CN112792045A - Device and method for cleaning nano material - Google Patents
Device and method for cleaning nano material Download PDFInfo
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- CN112792045A CN112792045A CN202110153186.4A CN202110153186A CN112792045A CN 112792045 A CN112792045 A CN 112792045A CN 202110153186 A CN202110153186 A CN 202110153186A CN 112792045 A CN112792045 A CN 112792045A
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- filter screen
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- 238000004140 cleaning Methods 0.000 title claims abstract description 82
- 239000002086 nanomaterial Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims description 19
- 238000003756 stirring Methods 0.000 claims abstract description 107
- 239000007788 liquid Substances 0.000 claims abstract description 103
- 239000006185 dispersion Substances 0.000 claims abstract description 47
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 239000007921 spray Substances 0.000 claims abstract description 19
- 238000001914 filtration Methods 0.000 claims abstract description 11
- 239000011229 interlayer Substances 0.000 claims abstract description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 32
- 239000010935 stainless steel Substances 0.000 claims description 32
- 239000002002 slurry Substances 0.000 claims description 19
- 239000012065 filter cake Substances 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 10
- 230000001133 acceleration Effects 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000010907 mechanical stirring Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000151 deposition Methods 0.000 claims description 2
- 239000002360 explosive Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 11
- 238000013461 design Methods 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 229910052742 iron Inorganic materials 0.000 description 13
- 239000008367 deionised water Substances 0.000 description 11
- 229910021641 deionized water Inorganic materials 0.000 description 11
- 239000000243 solution Substances 0.000 description 11
- 238000003786 synthesis reaction Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000010963 304 stainless steel Substances 0.000 description 4
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 239000002585 base Substances 0.000 description 3
- 229910003460 diamond Inorganic materials 0.000 description 3
- 239000010432 diamond Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
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- 238000001556 precipitation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 238000000967 suction filtration Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
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- 238000011086 high cleaning Methods 0.000 description 1
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- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
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- 229910052708 sodium Inorganic materials 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/31—Self-supporting filtering elements
- B01D29/35—Self-supporting filtering elements arranged for outward flow filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/102—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration with means for agitating the liquid
Abstract
The invention provides a device for cleaning nano materials, which comprises a kettle shell, an inner kettle body, a filter screen, a high-pressure air gun, a high-pressure liquid spray gun and a stirring mechanism, wherein the inner kettle body is arranged in the kettle shell; the kettle shell is arranged outside the inner kettle body, the filter screen is fixed on the inner kettle body or the kettle shell, and the filter screen divides the inner space of the inner kettle body and the interlayer space of the inner kettle body and the kettle shell into an upper stirring dispersion cavity and a lower filtering cavity; the stirring mechanism comprises a stirring motor, a stirring shaft and stirring blades; the high-pressure air injection gun and the high-pressure liquid injection gun are both arranged on the kettle cover of the inner kettle body; a feed inlet and an exhaust port which are communicated with the stirring dispersion cavity and can be sealed and closed are arranged on the kettle cover; and a liquid outlet which is communicated with the filter cavity and can be sealed and closed is arranged at the bottom of the kettle shell. The device integrates the dispersing and separating steps into one device, reduces the transfer of materials, increases the enhanced design of stirring and filtering, and improves the cleaning efficiency.
Description
Technical Field
The invention relates to a cleaning technology of a nano material, in particular to a device for cleaning the nano material and a cleaning method.
Background
The application field of the nano material is quite wide, such as: energy, chemical, medical, environmental, and biological engineering, etc. The synthesis of the nano-material is generally performed by a bottom-up precipitation method, a solvothermal method, a hydrothermal method and the like, and the controllable preparation of the nano-material structure is ensured by controlling synthesis parameters or adding an auxiliary agent.
Various auxiliaries, impurities, reaction solvents or precipitant cations (sodium ions, potassium ions and the like) are generally adhered to the surface of the obtained nano material, and can be removed through repeated cleaning.
The current common cleaning method for the nano material is mainly divided into two steps from the technical process: the first step is the full dispersion of the nano material in the cleaning solution; the second step is the solid-liquid separation of the nanometer material and the cleaning liquid; the pure nanometer material can be finally obtained by repeatedly circulating the two steps.
The first step is completed, the nano material is uniformly dispersed in the cleaning liquid by generally adopting a mechanical stirring or ultrasonic mode, and the second step is completed, and the solid-liquid separation of the nano material and the cleaning liquid is realized by adopting a filter pressing, suction filtration and centrifugal separation mode.
Usually, the two steps of operations are completed by different devices, and the nano material needs to be repeatedly conveyed back and forth between the two sets of devices by manpower in the cleaning process, so that the time and the labor are consumed, the cleaning efficiency is low, and the industrial mass production of the nano material is not facilitated.
Patent CN209715889U discloses a thick liquids belt cleaning device for nano-material synthesis thick liquids, adopts the mode of gravity subsides, directly pours the material that is washd on the filter cloth, through natural sedimentation, realizes the solid-liquid separation of material and washing liquid.
Because the nanometer materials have smaller sizes (at least one dimension is in the nanometer size), most of the nanometer materials are usually difficult to separate in a cleaning solution in a suspending way, the natural gravity settling mode is long in time consumption and low in efficiency, and the method is not practical in industrial mass production of the nanometer materials, so that the solid-liquid separation of the nanometer materials is more in a filter pressing, suction filtration or centrifugation mode.
Patent CN210995569U discloses a cleaning device for processing diamond powder, which utilizes the huge density difference and particle size difference between diamond powder and water molecules to effectively separate diamond powder and water through a filter screen cylinder.
However, it is difficult to naturally separate the nano material from the cleaning solution by using the device based on the ultra-fine particle size of the nano material.
In conclusion, the dispersing step and the solid-liquid separation step of the nano material cleaning are low in efficiency by adopting the currently known mechanical stirring and natural sedimentation mode, and the mode of combining density difference with a filter screen is not suitable for the particle size of the nano material.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a device for cleaning nano materials, which has high integration level, reduced material transfer times and high cleaning efficiency, and a cleaning method.
In order to achieve the purpose, the invention adopts the technical scheme that: a device for cleaning nano materials comprises a kettle shell, an inner kettle body, a filter screen, a high-pressure air gun, a high-pressure liquid spray gun and a stirring mechanism;
the kettle shell is arranged outside the inner kettle body, the filter screen is fixed on the inner kettle body or the kettle shell, and the filter screen divides the inner space of the inner kettle body and the interlayer space of the inner kettle body and the kettle shell into an upper stirring dispersion cavity and a lower filtering cavity;
the stirring mechanism comprises a stirring motor, a stirring shaft and stirring blades;
the high-pressure air gun and the high-pressure liquid spray gun are both arranged on the cover of the inner kettle body, and the outlets of the high-pressure air gun and the high-pressure liquid spray gun are positioned in the stirring dispersion cavity;
a feed inlet and an exhaust port which are communicated with the stirring dispersion cavity and can be sealed and closed are arranged on the cover of the inner kettle body;
and a liquid outlet which is communicated with the filter cavity and can be sealed and closed is arranged at the bottom of the kettle shell.
Basically, a plurality of ultrasonic generators are uniformly arranged in the stirring dispersion cavity.
Basically, the (mixing) shaft is vertical to be set up, agitator motor installs in interior cauldron body lid upper end, agitator blade's rotation is upper and lower direction, agitator blade is hinge structure or helical surface leaf structure.
Basically, the filter screen comprises an inner support frame, a stainless steel filter screen and an outer support frame which are detachably connected together, the stainless steel filter screen is arranged in an interlayer of the inner support frame and the outer support frame, and the outer support frame and the inner support frame are respectively detachably connected with the kettle shell or the inner kettle body; the whole bag form that is of filter screen, cauldron shell bottom is corresponding bag form, the leakage fluid dram is located the minimum of filter chamber.
Basically, the high-pressure gas spray gun and the high-pressure liquid spray gun are both annularly arranged at the top end of the inner kettle body cover, and the spray angle of the high-pressure liquid spray gun can be adjusted so as to align to the stainless steel filter screen to realize the stripping of the filter cake; the angle of the high-pressure gas spray gun can be adjusted to form a cyclone in the stirring dispersion cavity.
Basically, the opening at the top of the kettle shell is a polygonal opening, and the cross section of the inner kettle body is in a polygonal shape matched with the shape of the opening.
Basically, the top end of the inner kettle body cover is provided with a handle.
Basically, pressure sensors are arranged in the stirring dispersion cavity and the filter cavity.
A nanomaterial cleaning method for an apparatus for nanomaterial cleaning, comprising the steps of:
s1, opening a feed inlet and an exhaust port, closing a liquid discharge port, closing the feed inlet after a to-be-cleaned nano material enters a stirring dispersion cavity through the feed inlet, and spraying cleaning liquid into the stirring dispersion cavity through a high-pressure liquid spraying gun until the volume of slurry accounts for 60-70% of the volume of the stirring dispersion cavity;
s2, starting a stirring mechanism to stir the nano material and the cleaning liquid, enabling the stirring blade to rotate upwards to provide an upward component acceleration, starting an ultrasonic generator to prevent the nano material from depositing on the stainless steel filter screen, and enabling the nano material to be fully dispersed in the cleaning liquid;
s3, after the nano materials are fully dispersed to cleaning liquid through stirring and are stabilized for a certain time, opening a liquid discharge port, closing an exhaust port, adjusting a stirring motor to rotate reversely, enabling a stirring blade to rotate downwards to provide downward component acceleration, opening a high-pressure air gun to supply air to a stirring dispersion cavity, adjusting the rotating speed of the stirring motor and the air flow of the high-pressure air gun, keeping an ultrasonic generator on, filtering nano slurry in the stirring dispersion cavity through a stainless steel filter screen under the assistance of ultrasonic waves through air pressure filter pressing and mechanical stirring action, discharging the cleaning liquid from the liquid discharge port after the cleaning liquid enters a filter cavity, and leaving a filter cake on the stainless steel filter screen;
s4, when no cleaning liquid is discharged from the liquid discharge port, closing the high-pressure air gun, opening the air exhaust port, closing the liquid discharge port, adjusting the stirring motor to rotate in the forward direction, enabling the stirring blade to rotate upwards, simultaneously starting the high-pressure liquid injection gun to inject the cleaning liquid, keeping the ultrasonic generator started, enabling the nano filter cake to be dispersed in the cleaning liquid again under the combined action of mechanical driving and ultrasonic waves of the stirring blade, enabling the size of slurry in the to-be-stirred dispersion cavity to account for 60% -70% of the volume of the stirring dispersion cavity, closing the high-pressure liquid injection gun, stopping inputting of the cleaning liquid, and continuing stirring to ensure that the nano material is fully dispersed into the cleaning liquid and is stable;
s5, circularly repeating the step S3 and the step S4 until the nano material is cleaned, opening a feed inlet, extracting the nano slurry, and performing solid-liquid separation on the nano slurry by adopting plate-and-frame filter pressing or other filter pressing modes to obtain a clean filter cake; and cleaning the next batch of samples after the device is cleaned.
Basically, the cleaning liquid used for the nano materials in the steps S1-S5 is a liquid which is nonflammable, non-explosive, non-corrosive to the device parts and non-reactive with the cleaned nano materials; in steps S1-S5, the cleaning process of the nano material in the device is a normal temperature operation.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and particularly integrates the steps of dispersing the nano material in the cleaning solution and separating the solid and the liquid of the nano material dispersion liquid into one set of equipment, thereby avoiding the transfer of the nano material among different equipment, reducing the labor amount, reducing the loss and improving the efficiency.
Furthermore, by utilizing the rotation direction design of the stirring blades, upward thrust is provided in the dispersion stage, the back mixing efficiency of the nano material in the cleaning solution is enhanced, and the dispersion of the nano material in the cleaning solution is promoted; in the solid-liquid separation stage, the stirring blades are controlled to rotate reversely to provide downward thrust, and high-pressure gas is assisted to filter and press the slurry, so that the solid-liquid separation efficiency is improved.
Furthermore, the high-pressure air gun is used for providing high-pressure air to filter-press the slurry, so that the normal operation of a stirring system is not influenced, and the internal structure of the device is not required to be changed; meanwhile, by adjusting the angle of the high-pressure air gun, cyclone can be formed in the stirring dispersion cavity, and the effect of the stirring blades is combined to accelerate the outward throwing of the nano slurry, so that the solid-liquid separation efficiency is promoted.
Further, a plurality of supersonic generator of even installation in stirring dispersion chamber for prevent that nano-material from piling up on stainless steel filter screen, leading to the stainless steel filter screen to block up in filtering process, effectively improve nano-material's filtration efficiency, in the back-mixing stage, accelerate nano-material's dispersion efficiency.
Furthermore, a high-pressure liquid injection gun is used for inputting cleaning liquid, and in the process of repeated cleaning, the angle of the high-pressure liquid injection gun is adjusted to enable the gun mouth to be aligned with the stainless steel filter screen, so that the cleaning liquid can effectively strip filter cakes attached to the stainless steel filter screen, and the rapid dispersion of the nano materials in new dispersion liquid is promoted.
Further, all install pressure sensor on the cauldron body in the stainless steel and cauldron shell inner wall, because of the device belongs to the area pressure operation in the cleaning process, if the device pressure exceedes the early warning value, can take the pressure release means of shutting down, guarantee device safety in utilization.
Furthermore, the whole machine is simple in design, complex operation is not needed, the operation is easy to master, and automatic unmanned operation can be realized through programming.
Drawings
FIG. 1 is a schematic view of the overall structure of the nanomaterial cleaning apparatus of the present invention.
FIG. 2 is a schematic view of the overall structure of the inner vessel of the nanomaterial cleaning apparatus of the present invention.
Fig. 3 is a top view of the invention at a-a in fig. 2.
FIG. 4 is a schematic view of the lower part of the inner tank of the cleaning apparatus for nano-materials in the present invention.
FIG. 5 is a top view of the inner vessel of the cleaning apparatus for nano-materials in the present invention.
FIG. 6 is a schematic view of the structure of the kettle shell of the nanomaterial cleaning apparatus of the present invention.
FIG. 7 is a top view of the kettle shell of the nanomaterial cleaning apparatus of the present invention.
In the figure: 1. a stirring motor; 2. a high pressure liquid spray gun; 3. a high pressure air lance; 4. an exhaust port; 5. a handle; 6. an inner kettle body; 7. a kettle shell; 8. a stirring shaft; 9. a stirring blade; 10. an ultrasonic generator; 11. a support; 12 a base; 13. a liquid discharge port; 14. a stainless steel filter screen; 15. a pressure sensor; 16. an outer support frame; 17. and (4) feeding a material inlet.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
As shown in fig. 1-7, a device for cleaning nano materials comprises a stainless steel kettle shell 7, a stainless steel inner kettle body 6, a stainless steel inner support frame, a stainless steel filter screen 14, a stainless steel outer support frame 16, a high-pressure air gun 3, a high-pressure liquid spray gun 2, an ultrasonic generator 10, a pressure sensor 15, a stirring motor 1, a stirring shaft 8, stirring blades 9, a support 11 and a base 12.
The kettle shell 7 is arranged outside the inner kettle body 6, the inner support frame is connected with the inner kettle body 6 into a whole, the stainless steel filter screen 14 and the outer support frame 16 are detachably arranged outside the inner kettle body 6, and the stainless steel filter screen 14 divides the inner space of the inner kettle body 6 and the interlayer space of the inner kettle body 6 and the kettle shell 7 into an upper stirring dispersion cavity and a lower filtering cavity.
The high-pressure air gun 3 and the high-pressure liquid spray gun 2 are concentrically and annularly arranged on the inner kettle body 6 cover, the outlets of the high-pressure air gun 3 and the high-pressure liquid spray gun 2 are positioned in the stirring dispersion cavity, and the angles of the high-pressure air gun 3 and the high-pressure liquid spray gun 2 can be adjusted.
The inner kettle body 6 is covered with a feed inlet 17 and an exhaust port 4 which are communicated with the stirring dispersion cavity and can be sealed and closed.
And a liquid outlet 13 which is communicated with the filter cavity and can be sealed and closed is arranged at the bottom of the kettle shell 7.
In this example, the inner volume of the autoclave was set to 5m3The device comprises a stirring motor, a frequency converter, a stirring shaft and a rotating shaft, wherein the stirring motor adopts a three-phase asynchronous motor, the power is 55 KW, the synchronous rotating speed is 3000r/min, the rotating speed is adjustable, the stirring blade and the rotating shaft are made of 304 stainless steel, and the stirring shaft and the stirring blade are welded and fixed.
The number of the high-pressure liquid injection guns is 4, the high-pressure liquid injection guns are arranged according to the positions shown in figure 5, the high-pressure liquid injection guns are externally connected with a water storage tank, deionized water is used as cleaning liquid, and the angle of a gun nozzle of each spray gun can be preset manually or in an electric control mode or regularly swings through a program; the number of the high-pressure air guns is 6, the high-pressure air guns are arranged according to the positions shown in figure 5 and are externally connected with an air compressor, and the high-pressure air guns can be preset in a manual or electric control mode and are inclined in the kettle at a uniform angle so as to form air cyclone.
The stainless steel filter screen adopts 200 meshes, and the inner and outer support frames both adopt 304 stainless steel.
The ultrasonic generators are designed into 20, are externally attached with stainless steel covers and are arranged on the inner support frame; the two pressure sensors are externally attached with stainless steel covers and are respectively arranged on the kettle shell and the cover of the inner kettle body for triggering the shutdown of the system and avoiding the overlarge pressure from exceeding a threshold value.
The feed inlet, the exhaust port and the liquid outlet are all connected with 304 stainless steel pipelines, and electromagnetic valves are arranged in the pipelines to realize automatic opening and closing under control.
The base and the bracket are designed according to the structures shown in figures 6 and 7 and are both made of 304 stainless steel and are fixed together by welding.
This example illustrates the cleaning of an iron-based catalyst as an example.
The iron-based catalyst can be used for catalyzing Fischer-Tropsch synthesis reaction, so that a precipitation method can be used for preparing the non-supported iron-based catalyst, a precipitator of the iron-based catalyst is mainly hydroxide or carbonate of alkali metal sodium or potassium, and a large amount of sodium ions or potassium ions and other components are adhered to the iron-based nanocrystal after synthesis and need to be cleaned and removed.
The processing steps are as follows:
s1, opening a feed inlet 17 and an exhaust port 4, closing a liquid discharge port 13, allowing iron-based nano slurry (mixed with synthetic mother liquor) to be cleaned, obtained through synthesis, to enter a stirring dispersion cavity through the feed inlet 17, closing the feed inlet 17, and spraying deionized water cleaning liquid into the stirring dispersion cavity through a high-pressure liquid spray gun 2 until the volume of the slurry accounts for about 65% of the volume of the stirring dispersion cavity;
s2, starting a stirring mechanism to stir the nano material and the deionized water at a rotating speed of 200r/min, enabling the rotating direction of the stirring blade 9 to be upward, providing upward component acceleration, enabling the iron-based nano material to be fully dispersed in the deionized water, and starting the ultrasonic generator 10 to prevent the iron-based nano material from being deposited on the stainless steel filter screen 14;
s3, after the iron-based nano material is fully dispersed into deionized water through stirring and stabilized for 30min, opening a liquid discharge port 13, closing an exhaust port 4, adjusting the stirring motor 1 to rotate reversely, enabling the rotation direction of a stirring blade 9 to be downward, providing downward component velocity, rotating at the speed of 200r/min, then opening a high-pressure air gun 3 to supply air into the stirring dispersion cavity, adjusting the rotating speed of the stirring motor 1 and the air flow of the high-pressure air gun 3, keeping an ultrasonic generator 10 on, filtering the nano slurry in the stirring dispersion cavity through a stainless steel filter screen 14 under the assistance of ultrasonic waves by combining air pressure filtration and mechanical action, discharging the deionized water from the liquid discharge port 13 after entering a filter cavity, and keeping a filter cake on the stainless steel filter screen 14;
s4, when no deionized water is discharged from a liquid discharge port 13, closing a high-pressure air gun 3, opening an air exhaust port 4, closing the liquid discharge port 13, adjusting a stirring motor 1 to rotate a stirring blade 9 in the forward direction to provide an upward component speed, rotating at a speed of 200r/min, starting a high-pressure liquid injection gun 2 to inject the deionized water, adjusting the angle of the high-pressure liquid injection gun 2 to enable the deionized water to effectively strip off filter cakes attached to a stainless steel filter screen 14, keeping an ultrasonic generator 10 started, re-dispersing the nano filter cakes in the deionized water under the combined action of mechanical drive and ultrasonic waves of the stirring blade 9, closing the high-pressure liquid injection gun 2 when the volume of slurry in a stirring dispersion cavity accounts for about 65% of the volume of the stirring dispersion cavity, stopping input of the deionized water, and continuing stirring to ensure that the iron-based nano material;
s5, circularly repeating the step S3 and the step S4 until the iron-based nano material is cleaned, opening the feeding hole 17, extracting the iron-based nano slurry, and realizing solid-liquid separation of the iron-based nano slurry by adopting plate-and-frame filter pressing or other filter pressing modes to obtain a clean filter cake; and cleaning the next batch of samples after the device is cleaned.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the embodiments of the invention or equivalent substitutions of parts of the technical features can be made without departing from the spirit of the technical solution of the invention, which is to be covered by the technical solution of the invention.
Claims (10)
1. An apparatus for cleaning nano-materials, characterized in that: comprises a kettle shell, an inner kettle body, a filter screen, a high-pressure air gun, a high-pressure liquid spray gun and a stirring mechanism;
the kettle shell is arranged outside the inner kettle body, the filter screen is fixed on the inner kettle body or the kettle shell, and the filter screen divides the inner space of the inner kettle body and the interlayer space of the inner kettle body and the kettle shell into an upper stirring dispersion cavity and a lower filtering cavity;
the stirring mechanism comprises a stirring motor, a stirring shaft and stirring blades;
the high-pressure air gun and the high-pressure liquid injection gun are both arranged on the cover of the inner kettle body, and gun nozzles of the high-pressure air gun and the high-pressure liquid injection gun are positioned in the stirring dispersion cavity;
a feed inlet and an exhaust port which are communicated with the stirring dispersion cavity and can be sealed and closed are arranged on the cover of the inner kettle body;
and a liquid outlet which is communicated with the filter cavity and can be sealed and closed is arranged at the bottom of the kettle shell.
2. The apparatus for nanomaterial cleaning according to claim 1, wherein: and a plurality of ultrasonic generators are uniformly arranged in the stirring dispersion cavity.
3. The apparatus for nanomaterial cleaning according to claim 2, characterized in that: the stirring shaft is vertically arranged, the stirring motor is installed at the upper end of the inner kettle body cover, the rotating direction of the stirring blades is the up-down direction, and the stirring blades are of a hinge structure or a helical surface structure.
4. The apparatus for nanomaterial cleaning according to claim 3, characterized in that: the filter screen comprises an inner support frame, a stainless steel filter screen and an outer support frame which are detachably connected together, the stainless steel filter screen is arranged in an interlayer of the inner support frame and the outer support frame, and the outer support frame and the inner support frame are respectively connected with the kettle shell and/or the inner kettle body together.
5. The apparatus for nanomaterial cleaning according to claim 4, characterized in that: the high-pressure gas spray gun is annularly arranged at the top end of the inner kettle body cover, and the angle of the high-pressure gas spray gun can be adjusted so as to form cyclone in the stirring dispersion cavity.
6. The apparatus for nanomaterial cleaning according to claim 5, characterized in that: the high-pressure liquid injection gun is annularly arranged at the top end of the inner kettle body cover, the injection angle of the high-pressure liquid injection gun is adjustable to be aligned with the stainless steel filter screen to realize the stripping of the filter cake, and the handle is installed at the top end of the inner kettle body cover.
7. The apparatus for nanomaterial cleaning according to claim 6, characterized in that: the whole bag form that is of filter screen, cauldron shell bottom is corresponding bag form, the leakage fluid dram is located the minimum of filter chamber.
8. The apparatus for nanomaterial cleaning according to claim 7, characterized in that: and pressure sensors are arranged in the stirring dispersion cavity and the filtering cavity.
9. A nanomaterial cleaning method based on the apparatus for nanomaterial cleaning of any one of claims 1 to 8, characterized in that: the method comprises the following steps:
s1, opening a feed inlet and an exhaust port, closing a liquid discharge port, closing the feed inlet after a to-be-cleaned nano material enters a stirring dispersion cavity through the feed inlet, and spraying cleaning liquid into the stirring dispersion cavity through a high-pressure liquid spraying gun until the volume of slurry accounts for 60-70% of the volume of the stirring dispersion cavity;
s2, starting a stirring mechanism to stir the nano material and the cleaning liquid, enabling the stirring blade to rotate upwards to provide an upward component acceleration, starting an ultrasonic generator to prevent the nano material from depositing on the stainless steel filter screen, and enabling the nano material to be fully dispersed in the cleaning liquid;
s3, after the nano materials are fully dispersed to cleaning liquid through stirring and are stabilized for a certain time, opening a liquid discharge port, closing an exhaust port, adjusting a stirring motor to rotate reversely, enabling a stirring blade to rotate downwards to provide downward component acceleration, opening a high-pressure air gun to supply air to a stirring dispersion cavity, adjusting the rotating speed of the stirring motor and the air flow of the high-pressure air gun, keeping an ultrasonic generator on, filtering nano slurry in the stirring dispersion cavity through a stainless steel filter screen under the assistance of ultrasonic waves through air pressure filter pressing and mechanical stirring action, discharging the cleaning liquid from the liquid discharge port after the cleaning liquid enters a filter cavity, and leaving a filter cake on the stainless steel filter screen;
s4, when no cleaning liquid is discharged from the liquid discharge port, closing the high-pressure air gun, opening the air exhaust port, closing the liquid discharge port, adjusting the stirring motor to rotate in the forward direction, enabling the stirring blade to rotate upwards, simultaneously starting the high-pressure liquid injection gun to inject the cleaning liquid, keeping the ultrasonic generator started, enabling the nano filter cake to be dispersed in the cleaning liquid again under the combined action of mechanical driving and ultrasonic waves of the stirring blade, enabling the size of slurry in the to-be-stirred dispersion cavity to account for 60% -70% of the volume of the stirring dispersion cavity, closing the high-pressure liquid injection gun, stopping inputting of the cleaning liquid, and continuing stirring to ensure that the nano material is fully dispersed into the cleaning liquid and is stable;
s5, circularly repeating the step S3 and the step S4 until the nano material is cleaned, opening a feed inlet, extracting the nano slurry, and performing solid-liquid separation on the nano slurry by adopting plate-and-frame filter pressing or other filter pressing modes to obtain a clean filter cake; and cleaning the next batch of samples after the device is cleaned.
10. The nanomaterial cleaning method according to claim 9, characterized in that: the cleaning liquid used by the nano material in the steps S1-S5 is a liquid which is not flammable, not explosive, does not corrode parts of the device and does not react with the cleaned nano material; in steps S1-S5, the cleaning process of the nano material in the device is a normal temperature operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110153186.4A CN112792045A (en) | 2021-02-04 | 2021-02-04 | Device and method for cleaning nano material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110153186.4A CN112792045A (en) | 2021-02-04 | 2021-02-04 | Device and method for cleaning nano material |
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| Publication Number | Publication Date |
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| CN112792045A true CN112792045A (en) | 2021-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110153186.4A Pending CN112792045A (en) | 2021-02-04 | 2021-02-04 | Device and method for cleaning nano material |
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| CN (1) | CN112792045A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113663973A (en) * | 2021-09-22 | 2021-11-19 | 成都纽瑞特医疗科技股份有限公司 | Granule cleaning device |
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2021
- 2021-02-04 CN CN202110153186.4A patent/CN112792045A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113663973A (en) * | 2021-09-22 | 2021-11-19 | 成都纽瑞特医疗科技股份有限公司 | Granule cleaning device |
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