CN113856580A - Process method for preparing superfine powder under multi-field coupling environment - Google Patents
Process method for preparing superfine powder under multi-field coupling environment Download PDFInfo
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- CN113856580A CN113856580A CN202111195287.4A CN202111195287A CN113856580A CN 113856580 A CN113856580 A CN 113856580A CN 202111195287 A CN202111195287 A CN 202111195287A CN 113856580 A CN113856580 A CN 113856580A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/0006—Controlling or regulating processes
- B01J19/0013—Controlling the temperature of the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
- B01J19/10—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing sonic or ultrasonic vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/26—Nozzle-type reactors, i.e. the distribution of the initial reactants within the reactor is effected by their introduction or injection through nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J3/00—Processes of utilising sub-atmospheric or super-atmospheric pressure to effect chemical or physical change of matter; Apparatus therefor
- B01J3/04—Pressure vessels, e.g. autoclaves
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/08—Ferroso-ferric oxide (Fe3O4)
Abstract
The invention discloses a process method for preparing superfine powder under a multi-field coupling environment, which relates to a process method for preparing the superfine powder. The process equipment consists of three parts: an impinging stream reactor, a temperature control system to monitor temperature and an ultrasound system to apply ultrasonic excitation. The invention can promote the preparation of the superfine powder together by the synergistic effect of a plurality of systems. The production efficiency and the reaction rate are effectively improved, the size and the distribution of the particles can be regulated, the preparation of the ultrafine powder particles with controllable particle size, narrow particle size distribution and good dispersibility is facilitated, the device is simple, convenient and practical, the use is convenient, the device is suitable for industrial requirements under different process conditions, and the industrial application prospect is good.
Description
Technical Field
The invention relates to a powder preparation process method, in particular to a process method for preparing superfine powder in a multi-field coupling environment.
Background
The impinging stream is a new process strengthening technology, and the main idea is that two or more streams of fluid collide with each other to generate a highly turbulent impinging zone to realize the strengthening of heat and mass transfer in the reaction process, so that the impinging stream is widely applied to the fields of mixing, drying, absorption, combustion, crystallization, superfine powder preparation and the like.
As the liquid continuous phase impinging stream has high-efficiency micromixing efficiency and strong pressure fluctuation, the research focus of the impinging stream technology gradually begins to transfer from the gas phase impinging stream to the liquid phase impinging stream, and the industrial application field of the impinging stream technology is greatly expanded.
The superfine powder has peculiar surface effect, small size effect, quantum effect and macroscopic quantum tunnel effect due to the change of surface molecular arrangement, electron distribution structure and crystal structure, so that the superfine powder has a series of excellent physical, chemical and boundary and interface properties.
At present, the preparation of ultrafine powder is mainly a liquid phase method, and the liquid phase method for preparing nano materials by using an impinging stream technology is widely applied, such as a chemical reaction-precipitation method, a water/solvent thermal synthesis method, a micro-emulsion method and a sol-gel method.
However, the powder shape and particle size are easily affected by the flow, material concentration and temperature, and the problems of low synthesis efficiency, high production cost and harsh reaction environment exist.
Disclosure of Invention
The invention aims to provide a process method for preparing ultrafine powder under a multi-field coupling environment, which couples an impinging stream technology and an ultrasonic technology, further strengthens the heat and mass transfer process in an impinging flow field under the oscillation shearing action of the ultrasonic convection field, greatly improves the turbulence degree of a system, realizes the uniform mixing of reactants, promotes the generation of a solid phase, effectively regulates and controls the size and distribution of particles, promotes the formation of particle crystal nuclei and inhibits the growth of the crystal nuclei, and obviously improves the production efficiency of ultrafine powder.
The purpose of the invention is realized by the following technical scheme:
a process method for preparing superfine powder under a multi-field coupling environment is characterized in that a process method for preparing superfine powder under the multi-field coupling environment is a process method for preparing superfine powder under the multi-field coupling environment, namely a coupling temperature field, a velocity field and an ultrasonic field, an area which is favorable for generating the superfine powder is formed in a reactor, and superfine powder particles with controllable particle size and uniform distribution are prepared through the synergistic effect of the velocity field, the temperature field and the ultrasonic field;
the preparation method comprises the following specific steps:
(1) setting reaction conditions such as feeding flow, nozzle spacing and diameter ratio, feeding concentration, reaction temperature, impact time, ultrasonic power and other process conditions according to the crushed materials;
(2) when the two materials are mixed and crushed, one of the materials to be crushed is prepared into a mixed solution and then is added into a feed barrel to be uniformly stirred, and the other material to be crushed is prepared into a solution and then is added into an upper layer feed barrel to be uniformly stirred;
(3) checking equipment, switching on a power supply, starting a centrifugal pump, adjusting the flow rate to enable two reaction materials to form impact in the impinging stream reactor, and carrying out primary reaction; after the reaction medium is filled in the reactor, starting an ultrasonic generator, adjusting the power of the ultrasonic generator, and carrying out ultrasonic reinforcement on the impact flow field;
(4) setting reaction temperature according to the material type, and adjusting the reaction temperature in the reactor through a heat exchange pipe;
(5) after the reaction product is discharged from a discharge port, closing valves at two sides and a centrifugal pump, closing an ultrasonic power supply, and collecting a product;
(6) washing the resultant mixed solution with distilled water repeatedly, filtering, drying, or further grinding to obtain superfine powder.
The process method for preparing the superfine powder under the multi-field coupling environment comprises the following steps: the system comprises an impinging stream reactor, a temperature control system for monitoring temperature and an ultrasonic system for applying ultrasonic excitation; the process equipment impinging stream reactor comprises an elliptical top cover seal head, a conical seal head, a shell, a pressure gauge, a thermometer, an exhaust interface, a heat exchange coil, a feeding pipe, a detachable nozzle, a connecting pipe and a flange; the auxiliary equipment comprises a liquid storage tank and a circulating pump; the temperature control system comprises a reactor, a temperature controller and a temperature display, wherein a plurality of groups of detachable spiral coils are arranged in the reactor, and the detachable spiral coils are externally connected with the temperature controller and the temperature display; the ultrasonic system comprises an ultrasonic generator and an ultrasonic vibrator; the ultrasonic generator is a main driving source of the ultrasonic system, and converts electric energy into an electric signal by using an excited oscillation circuit so as to drive equipment to work.
The process method for preparing the superfine powder under the multi-field coupling environment is characterized in that the whole shell of a process equipment reactor is an upright cylindrical barrel, an elliptical top cover end socket is arranged at the upper part of the upright cylindrical barrel, a conical end socket is arranged at the lower part of the upright cylindrical barrel, a heat exchange coil is connected to the inner wall of a shell and spirally surrounds the whole flow field from top to bottom, and a heat exchange medium circularly flows in the coil under the regulation and control of a temperature control system; the two groups of feed pipes are coaxially opposite and have the same diameter and length; one end of the feeding pipe is provided with a convergent nozzle, the other end of the feeding pipe is connected with the liquid storage tank and the water pump, and the ratio between the distance between the opposite nozzles and the diameter of the nozzles is freely adjusted according to the actual condition and the process requirement; the outer side of the lower end of the reactor is provided with an ultrasonic system, and an ultrasonic vibrator consists of an ultrasonic transducer and an ultrasonic amplitude transformer and converts high-frequency electric energy into an ultrasonic signal and transmits the ultrasonic signal; the ultrasonic vibrator is formed by connecting a plurality of ultrasonic vibrators in series and is fixed on the outer side of the lower end of the reactor; the liquid level in the impinging stream reactor is required to meet the requirement of the lowest liquid level required by the ultrasonic vibrator; the two ends of the feeding pipe are provided with internal threads and are provided with the tapered nozzles with different tapers and diameters, so that the mixing effect of materials in the reactor is further promoted under the condition that the nozzles are not blocked by the materials, and the impact speed and the impact area of outlet fluid are increased.
The process method for preparing the superfine powder in the multi-field coupling environment is characterized in that a plurality of groups of heat exchange coil pipes are additionally arranged in the reactor, a temperature display and a controller are externally connected, the circulation flow of a heat exchange medium is controlled by the temperature controller, different reaction temperatures are adjusted according to the preparation requirements of reactants, the heat exchange coil pipes are good in heat conduction performance and spirally surround a flow field area, so that the heat exchange area is increased, and the heat exchange efficiency is improved.
The process method for preparing the superfine powder under the multi-field coupling environment is characterized in that a conical end socket of the reactor is fixed with a plurality of groups of ultrasonic vibrators distributed in an array manner, and an external ultrasonic generator jointly forms an ultrasonic system of the reactor.
The process method for preparing the ultrafine powder under the multi-field coupling environment is characterized in that the frequency of the ultrasonic generator is fixed, the power is freely adjusted according to the size of the required particle size within the required range, the ultrasonic system converts an electric signal into a mechanical signal and applies the mechanical signal to a flow field, and the complete system has a synergistic effect to jointly promote the preparation of the ultrafine powder.
The invention has the advantages and effects that:
1. the invention has the greatest technical characteristics that the ultrasonic technology and the impinging stream technology are effectively combined, a novel process method for preparing the superfine powder is provided, and the impinging stream reactor corresponding to the novel process method is designed, and the reactor simultaneously comprises a temperature control system and an ultrasonic system. The materials are mixed and reacted in the impinging stream reactor, an ultrasonic field is superposed in a turbulent flow field of an impinging zone, the materials are further dispersed and mixed by utilizing the shearing oscillation action of ultrasonic waves, the temperature of a reaction environment is adjusted in the process, the reaction precipitation process is strengthened, uniform nucleation is promoted, the particle size of the powder is effectively regulated and controlled, and various superfine powders are prepared efficiently and conveniently.
The method of the invention takes the impinging stream technology as a main design concept, and fully combines the characteristics that the impinging stream technology and the ultrasonic technology can strengthen micromixing and promote interphase transfer and the like to prepare the superfine powder.
2. The reaction device can effectively form a high and uniform supersaturation reaction environment required by the preparation of the superfine powder by colliding a plurality of strands of fluid; on the other hand, high-speed collision among the particles can reduce particle agglomeration, promote particle crystal nucleus formation and inhibit crystal nucleus growth, and obviously improve production efficiency. The reactor is internally and additionally provided with a plurality of groups of heat exchange coil pipes, is externally connected with a temperature control device, and is internally provided with a heat circulating pump, a temperature sensor and other equipment to realize real-time regulation and control of the temperature in the reactor.
The nozzle is designed to be detachable and has certain taper in the structure of the device, the nozzles with different tapers and inner diameters are changed according to production requirements, initial speed and turbulent kinetic energy of materials when the materials are sprayed out from the nozzles can be effectively improved, and the mixing uniformity of two flows in an impact area is increased. The ultrasonic vibrator and the reactor are fixed together on the structure of the device, an electric signal is converted into a mechanical vibration signal through an energy converter in the ultrasonic vibrator, and the ultrasonic signal is transmitted to an impinging stream flow field through vibration.
3. The invention can promote the preparation of the superfine powder together by the synergistic effect of a plurality of systems. The production efficiency and the reaction rate are effectively improved, the size and the distribution of the particles can be regulated, the preparation of the superfine powder particles with controllable particle size, narrow particle size distribution and good dispersibility is facilitated, the device is simple, convenient and practical, the use is convenient, the device is suitable for the preparation of superfine powder of different materials under various process conditions, and the industrial application prospect is good.
Drawings
FIG. 1 is a schematic diagram of the overall structure of an impinging stream reactor for preparing ultrafine powder in a multi-field coupling environment according to the present invention;
FIG. 2 is an enlarged view of a portion of the nozzle and feed tube of the present invention;
FIG. 3 shows Fe prepared by the present invention3O4Scanning electron microscope images of the ultrafine particles.
The components in the figure: the device comprises an upper elliptical seal head 1, a heat exchange interface 2, a shell 3, a left side feeding pipe 4, a left side nozzle 5, a conical seal head 6, an ultrasonic vibrator 7, a discharge port flange 8, an ultrasonic generator 9, a pump 10, a spiral heat exchange pipe 11, a right side nozzle 12, a right side feeding pipe 13, an overflow port 14, an exhaust port 15, a pressure gauge 16, a thermometer 17, a liquid storage barrel 18, a stop valve 19, a temperature controller 20, an electromagnetic flowmeter 21 and threads 22.
Detailed Description
The present invention will be described in detail with reference to the embodiments shown in the drawings.
The elliptical seal head 1 at the upper end and the conical seal head 6 at the lower end of the device are connected with the shell 3 through flanges to form a detachable structure, so that the device is convenient to clean and maintain at a later stage; the positions of various measuring instruments such as a thermometer 17 and the like are reserved in the hole of the elliptical seal head at the upper part, and the detection range of each measuring instrument is related to an impact area in the reactor as far as possible; similarly, the positions of the exhaust port 15 and the overflow port 14 are reserved on the shell, and both the exhaust port and the overflow port can be provided with small flanges; a discharge port flange 8 is welded and fixed at the straight pipe end of the lower conical seal head 6; the feeding pipe is in threaded connection with the nozzle, the electromagnetic flowmeter 21 is installed on the feeding pipe, external threads are designed at the tail part of each type of nozzle, the disassembly and the replacement are convenient, and the taper of the nozzle is designed to be 10-15 degrees; the ultrasonic vibrators 7 are distributed and fixed on the conical seal head 6 in an annular array, and the two ultrasonic vibrators shown in the figure 1 are only schematic; the temperature controller 20 is connected with the heat exchange interface 2 through a heat insulation pipe, so that the heat exchange medium is transported efficiently.
The material is sprayed out from the cone nozzle to form a high turbulence impact area suitable for the generation of superfine powder in the center of the cavity after the flow of the material is regulated by the circulating pump and the electromagnetic flowmeter at the beginning of the reaction, the reactants are quickly mixed and reacted by the high pressure and the high turbulence intensity in the impact area, meanwhile, the mixed fluid impacts the wall of the cylindrical reactor to generate backflow, and the backflow material can reenter the impact area to generate secondary impact. The high turbulence intensity in the impact area can not only enable the crystal nucleus of the superfine powder to be generated more quickly and uniformly, but also can effectively inhibit particle agglomeration, the impact area is further enhanced in turbulence degree due to the secondary backflow of materials, the residence time of reactants in the impact area is greatly increased, the preparation efficiency of the superfine powder is effectively improved, and the waste of the materials is prevented.
The ultrasonic generator can be started when the reaction medium is full of the reactor, the reactor generates an ultrasonic field through the ultrasonic vibrator at the lower end of the flat-bottom end socket, the ultrasonic generator can adjust the ultrasonic frequency and can automatically adjust according to the required particle size of the superfine powder and the reaction time. The larger the ultrasonic power is switched on, the shorter the reactant mixing time is, and the faster the mixing speed is; meanwhile, due to the addition of the ultrasonic excitation function in the impact flow field, the highly turbulent flow field further generates a violent shearing function, and a larger vortex can be broken into a smaller vortex under the strong shearing function, so that an entrainment function is formed on more flow field areas, and the mixing reaction is further accelerated. Meanwhile, a plurality of micro bubbles can be generated when the ultrasonic wave is conducted to the wall of the reactor, and the bubbles can release a large amount of energy at the moment of collapse, namely, a micro cavitation effect is generated, so that the disturbance of a flow field is increased, and the generated ultrafine powder particles are uniform and have smaller particle size.
In the process of preparing the superfine powder, attention is paid to observing the ambient temperature, the production temperature to be kept is set in a temperature controller in advance, the temperature controller controls the heat exchange medium with a certain temperature to circularly flow in the coil pipe to keep the temperature of the flow field, and the reaction is ensured to be carried out at the most suitable ambient temperature. After the reaction is carried out to a certain degree, the pressure in the reactor can be adjusted through the vent hole at the upper end; before the product is collected, the concentration of the product can be sampled and detected through an overflow port, the process requirement is met, and then the discharge port at the bottom is opened to collect the product in a unified manner.
Example 1: fe3O4Preparation of
Raw materials: FeCl2·4H2O、FeCl3·6H2O and NaOH.
Working conditions are as follows: feed rate 800 L.h-1Nozzle spacing to diameter ratio L/D =3, feed concentration c (Fe)3+)=0.4mol·L-1Iron ion concentration ratio c (Fe)2+)：c(Fe3+) Reaction temperature of 30 DEG, impact time of 30min, ultrasonic power of 400W
1 FeCl2·4H2O and FeCl3·6H2O is prepared into 0.4mol/L mixed solution, then added into the left upper layer charging bucket and stirred evenly, NaOH is prepared into 0.16 mol.L-1The solution was added to the upper right feed drum and stirred well.
2, checking the equipment, switching on the power supply, starting the centrifugal pumps at two sides, and adjusting the flow rate to 800 L.h-1Two reactants are impacted in the impact flow reactor to carry out primary reaction. And after the reaction medium is filled in the reactor, starting the ultrasonic generator, adjusting the power of the ultrasonic generator to 400W, and carrying out ultrasonic strengthening on the impact flow field.
3, regulating the reaction temperature in the reactor through a heat exchange pipe to maintain the temperature in the reactor between 25 and 35 ℃, and experiments show that the ferroferric oxide produced at the temperature has the smallest particle size and is distributed more uniformly.
4, discharging the product after the reaction through a discharge hole, closing the valves at the two sides and the centrifugal pump, closing the ultrasonic power supply, and collecting the product.
5 finally washing the resultant mixed solution repeatedly with distilled water to pH 7, filtering, drying at 60 deg.C for 24 hr, and grinding to obtain Fe3O4The powder is shown in FIG. 3.
Claims (6)
1. A process method for preparing superfine powder under a multi-field coupling environment is characterized in that the process method for preparing the superfine powder under the multi-field coupling environment is a coupling temperature field, a velocity field and an ultrasonic field, an area which is beneficial to the generation of the superfine powder is formed in a reactor, and superfine powder particles with controllable particle size and uniform distribution are prepared through the synergistic effect of the velocity field, the temperature field and the ultrasonic field;
the preparation method comprises the following specific steps:
(1) setting reaction conditions such as feeding flow, nozzle spacing and diameter ratio, feeding concentration, reaction temperature, impact time, ultrasonic power and other process conditions according to the crushed materials;
(2) when the two materials are mixed and crushed, one of the materials to be crushed is prepared into a mixed solution and then is added into a feed barrel to be uniformly stirred, and the other material to be crushed is prepared into a solution and then is added into an upper layer feed barrel to be uniformly stirred;
(3) checking equipment, switching on a power supply, starting a centrifugal pump, adjusting the flow rate to enable two reaction materials to form impact in the impinging stream reactor, and carrying out primary reaction; after the reaction medium is filled in the reactor, starting an ultrasonic generator, adjusting the power of the ultrasonic generator, and carrying out ultrasonic reinforcement on the impact flow field;
(4) setting reaction temperature according to the material type, and adjusting the reaction temperature in the reactor through a heat exchange pipe;
(5) after the reaction product is discharged from a discharge port, closing valves at two sides and a centrifugal pump, closing an ultrasonic power supply, and collecting a product;
(6) washing the resultant mixed solution with distilled water repeatedly, filtering, drying, or further grinding to obtain superfine powder.
2. The process method for preparing ultrafine powder under the multi-field coupling environment according to claim 1, wherein the apparatus in the process method comprises three parts: the system comprises an impinging stream reactor, a temperature control system for monitoring temperature and an ultrasonic system for applying ultrasonic excitation; the process equipment impinging stream reactor comprises an elliptical top cover seal head, a conical seal head, a shell, a pressure gauge, a thermometer, an exhaust interface, a heat exchange coil, a feeding pipe, a detachable nozzle, a connecting pipe and a flange; the auxiliary equipment comprises a liquid storage tank and a circulating pump; the temperature control system comprises a reactor, a temperature controller and a temperature display, wherein a plurality of groups of detachable spiral coils are arranged in the reactor, and the detachable spiral coils are externally connected with the temperature controller and the temperature display; the ultrasonic system comprises an ultrasonic generator and an ultrasonic vibrator; the ultrasonic generator is a main driving source of the ultrasonic system, and converts electric energy into an electric signal by using an excited oscillation circuit so as to drive equipment to work.
3. The process method for preparing ultrafine powder under the multi-field coupling environment according to claim 1 or 2, wherein the whole shell of the process equipment reactor is a vertical cylindrical barrel, the upper part of the shell is provided with an elliptical top cover end socket, the lower part of the shell is provided with a conical end socket, the heat exchange coil is connected to the inner wall of the shell and spirally surrounds the whole flow field from top to bottom, and the heat exchange medium circularly flows in the coil under the regulation and control of a temperature control system; the two groups of feed pipes are coaxially opposite and have the same diameter and length; one end of the feeding pipe is provided with a convergent nozzle, the other end of the feeding pipe is connected with the liquid storage tank and the water pump, and the ratio between the distance between the opposite nozzles and the diameter of the nozzles is freely adjusted according to the actual condition and the process requirement; the outer side of the lower end of the reactor is provided with an ultrasonic system, and an ultrasonic vibrator consists of an ultrasonic transducer and an ultrasonic amplitude transformer and converts high-frequency electric energy into an ultrasonic signal and transmits the ultrasonic signal; the ultrasonic vibrator is formed by connecting a plurality of ultrasonic vibrators in series and is fixed on the outer side of the lower end of the reactor; the liquid level in the impinging stream reactor is required to meet the requirement of the lowest liquid level required by the ultrasonic vibrator; the two ends of the feeding pipe are provided with internal threads and are provided with the tapered nozzles with different tapers and diameters, so that the mixing effect of materials in the reactor is further promoted under the condition that the nozzles are not blocked by the materials, and the impact speed and the impact area of outlet fluid are increased.
4. The process method for preparing ultrafine powder under the multi-field coupling environment according to claim 3, wherein a plurality of sets of heat exchange coils are additionally arranged inside the reactor, the external temperature display and the controller control the circulating flow of the heat exchange medium through the temperature controller, different reaction temperatures are adjusted according to the preparation requirements of reactants, the heat exchange coils have good heat conductivity and spirally surround the flow field area to increase the heat exchange area and improve the heat exchange efficiency.
5. The process method for preparing ultrafine powder under the multi-field coupling environment according to claim 3, wherein a plurality of groups of ultrasonic vibrators distributed in an array are fixed on the conical end socket of the reactor, and an external ultrasonic generator jointly forms an ultrasonic system of the reactor.
6. The process method for preparing ultrafine powder under the multi-field coupling environment according to claim 5, wherein the frequency of the ultrasonic generator is fixed, the power is freely adjusted according to the required particle size within the required range, the ultrasonic system converts the electric signal into a mechanical signal and applies the mechanical signal to the flow field, and the complete system has a synergistic effect to jointly promote the preparation of ultrafine powder.
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| CN114432987A (en) * | 2022-01-06 | 2022-05-06 | 沈阳化工大学 | Method for continuously preparing calcium carbonate superfine powder by secondary impact reaction |
| CN114455639A (en) * | 2022-01-10 | 2022-05-10 | 沈阳化工大学 | Method for preparing ferroferric oxide nano-grade superfine powder by direct current swirling and colliding mixing |
| CN114733456A (en) * | 2022-02-28 | 2022-07-12 | 南开大学 | Liquid-drop impact micro-reactor and method for continuously preparing nano-material |
| CN114950286A (en) * | 2022-05-24 | 2022-08-30 | 西北核技术研究所 | Aerosol generating device suitable for dry dispersion of ultrafine powder |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20211231 |