System and method for efficient cleaning and quantitative concentration of nanoparticles

Abstract

The invention discloses a system and a method for efficiently cleaning and quantitatively concentrating nanoparticles. The system is characterized in that a concentrator is provided with an air inlet, an air outlet, a feed port, a clear liquid outlet and a discharge port; a liquid inlet pipe is arranged between the raw material storage tank and the feed port, a liquid collecting pipe is arranged between the clear liquid outlet and the clear liquid storage tank, a liquid discharging pipe is arranged between the clear liquid outlet and the cleaning residual liquid tank, backwashing pipes are arranged between the cleaning liquid tank and the feed port and between the cleaning liquid tank and the clear liquid outlet, and a circulating pipe is arranged between the clear liquid outlet and the raw material storage tank; a liquid passing pipe is arranged in the concentrator, a motor is arranged at the top of the raw material storage tank and controls the liquid passing pipe to rotate, and the other end of the liquid passing pipe is communicated with the clear liquid outlet; the liquid passing pipe is coaxially sleeved with a plurality of disc filtering pieces. The problems that in the prior art, product loss is large, cleaning fluid separation is difficult, quantitative concentration fluctuation is large, the automation degree is low, and the labor intensity of operators is high are solved, and the problem that in the prior art, potential hazards can be caused to the production environment and the bodies of the operators is solved.

Description

Technical Field

[0001] The invention relates to the technical field of nanoparticle production, and in particular to a system and method for efficient cleaning and quantitative concentration of nanoparticles. Background Art

[0002] Nanoparticles refer to microscopic particles at the nanometer scale. They are a new type of high-end material with diverse functions and wide applications. Nanoparticles build a bridge between physical matter and atoms and molecules, and have important scientific research and application value. The industrial production of nanoparticles generally includes processes such as synthesis, cleaning, concentration and drying. Among them, the cleaning operation needs to be repeated many times in order to remove the solvent or reaction liquid to purify the product; the purpose of the concentration operation is to quantitatively reduce the liquid content of the product, improve the drying efficiency, and reduce the drying energy consumption. However, due to the extremely small size, high dispersion and high activity of nanoparticles, the cleaning and concentration processes are difficult to operate, inefficient and have a high risk factor.

[0003] At present, the existing cleaning and concentration technologies for nanoparticles in industrial production include mechanical flushing technology, ultrasonic washing technology, plasma washing technology and microwave-assisted washing technology. These technologies not only have defects such as large product losses during the cleaning process, difficulty in separating the cleaning liquid, large fluctuations in quantitative concentration, low degree of automation and high labor intensity for operators, but also the existing technologies cannot complete production operations in a closed environment, which may cause potential harm to the production environment and the health of the operators. Summary of the invention

[0004] The present invention provides a system and method for efficient cleaning and quantitative concentration of nanoparticles, which not only solves the problems of large product loss, difficult separation of cleaning liquid, large fluctuation of quantitative concentration, low degree of automation and high labor intensity of operators in the existing nanoparticles in industrial production, but also solves the problem that the existing technology may cause potential harm to the production environment and the operator's body.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] In a first aspect, the present invention provides a system for efficient cleaning and quantitative concentration of nanoparticles, the system comprising: a raw material storage tank, a concentrator, a clear liquid storage tank, a cleaning residual liquid tank, a collection tank, and a cleaning liquid tank;

[0007] The top of the concentrator is provided with an air inlet and an exhaust port, the bottom of the side wall of the concentrator is provided with a feed inlet and a clear liquid outlet, and the bottom of the concentrator is provided with a discharge port;

[0008] A liquid inlet pipe is provided between the raw material storage tank and the feed port, and a feed valve and a feed pump are provided on the liquid inlet pipe;

[0009] A discharge pipe is provided between the discharge port and the collecting tank, and a discharge valve is provided on the discharge pipe; a collecting pipe is provided between the clear liquid outlet and the clear liquid storage tank, and a collecting valve is provided on the collecting pipe; a discharge pipe is provided between the clear liquid outlet and the residual cleaning liquid tank, and a discharge valve is provided on the discharge pipe; backwash pipes are provided between the cleaning liquid tank and the feed port and between the cleaning liquid tank and the clear liquid outlet, and a cleaning valve and a cleaning pump are provided on the backwash pipe; a circulation pipe is provided between the clear liquid outlet and the raw material storage tank, and a regulating valve is provided on the circulation pipe;

[0010] The air inlet is connected to an air inlet pipe, and the air inlet pipe is provided with an air inlet valve; the air outlet is connected to an exhaust pipe, and the exhaust pipe is provided with an exhaust valve;

[0011] A liquid pipe is provided inside the concentrator along its axial direction, a motor is provided on the top of the raw material storage tank, an output shaft of the motor is fixedly connected to one end of the liquid pipe for controlling the rotation of the liquid pipe, and the other end of the liquid pipe is connected to the clear liquid outlet;

[0012] A plurality of disc filters are coaxially and fixedly sleeved on the liquid passage pipe in sequence, and a clear liquid flow channel is provided between a side of the disc filter close to the liquid passage pipe and a side wall of the liquid passage pipe.

[0013] In a possible implementation, the disc filter element includes a tray, a support plate disposed at an opening at the top of the tray, and a filter material disposed on the top of the support plate.

[0014] In a possible implementation, the pore size of the filter material is 0.01 to 10 μm;

[0015] The filter material is one of stainless steel, alloy, ceramic and molecular sieve.

[0016] In a possible implementation, the system for efficient cleaning and quantitative concentration of nanoparticles further includes a three-way pipe;

[0017] The first end of the three-way pipe is used to connect to the outlet of the cleaning pump, the second end of the three-way pipe is used to connect to the clear liquid outlet, and the third end of the three-way pipe is used to connect to the feed port.

[0018] In a possible implementation, the system for efficient cleaning and quantitative concentration of nanoparticles further includes a four-way tube;

[0019] The first end of the four-way pipe is used to connect to the clean liquid outlet, the second end of the four-way pipe is used to connect to the inlet of the cleaning residual liquid tank, the third end of the four-way pipe is used to connect to the inlet of the clean liquid storage tank, and the fourth end of the four-way pipe is used to connect to the raw material storage tank through the circulation pipe.

[0020] In a possible implementation, a sight glass is provided on the pipeline between the first end of the four-way pipe and the clear liquid outlet.

[0021] In a possible implementation, a differential pressure gauge is provided between the feed inlet and the clear liquid outlet.

[0022] In a second aspect, the present invention provides a method for efficient cleaning and quantitative concentration of nanoparticles, which is applied to any of the above-mentioned systems for efficient cleaning and quantitative concentration of nanoparticles, and the method comprises:

[0023] Self-precoating filtration, starting the motor to drive the liquid pipe and the disc filter to rotate at a first preset speed, starting the feed pump, controlling the nanoparticle mixed liquid in the raw material storage tank to enter the concentrator, and then sequentially passing through the disc filter, the liquid pipe, the clear liquid outlet and the circulation pipe to return to the raw material storage tank at a third flow rate;

[0024] Concentration and purification, closing the regulating valve, opening the liquid collecting valve, controlling the nanoparticle mixed liquid to continuously enter the concentrator at the first flow rate under the action of the feed pump, concentrating the nanoparticle mixed liquid through the disc filter, and discharging the concentrated clear liquid to the clear liquid storage tank through the disc filter, the liquid passing pipe, the clear liquid outlet and the liquid collecting pipe in sequence, and the concentrated nanoparticles are accumulated on the surface of the disc filter; the third flow rate is less than or equal to the first flow rate;

[0025] During product cleaning, the motor is turned off, the air inlet valve is opened, and the liquid collecting valve is kept open, so that the concentrated reaction liquid in the concentrator is discharged into the clear liquid storage tank to realize material pressing; after material pressing, the cleaning pump is started, the liquid collecting valve and the air inlet valve are closed, the cleaning valve is opened, and the cleaning liquid in the cleaning liquid tank is controlled to enter the concentrator at a second flow rate to clean the disc filter element, and the drain valve is opened to control the cleaning liquid after cleaning to be discharged into the cleaning residual liquid tank; after cleaning, the air inlet valve is opened, and the drain valve is kept open to control the cleaning liquid after cleaning to be discharged into the cleaning residual liquid tank, and after the liquid level in the concentrator is reduced to the first preset liquid level, the drain valve is closed to obtain a concentrated mixture; the second flow rate is greater than or equal to the first flow rate;

[0026] The product is discharged, the discharge valve is opened, the motor is started to drive the liquid pipe and the disc filter to rotate at a second preset speed, the concentrated mixture is thrown out, and discharged into the collection tank through the discharge pipe; the second preset speed is greater than the first preset speed.

[0027] In a possible implementation, after the product is discharged, the method further includes:

[0028] The cleaning device is ready for use, the discharge valve is kept closed, the drain valve is opened, the cleaning pump is started, and the cleaning liquid in the cleaning liquid tank is controlled to enter the concentrator at the second flow rate. After the liquid level in the concentrator is above the uppermost disc filter, the cleaning pump is turned off; the motor is started and controlled to drive the liquid pipe and the disc filter to rotate at the second preset speed to clean the residual nanoparticles on the surface of the disc filter and drain the cleaning liquid in the concentrator.

[0029] In a possible implementation, the third flow rate is 1 / 6 to 1 times of the first flow rate;

[0030] The second flow rate is 1 to 5 times the first flow rate.

[0031] The embodiments of the present invention provide a system and method for efficient cleaning and quantitative concentration of nanoparticles, which not only realize the process production level of less product loss, simple cleaning liquid separation, small quantitative concentration fluctuation, high degree of automation and low labor intensity in the cleaning and concentration process in the industrial production of nanoparticles; but also the entire system for efficient cleaning and quantitative concentration of nanoparticles is a closed production system, which will not cause potential harm to the production environment and the operator's body.

[0032] The production process route of the invention is reasonably designed, energy-saving and environmentally friendly, and improves the economic benefit, environmental benefit and social benefit of the nanoparticle industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A system process diagram for efficient cleaning and quantitative concentration of nanoparticles provided in an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the structure of a disc filter in a system for efficient cleaning and quantitative concentration of nanoparticles provided by an embodiment of the present invention;

[0035] Figure 3 A flowchart of the steps of a method for efficient cleaning and quantitative concentration of nanoparticles provided in an embodiment of the present invention.

[0036] Reference numerals and description of the drawings:

[0037] 1. Raw material storage tank; 2. Concentrator; 21. Air inlet; 22. Exhaust port; 23. Feed port; 24. Clean liquid outlet; 25. Discharge port; 26. Liquid pipe; 27. Motor; 28. Disc filter element; 281. Clean liquid flow channel; 282. Tray; 283. Support plate; 284. Filter material; 285. Liquid collecting chamber; 3. Clean liquid storage tank; 4. Cleaning residual liquid tank; 5. Collection tank; 6. Cleaning liquid tank; 7. Liquid inlet pipe; 71. Feed valve; 72, feed pump; 8, discharge pipe; 81, discharge valve; 9, liquid collecting pipe; 91, liquid collecting valve; 10, discharge pipe; 101, discharge valve; 11, backwash pipe; 111, backwash valve; 112, cleaning pump; 113, cleaning valve; 12, circulation pipe; 121, regulating valve; 13, air inlet pipe; 131, air inlet valve; 14, drain pipe; 141, drain valve; 142, safety valve; 15, feed pipe; 16, liquid replenishment pipe. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "multiple" means two or more. In addition, the use of "based on" or "according to" means openness and inclusiveness, because the process, steps, calculations or other actions "based on" or "according to" one or more of the conditions or values ​​may be based on additional conditions or values ​​beyond the described values ​​in practice.

[0040] The embodiments of the present invention provide a system and method for efficient cleaning and quantitative concentration of nanoparticles, which not only solve the problems of large product loss, difficult separation of cleaning liquid, large fluctuation in quantitative concentration, low degree of automation and high labor intensity of operators in the existing nanoparticles in industrial production, but also solve the problem that the existing technology may cause potential harm to the production environment and the operator's body.

[0041] like Figure 1 , Figure 2 As shown, in the first aspect, an embodiment of the present invention provides a system for efficient cleaning and quantitative concentration of nanoparticles, the system comprising a raw material storage tank 1, a concentrator 2, a clear liquid storage tank 3, a cleaning residual liquid tank 4, a collection tank 5 and a cleaning liquid tank 6.

[0042] An air inlet 21 and an air outlet 22 are provided at the top of the concentrator 2 , a feed inlet 23 and a clear liquid outlet 24 are provided at the bottom of the side wall of the concentrator 2 , and a discharge port 25 is provided at the bottom of the concentrator 2 .

[0043] The top of the shell of the concentrator 2 is an elliptical head, and the bottom is a conical head. The feed inlet 23 and the clear liquid outlet 24 are respectively arranged on both sides of the bottom of the side wall of the concentrator 2. The discharge port 25 is arranged at the tip of the conical bottom.

[0044] A liquid inlet pipe 7 is provided between the raw material storage tank 1 and the feed port 23 , and a feed valve 71 and a feed pump 72 are provided on the liquid inlet pipe 7 .

[0045] The inlet of the feed pump 72 is connected to the bottom opening of the raw material storage tank 1 , the outlet of the feed pump 72 is connected to the feed port 23 , and the feed valve 71 is arranged on the liquid inlet pipe 7 between the outlet of the feed pump 72 and the feed port 23 .

[0046] A first flow meter F0 is also provided at the outlet of the feed pump 72 for measuring the feed flow rate from the raw material storage tank to the concentrator.

[0047] A discharge pipe 8 is provided between the discharge port 25 and the collecting tank 5 , and a discharge valve 81 is provided on the discharge pipe 8 .

[0048] Among them, the collection tank can be used not only to collect the concentrated product, but also to collect the waste liquid finally generated.

[0049] A liquid collecting pipe 9 is provided between the clear liquid outlet 24 and the clear liquid storage tank 3 , and a liquid collecting valve 91 is provided on the liquid collecting pipe 9 .

[0050] Among them, opening the liquid collecting valve 91 can realize the collection of clear liquid.

[0051] A drain pipe 10 is provided between the clean liquid outlet 24 and the cleaning residual liquid tank 4 , and a drain valve 101 is provided on the drain pipe 10 .

[0052] Among them, opening the drain valve 101 can realize the collection of the cleaning liquid.

[0053] A backwash pipe 11 is provided between the cleaning liquid tank 6 and the feed port 23 and between the cleaning liquid tank 6 and the clean liquid outlet 24 . A backwash valve 111 , a cleaning valve 113 and a cleaning pump 112 are provided on the backwash pipe 11 .

[0054] Among them, the inlet of the cleaning pump 112 is connected to the bottom opening of the cleaning liquid tank 6, and the outlet of the cleaning pump 112 is connected to the clean liquid outlet 24 and the feed port 23 respectively through two output pipelines. The cleaning valve 113 is arranged on the output pipeline between the outlet of the cleaning pump 112 and the feed port 23, and the backwash valve 111 is arranged on the output pipeline between the outlet of the cleaning pump 112 and the clean liquid outlet 24; a second flow meter F2 is also arranged on the output pipeline between the outlet of the cleaning pump 112 and the clean liquid outlet 24, which is used to detect the flow rate of the cleaning liquid passing through the output pipeline.

[0055] A circulation pipe 12 is provided between the clear liquid outlet 24 and the raw material storage tank 1 , and a regulating valve 121 is provided on the circulation pipe 12 .

[0056] The circulation pipe 12 is also provided with a third flow meter F1 for detecting the flow rate of the liquid circulating back to the raw material storage tank 1 .

[0057] The air inlet 21 is connected to an air inlet pipe 13 , on which an air inlet valve 131 is provided; the air outlet 22 is connected to an exhaust pipe 14 , on which an exhaust valve 141 is provided.

[0058] A pressure gauge port and a safety valve port are also provided on the top of the concentrator 2 , wherein the pressure gauge port is installed with a pressure gauge P, and the safety valve port is connected to the exhaust pipe 14 through a safety valve 142 .

[0059] A liquid pipe 26 is provided inside the concentrator 2 along its axial direction, and a motor 27 is provided on the top of the raw material storage tank 1. The output shaft of the motor 27 is fixedly connected to one end of the liquid pipe 26 for controlling the rotation of the liquid pipe 26. The other end of the liquid pipe 26 is connected to the clear liquid outlet 24.

[0060] A plurality of disc filters 28 are coaxially and fixedly sleeved on the liquid pipe 26 in sequence, and a clear liquid flow channel 281 is defined between a side of the disc filter 28 close to the liquid pipe 26 and a side wall of the liquid pipe 26 .

[0061] The motor 27 can be driven electrically, hydraulically or gaseously, and the motor speed is adjustable. The motor is only used to drive the liquid passage 26 to drive the disc filter 28 to rotate at a preset speed.

[0062] After the nanoparticle mixed liquid enters the concentrator 2, the nanoparticles remain on the surface of the disc filter 28, and the clear liquid passes through the disc filter 28, the clear liquid flow channel 281, and the liquid pipe 26 in sequence to reach the clear liquid outlet 24 and be discharged, thereby achieving separation of the nanoparticles and the clear liquid.

[0063] The raw material storage tank 1 is also connected to a material supply pipe 15 for replenishing new nanoparticle mixed liquid into the raw material storage tank 1 ; the cleaning liquid tank 6 is also connected to a liquid replenishing pipe 16 for replenishing new cleaning liquid into the cleaning liquid tank 6 .

[0064] Furthermore, the disc filter element 28 includes a tray 282 , a support tray 283 disposed at an opening at the top of the tray 282 , and a filter material 284 disposed on the top of the support tray 283 .

[0065] The space between the tray 282 and the support plate 283 is a liquid collecting chamber 285 , and the clear liquid flow channel 281 is opened between the liquid collecting chamber 285 and the liquid collecting pipe 9 .

[0066] Furthermore, the pore size of the filter material 284 is 0.01-10 μm.

[0067] The filter material 284 is one of stainless steel, alloy, ceramic and molecular sieve.

[0068] In this embodiment, the pore size of the filter material 284 is 0.01 μm, and the material of the filter material is stainless steel; the distance between the outer wall of the filter material 284 and the inner wall of the concentrator 2 is 50 mm.

[0069] Furthermore, the system for efficient cleaning and quantitative concentration of nanoparticles also includes a three-way pipe.

[0070] The first end of the three-way pipe is used to connect to the outlet of the cleaning pump 112 , the second end of the three-way pipe is used to connect to the clear liquid outlet 24 , and the third end of the three-way pipe is used to connect to the feed port 23 .

[0071] Furthermore, the system for efficient cleaning and quantitative concentration of nanoparticles also includes a four-way tube.

[0072] Among them, the first end of the four-way pipe is used to connect to the clear liquid outlet 24, the second end of the four-way pipe is used to connect to the inlet of the cleaning residual liquid tank 4, the third end of the four-way pipe is used to connect to the inlet of the clear liquid storage tank 3, and the fourth end of the four-way pipe is used to connect to the raw material storage tank 1 through the circulation pipe 12.

[0073] Furthermore, a sight glass is provided on the pipeline between the first end of the four-way pipe and the clear liquid outlet 24 to facilitate the discharge of the clear liquid from the clear liquid outlet 24.

[0074] Furthermore, a differential pressure gauge PDI is provided between the feed inlet 23 and the clear liquid outlet 24 for detecting the pressure difference between the feed inlet 23 pipeline and the clear liquid outlet 24 pipeline.

[0075] like Figure 1 , Figure 3 As shown, in a second aspect, an embodiment of the present invention further provides a method for efficient cleaning and quantitative concentration of nanoparticles, which is applied to the system for efficient cleaning and quantitative concentration of nanoparticles in any of the above items, and the method comprises:

[0076] Step 101, self-precoat filtration.

[0077] The starting motor 27 drives the liquid pipe 26 and the disc filter 28 to rotate at a first preset speed, and the feed pump 72 is started to control the nanoparticle mixed liquid in the raw material storage tank 1 to enter the concentrator 2, and then return to the raw material storage tank 1 at a third flow rate through the disc filter 28, the liquid pipe 26, the clear liquid outlet 24 and the circulation pipe 12 in sequence.

[0078] Among them, the first preset rotation speed is 5-50r / min, and the third flow rate is the circulating liquid flow rate.

[0079] In this process, the nanoparticles are gradually separated and deposited on the surface of the disc filter 28, and accumulate to form a filter cake; the separated liquid is sequentially sent back to the raw material storage tank 1 through the liquid pipe 26, the clear liquid outlet 24 and the circulation pipe 12 for circulation filtration.

[0080] The execution of the self-precoating filtration process can set a cut-off time; the state of the output clear liquid can also be observed through the sight glass of the clear liquid outlet 24, and the self-precoating filtration process is terminated when the clear liquid is clear and transparent.

[0081] In this embodiment, the first preset rotation speed is set to 40 r / min. The third flow rate is monitored by the third flow meter F1, and the third flow rate is half of the feed flow rate from the raw material storage tank 1 to the concentrator 2.

[0082] Step 102: Concentration and purification.

[0083] Close the regulating valve 121, open the liquid collecting valve 91, control the nanoparticle mixture to continuously enter the concentrator 2 at the first flow rate under the action of the feed pump 72, concentrate the nanoparticle mixture through the disc filter 28, and discharge the concentrated clear liquid to the clear liquid storage tank 3 through the disc filter 28, the liquid passing pipe 26, the clear liquid outlet 24 and the liquid collecting pipe 9 in sequence, and the concentrated nanoparticles are accumulated on the surface of the disc filter 28.

[0084] The third flow rate is less than or equal to the first flow rate.

[0085] Specifically, the third flow rate is 1 / 6 to 1 times of the first flow rate, and the first flow rate is monitored by the first flow meter F0.

[0086] In this process, the filtering condition of the disc filter 28 is determined by monitoring the pressure difference between the liquid inlet pipe 7 and the liquid collecting pipe 9. When the pressure difference is 50-500 kPa, the feed pump 72 is turned off to stop the feed. Alternatively, the feed is stopped when the logistics in the raw material storage tank 1 is processed.

[0087] The pressure difference between the liquid inlet pipe 7 and the liquid collecting pipe 9 is monitored by a differential pressure gauge PDI.

[0088] After the concentration and purification is completed, the filter cake thickness on the surface of the disc filter element 28 is represented by δ, and the total amount of the filter cake is represented by m1. Specifically, the filter cake thickness is generally 5 to 30 mm.

[0089] In the embodiment of the present invention, the feeding is stopped when the pressure difference reaches 280 kPa, and the filter cake thickness is 18 mm.

[0090] Step 103: product cleaning.

[0091] The motor 27 is turned off to stop stirring. The air inlet valve 131 is opened, and the liquid collecting valve 91 is kept open, so that the concentrated reaction liquid in the concentrator 2 is discharged into the clear liquid storage tank 3 to achieve material pressing.

[0092] After the pressing is completed, the cleaning pump 112 is started, the liquid collecting valve 91 and the air inlet valve 131 are closed, the cleaning valve 113 is opened, and the cleaning liquid in the cleaning liquid tank 6 is controlled to enter the concentrator 2 at a second flow rate to clean the disc filter element 28. The drain valve 101 is opened to control the cleaning liquid after cleaning to be discharged into the cleaning residual liquid tank 4. After the preset time t, the cleaning is completed.

[0093] After cleaning is completed, the air inlet valve 131 is opened and the drain valve 101 is kept open to control the cleaning liquid to be discharged into the cleaning residual liquid tank 4. After the liquid level in the concentrator 2 drops to the first preset liquid level, the drain valve 101 is closed to obtain a concentrated mixture.

[0094] The second flow rate is greater than or equal to the first flow rate.

[0095] Specifically, the second flow rate is 1 to 5 times the first flow rate.

[0096] When the first preset liquid level is 5% of the height of the concentrator 2, the concentration process is terminated. At this time, the weight of the concentrated mixture in the concentrator 2 is represented by m2, and the concentration w of the concentrated mixture can be expressed as:

[0097]

[0098] Step 104: product discharge.

[0099] The discharge valve 81 is opened, and the motor 27 is started to drive the liquid pipe 26 and the disc filter 28 to rotate at a second preset speed, so that the concentrated mixture is thrown out and discharged into the collection tank 5 through the discharge pipe 8.

[0100] The second preset speed is greater than the first preset speed. Specifically, the second preset speed is 50-260 r / min.

[0101] In the embodiment of the present invention, after the concentrated mixture is discharged into the collecting tank 5, the concentrated mixture in the collecting tank 5 is promptly cleared and stored. The second preset rotation speed is set to 120 r / min, and the second flow rate is set to twice the first flow rate.

[0102] Further, after the product is discharged, the method further comprises:

[0103] Step 105, clean and set aside.

[0104] Keep the discharge valve 81 closed, open the drain valve 141, start the cleaning pump 112, control the cleaning liquid in the cleaning liquid tank 6 to enter the concentrator 2 at the second flow rate, and turn off the cleaning pump 112 after the liquid level in the concentrator 2 is above the uppermost disc filter 28.

[0105] The motor 27 is started and controlled to drive the liquid pipe 26 and the disc filter 28 to rotate at a second preset speed to clean the residual nanoparticles on the surface of the disc filter 28 and drain the cleaning liquid in the concentrator 2.

[0106] The cleaning liquid with residual nanoparticles can be discharged into the collection tank 5 .

[0107] In the embodiment of the present invention, the opening and closing of the valve, the opening and closing of the motor and the speed control, and the opening and closing of the feed pump and the cleaning pump are realized through a PLC control system or a factory DCS control system.

[0108] The embodiments of the present invention provide a system and method for efficient cleaning and quantitative concentration of nanoparticles, which not only realize the process production level of less product loss, simple cleaning liquid separation, small quantitative concentration fluctuation, high degree of automation and low labor intensity in the cleaning and concentration process in the industrial production of nanoparticles; but also the entire system for efficient cleaning and quantitative concentration of nanoparticles is a closed production system, which will not cause potential harm to the production environment and the operator's body.

[0109] The production process route of the invention is reasonably designed, energy-saving and environmentally friendly, and improves the economic benefit, environmental benefit and social benefit of the nanoparticle industry.

[0110] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0111] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A system for efficient cleaning and quantitative concentration of nanoparticles, characterized in that: It comprises a raw material storage tank (1), a concentrator (2), a clear liquid storage tank (3), a cleaning residual liquid tank (4), a collecting tank (5) and a cleaning liquid tank (6); The top of the concentrator (2) is provided with an air inlet (21) and an air outlet (22), the bottom of the side wall of the concentrator (2) is provided with a feed inlet (23) and a clear liquid outlet (24), and the bottom of the concentrator (2) is provided with a discharge port (25); A liquid inlet pipe (7) is provided between the raw material storage tank (1) and the feed port (23), and a feed valve (71) and a feed pump (72) are provided on the liquid inlet pipe (7); A discharge pipe (8) is provided between the discharge port (25) and the collecting tank (5), and a discharge valve (81) is provided on the discharge pipe (8); a liquid collecting pipe (9) is provided between the clear liquid outlet (24) and the clear liquid storage tank (3), and a liquid collecting valve (91) is provided on the liquid collecting pipe (9); a discharge pipe (10) is provided between the clear liquid outlet (24) and the residual cleaning liquid tank (4), and a discharge valve (101) is provided on the discharge pipe (10); a backwash pipe (11) is provided between the cleaning liquid tank (6) and the feed port (23) and between the cleaning liquid tank (6) and the clear liquid outlet (24), and a cleaning valve (111) and a cleaning pump (112) are provided on the backwash pipe (11); a circulation pipe (12) is provided between the clear liquid outlet (24) and the raw material storage tank (1), and a regulating valve (121) is provided on the circulation pipe (12); The air inlet (21) is connected to an air inlet pipe (13), and the air inlet pipe (13) is provided with an air inlet valve (131); the air outlet (22) is connected to an exhaust pipe (14), and the exhaust pipe (14) is provided with an exhaust valve (141); A liquid passage pipe (26) is provided inside the concentrator (2) along its axial direction, a motor (27) is provided on the top of the raw material storage tank (1), an output shaft of the motor (27) is fixedly connected to one end of the liquid passage pipe (26) for controlling the rotation of the liquid passage pipe (26), and the other end of the liquid passage pipe (26) is communicated with the clear liquid outlet (24); A plurality of disc filters (28) are coaxially and fixedly sleeved on the liquid passage pipe (26) in sequence, and a clear liquid flow channel (281) is provided between a side of the disc filter (28) close to the liquid passage pipe (26) and a side wall of the liquid passage pipe (26).

2. The system for efficient cleaning and quantitative concentration of nanoparticles according to claim 1, characterized in that: The disc filter (28) comprises a tray (282), a support plate (283) arranged at the top opening of the tray (282), and a filter material (284) arranged on the top of the support plate (283).

3. The system for efficient cleaning and quantitative concentration of nanoparticles according to claim 2, characterized in that: The pore size of the filter material (284) is 0.01 to 10 μm; The filter material (284) is one of stainless steel, alloy, ceramic and molecular sieve.

4. The system for efficient cleaning and quantitative concentration of nanoparticles according to claim 1, characterized in that: The system for efficient cleaning and quantitative concentration of nanoparticles also includes a three-way pipe; The first end of the three-way pipe is used to connect to the outlet of the cleaning pump (112), the second end of the three-way pipe is used to connect to the clear liquid outlet (24), and the third end of the three-way pipe is used to connect to the feed port (23).

5. The system for efficient cleaning and quantitative concentration of nanoparticles according to claim 1, characterized in that: The system for efficient cleaning and quantitative concentration of nanoparticles also includes a four-way tube; The first end of the four-way pipe is used to connect to the clean liquid outlet (24), the second end of the four-way pipe is used to connect to the inlet of the cleaning residual liquid tank (4), the third end of the four-way pipe is used to connect to the inlet of the clean liquid storage tank (3), and the fourth end of the four-way pipe is used to connect to the raw material storage tank (1) through the circulation pipe (12).

6. The system for efficient cleaning and quantitative concentration of nanoparticles according to claim 5, characterized in that: A sight glass is provided on the pipeline between the first end of the four-way pipe and the clear liquid outlet (24).

7. The system for efficient cleaning and quantitative concentration of nanoparticles according to claim 1, characterized in that: A differential pressure gauge is provided between the feed inlet (23) and the clear liquid outlet (24).

8. A method for efficient cleaning and quantitative concentration of nanoparticles, characterized in that: A system for efficient cleaning and quantitative concentration of nanoparticles according to any one of claims 1 to 7, the method comprising: After the pre-coating filtration, the motor (27) is started to drive the liquid pipe (26) and the disc filter (28) to rotate at a first preset speed, and the feed pump (72) is started to control the nanoparticle mixed liquid in the raw material storage tank (1) to enter the concentrator (2), and then return to the raw material storage tank (1) at a third flow rate through the disc filter (28), the liquid pipe (26), the clear liquid outlet (24) and the circulation pipe (12); Concentration and purification, closing the regulating valve (121), opening the liquid collecting valve (91), controlling the nanoparticle mixed liquid to continuously enter the concentrator (2) at the first flow rate under the action of the feed pump (72), concentrating the nanoparticle mixed liquid through the disc filter (28), and discharging the concentrated clear liquid to the clear liquid storage tank (3) through the disc filter (28), the liquid passage pipe (26), the clear liquid outlet (24) and the liquid collecting pipe (9) in sequence, and the concentrated nanoparticles are accumulated on the surface of the disc filter (28); the third flow rate is less than or equal to the first flow rate; The product is cleaned by turning off the motor (27), opening the air inlet valve (131), and keeping the liquid collecting valve (91) open, so that the concentrated reaction liquid in the concentrator (2) is discharged into the clear liquid storage tank (3) to achieve material pressing; after the material pressing is completed, starting the cleaning pump (112), closing the liquid collecting valve (91) and the air inlet valve (131), opening the cleaning valve (113), controlling the cleaning liquid in the cleaning liquid tank (6) to enter the concentrator (2) at a second flow rate, and filtering the disc The device (28) is cleaned, and the drain valve (101) is opened to control the cleaning liquid after cleaning to be discharged into the cleaning residual liquid tank (4); after the cleaning is completed, the air inlet valve (131) is opened, and the drain valve (101) is kept open to control the cleaning liquid after cleaning to be discharged into the cleaning residual liquid tank (4); after the liquid level in the concentrator (2) drops to a first preset liquid level, the drain valve (101) is closed to obtain a concentrated mixture; the second flow rate is greater than or equal to the first flow rate; The product is discharged, the discharge valve (81) is opened, and the motor (27) is started to drive the liquid pipe (26) and the disc filter (28) to rotate at a second preset speed, so that the concentrated mixture is thrown out and discharged into the collection tank (5) through the discharge pipe (8); the second preset speed is greater than the first preset speed.

9. The method for efficient cleaning and quantitative concentration of nanoparticles according to claim 8, characterized in that: After the product is discharged, the method further comprises: The cleaning device is put into standby mode, the discharge valve (81) is kept closed, the drain valve (141) is opened, the cleaning pump (112) is started, and the cleaning liquid in the cleaning liquid tank (6) is controlled to enter the concentrator (2) at the second flow rate. After the liquid level in the concentrator (2) is submerged above the uppermost disc filter (28), the cleaning pump (112) is turned off; the motor (27) is started, and the motor (27) is controlled to drive the liquid passage pipe (26) and the disc filter (28) to rotate at the second preset speed to clean the residual nanoparticles on the surface of the disc filter (28), and to drain the cleaning liquid in the concentrator (2).

10. The method for efficient cleaning and quantitative concentration of nanoparticles according to claim 8, characterized in that: The third flow rate is 1 / 6 to 1 times of the first flow rate; The second flow rate is 1 to 5 times the first flow rate.

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