341 results about "Metallic impurities" patented technology

The invention relates to the technical field of engineering, in particular to a geomembrane defect detection system and method under the earth and stone medium coverage condition, and the geomembrane defect detection system comprises a multi-mode adaptive sensing module, an edge calculation module, a data fusion module, a digital twinning module and a decision and application module; compared with the defects that single resistivity or geological radar detection is adopted in the prior art, interference of medium conductivity and metal impurities is likely to happen, and the deep resolution is insufficient, the scheme adopts multi-mode sensor network cooperative work, and a dynamic density layout and time-phased acquisition strategy is combined; through multi-mode complementation of an electrode array, an ultra-wideband radar, a distributed optical fiber and an MEMS vibration sensor, a dominant sensing mode is automatically switched in a conductive clay area, temperature gradient interference is avoided through night acquisition, the penetration depth is increased to 15 meters through multi-band radar fusion, and metal interference is inhibited; the detection precision and the anti-interference capability in a complex medium environment are remarkably improved, and the problems of high false alarm rate and high omission ratio of a traditional method are effectively solved.

The invention relates to the technical field of quartz sand purification, in particular to a high-purity quartz sand purification method and equipment. 2, a magnetic separation stage; 3, an acid leaching stage; 4, an ultrasonic-assisted cleaning stage; 5, a high-temperature chlorination treatment stage; according to the quartz sand purification method, various impurities such as magnetic impurities, non-magnetic metal impurities and silicate impurities in the quartz sand can be deeply removed through the synergistic effect of multiple steps such as pretreatment, magnetic separation, acid leaching, ultrasonic-assisted cleaning and high-temperature chlorination treatment, the purity of the quartz sand reaches 99.999% or above, the strict requirements of high-end fields such as semiconductors and photovoltaics are met, and the method is suitable for industrial production. The purification steps are closely linked to form a modular purification process, and meanwhile, advanced technologies such as ultrasonic-assisted cleaning and high-temperature chlorination treatment are adopted, so that the impurity removal efficiency is remarkably improved, the purification time is shortened, and the energy consumption and the use amount of chemical reagents are reduced by optimizing the process and equipment.

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 a method for preparing high-purity quartz sand by burning organic silicon as a raw material, and belongs to the technical field of synthesis of quartz sand. The method comprises the following steps: introducing purified organic silicon into a combustor, and combusting to obtain nano silicon dioxide powder; then sintering is carried out to remove moisture, hydroxyl and carbon impurities on the surface of the powder, sintered silicon dioxide powder is obtained, and acid leaching and cleaning are carried out to remove metal impurities on the surface and in the powder; roasting the cleaned silicon dioxide powder in a chlorine atmosphere to remove moisture, hydroxyl and residual metal impurities; and carrying out high-temperature densification treatment on the roasted silicon dioxide powder, and then crushing, grinding and screening to obtain the high-purity quartz sand. The particle size of the prepared high-purity quartz sand ranges from 50 micrometers to 300 micrometers, the purity is larger than or equal to 99.999%, and the apparent density is larger than or equal to 2.1 g / cm < 3 >. The method breaks through the limitation of natural mineral purification, and provides a brand new path for large-scale production of high-added-value quartz sand.

Natural renewable resources are used as raw materials, efficient and environment-friendly catalytic performance is achieved through multi-stage optimization, coconut shells, fruit shells, reeds and wood chips are used as base materials in the process, a channel template is introduced after fine crushing, a graded pore structure is constructed, and the mercury-free catalyst is prepared. Dynamic extrusion forming and program temperature control carbonization-activation technologies are adopted to form an active carbon skeleton with a high specific surface area, a pulsating pressure impregnation system is innovatively designed, ultrasonic vibration is combined to strengthen copper chloride solution permeation, deep and uniform loading of active components is realized, and a mixed pickling process is developed in a matched manner. Metal impurities are efficiently removed through the synergistic effect of hydrochloric acid and citric acid, and the obtained catalyst has three-dimensional through pore channels and high-activity component dispersity, can replace a traditional mercury-containing catalyst to be applied to the fields of vinyl chloride synthesis and the like, remarkably reduces the risk of environmental pollution, improves the reaction selectivity and prolongs the service life of the catalyst, and is suitable for industrial production. And a technical support is provided for green transformation of the chemical industry.

The invention relates to a continuous production method of high-purity tetraethoxysilane, and belongs to the technical field of tetraethoxysilane preparation. The method comprises a raw material pretreatment stage and a purification and rectification stage: in the pretreatment stage, silicon tetrachloride and ethanol are subjected to an esterification reaction in a molar ratio of 1: (3-4) under the protection of nitrogen, the pH is adjusted to be neutral through triethylamine, and triethylamine hydrochloride is removed through reduced pressure distillation; then, a cerium oxide-molecular sieve composite adsorbent with the specific surface area larger than or equal to 800 m / g and the pore diameter of 2-5 nm is adopted for dehydration under the pressure of 0.8-1.2 MPa till the water content is smaller than or equal to 5 ppm, and volatile impurities are removed through high-purity nitrogen purging; in the purification stage, metal ions and Cl are synergistically removed through a titanate modified resin layer and a nano TiOtube layer, and then step-by-step separation is performed through a four-stage differential pressure rectifying tower. Through collaborative optimization of structural design of the composite adsorbent, construction of an organic-inorganic hybrid interface of the resin layer and pressure gradient rectification, 72-hour continuous production is achieved, the single-pass yield of the product is 92%, and the total amount of metal impurities is smaller than or equal to 5 ppb.

The invention discloses a preparation method of regenerated glass fiber reinforced PA6 plastic particles based on a fan blade, and the preparation method comprises the following steps: crushing the fan blade and removing metal impurities to obtain a crushed material; the crushed material is subjected to pyrolysis treatment, and a primary treatment material is obtained; performing low-temperature oxidation treatment on the primary treatment material to obtain a secondary treatment material; the secondary treatment material is placed in an impregnating compound to be subjected to impregnating treatment, and surface-modified regenerated glass fibers are obtained; mixing the regenerated glass fiber with a resin matrix to obtain a mixed material; and melting the mixed material, and carrying out injection molding extrusion to obtain the recycled glass fiber reinforced plastic particles. According to the preparation method of the reinforced PA6 plastic particles based on the regenerated glass fibers of the fan blades, the pure glass fibers can be recycled from the fan blades, the reinforced plastic particles can be prepared after the recycled glass fibers are mixed with the resin, and further high-value utilization of recycled products is achieved.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for removing metal impurities from acidic copper-containing etching wastewater at normal temperature and pressure. The method for removing the metal impurities from the acidic copper-containing etching wastewater at normal temperature and pressure comprises the following steps: S1, adding an oxidizing agent into the acidic copper-containing etching wastewater to carry out oxidation-reduction reaction to obtain a pretreatment solution; and S2, phosphoric acid or soluble phosphate is added into the pretreatment solution, the pH is adjusted to 1.3-1.7 through a pH adjusting agent, stirring and filtering are conducted, and the purified copper-containing solution is obtained. According to the method, the removal rate of Fe, Ni, Zn, Ca and Mg is high, high-content copper ions can be kept, a high-purity copper salt product can be recycled and regenerated to be applied to the fields of food, cosmetics, medical treatment, electroplating and the like, hazardous waste can be reduced, economic benefits are improved, and cost is greatly reduced.

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 relates to a semiconductor device manufacturing technology, and aims to provide a preparation method of refined coke powder and high-purity isostatic pressing graphite. The method comprises the following steps: by taking calcined petroleum coke or calcined pitch coke as a raw material, crushing and grinding to obtain primary coke powder, then carrying out high-temperature halogen impurity removal treatment in a continuous heating manner, and introducing Freon gas in the process; cooling to obtain impurity-removed coke powder; and carrying out dispersion, grinding, shaping treatment, airflow classification and magnetic separation to obtain refined coke powder. According to the method, the impurity content is greatly reduced from the raw material end, the situation that a large number of metal impurities generated during smashing and grinding treatment cannot be eliminated in the graphitization process due to the fact that the metal impurities are located below the surface layer of a blank can be avoided, and the internal impurity content of a final graphite product is smaller than 20 ppm; higher tap density can be obtained, and a better mixing and kneading effect is realized; the porosity of an isostatic pressing graphite product can be reduced, the microstructure of a graphite material is effectively improved, and the corrosion resistance of the graphite material is effectively improved.

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 provides a method for purifying silicon from an organic silicon synthesis waste contact body and application of the method in preparation of a silicon-based alloy. The method comprises the following steps: pickling the waste contact body by using acid liquor; acid liquor is added into the silicon enriched material obtained through acid pickling separation, acid leaching slurry is obtained, the acid leaching slurry is diluted, and waste contact electrolyte is obtained; adjusting the pH value of the waste contact electrolyte to 5.5-6.5, and introducing the waste contact electrolyte into an electrolytic cell; introducing oxygen-containing gas near a cathode plate of the electrolytic bath, and introducing direct current on an electrode plate of the electrolytic bath to carry out electrolytic reaction; adjusting the pH value of the electrolyte in the electrolytic bath to 7.0-7.5, and continuing the electrolytic reaction to obtain a metal precipitate; and separating the liquid part and the precipitation part in the electrolytic bath, adding water into the precipitation part, fully stirring, and carrying out centrifugal separation, washing and drying treatment to obtain the silicon powder. According to the method, metal impurities and organic matters in the waste contact bodies can be effectively removed, high-purity silicon is obtained, and the high-quality silicon-based alloy is prepared.

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.

The invention belongs to the technical field of secondary batteries, and particularly relates to a regeneration method of a lithium iron phosphate positive electrode material and a regenerated lithium iron phosphate positive electrode material. The regeneration method of the lithium iron phosphate positive electrode material provided by the invention comprises the following steps: pyrolyzing the lithium iron phosphate positive electrode material to be repaired to remove volatile impurities; carrying out activating treatment on a pyrolysis product and an activating agent; dissolving out metal impurity ions from the activated product in organic acid, and filtering, washing and drying to obtain a purified activated product; and mixing the purified activated product with a lithium source and a carbon source, and sintering. Impurities in the waste lithium iron phosphate positive electrode material are further removed through low-temperature pyrolysis, activation, metal impurity ion removal and sintering, crystal structure defects are repaired, the obtained regenerated lithium iron phosphate is high in purity and complete in crystal structure, the specific capacity and cycle performance of the lithium iron phosphate positive electrode material are improved, and the service life of the lithium iron phosphate positive electrode material is prolonged. The performance level equal to that of a commercial lithium iron phosphate positive electrode material is achieved.

The invention relates to the technical field of positive electrode material precursors, in particular to a method for preparing battery-grade iron phosphate by taking titanium dioxide waste acid as a raw material and application of the battery-grade iron phosphate. Hydrolysis waste acid in the titanium dioxide industry is selected as the raw material, ammonia gas is used as a pH regulator, and phosphorus salt and hydrogen peroxide are used as precipitants; the solubility product constants of aluminum phosphate and titanium phosphate are small, Al < 3 + > and Ti < 4 + > in the hydrolysis waste acid are precipitated by adopting soluble phosphate and then are filtered and removed, iron ammonium phosphate is precipitated by virtue of phosphorus salt and is fully washed, and the content of metal impurity ions can be reduced to be less than 100ppm; according to the method, ferrous sulfate is subjected to fractional precipitation, impurity removal, precipitation, washing and aging under different pH conditions, so that the use amount of alkaline substances is greatly reduced, and the problems of high liquid waste treatment cost and resource waste in the traditional titanium dioxide industry are solved.

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.

The invention discloses an electrical control method and system for wind power blade recovery equipment, and relates to the technical field of signal processing. The method comprises the following steps: cooperatively acquiring a leaf material characteristic signal through a multi-source sensor, and extracting fiber distribution and interlayer bonding strength parameters after de-noising; calculating a segmented recovery value coefficient based on material characteristics, and generating an optimal cutting path by adopting a dynamic programming algorithm; dynamically deducing a kinetic energy compensation value according to a sound wave separation signal and a strain signal fed back by the cutting actuator, and performing closed-loop regulation and control on the driving power and the feeding speed; according to a recovery value coefficient and crushing power consumption associated with the feeding speed, synchronously deciding a target crushing granularity, and adjusting the centrifugal force of a crushing roller and the opening degree of a classifying screen in a linkage manner; the comminution parameter or the cutting path is prioritized based on the deviation of the screening particle size index from the residual amount of the metal impurities. The method can effectively improve the purity and the resource utilization rate of the blade recovery material.

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.

The invention provides a method for preparing formamidine hydriodate through a one-pot method, formamidine hydriodate and application of formamidine hydriodate, and particularly relates to the technical field of perovskite photovoltaic cell precursor material preparation. The method comprises the following steps: adding an iodine elementary substance and a solvent into a reaction container, dropwise adding a reducing agent to carry out a first reaction, adding formamidine acetate in batches to carry out a second reaction at 0-10 DEG C after the reaction is completed, and carrying out post-treatment purification after the reaction is completed to obtain the formamidine hydriodate. The method directly selects the iodine elementary substance as the raw material, so that the use cost of the raw material is effectively reduced; one-pot integrated reaction is adopted in the preparation process, intermediate separation is not needed, the opportunity that metal impurities are introduced due to multiple transfer and purification operations in a traditional method is reduced, and the content of the metal impurities in the product can be reduced; distillation and other steps with high energy consumption and long time consumption are omitted, so that the reaction period is shortened, and the energy consumption is reduced.

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 invention discloses a cleaning device for an electrolytic cathode roller based on copper foil production, and relates to the technical field of roller type cathode copper foil production.The cleaning device for the electrolytic cathode roller based on copper foil production comprises a cathode roller, supporting frames are symmetrically installed on one side of the cathode roller, and a roller core is rotatably installed on the supporting frames; a plurality of arc-shaped magnetic blocks are installed on the roller core, the outer sides of the arc-shaped magnetic blocks are sleeved with protective sleeves and viscous sleeves, two adjusting frames are symmetrically installed on the side close to the supporting frame, hollow rollers are rotatably installed on the adjusting frames, and the hollow rollers are sleeved with viscous silicon rubber sleeves. The arc-shaped magnetic block and the viscous sleeve on the roller core rotate oppositely to the cathode roller, magnetic metal particles on the surface of the cathode roller are adsorbed by magnetic field force, non-metal impurities on the surface of the cathode roller are adsorbed by the viscous sleeve, and meanwhile, the hollow roller drives the viscous silicon rubber sleeve to rotate, so that impurity particles on the surface of the viscous sleeve are adsorbed to the surface of the viscous silicon rubber sleeve.

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.