Calcite solid waste resource color selection iron removal device

Abstract

The present application relates to a kind of calcite solid waste resourceization color selection iron removal device, the device is inclined and provided with cascade slide plate flow uniformizing component below discharge pipe;The component is divided into independent discharge passage by multiple parallel static partition plates;Staircase is arranged in the passage with multiple levels of independent slide plate with inverted trapezoidal section.The upper part of independent slide plate is articulated, and the lower part of suspension end is connected with elastic support;The suspension end of upper slide plate covers the articulated end of lower slide plate, and its discharge drop point is positioned at the articulated shaft of lower level.The alternating torque caused by material falling is used to drive slide plate high-frequency flutter, and double-stage dynamic composite stretching and transverse collapse are carried out on clumped material, which reshapes it into unobstructed single-layer powder waterfall, improves the recognition accuracy of photoelectric color selection and high-white-precision material output rate.The problem that extremely dry and fine calcite powder is easily electrostatically clumped during color selection feeding, leading to optical obstruction and uneven discharge, is solved.

Description

Technical Field

[0001] This invention relates to the field of mining solid waste resource utilization technology, specifically to a color sorting and iron removal device for the resource utilization of calcite solid waste. Background Technology

[0002] Calcite mining tailings solid waste has recycling value. After crushing and screening, it usually enters the photoelectric color sorting and deep iron removal stage. Photoelectric color sorting equipment is used to remove impurities in the material, and iron removal device is used to separate weakly magnetic iron-containing impurities.

[0003] However, the fine powder processed from calcite mine tailings has a large specific surface area and is extremely light. During the feeding process, it is prone to agglomeration due to static electricity and van der Waals forces, forming thick and dense material strands, which seriously affects the color sorting accuracy.

[0004] When addressing engineering challenges such as powder caking or uneven feeding in chutes, a common approach is to use a rigid linkage mechanism controlled by an external high-frequency vibrator to apply forced vibration to the entire feeding pipeline. For example, Chinese invention patent document CN107344174B discloses a structural device for a graded vibration feeding system for an ore color sorter. This system relies on sensors to monitor the pipeline gravity in real time and uses an electrically controlled coupling vibration device to intervene in the entire feeding pipeline. However, this type of whole-machine vibration solution, when dealing with extremely fine and light calcite powder, not only fails to provide sufficient local transient deformation at the microscopic level to break the shear yield stress inside the agglomerated powder, but also easily causes the powder agglomerates to further compact under continuous rigid mechanical pressure. Furthermore, the overall oscillation easily causes large-scale dust to be stirred up at the open feeding port end and adhere to the optical lenses and background plate of the color sorter, leading to background distortion and blindness in recognition.

[0005] The aforementioned defects prevent impurities trapped deep within the thick material flow and flawed particles with "yin-yang" surfaces that slide along the wall on one side from being effectively exposed to the photoelectric detection system, resulting in a high rate of missed selection in the finished product and significant fluctuations in purification quality. Summary of the Invention

[0006] The purpose of this invention is to provide a color sorting and iron removal device for the resource utilization of calcite solid waste, in order to solve the technical problem in the prior art that fine powder cannot be quickly separated, resulting in the formation of thick and dense continuous material streams, which affects the subsequent color sorting rate.

[0007] The technical solution of the color sorting and iron removal device for calcite solid waste resource utilization of the present invention is as follows:

[0008] The color sorting and iron removal device for calcite solid waste resource utilization includes:

[0009] frame;

[0010] The feeding pipe is located above the machine frame;

[0011] The cascaded slide plate flow equalization assembly is inclinedly mounted on the frame and located below the feed pipe. It includes multiple partition plates arranged parallel to each other along the longitudinal direction, as well as multiple slide plate arrays.

[0012] A feeding channel is formed between two adjacent partition plates, and each set of the sliding plate array is respectively arranged in the feeding channel;

[0013] The slide array includes at least two independent slides arranged sequentially along the material flow direction. Each independent slide has an upper hinged end and a lower suspended end. The hinged end is rotatably mounted on the frame or partition plate, and an elastic support is connected between the bottom side of the suspended end and the frame.

[0014] The two adjacent independent slide plates are arranged in a stepped manner, and the projection of the suspended end of the upper independent slide plate in the vertical direction along the material flow direction at least partially covers the hinge end of the lower independent slide plate.

[0015] The projection of the end edge of the suspended end of the upper-level independent slide plate along the material flow direction in the vertical direction intersects or is adjacent to the hinge axis of the hinge end of the lower-level independent slide plate, so that the discharge point of the upper-level independent slide plate is located at the hinge axis position of the lower-level independent slide plate.

[0016] Furthermore, the cross-section of the independent sliding plate is an inverted trapezoidal structure that is wider at the top and narrower at the bottom, so that there is a gradually increasing gap between the left and right side walls of the independent sliding plate and the side walls of the adjacent partition plate from top to bottom.

[0017] Furthermore, the thickness of the independent sliding plate gradually decreases from the hinged end to the suspended end.

[0018] Furthermore, between two adjacent independent skateboards, a flexible baffle skirt connects the bottom surface of the suspended end of the upper independent skateboard to the hinged end of the lower independent skateboard.

[0019] Furthermore, the top edge of the partition plate is an upwardly protruding acute-angled blade structure, and the height of the acute-angled blade structure is higher than the upper surface of the independent sliding plate.

[0020] Furthermore, a flow guide groove is provided between the feed pipe and the cascaded slide plate flow equalization assembly. The width of the flow guide groove is equal to the total span formed by multiple partition plates. The longitudinal section of the flow guide groove is a J-shaped curved surface with variable curvature. The discharge tangent direction at the tail of the flow guide groove is parallel to the extension direction of the top independent slide plate of the slide plate array in its natural state.

[0021] Furthermore, the tail discharge edge of the guide channel is provided with multiple slits, and the position of each slit corresponds to penetrating the partition plate.

[0022] Furthermore, the elastic support includes a nonlinear variable pitch helical spring and a limiting structure disposed between the suspended end and the frame. The limiting structure limits the maximum downward tilt angle and the maximum upward tilt angle of the independent sliding plate around the hinge end.

[0023] The beneficial effects of this application are as follows: by using partition plates to separate wide chutes and arranging independent sliding plates with elastic supports in a stepped manner within the channel, on the one hand, since the discharge point of the upper-level independent sliding plate is precisely positioned at the hinge axis of the lower-level independent sliding plate, when the material falls, the dynamic downward torque generated is close to zero, which allows the independent sliding plate to receive the material in a stable posture, avoiding hard impact and dust caused by premature pressure collapse.

[0024] On the other hand, the cantilevered elastic hinge structure of the independent slide plate applies a destructive dynamic composite stretching to the agglomerated material. As the material clump slides along the independent slide plate from the hinge end to the suspended end, its gravitational lever arm gradually increases. The resulting alternating torque overcomes the resistance of the elastic support, forcing the independent slide plate to pivot downwards and steepen its tilt angle. The material has a large downward acceleration, causing the sliding speed of the front end of the clump to be greater than that of the rear end, thus creating a speed difference stretching in the longitudinal direction of the material flow, forcibly thinning the material layer thickness. In addition, when the front part of the stretched clump flies away from the end of the suspended end, while the remaining rear half of the material remains on the plate, the independent slide plate rebounds violently upwards and resets under the action of the elastic support due to the instantaneous load reduction. This instantaneous upward movement causes misalignment and elongation between the front material flying away and the rear material that is forced to lift and decelerate, thus subjecting the material clump to relative stretching and tearing again.

[0025] Through the ingenious spatial connection between the two-stage slide plates, and the intervention of the slide plates themselves under load, which causes compression and elasticity and stretching, the originally dense, heavy, and electrostatically aggregated continuous calcite powder flow is forcibly stripped and deagglomerated within a limited sliding distance. Before leaving the chute and entering the optical color sorting area, it is reshaped into a uniform, sparse, and unobstructed single-layer two-dimensional powder, avoiding the hidden space of the yin-yang surface and internal impurities, and effectively improving the rejection purity and accuracy of photoelectric color sorting. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a specific embodiment of the color sorting and iron removal device for the resource utilization of calcite solid waste of the present invention. Figure 2 for Figure 1 A partial structural diagram of the cascaded slide plate flow equalization assembly; Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle; Figure 4 for Figure 2 A schematic diagram of the axonal structure; Figure 5 for Figure 2 A cross-sectional structural diagram of the central partition plate and the independent sliding plate.

[0027] In the diagram: 1-Frame; 2-Feeding pipe; 3-Guide channel; 4-Cascaded slide plate flow equalization assembly; 5-Separator plate; 6-Independent slide plate; 7-Hinged end; 8-Suspension end; 9-Elastic support; 10-Flexible baffle skirt; 11-Acute angle cutting edge structure; 12-Cutting slit; 13-Hinged shaft. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0030] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0032] A specific embodiment of the color sorting and iron removal device for the resource utilization of calcite solid waste according to the present invention is as follows: Figures 1 to 5 As shown, this technology is mainly applied to the high-value resource utilization process of calcite mine tailings solid waste. Specifically, the existing process involves primary crushing of the calcite mine tailings solid waste to control the particle size range; washing and screening to remove mud, dust, and impurities to obtain 10-120 mesh washed granules; and then controlling the moisture content and drying to ≤1% to ensure the stability of subsequent sorting. The dried granules are then fed into a color sorting device for sorting according to whiteness, hue, and impurity content: primary color sorting separates high-white base material; secondary color sorting separates ordinary white material; and tertiary color sorting separates colored material from mixed-color material, achieving precise grading by quality. The high-white base material and ordinary white material are then fed into a high-intensity magnetic deep iron removal system, using a combination of dry strong magnetic and high-gradient magnetic separation to deeply remove magnetic and weakly magnetic iron impurities, ensuring that the high-white refined material has Fe2O3 ≤20ppm and the ordinary white material has Fe2O3 ≤150ppm. High-whiteness concentrate is used in high-end ultra-clear glass and photovoltaic glass; ordinary whiteness concentrate is used in ordinary flat glass and bottle glass; colorants and mixed-color materials are used in colored glass, building material fillers, and desulfurizers; fine powder tailings are used in feed-grade calcium carbonate; washed granules can be directly sold or recycled for purification, increasing the yield of high-whiteness concentrate. Intermediate materials and return materials generated from color sorting and iron removal are recycled back into the drying, color sorting, and iron removal processes for purification, maximizing the yield of high-whiteness concentrate and achieving 100% utilization of solid waste with zero tailings discharge.

[0033] When calcite dry powder is fed into the color sorting process, the dried powder accumulates a very high density of disordered static charge on the particle surface after being transported and tumbled through pipelines. Simultaneously, the inherent van der Waals forces between the fine particles become particularly strong after the loss of moisture and the separation by liquid bridges. This directly causes the fine mineral powder, which should have slid off in a discrete, individual state, to undergo extremely stubborn mutual adsorption and agglomeration on the gravity feed chute of the color sorter. The material aggregates into thick, dense, continuous strips, preventing the optical camera from capturing yellow spots, black dots, and other discolored minerals hidden deep within the strips. Furthermore, the particles slide along the wall in a "yin-yang" pattern, completely losing the possibility of 360-degree exposure, thus severely limiting the color sorting yield of high-whiteness concentrate. Based on the above physical conditions, this invention solves the aforementioned problems by relying on the powder's own gravitational potential energy to drive local microscopic changes.

[0034] Specifically, the device includes a frame 1, with a feed pipe 2 fixedly installed at the top feeding area of ​​the frame 1. The feed pipe 2 is used to receive continuously conveyed calcite powder. Below the feed pipe 2, along the path where the material naturally slides down by gravity, a cascaded slide plate flow equalization assembly 4 is installed at an angle. This cascaded slide plate flow equalization assembly 4 is a material conveying platform composed of a static isolation frame and a dynamic array module.

[0035] To eliminate lateral interference and motion crosstalk between material flows in different areas, multiple high-strength partition plates 5 are fixedly installed parallel to each other on the frame 1 along the longitudinal direction of material flow. This uniformly divides the originally unconstrained chute into multiple independent, non-interconnected feeding channels. To prevent the extremely dry powder falling from the upper feeding pipe 2 from accumulating on the top of the partition plates 5, the top edges of the partition plates 5 are upward-protruding acute-angled cutting edge structures 11. The height of these acute-angled cutting edge structures 11 is higher than the upper surface of the topmost moving part within the feeding channel. The vertically falling agglomerated powder is forced to flow to both sides along the two inclined surfaces of the cutting edge, falling into the independent feeding channels on both sides, eliminating flat-top material accumulation within the system.

[0036] Within each independent feeding channel, a corresponding array of sliding plates is configured. Each array consists of at least two independent sliding plates 6 arranged sequentially in a stepped manner along the material flow direction. From a top-down view, the sliding plate arrays in multiple channels present a dense matrix arrangement resembling piano keys.

[0037] For a single independent slide plate 6, it has a hinged end 7 located at the upper position in space (i.e., near the feed end) and a suspended end 8 located at the lower position in space (i.e., near the discharge end). The hinged end 7 is rotatably mounted on the crossbeam of the frame 1 or the partition plates 5 on both sides via a bearingless flexible polyurethane connecting strip or a precision hinge shaft structure; while the suspended end 8 is in a free-floating state, and its bottom surface is connected to the fixed support surface of the frame 1 by an elastic support member 9, so that each independent slide plate 6 constitutes a single-arm cantilever beam structure supported by an elastic element.

[0038] The independent sliding plate 6 has an inverted trapezoidal cross-section that is wider at the top and narrower at the bottom. This inverted trapezoidal cross-section creates a gradually increasing, divergent gap between the left and right sloping walls of the independent sliding plate 6 and the vertical sidewalls of the adjacent partition plate 5. When the independent sliding plate 6 oscillates up and down at high frequency during operation, this gap continuously expands in a funnel shape in the vertically downward direction. Any extremely fine dust that occasionally leaks into this gap from the top edge of the sliding plate cannot find a support point between the two walls to form effective lateral mechanical compression. Instead, the reciprocating motion of the sliding plate continuously scrapes the dust that leaks into the gap downwards, and the dust falls directly out without hindrance under the combined effect of gravity and the divergent gap.

[0039] The thickness of the independent sliding plate 6 exhibits a monotonically decreasing wedge-shaped variation from the hinged end 7 towards the suspended end 8, causing the end edge of the suspended end 8 to eventually converge into a streamlined, blade-like structure. This weight distribution, thicker at the top and thinner at the bottom, reduces the unbalanced mass at the end of the cantilever structure and decreases the moment of inertia. As a result, after the suspended end 8 loses the pressure of the material, it can instantly rebound with extremely high acceleration under the drive of the elastic support 9, providing high-frequency, brittle elastic force.

[0040] Furthermore, to ensure that no material leakage occurs during the transfer from the upper independent slide plate 6 to the lower independent slide plate 6, and to prevent disruption of the independent self-excited oscillation of each slide plate, a flexible baffle skirt 10 made of wear-resistant and highly elastic polymer material such as Teflon is extended and fixed to the bottom surface of the suspended end 8 of the upper independent slide plate 6 along the material flow direction. This flexible baffle skirt 10 extends downwards along the material flow direction, and its free lower end is fixed to the upper surface of the hinge end 7 of the lower independent slide plate 6 in its natural state. During system operation, when the upper or lower slide plate experiences high-frequency, asynchronous up-and-down pitching due to changes in material load, the flexible baffle skirt 10 can adaptively bend and deform to accommodate the drastic changes in the angle between the two rigid slide plates. It always tightly shields the joint area between the two plates from directly above, guiding the passed dry powder to the surface of the lower slide plate.

[0041] The two adjacent independent slide plates 6 are arranged in a stepped manner with their ends overlapping. This is represented by the projection of the suspended end 8 of the upper independent slide plate 6 in the vertical direction. At least part of the projection will cover the hinge end 7 of the lower independent slide plate 6 to ensure the continuity of material transfer.

[0042] The geometric projection of the discharge edge at the suspended end 8 of the upper-level independent slide plate 6 along the material flow direction in the vertically downward direction intersects or is adjacent to the axis of the hinge axis 13 of the hinged end 7 of the lower-level independent slide plate 6. Since the projection of the discharge edge is directly aligned with the hinge axis 13 of the lower level, when the material discharged from the upper-level slide plate falls heavily onto the lower-level slide plate, the landing point is precisely located in the area where the lever arm of the lower-level cantilever beam is extremely small. Therefore, even if the material clump falling instantaneously is extremely thick, the downward dynamic torque it generates is close to zero, ensuring that the lower-level slide plate will not be prematurely crushed and collapsed when receiving the material. This makes the smooth transfer of material and the subsequent self-excited rebound action of the slide plate generated by the material sliding down staggered on the time axis, eliminating the blind disturbance caused by the continuous material flow impact.

[0043] To prevent vertically falling agglomerated material from directly impacting the top sliding plate and causing fatigue damage and dust explosions, a guide channel 3 is provided between the feed pipe 2 and the top independent sliding plate 6. This guide channel 3 is fixed to the frame 1, and its lateral width is exactly equal to the total span formed by the parallel arrangement of multiple partition plates 5, thus accommodating the entire material flow. The longitudinal section of the guide channel 3 is a J-shaped curved surface (or a parabolic-like surface) with varying curvature. When vertically falling calcite powder impacts the upper end of the J-shaped curved surface, its vertical gravitational potential energy is gradually dissipated along the smoothly transitioning surface and gently converted into tangential kinetic energy sliding down the slope. Furthermore, the discharge tangent direction at the tail of the guide channel 3 is parallel to the extension direction of the top independent sliding plate 6 in its natural state. When the material leaves the guide channel 3 and enters the dynamic sliding plate array, it smoothly slides onto the first-level independent sliding plate 6, improving the system's operational stability.

[0044] The tail discharge edge of the guide channel 3 has multiple comb-shaped slits 12. These slits 12 correspond precisely to and penetrate the multiple partition plates 5 below. The free ends of each comb-shaped suspended segment divided by the slits 12 at the tail of the guide channel 3 are flexibly attached to the upper surface of the hinge end 7 of the top independent slide plate 6 inside the corresponding discharge channel.

[0045] The aforementioned elastic support 9 employs a non-linear variable pitch helical spring. In actual operation, when the flow rate is low and the particles are light, the coil section with a larger pitch and softer stiffness in the helical spring takes effect first, providing extremely sensitive high-frequency micro-amplitude vibration for the independent slide plate 6 to cope with slight electrostatic adhesion. However, when large clumps of solid material suddenly fall into the system or when it encounters severe overload, the slide plate is pressed down significantly, and the coil section with a smaller pitch and extremely high stiffness in the spring intervenes, generating a strong rebound thrust at the moment the heavy-load material is released, ensuring that the system's forced dispersing ability never diminishes. At the same time, to prevent system damage caused by continuous powder avalanche under extreme working conditions, a limiting structure (such as a sleeve tie rod mechanism) is also installed in parallel within the elastic support 9. This limiting structure limits the maximum downward tilt angle of the independent slide plate 6 around the hinge end 7 and the maximum upward tilt angle when subjected to rebound; the maximum tilt angle is greater than or equal to the natural angle of repose of the calcite powder. This ensures that even if the elastic element completely fails and the slide is pressed to its lowest physical limit, the material can still be discharged by gravity because its angle of inclination is still greater than its angle of repose.

[0046] The specific working principle and microscopic state evolution are as follows:

[0047] Calcite powder is continuously fed into feed pipe 2. This extremely dry powder falls into the guide trough 3 below feed pipe 2 in an irregular, heavy flow. Under the gentle support and rectification of the variable curvature J-shaped surface of guide trough 3, the potential energy of the vertical impact is converted into tangential kinetic energy for smooth downward movement, avoiding the dust generated by the collision. Subsequently, the wide flow slides to the end of guide trough 3 and is cut by the sharp-angled edge of the top of the partition plate 5, forcibly dividing the flow into multiple parts, which are then fed into their respective independent feed channels, smoothly cutting into the hinge area of ​​the top independent slide plate 6 in each channel.

[0048] As a locally thick calcite mass slides down the surface of a certain independent slide plate 6 from the upper hinged end 7 to the lower suspended end 8, according to the lever principle, as the center of gravity of the material continues to slide downwards, the downward gravitational torque it exerts on the elastic support 9 of the suspended end 8 increases geometrically. This large torque quickly overcomes the preload of the nonlinear spring, forcing the suspended end 8 of the independent slide plate 6 to swing downwards, steepening the slide plate's angle and giving the mass a greater downward acceleration. Because the front part of the mass enters the steeper lower acceleration zone earlier, its sliding speed is much greater than that of the rear part, which is still moving slowly near the hinged end 7. Under this difference in speed, the thick mass, originally clumped together due to electrostatic force, is stretched longitudinally. According to the principle of continuity in fluid mechanics, under the premise of a constant flow rate, the faster the sliding speed, the thinner the cross-sectional thickness of the material flow. Thus, this thick mass is forcibly thinned into a thin powder flow by the first stage of stretching.

[0049] When the initial elongated part of the material clump flies away from the suspended end 8 at an extremely high final velocity, while the rear part of the clump remains on the independent slide plate 6, the overall load on the independent slide plate 6 is instantly and significantly reduced due to the detachment of the front material. The extremely compressed bottom nonlinear spring drives the independent slide plate 6 to rebound upward from its steep state and return to a flattened posture through the rebound thrust. At this instant, the front material that has detached from the slide plate continues to fly through the air with enormous inertia; while the rear material that remains on the slide plate is hindered by the change in angle due to the instantaneous upward and flattening of the slide plate. This motion vector misalignment caused by the transient geometric rebound of the slide plate exerts a secondary pull on the powder in its semi-detached state.

[0050] Accompanied by the high-frequency, reciprocating vibration of the independent slide plate 6 under alternating gravitational torque, the torn and pulverized fine dust particles become extremely thin in the depth direction. The originally disordered, heavy, and electrostatically agglomerated mixture exiting the feed pipe 2 is reshaped into a uniform, discrete, single-layer two-dimensional powder with independent particles and no depth optical obstruction before detaching from the tail of the final independent slide plate 6 and falling into the optical identification dark box of the color sorter. This exposes slight color deviations or associated impurities, reducing the missed and incorrect selection by the color sorting equipment.

[0051] After color sorting, the white material is then processed by a deep iron removal device to effectively remove weakly magnetic iron impurities, thus realizing the resource utilization of calcite solid waste through color sorting and iron removal.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A color sorting and iron removal device for the resource utilization of calcite solid waste, characterized in that, include: frame; The feeding pipe is located above the machine frame; The cascaded slide plate flow equalization assembly is inclinedly mounted on the frame and located below the feed pipe. It includes multiple partition plates arranged parallel to each other along the longitudinal direction, as well as multiple slide plate arrays. A feeding channel is formed between two adjacent partition plates, and each set of the sliding plate array is respectively arranged in the feeding channel; The slide array includes at least two independent slides arranged sequentially along the material flow direction. Each independent slide has an upper hinged end and a lower suspended end. The hinged end is rotatably mounted on the frame or partition plate, and an elastic support is connected between the bottom side of the suspended end and the frame. The two adjacent independent slide plates are arranged in a stepped manner, and the projection of the suspended end of the upper independent slide plate in the vertical direction along the material flow direction at least partially covers the hinge end of the lower independent slide plate. The projection of the end edge of the suspended end of the upper-level independent slide plate along the material flow direction in the vertical direction intersects or is adjacent to the hinge axis of the hinge end of the lower-level independent slide plate, so that the discharge point of the upper-level independent slide plate is located at the hinge axis position of the lower-level independent slide plate.

2. The color sorting and iron removal device for calcite solid waste resource utilization according to claim 1, characterized in that, The independent sliding plate has an inverted trapezoidal cross-section that is wider at the top and narrower at the bottom, so that the gap between the left and right side walls of the independent sliding plate and the side walls of the adjacent partition plate gradually increases from top to bottom.

3. The color sorting and iron removal device for calcite solid waste resource utilization according to claim 2, characterized in that, The thickness of the independent sliding plate gradually decreases from the hinged end to the suspended end.

4. The color sorting and iron removal device for calcite solid waste resource utilization according to claim 1, characterized in that, Between two adjacent independent skateboards, a flexible baffle skirt connects the bottom surface of the suspended end of the upper independent skateboard to the hinged end of the lower independent skateboard.

5. The color sorting and iron removal device for calcite solid waste resource utilization according to claim 1, characterized in that, The top edge of the partition plate is an upward-protruding acute-angled blade structure, and the height of the acute-angled blade structure is higher than the upper surface of the independent sliding plate.

6. The color sorting and iron removal device for calcite solid waste resource utilization according to claim 1, characterized in that, A flow guide channel is provided between the feed pipe and the cascaded slide plate flow equalization assembly. The width of the flow guide channel is equal to the total span formed by multiple partition plates. The longitudinal section of the flow guide channel is a J-shaped curved surface with variable curvature. The discharge tangent direction at the tail of the flow guide channel is parallel to the extension direction of the top independent slide plate of the slide plate array in its natural state.

7. The color sorting and iron removal device for calcite solid waste resource utilization according to claim 6, characterized in that, The tail discharge edge of the guide channel is provided with multiple slits, and the position of each slit corresponds to penetrating the partition plate.

8. The color sorting and iron removal device for calcite solid waste resource utilization according to claim 1, characterized in that, The elastic support is a helical spring, and a limiting structure is provided between the suspended end and the frame. The limiting structure limits the maximum downward tilt angle and the maximum upward tilt angle of the independent sliding plate around the hinge end.

9. The color sorting and iron removal device for calcite solid waste resource utilization according to claim 8, characterized in that, The helical spring is a non-linear variable pitch spring.

Images