Soil biomass charcoal separating sieve and using method thereof

Abstract

The invention discloses a soil biomass charcoal separating sieve and a using method thereof, a sieve frame of the separating sieve is vertically through, a sieve bottom plate is mounted at the bottom of the sieve frame, and a water baffle is attached to the sieve frame and the sieve bottom plate at a certain angle and is symmetrical to a middle diversion water outlet. The middle flow guide water outlet and the side flow guide water outlets are located in the screen frame, a plurality of blocking dams are arranged between the middle flow guide water outlet and the side flow guide water outlets, one ends of the blocking dams are fixed to the inner side wall of the screen frame, blocking grooves are formed between the adjacent blocking dams, and the groove bottoms of the blocking grooves are located on the edge of the screen bottom plate. When the water flow mixed with the biomass charcoal and the soil passes through the blocking dam, the soil is easier to precipitate in the blocking groove compared with the biomass charcoal. Compared with an existing screen, the blocking dam is designed, kinetic energy of soil moving along with water flow in the screen can be effectively reduced, biomass charcoal can cross the blocking dam to reach the side flow guide water outlet due to the fact that the density of the biomass charcoal is relatively low compared with that of the soil, and therefore separation of the biomass charcoal and the soil is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of biomass sieves, and in particular relates to a soil biomass charcoal separation sieve and a use method thereof. Background Art

[0002] Biochar is widely used in soil improvement, pollutant degradation, soil carbon sequestration and emission reduction due to its rich surface functional groups, developed pore structure and huge specific surface area. As it has become a global consensus to further implement greenhouse gas emission reduction measures and strengthen the carbon sequestration and sink capacity of terrestrial ecosystems, it is urgent to study the response of different soil carbon pools to climate warming, clarify the relative contribution of plant and microbial substrates to soil organic carbon, and reveal the biological and non-biological regulatory mechanisms of different carbon pools in response to climate warming. However, since biochar is mostly applied to the soil in the form of small particles or powder, the biochar and soil are mixed together after being affected by the outdoor environment. In order to reduce the impact of undecomposed biochar contained in the test soil on the experimental results, researchers currently often use methods such as manual separation, high-speed centrifugal separation, electrostatic magnetic separation, saturated cesium chloride solution separation and saturated sodium iodide solution separation to remove biochar from the sample to reduce experimental errors.

[0003] Among them, manual separation mainly involves using tweezers to pick out large biochar particles visible to the naked eye in the test soil. It seems powerless to remove small biochar particles in powder form, and the whole process is time-consuming and laborious. High-speed centrifugal separation mainly uses a certain centrifugal rate to separate biochar of different masses from soil. However, the removal effect of biochar prepared from different materials at a certain centrifugal rate is different, and large biochar particles are easily entangled with the soil in the suspension and eventually deposited at the bottom of the centrifuge tube. In the later stage, manual picking is still required to achieve a slight effect. Electrostatic magnetic separation mainly uses the principle of friction electrification to adsorb or repel the lighter biochar powder in the soil through charged objects to achieve the effect of removing biochar, but this is not ideal for soil rich in metal minerals. The use of the electrostatic principle will cause soil samples carrying metal properties to be excluded together, causing experimental errors. The separation of saturated cesium chloride solution and sodium iodide solution mainly uses the density method to separate different components in the soil. However, both are irritants. Cesium chloride is toxic and sodium iodide solution is weakly alkaline, which has a certain impact on acidic soil experiments. In addition, the reagents are expensive. In order to ensure the accuracy of the experiment, it is necessary to constantly replace and prepare fresh solutions, which will lead to an increase in scientific research costs.

[0004] This application designs a new type of screen, which separates biochar in the soil by utilizing the special structure of the screen. It can effectively screen out large and small particles and powdered biochar without losing the original soil components, and can also reduce the use of chemical reagents, avoid waste liquid pollution, reduce experimental costs, and realize green and harmless experiments. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a soil biomass charcoal separation screen and a method for using the same in view of the deficiencies of the above-mentioned prior art.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0007] A soil-biomass charcoal separation screen comprises a screen frame, which is connected from top to bottom, a screen bottom plate is installed at the bottom of the screen frame, a middle diversion water outlet and a side diversion water outlet are opened on the screen frame, a plurality of blocking dams are arranged between the middle diversion water outlet and the side diversion water outlet, one end of the blocking dam is fixed on the inner wall of the screen frame, blocking grooves are formed between adjacent blocking dams, the bottom of the blocking grooves is located at the edge of the screen bottom plate, when water mixed with biomass charcoal and soil passes through the blocking dam, the soil is more easily precipitated in the blocking groove than the biomass charcoal.

[0008] To optimize the above technical solutions, the specific measures taken also include:

[0009] The screen frame is a circular frame, and screen holes are distributed on the screen bottom plate, wherein the screen bottom plate at the bottom position of the blocking slot is solid and has no screen holes.

[0010] The middle diversion water outlet and the side diversion water outlet are both arranged in the upper half of the inner side of the screen frame, and both open at the top of the screen frame. The longitudinal section of the middle diversion water outlet and the side diversion water outlet is a trapezoidal structure with a wide bottom and a narrow top.

[0011] The number of the central diversion outlet is one, the number of the side diversion outlets is two, the two side diversion outlets are respectively arranged on both sides of the central diversion outlet, and barrier dams are arranged between the central diversion outlet and the two side diversion outlets.

[0012] A water baffle is arranged opposite to the middle diversion outlet of the screen frame. The water baffle is arranged obliquely. The high end of the water baffle is an arc shape with the same curvature as the inner side surface of the screen frame. The high end of the water baffle is fixed to the inner side surface of the screen frame, and the low end of the water baffle is fixed to the upper surface of the screen bottom plate. When water flows from the high end to the low end of the water baffle, the water flow direction is toward the middle diversion outlet.

[0013] The retaining dam is a trapezoidal dam, the end of the retaining dam connected to the screen frame is a trapezoidal bottom, and the end of the retaining dam away from the screen frame is a trapezoidal top.

[0014] The screen frame is a PVC frame or a stainless steel frame, and the screen bottom plate is a nylon mesh surface.

[0015] A method for using a soil biomass charcoal separation sieve, using the soil biomass charcoal separation sieve, specifically comprises the following steps:

[0016] Step 1: Mix the biochar-soil mixture with deionized water, fully oscillate on a vortex oscillator, and then separate by ultrasound to obtain powdered or small-particle lightweight biochar on the surface of the liquid, and collect the biochar on the surface of the liquid;

[0017] Step 2: Pour the water-soil mixture after removing the biochar from the liquid surface into the soil-biochar separation sieve. After the water seeps through the sieve holes, the solids are deposited on the sieve bottom plate. The solids deposited on the sieve bottom plate are washed by spraying with a washing bottle to fully disperse the biochar and soil mixed particles, and pick out the large biochar particles on the sieve bottom plate.

[0018] Step 3: Use a watering can to spray water on the water baffle so that the water flow fully covers the surface of the sieve bottom plate, and the horizontally flowing water flow deposits the remaining biomass charcoal and soil on the surface of the sieve bottom plate below the middle diversion outlet;

[0019] Step 4, rotate the soil biomass charcoal separation screen forward and backward to tilt the soil biomass charcoal separation screen, and the tilt direction is: the side of the screen bottom plate close to the middle diversion outlet is lower than the side close to the water retaining plate, and then repeatedly rotate the soil biomass charcoal separation screen clockwise and counterclockwise to make the water flow drive the deposits to move back and forth between the blocking dams, wherein the soil with higher density is blocked by the blocking dam and falls into the blocking trough, and the biomass charcoal with lower density is driven by the water flow to cross the blocking dam and move to the bottom of the side diversion outlet, and stop the watering can from spraying water on the water retaining plate to make the water seep down from the screen holes;

[0020] Step 5: further rotate the soil-biomass charcoal separation screen forward and backward to make the soil-biomass charcoal separation screen more inclined, use a watering can to flush the biomass charcoal below the side diversion outlet into the side diversion outlet, collect and package the biomass charcoal at the side diversion outlet, restore the soil-biomass charcoal separation screen to a horizontal level, and shake the soil-biomass charcoal separation screen to move the biomass charcoal and soil to the middle of the sieve bottom plate;

[0021] Step 6, repeat steps 3-5 several times, the solids retained on the sieve bottom plate are low-mix soil, use a watering can to spray water on the water retaining plate, so that the water flow fully covers the surface of the sieve bottom plate, and the horizontally flowing water accumulates the low-mix soil on the surface of the sieve bottom plate below the middle diversion outlet, stop spraying water on the water retaining plate with the watering can, and let the water seep down from the sieve holes;

[0022] Step 7: Rotate the soil-biomass charcoal separation screen forward and backward, use a watering can to flush the low-impurity soil below the middle diversion outlet into the middle diversion outlet, and collect and package the low-impurity soil at the middle diversion outlet.

[0023] In step 1, the biochar-soil mixed sample is mixed with deionized water in a ratio of 1:10 by weight, and fully shaken on a vortex shaker for 2-4 minutes, and then separated by ultrasound for 3-6 minutes to obtain powdered or small-particle lightweight biochar on the surface of the liquid, and the biochar on the surface of the liquid is collected.

[0024] In step 1, a 100-mesh colander is used to scoop up the liquid surface, and the separated biochar is transferred to a small beaker and dried in an oven to obtain powdered or small-particle lightweight biochar.

[0025] The beneficial effects of the present invention are:

[0026] 1. Compared with the existing screen, the present invention designs a barrier dam, which can effectively slow down the kinetic energy of soil migrating with water in the screen. Since the density of biochar is relatively lighter than that of soil, it will cross the barrier dam and reach the side diversion outlet, thereby separating the biochar from the soil (this design is very effective for experiments on aggregate classification and screening of biochar).

[0027] 2. The present invention designs a water retaining plate. When doing soil classification or organic matter related experiments, in order to ensure the accuracy of the experiment, a large amount of deionized water is required for cleaning. Now, through a water retaining plate with a certain angle, the water surface tension and the kinetic energy of the water flow are used, and the water will not flow directly through the mesh surface of the sieve bottom plate, but move along the sieve bottom plate to the middle diversion outlet. In this way, very little water can be used to efficiently drive the materials on the sieve bottom plate to gather at the lower part of the middle diversion outlet (this design is very beneficial for the study of granular / mineral-bound materials in the soil).

[0028] 3. The present invention designs a middle diversion outlet and a side diversion outlet with a wide bottom and a narrow top in the longitudinal section, which facilitates the gathering of biochar and soil at the diversion outlet, and can effectively solve the problem of difficulty in collecting biochar and soil during the experiment. The biochar screen in the prior art does not have such a diversion outlet. After screening the biochar and soil, they need to be loaded into a small-diameter sealed bag. In order to avoid sample loss, folded kraft paper or weighing paper is used to assist in bagging. This is not only troublesome, but also requires constant paper replacement to avoid sample cross-over. The diversion outlet with a wide bottom and a narrow top in the longitudinal section designed by the present invention can guide the material to gather at the outlet, and then achieve precise bagging through the gap, which not only avoids cross-contamination of samples, but also reduces the loss of paper materials.

[0029] 4. The present invention is designed with three water outlets, including two side diversion outlets. The user can select the side diversion outlet on one side and the barrier dam on the corresponding side for operation according to different hand habits. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a front view of the present invention;

[0031] Figure 2 is a side view of the present invention;

[0032] Figure 3 It is a rear view of the present invention;

[0033] Figure 4 is a cross-sectional view of the present invention;

[0034] Figure 5 It is a stereogram of the present invention.

[0035] The reference numerals in the drawings are: screen frame 1 , screen bottom plate 2 , screen hole 21 , middle diversion water outlet 3 , side diversion water outlet 4 , barrier dam 5 , water retaining plate 6 . DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated by examples below. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0037] The present invention mainly consists of five important structures, namely: a PVC cylindrical screen frame 1 (mainly serving as a support for the screen bottom plate 2), a screen bottom plate 2 (mainly for screening out soil and biochar of different particle sizes), a central diversion outlet 3, a side diversion outlet 4 (mainly for facilitating the pouring of wastewater and bagging of materials, reducing the risk of sample scattering during bagging), a trapezoidal barrier dam 5 (mainly used to prevent soil from migrating with water flow), and a semicircular water retaining plate 6 (mainly utilizing an inclined angle and a design close to the mesh surface so that water can flow along the mesh surface to the outlet to achieve the function of cleaning the mesh surface).

[0038] Working principle: First, use a vortex oscillator to disperse the soil in deionized water, and then use ultrasound to disperse the large soil particles that have not been separated by vibration, so that the biochar inside is completely released. Then, the permeability of the sieve holes 21 of the sieve bottom plate 2 is utilized, and by selecting sieve bottom plates 2 with different mesh sizes, the separation of biochar and soil of different particle sizes is achieved. Secondly, the tension characteristics of water are utilized. By controlling the angle of the water flow through the sieve bottom plate 2, the effect of flushing the sieve bottom plate 2 is achieved, and then the kinetic energy of the water and the barrier dam structure are used to separate the lighter biochar from the soil. Finally, the side diversion outlet 4 is used to achieve water and soil separation and portable material collection.

[0039] Specifically, the method of using the soil biomass charcoal separation screen of the present invention is as follows:

[0040] Step 1, mixing the biochar-soil mixed sample with deionized water in a weight ratio of 1:10, vortexing on a vortex shaker for 2-4 minutes, and then ultrasonically separating for 3-6 minutes, using a 100-mesh colander to scoop and collect the liquid surface to obtain powdered or small-particle lightweight biochar;

[0041] Step 2, pour the water-soil mixture after removing the biochar from the liquid surface into the soil-biochar separation sieve, after the water seeps down from the sieve holes 21, the solids are deposited on the sieve bottom plate 2, and the solids deposited on the sieve bottom plate 2 are washed by spraying with a washing bottle to fully disperse the biochar and soil mixed particles, and pick out the large biochar particles on the sieve bottom plate 2;

[0042] Step 3, use a watering can to spray water on the water retaining plate 6, so that the water flow fully covers the surface of the sieve bottom plate 2, and the horizontally flowing water flow deposits the remaining biomass charcoal and soil on the surface of the sieve bottom plate 2 at the position below the middle diversion outlet 3;

[0043] Step 4, rotate the soil biomass charcoal separation screen forward and backward to tilt the soil biomass charcoal separation screen, and the tilt direction is: the side of the screen bottom plate 2 close to the middle diversion outlet 3 is lower than the side close to the water retaining plate 6, and then repeatedly rotate the soil biomass charcoal separation screen clockwise and counterclockwise to make the water flow drive the deposit to move back and forth between the blocking dams 5, wherein the soil with higher density is blocked by the blocking dam 5 and falls into the blocking trough, and the biomass charcoal with lower density is driven by the water flow to cross the blocking dam and move to the bottom of the side diversion outlet 4, and stop the watering can from spraying water on the water retaining plate 6 to make the water seep down from the screen hole 21;

[0044] Step 5, further rotate the soil biomass charcoal separation screen forward and backward to make the soil biomass charcoal separation screen more inclined, use a watering can to flush the biomass charcoal below the side diversion outlet 4 into the side diversion outlet 4, collect and package the biomass charcoal at the side diversion outlet 4, restore the soil biomass charcoal separation screen to a horizontal level, shake the soil biomass charcoal separation screen, and move the biomass charcoal and soil to the middle of the sieve bottom plate 2;

[0045] Step 6, repeat steps 3-5 several times, the solids remaining on the sieve bottom plate 2 are low-mix soil, use a watering can to spray water on the water retaining plate 6, so that the water flow fully covers the surface of the sieve bottom plate 2, and the lateral flow of water accumulates the low-mix soil on the surface of the sieve bottom plate 2 below the middle diversion outlet 3, stop spraying water on the water retaining plate 6 with the watering can, and let the water seep down from the sieve hole 21;

[0046] Step 7: Rotate the soil-biomass-charcoal separation screen forward and backward, use a watering can to flush the low-impurity soil below the middle diversion outlet 3 into the middle diversion outlet 3, and collect and package the low-impurity soil at the middle diversion outlet 3.

[0047] The biochar used in the following actual case comes from a Zhejiang Environmental Protection Technology Co., Ltd. The raw materials for preparation are: corn straw, rice straw and pig manure, and the preparation temperature is 500°C.

[0048] Practical Case 1

[0049] The implementation plan of biochar is based on 1% and 2% of soil mass percentage, and the main types of biochar applied are corn straw charcoal, rice straw charcoal and pig manure straw charcoal. It is applied to dryland red and yellow soil. The implementation operation is to start from the soil surface by manual spreading two weeks before tillage, and then use a rotary tiller to fully mix it with the 10-15cm surface soil. Cabbage and sweet potato rotation is carried out, and the planting pattern and fertilization method are consistent with local farmland management.

[0050] Practical Case 2

[0051] The implementation plan for biochar is 1% and 2% of the soil mass percentage, and the main types of biochar used are: corn straw charcoal, rice straw charcoal and pig manure straw charcoal. It is applied to paddy clay. The implementation operation is to start with the soil surface by manual spreading two weeks before tillage, and then use a rotary tiller to fully mix it with the 15-20cm surface soil. Wheat and rice rotation is carried out, and the planting pattern and fertilization method are consistent with local farmland management.

[0052] Around October of each year, after the crops are harvested, soil samples are collected from the above two plots. The five-point sampling method is used to uniformly sample the soil in each plot, with the sampling depth of dryland soil being 0-15cm and the paddy field soil being 0-20cm. The samples are packaged and stored at low temperatures and then sent back to the laboratory in a timely manner.

[0053] The specific operation process is as follows:

[0054] (1) Soil samples retrieved from the experimental area were pre-treated (removing stones, weeds, plant roots, and small animals in the soil) and then naturally dried in the shade.

[0055] (2) Take the dried soil in (1) as the experimental operating soil, weigh the soil required for the experiment and mix it with deionized water in a ratio of 1:10, fully shake it on a vortex shaker for 2 minutes (the shaking time for paddy field soil is 4 minutes), and then separate it by ultrasound for 3 minutes (the ultrasound time for paddy field soil is 6 minutes). Use a 100-mesh small colander to obtain powdered or small-particle lightweight biochar on the surface of the liquid.

[0056] (3) The present invention is placed in a water basin of a certain size, and then the water-soil mixture treated in (2) is poured into a separation screen, and the solids deposited on the screen bottom plate 2 are sprayed with a washing bottle to fully disperse the biomass charcoal and soil mixed particles. At this time, large biomass charcoal particles visible to the naked eye can be obtained, which can be picked out with tweezers.

[0057] (4) Use a watering can to spray water on the water retaining plate 6 so that the water flow fully covers the screen bottom plate 2, and the biomass charcoal and soil remaining on the screen after (3) treatment are slowly accumulated at the bottom of the middle diversion outlet 3.

[0058] (5) Use a watering can to slowly rinse the soil deposits treated in (4), and rotate the separation screen so that the water flow drives the deposits to move back and forth between the barrier dams 5. At this time, it can be seen that the soil with higher density will be blocked in the barrier dam 5, and the biochar with lower density will be driven by the water flow to pass through the barrier dam 5 to the lower part of the diversion outlet No. 1 or 2 (depending on which hand the operator is accustomed to using to determine the outflow position of the material).

[0059] (6) Use a watering can to slowly wash the biochar deposited at the bottom of the side diversion outlet 4 after treatment in (5) into a beaker for collection. After multiple rotations and washings, a complete soil with less impurities can be obtained, which is also slowly washed to the middle diversion outlet 3 using a watering can, and collected and packaged through the outlet.

[0060] Note: According to different experimental requirements, select sieves with different apertures / mesh sizes. According to actual conditions, the material (nylon or metal) and thickness (thickness of sieve frame 1 and sieve bottom plate 2) of the separation sieve can be appropriately changed to improve the ability to screen out biomass charcoal and improve experimental efficiency.

[0061] Details on the screening effects of biochar on different soil types in different treatments are shown in Tables 1 and 2 .

[0062] Table 1 Comparison of screening effects of different biochars in dryland red and yellow soil

[0063]

[0064] Table 2 Comparison of screening effects of different biochars in paddy clay

[0065]

[0066] It can be understood that the above specific description of the present invention is only used to illustrate the present invention and is not limited to the technical solution described in the implementation of the calculation method of the present invention. Ordinary technicians in the field should understand that the present invention can still be modified or replaced by equivalents to achieve the same technical effect; as long as the requirements of the calculation method are met, they are all within the protection scope of the present invention.

Claims

1. A soil biomass charcoal separation screen, comprising a screen frame (1), wherein the screen frame (1) is connected from top to bottom, and a screen bottom plate (2) is installed at the bottom of the screen frame (1), wherein: The screen frame (1) is provided with a central diversion outlet (3) and a side diversion outlet (4), and a plurality of blocking dams (5) are arranged between the central diversion outlet (3) and the side diversion outlet (4). One end of the blocking dam (5) is fixed on the inner wall of the screen frame (1), and blocking grooves are formed between adjacent blocking dams (5). The bottom of the blocking groove is located at the edge of the screen bottom plate (2). When water mixed with biochar and soil passes through the blocking dam (5), the soil is more likely to settle in the blocking groove than the biochar.

2. A soil biomass charcoal separation sieve according to claim 1, characterized in that: The sieve frame (1) is a circular frame, and sieve holes (21) are distributed on the sieve bottom plate (2), wherein the sieve bottom plate at the bottom of the blocking trough is solid and has no sieve holes (21).

3. A soil biomass charcoal separation sieve according to claim 2, characterized in that: The central diversion water outlet (3) and the side diversion water outlet (4) are both arranged in the upper half of the inner side of the screen frame (1); the central diversion water outlet (3) and the side diversion water outlet (4) are both opened at the top of the screen frame (1); the longitudinal section of the central diversion water outlet (3) and the side diversion water outlet (4) is a trapezoidal structure with a wide bottom and a narrow top.

4. The soil biomass charcoal separation screen according to claim 1, characterized in that: The number of the central diversion water outlet (3) is one, the number of the side diversion water outlets (4) is two, the two side diversion water outlets (4) are respectively arranged on both sides of the central diversion water outlet (3), and a barrier dam (5) is arranged between the central diversion water outlet (3) and the two side diversion water outlets (4).

5. The soil biomass charcoal separation screen according to claim 3 is characterized by: The screen frame (1) is provided with a water baffle (6) opposite to the middle diversion outlet (3). The water baffle (6) is arranged obliquely. The high end of the water baffle (6) is in an arc shape with the same curvature as the inner side surface of the screen frame (1). The high end of the water baffle (6) is fixed to the inner side surface of the screen frame (1), and the low end of the water baffle (6) is fixed to the upper surface of the screen bottom plate (2). When water flows from the high end of the water baffle (6) to the low end, the water flows in the direction toward the middle diversion outlet (3).

6. A soil biomass charcoal separation sieve according to claim 5, characterized in that: The barrier dam (5) is a trapezoidal dam, the end of the barrier dam (5) connected to the screen frame (1) is a trapezoidal bottom, and the end of the barrier dam (5) away from the screen frame (1) is a trapezoidal top.

7. The soil biomass charcoal separation screen according to claim 1, characterized in that: The sieve frame (1) is a PVC frame or a stainless steel frame, and the sieve bottom plate (2) is a nylon mesh surface.

8. A method for using a soil biomass charcoal separation screen, characterized in that: Using the soil biomass charcoal separation screen as claimed in claim 5 specifically comprises the following steps: Step 1: Mix the biochar-soil mixture with deionized water, fully oscillate on a vortex oscillator, and then separate by ultrasound to obtain powdered or small-particle light biochar on the surface of the liquid, and collect the biochar on the surface of the liquid; Step 2, pouring the water-soil mixture after removing the light biochar on the liquid surface into the soil-biochar separation sieve, after the water seeps down from the sieve holes (21), the solid is deposited on the sieve bottom plate (2), and the solid deposited on the sieve bottom plate (2) is sprayed with a washing bottle to fully disperse the biochar and soil mixed particles, and the large biochar particles on the sieve bottom plate (2) are picked out; Step 3, using a watering can to spray water on the water retaining plate (6), so that the water flow fully covers the surface of the sieve bottom plate (2), and the lateral flow of water deposits the remaining biomass charcoal and soil on the surface of the sieve bottom plate (2) at a position below the middle diversion outlet (3); Step 4, rotating the soil biomass charcoal separation screen forward and backward to tilt the soil biomass charcoal separation screen, and the tilting direction is: the side of the screen bottom plate (2) close to the middle diversion outlet (3) is lower than the side close to the water retaining plate (6), and then repeatedly rotating the soil biomass charcoal separation screen clockwise and counterclockwise to make the water flow drive the deposit to move back and forth between the blocking dams (5), wherein the soil with a larger density is blocked by the blocking dam (5) and falls into the blocking trough, and the biomass charcoal with a smaller density is driven by the water flow to cross the blocking dam and move to the bottom of the side diversion outlet (4), and the watering can is stopped from spraying water on the water retaining plate (6), so that the water seeps down from the screen holes (21); Step 5, further rotating the soil-biomass charcoal separation screen forward and backward to make the soil-biomass charcoal separation screen more inclined, using a watering can to flush the biomass charcoal below the side diversion water outlet (4) into the side diversion water outlet (4), collecting and packaging the biomass charcoal at the side diversion water outlet (4), restoring the soil-biomass charcoal separation screen to a horizontal position, and shaking the soil-biomass charcoal separation screen to move the biomass charcoal and soil to the middle of the sieve bottom plate (2); Step 6, repeating steps 3-5 several times, the solids remaining on the sieve bottom plate (2) are low-mix soil, using a watering can to spray water on the water retaining plate (6), so that the water flow fully covers the surface of the sieve bottom plate (2), and the lateral flow of water deposits the low-mix soil on the surface of the sieve bottom plate (2) below the middle diversion outlet (3), and stopping the watering can from spraying water on the water retaining plate (6) to allow water to seep down from the sieve hole (21); Step 7: Rotate the soil-biomass-charcoal separation screen forward and backward, use a watering can to flush the low-impurity soil below the middle diversion outlet (3) into the middle diversion outlet (3), and collect and package the low-impurity soil at the middle diversion outlet (3).

9. The method for using the soil biomass charcoal separation screen according to claim 8, characterized in that: In step 1, the biochar-soil mixed sample is mixed with deionized water in a weight ratio of 1:10, and fully shaken on a vortex shaker for 2-4 minutes, and then separated by ultrasound for 3-6 minutes to obtain powdered or small-particle light biochar on the surface of the liquid, and the biochar on the surface of the liquid is collected.

10. The method for using the soil biomass charcoal separation screen according to claim 8, characterized in that: In step 1, a 100-mesh colander is used to scoop up the liquid surface, and the separated biochar is transferred to a small beaker and dried in an oven to obtain powdered or small-particle lightweight biochar.

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