Coarse particle mineral compound force field gravity concentrator

Abstract

The invention relates to the technical field of compound force field gravity concentration, in particular to a coarse particle mineral compound force field gravity concentration machine which comprises a machine frame, a feeding device, a separation frustum, a water supply device, a three-channel flow divider, a rotating device, an electric control device and a mineral discharging device. A plurality of sorting grooves are formed in the outer surface of the sorting frustum in a circumferential array mode, gradient bed strips are arranged on the groove faces of the sorting grooves in the direction of a sorting channel, a water supply device is arranged in each sorting groove face, a feeding device is arranged on the top of the sorting frustum, and an ore discharging device is connected to the bottom of the sorting frustum. The method has the beneficial effects that gaps between the bed strips are prevented from being mixed, secondary mixing of separated minerals is avoided, continuous separation of coarse particle minerals is achieved, the separation effect is effectively enhanced, the concentrate grade is improved, the separation and beneficiation treatment capacity is improved, the coarse particle separation efficiency is improved, and the separation efficiency and the separation quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite force field gravity separation, in particular to a composite force field gravity separation machine for coarse-grained minerals. Background Art

[0002] Gravity separation technology has long relied on mainstream equipment such as shaking tables, spiral chutes and centrifuges, but it has difficult to reconcile technical contradictions in the field of coarse particle separation. Traditional shaking tables form a composite shear force field through horizontal water flow and longitudinal vibration. The separation accuracy of fine particles (-0.074mm) can reach an enrichment ratio of more than 100:1, but its inherent structure leads to insufficient processing capacity of a single unit, too large a footprint, and poor adaptability to coarse particles. When coarse-grained minerals move on the bed surface, due to insufficient gravity sedimentation time and speed, they are prone to form agglomerates and inclusions in the gaps between the bed bars. At the same time, the spatial coupling defects between the stratification zone and the separation zone lead to secondary mixing of the separated minerals, and the recovery rate of coarse particles is generally less than 50%. Although the centrifugal concentrator enhances the recovery rate of fine particles (-0.045mm) through a centrifugal acceleration of 20-60G, it relies on a high-speed drive of more than 300rpm, and the energy consumption of a single machine exceeds 15kW. The wear rate of key components is 40% higher than that of traditional equipment, and the coarse particles (+1mm mineral particles) are more than 50% higher than that of traditional equipment. In the centrifugal field, due to the conflict between the density difference and the direction of the centrifugal force vector, a significant track deviation phenomenon occurs, and the sorting efficiency drops to below 60%. Under continuous ore feeding conditions, the centrifugal flow becomes unstable and frequent shutdowns and discharges are required. Although the spiral chute achieves a high processing capacity by virtue of the centrifugal-gravity composite field formed by the spiral structure, its trough surface structure easily leads to insufficient shear force between particle layers, and the boundary layer effect makes fine particles prone to loss. In addition, the static structural design cannot dynamically adjust parameters such as slope. When the ore particle size fluctuates, the concentrate grade fluctuates greatly, which seriously restricts the efficiency of coarse particle sorting.

[0003] The Chinese utility model patent "A rocking table device" with authorization publication number CN217795818U discloses a rocking table body; a support rod group, including two support rods, which are perpendicular to the upper surface of the rocking table body; a rotating shaft, which is arranged between the two support rods, and its two ends are rotatably connected to the two support rods; multiple reactors are fixedly arranged on the rotating shaft, and two adjacent reactors are separated by a distance in the axial direction of the rotating shaft. The rocking table device can achieve 360-degree rotation to ensure that the sample at the bottom of the reactor is in full contact with the air above the reactor; although this patent attempts to break through the bottleneck through structural complexity and motion mode innovation, the actual effect is obviously limited. The simple superposition of mechanical structure increases the complexity of the equipment by nearly 150%, while the sorting efficiency is only increased by 15% to 20%. The root cause of the poor sorting efficiency is that the coupling degree between centrifugal force and vibration shear force is less than 65%, resulting in a force field interference effect.

[0004] The Chinese utility model patent "A New Rotating Spiral Chute" with authorization publication number CN207169974U discloses that the chute is provided with a rotating frame, the rotating frame is provided with a central axis, the chute is installed on the frame through the central axis of the rotating frame, a mineral intercepting trough is provided at the lower end of the chute, the central axis of the rotating frame is connected to the motor shaft at the lower part of the frame through a coupling, and a receiving trough, i.e., a discharge guide tray, is provided at the lower part of the frame corresponding to the chute mineral intercepting trough. The receiving trough is provided with a closed-loop annular groove, and a discharge pipe is provided at the bottom of each groove; it solves the problem that when sorting finer-grained minerals, fine-grained useful minerals are easily carried to the outer circle by water and eventually flow into the middling ore or tailings end, causing the loss of useful minerals; however, due to the lack of movement coordination with the bed bars on the trough surface, the actual retention time of coarse particles is shortened by 30%, and the key parameters of the existing equipment still rely on manual experience adjustment, resulting in insufficient improvement in ore adaptability, and unable to fundamentally solve the mutually exclusive problem of continuous sorting and high precision in coarse particle sorting. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the present invention provides a coarse-grained mineral composite force field gravity concentrator, which adopts a rotating device to control the periodic motion mode of the sorting cone, and a sorting trough is arranged on the conical surface of the sorting cone. The spiral of the sorting trough surface forms an involute sorting channel with a gradually changing inclination angle from top to bottom. Combined with the gradient bed bars arranged on the sorting trough surface, the coarse-grained mineral composite force field gravity concentrator can realize continuous sorting of coarse-grained minerals, effectively enhance the sorting effect, and improve the grade of the concentrate.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A composite force field gravity separator for coarse-grained minerals comprises a frame, a feeding device, a sorting cone, a water supply device, a three-channel diverter, a rotating device, an electronic control device and a discharge device. The rotating device is fixed to the frame, and a sorting cone is arranged on the rotating device. The outer surface of the sorting cone is provided with a plurality of sorting slots in a circular array. The sorting slots spirally form an involute sorting channel from top to bottom along the conical surface of the sorting cone. Gradient bed bars are arranged on the slot surface of the sorting slot along the direction of the sorting channel. The height and spacing of the gradient bed bars decrease from the inside to the outside. The height of the gradient bed bars is 0.5 mm to 3 mm. A water supply device is arranged in each of the sorting slot surfaces. The water supply port of the water supply device faces tangentially to the sorting slot surface. The feeding device is arranged on the top of the sorting cone, and the bottom of the sorting cone is connected to the discharge device.

[0008] Furthermore, the rotating device includes a motor, a rotating shaft and a bearing. The rotating shaft is rotatably fixed on the frame through the bearing. A sorting cone is set on the rotating shaft, and the bottom end of the rotating shaft is connected to the motor.

[0009] Furthermore, the inclination angle of the involute sorting channel gradually decreases from top to bottom, the inclination angle of the top of the sorting trough is 30°~35°, and the inclination angle of the end of the sorting trough is 15°~20°; the width of the sorting trough gradually increases from top to bottom, the width of the top of the sorting trough surface is 30mm~100mm, and the width of the end of the sorting trough surface is 60mm~210mm.

[0010] Furthermore, the discharge device includes a discharge pipe and a three-channel diverter. The discharge pipe is arranged at the end of the sorting trough, and the other end of the discharge pipe is connected to the three-channel diverter. The size of each channel opening of the three-channel diverter is adjusted by an electronic control device.

[0011] Furthermore, the feeding device includes a slurry feeding plate, a feeding pipe, a flow control valve and a pressure regulating valve. The slurry feeding plate is arranged on the rotating shaft of the rotating device at the top of the sorting cone. As the sorting cone rotates, the slurry feeding plate rotates together. A feeding pipe is arranged at the bottom of the slurry feeding plate.

[0012] Furthermore, a transparent baffle is provided on the conical surface side of the sorting cone, and the transparent baffle is a semi-open baffle. The ratio of the height of the semi-open baffle to the depth of the sorting slot is controlled between 1:3 and 1:5.

[0013] Furthermore, the beneficiation method of the coarse-grained mineral composite force field gravity concentrator includes the following contents:

[0014] S1. Start-up preparation stage: The rotating device rotates flexibly, the sorting trough on the surface of the sorting cone is free of debris, and the gradient bed structure is complete and free of wear;

[0015] S2. First, the tangential water supply device is turned on. The water supply device inside the sorting tank injects pressurized water along the tangential direction of the tank surface to form a uniform liquid film inside the tank surface.

[0016] S3, the feeding device delivers the slurry into the sorting tank, and after precise control by the flow control valve, it is evenly distributed to the top inlet of each sorting tank;

[0017] S4. Start the rotating device. The electronic control device controls the movement mode of the rotating device. When the slurry flows down the trough surface, the centrifugal force and the gradual inclination angle of the trough work together to form a composite force field. The gradient bed strips drive the slurry to produce high-frequency tumbling and secondary loosening.

[0018] S5. Under the action of centrifugal force and gradient bed strips, high-density heavy particles converge toward the center of the sorting cone along the inner spiral line; low-density light particles are pushed to the outer edge and move rapidly outward under the impetus of tangential water flow and shear force; the inner edge channel of the sorting trough collects concentrate, the middle channel collects re-selectable middlings, and the outer edge channel discharges tailings. The three-channel diverter adjusts the opening angle of each channel through the electronic control device to collect the concentrate, middlings and tailings sorted by the sorting trough.

[0019] Furthermore, in step S4, the motion mode is periodic alternating forward and reverse rotation, the reverse rotation cycle time is 40% to 50% of the forward rotation cycle time, and the reverse rotation linear speed is 1.5 to 1.8 times the forward rotation linear speed.

[0020] Furthermore, the movement mode in step S4 is periodic intermittent reverse rotation.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) Based on the differences in particle size and density during the separation of coarse-grained minerals, the present invention accurately designs the inclination angle of the sorting trough surface and the distribution structure of the bed bars. Combined with the periodic motion mode of the rotating device, it prevents inclusions in the gaps between the bed bars and avoids secondary mixing of separated minerals, thereby achieving continuous sorting of coarse-grained minerals, effectively enhancing the sorting effect, improving the grade of the concentrate, increasing the processing capacity of the sorted ore, improving the coarse-grained sorting efficiency, improving the sorting efficiency, and improving the sorting quality.

[0023] 2) Under the action of the centrifugal field, the bed strip structure causes the coarse particle group to produce high-frequency rolling and secondary loosening, which can reduce the friction resistance of mineral particles by more than 40% and significantly increase the stratification speed of light and heavy minerals.

[0024] 3) The trough surface design of the frustum outer surface forms an involute sorting channel with a gradual inclination angle of 30° to 15°. The trough surface width widens from top to bottom, which not only ensures the high-intensity force field of 1 to 3G in the centrifugal sorting area, but also extends the migration path of mineral particles through gravity sorting at the spiral inclination, increases the sorting residence time to more than twice that of conventional sorting equipment, and improves the concentrate grade stability to ±0.5%, thereby improving the concentrate sorting efficiency and sorting quality.

[0025] 4) The motor directly drives the sorting cone in a periodic, alternating rotational motion mode, creating a "stratification-loosening-enhanced stratification-retention" effect in the mineral layers. This motion mode, combined with the spiral structure of the sorting trough surface, allows dense mineral particles to undergo continuous and enhanced centrifugal compaction as they descend along the inner spiral line, while light particles are rapidly discharged at the outer edge due to the combined force of shear force and tangential water flow. This achieves efficient and continuous separation of coarse particles, significantly increasing processing capacity and reducing energy consumption by approximately 20% compared to traditional centrifugal equipment. This significantly increases large-scale production capacity while maintaining sorting accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of a composite force field gravity separator for coarse-grained minerals described in the present invention.

[0027] Figure 2 This is a schematic diagram of the sorting tank structure of the present invention.

[0028] Figure 3 This is the first motion mode of the rotating device described in the present invention.

[0029] Figure 4 This is the second motion mode of the rotating device described in the present invention.

[0030] Markings in the figure: 1. Frame; 2. Bearing; 3. Feeding device; 4. Sorting trough; 5. Sorting cone; 6. Water supply device; 7. Gradient bed strips; 8. Rotating shaft; 9. Motor. DETAILED DESCRIPTION

[0031] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0032] like Figures 1-4As shown, a composite force field gravity concentrator for coarse-grained minerals includes a frame 1, a feeding device 3, a sorting cone 5, a water supply device 6, a three-channel diverter, a rotating device and an electronic control device. The rotating device is fixed on the frame 1. The rotating device includes a motor 9, a rotating shaft 8 and a bearing 2. The upper and lower ends of the rotating shaft 8 are connected to the bearing 2 to ensure the rotation stability of the rotating shaft 8. The bearing 2 is fixed on the frame 1. The bottom end of the rotating shaft 8 is connected to a direct-drive rotating motor 9, which can achieve stepless speed regulation of 0 to 150 rpm. The motor 9 controls the speed and direction through a frequency converter and a commutator to achieve periodic forward and reverse rotation of the equipment, produce a periodic compression-expansion effect, strengthen the mineral stratification, and allow the mineral particles to be intercepted by the gradient bed 7. A sorting cone 5 is provided on the rotating device. The sorting cone 5 is a cone structure. Five spiral downward sorting slots 4 are provided on the outer surface of the sorting cone 5 in a circular array. The sorting slots 4 are coaxially stacked. After stacking, the processing capacity of a single module is significantly improved, and the total energy consumption is reduced by about 20% compared with traditional centrifugal equipment. The sorting slots 4 spiral from top to bottom along the conical surface of the sorting cone 5 to form an involute sorting channel. The inclination angle of the slot surface of each spiral sorting slot 4 gradually slows down from 30° at the top to 15° at the end, and the slot surface width expands from 30 mm to 150 mm from top to bottom, forming an involute sorting channel, ensuring that a composite force field of 1 to 3G is formed in the centrifugal sorting area, and at the same time, the migration path of the mineral particles is extended by gradually changing the inclination angle. The surface of the sorting trough 4 is provided with gradient bed strips 7 along the direction of the sorting channel. The gradient bed strips 7 are designed with a downstream folding pattern and are arranged along the direction of slurry flow. The height and spacing of the gradient bed strips 7 decrease from the inside to the outside. The height of the gradient bed strips 7 is 0.5mm to 3mm, which can reduce the friction resistance of the mineral particles by more than 40% and promote high-frequency tumbling and secondary loosening of the particles. A water supply device 6 is provided in each of the sorting troughs 4. The water supply device 6 injects pressurized water along the tangential direction of the trough surface of the sorting trough 4 to form a uniform liquid film on the inner side of the trough surface to suppress the boundary layer effect and lubricate the particle movement path. By observing the water flow distribution in the transparent baffle, the water supply pressure flow regulating valve is adjusted to ensure that the liquid film thickness in each spiral trough surface is consistent, and the liquid film thickness is 5 to 10mm. A feeding device 3 is provided on the top of the sorting cone 5, and the bottom of the sorting cone 5 is connected to the ore discharge device.

[0033] Furthermore, the discharge device includes a discharge pipe and a three-channel diverter. The discharge pipe is arranged at the end of the sorting trough, and the other end of the discharge pipe is connected to the three-channel diverter. The opening size of each channel of the three-channel diverter is adjusted by an electric control device, and the adjustment accuracy error is ≤±2°. The discharge end at the end of the sorting trough adjusts the discharge position of the concentrate, middlings and tailings according to the difference in mineral density. The discharge ends of the five sorting troughs 4 are collected to the three-channel diverter through the closed discharge pipe, and the three-channel diverter realizes continuous separation of the three products. The inner edge channel of the three-channel diverter collects the concentrate, the middle channel collects the middlings that can be reselected, and the outer edge channel discharges the tailings. The middlings can re-enter the roughing process through the return system to improve resource utilization.

[0034] Furthermore, the feeding device 3 includes a slurry feeding plate, a feeding pipe, a flow control valve and a pressure regulating valve. The slurry feeding plate is arranged on the rotating shaft 8 of the rotating device at the top of the sorting cone 5. As the sorting cone 5 rotates, the slurry feeding plate rotates together. The same number of feeding pipes are arranged at the bottom of the slurry feeding plate according to the number of sorting slots 4. Each feeding pipe corresponds to a sorting slot 4. The flow control valve and the pressure regulating valve adjust the slurry flow rate and concentration in real time to ensure that the thickness of the ore layer in the sorting slot 4 is consistent.

[0035] Furthermore, the sorting tank 4 is provided with a transparent baffle on the conical surface side of the sorting cone 5. The transparent baffle is a semi-open baffle. The ratio of the height of the semi-open baffle to the depth of the sorting tank is controlled between 1:3 and 1:5, which can not only prevent the slurry from overflowing, but also facilitate the observation of the sorting effect and dynamic adjustment of parameters.

[0036] Furthermore, the beneficiation method of the coarse-grained mineral composite force field gravity concentrator includes the following contents:

[0037] S1. Startup preparation stage: The rotating device rotates flexibly, the sorting trough 4 on the surface of the sorting cone 5 is free of debris, and the gradient bed 7 is intact and free of wear;

[0038] S2. First, the tangential water supply device 6 is turned on. The water supply device 6 inside the sorting tank 3 injects pressurized water along the tangential direction of the tank surface to form a uniform liquid film inside the tank surface;

[0039] S3, the feeding device 3 delivers the slurry into the sorting tank 4, and after precise control by the flow control valve, it is evenly distributed to the top inlet of each spiral groove surface;

[0040] S4. Start the rotating device. The electronic control device controls the movement mode of the rotating device. When the slurry moves downward along the trough surface of the separation trough 4, the centrifugal force and the gradual inclination angle of the separation trough work together to form a composite force field. The gradient bed strips 7 drive the slurry to produce high-frequency tumbling and secondary loosening.

[0041] S5. High-density heavy particles converge toward the center of the sorting cone 5 along the inner spiral line under the action of centrifugal force and the blocking of the gradient bed strips 7, and are subjected to the enhanced stratification effect of the periodic compression-expansion effect; low-density light particles are pushed toward the outer edge and move rapidly outward under the impetus of the tangential water flow and shear force; the inner edge channel of the sorting trough 4 collects the concentrate, the middle channel collects the re-selected middlings, and the outer edge channel discharges the tailings. The three-channel diverter adjusts the opening angle of each channel through the electronic control device to collect the concentrate, middlings and tailings sorted by the sorting trough 4.

[0042] like Figure 3As shown, further, in the step S4, the motion mode is periodic alternating forward and reverse rotation, and the motor drives the sorting cone 5 to complete a forward rotation of 120° to 180° at a linear speed of 1 to 1.5 m / s. The low-speed rotation allows the mineral particles to obtain sufficient centrifugal action time in the sorting tank 4; when the motor completes the forward rotation, it quickly switches to the reverse mode and drives the sorting cone 5 to rotate about 90° in the reverse direction at a linear speed of 1.5 to 2.5 m / s. The sudden increase in the reverse speed produces an inertial impact effect: light particles have small mass and low inertia and cannot respond quickly to changes in the rotation direction. Their motion trajectory is strongly disturbed and they are intercepted by the gradient bed 7 and thrown toward the outer edge of the sorting tank 4 with the reverse centrifugal force. However, heavy particles have large inertia and high momentum and still maintain their original motion trend. They continue to gather toward the inner edge and bottom of the sorting tank 4 and are then discharged into the three-channel diverter through the discharge pipe.

[0043] like Figure 4 As shown, further, the movement mode in step S4 is periodic intermittent reverse rotation, the mineral particles enter the sorting tank 4 at a certain lower speed, and the sorting cone 5 is periodically rotated in the opposite direction of the slurry flow, with a linear speed of 0.5 to 1.5 m / s, which can also produce the same "stratification-loosening-enhanced stratification-retention" effect of light and heavy particles as the periodic positive and negative alternating rotation effect.

[0044] Example:

[0045] Example 1-Example 2 is a copper-molybdenum ore separation experiment:

[0046] The test material was copper-molybdenum ore, and the two motion modes were used to separate the material. The experimental data are shown in Table 1.

[0047] Table 1 Sorting results of the two equipment motion modes of Example 1-Example 2:

[0048]

[0049]

[0050] Example 3-Example 4 is a copper oxide tungsten ore separation experiment

[0051] The test material was copper oxide tungsten ore, and the two motion modes were used to separate the material. The experimental data is shown in Table 2.

[0052] Table 2 Sorting results of the two equipment motion modes of Example 3-Example 4:

[0053]

[0054] The above-mentioned sorting experimental data prove that the method of the present invention can discard qualified tailings and obtain higher-grade coarse concentrate as flotation feed, which can greatly reduce the flotation ore volume and reagent consumption. After sorting, only part of the middlings are returned to the regrinding operation, which greatly reduces the mineral processing production cost.

[0055] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A composite force field gravity concentrator for coarse-grained minerals, comprising a frame, a feeding device, a separation cone, a water supply device, a three-channel diverter, a rotating device, an electronic control device, and a discharge device, characterized in that: The rotating device is fixed on the frame, and a sorting cone is arranged on the rotating device. The outer surface of the sorting cone is provided with a plurality of sorting slots in a circular array. The sorting slots spirally form an involute sorting channel from top to bottom along the conical surface of the sorting cone. The slot surface of the sorting slot is provided with gradient bed bars along the direction of the sorting channel. The height and spacing of the gradient bed bars decrease from the inside to the outside, and the height of the gradient bed bars is 0.5mm to 3mm; a water supply device is provided in the surface of each sorting slot, and the water supply port of the water supply device is tangentially facing the sorting slot surface. A feeding device is provided on the top of the sorting cone, and the bottom of the sorting cone is connected to a discharge device.

2. A coarse-grained mineral composite force field gravity concentrator according to claim 1, characterized in that: The rotating device includes a motor, a rotating shaft and a bearing. The rotating shaft is rotatably fixed on the frame through the bearing. A sorting cone is set on the rotating shaft, and the bottom end of the rotating shaft is connected to the motor.

3. The coarse-grained mineral composite force field gravity concentrator according to claim 1, characterized in that: The inclination angle of the involute sorting channel gradually decreases from top to bottom, the inclination angle of the top of the sorting trough is 30°~35°, and the inclination angle of the end of the sorting trough is 15°~20°; the width of the sorting trough gradually increases from top to bottom, the width of the top of the sorting trough is 30mm~100mm, and the width of the end of the sorting trough is 60mm~210mm.

4. The coarse-grained mineral composite force field gravity concentrator according to claim 1, characterized in that: The discharge device includes a discharge pipe and a three-channel diverter. The discharge pipe is arranged at the end of the sorting trough, and the other end of the discharge pipe is connected to the three-channel diverter. The size of each channel opening of the three-channel diverter is adjusted by an electronic control device.

5. The coarse-grained mineral composite force field gravity separator according to claim 1, characterized in that: The feeding device includes a slurry feeding plate, a feeding pipe, a flow control valve and a pressure regulating valve. The slurry feeding plate is arranged on the rotating shaft of the rotating device at the top of the sorting cone. As the sorting cone rotates, the slurry feeding plate rotates together. A feeding pipe is arranged at the bottom of the slurry feeding plate.

6. The coarse-grained mineral composite force field gravity separator according to claim 1, characterized in that: The sorting trough is provided with a transparent baffle on the conical surface side of the sorting cone. The transparent baffle is a semi-open baffle. The ratio of the height of the semi-open baffle to the depth of the sorting trough is controlled between 1:3 and 1:

5.

7. A method for beneficiating coarse-grained minerals using a composite force field gravity concentrator according to claim 1, characterized in that: The beneficiation method of the coarse-grained mineral composite force field gravity concentrator includes the following contents: S1. Start-up preparation stage: The rotating device rotates flexibly, the sorting trough on the surface of the sorting cone is free of debris, and the gradient bed structure is complete and free of wear; S2. First, the tangential water supply device is turned on. The water supply device inside the sorting tank injects pressurized water along the tangential direction of the tank surface to form a uniform liquid film inside the tank surface. S3, the feeding device delivers the slurry into the sorting tank, and after precise control by the flow control valve, it is evenly distributed to the top inlet of each sorting tank; S4. Start the rotating device. The electronic control device controls the movement mode of the rotating device. When the slurry flows down the trough surface, the centrifugal force and the gradual inclination angle of the trough work together to form a composite force field. The gradient bed strips drive the slurry to produce high-frequency tumbling and secondary loosening. S5. Under the action of centrifugal force and gradient bed strips, high-density heavy particles converge toward the center of the sorting cone along the inner spiral line; low-density light particles are pushed to the outer edge and move rapidly outward under the impetus of tangential water flow and shear force; the inner edge channel of the sorting trough collects concentrate, the middle channel collects re-selectable middlings, and the outer edge channel discharges tailings. The three-channel diverter adjusts the opening angle of each channel through the electronic control device to collect the concentrate, middlings and tailings sorted by the sorting trough.

8. The beneficiation method of the coarse-grained mineral composite force field gravity concentrator according to claim 7, characterized in that: In step S4, the motion mode is periodic alternating forward and reverse rotation, the reverse rotation period is 40% to 50% of the forward rotation period, and the reverse rotation linear speed is 1.5 to 1.8 times the forward rotation linear speed.

9. The beneficiation method of the coarse-grained mineral composite force field gravity concentrator according to claim 7, characterized in that: The movement mode in step S4 is periodic intermittent reverse rotation.

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