232results about How to "Low impurity content" patented technology

The invention belongs to the technical field of lithium recovery, and particularly relates to a method for extracting and preparing lithium carbonate from a low-concentration lithium solution, which comprises the following steps: 1) extraction: extracting lithium ions in a water phase by using an extraction organic phase to obtain a loaded organic phase and raffinate; 2) back extraction: back-extracting the loaded organic phase by using a back-extraction water phase, and introducing CO2 gas in the back-extraction process, so that lithium ions are transferred from the loaded organic phase to the back-extraction water phase and are crystallized at the same time, and then carrying out phase separation to obtain a lithium carbonate solid; and 3) post-treatment: washing and drying the lithium carbonate solid to obtain the electronic-grade lithium carbonate ultrafine powder. According to the method, lithium-sodium separation and lithium enrichment are effectively realized by controlling extraction and back extraction conditions, meanwhile, a lithium carbonate preparation process and a back extraction process are synchronously carried out, the grain diameter of lithium carbonate is effectively regulated and controlled, a lithium carbonate product with low impurity content and fine granularity is obtained, the problem that a low-concentration lithium-containing solution is difficult to recover is solved, and the method is suitable for industrial production. The method has the advantages of high efficiency, environmental protection and low cost.

The invention discloses a preparation method of battery-grade lithium hydroxide monohydrate, which comprises the following steps: causticizing a lithium sulfate concentrated solution, freezing and crystallizing to obtain a frozen solution, precisely filtering the frozen solution, filtering by adopting an alkali-resistant nanofiltration membrane, collecting a penetrating fluid, and when the permeability of the alkali-resistant nanofiltration membrane is reduced, filtering by adopting an alkali-resistant nanofiltration membrane to obtain the battery-grade lithium hydroxide monohydrate. The alkali-resistant nanofiltration membrane is cleaned by lithium bicarbonate thermal decomposition mother liquor of a lithium carbonate production line, and all collected penetrating fluid is subjected to evaporative crystallization and centrifugal drying to obtain the battery-grade lithium hydroxide monohydrate. By adopting a method of nanofiltration membrane impurity removal and primary evaporative crystallization, the nanofiltration membrane impurity removal is used for replacing the primary evaporative crystallization in the prior art, so that the energy consumption can be effectively reduced, the production cost is saved, the Si content of the nanofiltration solution is lower than 3ppm and lower than that of the primary evaporative crystallization heavy solution, and the method can be used for preparing high-quality battery-grade lithium carbonate. The Si content of the prepared lithium carbonate is lower than 20 ppm.

The invention provides an aluminum-vanadium-niobium-chromium intermediate alloy as well as a preparation method and application thereof. The aluminum-vanadium-niobium-chromium intermediate alloy comprises the following components in percentage by mass: 15%-22% of V, 1%-7% of Nb, 5%-11% of Cr and the balance of Al and inevitable impurities. The preparation method of the aluminum-vanadium-niobium-chromium intermediate alloy comprises the following steps: firstly, respectively preparing three binary intermediate alloys, namely primary alloys, by utilizing an aluminothermic reduction method; then, the primary alloy is refined through vacuum induction melting, and a secondary alloy is obtained; and finally, the secondary alloy and metal aluminum are subjected to vacuum induction melting, and the aluminum-vanadium-niobium-chromium intermediate alloy is prepared. The aluminum-vanadium-niobium-chromium intermediate alloy has the advantages of being uniform in component, low in element segregation and low in impurity content, and has very good application prospects and large-scale industrial popularization potential in the field of titanium alloy production through the additive manufacturing technology.

The invention discloses a biogas purification and heat supply method for boiler combustion, and relates to the technical field of biogas heat supply, the method comprises the following specific steps: biogas collection and primary treatment: collecting biogas from a biogas generation source, enabling the biogas to pass through a primary filter device with a filter screen with specific mesh number, removing dust and solid residue impurities, and performing secondary treatment; by introducing the magnetic field to assist the purification process, the purification efficiency of the biogas can be remarkably improved, magnetic impurity particles in the biogas can directionally move and gather under the action of the magnetic field, so that the magnetic impurity particles are more easily removed by a physical separation means, and meanwhile, the magnetic field can promote the activity and reaction rate of substances participating in the purification reaction, so that the purification efficiency is improved. By means of the magnetic field, decomposition and conversion of impurities are effectively accelerated, the biogas is more thoroughly purified, the quality of the biogas subjected to auxiliary purification of the magnetic field is remarkably improved, the impurity content is greatly reduced, the biogas can be more sufficiently combusted in the follow-up combustion heat supply link, more heat is released, and the combustion efficiency is improved.

The invention discloses a method for preparing silicon carbide from a silicon waste material and a waste lithium ion battery graphite anode. The method specifically comprises the following steps: (1) respectively carrying out ball milling and mixing on the diamond wire cutting silicon waste material and the crushed and screened waste lithium ion battery graphite anode; (2) high-temperature smelting, ball milling and roasting; and (3) placing in an acid, stirring, leaching, centrifuging, washing, drying and ball-milling to obtain the high-efficiency leaching agent. According to the method, the diamond wire cutting silicon waste and the waste lithium ion battery graphite anode are used as preparation raw materials, silicon carbide is prepared and purified through the processes of ball milling, material mixing, smelting, roasting, acid leaching, centrifuging, drying and the like, and finally high-purity nanoscale silicon carbide particles are obtained. The recycling of the diamond wire cutting silicon waste and the graphite anode of the waste lithium ion battery not only can reduce resource waste and environmental pollution and improve the utilization rate of the waste, but also can generate considerable economic benefits.

The invention relates to the technical field of gas primary coolers, in particular to an anti-blocking gas primary cooler. The device is of a vertical structure, comprises a coal gas washing section, a low-temperature water section, a circulating water section and a coal gas equalizing section which are fixedly connected in sequence from bottom to top, and further comprises an ammonia water tank connected with a coal gas washing section pipeline, the coal gas washing section is provided with an ammonia water spraying pipe, and coal gas is washed by ammonia water; the coal gas washing section is connected with the coal gas equalizing section through a coal gas connecting pipeline, and washed coal gas without impurities enters the coal gas equalizing section through a pipeline; the coal gas is provided with a horizontal main pipe and a plurality of branch pipes symmetrically arranged on the two sides of the main pipe in a segmented mode, and the coal gas evenly enters the primary cooler through the branch pipes. The impurity content in the gas is reduced and the gas primary cooler is prevented from being blocked.

The invention provides a process for preparing a high-purity human blood coagulation factor IX from plasma. The process comprises the following steps: acquiring plasma; adding anion gel, adsorbing, and collecting an eluted protein solution; adding heparin sodium, filtering, ultra-filtering and dialyzing to obtain dialyzed protein liquid; adding an S / D solution; adding anion gel for secondary adsorption, and collecting eluted protein liquid II; performing filtration, ultrafiltration and dialysis, and collecting eluted protein liquid after dialysis; filtering is performed; carrying out affinity gel chromatography purification, collecting eluent, and carrying out ultrafiltration and dialysis; filtering, and adding a dialysate containing glycine for dialysis to obtain a human blood coagulation factor IX stock solution; adjusting the titer, and adding heparin sodium to obtain a diluted solution; pre-filtering the diluted liquid to obtain a semi-finished product of the human blood coagulation factor IX; sterilizing, filtering, sub-packaging, carrying out vacuum freeze drying, carrying out dry heat virus inactivation, inspecting and packaging. According to the invention, the production process is simplified, the cost is reduced, the activity of the finally obtained human blood coagulation factor IX is greater than 50IU / ml, and the specific activity is higher than 180IU / mg.

The invention relates to the field of medicines, and provides a tevirimat composition as well as a preparation method and application thereof. The composition contains tevirimat serving as an active component, cyclodextrin serving as an inclusion agent, meglumine serving as a solubilizer and an alkaline additive in a weight ratio of 1: (15-30): (0.05-0.2): (0.1-0.2). Wherein the solubility of the active ingredient tevirimat can be greatly improved through the matching and combined use of the three auxiliary materials including the inclusion agent, the solubilizer and the alkaline additive. Compared with the prior art, the dosage of each auxiliary material in the composition can meet the specified limit in related laws and regulations, the allergy risk, the hemolysis risk and the stimulation risk are low, and the preparation safety is better. The composition provided by the invention is simple and feasible in preparation method, more stable in preparation finished product quality and more convenient to apply. The composition can be used for treating or preventing virus infection and related diseases caused by orthopoxvirus.

The invention discloses an extraction purification deep impurity removal method for a nickel sulfate solution, and belongs to the technical field of nickel sulfate solution purification, and the extraction purification deep impurity removal method comprises the following steps: carrying out saponification treatment on a P204 extraction agent by adopting a sodium hydroxide solution to obtain a saponified organic phase P204, mixing the saponified organic phase P204 with a nickel sulfate water phase, stirring and standing to obtain a nickel sulfate solution; the method comprises the following steps: separating an organic phase from a water phase, mixing the organic phase with sulfuric acid, stirring, standing, separating out a nickel sulfate solution, concentrating the nickel sulfate, and recrystallizing to obtain the high-purity nickel sulfate with the purity of 99.4-99.9%. According to the method, the battery-grade nickel sulfate product with the purity as high as 99.9% can be obtained, the requirement of HG / T2824-2009 first-grade products is met, and the method is particularly suitable for purification of crude nickel sulfate generated in the copper ore smelting process and preparation of the battery-grade nickel sulfate.

The invention provides a preparation process and application of rock sugar syrup, and belongs to the technical field of food production and processing. The purified high fructose corn syrup, purified mogroside and other high-purity components are used, the impurity content in the rock candy syrup raw materials is reduced, modified activated carbon is matched for adsorption treatment, the ash content of the rock candy syrup is reduced through the comprehensive effect, and meanwhile the light transmittance of the syrup is improved.

The invention provides benzoyl peroxide gel and a preparation method thereof. The preparation method comprises the following steps: S1, preparing an active phase; s2, preparing a gel phase; s3, mixing half of the active phase with the gel phase, and performing constant-temperature water bath to obtain low-crosslinking-degree gel; s4, uniformly granulating the low-crosslinking-degree gel, mixing the low-crosslinking-degree gel with the balance of the active phase, and performing vacuum negative-pressure stirring twice to obtain a material; and S5, adding a pH regulator into the material, regulating the pH value, discharging and filling. Nanocrystals are formed through benzoyl peroxide pretreatment, the surface area and activity are improved, the curative effect is enhanced on the premise of safety, uniform dispersion can be achieved, the stability of benzoyl peroxide in gel is improved, and the storage time is prolonged. A part of the active phase and the gel phase are mixed to form low-crosslinking-degree gel, the low-crosslinking-degree gel is uniformly granulated and then mixed with the remaining active phase, and the benzoyl peroxide gel is prepared through vacuum negative pressure, so that the swelling property can be improved, the stability and the permeability can be improved, and adverse reactions such as irritation to skin can be avoided.

The invention discloses duplex stainless steel containing rare earth elements and a preparation process of the duplex stainless steel. The duplex stainless steel comprises the following components in percentage by weight: less than 0.04% of C, 0.2-0.8% of Si, 0.8-1.5% of Mn, less than or equal to 0.005% of S, less than or equal to 0.02% of P, 22.0-27.0% of Cr, 5.0-7.0% of Ni, 3.0-4.0% of Mo, 0.24-0.32% of N, 0.002-0.005% of B, 0.05-0.10% of mischmetal and the balance of iron and other inevitable impurities. The preparation method comprises the steps of metal smelting; adding alloy for refining; mixed rare earth with the oxygen content smaller than 1000 ppm is added in batches; pouring under the protection of argon; rolling is conducted; and carrying out solution treatment. The method has the characteristics that the purity, the corrosion resistance, the hot working performance and the yield of the duplex stainless steel are improved.

The invention belongs to the field of preparation of high-purity quartz, and relates to a method for directionally removing impurity elements of pegmatite type high-purity quartz, which comprises the following steps: (1) crushing raw materials by a crusher, washing ore, grinding and grading, reselecting and floating to obtain quartz concentrate; (2) adding the quartz sand into the leachate A for constant-temperature micro-pressure leaching, and washing to obtain primary quartz sand; the leachate A is mixed acid of HF, HCl and HNO3, the concentration ratio of the HCl to the HNO3 is (3-12): 1, the concentration ratio of the HCl + HNO3 to the HF is smaller than or equal to 3, and the sum of the concentrations of the HCl, the HCl and the HNO3 is larger than or equal to 3 mol / L; (3) roasting and water quenching to obtain intermediate quartz sand; (4) adding the quartz sand into the leachate B for ultrasonic leaching, washing, and carrying out high-temperature heat treatment to obtain high-purity quartz sand; the leachate B is a mixed acid of HF and HCl, HF is 0.5-2 mol / L, and the concentration ratio of HCl to HF is less than or equal to 3. According to the method, the 4N8-grade high-purity quartz sand can be obtained, the yield is high, the process is simple, and operation is easy.

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.

The application provides a preparation method of a diphenylfluorene polyether. The method uses diphenylfluorene as a substrate, butylene oxide as an epoxide monomer, toluene as an organic solvent, and under the action of a composite catalyst, reacts at 110-200 DEG C for 2-6 hours to obtain the diphenylfluorene polyether. The composite catalyst is obtained by reacting a porous aromatic skeleton with a bromoalkyl quaternary ammonium salt to obtain a quaternary ammonium salt functionalized porous aromatic skeleton, and finally, a basic catalyst is limitedly encapsulated in the pore channel of the quaternary ammonium salt functionalized porous aromatic skeleton by electrostatic attraction. The catalyst of the method can be recycled and reused, and the yield retention rate is greater than or equal to 92% after the composite catalyst is used for 5 cycles, and the method is suitable for optical display, high-frequency circuit board, semiconductor packaging and other fields.

The utility model relates to the technical field of unmanned aerial vehicle pesticide spraying, and discloses an unmanned aerial vehicle-based pest control device which comprises a supporting frame, a placement plate is fixedly connected to the interior of the supporting frame, a pesticide box is fixedly connected to the upper end of the placement plate, and a liquid pumping pipe is fixedly connected to one side of the pesticide box; one end of the liquid pumping pipe extends into the medicine box and extends to the bottom of the medicine box. According to the pest control device based on the unmanned aerial vehicle, two connecting plates distributed in a mirror image mode are fixedly connected to a cover plate, the lower ends of the connecting plates extend into a filter box and are fixedly connected with a filter screen, the filter screen filters impurities and particulate matter in pesticide liquid, the content of the impurities in the sprayed pesticide liquid is reduced, and through the filtering effect of the filter screen, the pesticide liquid can be sprayed out conveniently. The cover plate is arranged on the filter box, the nozzle can be effectively prevented from being blocked, meanwhile, the sealing ring is arranged between the cover plate and the filter box, a relatively closed space is formed in the filter box through the design, liquid medicine can be effectively prevented from flowing out of a gap between the cover plate and the filter box, and therefore the filter effect is improved.

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.

The invention relates to a core of an aluminum electrolytic capacitor and the aluminum electrolytic capacitor comprising the core, and relates to the technical field of capacitors. The core of the aluminum electrolytic capacitor is composed of an assembly comprising a positive electrode foil, a negative electrode foil, electrolytic paper and a foil guide strip, the positive electrode foil is an aluminum foil with the purity of 99.99% or above, and the negative electrode foil is an aluminum foil with the purity of 99.5% or above. The aluminum electrolytic capacitor provided by the invention comprises the core provided by the invention. The aluminum electrolytic capacitor disclosed by the invention not only can stably work under a rated working voltage for a long time, but also can continuously and stably work under an overvoltage working condition within a short time, and has a good industrial application prospect.

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.

The invention discloses a method for preparing TiAl alloy powder through molten salt assisted metal thermal reduction. The method comprises the steps that anhydrous AlCl3 powder and KCl powder are prepared into AlCl3amp; and then mixing a reducing agent and TiO2, and carrying out magnesiothermic reduction reaction at high temperature to prepare the TiAl alloy powder. The preparation method comprises the following steps: preparing AlCl3amp; the TiAl alloy is prepared through magnesium thermal reduction assisted by KCl molten salt, and AlCl3amp is used; according to the preparation method, TiO2 is taken as a raw material, KCl molten salt is taken as a reaction medium, the mass transfer efficiency of TiO2 in the low-temperature reduction process is improved, reduction of TiO2 and combination of TiAl alloy are completed, the process of preparing the TiAl alloy from TiO2 reduction through a one-step method is achieved, the preparation method of the TiAl intermediate alloy powder is low in energy consumption, short in process and mature in technology, and the problems that an existing TiAl alloy powder preparation process is complex and high in energy consumption are solved.

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.

The application discloses a kind of two-dimensional organic material based on porphyrin unit and its preparation method and application, the two-dimensional organic material is formed by the supramolecular interaction of protonated 5,10,15,20-tetra (4-aminophenyl) porphyrin and pyromellitic acid self-assembly.It does not need to add surfactant in its preparation process, only by reducing the precursor concentration and appropriately increasing the pH value of pure water phase regulation, by low concentration limited self-assembly, directly obtain the dispersion stable two-dimensional ultrathin nanosheet.The material takes porphyrin unit as light active center and specific adsorption site, in the complex composition of electronic waste leaching solution, without additional electron sacrificial agent, by material itself consumption photogenerated hole, under visible light driving, complete the selective enrichment and in-situ reduction of tetrachloroaurate anion, generate elemental gold.The application process is simple and environmental protection, with good application prospect.

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.

The invention belongs to the field of preparation of medical materials, and particularly relates to a preparation method of medical-grade high-purity lithium carbonate, which comprises the following steps: carrying out replacement reaction on metal lithium and deionized water to prepare a lithium hydroxide solution; introducing carbon dioxide gas into the lithium hydroxide solution, carrying out carbonization treatment, controlling the pH at the end point of the carbonization reaction to be 8-10.5, and then carrying out solid-liquid separation treatment to obtain a lithium bicarbonate solution; carrying out heat preservation treatment on the lithium bicarbonate solution at the temperature T and the pressure P, and separating to obtain pharmaceutical-grade high-purity lithium carbonate; the temperature T ranges from 90 DEG C to 98 DEG C, and the P ranges from 0.01 Mpa to 0.09 Mpa. According to the method, lithium carbonate is synthesized by utilizing a reaction mechanism of replacement-carbonization and thermal insulation transformation treatment, and on the basis, the combination of the pH value of carbonization and the temperature T and pressure P of thermal insulation treatment is further matched, so that the nucleation behavior of lithium carbonate can be accidentally controlled, the nucleation wrapping of impurities is reduced, and the purity of lithium carbonate is improved. Therefore, lithium carbonate which meets medical application requirements and has excellent particle size uniformity can be prepared with high direct yield based on a simple means.

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.