CN112439560B - Underflow-controllable liquid-phase classification equipment and classification method thereof - Google Patents

Underflow-controllable liquid-phase classification equipment and classification method thereof Download PDF

Info

Publication number
CN112439560B
CN112439560B CN202011398102.5A CN202011398102A CN112439560B CN 112439560 B CN112439560 B CN 112439560B CN 202011398102 A CN202011398102 A CN 202011398102A CN 112439560 B CN112439560 B CN 112439560B
Authority
CN
China
Prior art keywords
underflow
solid
treatment
liquid system
overflow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202011398102.5A
Other languages
Chinese (zh)
Other versions
CN112439560A (en
Inventor
刘晓宁
蔡建亮
周庆祺
陈昊
王海峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Guangxin Nano Mat Co ltd
Original Assignee
Ningbo Guangxin Nano Mat Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ningbo Guangxin Nano Mat Co ltd filed Critical Ningbo Guangxin Nano Mat Co ltd
Priority to CN202011398102.5A priority Critical patent/CN112439560B/en
Publication of CN112439560A publication Critical patent/CN112439560A/en
Application granted granted Critical
Publication of CN112439560B publication Critical patent/CN112439560B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • B04C5/12—Construction of the overflow ducting, e.g. diffusing or spiral exits
    • 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
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B04C5/181—Bulkheads or central bodies in the discharge opening
    • 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
    • B04C5/24—Multiple arrangement thereof
    • B04C5/28—Multiple arrangement thereof for parallel flow
    • 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
    • B04C2009/002—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with external filters
    • 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
    • B04C2009/005—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks with external rotors, e.g. impeller, ventilator, fan, blower, pump

Abstract

The invention discloses a liquid phase grading device with controllable underflow and a grading method thereof, relating to the technical field of liquid phase grading, and the technical scheme main points comprise the following steps: step 1, adding superfine metal powder into deionized water to obtain a solid-liquid system, wherein the solid content of the solid-liquid system is 5% -40%; step 2, carrying out physical dispersion treatment on the solid-liquid system, wherein the time of the physical dispersion treatment is 10-60min; step 3, guiding the solid-liquid system subjected to physical dispersion treatment into a screen mesh for sieving treatment, wherein the specification of the screen mesh is 80-600 meshes; step 4, guiding the solid-liquid system subjected to the screen mesh treatment into a cyclone group through a booster pump for grading treatment, and adjusting the pressure at a raw material inlet of the cyclone group to be 0.1-1.3MPa and the flow rate of underflow to be 0.5-10L/h; and 5, controlling the cyclone group to perform grading treatment for 30-60min, and collecting overflow to obtain fine powder slurry. The invention has the effects of reducing the cost of the whole production process and effectively improving the production efficiency.

Description

Underflow-controllable liquid-phase classification device and classification method thereof
Technical Field
The invention relates to the technical field of liquid-phase classification, in particular to liquid-phase classification equipment with controllable underflow and a classification method thereof.
Background
Classification is one of the conventional means for obtaining high-quality powder materials with different specifications in the field of material manufacturing, and the common classification methods include liquid phase classification and gas phase classification, or wet classification and dry classification. The most widely used medium in liquid phase classification includes absolute ethanol and water, which has the advantages of obtaining a product with a fine particle size, and controlling the particle size distribution range within a narrow range, so that the method is more suitable for the classification of ultrafine powder materials. The term "ultrafine powder" generally refers to a powder having a particle size of not more than 10 μm, wherein a powder having a particle size of 0.1 to 1 μm is referred to as a submicron powder, and a powder having a particle size of 1 to 100nm is referred to as a nanopowder. The ultrafine powder is classified according to the type of material, and includes various types such as metal, nonmetal, organic, inorganic, and biological. Since different kinds 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 obtain ultrafine powder materials with different particle size distributions relatively efficiently.
In the prior art, one of the options of separating materials by using a centrifugal force field and gravity settling commonly used in the field is to adopt a hydrocyclone, when the hydrocyclone is used for grading ultrafine metal powder, an overflow product with fine granularity and low density, namely fine powder, is obtained from an overflow pipe at the upper part of the hydrocyclone under an ideal condition, and an underflow product with coarse granularity and high density, namely coarse powder, is obtained from an underflow pipe (or a sand settling pipe) at the lower part of the hydrocyclone; in the actual industrial production, however, a great amount of fine powder is inevitably carried in the underflow product, and if the fine powder is not solved, a great amount of waste is caused; and because each structural parameter of the swirler is a fixed value after the manufacture is finished, the classification capability and the classification performance of the swirler cannot be adjusted in real time by adjusting the structure and configuration parameters of the swirler, so that the problem of low recovery efficiency of single-stage classification fine powder is caused.
Disclosure of Invention
In view of the disadvantages of the prior art, a first object of the present invention is to provide a liquid-phase classification method with controllable underflow, which has the effects of reducing the cost and improving the production efficiency.
In order to achieve the purpose, the invention provides the following technical scheme:
a liquid phase classification method with controllable underflow comprises the following steps:
step 1, adding superfine metal powder into deionized water to obtain a solid-liquid system, wherein the solid content of the solid-liquid system is 5% -40%;
step 2, carrying out physical dispersion treatment on the solid-liquid system, wherein the time of the physical dispersion treatment is 10-60min;
step 3, introducing the solid-liquid system subjected to physical dispersion treatment into a screen mesh for sieving treatment, wherein the specification of the screen mesh is 80-600 meshes;
step 4, introducing the solid-liquid system subjected to the screen mesh treatment into a cyclone group through a booster pump for grading treatment, and adjusting the pressure at a raw material feed inlet of the cyclone group to be 0.1-1.3MPa and the flow rate of underflow to be 0.5-10L/h;
and 5, controlling the cyclone group to perform classification treatment for 30-60min, and collecting overflow to obtain fine powder slurry.
By adopting the technical scheme, the problem that the fine powder and the coarse powder can be effectively separated only by multistage classification during liquid-phase classification of the superfine metal powder is effectively solved, and the effects of reducing the cost of the whole production process and effectively improving the production efficiency at one stage are achieved; meanwhile, by adopting water as a grading medium, the problems of high cost and loss rate of traditional organic solvents such as alcohol raw materials and great potential safety hazard can be effectively solved.
The invention is further configured to: in the step 1, the average grain diameter of the superfine metal powder is less than 1 μm, and the solid content of the solid-liquid system is 10-30%.
The invention is further configured to: in step 2, the physical dispersion treatment is mechanical stirring.
The invention is further configured to: in the step 2, the physical dispersion treatment is mechanical stirring and ultrasonic dispersion which are carried out simultaneously, and the time of the ultrasonic dispersion is 5-30min.
The invention is further configured to: in the step 2, the temperature of the solid-liquid system is 10-30 ℃, and the PH of the solid-liquid system is 7-9.
The invention is further configured to: in step 3, the sieving treatment is performed by a vibrating sieve, and the vibrating sieve is a double-layer vibrating sieve of 200 meshes and 400 meshes.
The invention is further configured to: in step 4, the pressure at the raw material feed inlet is 0.6-1.3MPa, and the flow rate of the underflow is 0.5-4L/h.
The invention provides a liquid phase classification device with controllable underflow, which comprises a cyclone group, an underflow control unit, an emulsifying kettle, a vibrating screen and a stirring kettle; to carry out a controlled underflow liquid phase fractionation process according to any one of claims 1 to 7.
By adopting the technical scheme, the emulsifying kettle, the vibrating screen and the stirring kettle are used for the classification pretreatment of raw materials, so that the liquid phase classification equipment with controllable underflow forms a stable circulating working system, and the effects of obviously reducing the production cost and improving the production efficiency are achieved.
The invention is further configured to: the cyclone group comprises a shell and at least two miniature cyclones vertically arranged in the shell, a sealed inner cavity is formed on the inner side of the shell, an overflow cavity, a feeding cavity, a middle flow cavity and a bottom flow cavity which are sequentially arranged from top to bottom are arranged in the inner cavity, and a bottom flow discharge hole communicated with the bottom flow cavity is formed in the bottom of the shell; the upper end of the micro cyclone is provided with a micro overflow port communicated with the overflow cavity and a micro feed port communicated with the feed cavity, the middle part of the micro cyclone is communicated with the underflow cavity, and the lower end of the micro cyclone is provided with a micro underflow port communicated with the underflow cavity; the underflow control unit comprises at least one control valve and is connected with an underflow discharge port of the cyclone group; the top end of the shell is provided with an upper cover plate, and the lower side of the upper cover plate is provided with an overflow baffle, a feeding baffle and an underflow baffle which are sequentially arranged from top to bottom; the overflow cavity is formed between the upper cover plate and the overflow partition plate, and the feeding cavity is formed between the overflow partition plate and the feeding partition plate; the underflow chamber is formed between the underflow partition and the feed partition, and the underflow chamber is formed between the underflow partition and the bottom of the housing.
By adopting the technical scheme, when the superfine powder is subjected to liquid-phase classification, the parallel use of a plurality of micro cyclones effectively controls the underflow flow to obviously improve the yield of the fine powder in overflow on the premise of reducing the classification times, so that the production efficiency is directly improved, the production cost of equipment, manpower and the like is saved, the superfine powder can be used in different medium environments such as water, organic solvents and the like, and the market prospect is wide; meanwhile, stable structures of an overflow cavity, a feeding cavity, a middle flow cavity and a bottom flow cavity are formed in the shell, so that the effects of improving the production efficiency and saving the production cost of equipment, manpower and the like are achieved.
The invention is further configured to: the upper cover plate is provided with the overflow discharge gate, the side of casing is provided with raw materials feed inlet and well discharge gate, the raw materials feed inlet with feeding chamber intercommunication, well flow discharge gate with well flow chamber intercommunication, the exit end of control valve is connected with the peristaltic pump, stirred tank's bottom discharge gate with raw materials feed inlet intercommunication, well flow discharge gate and the peristaltic pump all with stirred tank's top feed inlet intercommunication.
Through adopting above-mentioned technical scheme, form stable flow chamber in the casing, and then when showing reduction in production cost, realize improving production efficiency's effect.
In conclusion, the invention has the following beneficial effects: the parallel use of a plurality of micro cyclones and the control of the underflow flow rate realize the improvement of the yield of fine powder in overflow on the premise of reducing the grading times, obviously improve the production efficiency, save the production cost of equipment, manpower and the like, can be used in different medium environments such as water, organic solvent and the like, and has wide application prospect.
Drawings
FIG. 1 is a schematic view of the flow structure of the present invention;
FIG. 2 is a schematic structural view of the swirler assembly of the present invention;
FIG. 3 is an SEM image of an overflow product sampling of one embodiment of the present invention;
FIG. 4 is an SEM image of an overflow product sample of comparative example one of the present invention.
Description of reference numerals: 1. a cyclone group; 11. an upper cover plate; 12. a housing; 121. a raw material inlet; 122. a medium flow discharge port; 123. a bottom flow discharge hole; 13. an overflow baffle; 14. a feed spacer; 15. an underflow partition plate; 16. a micro swirler; 161. an upper section of the cyclone; 162. the lower section of the cyclone; 163. a micro overflow port; 164. a micro feed port; 165. a micro underflow port; 2. a bottom flow control unit; 21. a control valve; 22. a buffer tank; 23. a peristaltic pump; 24. a pressure gauge; 3. an emulsifying kettle; 4. vibrating screen; 5. and (5) stirring the mixture in a kettle.
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 and 2, a liquid phase classification device with controllable underflow comprises a cyclone group 1 and an underflow control unit 2. The cyclone group 1 comprises a casing 12 and at least two mini-cyclones 16 arranged vertically in the casing 12. A sealed inner cavity is formed on the inner side of the shell 12, and an overflow cavity, a feeding cavity, a middle flow cavity and a bottom flow cavity are arranged in the inner cavity from top to bottom in sequence. It should be noted that the top end of the shell 12 is provided with an upper cover plate 11, and an overflow baffle plate 13, a feed baffle plate 14 and an underflow baffle plate 15 are arranged on the lower side of the upper cover plate 11 in sequence from top to bottom. Thus, an overflow chamber is formed between the upper cover plate 11 and the overflow barrier 13, and a feed chamber is formed between the overflow barrier 13 and the feed barrier 14; the underflow chamber is formed between the underflow partition plate 15 and the feed partition plate 14, and the underflow chamber is formed between the underflow partition plate 15 and the bottom of the housing 12, so as to form stable structures of an overflow chamber, a feed chamber, a underflow chamber and an underflow chamber in the housing 12, thereby achieving the effects of improving the production efficiency and saving the production cost of equipment, manpower and the like. At the same time, an underflow discharge opening 123 is provided in the bottom of the housing 12 in communication with the underflow chamber. The upper end of the mini cyclone 16 is provided with a mini overflow 163 communicating with the overflow chamber and a mini feed 164 communicating with the feed chamber. The middle part of the micro cyclone 16 is communicated with the middle flow cavity, and the lower end of the micro cyclone 16 is provided with a micro underflow port 165 communicated with the underflow cavity. Therein, the mini cyclone 16 comprises an upper cyclone section 161 and a lower cyclone section 162 connected to each other. The micro overflow port 163 is located at the top end of the cyclone upper section 161, the micro feed port 164 is located at the side surface of the cyclone upper section 161, the junction of the cyclone upper section 161 and the cyclone lower section 162 is communicated with the middle flow cavity, and the micro underflow port 165 is located at the bottom of the cyclone lower section 162, so that the micro cyclone 16 and the inner cavity in the casing 12 form a stable matching structure, and the effects of improving the production efficiency, saving the production cost of equipment, manpower and the like are achieved. Correspondingly, the underflow control unit 2 comprises at least one control valve 21 and is connected to the underflow discharge 123 of the cyclone group 1. Therefore, when the liquid-phase classification device with controllable underflow is used for liquid-phase classification of ultrafine powder, the flow of the underflow is effectively controlled by using the plurality of micro cyclones 16 in parallel, so that the yield of the fine powder in overflow is remarkably improved on the premise of reducing the classification times, the production efficiency is directly improved, the production cost of equipment, manpower and the like is saved, the device can be used in different medium environments such as water, organic solvents and the like, and the market prospect is wide.
It should be noted that the upper cover plate 11 is provided with an overflow discharge hole. The side of the housing 12 is provided with a raw material feed opening 121 and a middle effluent opening 122. Raw materials feed inlet 121 and feeding chamber intercommunication, well flow discharge gate 122 and well flow chamber intercommunication to form stable mobile cavity in casing 12, and then when showing reduction in production cost, realize improving production efficiency's effect. Meanwhile, a buffer tank 22, a pressure gauge 24 and a peristaltic pump 23 are also provided in the underflow control unit 2. Wherein, two ends of the buffer tank 22 are respectively connected with the underflow discharge port 123 and the control valve 21 to play a role in stabilizing pressure; the pressure gauge 24 is arranged between the control valve 21 and the buffer tank 22 and used for monitoring the pressure of the underflow pipe so as to achieve the purpose of preventing the damage to equipment caused by overhigh system pressure; the peristaltic pump 23 is connected with the outlet end of the control valve 21 and plays a role in effectively preventing the ultrafine powder from being deposited and blocked in the pump body of the peristaltic pump 23.
As shown in fig. 1 and fig. 2, the liquid-phase classification apparatus with controllable underflow further comprises an emulsifying tank 3, a vibrating screen 4 and a stirring tank 5 which are connected in sequence. The bottom discharge port of the stirring kettle 5 is communicated with the raw material feed port 121, and the middle flow discharge port 122 and the peristaltic pump 23 are both communicated with the top feed port of the stirring kettle 5. Therefore, the emulsification kettle 3, the vibrating screen 4 and the stirring kettle 5 are used for the classification pretreatment of raw materials, so that the liquid phase classification equipment with controllable underflow forms a stable circulating working system, and the effects of obviously reducing the production cost and improving the production efficiency are achieved. In order to further improve the grading effect of the liquid-phase grading equipment with controllable underflow on the powder, the micro feed inlet 164 is in an involute shape or a tangent shape, so that the effect of effectively reducing the resistance of raw material feeding is achieved, and the raw material feeding speed and the grading precision are improved. The number of the micro cyclones 16 is even, and the distance between two adjacent micro cyclones 16 is larger than the diameter of each micro cyclone 16, so that the working efficiency and the effect of the micro cyclones 16 are effectively improved.
A liquid-phase classification method with controllable underflow comprises the following steps:
step 1, adding superfine metal powder into deionized water to obtain a solid-liquid system, wherein the solid content of the solid-liquid system is 5% -40%;
step 2, carrying out physical dispersion treatment on the solid-liquid system, wherein the time of the physical dispersion treatment is 10-60min, the temperature of the solid-liquid system is 10-30 ℃, and the PH of the solid-liquid system is 7-9;
step 3, guiding the solid-liquid system subjected to physical dispersion treatment into a screen mesh for sieving treatment, wherein the specification of the screen mesh is 80-600 meshes;
step 4, guiding the solid-liquid system subjected to the screen mesh treatment into the cyclone group 1 through a booster pump for grading treatment, and adjusting the pressure at the raw material feed inlet 121 of the cyclone group 1 to be 0.1-1.3MPa and the flow rate of underflow to be 0.5-10L/h;
and 5, controlling the cyclone group 1 to perform classification treatment for 30-60min, and collecting overflow to obtain fine powder slurry.
The average particle size of the ultrafine metal powder is less than 1 μm, the sieving treatment is performed by a vibrating sieve 4, and the vibrating sieve 4 is a double-layer vibrating sieve 4 of 200 meshes and 400 meshes.
Therefore, when the method is used for liquid-phase classification, the problem that the fine powder and the coarse powder can be effectively separated only by multi-stage classification during the liquid-phase classification of the superfine metal powder is effectively solved, and the effects of reducing the cost of the whole production process and effectively improving the production efficiency at one stage are achieved; meanwhile, by adopting water as a grading medium, the problems of high cost and loss rate of traditional organic solvents such as alcohol raw materials and great potential safety hazard can be effectively solved.
In the following examples, nickel powder prepared by PVD (Physical Vapor Deposition) method was used as the ultrafine metal powder. Of course, copper powder and other materials may also be selected, and will not be described in detail in the embodiments of the present invention.
Example one
Step 1, adding superfine metal powder into deionized water to obtain a solid-liquid system, wherein the solid content of the solid-liquid system is 10%;
step 2, carrying out physical dispersion treatment on the solid-liquid system, wherein the time of the physical dispersion treatment is 10min, the temperature of the solid-liquid system is 10 ℃, and the PH of the solid-liquid system is 7.92;
step 3, guiding the solid-liquid system subjected to physical dispersion treatment into a screen mesh for sieving treatment;
step 4, introducing the solid-liquid system subjected to the screen mesh treatment into the cyclone group 1 through a booster pump for grading treatment, and adjusting the pressure at the raw material feed inlet 121 of the cyclone group 1 to be 0.6MPa and the flow rate of underflow to be 0.5L/h;
and 5, controlling the cyclone group 1 to carry out classification treatment for 30min, and collecting overflow to obtain fine powder slurry.
The average particle size of the ultrafine metal powder is less than 1 μm, the sieving treatment is performed by a vibrating sieve 4, and the vibrating sieve 4 is a double-layer vibrating sieve 4 of 200 meshes and 400 meshes.
Example two
Step 1, adding superfine metal powder into deionized water to obtain a solid-liquid system, wherein the solid content of the solid-liquid system is 20%;
step 2, carrying out physical dispersion treatment on the solid-liquid system, wherein the time of the physical dispersion treatment is 35min, the temperature of the solid-liquid system is 20 ℃, and the PH of the solid-liquid system is 7.16;
step 3, introducing the solid-liquid system subjected to physical dispersion treatment into a screen mesh for sieving treatment;
step 4, introducing the solid-liquid system subjected to the screen mesh treatment into the cyclone group 1 through a booster pump for grading treatment, and adjusting the pressure at the raw material feed inlet 121 of the cyclone group 1 to be 1.0MPa and the flow rate of underflow to be 2L/h;
and 5, controlling the cyclone group 1 to perform classification treatment for 45min, and collecting overflow to obtain fine powder slurry.
The average particle size of the ultrafine metal powder is less than 1 μm, the sieving treatment is performed by a vibrating sieve 4, and the vibrating sieve 4 is a double-layer vibrating sieve 4 of 200 meshes and 400 meshes.
EXAMPLE III
Step 1, adding superfine metal powder into deionized water to obtain a solid-liquid system, wherein the solid content of the solid-liquid system is 30%;
step 2, carrying out physical dispersion treatment on the solid-liquid system, wherein the time of the physical dispersion treatment is 60min, the temperature of the solid-liquid system is 30 ℃, and the PH of the solid-liquid system is 8.73;
step 3, guiding the solid-liquid system subjected to physical dispersion treatment into a screen mesh for sieving treatment;
step 4, introducing the solid-liquid system subjected to the screen mesh treatment into the cyclone group 1 through a booster pump for grading treatment, and adjusting the pressure at the raw material feed inlet 121 of the cyclone group 1 to be 1.3MPa and the flow rate of underflow to be 4L/h;
and 5, controlling the cyclone group 1 to perform classification treatment for 60min, and collecting overflow to obtain fine powder slurry.
The average particle size of the ultrafine metal powder is less than 1 μm, the sieving treatment is performed by a vibrating screen 4, and the vibrating screen 4 is a double-layer vibrating screen 4 of 200 mesh and 400 mesh.
Example four
A liquid phase classification method with controllable underflow comprises the following steps:
step 1, adding superfine metal powder into deionized water to obtain a solid-liquid system, wherein the solid content of the solid-liquid system is 40%;
step 2, carrying out physical dispersion treatment on the solid-liquid system, wherein the time of the physical dispersion treatment is 30min, the temperature of the solid-liquid system is 25 ℃, and the PH of the solid-liquid system is 7.65;
step 3, guiding the solid-liquid system subjected to physical dispersion treatment into a screen mesh for sieving treatment;
step 4, guiding the solid-liquid system subjected to the screen mesh treatment into the cyclone group 1 through a booster pump for grading treatment, and adjusting the pressure at the raw material feed inlet 121 of the cyclone group 1 to be 0.2MPa and the flow rate of underflow to be 10L/h;
and 5, controlling the cyclone group 1 to perform classification treatment for 50min, and collecting overflow to obtain fine powder slurry.
The average particle size of the ultrafine metal powder is less than 1 μm, the sieving treatment is performed by a vibrating screen 4, and the vibrating screen 4 is a double-layer vibrating screen 4 of 200 mesh and 400 mesh.
EXAMPLE five
A liquid phase classification method with controllable underflow comprises the following steps:
step 1, adding superfine metal powder into deionized water to obtain a solid-liquid system, wherein the solid content of the solid-liquid system is 5%;
step 2, carrying out physical dispersion treatment on the solid-liquid system, wherein the time of the physical dispersion treatment is 30min, the temperature of the solid-liquid system is 25 ℃, and the PH of the solid-liquid system is 8.21;
step 3, introducing the solid-liquid system subjected to physical dispersion treatment into a screen mesh for sieving treatment;
step 4, introducing the solid-liquid system subjected to the screen mesh treatment into the cyclone group 1 through a booster pump for grading treatment, and adjusting the pressure at the raw material feed inlet 121 of the cyclone group 1 to be 0.1MPa and the flow rate of underflow to be 10L/h;
and 5, controlling the cyclone group 1 to carry out classification treatment for 40min, and collecting overflow to obtain fine powder slurry.
The average particle size of the ultrafine metal powder is less than 1 μm, the sieving treatment is performed by a vibrating sieve 4, and the vibrating sieve 4 is a double-layer vibrating sieve 4 of 200 meshes and 400 meshes.
EXAMPLE six
The difference between example six and example one is that in step 2 of example six, the physical dispersion treatment was mechanical stirring and ultrasonic dispersion carried out simultaneously, and the time for ultrasonic dispersion was 5min.
EXAMPLE seven
The seventh example is different from the first example in that the physical dispersion treatment in step 2 of the seventh example is mechanical stirring and ultrasonic dispersion performed simultaneously, and the time for ultrasonic dispersion is 20min.
Example eight
Example eight differs from example one in that in step 2 of example eight, the physical dispersion treatment was simultaneous mechanical stirring and ultrasonic dispersion, and the time for ultrasonic dispersion was 30min.
Comparative example 1
Comparative example one differs from example one in that comparative example one does not control the flow rate of the underflow.
The following is a table of grading data for examples 1-8 and comparative example 1.
TABLE A grading data sheet for examples 1-8 and comparative example 1
Figure 564266DEST_PATH_IMAGE002
As shown in table one, fig. 3 and fig. 4, the overflow fine powder product obtained by the apparatus and method of the present invention is substantially equal to the existing product performance, and because the present invention controls the underflow flow, the performance requirement of the average particle size of the overflow fine powder product is ensured, and at the same time, the production efficiency and the yield of the product are significantly improved, and the present invention has significant economic benefits.
In conclusion, the present application realizes the improvement of the yield of fine powder in overflow on the premise of reducing the classification times by the parallel use of the plurality of micro cyclones 16 and the control of the underflow flow, remarkably improves the production efficiency, saves the production cost of equipment, manpower, etc., can be used in different medium environments such as water and organic solvents, etc., and has a wide application prospect.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but all technical solutions that fall under the spirit of the present invention belong to the scope of the present invention. It should be noted that modifications and embellishments within the scope of the present invention may occur to those of ordinary skill in the art without departing from the spirit of the present invention.

Claims (4)

1. A liquid phase classification method with controllable underflow is characterized by comprising the following steps:
step 1, adding superfine metal powder into deionized water to obtain a solid-liquid system, wherein the solid content of the solid-liquid system is 5-40%;
step 2, carrying out physical dispersion treatment on a solid-liquid system, wherein the temperature of the solid-liquid system is 10-30 ℃, the PH of the solid-liquid system is 7-9, the time of the physical dispersion treatment is 10-60min, the physical dispersion treatment is mechanical stirring and ultrasonic dispersion which are carried out simultaneously, and the time of the ultrasonic dispersion is 5-30min;
step 3, introducing the solid-liquid system subjected to physical dispersion treatment into a screen mesh for sieving treatment, wherein the sieving treatment is carried out by a vibrating screen (4), and the vibrating screen (4) is a double-layer vibrating screen of 200 meshes and 400 meshes;
step 4, introducing the solid-liquid system subjected to the screen mesh treatment into a cyclone group (1) through a booster pump for grading treatment, and adjusting the pressure at a raw material feed inlet (121) of the cyclone group (1) to be 0.1-1.3MPa and the flow rate of underflow to be 0.5-10L/h;
step 5, controlling the cyclone group (1) to carry out classification treatment for 30-60min, and collecting overflow to obtain fine powder slurry;
the equipment for implementing the liquid phase classification method with controllable underflow comprises a cyclone group (1), an underflow control unit (2), an emulsifying kettle (3), a vibrating screen (4) and a stirring kettle (5); the cyclone unit (1) comprises a shell (12) and at least two miniature cyclones (16) vertically arranged in the shell (12), wherein a sealed inner cavity is formed on the inner side of the shell (12), an overflow cavity, a feeding cavity, a middle flow cavity and a bottom flow cavity which are sequentially arranged from top to bottom are arranged in the inner cavity, and a bottom flow discharge hole (123) communicated with the bottom flow cavity is formed in the bottom of the shell (12); the upper end of the micro cyclone (16) is provided with a micro overflow port (163) communicated with the overflow cavity and a micro feed port (164) communicated with the feed cavity, the middle part of the micro cyclone (16) is communicated with the intermediate flow cavity, and the lower end of the micro cyclone (16) is provided with a micro underflow port (165) communicated with the underflow cavity; the underflow control unit (2) comprises a buffer tank (22), a pressure gauge (24) and at least one control valve (21), and is connected with an underflow discharge hole (123) of the cyclone group (1); two ends of the buffer tank (22) are respectively connected with the underflow discharge port (123) and the control valve (21); the pressure gauge (24) is arranged between the control valve (21) and the buffer tank (22), the top end of the shell (12) is provided with an upper cover plate (11), and the lower side of the upper cover plate (11) is provided with an overflow baffle plate (13), a feeding baffle plate (14) and an underflow baffle plate (15) which are sequentially arranged from top to bottom; the overflow cavity is formed between the upper cover plate (11) and the overflow partition plate (13), and the feeding cavity is formed between the overflow partition plate (13) and the feeding partition plate (14); the underflow chamber being formed between the feed partition (14) and the underflow partition (15), the underflow chamber being formed between the underflow partition (15) and the bottom of the housing (12); upper cover plate (11) are provided with the overflow discharge gate, the side of casing (12) is provided with raw materials feed inlet (121) and well discharge gate (122), raw materials feed inlet (121) with feeding chamber intercommunication, well class discharge gate (122) with well class chamber intercommunication, the exit end of control valve (21) is connected with peristaltic pump (23), the bottom discharge mouth of stirred tank (5) with raw materials feed inlet (121) intercommunication, well class discharge gate (122) and peristaltic pump (23) all with the top feed inlet intercommunication of stirred tank (5).
2. A liquid phase fractionation process with controlled underflow according to claim 1 wherein: in the step 1, the average grain diameter of the superfine metal powder is less than 1 μm, and the solid content of the solid-liquid system is 10-30%.
3. A liquid phase fractionation process with controlled underflow according to claim 1 wherein: in step 2, the physical dispersion treatment is mechanical stirring.
4. A liquid phase fractionation process with controlled underflow according to claim 1 wherein: in step 4, the pressure at the feed inlet (121) of the raw materials is 0.6-1.3MPa, and the flow rate of the underflow is 0.5-4L/h.
CN202011398102.5A 2020-12-03 2020-12-03 Underflow-controllable liquid-phase classification equipment and classification method thereof Active CN112439560B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011398102.5A CN112439560B (en) 2020-12-03 2020-12-03 Underflow-controllable liquid-phase classification equipment and classification method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011398102.5A CN112439560B (en) 2020-12-03 2020-12-03 Underflow-controllable liquid-phase classification equipment and classification method thereof

Publications (2)

Publication Number Publication Date
CN112439560A CN112439560A (en) 2021-03-05
CN112439560B true CN112439560B (en) 2022-10-25

Family

ID=74740313

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011398102.5A Active CN112439560B (en) 2020-12-03 2020-12-03 Underflow-controllable liquid-phase classification equipment and classification method thereof

Country Status (1)

Country Link
CN (1) CN112439560B (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006275300A (en) * 2005-03-28 2006-10-12 Wako:Kk Water containing object drying device
CN102989576B (en) * 2012-11-07 2015-04-08 宁波广博纳米新材料股份有限公司 Method for grading silver powder for solar battery
CN203944481U (en) * 2014-05-12 2014-11-19 江南大学 The micro-a cluster cyclone locking device of a kind of multitube
CN206325720U (en) * 2016-11-10 2017-07-14 北京金诚信矿山技术研究院有限公司 A kind of tailings cyclone classification experimental system

Also Published As

Publication number Publication date
CN112439560A (en) 2021-03-05

Similar Documents

Publication Publication Date Title
CN212092759U (en) Aluminum paste deironing magnetic separation device
CN112439560B (en) Underflow-controllable liquid-phase classification equipment and classification method thereof
CN102327806A (en) Method taking organic solvent as medium for grading nano-nickel powder for MLCC (multilayer ceramic capacitor)
CN203778347U (en) Pneumatic sand screening and powder removing equipment in manual mechanical sand-making
CN109876531A (en) A kind of balancing earth-pressure shielding machine dregs separation equipment and method
CN103657170A (en) Pressurized filtering device
CN112403695A (en) Multistage combined type hydraulic cyclone classification method for micron-sized noble metal powder
CN105457392A (en) Magnetorheological fluid multi-stage treatment device and control method and component manufacturing method thereof
CN115415518B (en) Purification system and purification method of metal nanowire
CN1785529A (en) Technological method of iron removal of nepheline ore by strong magnetic concentration
CN205252707U (en) Magnetorheological suspensions multilevel processing device
CN115121362A (en) Production line and process method for extracting and separating mica and weak magnetic substances from tailings
CN112439561A (en) Controllable liquid phase classification equipment of underflow
CN110923447B (en) Multistage countercurrent continuous washing method for superfine leaching residues
CN105944421A (en) Filtering device for oil paint
CN213349314U (en) Mica grading system
CN214319186U (en) Homogeneity extraction equipment
CN201249138Y (en) Hydraulic cyclone classifier
CN113546474B (en) Separation material for separating emulsified polytetrafluoroethylene system and device thereof
CN214972080U (en) Filter equipment in silver thick liquid production
CN218872453U (en) Dry classification powder making equipment for ceramic body powder
CN215507655U (en) Sand and stone separator
CN220547083U (en) Silver powder flow state wet classification system
CN216538827U (en) Device for airflow depolymerization and fine classification of fine silver powder
CN220574738U (en) Atomization pulverizing device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant