CN118634789B - Device and method for preparing active carbon capable of efficiently adsorbing fluoride - Google Patents

Abstract

The invention discloses a device and a method for preparing active carbon capable of efficiently adsorbing fluoride, and relates to the technical field of active carbon preparation. The device comprises a frame, wherein a substrate bearing mechanism, a first preparation mechanism, a second preparation mechanism and a third preparation mechanism are sequentially arranged on the frame, and substrates are stacked on the substrate bearing mechanism; the first preparation mechanism comprises a first mould, wherein the first mould is used for preparing the bottom surface of the outer layer of the activated carbon on the substrate; the second preparation mechanism comprises a second mould and a third mould, wherein the second mould is used for preparing the side wall of the outer layer of the activated carbon on the bottom surface, and the third mould is used for preparing the filling layer of the activated carbon on the bottom surface; the third preparation mechanism includes a fourth mold for preparing the top surface of the outer layer of activated carbon on the filler layer and the sidewall surface. The device can be used for preparing the active carbon with the outer layer wrapped with the filling layer, so that the active carbon has the characteristic of efficiently adsorbing fluoride, and the device also has the advantage of high efficiency in preparing the active carbon.

Description

A device and method for preparing activated carbon with high efficiency in adsorbing fluoride

Technical Field

The invention relates to the technical field of activated carbon preparation, and in particular to a device and method for preparing activated carbon for efficiently adsorbing fluoride.

Background Art

At present, there are more and more types of pollutants in water bodies, especially the emergence of some anionic pollutants, which pose a great threat to human health, such as perfluorinated compounds. According to surveys, long-term drinking of water with a fluoride content higher than 1.0-1.5 mg/L is prone to plaque, and if the fluoride content in water is higher than 4 mg/L, it can lead to fluorosis. Activated carbon is a porous adsorption material with high porosity and large specific surface area. It is a broad-spectrum adsorbent that can be used to remove pollutants in water bodies.

In the related art, in order to improve the removal efficiency of activated carbon for perfluorinated compounds and other difficult-to-degrade organic matter, quaternary ammonium compounds are used to modify the activated carbon. Quaternary ammonium compounds carry positive charges, while perfluorinated compounds mainly exist in the form of anions in water. By loading positively charged quaternary ammonium compounds on the surface of activated carbon, the electrostatic adsorption of perfluorinated compounds by activated carbon can be enhanced, thereby improving its removal efficiency.

However, the inventors found in actual applications that the modified activated carbon has an unsatisfactory adsorption efficiency for pollutants. Therefore, providing a device and method for preparing activated carbon with high efficiency in adsorbing fluoride is a technical problem to be solved urgently by those skilled in the art.

Summary of the invention

The invention discloses a device and a method for preparing activated carbon for efficiently adsorbing fluoride, so as to solve the technical problem that the modified activated carbon in the related art has low adsorption efficiency for pollutants.

In order to solve the above problems, the present invention adopts the following technical solutions:

The invention discloses a device for preparing activated carbon capable of efficiently adsorbing fluoride.

The device for preparing activated carbon with high efficiency in adsorbing fluoride of the present invention comprises a frame, on which a substrate carrying mechanism, a first preparation mechanism, a second preparation mechanism and a third preparation mechanism are sequentially arranged, wherein:

The substrates are stacked on the substrate carrying mechanism;

The first preparation mechanism includes a first mold, the first mold is slidably arranged along the height direction of the frame, the first mold is connected to the first modified activated carbon storage device, and the first mold is used to prepare the bottom surface of the outer layer of the activated carbon on the substrate;

The second preparation mechanism includes a second mold and a third mold, the second mold and the third mold are slidably arranged along the height direction of the frame, the third mold is nested in the second mold, and a preset gap is retained between the second mold and the third mold.

The second mold is connected to the first modified activated carbon storage device, and the second mold is used to prepare the side wall of the outer layer of the activated carbon on the bottom surface.

The third mold is connected to the second modified activated carbon storage device, and the third mold is used to prepare a filling layer of activated carbon on the bottom surface while preparing the side wall;

The third preparation mechanism includes a fourth mold, which is slidably arranged along the height direction of the frame, and is connected to the first modified activated carbon storage device. The fourth mold is used to prepare the top surface of the outer layer of activated carbon on the filling layer and the side wall surface.

The second aspect of the present invention discloses a method for preparing activated carbon with high efficiency in adsorbing fluoride.

The method for preparing activated carbon with high efficiency in adsorbing fluoride of the present invention is implemented by using the device for preparing activated carbon with high efficiency in adsorbing fluoride of any technical solution of the present invention, and the method comprises at least the following steps:

Step S100: preparing a first modified activated carbon and a second modified activated carbon;

Step S200: transferring the substrate on the substrate carrying mechanism to below the first mold, the first mold moving in a direction close to the substrate and contacting with the surface of the substrate, pouring the first modified activated carbon into the first mold, and forming a bottom surface on the substrate;

Step S300: transferring the substrate obtained in step S200 to below the second mold and the third mold, the second mold and the third mold move toward the bottom surface and contact the substrate or the bottom surface, pouring the first modified activated carbon into the second mold, pouring the second modified activated carbon into the third mold, and forming a side wall and a filling layer on the bottom surface at the same time;

Step S400: The substrate obtained in step S300 is transferred to the bottom of the fourth mold, the fourth mold moves toward the filling layer and contacts the filling layer and the upper surface of the side wall, the first modified activated carbon is poured into the fourth mold, and a top surface is formed on the filling layer and the side wall surface.

The technical solution adopted by the present invention can achieve the following beneficial effects:

The device and method of the present invention can be used to produce activated carbon with an outer layer wrapped around a filling layer, so that the activated carbon has the characteristic of efficiently adsorbing fluorides. Specifically, the activated carbon produced by the device and method of the present invention has an outer layer made of modified activated carbon with an adhesive added, and a filling layer made of modified activated carbon without an adhesive added. On the one hand, the filling layer does not have an adhesive added, so that the modified activated carbon of the filling layer has a larger specific surface area and pore volume to ensure the adsorption efficiency of the filling layer; on the other hand, the outer layer can be used to improve the hardness of the activated carbon with high efficiency in adsorbing fluorides, and at the same time, the loss of the modifier on the modified activated carbon of the filling layer due to water scouring, stirring, etc. can be avoided.

The device for preparing activated carbon with high efficiency in adsorbing fluoride of the present invention can simultaneously prepare the bottom surface, side wall, filling layer and top surface of the outer layer of the activated carbon by utilizing the first preparation mechanism, the second preparation mechanism and the third preparation mechanism, which is beneficial to improving the preparation efficiency of the activated carbon; and the second preparation mechanism can simultaneously prepare the side wall and filling layer of the outer layer of the activated carbon, which can also shorten the preparation time of the activated carbon and improve its preparation efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the remodeled activated carbon for efficient adsorption of fluoride in an embodiment of the present application;

FIG2 is a schematic diagram of a device for preparing activated carbon with high efficiency in adsorbing fluoride according to an embodiment of the present application;

FIG3 is an enlarged view of portion A in FIG2 ;

FIG4 is an enlarged view of portion B in FIG2 ;

FIG5 is a schematic diagram of a first mold according to an embodiment of the present application;

FIG6 is a schematic diagram of the second mold and the third mold after being assembled according to an embodiment of the present application;

FIG7 is a partial schematic diagram of the second mold and the third mold after being assembled according to the embodiment of the present application;

FIG8 is a schematic diagram of a fourth mold according to an embodiment of the present application;

9 is a schematic diagram of a process of preparing activated carbon with high efficiency in adsorbing fluoride according to an embodiment of the present application, in which a substrate is transferred to the bottom of a first mold;

10 is a schematic diagram of pouring a first modified activated carbon into a first mold during the process of preparing activated carbon for high-efficiency adsorption of fluoride in an embodiment of the present application;

FIG11 is a schematic diagram of a first pressing plate compacting a first modified activated carbon in a process of preparing activated carbon for high-efficiency adsorption of fluoride in an embodiment of the present application;

FIG12 is a schematic diagram of the separation of the first mold from the bottom surface during the process of preparing activated carbon with high efficiency in adsorbing fluoride in an embodiment of the present application;

13 is a schematic diagram of a process of preparing activated carbon with high efficiency in adsorbing fluoride according to an embodiment of the present application, in which a substrate is transferred to the bottom of a second mold;

14 is a schematic diagram of moving the blade to open the opening of the second mold and the opening of the third mold in the process of preparing activated carbon with high efficiency in adsorbing fluoride in an embodiment of the present application;

15 is a schematic diagram of a process of preparing activated carbon for efficient fluoride adsorption according to an embodiment of the present application, wherein the second mold and the third mold are moved away from the substrate;

16 is a schematic diagram of moving the blade to close the opening of the second mold and the opening of the third mold in the process of preparing activated carbon with high efficiency in adsorbing fluoride in an embodiment of the present application;

17 is a schematic diagram of the separation of the second mold and the third mold from the side wall and the filling layer during the process of preparing activated carbon with high efficiency in adsorbing fluoride in an embodiment of the present application;

18 is a schematic diagram of a substrate after being transferred to the bottom of a fourth mold during the process of preparing activated carbon for efficient adsorption of fluoride according to an embodiment of the present application;

19 is a schematic diagram of pouring the first modified activated carbon into the fourth mold during the process of preparing activated carbon with high efficiency in adsorbing fluoride in an embodiment of the present application;

FIG20 is a schematic diagram of the second pressing plate compacting the first modified activated carbon in the process of preparing activated carbon with high efficiency in adsorbing fluoride in an embodiment of the present application;

21 is a schematic diagram of the separation of the fourth mold from the top surface during the process of preparing activated carbon with high efficiency in adsorbing fluoride in an embodiment of the present application.

In the figure: 11, outer layer; 11a, bottom surface; 11b, side wall; 11c, top surface; 12, filling layer; 13, opening; 100, frame; 200, substrate bearing mechanism; 210, substrate; 211, third protrusion; 220, unloading mechanism; 300, first preparation mechanism; 310, first mold; 311, first body; 312, first feed port; 313, first pressing plate; 313a, first protrusion; 320, first driving member; 321, first cylinder; 322, second cylinder; 400, second preparation mechanism; 410, second mold; 411, second body; 4 12. Second feed port; 420. Third mould; 421. Third body; 422. Third feed port; 430. Gap; 440. Cutter assembly; 441. Blade; 442. Fourth drive member; 450. Second drive member; 500. Third preparation mechanism; 510. Fourth mould; 511. Fourth body; 512. Fourth feed port; 513. Second pressure plate; 513a. Second bump; 520. Third drive member; 521. Third cylinder; 522. Fourth cylinder; 600. Transmission mechanism; 610. Transmission belt; 611. Positioning block; 700. Product carrying mechanism.

DETAILED DESCRIPTION

To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and/or" in the specification and claims represents at least one of the connected objects, and the character "/" generally indicates that the objects associated with each other are in an "or" relationship.

The inventor found in the study that in the related art, when the activated carbon is modified, in order to make the modifier more evenly distributed on the surface of the activated carbon, it is usually necessary to first crush the activated carbon to an appropriate particle size and then perform the modification treatment; after the modification treatment, in order to meet the application requirements, the activated carbon needs to be reshaped into a block or granular shape. Activated carbon is usually reshaped into the desired shape by pressing, granulation, melt molding, injection molding, etc. During the reshaping process, a certain amount of adhesive, such as phenolic resin, is usually added. The phenolic resin can soften at high temperature and penetrate into the pores and gaps of the activated carbon particles to form a surface film that firmly bonds the activated carbon particles together. It can be seen that although the adhesive can enhance the bonding force between activated carbons and improve their mechanical strength, the use of the adhesive will occupy part of the voids in the activated carbon, thereby reducing its specific surface area and pore volume, resulting in low adsorption efficiency of the reshaped activated carbon.

On the other hand, if adhesives are not used, during the sewage treatment process, due to factors such as water scouring and stirring, some of the quaternary ammonium salt modifiers loaded on the surface of the activated carbon may fall off and flow away with the water, causing physical losses and also resulting in low adsorption efficiency of the modified activated carbon.

To this end, the present application provides a device and method for preparing activated carbon with high efficiency in adsorbing fluoride. The prepared activated carbon has a structure in which an outer layer wraps a filling layer, and the outer layer is made of modified activated carbon with added adhesive, and the filling layer is made of modified activated carbon without added adhesive. This ensures that the activated carbon not only has good hardness, but also can ensure the adsorption efficiency of the activated carbon for fluoride.

The device and method for preparing activated carbon with high efficiency in adsorbing fluoride provided in the present application are described in detail below with reference to Figures 1 to 21 through specific embodiments and their application scenarios.

The present embodiment provides an activated carbon that efficiently adsorbs fluoride. Exemplarily, the activated carbon that efficiently adsorbs fluoride in the present embodiment is obtained by reshaping the activated carbon obtained by modifying a quaternary ammonium salt. Exemplarily, the quaternary ammonium salt is 3-chloro-2-hydroxypropyltrimethylammonium chloride, 3-chloro-2-hydroxypropyl alkyldimethylammonium chloride, etc. The activated carbon that efficiently adsorbs fluoride in the present embodiment can be in the shape of a block, a sphere, or other structures. The following is an example of the activated carbon that efficiently adsorbs fluoride in the present embodiment being in the shape of a block.

The activated carbon for efficiently adsorbing fluoride in this embodiment includes an outer layer 11, as shown in Figure 1. The outer layer 11 is made of a first modified activated carbon, which is a modified activated carbon with an adhesive added. The outer layer 11 encloses a hollow structure.

The activated carbon for efficiently adsorbing fluoride in this embodiment further includes a filling layer 12, as shown in Figure 1. The filling layer 12 is filled in the hollow structure enclosed by the outer layer 11, and the filling layer 12 is made of the second modified activated carbon, which is made of modified activated carbon without adding a binder.

It should be noted that the first modified activated carbon is prepared by crushing the activated carbon raw material, adding a quaternary ammonium salt to modify it, and then adding a binder to the modified activated carbon to obtain the first modified activated carbon. Exemplarily, the binder is a phenolic resin. The second modified activated carbon is prepared by crushing the activated carbon raw material, adding a quaternary ammonium salt to modify it, and obtaining the second modified activated carbon.

The processes of crushing the activated carbon raw material, adding quaternary ammonium salt to modify the activated carbon and adding adhesive can adopt the methods in the prior art, which will not be described in detail here.

In some embodiments, at least two opposite outer layers 11 of the activated carbon for efficient fluoride adsorption are provided with openings 13, the openings 13 penetrate in the thickness direction of the outer layer 11, and the openings 13 are connected to the hollow structure formed by the outer layer 11, as shown in FIG1 (the size and structure of the openings 13 are not limited to those shown in FIG1, and the size of the openings 13 can be smaller than the size shown in FIG1). FIG1 shows a schematic diagram of the bottom surface 11a and the top surface 11c of the outer layer 11 of the activated carbon for efficient fluoride adsorption when water flows from bottom to top. When in use, the two sides provided with the openings 13 can be arranged along the direction of water flow, so that the water flow can enter the filling layer 12 from the side provided with the openings 13, and then flow out from the other side provided with the openings 13, as shown in FIG1.

In some embodiments, the opening 13 is a trumpet-shaped structure with one side larger and the other side smaller, as shown in FIG1 . Exemplarily, the aperture of the opening 13 gradually increases from the water inlet side to the water outlet side, thereby reducing the flow rate of water entering the filling layer 12, thereby reducing the impact of the water flow on the filling layer 12, and further reducing the loss of modified activated carbon in the filling layer 12. In some embodiments, the minimum aperture of the opening 13 is smaller than the particle size of the modified activated carbon in the filling layer 12, thereby also avoiding the loss of modified activated carbon in the filling layer 12.

The activated carbon of this embodiment that efficiently adsorbs fluoride is reshaped into a structure in which an outer layer 11 wraps a filling layer 12 after modification, and the outer layer 11 is made of modified activated carbon with added adhesive, and the filling layer 12 is made of modified activated carbon without added adhesive. On the one hand, no adhesive is added to the filling layer 12, so that the modified activated carbon of the filling layer 12 has a larger specific surface area and pore volume to ensure the adsorption efficiency of the filling layer 12; on the other hand, the outer layer 11 can be used to improve the hardness of the activated carbon that efficiently adsorbs fluoride, and at the same time, the loss of the modifier on the modified activated carbon of the filling layer 12 due to water scouring, stirring and the like can be avoided; thirdly, the outer layer 11 is provided with openings 13, which can improve its specific surface area to a certain extent compared with the existing modified activated carbon with added adhesive, thereby also ensuring the adsorption efficiency of the outer layer 11.

That is, the activated carbon of this embodiment that efficiently adsorbs fluoride is improved by reshaping the modified activated carbon into a structure in which the outer layer 11 wraps the filling layer 12, compared with the traditional modified activated carbon, so as to achieve efficient adsorption of fluoride.

This embodiment also provides a device for preparing activated carbon for efficiently adsorbing fluoride.

The device for preparing activated carbon for efficient adsorption of fluoride in this embodiment includes a frame 100, as shown in FIG2. The frame 100 serves as a carrier and is used as a support for the remaining structures. The device for preparing activated carbon for efficient adsorption of fluoride in this embodiment also includes a substrate carrying mechanism 200, a first preparation mechanism 300, a second preparation mechanism 400 and a third preparation mechanism 500. The substrate carrying mechanism 200, the first preparation mechanism 300, the second preparation mechanism 400 and the third preparation mechanism 500 are arranged in sequence, so that the substrate 210 on the substrate carrying mechanism 200 can pass through the first preparation mechanism 300, the second preparation mechanism 400 and the third preparation mechanism 500 in sequence, as shown in FIG2.

In some embodiments, substrates 210 are stacked on the substrate carrying mechanism 200, as shown in FIG2. Specifically, a plurality of substrates 210 are stacked on the substrate carrying mechanism 200 in an orderly manner.

In some embodiments, the first preparation mechanism 300 includes a first mold 310, as shown in Figures 2 and 5. The first mold 310 is slidably arranged along the height direction of the frame 100, the first mold 310 is connected to the first modified activated carbon storage device, and the first mold 310 is used to prepare the bottom surface 11a of the outer layer 11 of the activated carbon on the substrate 210. Exemplarily, the first preparation mechanism 300 also includes a first driving member 320, and the first driving member 320 is used to drive the first mold 310 to slide along the height direction of the frame 100, as shown in Figure 2. Exemplarily, the first driving member 320 is a cylinder. Exemplarily, the first preparation mechanism 300 includes a plurality of first molds 310, and the plurality of first molds 310 can be controlled by one first driving member 320, or independently controlled by a plurality of first driving members 320.

In some embodiments, the second preparation mechanism 400 includes a second mold 410 and a third mold 420, as shown in Figures 2, 6 and 7. The second mold 410 and the third mold 420 are slidably arranged along the height direction of the frame 100, and the third mold 420 is nested in the second mold 410, and a preset gap 430 is retained between the second mold 410 and the third mold 420, as shown in Figure 7. The second mold 410 is connected to the first modified activated carbon storage device, and the second mold 410 is used to prepare the side wall 11b of the outer layer 11 of the activated carbon on the bottom surface 11a. The third mold 420 is connected to the second modified activated carbon storage device, and the third mold 420 is used to prepare the filling layer 12 of the activated carbon on the bottom surface 11a while preparing the side wall 11b.

The gap 430 is the thickness of the side wall 11b of the outer layer 11 of the activated carbon. For example, the gap 430 is 1 mm, 5 mm or 10 mm. However, the gap 430 may also be other sizes.

Exemplarily, the second preparation mechanism 400 further includes a second driving member 450, which is used to simultaneously drive the second mold 410 and the third mold 420 to slide along the height direction of the frame 100, as shown in FIG2. Exemplarily, the second driving member 450 is a cylinder. The second mold 410 and the third mold 420 slide simultaneously along the height direction of the frame 100, which can not only simultaneously prepare the side wall 11b and the filling layer 12 of the activated carbon, improve the preparation efficiency of the activated carbon, but also simplify the structure of the device.

Exemplarily, the second preparation mechanism 400 includes a plurality of second molds 410 and a plurality of third molds 420 , and the plurality of second molds 410 and the plurality of third molds 420 may be controlled by one second driving member 450 , or may be independently controlled by a plurality of second driving members 450 .

In some embodiments, the third preparation mechanism 500 includes a fourth mold 510, as shown in Figures 2 and 8. The fourth mold 510 is slidably arranged along the height direction of the frame 100, and the fourth mold 510 is connected to the first modified activated carbon storage device. The fourth mold 510 is used to prepare the top surface 11c of the outer layer 11 of the activated carbon on the surface of the filling layer 12 and the side wall 11b. Exemplarily, the third preparation mechanism 500 also includes a third driving member 520, and the third driving member 520 is used to drive the fourth mold 510 to slide along the height direction of the frame 100, as shown in Figure 2. Exemplarily, the third driving member 520 is a cylinder. Exemplarily, the third preparation mechanism 500 includes a plurality of fourth molds 510, and the plurality of fourth molds 510 can be controlled by one third driving member 520, or independently controlled by a plurality of third driving members 520.

In some embodiments, the first mold 310, the second mold 410, the third mold 420 and the fourth mold 510 may be square, conical, cylindrical or other structures, but are not limited thereto, and may also be other polyhedral or special-shaped structures. The specific shapes of the first mold 310, the second mold 410, the third mold 420 and the fourth mold 510 may be set based on actual needs. Figures 2, 5 to 8 show schematic diagrams of the first mold 310, the second mold 410, the third mold 420 and the fourth mold 510 being square.

The device of this embodiment can be used to produce activated carbon with an outer layer 11 wrapping a filling layer 12, so that the activated carbon has the characteristic of efficiently adsorbing fluorides. Specifically, the activated carbon produced by the device of this embodiment has an outer layer 11 made of modified activated carbon with an adhesive added, and a filling layer 12 made of modified activated carbon without an adhesive added. On the one hand, the filling layer 12 has no adhesive added, so that the modified activated carbon of the filling layer 12 has a larger specific surface area and pore volume to ensure the adsorption efficiency of the filling layer 12; on the other hand, the outer layer 11 can be used to improve the hardness of the activated carbon with high efficiency in adsorbing fluorides, and at the same time, the loss of the modifier on the modified activated carbon of the filling layer 12 due to water scouring, stirring, etc. can be avoided.

The device of this embodiment for preparing activated carbon with high efficiency in adsorbing fluoride can simultaneously prepare the bottom surface 11a, side wall 11b, filling layer 12 and top surface 11c of the outer layer 11 of activated carbon by using the first preparation mechanism 300, the second preparation mechanism 400 and the third preparation mechanism 500, which is beneficial to improving the preparation efficiency of activated carbon; and the second preparation mechanism 400 can simultaneously prepare the side wall 11b and filling layer 12 of the outer layer 11 of activated carbon, which can also shorten the preparation time of activated carbon and improve its preparation efficiency.

In some embodiments, the first mold 310 includes a first body 311, and the first body 311 is a structure with a hollow interior and an open lower end, as shown in FIG5. Exemplarily, the first body 311 is a structure formed by enclosing a plurality of baffles with one end sealed and one end open. A first feed port 312 is provided on the first body 311, as shown in FIG5. The first feed port 312 is connected to the first modified activated carbon storage device and the first body 311. Exemplarily, the first feed port 312 can be provided on the side of the first body 311, or on the top of the first body 311. Through the first feed port 312, the first modified activated carbon stored in the first modified activated carbon storage device can be transported to the first body 311, and the transport amount of the first modified activated carbon can be controlled based on actual needs, and a first modified activated carbon layer can be formed on the substrate 210, which serves as the bottom surface 11a of the outer layer 11 of the activated carbon that efficiently adsorbs fluorides.

In some embodiments, the first mold 310 further includes a first pressing plate 313, as shown in FIGS. 9 to 12. The first pressing plate 313 is disposed in the first body 311, and the first pressing plate 313 is slidably disposed along the height direction of the first body 311. After the first modified activated carbon is poured into the first body 311, the first modified activated carbon can be compacted by the first pressing plate 313 in this embodiment, so that the structure of the formed first modified activated carbon layer is more compact, so as to enhance the strength of the outer layer 11 of the activated carbon that efficiently adsorbs fluorides.

Exemplarily, the first driving member 320 includes a first cylinder 321 and a second cylinder 322 which are independent of each other, as shown in Fig. 2. The first cylinder 321 is used to drive the first body 311 and the first pressing plate 313 to move synchronously; the second cylinder 322 is used to drive the first pressing plate 313 to move independently.

In some embodiments, a first protrusion 313a is provided at the bottom of the first pressing plate 313, and the size of the first protrusion 313a gradually decreases from the top to the bottom of the first pressing plate 313, as shown in Figures 9 to 12. The size of the first protrusion 313a is not limited to that shown in the figure, and it can be a smaller structure. The height of the first protrusion 313a is greater than or equal to the thickness of the bottom surface 11a. In this embodiment, a first protrusion 313a is provided at the bottom of the first pressing plate 313. In the process of compacting the first modified activated carbon using the first pressing plate 313, an opening 13 can be formed on the bottom surface 11a. The opening 13 is not only conducive to the flow of water into the filling layer 12, but also can increase the specific surface area of the outer layer 11 to a certain extent, thereby ensuring the adsorption efficiency of the activated carbon that efficiently adsorbs fluoride. On the other hand, the structure of the first protrusion 313a can make the formed opening 13 a trumpet-shaped structure with one side large and the other side small, which is beneficial to reducing the flow rate of water entering the filling layer 12, thereby reducing the impact of the water flow on the filling layer 12, and further reducing the loss of modified activated carbon in the filling layer 12.

The first protrusion 313 a is not limited to being provided on the bottom of the first pressing plate 313 , and a protrusion may also be provided on the substrate 210 . The opening 13 may also be formed on the bottom surface 11 a by utilizing the protrusion on the substrate 210 .

In some embodiments, the second mold 410 includes a second body 411, and the second body 411 is a hollow structure, as shown in FIG7. Exemplarily, the second body 411 is a structure formed by a plurality of baffles and sealed at one end and open at the other end. The second body 411 is provided with a second feed port 412, as shown in FIG6. The second feed port 412 is connected to the first modified activated carbon storage device and the second body 411, and the first modified activated carbon can be transported into the second body 411 through the second feed port 412.

The third mold 420 includes a third body 421, which is a hollow structure, as shown in FIG7. Exemplarily, the third body 421 is a structure formed by enclosing a plurality of baffles, with one end sealed and one end open. The third body 421 is nested in the second body 411, and a preset gap 430 is retained between the second body 411 and the third body 421, as shown in FIG7. Exemplarily, the size of the third body 421 is smaller than that of the second body 411, and the third body 421 is arranged in the hollow structure of the second body 411, so that the third body 421 includes a preset gap 430 around the third body 421 and the second body 411. The third body 421 is provided with a third feed port 422, as shown in FIG6. The third feed port 422 is connected to the second modified activated carbon storage device and the third body 421, and the second modified activated carbon can be transported into the third body 421 through the third feed port 422.

In this embodiment, the first modified activated carbon can be delivered to the second body 411 through the second feed port 412, and the second modified activated carbon can be delivered to the third body 421 through the third feed port 422. The delivery amounts of the first modified activated carbon and the second modified activated carbon are controlled based on actual needs, and the side wall 11b and the filling layer 12 of the activated carbon with high efficiency in adsorbing fluoride can be formed on the bottom surface 11a at the same time.

In some embodiments, the second preparation mechanism 400 further includes a cutter assembly 440, which is openably disposed at the opening of the second body 411 and the third body 421, as shown in Figure 6. Exemplarily, the cutter assembly 440 includes a blade 441 and a fourth driving member 442, and the fourth driving member 442 is used to drive the blade 441 to move in the horizontal direction, as shown in Figure 6. Exemplarily, the blade 441 can be one or two pieces, and the opening of the blade 441 is sharp.

Exemplarily, when the first modified activated carbon is transported into the second body 411 and the second modified activated carbon is transported into the third body 421, the blade 441 is moved to a position where the openings of the second body 411 and the third body 421 are opened, so that the first modified activated carbon and the second modified activated carbon can form a side wall 11b and a filling layer 12 on the bottom surface 11a; when the injection amount of the first modified activated carbon and the second modified activated carbon is sufficient, the second body 411 and the third body 421 are moved upward to a preset distance, and the blade 441 is moved to a position where the openings of the second body 411 and the third body 421 are closed, as shown in Figures 13 to 17. The first modified activated carbon and the second modified activated carbon in the second body 411 and the third body 421 can be separated from the first modified activated carbon and the second modified activated carbon outside by the cutter assembly 440, and the end surface of the formed side wall 11b and the filling layer 12 is made flat.

Without limitation, the first modified activated carbon may be transported into the second body 411 in advance, and the second modified activated carbon may be transported into the third body 421. When the second body 411 and the third body 421 are in contact with the bottom surface 11a, the blade 441 is moved to a position where the second body 411 and the third body 421 are opened, and then the second body 411 and the third body 421 are moved to a preset position away from the substrate 210, and then the blade 441 is moved to a position where the second body 411 and the third body 421 are closed, and finally the second body 411 and the third body 421 are moved away from the side wall 11b and the filling layer 12. In some embodiments, the fourth mold 510 includes a fourth body 511, and the fourth body 511 is a structure with a hollow interior and an open lower end, as shown in FIG8. Exemplarily, the fourth body 511 is a structure with one end sealed and one end open formed by a plurality of baffles. The fourth body 511 is provided with a fourth feed port 512, as shown in FIG8. The fourth feed port 512 is connected to the first modified activated carbon storage device and the fourth main body 511. The first modified activated carbon stored in the first modified activated carbon storage device can be transported to the fourth main body 511 through the fourth feed port 512. The delivery amount of the first modified activated carbon is controlled based on actual needs. The top surface 11c of the outer layer 11 of activated carbon that can efficiently adsorb fluoride can be formed on the side wall 11b and the end face of the filling layer 12.

In some embodiments, the fourth mold 510 further includes a second pressing plate 513, which is disposed in the fourth body 511 and is slidably disposed along the height direction of the fourth body 511, as shown in Figures 18 to 21. After the first modified activated carbon is poured into the fourth body 511, the second pressing plate 513 can be used to compact the first modified activated carbon in this embodiment, so that the structure of the formed first modified activated carbon layer is more compact, so as to enhance the strength of the outer layer 11 of the activated carbon that efficiently adsorbs fluorides.

Exemplarily, the third driving member 520 includes a third cylinder 521 and a fourth cylinder 522 which are independent of each other. The third cylinder 521 is used to drive the fourth body 511 and the second pressure plate 513 to move synchronously; the fourth cylinder 522 is used to drive the second pressure plate 513 to move independently, as shown in FIG. 2 .

In some embodiments, a second protrusion 513a is provided at the bottom of the second pressing plate 513, and the size of the second protrusion 513a gradually decreases from the top to the bottom of the second pressing plate 513, as shown in Figures 18 to 21. The structure and function of the second protrusion 513a are the same as those of the first protrusion 313a on the first pressing plate 313, and will not be repeated here.

In some embodiments, the frame 100 is further provided with a transmission mechanism 600, which is used to sequentially transmit the substrate 210 on the substrate carrying mechanism 200 to the first preparation mechanism 300, the second preparation mechanism 400 and the third preparation mechanism 500, as shown in FIG2. Exemplarily, the transmission mechanism 600 includes a transmission belt 610 and a driving device, and the transmission belt 610 can be driven by the driving device to move, thereby realizing the transmission of the substrate 210. Exemplarily, the transmission belt 610 can be operated continuously or intermittently.

In some embodiments, at least two third protrusions 211 are provided on the side of the substrate 210, and the third protrusions 211 are arranged at intervals. Exemplarily, a third protrusion 211 is provided at each of the four corners of the substrate 210, as shown in Figures 2 to 4. A material unloading mechanism 220 is provided on both sides of the substrate carrying mechanism 200, as shown in Figures 2 and 3. Exemplarily, the material unloading mechanism 220 is a spiral material unloading mechanism, and the spacing between two adjacent layers of the spiral material unloading mechanism is set based on the thickness of the substrate 210, so that when the lower substrate 210 is transferred to the unloading station, the third protrusion 211 of the adjacent substrate 210 is just supported by the unloading mechanism 220, thereby avoiding the problem of multiple substrates 210 entering the unloading station at the same time.

In some embodiments, a positioning block 611 is provided on the conveyor belt 610, as shown in FIG2 and FIG4. The spacing between the two third protrusions 211 on the same side of the substrate 210 is the same as the length of the positioning block 611, and the positioning block 611 is used to engage with the substrate 210 for positioning, so that during the transmission of the substrate 210, or when the substrate 210 is located in the first preparation mechanism 300, the second preparation mechanism 400, and the third preparation mechanism 500, the positioning block 611 and the third protrusion 211 can be used to position the substrate 210.

In some embodiments, the device for preparing activated carbon with high efficiency in adsorbing fluoride further includes a product supporting mechanism 700 , and the product supporting mechanism 700 is used for stacking the prepared activated carbon with high efficiency in adsorbing fluoride, as shown in FIG. 2 .

This embodiment also provides a method for preparing activated carbon that efficiently adsorbs fluoride.

The method for preparing activated carbon with high efficiency in adsorbing fluoride in this embodiment is realized by using the device for preparing activated carbon with high efficiency in adsorbing fluoride described in any technical solution in this embodiment.

The method for preparing activated carbon with high efficiency in adsorbing fluoride in this embodiment comprises at least the following steps:

Step S100: preparing a first modified activated carbon and a second modified activated carbon.

Step S200: The substrate 210 on the substrate carrying mechanism 200 is transferred to the bottom of the first mold 310, the first mold 310 moves toward the direction close to the substrate 210 and contacts the surface of the substrate 210, the first modified activated carbon is poured into the first mold 310, and the bottom surface 11a is formed on the substrate 210, as shown in Figures 9 to 12.

Step S300: The substrate 210 obtained in step S200 is transferred to the bottom of the second mold 410 and the third mold 420. The second mold 410 and the third mold 420 move toward the bottom surface 11a and contact the substrate 210 or the bottom surface 11a. The first modified activated carbon is poured into the second mold 410, and the second modified activated carbon is poured into the third mold 420. The side wall 11b and the filling layer 12 are simultaneously formed on the bottom surface 11a, as shown in Figures 13 to 17.

Step S400: The substrate 210 obtained in step S300 is transferred to the bottom of the fourth mold 510. The fourth mold 510 moves toward the filling layer 12 and contacts the filling layer 12 and the upper surface of the side wall 11b. The first modified activated carbon is poured into the fourth mold 510, and a top surface 11c is formed on the surface of the filling layer 12 and the side wall 11b, as shown in Figures 18 to 21.

The specific process of each step of this embodiment can refer to the description of the relevant process in the aforementioned device, which will not be repeated here.

The method of this embodiment can be used to prepare activated carbon with an outer layer 11 wrapping a filling layer 12, so that the activated carbon has the characteristic of efficiently adsorbing fluoride. On the other hand, the method of preparing activated carbon with high efficiency in adsorbing fluoride in this embodiment also has the advantage of shortening the preparation time of activated carbon and improving its preparation efficiency.

In some embodiments, in step S100, preparing the first modified activated carbon comprises the following steps:

The activated carbon substrate is crushed to form activated carbon of a first predetermined particle size. Exemplarily, the activated carbon substrate can be powdered to a desired particle size by mechanical crushing or ball milling.

A quaternary ammonium salt compound solution is prepared, and the crushed activated carbon is immersed in the quaternary ammonium salt compound solution, and the crushed activated carbon is modified by using the quaternary ammonium salt compound, wherein the quaternary ammonium salt compound is 3-chloro-2-hydroxypropyltrimethylammonium chloride and/or 3-chloro-2-hydroxypropyl alkyldimethylammonium chloride.

Add a binder to the modified activated carbon and mix well to obtain the first modified activated carbon. An exemplary binder is phenolic resin.

Specifically, the process of crushing the activated carbon substrate, modifying the crushed activated carbon, and mixing the adhesive with the modified activated carbon may be a method in the prior art, which will not be described in detail here.

After the activated carbon raw material is crushed, quaternary ammonium salt is added to modify it, and then a binder is added to the modified activated carbon to obtain a first modified activated carbon. The first modified activated carbon is used as a raw material to reshape the outer layer 11 of the activated carbon. Since the binder is added, the hardness of the reshaped activated carbon can be increased.

In some embodiments, in step S100, preparing the second modified activated carbon comprises the following steps:

The activated carbon substrate is crushed to form activated carbon of a second predetermined particle size, wherein the second predetermined particle size is larger than the first predetermined particle size. Exemplarily, the activated carbon substrate can be powdered to a desired particle size by mechanical crushing or ball milling.

A quaternary ammonium salt compound solution is prepared, and the crushed activated carbon is immersed in the quaternary ammonium salt compound solution, and the crushed activated carbon is modified by using the quaternary ammonium salt compound, wherein the quaternary ammonium salt compound is 3-chloro-2-hydroxypropyltrimethylammonium chloride and/or 3-chloro-2-hydroxypropyl alkyldimethylammonium chloride, to obtain a second modified activated carbon.

Specifically, the process of crushing the activated carbon substrate and modifying the crushed activated carbon may be a method in the prior art, which will not be described in detail here.

After the activated carbon raw material is crushed, a quaternary ammonium salt is added to modify it to obtain a second modified activated carbon. The second modified activated carbon is used as a raw material and reshaped into a filling layer 12, so that the reshaped activated carbon has a structure in which the outer layer 11 wraps the filling layer 12. No adhesive is added to the filling layer 12, so that the modified activated carbon of the filling layer 12 has a larger specific surface area and pore volume, which can ensure the adsorption efficiency of the filling layer 12; at the same time, the wrapping of the outer layer 11 can avoid the loss of the modifier on the modified activated carbon of the filling layer 12 due to water scouring, stirring, etc., and the adsorption efficiency of the outer layer 11 can also be ensured.

In some embodiments, the preparation of the first modified activated carbon and the second modified activated carbon further comprises the following steps: after modifying the crushed activated carbon, the modified activated carbon is fully washed and dried to remove unreacted modifiers and impurities.

In some embodiments, in step S200, after pouring the first modified activated carbon into the first mold 310, the following steps are also included: controlling the first pressing plate 313 to move in a direction close to the substrate 210, using the first pressing plate 313 to compact the first modified activated carbon, and using the first protrusion 313a on the first pressing plate 313 to form a plurality of openings 13 on the bottom surface 11a, as shown in Figures 10 to 12. Exemplarily, the pressure applied to the first pressing plate 313 can be determined based on actual conditions. Through the above process, not only can the bottom surface 11a of the reshaped activated carbon be made more compact to enhance the strength of the outer layer 11 of the activated carbon that efficiently adsorbs fluorides, but also openings 13 can be formed on the bottom surface 11a to facilitate water flow into or out of the filling layer 12, and the specific surface area of the outer layer 11 can also be increased.

In some embodiments, in step S300, before pouring the first modified activated carbon into the second mold 410 and pouring the second modified activated carbon into the third mold 420, the following step is also included: sliding the cutter assembly 440 to a position where the openings of the second body 411 and the third body 421 are opened, so that the first modified activated carbon and the second modified activated carbon can form a side wall 11b and a filling layer 12 on the bottom surface 11a, as shown in Figure 14.

After pouring the first modified activated carbon into the second mold 410 and the second modified activated carbon into the third mold 420, the following steps are also included: controlling the second body 411 and the third body 421 to move away from the substrate 210, and controlling the cutter assembly 440 to slide to a position where the openings of the second body 411 and the third body 421 are closed, so that the first modified activated carbon and the second modified activated carbon in the second body 411 and the third body 421 can be separated from the first modified activated carbon and the second modified activated carbon outside, and the formed side wall 11b and the end face of the filling layer 12 are made smooth, as shown in Figure 16.

In some embodiments, in step S400, after pouring the first modified activated carbon into the fourth mold 510, the following steps are also included: controlling the second pressing plate 513 to move in a direction close to the substrate 210, using the second pressing plate 513 to compact the first modified activated carbon, and using the second protrusion 513a on the second pressing plate 513 to form a plurality of openings 13 on the top surface 11c, as shown in Figures 19 and 21. Exemplarily, the pressure applied to the second pressing plate 513 can be determined based on actual conditions. Through the above process, not only can the top surface 11c of the reshaped activated carbon be made more compact to enhance the strength of the outer layer 11 of the activated carbon that efficiently adsorbs fluoride, but also openings 13 can be formed on the top surface 11c to facilitate water flow into or out of the filling layer 12, and the specific surface area of the outer layer 11 can also be increased.

It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims (10)

1. The device for preparing the active carbon for efficiently adsorbing the fluoride is characterized by comprising a frame (100), wherein a substrate bearing mechanism (200), a first preparation mechanism (300), a second preparation mechanism (400) and a third preparation mechanism (500) are sequentially arranged on the frame (100),

A substrate (210) is stacked on the substrate bearing mechanism (200);

The first preparation mechanism (300) comprises a first die (310), the first die (310) is slidably arranged along the height direction of the frame (100), the first die (310) is communicated with a first modified activated carbon storage device, and the first die (310) is used for preparing the bottom surface (11 a) of the outer layer (11) of activated carbon on the substrate (210);

The second preparation mechanism (400) comprises a second die (410) and a third die (420), the second die (410) and the third die (420) are slidably arranged along the height direction of the frame (100), the third die (420) is nested in the second die (410), a preset gap (430) is reserved between the second die (410) and the third die (420),

The second mould (410) is communicated with the first modified activated carbon storage device, the second mould (410) is used for preparing the side wall (11 b) of the outer layer (11) of activated carbon on the bottom surface (11 a),

The third mould (420) is communicated with a second modified activated carbon storage device, and the third mould (420) is used for preparing a filling layer (12) of activated carbon on the bottom surface (11 a) at the same time when preparing the side wall (11 b);

The third preparation mechanism (500) comprises a fourth die (510), wherein the fourth die (510) is slidably arranged along the height direction of the frame (100), the fourth die (510) is communicated with a first modified activated carbon storage device, and the fourth die (510) is used for preparing the top surface (11 c) of the outer layer (11) of activated carbon on the surfaces of the filling layer (12) and the side wall (11 b); wherein,

The first modified activated carbon storage device is used for storing first modified activated carbon, and the first modified activated carbon is modified activated carbon added with an adhesive;

the second modified activated carbon storage device is used for storing second modified activated carbon, and the second modified activated carbon is modified activated carbon without an adhesive.

2. The apparatus for preparing activated carbon for efficient adsorption of fluoride according to claim 1, wherein the first mold (310) comprises a first body (311), the first body (311) has a structure with a hollow interior and an open lower end, a first feed inlet (312) is provided on the first body (311), and the first feed inlet (312) is communicated with a first modified activated carbon storage device and the first body (311);

The first die (310) further comprises a first pressing plate (313), the first pressing plate (313) is arranged in the first body (311), the first pressing plate (313) is slidably arranged along the height direction of the first body (311), a first protruding block (313 a) is arranged on the bottom surface of the first pressing plate (313), and the size of the first protruding block (313 a) gradually decreases from the top to the bottom of the first pressing plate (313).

3. The apparatus for preparing activated carbon for efficient adsorption of fluoride according to claim 1, wherein the second mold (410) comprises a second body (411), the second body (411) is of a hollow structure, a second feed port (412) is provided on the second body (411), and the second feed port (412) is communicated with a first modified activated carbon storage device and the second body (411);

The third die (420) comprises a third body (421), the third body (421) is of a hollow structure, the third body (421) is nested in the second body (411), a preset gap (430) is reserved between the second body (411) and the third body (421), a third feed inlet (422) is formed in the third body (421), and the third feed inlet (422) is communicated with the second modified activated carbon storage device and the third body (421);

the second preparation mechanism (400) further comprises a cutter assembly (440), and the cutter assembly (440) is arranged at the opening of the second body (411) and the opening of the third body (421) in an openable and closable manner.

4. The apparatus for preparing activated carbon for efficient adsorption of fluoride according to claim 1, wherein the fourth mold (510) comprises a fourth body (511), the fourth body (511) is of a structure with a hollow interior and an open lower end, a fourth feed inlet (512) is provided on the fourth body (511), and the fourth feed inlet (512) is communicated with the first modified activated carbon storage apparatus and the fourth body (511);

The fourth die (510) further comprises a second pressing plate (513), the second pressing plate (513) is arranged in the fourth body (511), the second pressing plate (513) is slidably arranged along the height direction of the fourth body (511), a second protruding block (513 a) is arranged on the bottom surface of the second pressing plate (513), and the size of the second protruding block (513 a) gradually decreases from the top to the bottom of the second pressing plate (513).

5. The apparatus for preparing activated carbon highly effective in adsorbing fluoride according to any one of claims 1 to 4, characterized in that a transporting mechanism (600) is further provided on the frame (100), the transporting mechanism (600) being configured to sequentially transport the substrate (210) on the substrate carrying mechanism (200) to the first preparing mechanism (300), the second preparing mechanism (400) and the third preparing mechanism (500);

The conveying mechanism (600) comprises a conveying belt (610) and a driving device, a positioning block (611) is arranged on the conveying belt (610), at least two third protruding blocks (211) are arranged on the side face of the substrate (210), the third protruding blocks (211) are arranged at intervals, the distance between every two adjacent third protruding blocks (211) is the same as the length of the positioning block (611), and the positioning block (611) is used for being clamped and positioned with the substrate (210).

6. A method for preparing activated carbon for efficient adsorption of fluoride, characterized in that the method is implemented using the apparatus for preparing activated carbon for efficient adsorption of fluoride according to any one of claims 1 to 5, and the method comprises at least the steps of:

step S100: preparing first modified activated carbon and second modified activated carbon, wherein the first modified activated carbon is modified activated carbon added with an adhesive, and the second modified activated carbon is modified activated carbon not added with an adhesive;

Step S200: transferring a substrate (210) on a substrate bearing mechanism (200) to the lower part of a first mould (310), wherein the first mould (310) moves towards the direction approaching to the substrate (210) and contacts with the surface of the substrate (210), and first modified activated carbon is poured into the first mould (310) and a bottom surface (11 a) is formed on the substrate (210);

Step S300: transferring the substrate (210) obtained in the step S200 to the lower parts of a second mold (410) and a third mold (420), wherein the second mold (410) and the third mold (420) move towards the direction close to the bottom surface (11 a) and are in contact with the substrate (210) or the bottom surface (11 a), first modified activated carbon is poured into the second mold (410), second modified activated carbon is poured into the third mold (420), and a side wall (11 b) and a filling layer (12) are simultaneously formed on the bottom surface (11 a);

Step S400: and (2) conveying the substrate (210) obtained in the step (S300) to the lower part of a fourth mould (510), wherein the fourth mould (510) moves towards the direction close to the filling layer (12) and contacts with the upper surfaces of the filling layer (12) and the side walls (11 b), the first modified activated carbon is poured into the fourth mould (510), and the top surface (11 c) is formed on the surfaces of the filling layer (12) and the side walls (11 b).

7. The method for preparing activated carbon for efficient fluoride adsorption according to claim 6, wherein in step S100, preparing the first modified activated carbon comprises the steps of:

Crushing the activated carbon substrate and forming activated carbon of a first preset particle size;

Preparing a quaternary ammonium salt compound solution, immersing crushed active carbon into the quaternary ammonium salt compound solution, and modifying the crushed active carbon by using a quaternary ammonium salt compound, wherein the quaternary ammonium salt compound is 3-chloro-2-hydroxypropyl trimethylammonium chloride and/or 3-chloro-2-hydroxypropyl alkyl dimethyl ammonium chloride;

Adding an adhesive into the modified activated carbon, and uniformly mixing to obtain first modified activated carbon;

In step S100, the preparation of the second modified activated carbon includes the steps of:

Crushing the activated carbon substrate and forming activated carbon of a second predetermined particle size, the second predetermined particle size being greater than the first predetermined particle size;

Preparing a quaternary ammonium salt compound solution, immersing the crushed activated carbon into the quaternary ammonium salt compound solution, and modifying the crushed activated carbon by using a quaternary ammonium salt compound, wherein the quaternary ammonium salt compound is 3-chloro-2-hydroxypropyl trimethylammonium chloride and/or 3-chloro-2-hydroxypropyl alkyl dimethyl ammonium chloride, so as to obtain second modified activated carbon.

8. The method for preparing activated carbon capable of efficiently adsorbing fluoride according to claim 6, further comprising the steps of, after pouring first modified activated carbon into the first mold (310), in step S200:

the first pressing plate (313) is controlled to move towards the direction approaching to the substrate (210), the first modified activated carbon is compacted by the first pressing plate (313), and a plurality of openings (13) are formed on the bottom surface (11 a) by the first protruding blocks (313 a) on the first pressing plate (313).

9. The method for preparing activated carbon capable of efficiently adsorbing fluoride according to claim 6, further comprising the step of, before pouring first modified activated carbon into the second mold (410) and pouring second modified activated carbon into the third mold (420), pouring the first modified activated carbon into the third mold (420): sliding the cutter assembly (440) to a position where the openings of the second body (411) and the third body (421) are open;

The method further comprises the following steps after pouring the first modified activated carbon into the second mold (410) and pouring the second modified activated carbon into the third mold (420): controlling the second body (411) and the third body (421) to move away from the substrate (210) and controlling the cutter assembly (440) to slide to a position where the openings of the second body (411) and the third body (421) are closed.

10. The method for preparing activated carbon capable of efficiently adsorbing fluoride according to claim 6, further comprising the steps of, after pouring the first modified activated carbon into the fourth mold (510), in step S400:

And controlling the second pressing plate (513) to move towards the direction approaching to the substrate (210), compacting the first modified activated carbon by using the second pressing plate (513), and forming a plurality of openings (13) on the top surface (11 c) by using the second protruding blocks (513 a) on the second pressing plate (513).