133results about How to "Low impurity content" patented technology

This invention relates to the field of hafnium carbide technology and discloses a thermal decomposition preparation process for hafnium carbide precursors. The process includes: dissolving hafnium tetrachloride in anhydrous ethanol, adding propylene oxide dropwise for neutralization and acid removal to obtain a neutral ethanol-hafnium precursor solution; adding ethyl acetoacetate methacrylate and heating for coordination to obtain a hafnium coordination monomer solution; adding acrylonitrile and an initiator and heating for polymerization; when the viscosity of the reaction solution increases, injecting a dimethyl sulfoxide hot solution of melamine as a locking liquid; precipitating, separating, and drying to obtain the hafnium carbide precursor; and after oxidative crosslinking treatment, calcining at high temperature under an inert atmosphere to undergo carbothermic reduction to obtain hafnium carbide powder. This invention achieves molecular-level dispersion of precursor components through liquid-phase coordination and in-situ network locking, effectively reducing the reaction temperature and inhibiting grain agglomeration, thus producing high-purity, ultrafine hafnium carbide powder.

This invention provides a method for producing high-purity aluminum-niobium-tantalum master alloys and co-producing ammonium fluoride, belonging to the fields of metallic materials and inorganic chemicals. The invention involves mixing fluoroniobic acid, fluorotantalic acid, and ammonia water for a precipitation reaction to obtain a precipitate and an ammonium fluoride solution. The ammonium fluoride solution is then concentrated, cooled for crystallization, dehydrated, and dried sequentially to obtain ammonium fluoride. The precipitate is then dried and oxidized and calcined sequentially to obtain an oxide. The oxide, aluminum powder, potassium chlorate, and calcium fluoride are mixed and subjected to a vacuum aluminothermic reaction to obtain the high-purity aluminum-niobium-tantalum master alloy. This invention, considering both broadening the range of raw material selection and optimizing the production process, reacts fluoroniobic acid, fluorotantalic acid, and ammonia water to produce niobium hydroxide and tantalum hydroxide precipitates, which are then oxidized and calcined to form niobium and tantalum oxides. The high-purity aluminum-niobium-tantalum alloy is then prepared using a vacuum aluminothermic reaction. Simultaneously, ammonium fluoride can be co-produced, resulting in high raw material utilization.

This application discloses magnetothermal-induced antibacterial nanoparticles, their preparation method, and applications, relating to the field of medical antibacterial nanomaterials. The nanoparticles are prepared by the following method: Co3B and hexadecyltrimethylammonium bromide are weighed, stirred, and centrifuged to obtain uniformly dispersed Co3B particles. Then, the Co3B particles and CoSb3 are added together to a solvent, stirred to dissolve, centrifuged, washed, and dried to obtain Co3B / CoSb3 nanoparticles. The mass ratio of Co3B to hexadecyltrimethylammonium bromide is 1:5–1:8; the mass ratio of Co3B to CoSb3 is 1:3–1:4. This invention's nanocomposite material utilizes the magnetothermal effect to rapidly generate heat for quick sterilization; on the other hand, the magnetothermal effect creates a localized temperature difference, which is converted into a potential difference, thereby exerting a thermoelectric effect to continuously generate reactive oxygen species, thus synergistically enhancing the antibacterial effect against pneumonia pathogens.

This invention relates to the field of mining environmental protection equipment technology, and more particularly to a separable mining carbon neutralization device. The separable mining carbon neutralization device provided by this invention solves the technical problem of poor operational stability in existing mining carbon neutralization devices. The separable mining carbon neutralization device includes a pre-stage component for separating carbon dioxide from gas, a post-stage component for adsorbing the carbon dioxide separated by the pre-stage component, and a gas pump. By setting a separation membrane to separate carbon dioxide from the gas, the gas entering the post-stage component has a higher carbon dioxide content and lower impurity content, which facilitates rapid adsorption of carbon dioxide by the adsorbent, thereby improving the stability of the mining carbon neutralization device during operation and increasing the gas treatment efficiency.

A flue gas desulfurization device of desulfurization absorption tower external crystallization, comprising the following units, a flue gas desulfurization unit: comprising a main flue gas duct subunit, a desulfurization absorption subunit; a flue gas evaporation crystallization unit: comprising a secondary flue gas duct subunit, an evaporation crystallization subunit and a solid-liquid separation subunit connected in sequence; the desulfurization absorption subunit comprises a desulfurization absorption tower, a circulating pump, a circulating tank, a desulfurizer supply device, a process water supply device and an oxidizing air supply device; the main flue gas duct subunit comprises a pipeline connected to the desulfurization absorption tower as an inlet and outlet flue; a boiler induced draft fan and a damper are connected in series on the pipeline; one pipeline of the main flue gas is connected to the desulfurization absorption tower, and another pipeline is connected in parallel to a crystallization booster fan and a flue which is connected to the evaporation crystallization subunit; the evaporation crystallization subunit is additionally provided with two pipelines connected to the desulfurization absorption tower, one of which is used to introduce a desulfurization byproduct solution from the desulfurization absorption tower, and the other of which is used to return low-temperature flue gas to the desulfurization absorption tower.

The invention discloses a temperature control method for processing graphite by using double plasma sources, and relates to the technical field of plasma material processing, in particular to a temperature control method for processing graphite by using double plasma sources, which comprises the following steps: adopting a cylindrical reactor, and arranging a plasma source I and a plasma source II up and down along the axial direction on two sides of the cylindrical reactor, and an outlet of the powder feeding mechanism directly faces a core high-temperature area of the plasma source I, so that graphite powder directly enters a heating area. The two sources are connected in series up and down to construct a continuous relay type high-temperature path. The center distance between the powder feeding port and the source I is limited not to exceed half of the outlet diameter of the reactor, the center distance between the two sources is 1-2.5 times of the outlet diameter, and the center distance between the source II and the outlet is larger than 5 times of the diameter; the flow of the second source is 1.2-1.8 times that of the first source, the temperature of the core area is maintained to be 8000-10000 K by adjusting the flow ratio, and the total power does not exceed 100 kilowatts. The total retention time of the graphite powder in a two-source high-temperature area is longer than 0.2 second, the diameter of an outlet of the reactor is 100-400 mm, the reactor is made of high-temperature-resistant stainless steel or graphite, and accurate control over the graphite treatment temperature is achieved.

This utility model provides a wastewater cooler with a pipe anti-clogging device, including a wastewater cooler body. An outlet pipe and an inlet pipe are connected to both ends of the wastewater cooler body. The inlet end of the inlet pipe is connected to a filter pipe via a bent connecting pipe. A slag collection pipe seat is connected to the end of the filter pipe away from the bent connecting pipe. A support column is installed at the bottom inside the slag collection pipe seat, and a turbine housing is installed on the support column. A turbine is installed inside the turbine housing, and the turbine is rotatably connected to the inner wall of the turbine housing via a rotating shaft. This utility model, by installing a filter pipe at the inlet end of the wastewater cooler body, can filter the wastewater entering the wastewater cooler body, ensuring that the filtered wastewater does not contain large particles of impurities, preventing excessive impurities from clogging the wastewater cooler. A conical filter screen is installed inside the filter pipe to further filter the passing wastewater, reducing the impurity content in the wastewater.

This invention discloses a compound preparation for treating vascular dementia and its preparation method. The active pharmaceutical ingredient consists of protopanaxadiol and gallic acid in a 1:1 mass ratio, and the dosage form is liposomes. The preparation method includes extraction, mixing, liposome preparation, and optional freeze-drying steps: protopanaxadiol and gallic acid are extracted and purified from ginseng rhizome and Terminalia chebula fruit, respectively. After mixing, they are combined with phospholipids and cholesterol to prepare a lipid membrane. The membrane is then homogenized by hydration, low-temperature ultrasound, and high-pressure microfluidic jet to obtain a homogeneous liposome suspension, which can be further freeze-dried into a freeze-dried powder. The 1:1 composition of protopanaxadiol and gallic acid targets multiple points on the pathological mechanism of vascular dementia, showing significant therapeutic effects and broad application prospects. This preparation uses a liposome dosage form to improve the bioavailability of the active ingredient, the preparation process parameters are controllable, the active ingredient has high purity, the liposomes have uniform particle size, high encapsulation efficiency, and good stability.

The invention provides an efficient and energy-saving magnetic suspension fan and an operation method, and relates to the field of magnetic suspension fans, the efficient and energy-saving magnetic suspension fan comprises a double-end impeller driving part, a first-stage air inlet pipe orifice, a positioning mounting plate, a first-stage air outlet volute, a second-stage air inlet pipe orifice, a second-stage air outlet volute and a shunt connecting pipeline; the primary air inlet pipe orifice is in bolted connection with the left side of the double-end impeller driving part; the first-stage air outlet volute is in bolted connection with the left side of the double-end impeller driving part; the secondary air inlet pipe orifice is in bolted connection with the right side of the double-end impeller driving part; the second-stage air outlet volute is in bolted connection with the right side of the double-end impeller driving part; the positioning mounting plate is fixedly connected to the inner side of the primary air inlet pipe orifice; the flow dividing connecting pipeline is fixedly connected to the front side of the second-stage air outlet volute. The occurrence probability of fan surge faults caused by filter element blockage is reduced, and the problem that fan surge is triggered after the air inlet density and the effective air inlet amount are easily affected by filter element blockage is solved.

This invention discloses a multi-stage residual film separation device, comprising a feeding belt, a first separation mechanism, a shredding and separation mechanism, a second separation mechanism, a discharge belt, and a collection tank. The shredding and separation mechanism is equipped with an inlet, an upper discharge outlet, and a lower discharge outlet. The feeding belt and the discharge belt are respectively connected to the inlet and lower discharge outlet of the shredding and separation mechanism. The second separation mechanism is connected to the upper discharge outlet of the shredding and separation mechanism. The first separation mechanism is connected to the feeding belt. A collection tank is provided at the outlets of the first and second separation mechanisms. This invention employs a multi-stage separation method to separate different types of residual film, achieving effective separation of different types of residual film. This avoids both excessive impurities in the separated residual film and excessive residual film in the waste impurities, thus preventing resource waste.

The application belongs to the technical field of medical isotope production, and relates to a recovery and purification method of a target material, in particular to a recovery and purification method of a nickel target material in a Cu-64 preparation process. An acid is added to a recovered nickel solution in the Cu-64 preparation process to adjust the hydrogen ion concentration to 6-8 mol / L, so as to obtain an acidic nickel solution; a TK201 resin is used to perform one-column separation on the acidic nickel solution, so as to obtain effluent; and an AGMP-1 resin is used to perform two-column separation on the effluent, so as to obtain a recovered and purified nickel solution. The recovery and purification method can significantly reduce Cu, Co and other impurities, greatly improve the purity of nickel in the recovered nickel target material, and has a high nickel recovery rate.

The utility model discloses ingredient mixing equipment for detergent production, and relates to the technical field of detergent production. The device comprises a mixing barrel, a mixing assembly is arranged in the mixing barrel and comprises a mixing hopper arranged in the mixing barrel in a sleeved mode, a filter plate is arranged on the upper surface of the mixing hopper, a rotating shaft is vertically and rotatably connected to the middle of the mixing hopper, and the upper end of the rotating shaft penetrates through the middle of the filter plate. Stirring rods connected with the peripheral side of the rotating shaft are positioned in the mixing hopper; and a stirring assembly is arranged at the lower part of the mixing barrel. The mixing assembly is arranged to separate impurities in detergent raw materials, the purity of the detergent raw materials is improved, the quality of detergent finished products is improved, the stirring assembly is arranged, a driving structure does not need to be additionally arranged, the number of motors is reduced, and the motor overhaul workload is reduced.

The invention discloses a preparation method of cinacalcet hydrochloride. The preparation method comprises the following steps: 1) carrying out a reaction on 3-(3-trifluoromethylphenyl) propanol and phosphorus oxychloride; first post-treatment: extracting the product obtained in the step 1) by using an organic solvent, drying and concentrating to obtain 1-(3-chloropropyl)-3-trifluoromethyl benzene; (2) carrying out substitution reaction on the 1-(3-chloropropyl)-3-trifluoromethyl benzene obtained by the first post-treatment and (R)-1-(1-naphthyl) ethylamine; the product obtained in the second step is subjected to extraction, drying and concentration through an organic solvent and then subjected to a salt forming reaction with hydrochloric acid, and cinacalcet hydrochloride is obtained.According to the method, it is guaranteed that the product has the good yield and high purity, meanwhile, the impurity content, especially oxidation impurities, is remarkably reduced, and the appearance color and luster of cinacalcet hydrochloride are effectively improved.

The invention relates to the technical field of metallurgy, in particular to a preparation method of a high-nitrogen vanadium-nitrogen alloy and the high-nitrogen vanadium-nitrogen alloy.The preparation method comprises the following steps that 1, wet-based industrial-grade ammonium vanadate, a graphite carbon powder reducing agent, a metal iron powder catalyst and a water-based binder are mixed and stirred according to the mass ratio of 100: (18-22): (0.2-0.5): (8-20), and a mixture is obtained; 2, the mixed material is subjected to compression molding, and a preformed material is obtained; and 3, the preformed material is sequentially subjected to low-temperature pre-sintering dehydration treatment, high-temperature nitridation reduction treatment and cooling annealing treatment, and the high-nitrogen vanadium-nitrogen alloy is obtained. According to the preparation method, industrial-grade wet-based ammonium vanadate is directly adopted as a raw material, pretreatment is not needed, and the production cost is further reduced.

The utility model relates to an underground garage drainage structure which comprises an underground foundation pit with a hollow interior and an open top, a water collecting well is arranged in the middle of the interior of the underground foundation pit, a parking space is arranged at the top of the water collecting well, a water collecting groove is formed between the water collecting well and the underground foundation pit, and a plurality of water filtering assemblies covering the opening of the water collecting groove are arranged at the top of the water collecting groove. A water suction pump is installed on the side, away from the water inlet pipe, of the water collecting well, and a water outlet of the water suction pump communicates with a water outlet pipe extending out of the water collecting well. Through the water filtering assembly and the water collecting well, the problems that an existing drainage structure is poor in filtering effect and disordered in water flow are solved, meanwhile, installation and maintenance are convenient and fast, the drainage efficiency and stability of the underground garage are effectively improved, and the maintenance cost is reduced.

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

The present disclosure relates to a method for detecting vitamin D or a steroid hormone and a blood sample pretreatment kit. The method for detecting vitamin D in blood comprises pretreating a blood sample to obtain a test sample, and detecting the test sample by liquid chromatography tandem mass spectrometry, wherein the pretreatment comprises: adding an internal standard solution and a magnetic bead reagent to the blood sample to obtain a mixed solution and incubating to allow the target analyte to bind to the surface of the magnetic beads; separating the magnetic beads combined with the target analyte; and eluting the target analyte from the surface of the magnetic beads to obtain the test sample, wherein the mixed solution comprises methanol in an amount of 45vol% to 60vol%, or ethanol in an amount of 30vol% to 50vol%. The method can significantly reduce non-specific adsorption of magnetic beads, and improve the accuracy and sensitivity of detection.

The application belongs to the technical field of lithium ion battery ternary precursors, and particularly relates to a high specific surface area high-nickel ternary precursor oxide as well as a preparation method and application thereof. The high specific surface area high-nickel ternary precursor oxide prepared by the method has a larger specific surface area, which can reach 180.19 m 2 / g, a high tap density, and loose and porous particles, and has high overall consistency, and can effectively improve the electrochemical performance of the positive electrode material when the positive electrode material is prepared. By adjusting the temperature and time of the calcination process, the application effectively reduces the moisture and organic impurity content, improves the sphericity of the later forming, effectively adjusts the half-peak of the ternary precursor oxide, and controls the specific surface area. By oxidizing the loose and porous high-nickel ternary precursor hydroxide, the structure of the ternary precursor oxide prepared is more stable, and the advantage is greater in the preparation of the subsequent ternary positive electrode material.

The utility model provides a sheet forming machine with a filtering device, which belongs to the technical field of sheet forming machines, and comprises a heating pipe, the filtering device, a metering pump and a forming frame, the filtering device comprises a box body, a filtering frame and a driver, the filtering frame is arranged in the box body in a sliding manner, at least two channels are arranged on the filtering frame, and the driving device drives the filtering frame to rotate. An isolation part is arranged between every two adjacent channels, a filter cartridge is arranged in each channel, the driver is used for driving the filter frame to move, so that each channel can be respectively communicated with the heating pipe, and the heating pipe is blocked by the isolation parts in the switching process; liquid plastic is filtered through the filtering device, the content of impurities in finished sheets is reduced to a great extent, meanwhile, the adjustable filtering device is adopted, alternate use of a plurality of filtering nets or continuous use of different filtering nets can be achieved, the filtering effect is improved, and the service life of equipment is prolonged.

The utility model discloses an anhydrous sodium sulfate processing and purifying device which comprises a supporting base, a dissolving barrel, a filter and a processing box, after the dissolving barrel is fixed on the supporting base, the top of the dissolving barrel is communicated with the feeding pipe and the solvent pipe, and after raw materials enter the dissolving barrel through the feeding pipe, a chemical solvent enters the dissolving barrel through the solvent pipe and is fully mixed under the cooperation of the heating plate on the inner wall of the dissolving barrel; the mixed solution enters the filter on the supporting base through the material pipe, the filter filters out impurities and then guides the solution into the treatment box, a temperature control mechanism in the treatment box is matched to concentrate and crystallize the solution, one side of the treatment box is communicated with a discharge valve, and the top end of the other side of the treatment box is communicated with a one-way exhaust valve. Compared with the prior art, the device has the advantages that by adding a chemical agent into the dissolving barrel, insoluble compounds formed by heavy metals are precipitated, and the impurity content in a product can be remarkably reduced by matching with the filter.

The invention discloses a process method for producing sodium sulfide from solid waste after waste lithium battery treatment. The process method comprises the following steps: step 01, material preparation section; 02, a preheating section; step 03, a calcining section; step 04, a heating section; step 05, evaporation section; step 06, a product packaging section; and pumping the sodium sulfide concentrated solution into a tabletting machine in a tabletting and packaging section, cooling and solidifying the sodium sulfide concentrated solution into a solid, blanking, slicing and packaging into a sodium sulfide product. According to the invention, resource utilization of the graphite slag as the solid waste is realized, and the economic benefit of the waste lithium battery product is improved. In the whole sodium sulfide production process method, a raw material preheating method and an indirect heating external heating type calcining rotary furnace are adopted, so that substances such as oxygen in water vapor and flue gas are not in contact with a reaction mixture, and side chemical reactions causing generation of impurities such as sodium carbonate, sodium thiosulfate or sodium polysulfide are avoided as far as possible from the source; therefore, the yield of the product is improved, the impurity content in the product is low, and the purity of the product is improved.

The application discloses a vehicle-mounted snake venom processing device and a method for processing snake venom by using the same. The vehicle-mounted snake venom processing device comprises a vehicle body, a workbench and a power supply device arranged in the vehicle body, and the workbench is provided with a separation device, a drying device, a detection device and a storage device. The drying device comprises a vehicle-mounted freeze dryer and an oil-free vacuum pump, and the crude snake venom separated by the separation device is subjected to freeze drying to obtain freeze-dried snake venom powder. The detection device comprises one or more of an enzyme label instrument, an ultraviolet spectrophotometer and a moisture tester for detecting biochemical indexes of the freeze-dried snake venom powder. The storage device is used for storing the freeze-dried snake venom powder which passes the detection. The vehicle-mounted snake venom processing device has a compact structure and is convenient to move and use, is suitable for collecting and processing snake venom in the scattered snake breeding of present snake breeders, significantly shortens the snake venom processing time, effectively retains active ingredients of the snake venom, improves the medicinal value of the snake venom, and is favorable for classified storage of the snake venom through on-site detection and analysis.

This application discloses a multi-stage filtration device for inorganic pigment production, belonging to the technical field of inorganic pigment production equipment. It includes a device body, internally comprising a primary filtration unit, a secondary cyclone unit, a precision filtration unit, and a heating module. The design is novel and the device ingenious. The slurry enters the coarse filter screen through the feed inlet. A vibrating motor prevents screen clogging. After preliminary filtration, the slurry enters the cyclone chamber, where centrifugal force separates medium-sized particles. Finally, it undergoes precision filtration through a sintered filter element. The backwash pipeline periodically reverse-flushes the filter element, triggering a backwash program every two hours for 30 seconds. Before shutdown, the feed is shut off, and the backwash is run three times. This improves filtration accuracy and effectively reduces the impurity content of the finished product. The backwash design extends the filter element's lifespan and maintenance cycle. The synergistic effect of cyclone and vibration increases the throughput when processing high-viscosity slurries, greatly enhancing the device's practicality.

The invention belongs to the technical field of hydrometallurgy and comprehensive utilization of resources, and relates to a method for extracting lithium from lepidolite at normal pressure and high efficiency based on synergistic activation and targeted impurity removal. The method comprises the following steps of mechanochemical activation-pre-deconstruction, hydrochloric acid normal-pressure reinforced leaching, fluorine and aluminum synergistic precipitation and recycling, deep removal of iron, calcium and magnesium targeted precipitation and lithium recovery. According to the method disclosed by the invention, the lithium extraction process is optimized, and the lepidolite concentrate is subjected to crystal pre-deconstruction by combining mechanical and chemical activation, so that extremely high reaction activity is created for subsequent acid leaching reaction under normal pressure; then, fluorine, aluminum and iron are removed by accurately controlling reaction conditions, and finally, a composite precipitator is added to deeply remove calcium and magnesium. The lithium extraction and impurity removal method is simple in technological process, high in lithium recovery rate, low in impurity content and wide in applicability.

The application belongs to the technical field of medical intermediates, and relates to a production method of a clotrimazole intermediate (2-chlorophenyl)diphenylmethanol. In the method, 2-methyltetrahydrofuran or cyclopentyl methyl ether is used as a reaction solvent, an ethyl o-chlorobenzoate solution is added dropwise into a phenyl magnesium bromide solution with a concentration of 2.5-3.5 M under the conditions of 60-80 DEG C and inert atmosphere, the reaction is continuously carried out after the dropwise addition is completed, a water solution of a quenching agent is added after the reaction to quench, then, liquid separation is carried out, and the organic phase after the liquid separation is concentrated to obtain a crude product; the crude product is refined by using a reaction solvent and petroleum ether, and (2-chlorophenyl)diphenylmethanol is obtained. The production method can efficiently and stably produce high-quality (2-chlorophenyl)diphenylmethanol, reduces production cost and safety hazards, and can be used for large-scale industrial production.

The utility model belongs to refractory material technical field, concretely relates to a novel white corundum clinker kiln car heat preservation system, including tunnel kiln and the square corundum brick layer, corundum castable layer, hollow ball castable layer and high alumina fibre blanket that set up on the kiln car, the high alumina fibre module is uniformly distributed in the kiln car top edge and tunnel kiln inner wall, work, the white corundum clinker that will be removed from the receiving car is placed on the kiln car, through the kiln car with white corundum clinker is transferred to tunnel kiln and is kept warm for a certain time, delays the heat loss of white corundum clinker, prolongs white corundum clinker cooling crystallization process, improves the bulk density of clinker, reduces the impurity content of white corundum, increases the content of alumina content, improves the use performance of white corundum in refractory products.

This invention discloses a method for side-stream extraction of refined tetracyclododecene, comprising: using dicyclopentadiene, ethylene, and norbornene as raw materials, and toluene as solvent, conducting a Diels-Alder reaction in a batch reactor to obtain crude tetracyclododecene product; removing ethylene, norbornene, and toluene from the crude product by atmospheric distillation, and then sending it to a vacuum distillation column; in the vacuum distillation column, dicyclopentadiene and tetracyclododecene products are obtained at the top of the column, high-purity tetracyclododecene product is obtained by side-stream extraction, and heavy components are removed from the bottom of the column.

The invention relates to the technical field of castable, in particular to high-performance tundish cover castable based on high-aluminum ceramic chip recycled aggregate and a preparation method of the high-performance tundish cover castable. The castable comprises high-aluminum ceramic chip recycled aggregate, modified hollow alumina microspheres, andalusite and other components, and through roasting stabilization treatment of the recycled aggregate and multi-layer coating modification of the microspheres, the problems of poor heat preservation property and concentrated thermal stress caused by high doping amount of the recycled aggregate are solved. The andalusite cooperates with the modified microbeads to optimize aggregate-andalusite-microbead three-phase interface combination by virtue of the low-expansion characteristic and the active surface, so that the thermal shock resistance and the structural compactness are enhanced. The product has excellent heat preservation and heat insulation performance, high strength and slag corrosion resistance, resource efficient utilization of waste high-aluminum ceramic chips is achieved, and the service life of the tundish cover is prolonged.

The utility model relates to an ultra-pure polyolefin powder preparation device which comprises a crushing unit and a screening unit, and the crushing unit comprises a pulverizer provided with a grinding part; the screening unit comprises a cyclone separator, a vibrating screen and a magnetic filter arranged at the discharging end of the vibrating screen. A discharge port of the flour mill is communicated with a feed port of the cyclone separator through a feeding pipeline; and a material return port of the vibrating screen is communicated with the flour mill through a material return pipeline and is used for returning screen residues of the vibrating screen to the flour mill. According to the device, large-particle polyolefin materials are crushed, screened and demagnetized, and the utilization rate of the materials and the added value of products are improved.

This utility model discloses a goji berry residue collection device for a goji berry pressing machine, including a goji berry pressing machine. The residue from the machine's discharge end is conveyed to a vibrating screen via an elevator. The vibrating screen is equipped with a primary and a secondary screen. The residue is screened out through the primary screen, and the seeds are screened out through the secondary screen. This goji berry residue collection device disperses the pressed and agglomerated residue through the vibrating screen, separates the seeds to be recovered, and other impurities such as peels and stems enter a drying device. After drying, the peels and seeds shrink and dry due to water loss, weakening their binding force. After being conveyed by air, they collide in the separation chamber, separating the peels and seeds. The seeds are then recovered by air separation and returned to the vibrating screen for further processing. This method results in low impurity content and high recovery rate in the recovered seeds.