497 results about "Spray dryer" patented technology

The invention provides a method for preparing high-purity and fine-particle-size lithium sulfide based on carbon thermal reduction. The method comprises the following steps: weighing lithium sulfate monohydrate, an insoluble inorganic carbon source and cysteine in a set proportion to form a raw material mixture; mixing the raw material mixture with water according to a set solid-to-liquid ratio, performing ultrasonic dispersion to obtain homogeneous dispersion liquid, and enabling the dispersion liquid to pass through a nitrogen circulating spray dryer to obtain uniform and dry precursor powder; in a vacuum environment, carrying out segmented calcination to obtain a crude product lithium sulfide; and in a dry and anhydrous environment, washing the crude product lithium sulfide for multiple times by using absolute ethyl alcohol according to a set liquid-solid ratio to obtain an alcoholic solution containing lithium sulfide, and then obtaining lithium sulfide fine powder through a nitrogen circulating spray dryer. The invention solves the problems of side reaction, low purity, large product particles, uncontrollable particle size and the like of lithium sulfide prepared by a carbon thermal reduction method in the prior art.

The invention discloses a preparation method of high-rhenium and low-oxygen spherical tungsten-rhenium alloy powder, which comprises the following steps: proportioning tungsten powder and rhenium powder, adding into a ball mill for ball milling and mixing to obtain uniform composite powder slurry; the composite powder slurry is fed into a spray dryer to be subjected to spray granulation to form sphere-like alloy powder; and the spheroidized powder is subjected to plasma spheroidizing treatment to form the spherical tungsten-rhenium alloy powder. According to the preparation method disclosed by the invention, the tungsten-rhenium suspension slurry with uniformly dispersed components is prepared, and then granulation and spheroidization are carried out, so that the uniform state of the suspension is successfully solidified, oxygen can be reduced, impurities can be removed, and the spherical alloy powder with relatively large granularity and unlimited rhenium adding amount is prepared. The technical route flow is short, the process controllability is high, pilot scale production can be achieved, and the prepared tungsten-rhenium alloy spherical powder is high in density, sphericity degree and uniformity and low in oxygen content.

The embodiment of the invention provides a preparation method of a tungsten-copper alloy and the tungsten-copper alloy, and relates to the technical field of alloy preparation.The method comprises the steps that superfine tungsten oxide powder, tungsten salt, copper salt and a polymer additive are added into deionized water to be evenly mixed, and a precursor mixed solution is obtained; carrying out spray granulation on the precursor mixed solution by adopting a spray dryer to obtain spherical tungsten-copper precursor composite powder; roasting the spherical tungsten-copper precursor composite powder to obtain tungsten-copper oxide composite powder, and carrying out segmented reduction on the tungsten-copper oxide composite powder to obtain tungsten-copper composite powder with tungsten grains having a nanocrystalline / ultra-fine grain bimodal distribution characteristic; and the tungsten-copper composite powder is pressed to obtain an alloy blank, the alloy blank is sintered, and the tungsten-copper alloy is prepared. According to the double-peak distribution tungsten-copper composite powder, full densification of the alloy can be promoted through coupling rearrangement of large and small tungsten particles in the sintering process, and the compactness, the heat conductivity and the electric conductivity of the tungsten-copper alloy can be improved.

A power plant desulfurization wastewater treatment method belongs to the technical field of water treatment. The method comprises the following steps: S1, pretreatment of the desulfurization wastewater: adding a coagulant and a polymer coagulant aid to remove suspended solid particles in the desulfurization wastewater to obtain pretreated effluent; s2, collecting sludge generated by pretreatment; s3, feeding the desulfurization wastewater into an ozone catalytic reactor, and catalyzing ozone oxidation by using a heterogeneous solid catalyst to remove ammonia in the desulfurization wastewater; s4, adding calcium sulfate seed crystal and desulfurization wastewater, uniformly mixing in a seed crystal mixer, and feeding into a triple-effect circulating evaporation concentrator; s5, allowing the concentrated solution desulfurization wastewater to enter a crystal collection tank for precipitation, discharging and recycling large-particle crystals, allowing supernate in the collection tank to flow back to the crystal seed mixer for supplementing crystal seeds, and feeding effluent of the collection tank into a rotary spray dryer for treatment; and S6, carrying out rotary spray drying on the concentrated solution desulfurization wastewater to realize zero discharge of the wastewater. The method is used for treating the desulfurization wastewater of the power plant.

The invention provides a titanium carbide preparation process, and relates to the technical field of carbide preparation, the titanium carbide preparation process comprises the following steps: S1, selecting ilmenite with the phosphorus content of less than 100 ppm, crushing, reducing, concentrating, hydrolyzing, washing and filtering to generate a titanium dioxide filter cake; the pore diameter of titanium dioxide is controlled to be 1-5nm, the phosphorus content is less than 50ppm, and the sulfur content is less than 0.1%; s2, pulping the titanium dioxide filter cake obtained in the step S1 to form primary slurry, adding carbon black according to the content of titanium dioxide, and uniformly stirring to form secondary slurry; s3, continuously stirring the secondary slurry, and pumping the secondary slurry into a spray dryer for spray drying to generate titanium dioxide-carbon black particles; and S4, the titanium dioxide-carbon black particles pass through a high-temperature roasting area under the action of airflow and gravity to generate titanium carbide powder. According to the method, the mixing uniformity of the carbon black is larger than or equal to 95%, the yield of the titanium carbide is increased to 99.5% or above, and the quality and the yield of the finished titanium carbide are greatly improved.

The invention relates to the technical field of lithium ion batteries, in particular to a silicon negative electrode material for a solid-state battery and a preparation method of the silicon negative electrode material. The preparation method of the silicon negative electrode material for the solid-state battery comprises the following steps: by taking micron silicon as a raw material, obtaining nano silicon particles by adopting a liquid-phase sanding method, and then carrying out spray thermal polymerization and drying granulation treatment on precursor slurry by using a spray dryer, thereby obtaining the silicon negative electrode material for the solid-state battery. Carrying out in-situ polymerization on the surface of the nano silicon to construct an elastic electron-ion dual-conductive polymer solid electrolyte coating layer; the obtained nanometer silicon composite material realizes excellent solid-solid contact in the pole piece and between the pole piece and a solid electrolyte interlayer under low external pressure, and interface charge transfer impedance is reduced; in addition, the elastic coating layer has good compressibility and deformability, effectively buffers the lithium intercalation volume of nano silicon, even can increase the internal stress of the pole piece by means of expansion, compactly compact powder particles in the negative electrode, and improve the electron and ion transmission of the solid-state battery.

The invention discloses a preparation method of an efficient lithium oxalate lithium supplement agent, and relates to the field of preparation of lithium ion battery positive electrode lithium supplement agents, and the preparation method comprises the following steps: S1, adding CNTs into an organic solvent for ultrasonic cleaning, then cleaning the CNTs with pure water, and finally drying; s2, concentrated sulfuric acid and concentrated nitric acid are prepared into a mixed acid solution, CNTs are added, and ultrasonic reflux is carried out; then cleaning the CNTs until the washing water is neutral, and finally drying to obtain oxidized CNTs; s3, the oxidized CNTs and (NH4) 2MoS4 are dissolved in water, then the precursor solution is atomized into micron-sized liquid drops, the micron-sized liquid drops are cracked in an inert atmosphere, and a three-dimensional composite material MoSx-CNTs is prepared; and S4, dissolving the three-dimensional composite material MoSx-CNTs and lithium oxalate in an ethanol solution, and drying in an inert atmosphere in a high-pressure spray dryer to obtain the lithium oxalate-coated MoSx-CNTs composite material. According to the invention, low-voltage and efficient decomposition of lithium oxalate is realized by regulating and controlling metal nodes and pore structures of MOFs, and meanwhile, the damage of residues to the microstructure of the battery is avoided.

The invention discloses a method for purifying sialic acid from fermentation liquor, and belongs to the field of biochemical engineering separation and purification. The method comprises the following steps: firstly, concentrating sialic acid biological fermentation liquor by adopting membrane separation, adjusting the pH value of the concentrated liquor to 7-11, loading a sample on a boric acid affinity chromatography column, respectively washing with water and acid water, and collecting a sialic acid eluate; adjusting the pH value of the saliva acid eluate to 5-10, loading the saliva acid eluate to anion exchange resin, washing with water and acid water to obtain a resin desorption solution, and adding the resin desorption solution into a spray dryer for drying to obtain a sialic acid finished product. The stable five-membered ring complex is generated by utilizing the action of a boric acid group and a dihydroxyl structure in sialic acid. According to the method, the sialic acid is subjected to complexing under an acidic condition, molecules are eluted from a medium, selective separation of the sialic acid is realized, the sialic acid is further refined and purified by adopting anion exchange resin, high-purity sialic acid is prepared, introduction of a crystallization process is avoided, and use of an organic solvent and an acid reagent is greatly reduced.

The utility model relates to the technical field of atomization devices, in particular to an atomization device for a spray dryer, which comprises a mounting frame, a drying atomization mechanism is fixedly connected to one side of the mounting frame, and the drying atomization mechanism comprises a drying barrel, a fixing frame, a centrifugal machine, a connecting rod, a connecting telescopic rod, a vibrating rod, a discharging inclined plate and a discharging port. A fixing frame is fixedly connected to one side of the inner wall of the mounting frame, a drying barrel is fixedly connected to the other side of the fixing frame, and a spiral feeding mechanism is fixedly connected to the surface of the top end of the drying barrel. According to the utility model, the drying and atomizing mechanism is arranged on one side of the mounting rack; the drying barrel is mounted in the mounting frame through the fixing frame; a centrifugal machine and an atomizer at the top end of the drying barrel can be used for uniformly spraying a liquid material through a turntable and a spray head and then carrying out uniformly-mixed heat energy exchange with hot air entering from a screw mechanism at the top end of the drying barrel; therefore, the liquid material is thrown into mist by the high-speed atomizer and then is quickly dried into powder after being in contact with hot air.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium nickel cobalt aluminate / carbon composite positive electrode material with a core-shell structure and a spray drying process thereof, the lithium nickel cobalt aluminate / carbon composite positive electrode material comprises the following raw materials: a lithium source, an iron source, a phosphorus source, a carbon source and a solvent; the method specifically comprises the following steps: S1, dissolving a lithium source, an iron source, a phosphorus source and a carbon source in a solvent, mixing according to a stoichiometric ratio, adjusting the pH value by using ammonia water or citric acid, and adding a binder to adjust the viscosity to obtain a precursor solution; s2, atomizing the precursor solution into tiny liquid drops by a centrifugal or pressure type spray dryer through a nozzle or a centrifugal disc, and staying the liquid drops in a tower for 4-10 seconds to obtain a dried microsphere precursor; s3, presintering the dried microsphere precursor in an inert atmosphere at 300-400 DEG C through a firing device, and removing volatile components; and S4, cooling the pre-sintered and dried microsphere precursor, and calcining in the firing device again to form crystals.

The invention discloses a vitamin D3 clathrate compound and a preparation method thereof, and further discloses a calcium carbonate D3 tablet containing the vitamin D3 clathrate compound and a preparation method of the calcium carbonate D3 tablet. The vitamin D3 inclusion compound disclosed by the invention comprises the following components in percentage by mass: 0.05-0.75% of vitamin D3; 80.00 to 99.5 percent of hydroxypropyl-beta-cyclodextrin, and the balance of water; 1.00% to 10.00% of an antioxidant; 0.00 to 5.00% of an anti-sticking agent; wherein the antioxidant is butylated hydroxytoluene (BHT), vitamin E and sodium ascorbate. The invention also provides a preparation method of the vitamin D3 clathrate compound. The preparation method comprises the following steps: dissolving the vitamin D3 and the antioxidant in ethanol; the preparation method comprises the following steps: dissolving hydroxypropyl-beta-cyclodextrin in purified water, and then adding an anti-sticking agent; mixing the two solutions; and drying by using a spray dryer to prepare the vitamin D3 inclusion compound. The vitamin D3 inclusion compound prepared by the invention is high in inclusion rate and yield and can be stably stored for a long time, and a preparation (such as a calcium carbonate D3 tablet) prepared from the inclusion compound meets medicinal requirements, and is good in long-term stability, high in uniformity, simple to prepare and relatively low in cost.

The invention relates to a spherical micron phosphate fertilizer with high fertilizer efficiency and a preparation method thereof. The preparation method of the spherical micron phosphate fertilizer with high fertilizer efficiency comprises the following steps: reacting a crystal form control agent and monocalcium phosphate in water for at least 12 hours, and performing spray drying through a spray dryer to obtain the spherical micron phosphate fertilizer. According to the spherical micron phosphate fertilizer with high fertilizer efficiency and the preparation method thereof, the preparation method is simple, the cost is low, the reaction conditions are mild, and the prepared spherical micron phosphate fertilizer is small in size and high in fertilizer efficiency.

The invention relates to the technical field of spray dryers, and provides a traditional Chinese medicine extract spray dryer which comprises a fixed tank body, a base, a discharging assembly, a charging assembly, an exhaust frame, a drying assembly, a collecting pipe and a collecting assembly, the base is arranged on the side portion of the fixed tank body, the discharging assembly is installed on the base, and the charging assembly is installed at the top of the fixed tank body; the air exhaust frame is fixedly installed on the top of the fixed tank body, the drying assembly is installed on the air exhaust frame, the collecting pipe is communicated with a discharging port of the fixed tank body, the collecting assembly is installed on the fixed tank body, and the collecting assembly is communicated with the other end of the collecting pipe. The problems that due to the fact that particles are different in size, some components volatilize much, the quality of the particles is poor, and follow-up collection is affected are solved.

A method for preparing sodium vanadium fluorophosphate as a positive electrode material for sodium-ion batteries on the basis of spray drying, which method aims to solve the problems of poor electronic conductivity and fluorine loss in sodium vanadium fluorophosphate as a positive electrode material for sodium-ion batteries. The method comprises dissolving a carbon source, a phosphorus source, a sodium source and a vanadium source in water, and then drying same in a spray dryer to obtain a precursor powder; and then uniformly mixing the precursor powder with a fluorine source, and calcining the resulting mixture for 3-6 h to obtain sodium vanadium fluorophosphate, namely, a positive electrode material for sodium ion batteries. The material is made of micron spherical particles having a core-shell structure, the particle size is about 8 μm, the shell thickness is about 200 nm, the initial specific discharge capacity is 110.60 mAh / g at a rate of 1 C, and the specific discharge capacities are 97.90 mAh / g and 74.70 mAh / g at rates of 10 C and 30 C, respectively. The present invention can be used in the field of sodium-ion batteries.

The invention relates to the technical field of cereal milk tea preparation, in particular to sea-buckthorn cereal milk tea and a preparation method thereof.The method comprises the steps that sodium caseinate is stirred and dissolved in deionized water and then subjected to water bath to obtain a sodium caseinate solution, and soy isoflavone is fused into the cooled sodium caseinate solution to obtain a film forming solution; performing vacuum spray drying on the hippophae rhamnoides fruit solution through a vacuum spray dryer to obtain hippophae rhamnoides fruit powder particles, and mixing the film-formed fried rice, the hippophae rhamnoides fruit powder particles and ingredients to obtain the hippophae rhamnoides fruit grain milk tea, determining whether the preparation stability of the hippophae rhamnoides fruit grain milk tea meets the requirement or not based on the maximum difference quantity of the thickness of the film layer on the surface of the film-formed fried rice; determining whether the immersion depth of the stirring blades needs to be increased or not; determining whether the inclination angle of the drum needs to be reduced; and determining the number of cyclic shearing times based on the volume average particle size of the sea buckthorn fruit powder particles. The preparation stability of the hippophae rhamnoides fruit grain milk tea is improved.

The invention relates to the technical field of spray drying, and discloses an environment-friendly spray dryer which comprises a drying tank, a spraying device, a drying device, a scraping device, a discharging pipe, a ventilating pipe and an air filter, a main body of the drying tank is a cylindrical tank, the lower end of the drying tank is funnel-shaped, and the spraying device is arranged on the drying tank and used for spraying mist materials. The drying device is arranged on the drying tank and used for drying vaporific materials, the scraping device is arranged on the drying tank and used for scraping away attached materials, the discharging pipe penetrates through the bottom of the drying tank and is internally and externally communicated, the ventilation pipe penetrates through the side wall of the drying tank and is internally and externally communicated, and the air filter is arranged in the middle of the ventilation pipe. Through circumferential scraping and brushing of the first scraping plate and the second scraping plate, scraping and brushing dead angles are avoided, the problem that materials adhere to the wall is effectively solved, residual accumulation of the materials in equipment is reduced, then waste gas VOCs caused by the fact that the materials adhere to the wall are prevented from being attached to residual dust, and the product quality is improved.

The utility model discloses a three-fluid spray dryer for sodium ion preparation, which comprises a tower body, a cyclone separator is mounted in the tower body, a drying bin is arranged between the top of the cyclone separator and the tower body, a hot-air blower is mounted on the right side of the tower body, the output end of the hot-air blower is connected with an input pipe, and the output end of the input pipe is connected with an output end of the tower body. And the other end of the input pipe is inserted into the tower body and is fixedly connected with a spiral exhaust pipe. A sodium ion solution is atomized and sprayed into the drying bin by matching with the spraying mechanism, the area of the atomized liquid is increased to be in contact with high-temperature air, so that quick drying is realized, meanwhile, the cyclone separator is started to suck in a dried mixture and separate solid particles, and gas is discharged through the discharging mechanism, so that the drying efficiency is improved. And operation of the device is conveniently controlled through the control panel, so that the device has the advantages that hot air makes more uniform contact with atomized liquid, the drying efficiency is higher, and the working efficiency of the device is improved.

The invention relates to the technical field of preparation of a lithium ion battery positive electrode lithium supplement agent, in particular to preparation of a composite lithium supplement agent, which comprises the following steps: dissolving lithium hydroxide and oxalic acid in pure water to prepare a lithium oxalate saturated solution, and adding a metal catalyst; preparing lithium oxalate particles from the lithium oxalate saturated solution containing the metal catalyst through a spray dryer in an inert atmosphere; the lithium oxalate particles are put into a CVD rotary furnace, organic steam is introduced, the organic steam is decomposed through a metal catalyst to generate carbon, and the carbon is deposited on the surface of lithium oxalate; reducing the temperature of the CVD rotary furnace, introducing a silicon source, introducing water vapor, and coating the surface of the material with a SiO2 film; and reducing the temperature of the CVD rotary furnace, introducing a modifier, and carrying out a cross-linking reaction on the modifier and the surface of the material to obtain the final product Li2C2O4 (at) C (at) SiO2 (at) CF3. According to the invention, the defects of lithium oxalate insulation, high decomposition voltage and poor air stability are overcome.

The invention relates to a copper-iron bimetallic Fenton-like catalyst and a preparation method and application thereof.The preparation method comprises the steps that copper salt, iron salt and gamma-Al2O3 are mixed in deionized water and stirred through a mechanical stirring rod, and a mixed steeping liquor is obtained; carrying out spray drying on the mixed impregnation liquid on a spray dryer, and preliminarily removing moisture to obtain a precursor of the copper-iron bimetallic Fenton-like catalyst; and calcining the precursor of the copper-iron bimetallic Fenton-like catalyst in a tubular furnace to obtain the copper-iron bimetallic Fenton-like catalyst. The catalyst provided by the invention has the characteristics of easy recovery, high catalytic activity and the like, and solves the problems of low catalytic efficiency of an iron-based catalyst and difficult recovery of a copper-based catalyst in the prior art.

A high-speed centrifugal spray dryer capable of spraying evenly comprises a dryer body, two connecting plates are fixed to the middle of the dryer body, a connecting box is rotatably connected between the two connecting plates, a suction pump is fixed to the lower end of the dryer body and communicated with a connecting pipe, and the connecting pipe is fixedly connected with the connecting box. A supporting plate is fixed to the drying machine body, two mounting plates are fixed to the supporting plate, a through hole is formed in the supporting plate, an eccentric gear assembly is arranged between the two mounting plates, the eccentric gear assembly comprises a first eccentric gear, a second eccentric gear and two clamping plates, and a first motor is mounted on each mounting plate; connecting rods are rotationally connected to the two sides of the second eccentric gear, a fixing rod is fixedly connected between the two connecting rods, a lifting rod is fixed to the fixing rod, and the bottom end of the lifting rod is rotationally connected with the connecting box. According to the utility model, the spraying angle can be adjusted, and the uniformity of spraying work can be better ensured.

The invention discloses a rapidly synthesized ferric sodium pyrophosphate electrode material, a preparation method thereof and a positive electrode. Relates to the technical field of batteries. The preparation method comprises the following steps: S1, mixing a sodium source, an iron source, a phosphorus source and a carbon source, adding a preset volume of deionized water, and stirring until the raw materials are completely dissolved to obtain a light yellow transparent solution; s2, adding a preset amount of modified carbon nanotubes into the light yellow transparent solution, and dispersing in an ultrasonic environment to obtain a stable suspension; s3, starting a spray dryer, and collecting yellow green spherical precursor powder from a discharge port; s4, placing the yellow green spherical precursor powder obtained by spray drying in a magnetic boat, and carrying out heat preservation at 300 DEG C in a pure argon environment at a heating rate of 2 DEG C / min for 5 h to obtain black powder; and S5, transferring the black powder into Joule thermal equipment, and reacting for a preset time under a preset condition to obtain a final black powdery product. Through innovative process design and material modification, the core problems of long period, poor conductivity, low tap density and the like in the traditional preparation technology are solved.

The invention belongs to the technical field of cosmetics, and particularly relates to ultrasonic-assisted composite protease hydrolyzed pea protein as well as a preparation method and application thereof. The preparation method comprises the following steps: raw material treatment, high-temperature sterilization, ultrasonic enzymolysis of a compound protease mixed solution, enzymatic hydrolysate separation, supernate separation, spray drying and obtaining of a target product pea peptide, pea protein is hydrolyzed by compound protease to obtain the pea peptide with the molecular weight of 6000u or below and an anti-wrinkle function, and enzyme deactivation treatment is performed at high temperature to obtain the pea peptide with the anti-wrinkle function. Filtering by using an ultrafiltration fiber membrane, separating from the inactivated enzymatic hydrolysate, drying by using a spray dryer to prevent oxidation in the drying process, and hydrolyzing the pea protein by using a compound enzyme to obtain the pea protein peptide; the obtained product easily and directly enters deep skin through the surface layer of the skin, is quickly absorbed by the skin of a human body to play a role, and has higher biological activity and bioavailability. The anti-wrinkle peptide is prepared from pea protein, resources can be fully utilized, waste is turned into wealth, and waste of raw materials is reduced.

According to the gasification fine slag dewatering and drying method and system based on the spray dryer, gasification fine slag with high water content can be dewatered and dried, the energy utilization rate is high, and waste of water resources is little. The method comprises the following steps: 1) carrying out flash evaporation concentration, sedimentation and filtration dehydration on the coal gasification black water in the black water treatment unit; (2) gasified fine slag to be treated is fed into a fine slag preheater to be subjected to heat exchange with a heating medium; 3) spraying the preheated gasified fine slag and superheated steam into a spray dryer for heat exchange to obtain dried gasified fine slag and secondary steam; 4) feeding the secondary steam into a secondary steam dust removal unit for dust removal treatment, and then feeding the secondary steam into a fine slag preheater; (5) the secondary steam output by the fine slag preheater is fed into a steam preheater for heat exchange, and preheated secondary steam is obtained; (6) the preheated secondary steam is fed into a steam superheater to be subjected to superheating treatment, and superheated steam is obtained; the superheated steam is fed into a spray dryer.

The utility model discloses a material dispersing mechanism of a drying machine, which belongs to the technical field of drying machines, and comprises a table top, a spray dryer body, a spray drying tank and a discharge pipe, the top of the spray drying tank is fixedly communicated with a feed hopper, and a dispersing mechanism is arranged in the feed hopper. A motor is arranged at the top of the feeding hopper; the dispersing mechanism comprises a first sliding ring, a second sliding ring, a plurality of first dispersing rods and a plurality of second dispersing rods, and the surfaces of the first dispersing rods are fixedly connected with the inner wall of the first sliding ring. The problems that a feeding port of a used spray dryer body is not provided with a structure for dispersing materials, after wet and caked materials are directly added into a spray drying tank, the drying efficiency of the materials in the spray drying tank is affected, the efficiency of biological extraction work is affected, and therefore the using effect is affected are solved.

The invention discloses high-pressure density lithium iron phosphate and a preparation method thereof, and belongs to the field of lithium ion battery positive electrode active materials. The preparation method comprises the following steps: adding high-activity iron phosphate and low-activity iron phosphate into a solvent, stirring, adding lithium carbonate, stirring, adding a carbon source and an additive, and uniformly stirring to obtain slurry; grinding the slurry by using a nanometer grinder, and monitoring the granularity of the ground slurry by using a nanometer granularity analyzer; pumping the ground slurry into a spray dryer, and drying and granulating to obtain a powder material; putting the powder material into a graphite crucible, putting the graphite crucible into a kiln, and sintering under the protection of nitrogen; and crushing and sieving the sintered material to obtain the high-pressure density lithium iron phosphate powder. The high-pressure density lithium iron phosphate material prepared by the invention can provide higher energy density per unit volume, and can be used as a positive electrode active material of a vehicle power type or base station energy storage type lithium battery.

The invention relates to the technical field of tail gas recovery, in particular to a tail gas recovery device for a closed circulating pressure spray dryer, which comprises a heat exchanger body, the heat exchanger body is provided with an inlet and an outlet, and the top end and the bottom end of the heat exchanger body are respectively and fixedly provided with an inner partition plate. An upper shell is fixedly installed at the top end of the heat exchanger body, a lower shell is fixedly installed at the bottom end of the heat exchanger body, a purifier is arranged on the lower shell, a conveying pipe is arranged on the purifier, a heat exchange pipe is arranged on the inner side of the heat exchanger body, and a top connector is formed in the top of the upper shell. According to the invention, the driving motor is controlled to operate, and the frame body is controlled to drive the plurality of salient point rollers and the plurality of shovel bodies to move, so that the plurality of salient point rollers press particles filtered on the filter plate group to the bottom of the filter plate group, and then the shovel bodies shovel off the particles, thereby preventing the particles from blocking the filter plate group, and improving the filtering effect.

The invention relates to the technical field of filling agents, and particularly discloses a lactose and microcrystalline cellulose blend preparation method which comprises the following steps: sieving lactose through a 80-mesh sieve, and removing impurities through ultrasonic assistance; the preparation method comprises the following steps: carrying out surface modification on microcrystalline cellulose by using a silane coupling agent, adding 183L of purified water into a mixing tank, stirring, preheating lactose to 50-60 DEG C, adding, dissolving, adding microcrystalline cellulose, and stirring until the microcrystalline cellulose is swelled; lactose is added and stirred to be uniform, and mixed liquid is obtained; high-temperature air inlet is set for the spray dryer for spray drying. And screening and mixing the dried granules, and packaging the granules with PE (polyethylene) bags, wherein each bag is 20Kg. According to the method, the process is simplified, the energy consumption is reduced, the production efficiency and the product quality are improved, the method is suitable for the pharmaceutical preparation industry, the tedious step that process water is firstly heated and then cooled in the traditional process is omitted, the energy consumption is reduced, the production period is effectively shortened, the consumption of water resources is reduced, and the overall production efficiency is improved.

The utility model relates to the technical field of compound fertilizer processing, and discloses a spray dryer with a stirring mechanism, which comprises a shell, a drying device is fixedly connected above the shell, the stirring mechanism is arranged on the inner surface of the shell, and a cleaning mechanism is arranged above the stirring mechanism. The sliding plate is in sliding fit with the hinged seat in the sliding groove to enable the material placing plate to swing, the sliding seat is driven by the sliding strip to ascend and descend in the sliding groove, the effect of jolting the material placing plate is achieved, materials can be turned over conveniently, and the rotating cylinder is driven by the rotating shaft to rotate to enable the stirring rod to turn over the materials on the material placing plate. The eccentric wheel rotates to drive the connecting rod to swing up and down, the connecting rod swings up and down to drive the sliding block to ascend and descend, the sliding block ascends and descends to drive the connecting strip and the brush to ascend and descend, the outer surface of the rotating cylinder is cleaned through the brush, the brush ascends to enable the cleaning sleeve on the brush sleeve to scrape away materials attached to the surface of the brush, and the cleaning effect is achieved.

The present invention relates to a low-temperature spray drying device, belonging to the technical field of spray dryers. The low-temperature spray drying device includes a fixing frame and a drying tank fixedly connected inside the fixing frame. A tank cover is installed on the top of the drying tank. A gas treatment mechanism and a finished product collection mechanism are installed on the outer surface of the fixing frame. It further includes: a wall scraping mechanism; a gas guiding mechanism; a filter screen; a crushing mechanism; a conveying mechanism. Through the arrangement of the scraper, the present invention enables the scraper to scrape off the atomized materials adhering to the inner wall of the drying tank and the granular materials adhering to the inner wall of the drying tank that are not dried, avoiding the adhesion of materials on the inner wall of the drying tank, resulting in the aggregation of materials, affecting the particle size of the produced finished product, and causing the particle size of the produced finished product to not meet the requirements. Furthermore, it ensures that the particle size of the produced granular materials meets the requirements and that the moisture content of the produced granular materials meets the production requirements.

The invention relates to a high-strength and high-thermal-conductivity silicon carbide composite material and a preparation method thereof. According to the technical scheme, silicon carbide fine powder, diamond powder, monatomic silicon powder, nano-copper powder, nano-graphite powder and a sintering aid serve as raw materials, deionized water is added, the raw materials are mixed and placed in a spray dryer for spray drying, and a mixture I is obtained; mixing the mixture I with a polyvinyl alcohol aqueous solution to obtain a mixture II; and putting the mixture II into a mold, carrying out compression molding, and maintaining the pressure to obtain a silicon carbide composite material green body. The silicon carbide composite material green body is placed in a graphite crucible, then the graphite crucible is placed in a vacuum induction furnace, and heating and heat preservation are conducted under the vacuum condition; and heating, preserving heat and cooling to obtain the high-strength and high-thermal-conductivity silicon carbide composite material. The preparation process is low in energy consumption, and the prepared high-strength and high-thermal-conductivity silicon carbide composite material is high in bending strength, fracture toughness and thermal conductivity.