Apparatus and Method for Preparing Continuously Graded Aggregates for Concrete Based on Gas-Liquid Displacement

Abstract

The embodiment of the present invention discloses a device and method for preparing continuous graded aggregate of concrete based on gas-liquid displacement. The preparation device includes a material displacement bearing structure, a propulsion structure, and a collection bin. The material displacement bearing structure includes a material displacement bin with a cavity formed along the direction from the feed end to the discharge end, a piston in the movable sealing material displacement bin close to the feed end, and a burst-proof plate in the fixed sealing material displacement bin close to the discharge end. When the piston is in the initial state, the area between the piston and the burst-proof plate in the material displacement bin forms a material bearing section. The material bearing section is also connected to a displacement assembly, which is used to alternately displace gas and liquid in the material bearing section and make the pressure in the material bearing section reach a preset value. The propulsion structure is used to provide a driving force to the piston. The collection bin separates and aggregates the materials. The coarse and fine aggregate mixture produced in the above manner has few defects, high monomer strength, irregular surface, and good particle gradation.

Description

Technical Field

[0001] This invention relates to the field of concrete processing technology, specifically to an apparatus and method for preparing continuous graded aggregates for concrete based on gas-liquid displacement. Background Technology

[0002] Conventional concrete mix design consists of coarse aggregate and fine aggregate. Coarse aggregate refers to stones with a particle size greater than 5mm and less than 25mm, while fine aggregate refers to sand with a particle size greater than 0.15mm and less than 5mm. Generally, concrete is prepared by mixing coarse and fine aggregates in a certain proportion, then adding cement and water at a specific water-cement ratio, with the addition of water-reducing agents, etc., to prepare concrete of different grades.

[0003] However, in actual mix design, the particle size distribution of coarse and fine aggregates is discontinuous; there are only 5mm particle size limits, and no specific requirements are placed on the internal particle size ratio of coarse and fine aggregates. Under these circumstances, it is very easy to make it difficult to control the quality during concrete mix design. Summary of the Invention

[0004] Therefore, embodiments of the present invention provide an apparatus and method for preparing continuous graded aggregates for concrete based on gas-liquid displacement, which can achieve optimal gradation of coarse and fine aggregates and is simple to operate. After a one-step mixing operation, the resulting mixture can be directly used in the preparation of concrete without the need for additional coarse and fine aggregate proportioning, thus effectively ensuring the stability of the final concrete quality.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] In one aspect of this invention, an apparatus for preparing continuous graded aggregate for concrete based on gas-liquid displacement is provided, comprising a material displacement bearing structure, a propulsion structure connected to the feed end side of the material displacement bearing structure, and a collection bin connected to the discharge end side of the material displacement bearing structure; wherein...

[0007] The material displacement bearing structure includes a material displacement chamber with a cavity formed through it in the direction from the feed end to the discharge end, a piston in the material displacement chamber near the feed end is movably sealed, and an explosion-proof sheet in the material displacement chamber near the discharge end is fixedly sealed.

[0008] When the piston is in the initial state, the area between the piston and the explosion-proof plate in the material displacement chamber is formed as a material carrying section.

[0009] The propulsion structure is used to provide a driving force to the piston;

[0010] The collection bin is used to sort and collect materials.

[0011] As a preferred embodiment of the present invention, the material carrying section is further connected to a displacement component, which is used to perform gas-liquid alternating displacement on the material carrying section and make the pressure in the material carrying section reach a preset value.

[0012] The displacement assembly includes at least a medium supply unit connected to the side of the material carrying section near the piston, and a medium discharge unit connected to the side of the material carrying section near the explosion-proof plate; and,

[0013] The medium supply unit is capable of alternately supplying liquid and gas to the material carrying section.

[0014] In a preferred embodiment of the present invention, the medium supply unit includes at least a medium inlet, an on / off control valve, a first pressure detection element, and a medium supply element sequentially connected to the material carrying section; wherein...

[0015] The medium supply device includes a water pump and an air compressor connected in parallel to the first pressure detection device.

[0016] As a preferred embodiment of the present invention, the propulsion structure includes at least an air chamber connected to one side of the feed end via a high-pressure pipe, and a high-pressure gas supply unit for supplying high-pressure gas to the air chamber.

[0017] As a preferred embodiment of the present invention, the high-pressure gas supply unit includes a control valve, a second pressure detection element, and a high-pressure gas pump sequentially connected to the air inlet of the gas chamber;

[0018] The gas source connected to the high-pressure gas pump is nitrogen.

[0019] As a preferred embodiment of the present invention, the material displacement chamber is further open on the side of the explosion-proof plate opposite to the piston, forming an air outlet and a material outlet, and the collection chamber is arranged to surround the air outlet and the material outlet.

[0020] In a preferred embodiment of the present invention, the collection bin is sequentially formed into multiple collection sections from one end near the material displacement bin to the end away from the material displacement bin, and adjacent collection sections are separated by a screening plate; and...

[0021] The mesh size of the plurality of screening plates gradually decreases from one end near the material displacement bin to the end away from the material displacement bin;

[0022] Each of the aforementioned material collection sections is connected to a discharge port that can be opened or closed.

[0023] As a preferred embodiment of the present invention, an air suction component is further provided at the end of the collection chamber away from the material displacement chamber, and the air suction end of the air suction component faces the end where the material displacement chamber is located.

[0024] In another aspect of the present invention, a method for preparing continuous graded aggregate for concrete based on gas-liquid displacement is also provided, employing the preparation apparatus described above, the preparation method comprising:

[0025] S100. Load the material to be mixed into the material displacement bearing structure and seal the material to be mixed using a piston and explosion-proof disc.

[0026] S200, one of the open displacement components, introduces a gaseous displacement medium into the material displacement support structure;

[0027] S300, Close one part of the displacement assembly, open the other part of the displacement assembly, and introduce liquid displacement medium into the material displacement support structure until the pressure in the material displacement support structure reaches the preset value.

[0028] S400, the outlet of the displacing medium on the open material displacing support structure is used to displace the gas displacing medium with liquid displacing medium.

[0029] The S500 features a rupture-proof diaphragm and a propulsion structure that provides the driving force to propel the piston, causing the materials to be mixed during movement. After being sorted by the collection bin, the materials are remixed to complete the collection of the mixture.

[0030] In a preferred embodiment of the present invention, in step S200, the gas displacement medium is compressed air with a pressure of 14.1-14.5 MPa.

[0031] As a preferred embodiment of the present invention, the preset value in step S300 is 14.3-14.8 MPa.

[0032] As a preferred embodiment of the present invention, the collection bin is formed into a plurality of material collection sections separated by a screening plate, and the discharge port of each material collection section can be opened or closed.

[0033] Before step S500, the process further includes opening or closing the discharge ports of the multiple collection sections in the collection bin according to preset conditions, and the remixed mixture is selected from the collection section with the discharge port in the open position.

[0034] The embodiments of the present invention have the following advantages:

[0035] Based on the above technical solution, this invention provides a one-time preparation of continuously graded limestone coarse and fine aggregates to replace gravel and graded sand. This method eliminates the need to purchase river sand or premix according to the gradation requirements of the coarse and fine aggregates during concrete preparation. Instead, only a single type of gravel is needed, prepared according to an appropriate water-cement ratio, to complete concrete preparation. Furthermore, the final concrete quality is stable, effectively ensuring the uniformity and stability of each batch. Attached Figure Description

[0036] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0037] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0038] Figure 1 This is a schematic diagram of the preparation apparatus provided in an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of the collection chamber provided in an embodiment of the present invention;

[0040] Figure 3 A flowchart illustrating a specific preparation method provided in this embodiment of the invention;

[0041] Figure 4 The curves showing the change of concrete compressive strength over time under different aggregate ratios;

[0042] Figure 5 This is a particle size distribution diagram of the material discharged from the collection bin under different parameters provided in an embodiment of the present invention.

[0043] In the picture:

[0044] 1-Material displacement support structure; 2-Propulsion structure; 3-Collection bin; 4-Displacement component;

[0045] 11-Feed end; 12-Discharge end; 13-Material displacement bin; 14-Piston; 15-Explosion-proof disc; 16-Air outlet; 17-Discharge outlet; 18-Medication pack;

[0046] 21-High-pressure pipe; 22-Gas chamber; 23-Air inlet; 24-Control valve; 25-Second pressure detection element; 26-High-pressure air pump; 27-Air source;

[0047] 31-Collection section; 32-Screening plate; 33-Discharge port; 34-Suction assembly;

[0048] 41-Media inlet; 42-On / off control valve; 43-First pressure detection element; 44-Water pump; 45-Air compressor; 46-Media discharge unit. Detailed Implementation

[0049] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] like Figure 1 As shown, the present invention provides a device for preparing continuous graded aggregate for concrete based on gas-liquid displacement, specifically including a material displacement bearing structure 1, a propulsion structure 2, a collection bin 3, and a displacement component 4.

[0052] The material displacement chamber 13 in the material displacement bearing structure 1 is equipped with a medium inlet 41 (for liquid or gas medium), a feed end 11, a medium discharge unit 46 (specifically, a displacement medium outlet), an air outlet 16, and a discharge outlet 17 located on one side of the discharge end 12. Limestone is loaded into the material displacement chamber 13 through the feed end 11, so that air in the material displacement chamber 13 permeates into the material to be mixed (e.g., limestone). A medium supply unit is provided on one side of the material displacement chamber 13, through which high-pressure air is introduced into the material displacement chamber 13. Then, water is injected into the material displacement chamber 13 through a water pump 44 to start displacement. Finally, the high-pressure air in a free state between the limestone particles is discharged through the displacement medium outlet on the material displacement chamber 13.

[0053] In a specific embodiment of the present invention, the medium supply unit may specifically include: an on / off control valve 42 for adjusting the air and water flow rates, sequentially disposed outside the medium inlet 41; a first pressure detection element 43 (which may be specifically selected as a pressure gauge) for displaying the pressure value inside the material displacement chamber 13 in real time; an air compressor 45 for providing high-pressure air; and a water pump 44 for providing high-pressure water.

[0054] like Figure 1 As shown, one end of the material displacement chamber 13 is connected to the gas chamber 22 via a high-pressure pipe 21. A piston 14 is installed at the end of the material displacement chamber 13. A high-pressure gas supply unit is connected to an air inlet 23 located at one end of the gas chamber 22 to introduce high-pressure gas into the gas chamber 22. Furthermore, multiple sealing rings can be fitted onto the piston 14 to better isolate the material displacement chamber 13 and the gas chamber 22. At the same time, it can ensure that the propulsion structure 2 can propel the limestone and water in the material displacement chamber 13 as a whole using high-pressure gas and the piston 14.

[0055] The high-pressure gas supply unit specifically includes: a control valve 24 arranged sequentially outside the air inlet 23 for adjusting the filling speed of high-pressure gas in the gas chamber 22; a second pressure detection element 25 (which can be a pressure gauge) for displaying the pressure value inside the gas chamber 22; a high-pressure gas pump 26 for supplying high-pressure gas; and a gas source 27. The gas source 27 can specifically include a gas cylinder and a 0.8MPa driving gas source, wherein the 0.8MPa driving gas source is used to pressurize the high-pressure gas pump 26. In this embodiment, the gas provided by the gas cylinder is N2.

[0056] In this embodiment, water is filled into the material displacement chamber 13 by the displacement component 4, so that the first pressure detection element 43 installed on the material displacement chamber 13 is always maintained at 14.1-14.5MPa. Under this pressure condition, the free air between the ore is discharged through the displacement medium outlet.

[0057] In this embodiment, a piston 14 is also provided between the gas chamber 22 and the material displacement chamber 13. The explosion-proof plate 15 is 3mm thick and 68mm in diameter, which is larger than the inner diameter of the material displacement chamber 13, and is used to seal the material displacement chamber 13. At the same time, an explosive charge 18 is attached to the explosion-proof plate 15. After the explosive charge 18 is activated, the explosion-proof plate 15 breaks, and the limestone is unloaded under high pressure and becomes well-graded coarse and fine aggregates, which enter the coarse and fine aggregate collection chamber 3 through the discharge port 17 and the air outlet 16.

[0058] In actual operation, the materials discharged from outlet 17 and outlet 16 need to be further sorted before collection and use. In a more preferred embodiment of the present invention, such as... Figure 2As shown, the collection bin 3 is further configured such that, specifically, the collection bin 3 is sequentially formed into multiple collection sections 31 from one end near the material displacement bin 13 to the end away from the material displacement bin 13, and adjacent collection sections 31 are separated by a screening plate 32; and,

[0059] The sieve holes of the plurality of sieve plates 32 gradually decrease from one end near the material displacement bin 13 to the end away from the material displacement bin 13;

[0060] Each of the aforementioned material collection sections 31 is connected to a discharge port 33 that can be opened or closed.

[0061] Through the above settings, the output material can be sorted. Since the sieve openings of the multiple screening plates 32 gradually decrease, the particle size of the material collected in multiple adjacent collection sections 31 gradually decreases, thereby achieving continuous gradation screening. Furthermore, by controlling the opening or closing of the discharge ports 33 on each collection section 31, the material in the corresponding collection section 31 can be selectively collected and mixed. For example, when continuously graded material is needed, the discharge ports 33 of multiple adjacent collection sections 31 are all open; when collecting secondary graded material, the discharge ports 33 of the collection sections 31 are opened in a skipping manner (skipping frequency one); when collecting tertiary graded material, the discharge ports 33 of the collection sections 31 are opened in a skipping manner (skipping frequency two); and so on.

[0062] Furthermore, in order to enable the material to be transported further and to achieve better grading and screening, an air suction component 34 is also provided at the end of the collection bin 3 that is away from the material displacement bin 13, and the air suction end of the air suction component 34 faces the end where the material displacement bin 13 is located.

[0063] This invention also provides a method for preparing continuously graded aggregate for concrete based on gas-liquid displacement, using the aforementioned preparation apparatus, the specific process of which includes:

[0064] Step S100: Groove is cut on the end face of the hopper (i.e., material displacement hopper 13) and a sealing ring is placed. Grease is applied to fix the sealing ring. The explosion-proof sheet 15 with the medicine bag 18 is placed on the sealing ring and the end cap with the inner arc surface is installed.

[0065] Step S200: Load limestone into the silo and install the silo end cap;

[0066] Step S300: Introduce 14MPa compressed air into the silo to allow the air to fully penetrate the limestone (i.e., the material to be mixed);

[0067] Step S400: Turn on the liquid drive module (i.e., the displacement component 4). When the pressure in the silo is maintained at 14.1-14.5MPa, open the medium discharge unit 46 (specifically, it can be an air outlet structure located on the silo) to perform displacement and discharge the compressed air in a free state between the limestone.

[0068] In step S400, when the needle valve at the liquid inlet (i.e., medium inlet 41) begins to flow steadily, the high-pressure liquid valve and the needle valve are closed. It should be noted that before activating the liquid drive module, the limestone and compressed air can be allowed to stand for a period of time, for example, 2-3 minutes, to allow for saturation and permeation. Simultaneously, the pressure inside the silo is maintained at 14.3-14.8 MPa, primarily to ensure it is slightly higher than the initial 14 MPa inflation pressure. This allows the free air between the ore particles to escape from the silo, retaining only a small amount of gas deep within the limestone.

[0069] Step S500: Turn on the gas drive module (i.e., the high-pressure gas supply unit). When the pressure in the gas chamber is equal to the pressure in the material hopper, turn off the gas drive module.

[0070] In step S500, when the pressure gauge reading is equal to the pressure in the silo, the high-pressure gas valve is closed, and the drive gas source and high-pressure air pump system are shut down.

[0071] Step S600: The explosive charge 18 is ignited by the detonator, which causes the explosion-proof plate 15 to rupture, and the high-pressure gas pushes the limestone away from the silo and is ejected at high speed through the discharge port 17.

[0072] During this process, limestone and water are sprayed out of the silo. The limestone will collide with the inner arc-shaped end cap and be discharged from the discharge port 17, thus obtaining well-graded limestone coarse aggregate.

[0073] To ensure a more advantageous gradation of the final sprayed limestone aggregate, steps S300 and S400 can be repeated alternately. Only the pressure of the liquid and gaseous media needs to reach the aforementioned value during the final repetition. Previous pressures should be lower than this value, gradually increasing during the progressive steps.

[0074] In the material collection process, the present invention further introduces a collection unit 31 as mentioned above, which can sort and collect materials, perform specific grading as needed, and directly grade and mix the materials according to preset grading requirements after discharge.

[0075] This invention provides an apparatus and method for preparing continuously graded aggregates for concrete based on gas-liquid displacement. Based on this apparatus and method, the inventors conducted numerous coarse and fine aggregate preparation experiments and concrete strength experiments with different coarse and fine aggregate ratios. According to the strength of concrete test blocks after different curing times of 3 days, 7 days, 14 days, and 28 days, a set of ideal coarse and fine aggregate gradations was obtained. Specific results are as follows... Figure 4 As shown.

[0076] Specifically, the achievable particle size distribution is as follows: Figure 5 As shown, the concrete produced using a three-stage gradation method exhibits better performance than discontinuous gradation and is even better than continuous gradation. Therefore, based on the technical solution of this invention, there is no need to specifically purchase different raw materials. Instead, any aggregate can be directly placed into the preparation device of this invention. After discharge, the discharge port 33 of the three-stage gradation method is controlled for preparation, thus forming suitable concrete raw materials in one go. This greatly improves the utilization rate of conventional aggregates and reduces concrete production costs. Furthermore, the concrete obtained based on the technical solution of this application has relatively more stable quality. There are no requirements for raw materials; any aggregate can be used directly to ensure the quality of the final concrete. Its curing time and strength are as follows... Figure 4 As shown in Table 1, the specific values ​​are as follows. It can be seen that the concrete produced from a simple continuous gradation mix has lower strength than that from a discontinuous gradation mix or a three-gradation mix. Therefore, the technical solution of this application proposes a method that does not have significant requirements for raw materials, yet produces concrete that can guarantee its performance.

[0077] Table 1

[0078]

[0079] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A device for preparing continuous graded aggregate for concrete based on gas-liquid displacement, characterized in that, It includes a material displacement bearing structure (1), a propulsion structure (2) connected to the feed end (11) of the material displacement bearing structure (1), and a collection bin (3) connected to the discharge end (12) of the material displacement bearing structure (1); wherein, The material displacement bearing structure (1) includes a material displacement chamber (13) with a cavity formed through it in the direction from the feed end (11) to the discharge end (12), a piston (14) in the material displacement chamber (13) near the feed end (11) is movably sealed, and an explosion-proof sheet (15) in the material displacement chamber (13) near the discharge end (12) is fixedly sealed. When the piston (14) is in the initial state, the area between the piston (14) and the explosion-proof plate (15) in the material displacement chamber (13) is formed as a material carrying section; The propulsion structure (2) is used to provide a driving force to the piston (14); The collection bin (3) is used to sort and collect materials; The material displacement chamber (13) is provided with a medium inlet (41), and a medium supply unit is provided on one side of the material displacement chamber (13); The material carrying section is also connected to a displacement component (4), which is used to perform gas-liquid alternating displacement on the material carrying section and make the pressure in the material carrying section reach a preset value. The displacement assembly (4) includes a medium supply unit, which includes an on / off control valve (42) for adjusting the air and water flow speed, a first pressure detection element (43) for displaying the pressure value inside the material displacement chamber (13) in real time, an air compressor (45) for providing high-pressure air, and a water pump (44) for providing high-pressure water. The medium supply unit can alternately supply liquid and gas to the material carrying section. During the alternation process, the pressure of the liquid is greater than the pressure of the gas each time. During the alternation process, the pressure of the gas gradually increases until the gas pressure is 14.1-14.5 MPa and the liquid pressure is 14.3-14.8 MPa.

2. The apparatus for preparing continuous graded aggregate for concrete based on gas-liquid displacement according to claim 1, characterized in that, The material carrying section is also connected to a displacement component (4), which is used to perform gas-liquid alternating displacement on the material carrying section and make the pressure in the material carrying section reach a preset value. The displacement assembly (4) includes at least a medium supply unit connected to the side of the material carrying section near the piston (14), and a medium discharge unit (46) connected to the side of the material carrying section near the explosion-proof plate (15).

3. The apparatus for preparing continuous graded aggregate for concrete based on gas-liquid displacement according to claim 1 or 2, characterized in that, The propulsion structure (2) includes at least a gas chamber (22) connected to one side of the feed end (11) via a high-pressure pipe (21), and a high-pressure gas supply unit for supplying high-pressure gas to the gas chamber (22); wherein, The high-pressure gas supply unit includes a control valve (24), a second pressure detection element (25), and a high-pressure gas pump (26) sequentially connected from the air inlet (23) of the gas chamber (22); The gas source (27) connected to the high-pressure gas pump (26) is nitrogen.

4. The apparatus for preparing continuous graded aggregate for concrete based on gas-liquid displacement according to claim 1 or 2, characterized in that, The material displacement chamber (13) is also open on the side of the explosion-proof plate (15) away from the piston (14) to form an air outlet (16) and a material outlet (17), and the collection chamber (3) is arranged to surround the air outlet (16) and the material outlet (17).

5. The apparatus for preparing continuous graded aggregate for concrete based on gas-liquid displacement according to claim 1 or 2, characterized in that, The collection bin (3) is sequentially formed into multiple collection sections (31) from one end near the material displacement bin (13) to the end away from the material displacement bin (13), and adjacent collection sections (31) are separated by a screening plate (32); and, The sieve holes of the plurality of sieve plates (32) gradually decrease from one end near the material displacement bin (13) to the end away from the material displacement bin (13); Each of the aforementioned collection sections (31) is connected to a discharge port (33) that can be opened or closed.

6. The apparatus for preparing continuous graded aggregate for concrete based on gas-liquid displacement according to claim 5, characterized in that, An air suction component (34) is also provided at one end of the collection chamber (3) away from the material displacement chamber (13), with the suction end of the air suction component (34) facing the end where the material displacement chamber (13) is located.

7. A method for preparing continuously graded aggregate for concrete based on gas-liquid displacement, characterized in that, The preparation method, using the preparation apparatus according to any one of claims 1-6, comprises: S100. The material to be mixed is loaded into the material displacement bearing structure, and the material to be mixed is sealed by a piston and an explosion-proof plate. The material to be mixed is a single stone. S200, one of the open displacement components, introduces a gaseous displacement medium into the material displacement support structure; S300, Close one part of the displacement assembly, open the other part of the displacement assembly, and introduce liquid displacement medium into the material displacement support structure until the pressure in the material displacement support structure reaches the preset value. S400, the outlet of the displacing medium on the open material displacing support structure is used to displace the gas displacing medium with liquid displacing medium. Alternately repeat S300 and S400. Only in the last repetition, the pressure of the gas displacement medium reaches 14.1-14.5 MPa, and the pressure of the liquid displacement medium reaches 14.3-14.8 MPa. Before this, the pressure of the gas displacement medium and the liquid displacement medium is lower than the pressure of the last repetition. The pressure of the gas displacement medium and the liquid displacement medium gradually increases in the continuous process. The S500 features a rupture-proof diaphragm and a propulsion structure that provides the driving force to propel the piston, causing the materials to be mixed during the movement to obtain continuously well-graded concrete aggregates. The obtained concrete aggregates are then sorted in a collection bin and remixed to complete the collection of the mixed materials.

8. The method for preparing continuous graded aggregate for concrete based on gas-liquid displacement according to claim 7, characterized in that, The collection bin is formed into multiple material collection sections separated by a screening plate, and the discharge port of each material collection section can be opened or closed. Before step S500, the process further includes opening or closing the discharge ports of the multiple collection sections in the collection bin according to preset conditions, and the remixed mixture is selected from the collection section with the discharge port in the open position.

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