A production line and process for comprehensive utilization of mine solid waste

Abstract

The present invention discloses a production line and process for comprehensive utilization of mine solid waste, which includes a primary screening device, a conveyor belt 1, an iron removal hopper, a crushing unit, a secondary screening device and a conveyor belt 2. The feed end of the primary screening device is a solid waste feeding end of a rough stone pile. The screened material of the primary screening device enters the iron removal hopper through the conveyor belt 1. The iron removal hopper is arranged above the feed port of the crushing unit. The iron removal hopper can remove magnetic metal foreign matter in the material. The crushing unit outputs the material to the secondary screening device. The crushed stone on the screen of the secondary screening device enters the conveyor belt 2. The end of the conveyor belt 2 is a magnetic roller 1. The magnetic roller 1 divides the crushed stone into recyclable magnetic ore separation crushed stone and stone aggregate for construction. The present invention adopts the design concept of screening before crushing, reduces the crushing workload, separately processes coarse materials and fine materials, and has good operation economy.

Description

Technical Field

[0001] The present invention relates to the technical field of mining solid waste recycling, and in particular to a mining solid waste comprehensive utilization production line and process thereof. Background Art

[0002] At present, waste rock and tailings are basically unusable solid wastes left after mining. Waste rock is mainly stripped rock layers, and tailings are low-grade ores in most cases in the form of fine materials. General mining areas often have tens of millions of tons of rough rock piles mainly composed of tailings and waste rock, which occupy a large amount of land and also cause pollution to the surrounding environment, and urgently need to be treated and resolved. Comprehensive treatment of these solid wastes, turning solid wastes into useful resources, and eliminating solid waste pollution to the environment will benefit the country and the people, and conform to the concept of innovative development and green development.

[0003] The particle size range of solid waste in rubble piles is relatively large, with large stones over 10 cm and fine sand particles under 1 mm, making them difficult to recycle. For rubble piles in nickel-iron mining areas, the existing recycling practice is often to crush them and then re-high-intensity magnetic separation to recover relatively high-grade iron-nickel ore, and the rest is processed into building materials and made into construction sand. However, the existing solid waste recycling production line is not designed for the actual situation of rubble piles. All raw materials are crushed first and then subjected to high-intensity magnetic separation. The crushing equipment has a large processing capacity and high operating costs. The poor economic efficiency affects the investment enthusiasm of the mining area. Moreover, metal parts such as wire mesh and anchor nails are often used in the greening project of rubble piles. If they are not removed and directly recycled, it will also cause damage to the crushing equipment.

[0004] Therefore, it is necessary to develop a comprehensive utilization production line of mine solid waste in view of the above-mentioned defects. Summary of the invention

[0005] The purpose of the present invention is to provide a comprehensive utilization production line of mining solid waste, which adopts the design concept of screening before crushing, reduces the crushing workload, processes coarse materials and fine materials separately, and has good operating economy.

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

[0007] The present invention discloses a production line for comprehensive utilization of mine solid waste, comprising a primary screening device, a conveyor belt, an iron removal hopper, a crushing unit, a secondary screening device and a conveyor belt. The feeding end of the primary screening device is a solid waste feeding end of a rough stone pile, and the screened material of the primary screening device enters the iron removal hopper through the conveyor belt. The iron removal hopper is arranged above the feeding port of the crushing unit, and the iron removal hopper can remove magnetic metal foreign matter in the material; the crushing unit outputs the material to the secondary screening device, and the crushed stone on the screen of the secondary screening device enters the conveyor belt. The end of the conveyor belt is a magnetic roller. The magnetic roller separates the crushed stone into recoverable magnetic ore separation crushed stone and stone aggregate for construction.

[0008] Furthermore, the primary screening device specifically adopts a first drop screen, which includes a frame, elastic legs, a casing and main screen slats. The casing is mounted on the frame through four elastic legs, and a plurality of main screen slats are arranged in parallel in the casing, and the long sides of the main screen slats are arranged along the direction in which the material slides.

[0009] Furthermore, the first drop screen also includes a vertical screen plate, which also adopts the form of a slat screen. The vertical screen plate is arranged perpendicular to the main screen slats and is located at the lower part of the casing close to the discharge.

[0010] Furthermore, the first blanking screen also includes an electromagnet and a torsion spring. The middle part of the vertical screen plate is rotatably mounted on the main screen plate strips and the casing through a rotating shaft. The two ends of the vertical screen plate are protruding out of the outside of the casing and are further provided with outer plates. The two ends of the vertical screen plate are provided with side connecting rods fixedly connecting the vertical screen plate strips; the casing is provided with an arc-shaped hole at the swinging position of the side connecting rod at the lower end; the electromagnet is fixed to the outer wall of the casing, and the electromagnet can absorb the inward folding plate of the outer plate so that the vertical screen plate is perpendicular to the main screen plate strips; the two torsion springs are sleeved on the two ends of the rotating shaft, and the two ends of the torsion springs are respectively fixed on the outer plate and the casing, and the torsion spring drives the vertical screen plate to return to a vertical state.

[0011] Furthermore, the second screen device specifically adopts a second drop screen, and the structure of the second drop screen is consistent with that of the first drop screen.

[0012] Furthermore, it also includes conveyor belt three, conveyor belt four and conveyor belt five, and conveyor belt three and conveyor belt four respectively convey the screened materials of the primary screening device and the secondary screening device to the feeding end of conveyor belt five; the discharging end of conveyor belt five adopts magnetic roller two, and magnetic roller two separates fine materials into recyclable magnetic fine materials and fine materials for construction.

[0013] Furthermore, it also includes a vibrating screen, the conveyor belt 5 outputs the fine materials for construction to the vibrating screen, and the output end of the vibrating screen outputs the sand materials for construction and the crushed stone aggregates respectively.

[0014] Furthermore, the iron removal hopper includes a hopper body, a flap, a flap driving unit and a sensor. The flap is flippably arranged at the side wall of the hopper body away from the conveyor belt 1 through a bottom shaft. The sensor is arranged on the frame of the conveyor belt 1 and is located close to one end of the discharging roller. When the sensor detects ferrous metal on the conveyor belt 1, it transmits a signal to the electronic control system of the equipment. The electronic control system controls the action of the flap driving unit to drive the flap to flip inward, and the ferrous metal debris on the conveyor belt 1 is output separately from the tail chute.

[0015] Furthermore, it also includes a feeder, which continuously outputs the rubble pile solid waste to the feeding end of the primary screening device.

[0016] The present invention provides a production process for comprehensive utilization of mining solid waste, which uses any of the above-mentioned production lines for comprehensive utilization of mining solid waste to process rough stone pile solid waste, and comprises the following steps:

[0017] S1, primary screening, using a slat screen to screen the rubble pile solid waste before crushing;

[0018] S2, iron removal, in the process of conveying the screened material in step S1, the iron metal in the rough stone pile solid waste is removed by using the iron removal hopper;

[0019] S3, crushing, crushing the rubble pile solid waste after iron removal;

[0020] S4, strong magnetic separation 1. The crushed materials in step S3 are first screened by the second screening device, and the crushed stones on the screen enter the strong magnetic separation process for magnetic separation to separate the recyclable magnetic separation crushed stones and building stone aggregates.

[0021] Compared with the prior art, the beneficial technical effects of the present invention are:

[0022] The mine solid waste comprehensive utilization production line of the present invention can remove fine materials such as sand and gravel in the solid waste by using the primary screening device for screening before crushing, so as to avoid entering the crushing unit for re-crushing, thereby reducing the processing capacity of the crushing unit; by arranging an iron removal hopper above the feed port of the crushing unit, it can avoid the iron metal mixed in the solid waste from entering the crushing unit. The iron metal with good toughness will damage the crusher, thereby increasing the service life of the equipment; by arranging a secondary screening device under the output port of the crushing unit, it can remove the fine materials mixed in the gravel again, so as to facilitate the direct output of the stone aggregate for construction with the same specifications after the magnetic separation in the later stage. The mine solid waste comprehensive utilization production line of the present invention adopts the design concept of screening before crushing, reduces the workload of crushing, separately processes the coarse materials and fine materials, and has good operation economy.

[0023] In addition, the slat screen is adopted by the primary screening device, which has a greater structural strength, can withstand the impact of materials, and has a long service life. The setting of the elastic legs can ensure that the screen plate and the screen body of the casing can move down a short distance and rebound when they are hit by falling materials. This reciprocating vibration can play a role in cleaning the screen plate to a certain extent. By adding a vertical screen plate and the vertical screen plate adopting a slat screen, it can not only block the falling materials, prolong the retention time of the materials on the screen, and improve the screening effect, but also increase the screening area while blocking and assisting the screening. By reasonably setting the position of the two side connecting rods on the vertical screen slats, the vertical screen slats can be completely overlapped when they are flat and the main screen slats, so that the retained materials can be fully discharged; by setting a rejection part on the material-facing surface of the vertical screen slats at the lower end, the triangular raised rejection part can increase the contact pressure with the blocked materials and effectively remove the materials blocked between the screen gaps of the main screen slats. At the same time, the rejection part protrudes from the main screen plate strips in the overlapping state, and blockage occurs in time. Under the impact of the rubble pile solid waste materials, the torsion spring can assist the vertical screen plate to reset to a vertical state. By adding electromagnets and torsion springs on the periphery of the vertical screen plate, it is equivalent to adding an automatic unloading and automatic reset function to the vertical screen plate. During the unloading and reset process, the weight of the entire screen body is reduced, and it will rebound upward with a larger displacement as a whole under the reset force of the elastic legs, completing a larger vibration. This larger amplitude periodic vibration can effectively remove the jammed gravel, clean the screen plate, promote screening, and improve the screening effect. It is important that compared with the commonly used vibrating screen, the blanking screen in the present invention does not require an additional vibration source. It adopts two variable amplitude vibration modes of blanking impact vibration and vertical screen plate unloading reset vibration, which can be comparable to the working effect of the vibrating screen and save energy and equipment investment costs. By adding conveyor belts three, four and five, the fine material under the screen can be further processed separately, and the recyclable magnetic fine material can be magnetically selected for smelting and recovery. By adding a vibrating screen, fine materials for construction can be further divided into sand and crushed stone aggregate for construction, which can be used in different construction applications. The entire production line has achieved full utilization of solid waste and truly achieved zero emissions. Through the setting of the flap, the ferrous metal debris in the material can be intercepted at any time and removed separately to prevent the debris from entering the crushing unit and causing damage to the crushing equipment.

[0024] The comprehensive utilization production process of mine solid waste of the present invention can re-magnetically select relatively high-grade magnetic ore and fine materials, and recycle and smelt to improve economic benefits. At the same time, it outputs three kinds of building materials of particle size, including stone aggregate, crushed stone aggregate and sand material for construction, with low process cost and wide applicability, and completely utilizes solid waste to truly achieve zero emission. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1This is a schematic diagram of the layout structure of the mine solid waste comprehensive utilization production line of the present invention;

[0027] Figure 2 It is a schematic diagram of the main structure of the first blanking screen of the present invention;

[0028] Figure 3 for Figure 2 Schematic diagram of the structure viewed from the direction A of the neutral sieve plate;

[0029] Figure 4 This is a schematic diagram of the state in which the vertical screen slats of the present invention are perpendicular to the main screen slats;

[0030] Figure 5 It is a schematic diagram of the state in which the vertical screen slats of the present invention overlap the main screen slats;

[0031] Figure 6 This is the production process roadmap for comprehensive utilization of mining solid waste of the present invention.

[0032] Explanation of the reference numerals in the accompanying drawings: 1. first drop screen; 101. frame; 102. elastic legs; 103. casing; 1031. arc-shaped holes; 104. main screen strips; 105. vertical screen plates; 1051. rotating shaft; 1052. side connecting rods; 1053. outer plates; 1054. vertical screen strips; 1055. rejecting part; 106. electromagnet; 107. torsion spring; 2. conveyor belt one; 3. iron removal hopper; 301. flap; 302. sensor; 4. crushing unit; 5. second drop screen; 6. conveyor belt two; 601. magnetic roller one; 7. conveyor belt three; 8. conveyor belt four; 9. conveyor belt five; 901. magnetic roller two; 10. vibrating screen; 11. feeder. DETAILED DESCRIPTION

[0033] The core of the present invention is to provide a production line and process for comprehensive utilization of mining solid waste, which adopts the design concept of screening before crushing, reduces the crushing workload, processes coarse materials and fine materials separately, and has good operating economy.

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0036] With reference to the accompanying drawings, Figure 1 This is a schematic diagram of the layout structure of the mine solid waste comprehensive utilization production line of the present invention; Figure 2 It is a schematic diagram of the main structure of the first blanking screen of the present invention; Figure 3 for Figure 2 Schematic diagram of the structure viewed from the direction A of the neutral sieve plate; Figure 4 This is a schematic diagram of the state in which the vertical screen slats of the present invention are perpendicular to the main screen slats; Figure 5 It is a schematic diagram of the state in which the vertical screen slats of the present invention overlap the main screen slats; Figure 6 This is the production process roadmap for comprehensive utilization of mining solid waste of the present invention.

[0037] In a specific embodiment, Figure 1 As shown, a production line for comprehensive utilization of mining solid waste includes a primary screening device, a conveyor belt 2, an iron removal hopper 3, a crushing unit 4, a secondary screening device and a conveyor belt 6. The feed end of the primary screening device is the solid waste feeding end of the rough stone pile. The screened material of the primary screening device enters the iron removal hopper 3 through the conveyor belt 2. The iron removal hopper 3 is arranged above the feed port of the crushing unit 4. The iron removal hopper 3 can remove magnetic metal foreign matter in the material. The crushing unit 4 outputs the material to the secondary screening device, and the crushed stone on the screen of the secondary screening device enters the conveyor belt 6. The end of the conveyor belt 6 is a magnetic roller 601, which is also a magnetic pulley. The magnetic force is provided by a high-strength permanent magnet, and the magnetic field strength is 3500-4000GS. A separation box is arranged below the magnetic roller 601 to separate the crushed stone into recyclable magnetic separation crushed stone and stone aggregate for construction.

[0038] Specifically, if Figure 1 As shown, the crushing unit 4 can be any one of a cone crusher, a jaw crusher and a roller crusher, or a combined crushing station of two or more thereof.

[0039] By using the primary screening device for screening before crushing, fine materials such as sand particles and crushed stone chips in the solid waste can be removed to avoid entering the crushing unit 4 for re-crushing, thereby reducing the processing capacity of the crushing unit 4; by arranging the iron removal hopper 3 above the feed port of the crushing unit 4, it is possible to prevent the iron metal mixed in the solid waste from entering the crushing unit 4. The iron metal with good toughness will damage the crusher, thereby increasing the service life of the equipment; by arranging the secondary screening device under the output port of the crushing unit 4, the fine materials mixed in the crushed stone can be removed again, so as to facilitate the direct output of the same specifications of the building stone aggregate after the magnetic separation in the later stage. The comprehensive utilization production line of mining solid waste of the present invention adopts the design concept of screening before crushing, reduces the workload of crushing, separately processes the coarse materials and fine materials, and has good operation economy.

[0040] In a specific embodiment of the present invention, Figures 1 to 5 As shown, the primary screening device specifically adopts the first blanking screen 1, and the first blanking screen 1 includes a frame 101, elastic legs 102, a casing 103 and main screen slats 104. The casing 103 is mounted on the frame 101 through four elastic legs 102. The elastic legs 102 can be air spring legs, or they can be legs in the form of spiral springs and sleeves. The elastic legs 102 can play a role in vibration isolation. A plurality of main screen slats 104 are arranged in parallel in the casing 103, and the long sides of the main screen slats 104 are arranged along the direction in which the material slides. The casing 103 is rectangular on the front of the screen plate, and the upper and two side parts are higher than the screen plate surface to prevent material overflow.

[0041] The primary screening device adopts a slat screen, which has a large structural strength, can withstand the impact of materials, and has a long service life. The setting of the elastic legs 102 can ensure that the screen plate and the screen body part of the housing 103 can move down a short distance and rebound when subjected to the impact of falling materials. This reciprocating vibration can play a role in cleaning the screen plate to a certain extent.

[0042] Specifically, if Figures 1 to 5 As shown, the first blanking screen 1 further includes a vertical screen plate 105, which is also in the form of a slat screen. The vertical screen plate 105 is arranged perpendicular to the main screen slats 104 and is located at the lower part of the casing 103 close to the discharge.

[0043] By adding the vertical screen plate 105, and the vertical screen plate 105 adopting the slat screen form, it can not only block the falling materials, prolong the retention time of the materials on the screen, and improve the screening effect, but also increase the screening area while blocking, and play a role of assisting screening.

[0044] Specifically, if Figures 1 to 5As shown, the first blanking screen 1 also includes an electromagnet 106 and a torsion spring 107. The middle part of the vertical screen plate 105 is rotatably mounted on the main screen plate strip 104 and the housing 103 through a rotating shaft 1051. The rotating shaft 1051 is arranged along the width direction of the screen plate. The main screen plate strip 104 and the housing 103 are both provided with through holes for penetrating the rotating shaft 1051, and can rotate relative to each other. That is, the main screen plate strip 104 and the vertical screen plate 105 are arranged in a cross-spaced manner. The left and right ends of the vertical screen plate 105 protrude out of the outside of the housing 103 and are fixedly connected to the outer side plate 1053. The upper and lower ends of the vertical screen plate 105 are respectively provided with side connecting rods 1052 fixedly connected to each vertical screen plate strip, and the side connecting rods 1052 are arranged parallel to the rotating shaft 1051. The side connecting rod 1052 at the upper end is located on the material-facing surface of the vertical screen strip 1054, and the side connecting rod 1052 at the lower end is located on the material-receiving surface of the vertical screen strip 1054. The side connecting rod 1052 at the lower end is fixedly connected to each vertical screen strip 1054 and the outer plate 1053 by welding; the side connecting rod 1052 at the upper end is fixedly connected to each vertical screen strip 1054 by welding. Each vertical screen strip 1054 and the outer plate 1053 are respectively fixedly connected to the rotating shaft 1051 by welding. The casing 103 is provided with an arc hole 1031 at the swinging position of the side connecting rod 1052 at the lower end. That is, the side connecting rod 1052 can swing in the arc hole 1031, and the central angle of the arc hole 1031 is 85 degrees. The electromagnet 106 is fixed to the outer wall of the housing 103 by bolts. The electromagnet 106 can absorb the folding plate facing inward at the bottom of the outer plate 1053. When adsorbed, the vertical screen plate 105 is perpendicular to the main screen plate bar 104. Two torsion springs 107 are sleeved at both ends of the rotating shaft 1051. The two ends of the torsion springs 107 are respectively fixed to the outer plate 1053 and the housing 103. The torsion springs 107 drive the vertical screen plate 105 to return to a vertical state.

[0045] Specifically, if Figure 4 and Figure 5 As shown, the vertical screen plate 1054 is provided with a rejection portion 1055 on the material-facing surface at the lower end. The rejection portion 1055 is in the shape of a triangular protrusion. When the vertical screen plate 105 is laid flat, the rejection portion 1055 can effectively reject the materials blocked between the screen gaps of the main screen plate slats 104 above the rotating shaft 1051.

[0046] By properly setting the positions of the two side connecting rods 1052 on the vertical screen strips 1054, the vertical screen strips 1054 can be completely overlapped with the main screen strips 104 when they are laid flat, so that the retained materials can be fully discharged; by setting the rejection part 1055 on the material-facing surface at the lower end of the vertical screen strips 1054, the triangular protruding rejection part 1055 can increase the contact pressure with the blocked materials, and effectively remove the materials blocked between the screen gaps of the main screen strips 104. At the same time, in the overlapping state, the rejection part 1055 protrudes from the main screen strips 104, and the blockage occurs in time, and the torsion spring 107 can be assisted to reset the vertical screen plate 105 to a vertical state under the impact of the rubble pile solid waste materials.

[0047] Specifically, the electromagnet 106 has two working modes to choose from. One is that the electromagnet 106 is always in the power-on state and has adsorption force. When the stones carried by the vertical sieve plate 105 gradually increase to overcome the adsorption force of the electromagnet 106, the outer plate 1053 folding plate detaches from the electromagnet 106, the vertical sieve plate 105 rotates clockwise, and the angle with the sieve plate decreases. The stones carried by the vertical sieve plate 105 are unloaded. Under the reset force of the torsion spring 107, the vertical sieve plate 105 returns to the vertical state, and the outer plate 1053 folding plate is adsorbed by the electromagnet 106 again. The other working mode is to realize the normal blocking and unloading of the vertical sieve plate 105 by powering on and off the electromagnet 106, which requires the electric control system to install a set time interval to control the operation of the electromagnet 106.

[0048] By adding electromagnets 106 and torsion springs 107 to the periphery of the vertical screen plate 105, it is equivalent to adding an automatic unloading and automatic resetting function to the vertical screen plate 105. During the unloading and resetting process, the weight of the entire screen body is reduced, and it will rebound upward with a larger displacement under the resetting force of the elastic legs 102, completing a larger vibration. This larger amplitude periodic vibration can effectively remove stuck gravel, clean the screen plate, promote screening, and improve the screening effect. It is important that compared with the commonly used vibrating screen, the blanking screen in the present invention does not require an additional vibration source, and adopts two variable amplitude vibration modes of blanking impact vibration and vertical screen plate 105 unloading and resetting vibration, which can be comparable to the working effect of the vibrating screen and save energy and equipment investment costs.

[0049] In a specific embodiment of the present invention, Figure 1 As shown, the second screening device specifically adopts a second drop screen 5, and the structure of the second drop screen 5 is consistent with the first drop screen 1. Both drop screens are independently developed by the applicant and have achieved good screening effects.

[0050] In a specific embodiment of the present invention, Figure 1 As shown, the comprehensive utilization production line of mining solid waste of the present invention also includes a conveyor belt 3 7, a conveyor belt 4 8 and a conveyor belt 5 9. The conveyor belt 3 7 and the conveyor belt 4 8 respectively convey the screened materials of the first drop screen 1 and the second drop screen 5 to the feeding end of the conveyor belt 5 9. The discharge end of the conveyor belt 5 9 adopts a magnetic roller 2 901, which is a magnetic pulley and adopts a high-strength permanent magnet to provide magnetic force. The magnetic field strength is 3500-4000GS. The magnetic roller 2 901 divides the fine material into recyclable magnetic fine material and construction fine material.

[0051] Specifically, if Figure 1 As shown, the mining solid waste comprehensive utilization production line of the present invention also includes a vibrating screen 10, and the conveyor belt 59 outputs the fine materials for construction to the feed port of the vibrating screen 10 through the material guide trough, and the output end of the vibrating screen 10 outputs the sand materials and crushed stone aggregates for construction respectively.

[0052] By adding conveyor belt 3 7, conveyor belt 4 8 and conveyor belt 5 9, the fine material under the screen can be further processed separately, and the recyclable magnetic fine material can be magnetically selected for smelting and recycling. By adding vibrating screen 10, the fine material for construction can be further divided into sand material for construction and crushed stone aggregate for application in different construction applications. The entire production line has achieved full utilization of solid waste and truly achieved zero emission.

[0053] In a specific embodiment of the present invention, Figure 1 As shown, the iron removal hopper 3 includes a hopper body, a flap 301, a flap drive unit and a sensor 302. The flap 301 is flippably arranged at the side wall of the hopper body away from the conveyor belt 2 through the bottom shaft, and the sensor 302 is arranged on the frame of the conveyor belt 2 and is located near one end of the discharge roller. The sensor 302 uses the change signal generated when the ferrous metal enters the electromagnetic field of the sensor, processes it through electronic technology and feeds it back to the controller. The sensor 302 is a purchased part, and there are many products on sale in the market, which will not be elaborated here. When the sensor 302 detects that there is ferrous metal on the conveyor belt 2, it transmits a signal to the electronic control system of the equipment, and the electronic control system controls the action of the flap drive unit to drive the flap 301 to flip inward, and the top of the flap 301 is overlapped on the other side wall, intercepting the ferrous metal debris on the conveyor belt 2, and outputting it separately from the chute at the tail to the collection box below. The flap driving unit may be a cylinder push rod structure or a reduction motor may be used to output torque to the bottom shaft of the flap 301 .

[0054] During the long-term storage of the rubble pile, in order to improve the environment of the mining area, the rubble pile is often regreened, that is, green plants are planted. During this process, wire mesh will be laid and fixed with anchors. When the rubble pile is reused, it is inevitable that the raw materials of the rubble pile are mixed with metal debris, such as rusted mesh, anchors and even iron garbage in daily life. It is impossible to completely remove it before the forklift loads the feeder 11, so it is necessary to remove iron before crushing.

[0055] By setting the flap 301, the ferrous metal debris in the material can be intercepted at any time and removed separately, thereby preventing the debris from entering the crushing unit 4 and causing damage to the crushing equipment.

[0056] In a specific embodiment of the present invention, the mine solid waste comprehensive utilization production line of the present invention further includes a feeder 11, which continuously outputs the rubble pile solid waste to the feed end of the primary screening device. The feeder 11 can adopt a screw conveying method or a push method.

[0057] By adding a feeder 11 at the feeding end of the first drop screen 1, it is possible to ensure a continuous and stable output flow of materials to the first drop screen 1, avoid the instability of direct material feeding by a forklift, increase the service life of the first drop screen 1, and improve the screening quality.

[0058] In summary, the mine solid waste comprehensive utilization production line of the present invention can remove fine materials such as sand and gravel in the solid waste by using the primary screening device for screening before crushing, so as to avoid entering the crushing unit 4 for re-crushing, thereby reducing the processing capacity of the crushing unit 4; by arranging the iron removal hopper 3 above the feed port of the crushing unit 4, it can prevent the iron metal mixed in the solid waste from entering the crushing unit 4, and the iron metal with good toughness will cause damage to the crusher, thereby improving the service life of the equipment; by arranging the second screening device to be connected below the output port of the crushing unit 4, the fine materials mixed in the gravel can be removed again, so as to facilitate the direct output of the same specifications of the building stone aggregate after the magnetic separation in the later stage. The mine solid waste comprehensive utilization production line of the present invention adopts the design concept of screening before crushing, reduces the workload of crushing, separately processes the coarse materials and fine materials, and has good operation economy. In addition, the slat screen is adopted by the primary screening device, which has a large structural strength, can withstand the impact of materials, and has a long service life. The setting of the elastic legs 102 can ensure that the screen plate and the screen body part of the housing 103 can move down a short distance and rebound when subjected to the impact of falling materials. This reciprocating vibration can play a role in cleaning the screen plate to a certain extent. By adding a vertical screen plate 105, and the vertical screen plate 105 adopts a slat screen form, it can not only block the falling materials, prolong the retention time of the materials on the screen, and improve the screening effect, but also increase the screening area while blocking and assisting the screening. By reasonably setting the position of the two side connecting rods 1052 on the vertical screen strips 1054, the vertical screen strips 1054 can be completely overlapped with the main screen strips 104 when they are laid flat, so that the retained materials can be fully discharged; by setting a rejection part 1055 on the material-facing surface at the lower end of the vertical screen strips 1054, the triangular protruding rejection part 1055 can increase the contact pressure with the blocked materials, and effectively remove the materials blocked between the screen seams of the main screen strips 104. At the same time, in the overlapping state, the rejection part 1055 protrudes from the main screen plate 104, and blockage occurs in time. Under the impact of the rubble pile solid waste materials, the torsion spring 107 can be assisted to reset the vertical screen plate 105 to a vertical state. By adding electromagnets 106 and torsion springs 107 to the periphery of the vertical screen plate 105, it is equivalent to adding an automatic unloading and automatic reset function to the vertical screen plate 105. During the unloading and reset process, the weight of the entire screen body is reduced, and it will rebound upward with a larger displacement under the reset force of the elastic legs 102, completing a larger vibration. This larger amplitude periodic vibration can effectively remove the stuck gravel, clean the screen plate, promote screening, and improve the screening effect. It is important that compared with the commonly used vibrating screen, the blanking screen in the present invention does not require an additional vibration source, and adopts two variable amplitude vibration modes of blanking impact vibration and vertical screen plate 105 unloading reset vibration, which can be comparable to the working effect of the vibrating screen and save energy and equipment investment costs. By adding conveyor belt three 7, conveyor belt four 8 and conveyor belt five 9, the fine material under the screen can be further processed separately, and the recyclable magnetic fine material can be magnetically selected for smelting and recovery.By adding a vibrating screen 10, fine materials for construction can be further divided into sand materials for construction and crushed stone aggregates for use in different construction applications. The entire production line achieves full utilization of solid waste and truly achieves zero emissions. By setting the flap 301, it can be activated at any time to intercept ferrous metal debris in the material and remove it separately to prevent the debris from entering the crushing unit 4 and causing damage to the crushing equipment.

[0059] The present invention also discloses a production process for comprehensive utilization of mine solid waste, such as Figure 4 As shown, the comprehensive utilization production line for mining solid waste described in the above embodiment is used to process and comprehensively utilize the rough stone pile solid waste, including the following steps:

[0060] S1, initial screening, using a slat screen to screen the rubble pile solid waste before crushing, the feeder 11 outputs the rubble pile solid waste material to the feed end of the first blanking screen 1. When the material rolls down on the screen plate of the main screen strips 104, the fine material falls under the screen along the screen gap, and the vertical screen plate 105 can block the material flow and extend the retention time on the screen; when the electromagnet 106 is powered off, the vertical screen plate 105 is flipped around the rotating shaft 1051 under the gravity of the material it carries, and the stone carried by the vertical screen plate 105 is unloaded. Under the reset force of the torsion spring 107, the vertical screen plate 105 returns to a vertical state and is adsorbed by the energized electromagnet 106 again. The two types of variable amplitude vibrations, the falling material impact vibration and the vertical screen plate 105 unloading reset vibration, can effectively clean the screen plate and improve the screening effect. The particle size of the material on the screen is greater than 5 mm. During the screening process, large stones are cleaned and the fine debris adhering to the surrounding areas falls under the screen, and fine materials less than 5 mm enter under the screen.

[0061] S2, iron removal, in the process of conveying the screened material in step S1, the iron removal hopper is used to remove the iron metal in the rubble pile solid waste. When the sensor 302 detects that there is iron metal on the conveyor belt 2, it transmits a signal to the electronic control system of the equipment, and the electronic control system controls the flap drive unit to drive the flap 301 to flip inward, and the top of the flap 301 overlaps the other side wall, intercepts the iron metal on the conveyor belt 2, and outputs it separately from the tail chute to the collection box below.

[0062] S3, crushing, crushing the rubble stone pile solid waste after iron removal. The crushing unit 4 crushes the stone material, and the particle size after crushing is not more than 12 mm.

[0063] S4, strong magnetic separation 1. The material crushed in step S3 is first screened by the second screen device, and the crushed stone on the screen enters the strong magnetic separation process for magnetic separation to separate the recyclable magnetic separation crushed stone and the stone aggregate for construction. The second drop screen 5 performs reduction screening on the crushing unit 4. The crushing unit 4 will inevitably produce fine materials less than 5 mm during the crushing process. The second drop screen 5 has the same working principle as the first drop screen 1, which will not be repeated here. The fine materials less than 5 mm enter the screen, and the stones of 5 to 12 mm enter the conveyor belt 2 6, which are magnetically separated by the magnetic roller 1 601 to separate the crushed stone into recyclable magnetic separation crushed stone and stone aggregate for construction.

[0064] In a specific embodiment of the comprehensive utilization production process of mining solid waste of the present invention, as Figure 4 As shown, it also includes a fine material recovery process: the conveyor belt 3 7 and the conveyor belt 4 8 convey the screened materials of the first drop screen 1 and the second drop screen 5 to the feeding end of the conveyor belt 5 9, and the magnetic roller 2 901 at the discharge end of the conveyor belt 5 9 performs a strong magnetic separation process on the fine materials to distinguish and output them as recyclable magnetic fine materials and building fine materials. Further, the conveyor belt 5 9 outputs the building fine materials to the feed port of the vibrating screen 10 through the guide trough, and the output end of the vibrating screen 10 outputs the building sand and crushed stone aggregate respectively. The particle size of the building sand is controlled to be less than 2 mm, and the particle size range of the crushed stone aggregate is 2 to 5 mm.

[0065] The comprehensive utilization production process of mine solid waste of the present invention can re-magnetically select relatively high-grade magnetic ore and fine materials, and recycle and smelt to improve economic benefits. At the same time, it outputs three kinds of building materials of particle size, including stone aggregate, crushed stone aggregate and sand material for construction, with low process cost and wide applicability, and completely utilizes solid waste to truly achieve zero emission.

[0066] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0067] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A production line for comprehensive utilization of mining solid waste, characterized in that: The invention comprises a primary screening device, a conveyor belt (2), an iron removal hopper (3), a crushing unit (4), a secondary screening device and a conveyor belt (6), wherein the feed end of the primary screening device is a solid waste feeding end of a rough stone pile, the screened material of the primary screening device enters the iron removal hopper (3) through the conveyor belt (2), the iron removal hopper (3) is arranged above the feed opening of the crushing unit (4), and the iron removal hopper (3) can remove magnetic metal foreign matter in the material; the crushing unit (4) outputs the material to the secondary screening device, the screened crushed stone of the secondary screening device enters the conveyor belt (6), and the end of the conveyor belt (6) is a magnetic roller (601), and the magnetic roller (601) separates the crushed stone into recyclable magnetic separation crushed stone and stone aggregate for construction; The primary screening device specifically adopts a first drop screen (1), the first drop screen (1) comprising a frame (101), elastic legs (102), a casing (103) and main screen strips (104), the casing (103) being mounted on the frame (101) via four elastic legs (102), a plurality of main screen strips (104) being arranged in parallel in the casing (103), and the long sides of the main screen strips (104) being arranged along the direction in which the material slides down; The first drop screen (1) further comprises a vertical screen plate (105), the vertical screen plate (105) also adopts a slat screen form, the vertical screen plate (105) is arranged perpendicular to the main screen slats (104) and is located at the lower part of the casing (103) close to the discharge; The first blanking screen (1) further comprises an electromagnet (106) and a torsion spring (107); the middle portion of the vertical screen plate (105) is rotatably mounted on the main screen strip (104) and the housing (103) via a rotating shaft (1051); outer plates (1053) are arranged at both ends of the vertical screen plate (105) protruding out of the outer side of the housing (103); side connecting rods (1052) are respectively arranged at the upper and lower ends of the vertical screen plate (105) to be fixedly connected to each of the vertical screen strips (1054); the upper end of the side connecting rod (1052) is located on the material-facing surface of the vertical screen strip (1054); and the lower end of the side connecting rod (1052) is located on the inner side of the vertical screen strip (1054). On the back material surface; the casing (103) is provided with an arc hole (1031) at the swinging position of the side connecting rod (1052) at the lower end; the electromagnet (106) is fixed on the outer wall of the casing (103), and the electromagnet (106) can adsorb the inward folding plate of the outer plate (1053) so that the vertical screen plate (105) is perpendicular to the main screen plate bar (104); the two torsion springs (107) are inserted into the two ends of the rotating shaft (1051), and the two ends of the torsion spring (107) are respectively fixed on the outer plate (1053) and the casing (103), and the torsion spring (107) drives the vertical screen plate (105) to return to a vertical state.

2. The comprehensive utilization production line of mining solid waste according to claim 1 is characterized by: The second screen device specifically adopts a second drop screen (5), and the structure of the second drop screen (5) is consistent with that of the first drop screen (1).

3. The comprehensive utilization production line of mining solid waste according to claim 1 is characterized by: It also includes a conveyor belt three (7), a conveyor belt four (8) and a conveyor belt five (9), wherein the conveyor belt three (7) and the conveyor belt four (8) respectively convey the screened materials of the primary screening device and the secondary screening device to the feeding end of the conveyor belt five (9); the discharge end of the conveyor belt five (9) adopts a magnetic roller two (901), and the magnetic roller two (901) separates the fine materials into recyclable magnetic fine materials and building fine materials.

4. The comprehensive utilization production line of mining solid waste according to claim 3 is characterized by: It also comprises a vibrating screen (10), the conveyor belt five (9) outputs fine materials for construction to the vibrating screen (10), and the output end of the vibrating screen (10) outputs sand materials and crushed stone aggregates for construction respectively.

5. The comprehensive utilization production line of mining solid waste according to claim 1 is characterized by: The iron removal hopper (3) comprises a hopper body, a flap (301), a flap driving unit and a sensor (302); the flap (301) is flippably arranged on a side wall of the hopper body away from the conveyor belt (2) through a bottom shaft; the sensor (302) is arranged on a frame of the conveyor belt (2) and is located near one end of a discharge roller; when the sensor (302) detects that there is ferrous metal on the conveyor belt (2), it transmits a signal to the electronic control system of the device; the electronic control system controls the action of the flap driving unit to drive the flap (301) to flip inward, so that the ferrous metal debris on the conveyor belt (2) is discharged separately from the tail chute.

6. The comprehensive utilization production line of mining solid waste according to claim 1 is characterized by: It also includes a feeder (11), which continuously outputs the rubble pile solid waste to the feed end of the primary screening device.

7. A production process for comprehensive utilization of mining solid waste, characterized in that: Processing the rough stone pile solid waste by using the comprehensive utilization production line of mining solid waste according to any one of claims 1 to 6 comprises the following steps: S1. Preliminary screening: Use slat screen to screen the rubble pile solid waste before crushing; two types of variable amplitude vibration, namely, falling material impact vibration and vertical screen plate unloading reset vibration, can effectively clean the screen plate and improve the screening effect; S2, iron removal, in the process of conveying the screened material in step S1, the iron metal in the rough stone pile solid waste is removed by using the iron removal hopper; S3, crushing, crushing the rubble pile solid waste after iron removal; S4, strong magnetic separation 1. The crushed materials in step S3 are first screened by the second screening device, and the crushed stones on the screen enter the strong magnetic separation process for magnetic separation to separate the recyclable magnetic separation crushed stones and building stone aggregates.

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