining the treated material to obtain another alumina support; impregnating the alumina support with an impregnation solution containing an active metal component; and drying and calcining the impregnated support to obtain the hydrotreating protectant. The hydrotreating protectant prepared by this method has large surface pores with good permeability and high internal pores that can accommodate metal impurities. This catalyst is suitable for the field of heavy residue oil hydrotreating.

The utility model discloses a shot recovery vehicle for a shot blasting machine, and relates to the technical field of shot blasting recovery. The shot material recycling vehicle of the shot blasting machine comprises a cart, a supporting device is arranged on the upper end face of the cart, a propelling device for conveying recycled shot materials is arranged on the upper end face of the supporting device, and a screening device for screening out large impurities in the recycled shot materials is arranged on the upper end face of the supporting device. An adsorption device for absorbing metal scraps doped in the shots is arranged on the lower end face of the screening device, and an impurity removal device for removing floating impurities doped in the recycled shots is arranged on the upper end face of the supporting device. Firstly, the recycled shots are put into the propelling device to be conveyed, then large non-metal impurities in the recycled shots are screened out through the screening device, then metal chippings doped in the recycled shots are screened out through the adsorption device, and finally the non-metal impurities in the recycled shots are screened out through the impurity removal device. Therefore, the service life of the shot material is prolonged.

The utility model relates to equipment for recycling lithium carbonate from a waste ternary lithium battery, and relates to the technical field of waste lithium battery recycling. The equipment comprises a reduction roasting unit, carbonization suction filtration equipment, acid adjustment suction filtration equipment, impurity removal concentration equipment and precipitation suction filtration equipment which are connected in sequence. According to the structural design of the equipment, materials can be subjected to reduction roasting, carbonization suction filtration, acid adjustment suction filtration, impurity removal concentration and precipitation suction filtration, so that other metal impurities such as nickel, cobalt, manganese, aluminum, copper and the like can be removed, and high-purity lithium carbonate can be recovered.

The invention discloses a method for preparing battery-grade ferrous sulfate from a titanium dioxide byproduct ferrous sulfate, which comprises the following steps: (1) heating and dissolving the titanium dioxide byproduct ferrous sulfate in a solvent to form a ferrous sulfate supersaturated solution; (2) sequentially adding iron powder and sulfuric acid into the ferrous sulfate supersaturated solution, and carrying out reduction reaction; (3) adding a chelating agent into the solution obtained in the step (2), mixing, filtering, cooling, and carrying out solid-liquid separation to obtain recrystallized ferrous sulfate crystals and recrystallized saturated mother liquor; and (4) heating and dissolving the recrystallized ferrous sulfate crystal into a supersaturated solution by using a solvent, cooling and crystallizing, and repeating the recrystallization step to obtain the battery-grade ferrous sulfate. According to the method, a chemical chelation method and a recrystallization method are combined, sodium lignin sulfonate is added into the mother liquor as a chelating agent before the first recrystallization, the sodium lignin sulfonate and metal impurity ions form a stable compound, meanwhile, enrichment of the impurity ions in the mother liquor circulation process is avoided, and the purity of ferrous sulfate crystals is improved.

The invention relates to the technical field of waste battery recovery, and relates to a method for recovering a battery negative electrode material. Separating a negative electrode film layer on the negative electrode plate from the current collector; crushing, cleaning and drying the negative electrode film layer to obtain a primary negative electrode material; taking the primarily treated negative electrode material as a cathode, taking a graphite rod as an anode, and putting into a molten salt system for electrolysis; wherein the molten salt system comprises alkali metal chloride and alkaline earth metal chloride; separating a solid product obtained after electrolysis from the fused salt; and washing and drying the solid product, and recovering the dried solid product. Taking the primarily treated negative electrode material as a cathode, taking a graphite rod as an anode, and putting into a molten salt system for electrolysis; in the electrolysis process, metal impurities (lithium, copper and the like) in a negative electrode material are oxidized and dissolved at an anode to enter molten salt, and sulfur and nitrogen elements in organic matters (from a binder and the like) are converted into a doped carbon material, so that purification, structure repair and modification of graphite at a cathode are realized.

The invention discloses a method for preparing omega-aminocarboxylic acid through alkaline ring-opening reaction of cyclic lactam, which comprises the following steps: adding common inorganic alkali and a proper amount of distilled water into a reaction kettle, and stirring until the common inorganic alkali is completely dissolved to obtain a solution; then adding a certain amount of cyclic lactam, and gradually heating to reflux reaction; after the reaction is completed, cooling a solution system to room temperature, dropwise adding hydrochloric acid to adjust the pH value to 7.0, and removing water to obtain a crude product of omega-aminocarboxylic acid; and adding a crystallizing agent A and a crystallizing agent B into the crude product for recrystallization, stirring for 2 hours under a low-temperature condition to obtain a large amount of white precipitate, filtering, and drying to obtain a white solid product aminoheptanoic acid. The method is simple and convenient in process operation, good in reproducibility, high in total yield, low in product metal impurity content, economical and environment-friendly, and suitable for batch industrial production.

This utility model provides a magnetic feeder for a crusher, comprising: a feeder assembly bolted to the top of the crusher housing; a cleaning port located on the side of the crusher housing near the feeder assembly outlet; a crushing chamber guide plate located directly below the feeder assembly outlet; a magnet assembly located diagonally below the feeder assembly outlet; a magnet fixing bracket located between the feeder assembly and the crushing chamber guide plate; a swing mounting bracket connected to the magnet fixing bracket on the side near the cleaning port; the left and right sides of the swing mounting bracket connected to the inner sidewalls of the left and right sides of the crusher housing by bolts; during operation, the magnet plate is designed with a gradient magnetic field and tilted between the feeder assembly outlet and the crushing chamber guide plate, on the side through which the material channel will pass, so that metal impurities can be adsorbed onto the magnet plate; during crusher maintenance, the magnet plate is swung along the magnet track tube to the outside of the cleaning port by the swing mounting bracket to remove metal deposits from the magnet plate.

The invention belongs to the technical field of functional powder material preparation, and discloses a preparation process of high-purity silicon carbide powder, which comprises the following steps: constructing a whole-process integrated closed system from precursor ultra-purification, gas phase in-situ conversion, microstructure regulation and control to nondestructive collection; according to the method, ultra-pure silane and methane gas are obtained through two-stage cryogenic distillation and adsorption purification, after plasma activation decomposition, uniform nucleation and controllable growth are achieved in a multi-temperature-zone vertical reactor, HCl is introduced for in-situ etching purification, and finally a final product is obtained through top-speed quenching and totally-closed collection. By the adoption of the technical scheme, stable preparation of the high-purity silicon carbide powder with the total metal impurity being lower than 50 ppb, the oxygen content being lower than 100 ppm, the particle size being 0.1-2.0 microns and being precisely controllable and uniform in morphology can be achieved.

The invention discloses a high-strength magnesium-zinc-yttrium rare earth 3D printing alloy and application, and belongs to the technical field of 3D printing alloys, the high-strength magnesium-zinc-yttrium rare earth 3D printing alloy comprises the following components in parts by mass: 87.5-91.0 parts of magnesium, 6.0-8.0 parts of zinc, 2.0-3.0 parts of yttrium, 1.5-2.5 parts of gadolinium, 1.0-2.0 parts of scandium, 0.8-1.5 parts of zirconium, 0.5-1.2 parts of calcium and 0.28-0.6 part of manganese, the total mass of metal impurities does not exceed 0.15 part, and the balance is magnesium. A single metal impurity does not exceed 0.05 part; the alloy application comprises the following steps of S1, smelting and atomization, S2, screening and treatment, S3, printing forming and S4, aftertreatment. The alloy with excellent 3D printing formability, ultrahigh strength, good toughness and reliable thermal stability is developed through collaborative design of multi-component components, accurate control of key process parameters and systematic optimization of a post-treatment system; an ideal material is provided for manufacturing of light-weight and high-performance complex components in the fields of aerospace, high-end medical instruments and the like.

This invention discloses a method for purifying single-walled carbon nanotubes (SHU). The purification method includes the following steps: mixing crude SHU with a non-oxidizing acid solution in a reaction vessel; introducing gas into the reaction vessel; heating the reaction; and separating the solid and liquid phases to obtain the final product. This invention uses a non-oxidizing acid and gas bubbles to synergistically purify SHU, ensuring effective removal of metallic impurities and amorphous carbon while protecting the SHU from structural damage.

The invention belongs to the technical field of integrated circuit materials, and particularly relates to mixed resin for deeply removing metal impurities in a photoresist solution and a method thereof. The mixed resin comprises chelating resin, modified resin and macroporous adsorption resin. The method disclosed by the invention comprises the step of enabling a photoresist solution to pass through the PFA column filled with the mixed resin disclosed by the invention. The metal impurities of the photoresist solution purified by the mixed resin can be less than or equal to 15ppb, and the purified photoresist solution is neutral. The mixed resin and the method disclosed by the invention are particularly suitable for treating a photoresist solution with acid-unstable components, and have wide application prospects and good economic benefits in the field of integrated circuit materials.

The invention belongs to the technical field of zero-emission cleaning of electronic-grade chemical storage and transportation equipment, and discloses a zero-liquid and zero-solid emission dry-type cleaning system and method for the interior of a tank car. The zero-liquid and zero-solid emission dry-type cleaning system and method utilize supercritical carbon dioxide to cooperate with plug-in resorption, miniature ultrasonic cavitation, on-line barrel type filtration, a substitution type low-residue entrainer and an original manhole equal-diameter seal. The system sequentially comprises a liquid CO2 storage tank, a pressure and temperature rising unit, a static mixer, a top cover sealing assembly, an insertion type back-suction cleaning head, an on-line barrel type filtering unit, an on-line particle monitor and a PLC (Programmable Logic Controller) along a material flowing direction, the top cover sealing assembly comprises a top cover with the same diameter as the manhole flange, a stainless steel feeding / suction pipe and a quick-opening clamp, and original manhole-level sealing is formed. According to the device, insertion and sealing are completed through an original manhole or an original discharge port, after cleaning, the particle size is smaller than or equal to 10 pcs / mL, the metal impurity size is smaller than or equal to 1 ppt, the CO2 recovery rate is larger than or equal to 99%, the preparation time is smaller than or equal to 15 min, the cost is reduced by 40-70%, and the requirements of ppt-grade cleaning of 12-30 nm electronic-grade chemicals for advanced manufacturing procedures and the GB 39731-2020 national standard are met.

This invention belongs to the field of polyolefin preparation and relates to a method for preparing a polyolefin material with low metal impurities and resistance to precipitation. The method includes the following steps: (1) adding polyolefin resin raw material and fatty ketone solvent into the extraction vessel of a supercritical extraction device, introducing a gaseous medium into the extraction vessel, adjusting the temperature and pressure of the extraction vessel to make the gaseous medium be in a supercritical state, and treating the polyolefin resin raw material in a supercritical fluid; the fatty ketone solvent is C3-C 10 (1) At least one of the fatty ketone solvents; (2) Cooling and depressurizing to separate the polyolefin resin raw material from the solvent phase and drying it to obtain the polyolefin material with low metal impurities and resistance to precipitation. The method provided by the present invention has high efficiency in removing metal impurities from polyolefins and simultaneously achieves the removal and control of the content of soluble polymers, which significantly improves the purity and precipitation resistance of polyolefin resins.

The present application relates to the technical field of phosphoric acid production, and particularly relates to a method and device for purifying and preparing electronic-grade phosphoric acid by using microwave temperature control technology. The method comprises the following steps: S1, using a composite impurity removal agent to perform chemical precipitation pretreatment on industrial-grade wet-process phosphoric acid, and adjusting the concentration after solid-liquid separation; S2, performing microwave temperature control concentration on the pretreated liquid at a vacuum degree of 0.085-0.095 MPa and a temperature of 160-220 DEG C to obtain a concentrated liquid with P2O5 of 85% or more; S3, performing crystallization, sweating and chelating resin ion exchange deep impurity removal on the concentrated liquid; and S4, performing decolorization, super-clean filtration and dilution and filling to obtain electronic-grade phosphoric acid finished products. The present application also provides a special device. The present application is coupled by microwave concentration and multi-stage deep impurity removal, the concentration efficiency is improved by 30%-50%, the energy consumption is reduced by more than 30%, the finished product metal impurity is less than or equal to 10 ppb, and the finished product meets the GB / T1282-2011 standard; the device adopts high-purity PTFE anticorrosion lining to avoid secondary pollution and is suitable for large-scale industrial production.