Mineral multi-stage separation and quality improvement system

Abstract

The invention relates to a mineral multi-stage separation and upgrading system, which belongs to the technical field of mineral separation and upgrading, and comprises a first separation bed body and a separation assembly arranged on the first separation bed body, the separation assembly comprises a plurality of air chambers which are continuously arranged on the lower side of the first separation bed body along the length direction of the first separation bed body; the multiple air distribution holes are vertically formed in the bed surface of the first separation bed body at equal intervals, and the multiple air valves are vertically and fixedly arranged at the bottom of the air chamber in a one-to-one correspondence mode. Through cooperative use of the air chamber and the air distribution holes in the first separation bed body, airflow is blown out from the air distribution holes, so that oil shale particles on the bed surface are in a fluidized state and move in the length direction of the bed surface, and the oil shale particles are separated from the air distribution holes; pulse airflow is output by the air valve and is blown out through the air distribution holes, so that the movement activity of the stacked and interlaced oil shale particles on the bed surface is enhanced, the oil shale is loose, fluidized and uniformly distributed, the separation of concentrate and gangue is realized, the separation effect of the oil shale particles is ensured, the grade of the oil shale is improved, and the energy consumption of a subsequent pyrolysis oil extraction process of the oil shale is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of mineral sorting and upgrading, and in particular relates to a multi-stage mineral sorting and upgrading system. Background Art

[0002] Oil shale, as a combustible organic sedimentary rock that depends on shale oil, has an oil content of more than 3.5%. It is an important alternative resource for oil and gas, and has great value in resource utilization. Low-grade oil shale ore contains a large amount of gangue, and the oil enrichment rate of direct pyrolysis of oil shale is low. Usually, in order to increase the oil enrichment rate, the energy consumed by pyrolysis of oil shale is high. Therefore, sorting, enriching and upgrading oil shale can improve the grade of oil shale, ensure the oil enrichment rate, and reduce the energy consumption of subsequent pyrolysis and oil extraction process of oil shale.

[0003] Since oil shale is mostly flaky, high-density, fine-grained sedimentary rock, its density is greater than 2.0 g / cm 3 However, the oil-containing solid components are mostly distributed in the area with a density less than or equal to 1.9 g / cm 3 In the fine-grained organic minerals of oil shale. When sorting, enriching and upgrading oil shale, wet heavy medium sorting equipment and gas-solid fluidized bed are often used for processing. Among them, the wet heavy medium sorting equipment forms a high-density suspension fluidized environment by mixing high-density medium with water. The density of the suspension is greater than 2.0 g / cm 3 , the mined oil shale is introduced into the suspended fluidized liquid, and the suspension is used to drive the oil shale to move, thereby achieving the separation of gangue and oil-containing solids. However, the viscosity of the formed suspension is relatively high, and the high-density medium particles constantly collide and rub during the movement. Long-term sorting will cause serious wear of the high-density medium particles, resulting in the bed density being unable to meet the stable high-density environment for oil shale sorting, resulting in the subsequent oil-containing solids in the oil shale not being sorted out, reducing the effect of oil shale sorting, enrichment and quality improvement.

[0004] The gas-solid fluidized bed uses airflow to fluidize oil shale. The solid particles in the fluidized bed will form a dynamic bed. The solid particles with high density are more difficult to be driven by the airflow and will gradually settle to the bottom of the bed, while the solid particles with low density will rise with the airflow, thereby achieving the separation of gangue and oil-containing solids. However, the fine-grained, high-density, and flaky characteristics of oil shale particles easily lead to random stacking and interweaving of particles during the gas-solid fluidization sorting process, resulting in high tortuosity of the gaps in the formed particle bed, poor gas stagnation performance, and low expansion rate, resulting in a short free flow time of flaky particles and a small sorting space, which seriously restricts the sedimentation behavior of fine-grained flaky oil shale particles in the gas-solid fluidized bed and reduces the effect of oil shale sorting, enrichment, and quality improvement.

[0005] In summary, the existing wet heavy medium separation equipment and gas-solid fluidized bed cannot guarantee the effect of sorting, enriching and upgrading oil shale, which makes the energy consumption of subsequent pyrolysis and oil extraction process of oil shale still high. Summary of the invention

[0006] In view of this, the present invention provides a mineral multi-stage sorting and quality improvement system to solve the deficiencies in the prior art. The present invention can enhance the movement activity of stacked and interwoven oil shale particles, achieve loose fluidization and uniform distribution of oil shale, and ensure the sorting effect of oil shale particles.

[0007] The technical solution of the present invention is: a multi-stage mineral sorting and quality improvement system, including a first sorting bed and a sorting component arranged on the first sorting bed to pre-sort the oil shale particles introduced onto the bed surface of the first sorting bed, the sorting component including a plurality of air chambers continuously arranged on the lower side of the first sorting bed along the length direction thereof, the bottom of the air chamber being connected to an external air source through a pipeline, a plurality of air distribution holes being vertically opened at equal intervals on the bed surface of the first sorting bed, the air distribution holes being connected to the air chambers directly below them respectively, the gas in the air chamber being blown out from the air distribution holes so that the oil shale particles on the bed surface are fluidized and move along the length direction of the bed surface, a plurality of air valves being vertically fixed one by one at the bottom of the air chamber, one end of the air valve being connected to the corresponding air chamber, and the other end being connected to an external air source through a pipeline, the air valve outputting a pulsed airflow being blown out through the air distribution holes so that the stacked and intertwined oil shale particles on the bed surface are loosely fluidized.

[0008] Preferably, the frequency of the pulse airflow on the first sorting bed gradually decreases from the feeding end to the discharging end of the bed surface, and the frequency range of the pulse airflow on the first sorting bed is 15 Hz-25 Hz.

[0009] Preferably, a plurality of first vibrators are arranged at equal intervals along the length direction of one side of the bed surface of the first sorting bed, and the vibration frequency range of the first vibrators is 30 Hz-50 Hz, and the amplitude range is 1 mm-3 mm.

[0010] Preferably, a second sorting bed is arranged on one side of the discharge end of the first sorting bed, and the bed surface of the second sorting bed is connected with the bed surface of the first sorting bed, so that the oil shale particles in a fluidized state on the bed surface of the first sorting bed can flow into the bed surface of the second sorting bed, and the second sorting bed is provided with a sorting component, and the arrangement method of the sorting component on the first sorting bed is the same, so as to finely sort the oil shale particles flowing into the bed surface of the second sorting bed.

[0011] Preferably, the frequency range of the pulse airflow output from the second sorting bed is 0-15 Hz.

[0012] Preferably, a plurality of second vibrators are arranged at equal intervals along the length direction on one side of the bed surface of the second sorting bed, and the vibration frequency range of the second vibrator is 0-30 Hz, and the amplitude range is 1 mm-3 mm.

[0013] Preferably, a material guide plate is arranged between the bed surface of the second sorting bed and the first sorting bed, one end of the material guide plate is connected to the bed surface of the first sorting bed, and the other end is connected to the bed surface of the second sorting bed, and the material guide plate is arranged obliquely downward from one end close to the first sorting bed to the other end.

[0014] Preferably, it also includes: a plurality of online near-infrared spectrometers, which are arranged at equal intervals on one side of the bed surface of the second sorting bed along the length direction of the second sorting bed to collect the mixing entropy of the oil shale particle bed on the second sorting bed.

[0015] Preferably, it also includes: multiple groups of optical fiber sensors and pressure sensors, which are arranged at equal intervals along the length direction of the second sorting bed on one side of its bed surface, and each group of multiple optical fiber sensors and pressure sensors are arranged at equal intervals vertically, and the number of each group of optical fiber sensors and pressure sensors gradually decreases from the feed end to the discharge end of the second sorting bed, so as to collect the bed porosity and bed density of the oil shale particle bed on the second sorting bed.

[0016] Preferably, the concentrate discharge end and the gangue discharge end of the second sorting bed are respectively provided with a radiation source and a high-pressure nozzle, and the radiation source is arranged directly opposite to the outlets of the concentrate discharge end and the gangue discharge end, respectively, so as to irradiate the concentrate and gangue outputted from the concentrate discharge end and the gangue discharge end, and the high-pressure nozzle is respectively fixed obliquely upward directly below the concentrate discharge end and the gangue discharge end.

[0017] Compared with the prior art, the present invention provides a multi-stage mineral sorting and quality improvement system, which cooperates with the air chamber and air distribution holes on the first sorting bed to allow air to be blown out from the air distribution holes, so that the oil shale particles on the bed surface are fluidized and move along the length direction of the bed surface, and then the air valve is used to output pulse air flow to be blown out through the air distribution holes, so that the movement activity of the stacked and interwoven oil shale particles on the bed surface is enhanced, and the stacked and interwoven fine-grained foliated oil shale particle groups are accelerated to be broken, so that the oil shale is loosely fluidized and evenly distributed, the separation of concentrate and gangue is achieved, and the sorting effect of the oil shale particles is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the sorting and upgrading system of the present invention; Figure 2 It is a schematic diagram of the state of oil shale particles in the separation and upgrading system of the present invention; Figure 3It is a schematic diagram of the arrangement of sensors of the sorting and upgrading system of the present invention; Figure 4 It is a sorting schematic diagram of the sorting and quality-improving system of the present invention.

[0019] Explanation of the reference numerals: 1. first sorting bed; 2. second sorting bed; 3. high-pressure nozzle; 4. feed hopper; 8. blast bag; 9. wind bag; 10. butterfly valve group; 11. air chamber; 12. air distribution hole; 13. air valve; 14. first vibrator; 15. guide plate; 21. second vibrator; 22. online near-infrared spectrometer; 23. optical fiber sensor; 24. pressure sensor. DETAILED DESCRIPTION

[0020] The present invention provides a multi-stage mineral sorting and upgrading system. Figures 1 to 4 The present invention is described with reference to the structural schematic diagram of FIG.

[0021] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the technical solutions of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] Reference Figure 1 , Figure 1 Schematic diagram of the structure of the sorting and upgrading system of this embodiment. Figure 1 As shown, a mineral multi-stage sorting and upgrading system includes a first sorting bed 1 and a sorting component arranged on the first sorting bed 1 to pre-sort the oil shale particles introduced onto the bed surface of the first sorting bed 1. The sorting component includes a plurality of air chambers 11 continuously arranged on the lower side of the first sorting bed 1 along the length direction thereof, the bottom of the air chamber is connected to an external air source through a pipeline, a plurality of air distribution holes 12 are vertically opened at equal intervals on the bed surface of the first sorting bed 1, the air distribution holes 12 are respectively connected to the air chambers directly below them, and the gas in the air chamber is blown out from the air distribution holes 12 to make the oil shale particles on the bed surface fluidized and move along the length direction of the bed surface, a plurality of air valves 13 are vertically fixed one by one at the bottom of the air chamber, one end of the air valve 13 is connected to the corresponding air chamber, and the other end is connected to the external air source through a pipeline, and the air valve 13 outputs a pulse airflow that is blown out through the air distribution holes 12 to make the oil shale particles stacked and interwoven on the bed surface loosely fluidized.

[0023] The multi-stage mineral sorting and upgrading system proposed in this embodiment introduces oil shale particles onto the bed surface of the first sorting bed body through the feed hopper 4, and uses the air chamber and air distribution holes on the first sorting bed body to make the air flow blow out from the air distribution holes, and uses a constant air flow to make the oil shale particles on the bed surface fluidized and move along the length direction of the bed surface, and then uses the air valve to output pulse air flow to be blown out through the air distribution holes, so that the movement activity of the stacked and interwoven oil shale particles on the bed surface is enhanced, and the stacked and interwoven fine-grained foliated oil shale particle groups are accelerated to be broken, so that the oil shale is loosely fluidized and evenly distributed, and the fluidized oil shale particles are accurately layered and segregated according to density, so as to achieve the separation of concentrate and gangue, and ensure the sorting effect of oil shale particles.

[0024] Due to the high density and flaky characteristics of oil shale, during the feeding stage, the particles are tightly stacked, the thickness of the material layers at different positions of the bed are different, the distribution of strong and weak force chains in thick and thin particle layers is obviously different, and the force chain bonding effect between particles formed in the thick layer is strong.

[0025] Based on this, this embodiment proposes a solution. The frequency of the pulse airflow on the first sorting bed 1 gradually decreases from the inlet end to the outlet end of the bed surface. The frequency range of the pulse airflow on the first sorting bed 1 is 15Hz-25Hz.

[0026] In order to break the interweaving effect between particles and promote loose fluidization of particles, this embodiment adopts large airflow at the inlet of the first sorting bed 1, so that the stacked and interwoven oil shale particles can be quickly loosened and the materials can be migrated, so that the oil shale particles can jump to the sorting bed surface, further improving the effect of uniform distribution of loose fluidization of oil shale.

[0027] As a further optimization solution, a plurality of first vibrators 14 are arranged at equal intervals along the length direction of one side of the bed surface of the first sorting bed 1. The vibration frequency range of the first vibrator 14 is 30 Hz-50 Hz, and the amplitude range is 1 mm-3 mm.

[0028] In order to further break the interweaving effect between particles and promote the loosening and fluidization of particles in this embodiment, a large vibration effect is adopted at the inlet of the first sorting bed 1, so that the stacked and interwoven oil shale particles can be quickly loosened and the materials can be migrated, so that the oil shale particles can jump to the sorting bed surface, and the effect of uniform distribution of loose fluidization of oil shale can be further improved.

[0029] Vibration and air supply (constant airflow + pulse airflow) are arranged on the first sorting bed 1, so that large vibration and large airflow are used at the feeding end to quickly loosen the stacked and interwoven oil shale particles, migrate the materials, and make the oil shale particles jump to the sorting bed surface. Under the synergistic effect of constant airflow, pulse airflow and vibration, the particle movement activity is enhanced, the stacked and interwoven fine-grained foliated oil shale particle group is accelerated to be broken, and the material is evenly distributed, thereby achieving the pre-sorting effect.

[0030] In this embodiment, the flow rate of the constant airflow ranges from 0 to 200 cm / s.

[0031] After the oil shale particles are evenly distributed and pre-sorted, they also need to be precisely sorted to accurately separate the concentrate from the gangue.

[0032] As a further optimization scheme, a second sorting bed 2 is arranged on one side of the discharge end of the first sorting bed 1, and the bed surface of the second sorting bed 2 is connected with the bed surface of the first sorting bed 1, so that the oil shale particles in a fluidized state on the bed surface of the first sorting bed 1 can flow into the bed surface of the second sorting bed 2. The second sorting bed 2 is provided with a sorting component, and the arrangement method of the sorting component is the same as that of the first sorting bed 1, so as to finely sort the oil shale particles flowing into the bed surface of the second sorting bed 2.

[0033] In this embodiment, the constant airflow and pulse airflow output by the sorting component are used to form a uniform and stable suspension sorting environment for the oil shale particle bed. At this time, the selected particles can be accurately sorted according to the bed density.

[0034] Reference Figure 2 , Figure 2 Schematic diagram of the state of oil shale particles in the sorting and upgrading system of this embodiment. Figure 2 As shown, in the first stage, vibration and air supply (constant airflow + pulse airflow) are arranged to achieve large vibration and large airflow at the feeding end, so that the oil shale particles jump to the sorting bed surface. Under the synergistic effect of constant airflow, pulse airflow and vibration, the particle movement activity is enhanced, the stacking and interweaving of fine-grained foliated oil shale particles are accelerated, the material is evenly distributed, and the pre-sorting effect is achieved. After uniform distribution and pre-sorting, the oil shale particles enter the second stage. In the second stage, under the synergistic effect of vibration and airflow, the oil shale particle bed forms a uniform and stable suspended sorting environment. At this time, the selected particles can be accurately sorted according to the bed density.

[0035] As a further optimization solution, the frequency range of the pulse airflow output from the second sorting bed 2 is 0-15 Hz.

[0036] In this embodiment, a relatively high frequency pulsed airflow is used to ensure that the oil shale particle bed forms a uniform and stable suspension sorting environment while promoting uniform fluidization of the oil shale particles, wherein the flow rate of the constant airflow ranges from 0 to 100 cm / s.

[0037] Preferably, a plurality of second vibrators 21 are arranged at equal intervals along the length direction on one side of the bed surface of the second sorting bed 2, and the vibration frequency range of the second vibrators 21 is 0-30 Hz, and the amplitude range is 1 mm-3 mm.

[0038] Under the synergistic effect of vibration and airflow, the particle bed forms a uniform and stable suspended sorting environment, and the oil shale particles can be accurately sorted according to the bed density.

[0039] During the sorting process, the uniformity and stability of the bed density is the key to affecting the accurate sorting of particles by density. Therefore, when the oil shale particles move from the bed surface of the first sorting bed to the bed surface of the second sorting bed, the bed density needs to be kept uniform and stable.

[0040] Based on this, this embodiment proposes a solution, a material guide plate 15 is arranged between the second sorting bed 2 and the bed surface of the first sorting bed 1, one end of the material guide plate 15 is connected to the bed surface of the first sorting bed 1, and the other end is connected to the bed surface of the second sorting bed 2, and the material guide plate 15 is arranged to be inclined downward from one end close to the first sorting bed 1 to the other end.

[0041] In this embodiment, in order to reduce the disturbance of bed density, the feed particles slide from the bed surface of the first sorting bed 1 to the bed surface of the second sorting bed 2 through the guide plate 15, thereby weakening the disturbance caused by the particles falling directly and vertically into the second sorting bed 2, ensuring the uniformity and stability of the bed density, and further improving the sorting effect of oil shale particles.

[0042] Fluctuations in bed density affect the quality of particle sorting products. To achieve real-time online adjustment of bed density, it is necessary to obtain product grade in a timely manner and adjust bed density based on product quality feedback.

[0043] To achieve this goal, this embodiment proposes a further solution, which also includes: multiple online near-infrared spectrometers 22, and the multiple online near-infrared spectrometers 22 are arranged at equal intervals along the length direction of the second sorting bed 2 on one side of its bed surface to collect the mixing entropy of the oil shale particle bed on the second sorting bed 2.

[0044] In this embodiment, a plurality of online near-infrared spectrometers are installed equidistantly along the flow direction of the oil shale particle bed on the second separation bed 2 in the concentration stage to measure the mixing entropy of the oil shale particle bed.

[0045] As a further optimization scheme, it also includes: multiple groups of optical fiber sensors 23 and pressure sensors 24, multiple groups of optical fiber sensors 23 and pressure sensors 24 are arranged at equal intervals along the length direction of the second sorting bed 2 on one side of its bed surface, and multiple optical fiber sensors 23 and pressure sensors 24 in each group are arranged at equal intervals vertically, and the number of each group of optical fiber sensors 23 and pressure sensors 24 gradually decreases from the feed end to the discharge end of the second sorting bed 2 to collect the bed porosity and bed density of the oil shale particle bed on the second sorting bed 2.

[0046] Reference Figure 3 , Figure 3This is a schematic diagram of the sensor arrangement of the sorting and upgrading system of this embodiment. Figure 3 As shown in the figure, the multi-source signals collected in the selection process and the ray signals of the scanning process are centrally received and fed back by the signal processor. The grade of the product is analyzed based on the scanning ray signals. When the product grade is low, the signal processor analyzes the optical signals and pressure signals of the selection process to evaluate the bed fluidization quality and bed density value, and improves the bed fluidization quality and bed density by adjusting the vibration and airflow parameters, thereby achieving a sorting environment that meets the product production requirements.

[0047] As a further optimization scheme, the concentrate discharge end and the gangue discharge end of the second sorting bed 2 are respectively provided with a radiation source and a high-pressure nozzle 3. The radiation source is arranged directly facing the outlets of the concentrate discharge end and the gangue discharge end to irradiate the concentrate and gangue outputted from the concentrate discharge end and the gangue discharge end. The high-pressure nozzle 3 is respectively fixed upwardly and tilted directly below the concentrate discharge end and the gangue discharge end.

[0048] Reference Figure 4 , Figure 4 Schematic diagram of the sorting and upgrading system of this embodiment. Figure 4 As shown, in this embodiment, in order to improve the yield of the concentrate product and reduce the gangue mixed in the concentrate product, a ray source and a high-pressure airflow nozzle are installed at the product discharge end and the gangue discharge end respectively. Through the attenuation of the ray, the gangue mixed in the product discharge end is quickly detected, and the gangue is blown out by the high-pressure airflow output by the high-pressure airflow nozzle. At the gangue discharge end, the entrained product is quickly checked, and the product is blown out by the high-pressure airflow output by the high-pressure airflow nozzle, thereby improving the product yield.

[0049] The external air source in this embodiment includes: a blast bag 8, an air bag 9, and a butterfly valve group 10. The output port of the blast bag 8 is connected to the air bag 9 through a pipeline, and the air bag 9 is connected to the butterfly valve group 10 through a pipeline. The butterfly valve group 10 is connected to the air chambers and air valves on the first sorting bed 1 and the second sorting bed 2 through pipelines.

[0050] The above disclosure is only a preferred specific embodiment of the present invention, but the embodiments of the present invention are not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A multi-stage mineral sorting and upgrading system, characterized in that: include: A first sorting bed (1) and a sorting component arranged on the first sorting bed (1) for pre-sorting oil shale particles introduced onto the bed surface of the first sorting bed (1), the sorting component comprising: A plurality of air chambers (11) are continuously arranged on the lower side of the first sorting bed (1) along the length direction thereof, and the bottoms of the air chambers are connected to an external air source via pipelines; A plurality of air distribution holes (12) are vertically arranged at equal intervals on the bed surface of the first sorting bed body (1), the air distribution holes (12) being respectively connected to the air chamber directly below them, and the gas in the air chamber is blown out from the air distribution holes (12) so that the oil shale particles on the bed surface are fluidized and move along the length direction of the bed surface; A plurality of air valves (13) are vertically fixed one by one at the bottom of the air chamber, one end of the air valve (13) is connected to the corresponding air chamber, and the other end is connected to an external air source through a pipeline. The air valve (13) outputs a pulse airflow which is blown out through the air distribution holes (12) to loosen and fluidize the oil shale particles stacked and intertwined on the bed surface.

2. The multi-stage mineral sorting and upgrading system according to claim 1 is characterized in that: The frequency of the pulse airflow on the first sorting bed (1) gradually decreases along the direction from the inlet end to the outlet end of the bed surface, and the frequency range of the pulse airflow on the first sorting bed (1) is 15 Hz-25 Hz.

3. The multi-stage mineral sorting and upgrading system according to claim 1 is characterized in that: A plurality of first vibrators (14) are arranged at equal intervals along the length direction of one side of the bed surface of the first sorting bed (1); the vibration frequency of the first vibrators (14) is in the range of 30 Hz to 50 Hz, and the amplitude is in the range of 1 mm to 3 mm.

4. The mineral multi-stage sorting and upgrading system according to claim 1 is characterized in that: A second sorting bed (2) is arranged on one side of the discharge end of the first sorting bed (1); the bed surface of the second sorting bed (2) is connected to the bed surface of the first sorting bed (1), so that the oil shale particles in a fluidized state on the bed surface of the first sorting bed (1) flow into the bed surface of the second sorting bed (2); the second sorting bed (2) is provided with a sorting component, and the arrangement method of the sorting component on the first sorting bed (1) is the same, so as to finely sort the oil shale particles flowing into the bed surface of the second sorting bed (2).

5. The mineral multi-stage sorting and upgrading system according to claim 4 is characterized in that: The frequency range of the pulsed airflow output from the second sorting bed (2) is 0-15 Hz.

6. The multi-stage mineral sorting and upgrading system according to claim 4, characterized in that: A plurality of second vibrators (21) are arranged at equal intervals along the length direction of one side of the bed surface of the second sorting bed (2); the vibration frequency range of the second vibrators (21) is 0-30 Hz, and the amplitude range is 1 mm-3 mm.

7. The multi-stage mineral sorting and upgrading system according to claim 4 is characterized in that: A material guide plate (15) is provided between the bed surface of the second sorting bed body (2) and the first sorting bed body (1); one end of the material guide plate (15) is connected to the bed surface of the first sorting bed body (1), and the other end is connected to the bed surface of the second sorting bed body (2); the material guide plate (15) is arranged to be inclined downward from one end close to the first sorting bed body (1) to the other end.

8. The mineral multi-stage sorting and upgrading system according to claim 4, characterized in that: Also includes: A plurality of online near-infrared spectrometers (22) are arranged at equal intervals on one side of the bed surface of the second sorting bed (2) along the length direction of the second sorting bed (2) to collect mixing entropy of the oil shale particle bed layer on the second sorting bed (2).

9. The mineral multi-stage sorting and upgrading system according to claim 4, characterized in that: Also includes: A plurality of groups of optical fiber sensors (23) and pressure sensors (24) are arranged at equal intervals along the length direction of the second sorting bed (2) on one side of the bed surface thereof, and the plurality of optical fiber sensors (23) and pressure sensors (24) in each group are arranged at equal intervals vertically, and the number of optical fiber sensors (23) and pressure sensors (24) in each group gradually decreases from the feed end to the discharge end of the second sorting bed (2), so as to collect the bed voidage and bed density of the oil shale particle bed on the second sorting bed (2).

10. The mineral multi-stage sorting and upgrading system according to claim 4, characterized in that: The concentrate discharge end and the gangue discharge end of the second separation bed (2) are respectively provided with a radiation source and a high-pressure nozzle (3); the radiation source is arranged directly opposite to the outlet of the concentrate discharge end and the gangue discharge end, respectively, so as to irradiate the concentrate and gangue outputted from the concentrate discharge end and the gangue discharge end; the high-pressure nozzle (3) is respectively fixed upwardly and tilted directly below the concentrate discharge end and the gangue discharge end.

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