59 results about "Strontium chloride" patented technology

The present invention belongs to the technical field of glass preparation, and specifically relates to an ultra-white glass and a preparation method thereof. The ultra-white glass of the present invention is composed of the following raw materials by weight: 110 parts of quartz sand, 18-20 parts of sodium carbonate, 14-16 parts of colemanite, 4.5-5.5 parts of magnesia, 2.6-2.8 parts of calcined alumina, 1.1-1.3 parts of potassium oxide, 0.8-1.0 parts of zinc oxide, 1.5-1.7 parts of phosphorus pentoxide, 0.15-0.20 parts of strontium chloride, 0.3-0.34 parts of calcium fluoride, 0.25-0.27 parts of barium nitrate, and 0.16-0.18 parts of zirconium oxide. The ultra-white glass of the present invention has a synergistic effect between the raw materials to ensure that the prepared ultra-white glass has excellent whiteness and visible light transmittance.

The invention discloses an oral care desensitization paste and a preparation method thereof, and mainly relates to the technical field of dental medicines. The oral care desensitization cream is prepared from the following components: bioactive glass, strontium chloride, sodium chloride, silicon dioxide, sodium carboxymethyl cellulose, polyethylene glycol 400, a xanthan gum solution, sodium lauryl sulfate, sodium lauroyl sarcosinate, titanium dioxide, beta-glucan, saccharin sodium salt, sorbitol, methylparaben, propyl hydroxybenzoate, edible essence and water. Compared with the prior art, the oral care desensitization paste disclosed by the invention can be used for sealing dentinal tubules and treating hemodia; the traditional Chinese medicine composition can also be used for treating plaque gingivitis, relieving and reducing gingival bleeding and inhibiting and reducing dental plaque; and meanwhile, the condition of mistakenly swallowing and eating in the using process is reduced.

The invention provides a synthesis method of a bromide ion adsorbent for salt lake bromine extraction, and belongs to the technical field of adsorbent preparation, a mixed solution of strontium chloride and manganese chloride and a mixed solution of sodium phosphate and sodium hydroxide are subjected to precipitation reaction to obtain A-Sr4Mn6 (PO4) 6 (OH) 2; the preparation method comprises the following steps: reacting A-Sr4Mn6 (PO4) 6 (OH) 2 with a sodium bromide solution to obtain B-Sr4Mn6 (PO4) 6Br2; and reacting the B-Sr4Mn6 (PO4) 6Br2 with a sodium hydroxide solution to obtain Sr4Mn6 (PO4) 6 (OH) 2, namely the bromide ion adsorbent. The prepared adsorbent can selectively adsorb bromide ions from high-salt brine, and has the advantages of high adsorption capacity, high selectivity, high recyclability and the like; in brine with extremely high chloride ion concentration, low-concentration bromide ions can be selectively adsorbed without being influenced by high-concentration chloride ions; in a high-salt water body, the adsorption capacity on bromide ions is higher; the selective adsorption separation of the chloride ions and the bromide ions is realized.

The invention belongs to the technical field of metal surface chemical treatment, and particularly relates to a metal surface wear-resistant and corrosion-resistant treatment method and application thereof. The wear-resistant and corrosion-resistant treatment method for the metal surface comprises the following steps: carrying out oil and grease removal pretreatment on the metal surface; preparing a solid catalytic high-pressure nitriding agent; and the metal is placed in a closed vacuum environment, and a solid catalytic high-pressure nitriding agent is injected for nitriding treatment. According to the invention, an in-situ solid-phase reaction is adopted, and the solid catalytic high-pressure nitriding agent with high activity is prepared through the aperture confinement effect of an alumina molecular sieve carrier; sodium chloride is used as a permeating agent dispersing agent, has a space confinement effect, prevents the generated nano oxide to promote the growth of the permeating agent and can keep high catalytic activity, and solid octa-amminestrontium chloride is used as an ammonia-rich nitrogen source, so that the gas generation amount is large at low temperature; the alumina molecular sieve carrier and sodium chloride can be repeatedly used, and cost is reduced. The nitriding agent is applied to wear-resistant and corrosion-resistant treatment of the inner cavity surface of a sea water pump, and the nitriding rate is increased by 50% or above under high-pressure low-temperature nitriding.

This invention discloses a product pretreatment auxiliary device based on strontium chloride refrigerant, comprising: a preparation tank with a collection tray sealed at its bottom; a grinding sieve casing, which is conical in shape and is fixedly connected to the preparation tank, dividing the tank cavity into an upper processing chamber and a lower collection chamber; a pushing and stirring assembly, which is rotatably mounted on the top of the preparation tank and pressed against the outer surface of the grinding sieve casing, and is driven to rotate by a first transmission assembly, wherein the pushing and stirring assembly has a rotating shaft inside, which is driven by a second transmission assembly, and a scraping assembly is mounted at the bottom of the rotating shaft and pressed against the inner surface of the grinding sieve casing; and a first heating assembly, which extends through the rotating shaft into the scraping assembly.

The invention discloses a strontium chloride-assisted method for improving the fluorescence quantum yield of manganese-doped CsPbCl3 quantum dots, which comprises the following steps: adding cesium carbonate into octadecene, heating and stirring until uniform mixing, and injecting oleic acid to obtain a cesium oleate solution; the preparation method comprises the following steps: adding different amounts of strontium chloride auxiliary dopant, manganese chloride dopant, lead chloride, oleylamine and oleic acid into octadecene, heating and stirring to uniformly mix to obtain a precursor mixed solution; injecting the cesium oleate solution into the precursor mixed solution, reacting for a certain period of time, and cooling in ice water to room temperature to form a CsPbCl3 quantum dot stock solution; a certain proportion of a flocculating agent is added into the stock solution, and a CsPbCl3 quantum dot solution is obtained through centrifugal treatment. According to the preparation method disclosed by the invention, the quantum yield of Mn-emitted fluorescence of the Mn-doped CsPbCl3 quantum dot is improved by regulating and controlling the addition amount of the doping agent, and finally, the quantum yield of Mn-emitted fluorescence of the Sr and Mn co-doped CsPbCl3 quantum dot reaches up to 100%.

The invention relates to an ethylene glycol regulated rare earth europium doped Sr2LaF7 nano material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, dissolving strontium chloride, lanthanum nitrate and europium nitrate in water to form a uniform solution; then adding ethylene glycol accounting for 20-70% of the volume of the deionized water, and regulating crystal growth by utilizing coordination of the ethylene glycol and metal ions; adding an ammonium fluoride or sodium fluoride solution, adjusting the pH value, and carrying out a hydrothermal reaction at 100-180 DEG C for 4-12 h; and finally, centrifuging, washing and drying to obtain a final product. Compared with the prior art, the morphology-controllable preparation of the Sr2LaF7 nano material is realized through directional regulation and control of ethylene glycol and a simple hydrothermal method, and the product has the advantages of high luminous intensity, uniform morphology and the like, and has an application prospect in the fields of fluorescence labeling and the like; the method is simple in process and low in cost.

The invention provides an anti-sensitivity cleaning toothpaste and a preparation method thereof, wherein the toothpaste comprises the following raw materials in parts by weight: 20-25 parts of hydroxyapatite, 2-6 parts of sodium guaiacyl sulfonate, 2-5 parts of a first plant extract, 1-3 parts of a second plant extract, 5-10 parts of borneol, 4-9 parts of strontium chloride hexahydrate, 10-15 parts of silicon dioxide, 1-3 parts of a thickener, 2-5 parts of a moisturizer, 1-3 parts of a foaming agent and 30-35 parts of deionized water. The toothpaste of the invention has good anti-sensitivity and anti-inflammatory effects and high storage stability, and is an anti-sensitivity toothpaste specifically used for people who use bleaching agents to bleach their teeth.

The application discloses a kind of multistage filtering devices for strontium chloride purification, comprising: base, left side fixed with support on it, right side circumferentially arranged with support seat;Filter cartridge, installed on the support;Ring seat, configured as two groups, respectively fixedly sleeved in the middle and upper part of the support seat;Purification cylinder, fixed on the ring seat, and its inside is equipped with purification mechanism;Cover, set at the top end position of the purification cylinder, and connected with the purification mechanism;And connecting pipe, communicated between the filter cartridge and the purification cylinder, and the interface between the purification cylinder is telescopic structure.

The invention provides a method for solidifying radioactive nuclear waste, and the method comprises the following steps: S1, uniformly mixing radioactive waste and dihydric phosphate to obtain a solid mixture, and then adding water into the solid mixture to obtain a raw material mixture, the radioactive waste comprising strontium chloride; s2, the raw material mixture is subjected to a supercritical hydrothermal reaction, a ceramic solidified body is obtained, and the supercritical hydrothermal reaction conditions include that the reaction temperature ranges from 390 DEG C to 400 DEG C, the pressure in a kettle ranges from 25 MPa to 27 MPa, the heat preservation time ranges from 9 min to 11 min, and the stirring rotating speed ranges from 400 rpm to 600 rpm. The method is easy to operate, good in curing effect and low in radionuclide leaching rate.

The invention relates to the technical field of metal halide luminescent materials, and discloses a preparation method of a cesium-lead-bromine-chlorine blue-light quantum dot colloid and a preparation method of a blue-light film. The method comprises the following steps: dissolving cesium bromide and lead bromide in N, N-dimethylformamide, adding oleic acid and oleylamine to form a precursor solution, and injecting the precursor solution into a toluene anti-solvent to prepare CsPbBr3 quantum dot colloid; and then dropwise adding a toluene saturated solution of alkaline earth metal chloride (calcium chloride, strontium chloride, barium chloride or magnesium chloride) for post-treatment to realize ion exchange of Cl <-> and Br <-> and synergistic defect passivation, so that the emission peak is continuously adjustable in the range of 450-500 nm, the half-peak width is less than 30 nm, and the photoluminescence quantum yield is greater than 60%. And further mixing the quantum dot colloid with a polymethyl methacrylate toluene solution and forming a film to obtain a stable blue light quantum dot film which can be used for a backlight source or a display device.

The application belongs to the technical field of material science and engineering, and discloses a preparation method of manganese and bismuth co-doped barium strontium titanate ceramic material with high dielectric property. The application adopts a liquid phase method to react titanium tetrachloride, barium chloride, strontium chloride, oxalic acid, manganese oxide and bismuth oxide to obtain uniform barium strontium titanate powder. Co-doping is selected in the aspect of doping, and the manganese and bismuth co-doped barium strontium titanate is the first case. The preparation method highlights that the particle size of the prepared barium strontium titanate powder is smaller and uniform without agglomeration, and the barium strontium titanate powder has the characteristics of high dielectric constant and low dielectric loss.

The invention discloses a mouthwash for preventing oral cancerization. The mouthwash is prepared from the following raw material components: 8-13 parts of normal saline, 1-3 parts of a rotting agent, 1-2 parts of a sweetening agent, 1-3 parts of an ethanol humectant, 0.1-0.5 part of a surfactant, 0.2-0.6 part of a coloring agent, 0.5-2 parts of a preservative, 1-3 parts of food-grade sodium fluoride, 0.1-0.5 part of food-grade strontium chloride and 75-90 parts of refined water. Sodium fluoride has the effects of increasing density and sterilizing. The protection effect on the tooth glaze can be achieved. The toothpaste has the same effect on oral bacteria fluorine-containing toothpaste. Strontium chloride has the effects of cleaning tooth stains and relieving pains caused by tooth sensitivity. The use method of the mouthwash is simple, and after betel nuts are chewed, the mouthwash is used for cleaning the oral cavity, so that the effect of preventing oral canceration is achieved.

The application discloses a kind of polystrontium aspartate / potassium and its preparation method and application, belong to daily chemical technical field.The polystrontium aspartate / potassium using poly succinimide can be prepared in the aqueous solution of strontium hydroxide and potassium hydroxide hydrolysis.The preparation process has the characteristics of mild conditions, simple process, low cost, high efficiency and environmental protection.The polystrontium aspartate / potassium provided by the application is used for whitening and anti-allergic toothpaste, has the dual effect of moisturizing and whitening and anti-allergic, compared with adding poly sodium aspartate and potassium chloride, strontium chloride respectively, the use of polystrontium aspartate / potassium eliminates a large number of sodium ions and chloride ions, effectively reduces the ion concentration in formula, reduces formula difficulty.

The invention discloses a high photoelectric conversion rate perovskite cell and a preparation method thereof. The structure of the perovskite cell is sequentially composed of an FTO conductive glass layer, an electron transport layer, a perovskite light absorption layer, a strontium chloride film layer, a hole transport layer and a gold electrode layer; the material of the electron transport layer is titanium dioxide or tin dioxide. The high photoelectric conversion rate perovskite cell of the invention prepares a layer of strontium salt film modification layer on the surface of the perovskite light absorption layer as an interface modification layer to form a barrier layer for ion migration. The addition of the strontium salt film modification layer significantly improves the photoelectric performance of the perovskite solar cell, so that the photoelectric conversion efficiency of the perovskite cell can reach 21.11%. The stability of the perovskite cell of the invention is significantly improved, which is helpful to promote the commercialization of the perovskite cell.

The invention relates to a zero-carbon sulfur-free magnesium repair material based on crystal water flow promotion, and belongs to the technical field of refractory materials for steel converter thermal repair. The product is prepared from the following raw materials in parts by weight: magnesia, magnesium chloride hexahydrate, strontium chloride hexahydrate, hydromagnesite and silicon dioxide micro powder which are mixed to form a basic repairing material. According to the zero-carbon sulfur-free magnesium repairing material based on crystal water flow promotion and the sintering performance regulation and control method thereof, the repairing material reacts rapidly after being heated to release a large amount of crystal water, and the repairing material, SiO2 micro-powder particles and light-burned MgO particles generated through in-situ decomposition of hydromagnesite in a system form a sol product rapidly; according to the repairing material, aggregate and a matrix in the repairing material can be effectively bonded, the preliminary bonding effect is exerted, the medium-low temperature strength of a repairing material layer is improved, meanwhile, the pushing and flow promoting effect of the slurry on the aggregate can be accelerated, and after water evaporation and sintering reaction are completed, a firm repairing material sintering layer can be formed in a to-be-repaired area of a furnace lining; therefore, the purpose of rapid fettling is achieved.

The invention relates to a phase-change material for a building as well as a preparation method and application of the phase-change material. The phase-change material for the building comprises the following components in parts by weight: 600-800 parts of a cooked phase-change material, 20-30 parts of a nucleating agent and 1-5 parts of a temperature regulator, wherein the cooked phase change material is a mixture of anhydrous calcium chloride, sodium carbonate decahydrate and disodium hydrogen phosphate dodecahydrate; the nucleating agent is a mixture of strontium chloride hexahydrate, polyethylene glycol and carboxymethyl cellulose, and the temperature regulator is urea. According to the application, the phase-change material for the building is used for preparing a phase-change composite vacuum insulation panel, the material is large in phase-change latent heat and high in cycling stability, the phase-change material serves as the hydrated salt phase-change material for the building, the problem that the unit volume / mass enthalpy value of phase-change microcapsules used for traditional buildings is low is solved, and the phase-change material has the advantages of being appropriate in phase-change temperature, high in cycling stability and the like. The material is used for preparing the vacuum insulated panel, and the heat insulation effect is good.

The utility model discloses anhydrous strontium chloride discharging equipment, including the feed frame, the inner wall fixedly connected with filter screen of feed frame, the upper side of filter screen is equipped with the plugging mouth, the inner wall fixedly connected with baffle of plugging mouth, the lower side fixedly connected with drive motor of feed frame. The utility model discloses, be provided with drive motor, cleaning frame, can realize the rotation of cleaning frame with the help of drive motor, and cleaning frame can scrape the outside of filter screen and carry out the operation of removing, in the process of rotating, through the cooperation of stressed member, annular groove, trapezoidal ring groove and sealing block etc. parts, can automatically realize the opening and sealing of one side of cleaning frame, complete the efficient cleaning of impurity, and the inside of cleaning frame, linkage mouth and feed frame form the separation state between, make the time of cleaning impurity and normal processing time can coincide, the length of time of equipment shutdown because of cleaning is greatly shortened, effectively promoted the overall production efficiency.

The present invention belongs to the technical field of glass preparation, and specifically relates to an ultra-white glass and a preparation method thereof. The ultra-white glass of the present invention is composed of the following raw materials by weight: 110 parts of quartz sand, 18-20 parts of sodium carbonate, 14-16 parts of colemanite, 4.5-5.5 parts of magnesia, 2.6-2.8 parts of calcined alumina, 1.1-1.3 parts of potassium oxide, 0.8-1.0 parts of zinc oxide, 1.5-1.7 parts of phosphorus pentoxide, 0.15-0.20 parts of strontium chloride, 0.3-0.34 parts of calcium fluoride, 0.25-0.27 parts of barium nitrate, and 0.16-0.18 parts of zirconium oxide. The ultra-white glass of the present invention has a synergistic effect between the raw materials to ensure that the prepared ultra-white glass has excellent whiteness and visible light transmittance.

The utility model relates to the field of magnetic material equipment, and discloses a device for concentrating and recovering strontium chloride in waste water, which comprises a heat exchange kiln, which comprises a kiln body which is transversely arranged and can rotate, a feed port and a discharge port are respectively arranged at two ends of the kiln body, a spiral guide plate is arranged inside the kiln body, and a sectional type water cooling component is wound outside the kiln body; two interfaces of the steam generator are respectively communicated with the water inlet and the water outlet of the sectional type water cooling component; the triple heat exchange concentration device is communicated with the steam generator. According to the device, the strontium chloride in the bonded permanent magnetic ferrite production wastewater can be concentrated and recovered, and the obtained strontium chloride recovery solution can be repeatedly used for preparing the bonded permanent magnetic ferrite, so that the utilization rate of strontium resources can be remarkably improved, the waste of the strontium resources is effectively reduced, and the cost is greatly reduced. On the basis, steam used for concentrating and recycling strontium chloride also comes from the production process of the bonded permanent magnetic ferrite, and full utilization of heat energy can be realized.

The invention discloses a device and a method for preparing high-purity strontium chloride for oral care, and relates to the technical field of strontium chloride preparation. The inner bin body is fixed in the outer bin body; the fixed disc is fixed on the upper end surface of the inner bin body; the atomization assembly is fixed to the axis position of the fixing disc; the hose inlet is formed in the outer bin body and communicates with the atomization assembly; one end of the discharging opening is fixed to the lower end face of the inner bin body, the other end of the discharging opening is connected with a conveying opening, and the conveying opening adopts vacuum conveying; the heating assembly is fixed to the outer bin body and the inner bin body and comprises a blocking opening, a first heating opening, a retention bin and a second heating opening.

The invention discloses a method for determining lithium in a lithium ore bioleaching solution, and belongs to the technical field of biological metallurgy, the determination method comprises the following steps: preparing a lanthanum nitrate-strontium chloride composite matrix improver, sampling from the lithium ore bioleaching system leaching solution, centrifuging to remove solid impurities, filtering the solid impurities by using a 0.22 [mu] m filter membrane, and collecting the lithium in the lithium ore bioleaching system leaching solution; a sample is diluted for standby application, a lanthanum nitrate-strontium chloride composite matrix improver is added into the sample, the concentration ratio of lanthanum nitrate to strontium chloride in the lanthanum nitrate-strontium chloride composite matrix improver is 1: 2, and the sample is measured by adopting a flame atomic absorption spectrophotometer. The method is especially suitable for bioleaching solution analysis of lithium ore and efficient detection of lithium resources, the inhibition effect of coexisting ions on lithium atomization is avoided through the lanthanum nitrate-strontium chloride composite matrix improver, and the coexisting interfering ions are competitively complexed, background absorption is reduced, and a lithium signal is prevented from being covered, so that the determination accuracy is improved.

The invention provides a preparation method of fibrous mordenite. The preparation method comprises the following steps: (1) mixing alkaline silica sol, sodium hydroxide, sodium metaaluminate, strontium chloride hexahydrate and deionized water according to a certain proportion; (2) stirring until the materials are uniformly mixed, putting the mixture into a high-pressure reaction kettle, and crystallizing at the crystallization temperature of 150-200 DEG C for 24-120 hours; and (3) after the reaction, taking out, cooling, carrying out suction filtration, and drying to obtain the fibrous mordenite. The morphology of the mordenite can be controlled by adding strontium chloride, and the obtained zeolite is high in crystallinity and can be used for large-scale production. The growth of mordenite in the b-axis direction is controlled, the grain width is controlled to be 20-100 nanometers, and the micron-size length is kept in the c-axis direction. The mordenite obtained by the method is not only beneficial to the application of the mordenite in catalysis and adsorption, but also beneficial to the operation advantages of the mordenite in the preparation processes of separation, filtration and the like, so that the mordenite has very good application potential.

The invention provides a trace element formula suitable for industrial recirculating aquaculture of penaeus vannamei under an artificial seawater condition and a use method of the trace element formula, and relates to the field of industrial recirculating aquaculture. The trace element formula comprises potassium bromide, boric acid, strontium chloride, sodium silicate, zinc sulfate, ferrous sulfate, copper sulfate, manganese chloride, sodium selenite, ammonium molybdate, calcium gluconate and lysine, and the trace elements are added into a common feed to feed penaeus vannamei boone. The defects in the prior art are overcome, the growth efficiency of the penaeus vannamei boone is effectively improved by supplementing related trace elements in the feed, and the economic benefits of culture are increased.

The invention discloses a calculation design method of a Na-doped SrCl2-based solid electrolyte, and mainly solves the problem of low chloride ion conductivity of a strontium chloride (SrCl2)-based chloride ion solid electrolyte material under the condition of room temperature (300K) at present. According to the method, firstly, a Na-doped SrCl2 compound (Na < x > Sr < 1-x > Cl2-x) is subjected to structure optimization and screening by adopting a first principle method, the formation of the Na-doped SrCl2 compound is calculated, the optimal growth conditions of the Na-doped SrCl2 compound are found, and x is 0.03125, 0.0625, 0.09375, 0.125 and 0.15625 respectively; on the basis, the chloride ion conductivity of Na < x > Sr < 1-x > Cl < 2-x > is calculated by adopting a de novo molecular dynamics method, and the calculation result shows that Na < 0.0625 > Sr < 0.937 > Cl < 1.9375 > has the highest chloride ion conductivity at the temperature of 300 K, and the value of the highest chloride ion conductivity is 3.32 * 10 <-3 > S.cm <-1 >. In addition, Na < 0.0625 > Sr < 0.937 > Cl < 1.9375 > has good electronic insulativity, a relatively wide electrochemical stability window and good mechanical properties. The invention provides a new thought and method for researching and developing the chloride ion battery solid electrolyte with high chloride ion conductivity.

The invention relates to a method for manufacturing a glass article. Provided is a method for manufacturing a glass article capable of reducing the energy required for manufacturing the glass article. A method for producing a glass article, which is a method for producing molten glass using a glass raw material, and which comprises: heating and melting the glass raw material in a furnace to produce the molten glass; the method is characterized in that a dehydrated raw material is obtained by dehydrating a water-containing raw material under at least one of the following condition 1 and the following condition 2 using at least one of waste heat generated in a melting furnace and waste heat generated in a molding unit connected to the melting furnace and molding the molten glass, and the dehydrated raw material is added to the glass raw material. Condition 1: the water-containing raw material is boric acid, and the temperature of the water-containing raw material during dehydration is 170 DEG C or less. Condition 2: The water-containing raw material is one or more chloride raw materials selected from the group consisting of strontium chloride, calcium chloride, and magnesium chloride, and the temperature of the water-containing raw material during dehydration is 250 DEG C or less.

The invention discloses a phase-change material for controlling the temperature of a cold fresh warehouse and a preparation method thereof, the phase-change material comprises the following components in percentage by weight: 10-12% of calcium chloride hexahydrate, 5-7% of ammonium chloride, 5-7% of strontium chloride hexahydrate and the balance of carboxymethyl cellulose, and the urea accounts for 10-12% of the weight of the calcium chloride hexahydrate. The strontium chloride hexahydrate accounts for 3%-5% of the weight of the calcium chloride hexahydrate, and the carboxymethyl cellulose accounts for 2%-4% of the weight of the calcium chloride hexahydrate. The phase-change material module is installed on the top and the side face of the cold fresh storage to absorb heat or release heat under the action of the heat exchange device through the change of the solid state and the liquid state, so that the temperature in the cold fresh storage is adjusted, and the blank in the engineering application of the phase-change material cold chain in the prior art is filled up.

The invention discloses a multi-stage fractional crystallization device for preparing 3N electronic-grade strontium chloride, which comprises a dissolving tank, the outer wall of which is vertically connected with a liquid supply pipe; the filtering tank is arranged on one side of the dissolving tank, a liquid outlet is formed in the lower end of the dissolving tank, and the liquid outlet is communicated with the filtering tank through an infusion pump; the frame is fixed outside the filtering tank; the first-stage crystallizer and the second-stage crystallizer are vertically assembled on the frame; the discharge pipe is vertically connected below the first-stage crystallizer and the second-stage crystallizer; the solid-liquid separation device is fixed on one side, close to the secondary crystallizer, of the frame; the material guide pipe is horizontally connected below the solid-liquid separation device; according to the multi-stage fractional crystallization device, impurities are separated through step-by-step crystallization by utilizing solubility difference at different temperatures, and strontium chloride is purified.

The invention discloses a carbon-supported platinum-based nanoparticle and a preparation method thereof, and belongs to the field of proton exchange membrane fuel cell cathode catalysts, the carbon-supported platinum-based nanoparticle comprises the following raw materials by weight: 0.4-2 parts of carbon powder, 0.1-2 parts of a complexing agent, 1 part of a platinum salt, 0.3-3 parts of a soluble transition metal salt, 0.1-0.5 part of a soluble alkaline earth metal salt, and 0.2-0.6 part of a precipitant, the soluble alkaline earth metal salt is at least one of beryllium chloride, magnesium chloride, calcium chloride, strontium chloride and barium chloride, the invention provides a'bidirectional dynamic range limiting 'method, on one hand, the problems that a traditional template method is complex in operation step, poor in range limiting effect and difficult to remove a subsequent template are solved; on the other hand, the current situation that nanoparticles synthesized by a traditional coprecipitation method are prone to agglomeration and uneven in particle size is improved, and a new thought is provided for preparation of platinum-based alloy.

The invention discloses a dry storage method for a strontium-doped pure titanium implant. The method is particularly suitable for the strontium-doped pure titanium implant stored for a long time, so that the super-hydrophilicity of the implant is maintained, and hydrocarbon pollutant pollution in air is prevented. The method comprises the following steps: soaking a freshly prepared strontium-doped pure titanium implant in a mixed solution of 0.1 mol / L potassium chloride and 0.1 mol / L strontium chloride for 12 hours, and then air-drying the implant in a super clean bench for 2 hours to form a salt layer protection layer, so that surface active sites are prevented from being exposed in air to gradually lose hydrophilicity, and meanwhile, the problem that strontium ions are released too early due to wet storage is avoided. The protective layer may have the potential of hydrophilic protection for 3-5 years, the implant is flushed and removed by normal saline before an implantation operation so as to ensure the biological safety of the material, and the stored super-hydrophilic surface can accelerate the osseointegration performance of the material, optimize the implantation effect of the material and shorten the waiting time of a patient from the implantation operation to final tooth wearing.