CN112439559A - Superfine powder gas-phase classification equipment and classification method thereof - Google Patents
Superfine powder gas-phase classification equipment and classification method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/08—Vortex chamber constructions
- B04C5/081—Shapes or dimensions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
- B04C2009/008—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with injection or suction of gas or liquid into the cyclone
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Abstract
The invention discloses a gas phase grading device and a grading method for superfine powder, relating to the technical field of powder grading, and the key points of the technical scheme comprise the following steps: step 1, starting an induced draft fan, and controlling the vacuum degree in a fine powder outlet pipe connected with the induced draft fan to be 35-45kPa until the vacuum degree is stable; step 2, starting an air compressor and a feeder and carrying out gas-phase powder grading, controlling the pressure at an inlet to be 0.2-0.7MPa, the feeding speed to be 5-10kg/h and the grading time to be 30-300 min; step 3, waiting for at least 1min after grading is finished, closing the air compressor and the induced draft fan, starting a back blowing device in the back blowing tank, and finishing back blowing after the back blowing device performs back blowing for 2-4 times of circulation; and 4, taking out the fine powder from the overflow tank, and taking out the coarse powder from the underflow tank. The invention effectively solves the problems of uneven particle size distribution of powder particles, low grading precision and grading efficiency caused by the reduction of the rotational flow movement speed of the superfine powder and the back-mixing short-circuit flow in the cyclone body, thereby achieving the purpose of remarkably improving the grading efficiency and effect of the powder.
Description
Technical Field
The invention relates to the technical field of powder grading, in particular to gas-phase grading equipment and a grading method for ultrafine powder.
Background
The ultrafine powder generally refers to powder with a particle size of not more than 10 μm, wherein powder with a particle size of 0.1-1 μm is called submicron powder, and powder with a particle size of 1-100 nm is called nano powder. The ultrafine powder is classified according to the type of material, and includes various types such as metal, nonmetal, organic, inorganic, and biological. Classification is one of the conventional means for obtaining high-quality powder materials of different specifications in the field of material manufacturing, and since different types of ultrafine powders have different characteristics, technicians often use different classification force fields to effectively classify the ultrafine powders, such as gravity field classification, centrifugal force field classification, inertial force field classification, electric field force classification, magnetic field force classification, thermal gradient force field classification, and chromatography classification, so as to relatively efficiently obtain the ultrafine powder materials of different particle size distributions. The classification methods commonly used include liquid phase classification and gas phase classification, or wet classification and dry classification. The liquid phase classification has the advantages that a product with fine particle size can be obtained, the particle size distribution range of the powder can be controlled in a narrow range, the potential safety hazard of absolute ethyl alcohol in a common liquid phase classification medium is high, water is easy to corrode or oxidize powder materials, the general process of the liquid phase classification is relatively complex, and the production cost is high. Compared with liquid-phase classification, gas-phase classification has the advantages of saving post-treatment processes such as drying, redispersion and the like, along with relatively low production cost and simple process.
In the prior art, a cyclone classifier is generally adopted as a classifying device, and the cyclone classifier is simple in structure, high in operation elasticity, convenient to maintain, low in price and widely applied to industrial production. The cyclone classifier has the working principle that the airflow is used as a carrier to drive powder to enter a cyclone body tangentially and form vortex motion, powder particles are simultaneously acted by centrifugal force and gravity, coarse powder particles with larger mass move downwards along with outer ring flow after contacting the inner wall of the cyclone body and enter an underflow collecting barrel, fine powder particles with smaller mass move upwards along with the inner ring flow in the center of the cyclone body and enter an overflow collector, and the purpose of classification is achieved.
However, since the conventional cyclone classifier only has a tangential single air inlet, after powder enters the cyclone body under the drive of air flow, the rotational flow movement speed is inevitably reduced under the influence of resistance, the centrifugal force on the powder particles is reduced, the dispersibility of the powder is further influenced, and part of undispersed particles enter fine powder collecting equipment along with the inner ring flow, so that the classification efficiency is reduced and the classification precision is deteriorated; if the classified powder material has the characteristic of easy agglomeration, the reduction of the rotating speed of the classified powder material further causes the adhesion of the powder on the inner wall of the cyclone body, the reduction of the classification area in the cyclone body, and further causes serious problems of blockage and the like. In addition, the ascending inner circulation flow in the cyclone body and the downward outer circulation flow are in reverse directions, so that the powder particles at the top of the cyclone body are in a spiral phenomenon, when the particles are excessively gathered, the particles are discharged from the exhaust pipe, and a back-mixing short-circuit flow is formed, wherein the powder particles separated at the tail end of the exhaust pipe are entrained to return to the cyclone body, so that the classification efficiency of the classifier is influenced and needs to be improved.
Disclosure of Invention
In view of the defects of the prior art, the first object of the present invention is to provide a gas-phase classification method for ultrafine powder, which has the effect of significantly improving the classification efficiency and precision.
In order to achieve the purpose, the invention provides the following technical scheme:
a gas phase classification method for superfine powder comprises the following steps:
step 3, waiting for at least 1min after grading is finished, closing the air compressor and the induced draft fan, starting a back blowing device in the back blowing tank, and finishing back blowing after the back blowing device performs back blowing for 2-4 times of circulation;
and 4, taking out the fine powder from the overflow tank, and taking out the coarse powder from the underflow tank.
By adopting the technical scheme, the powder with good dispersibility and low agglomeration degree is obtained, and the grading efficiency and effect of the powder are obviously improved.
The invention is further configured to: the grading method is operated in an environment with the humidity of less than or equal to 35% and the temperature of 15-35 ℃.
The invention is further configured to: in step 1, the induced air flow of the induced draft fan is 400-3The vacuum degree is 40-45 kPa.
The invention is further configured to: in step 2, the induced air flow of the air compressor is 380-3/h。
The invention is further configured to: in step 2, the pressure at the inlet is 0.3-0.7 MPa.
The invention is further configured to: in step 2, the feeding speed is 7-10 kg/h.
The invention is further configured to: in step 2, the grading time is 30-120 min.
A second object of the present invention is to provide an ultrafine powder gas-phase classification apparatus, comprising a feeder, a disperser, an air compressor, a classifier, a collection tank, an underflow tank, a blowback tank, an overflow tank, a first induced draft fan and a second induced draft fan, for performing the ultrafine powder gas-phase classification method according to any one of claims 1 to 7.
The invention is further configured to: the disperser is provided with an upper end inlet, a side air inlet and a lower end outlet, the upper end inlet of the disperser is connected with the feeder, the side air inlet of the disperser is connected with the air compressor, the lower outlet of the disperser is connected with the classifier, a discharge port at the lower end of the classifier is connected with the collecting tank, a fine powder outlet pipe is arranged in the classifier, the lower end of the fine powder outlet pipe penetrates out of the lower end of the classifier, and the end penetrating out is connected with the back blowing tank, the top end of the collecting tank is connected with the first induced draft fan, the top end of the back-blowing tank is connected with the second induced draft fan, the air outlets of the first induced draft fan and the second induced draft fan are communicated with each other, and is communicated with the air compressor and the grader, the underflow tank is connected with the bottom of the collecting tank, and the overflow tank is connected with the bottom of the back flushing pipe.
By adopting the technical scheme, the problems of uneven powder particle size distribution and lower classification precision and efficiency caused by the reduction of the rotational flow movement speed of the superfine powder and the back-mixing short-circuit flow in the cyclone body can be effectively solved through the arrangement of the feeding auxiliary air inlet pipeline formed after the disperser is connected with the air compressor, the double-discharging air induction pipeline formed after the disperser is respectively connected with the collecting tank and the back-flushing pipe, the first draught fan and the second draught fan are communicated with the air compressor and the classifier, the synergistic classification of the raw powder among different particle sizes can be realized after the classification precision is improved, the method can be directly suitable for the classification process of the superfine metal powder and the nonmetal powder with the average particle size of submicron to nanometer, and further effectively solves the problems of uneven powder particle size distribution caused by the reduction of the rotational flow movement speed of the superfine powder and the back-mixing short-circuit flow in the cyclone body, The grading precision and the grading efficiency are low.
The invention is further configured to: the classifier comprises a separation chamber in an inverted cone shape, a conical coarse powder chamber and a porous flange for connecting the separation chamber and the coarse powder chamber, wherein a feed port at the top end of the separation chamber is connected with the disperser, a discharge port at the lower end of the coarse powder chamber is connected with the collecting tank, the porous flange is communicated with air outlets of the first draught fan and the second draught fan, the porous flange is provided with a plurality of air inlets, and the air inlets are arranged along the circumferential direction at equal radians; the disperser comprises a feed hopper connected with the feeder and a dispersing cone arranged at the lower end of the discharge end of the feed hopper, the lower end of the dispersing cone is provided with a guide disc in an inverted cone shape, and the upper end of the fine powder outlet pipe is arranged at the lower end of the guide disc; the discharge end of the feed hopper, the axis of the dispersion cone and the axis of the guide disc are all coincided with the axis of the separation chamber.
By adopting the technical scheme, the dispersing cone and the guide disc play a role in preventing the feeding powder from generating passive agglomeration phenomenon when the pipe diameter of the feeding hole is reduced.
In conclusion, the invention has the following beneficial effects: the problems of uneven particle size distribution of powder particles and lower grading precision and grading efficiency caused by reduction of rotational flow movement speed of superfine powder and back-mixing short-circuit flow in a cyclone are effectively solved through the feeding auxiliary air inlet pipeline, the double-discharging air inducing pipeline and the air return pipeline, and after the grading precision is improved, the synergistic grading of the raw powder among different particle sizes is realized, and the method can be directly applied to the grading process of superfine metal powder and nonmetal powder with the average particle size of submicron to nanoscale.
Drawings
FIG. 1 is a schematic view of the flow structure of the present embodiment;
FIG. 2 is an SEM image of an overflow product sample of example 2 of the present invention;
fig. 3 is an SEM image of an underflow product sample of example 2 of the present invention.
Description of reference numerals: 1. a feeder; 2. a disperser; 21. a feed hopper; 22. a dispersion cone; 23. a guide plate; 3. an air compressor; 4. a classifier; 41. a separation chamber; 42. a coarse powder chamber; 43. fine powder discharging pipe; 44. an induced draft cover; 5. a porous flange; 51. an air inlet; 6. a collection tank; 7. an underflow tank; 8. a blowback tank; 9. an overflow tank; 101. a first induced draft fan; 102. a second induced draft fan; 103. evacuating the line; 11. a heat exchanger; 12. a dust remover; 13. a nitrogen source.
Detailed Description
In order to make the technical solution and advantages of the present invention more clear, the present invention will be further described in detail with reference to the accompanying drawings.
As shown in FIG. 1, an apparatus for gas phase classification of ultrafine powders comprises a disperser 2 having an upper inlet, a side inlet and a lower outlet. An inlet at the upper end of the disperser 2 is connected with a feeder 1, and the feeder 1 is a vibration blanking machine so as to feed materials into the disperser 2 through the feeder 1; an air compressor 3 is communicated with an air inlet on the side surface of the disperser 2 to blow off powder entering the disperser 2 through the feeder 1; the lower outlet of the disperser 2 is connected with a classifier 4 to effectively classify the powder entering the disperser 2.
A collection tank 6 is connected to a discharge port at the lower end of the classifier 4. The bottom of the collection tank 6 is provided with an underflow tank 7. At the same time, a fine powder discharge pipe 43 is provided in the classifier 4. The lower end of the fine powder outlet pipe 43 penetrates out from the lower end of the classifier 4, and the penetrating end is connected with a back-blowing tank 8. The bottom of the blowback tank 8 is provided with an overflow tank 9. Correspondingly, the top end of the collecting tank 6 is connected with a first induced draft fan 101, the top end of the back blowing tank 8 is connected with a second induced draft fan 102, air outlets of the first induced draft fan 101 and the second induced draft fan 102 are communicated with each other, and the first induced draft fan 101 and the second induced draft fan 102 are communicated with the air compressor 3 and the classifier 4 respectively after being sequentially connected with the heat exchanger 11 and the dust remover 12. Therefore, when the combination of the collecting tank 6 and the underflow tank 7 and the combination of the blowback tank 8 and the overflow tank 9 are matched, the uniformity, the grading precision and the grading efficiency of the particle size distribution of the powder particles are obviously improved. And after the feeding auxiliary air inlet pipeline formed after the disperser 2 is connected with the air compressor 3, the double-discharging air induction pipeline formed after the disperser 2 is respectively connected with the collecting tank 6 and the back flushing pipe, and the first draught fan 101, and the air return pipeline formed after the second draught fan 102 is communicated with the air compressor 3 and the grader 4 are arranged, the problems of uneven powder particle size distribution and lower grading precision and grading efficiency caused by the reduction of the rotational flow movement speed of the superfine powder and the back mixing short-circuit flow in the cyclone are effectively solved, the cooperative grading of the raw powder among different particle sizes is realized after the grading precision is improved, and the method can be directly suitable for the grading process of the superfine metal powder and the nonmetal powder with the average particle size of submicron to nanometer. It should be mentioned that a nitrogen source 13 is arranged between the air outlet of the dust remover 12 and the air compressor 3, so that the nitrogen source 13 can prevent the moisture and oxygen in the used medium gas from causing adverse effects on the powder in the powder classification process.
As shown in fig. 1, the classifier 4 includes a separation chamber 41 having an inverted conical shape, a coarse powder chamber 42 having a conical shape, and a porous flange 5 connecting the separation chamber 41 and the coarse powder chamber 42. The top feed inlet of separating chamber 41 is connected with disperser 2, and the lower extreme discharge gate of coarse powder chamber 42 is connected with holding vessel 6, and porous flange 5 and the air outlet intercommunication of first draught fan 101 and second draught fan 102, and then reach the purpose that effectively solves the rotational flow velocity of superfine powder and the interior back mixing short-circuit flow of whirlwind and cause powder particle size distribution inhomogeneous, classification accuracy and the lower problem of classification efficiency. Meanwhile, 12 air inlets 51 are arranged on the porous flange 5, the aperture of each air inlet 51 is 10mm, the air inlets 51 are arranged along the circumferential direction at equal radians, and the 12 air inlets 51 distributed at equal radians play roles in ensuring even feeding distribution and preventing short circuit. In order to further improve the powder classification effect, an induced draft cover 44 for sealing is provided outside the porous flange 5. The air outlets of the first induced draft fan 101 and the second induced draft fan 102 are communicated with the inner side of the induced draft cover 44, so that the induced draft cover 44 plays a role in preventing the circulating air entering the classifier 4 from being affected with damp and impurities from entering.
As shown in fig. 1, the disperser 2 includes a feed hopper 21 connected to the feeder 1 and a dispersing cone 22 provided at the lower end of the discharge end of the feed hopper 21. The lower end of the dispersion cone 22 is provided with a guide plate 23 having an inverted conical shape, and the upper end of the fine powder outlet tube 43 is provided at the lower end of the guide plate 23. Therefore, the dispersion cone 22 and the guide disc 23 play a role in preventing the fed powder from generating passive agglomeration phenomenon when the pipe diameter of the feeding port is reduced. Furthermore, the axes of the discharge end of the feed hopper 21, the dispersion cone 22 and the guide disc 23 are all set to coincide with the axis of the separation chamber 41, so as to achieve the purpose of further improving the feeding dispersion degree of the powder.
It should be mentioned that the evacuation pipelines 103 are disposed at the air outlets of the first induced draft fan 101 and the second induced draft fan 102. And vacuum pressure gauges are arranged at the discharge ports at the bottoms of the fine powder outlet pipe 43 and the coarse powder chamber 42. The vacuum pressure gauge plays a role in monitoring the vacuum degree of the pipeline and controlling the grading process.
A gas phase classification method for superfine powder comprises the following steps:
step 3, waiting for at least 1min after grading is finished, closing the air compressor 3 and the induced draft fan, starting a back flushing device in the back flushing tank 8, and finishing back flushing after the back flushing device performs back flushing for 2-4 times of circulation;
and 4, taking out the fine powder from the overflow tank 9, and taking out the coarse powder from the underflow tank 7.
It should be noted that the classification method is operated in an environment with a humidity of 35% or less and a temperature of 15-35 ℃ to obtain powder with good dispersibility and low agglomeration degree, thereby remarkably improving the classification efficiency and effect of the powder.
Example one
A gas phase classification method for superfine powder comprises the following steps:
step 3, waiting for 1min after grading is finished, closing the air compressor 3 and the induced draft fan, starting a back flushing device in the back flushing tank 8, and finishing back flushing after the back flushing device performs back flushing for 2 times of circulation;
and 4, taking out the fine powder from the overflow tank 9, and taking out the coarse powder from the underflow tank 7.
It should be noted that the classification method is operated in an environment with a humidity of 32% and a temperature of 16 ℃ to obtain powder with good dispersibility and low agglomeration degree, thereby significantly improving the classification efficiency and effect of the powder.
Example two
A gas phase classification method for superfine powder comprises the following steps:
step 3, waiting for 1min after grading is finished, closing the air compressor 3 and the induced draft fan, starting a back flushing device in the back flushing tank 8, and finishing back flushing after the back flushing device performs back flushing for 2 times of circulation;
and 4, taking out the fine powder from the overflow tank 9, and taking out the coarse powder from the underflow tank 7.
It should be noted that the classification method is operated in an environment with a humidity of 28% and a temperature of 22 ℃ to obtain powder with good dispersibility and low agglomeration degree, thereby significantly improving the classification efficiency and effect of the powder.
EXAMPLE III
A gas phase classification method for superfine powder comprises the following steps:
step 3, waiting for 2min after grading is finished, closing the air compressor 3 and the induced draft fan, starting a back flushing device in the back flushing tank 8, and finishing back flushing after the back flushing device performs back flushing for 3 times of circulation;
and 4, taking out the fine powder from the overflow tank 9, and taking out the coarse powder from the underflow tank 7.
It should be noted that the classification method is operated in an environment with a humidity of 30% and a temperature of 29 ℃ to obtain powder with good dispersibility and low agglomeration degree, thereby significantly improving the classification efficiency and effect of the powder.
Example four
A gas phase classification method for superfine powder comprises the following steps:
step 3, waiting for 2min after grading is finished, closing the air compressor 3 and the induced draft fan, starting a back flushing device in the back flushing tank 8, and finishing back flushing after the back flushing device performs back flushing for 4 cycles;
and 4, taking out the fine powder from the overflow tank 9, and taking out the coarse powder from the underflow tank 7.
It should be noted that the classification method is operated in an environment with a humidity of 35% and a temperature of 35 ℃ to obtain powder with good dispersibility and low agglomeration degree, thereby significantly improving the classification efficiency and effect of the powder.
Comparative example 1
The difference between the first comparative example and the first example is that the second induced draft fan 102 and the relevant connections are not used in the first comparative example, and air is used as the classification medium.
The following are tables of grading data for examples 1-4 and comparative example 1.
TABLE A grading data sheet for examples 1-4 and comparative example 1
As shown in Table one, since the fine powder D50 was the smallest in examples 2 to 4, it was possible to surface that the method had excellent dispersibility, a low degree of agglomeration, and an effect of effectively weakening secondary agglomeration; secondly, because the oxygen content in the comparative example 1 is higher, the surface can be treated by a heat exchanger and a dust remover, the air is used as a grading medium, a small amount of oxygen contained in the air can still partially oxidize the nickel powder product, and the powder with smaller particle size is easier to be oxidized; meanwhile, the precision of the fine powder product can be effectively improved through the arrangement of the feeding auxiliary air inlet pipeline and the double-discharging induced air pipeline, and the production significance is obvious.
As shown in fig. 2 to 3, the fine powder obtained by classification in example 2 did not have the phenomenon of particle agglomeration in the original powder, and large particles of 1 μm or more did not appear in the fine powder, and the average particle diameters of the fine powder and the coarse powder were clearly distinguished, which indicates that the gas-phase classification apparatus and the classification method thereof of the present invention have high classification accuracy.
In conclusion, the problems of uneven particle size distribution of powder particles and lower grading precision and grading efficiency caused by reduction of rotational flow movement speed of ultrafine powder and back-mixing short-circuit flow in a cyclone are effectively solved through the feeding auxiliary air inlet pipeline, the double-discharging air inducing pipeline and the air return pipeline, the synergistic grading of raw powder among different particle sizes is realized after the grading precision is improved, and the method can be directly applied to the grading process of ultrafine metal powder and nonmetal powder with the average particle size of submicron to nanoscale.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, but all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the present invention may occur to those skilled in the art without departing from the principle of the present invention, and such modifications and embellishments should also be considered as within the scope of the present invention.
Claims (10)
1. A gas phase classification method for superfine powder is characterized by comprising the following steps:
step 1, starting an induced draft fan, and controlling the vacuum degree in a fine powder outlet pipe (43) connected with the induced draft fan to be 35-45kPa until the vacuum degree is stable;
step 2, starting an air compressor (3) and a feeder (1) and carrying out powder gas-phase classification, wherein the pressure at an inlet is controlled to be 0.2-0.7MPa, the feeding speed is 5-10kg/h, and the classification time is 30-300 min;
step 3, waiting for at least 1min after grading is finished, closing the air compressor (3) and the induced draft fan, starting a back flushing device in a back flushing tank (8), and finishing back flushing after the back flushing device performs back flushing for 2-4 cycles;
and 4, taking out fine powder from the overflow tank (9), and taking out coarse powder from the underflow tank (7).
2. The gas phase classification method of ultrafine powder according to claim 1, characterized in that: the grading method is operated in an environment with the humidity of less than or equal to 35% and the temperature of 15-35 ℃.
3. The gas phase classification method of ultrafine powder according to claim 1, characterized in that: in step 1, the induced air flow of the induced draft fan is 400-3The vacuum degree is 40-45 kPa.
4. The gas phase classification method of ultrafine powder according to claim 1, characterized in that: in step 2, the induced air flow of the air compressor (3) is 380-3/h。
5. The gas phase classification method of ultrafine powder according to claim 1, characterized in that: in step 2, the pressure at the inlet is 0.3-0.7 MPa.
6. The gas phase classification method of ultrafine powder according to claim 1, characterized in that: in step 2, the feeding speed is 7-10 kg/h.
7. The gas phase classification method of ultrafine powder according to claim 1, characterized in that: in step 2, the grading time is 30-120 min.
8. A superfine powder gas-phase classification equipment is characterized in that: the method comprises a feeder (1), a disperser (2), an air compressor (3), a classifier (4), a collecting tank (6), an underflow tank (7), a blowback tank (8), an overflow tank (9) and an induced draft fan, wherein the induced draft fan is a first induced draft fan (101) and a second induced draft fan (102) so as to execute the gas phase classification method for the ultrafine powder according to any one of claims 1 to 7.
9. The gas phase classification apparatus for ultrafine powder according to claim 8, wherein: disperser (2) is provided with upper end import, side air intake and lower extreme export, the upper end import of disperser (2) with feeder (1) is connected, the side air intake of disperser (2) with air compressor machine (3) are connected, the lower extreme export of disperser (2) with grader (4) are connected, the lower extreme discharge gate of grader (4) with collecting tank (6) are connected, be provided with fine powder play powder pipe (43) in grader (4), the lower extreme of fine powder play powder pipe (43) is followed the lower extreme of grader (4) is worn out, and the one end of wearing out with blowback jar (8) is connected, the top of collecting tank (6) with first draught fan (101) is connected, the top of blowback jar (8) with second draught fan (102) are connected, first draught fan (101) with the air outlet of second draught fan (102) communicates with each other, and is communicated with the air compressor (3) and the grader (4), the underflow tank (7) is connected with the bottom of the collecting tank (6), and the overflow tank (9) is connected with the bottom of the blowback pipe.
10. The gas phase classification apparatus for ultrafine powder according to claim 9, wherein: the classifier (4) comprises a separation chamber (41) which is in an inverted cone shape, a conical coarse powder chamber (42) and a porous flange (5) which is connected with the separation chamber (41) and the coarse powder chamber (42), a top end feed inlet of the separation chamber (41) is connected with the disperser (2), a lower end discharge hole of the coarse powder chamber (42) is connected with the collecting tank (6), the porous flange (5) is communicated with air outlets of the first induced draft fan (101) and the second induced draft fan (102), the porous flange (5) is provided with a plurality of air inlets (51), and the air inlets (51) are arranged along the circumferential direction at equal radians; the disperser (2) comprises a feed hopper (21) connected with the feeder (1) and a dispersing cone (22) arranged at the lower end of the discharge end of the feed hopper (21), the lower end of the dispersing cone (22) is provided with an inverted cone-shaped guide disc (23), and the upper end of the fine powder outlet pipe (43) is arranged at the lower end of the guide disc (23); the discharge end of the feed hopper (21), the axis of the dispersion cone (22) and the guide disc (23) coincide with the axis of the separation chamber (41).
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| CN113856891A (en) * | 2021-09-16 | 2021-12-31 | 江南大学 | Efficient dry method and wet method combined powder microparticle grading device and method |
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