Crushing and recleaning process system for lump coal products in dense medium coal preparation plant

Abstract

The utility model relates to the technical field of coal washing, in particular to a lump coal product crushing and recleaning process system for a dense medium coal preparation plant, which comprises a desliming screen, a three-product dense medium cyclone, a clean coal arc-shaped screen, a middling coal arc-shaped screen, a gangue arc-shaped screen, a clean coal linear vibrating screen, a middling coal linear vibrating screen and a gangue linear vibrating screen. An oversize outlet of the desliming screen is connected with an inlet of a three-product dense medium cyclone, and a clean coal outlet, a middling coal outlet and a gangue outlet of the three-product dense medium cyclone are connected with a clean coal sieve bend, a middling coal sieve bend and a gangue sieve bend respectively; the clean coal arc-shaped screen, the middling coal arc-shaped screen and the gangue arc-shaped screen are connected with the clean coal linear vibrating screen, the middling coal linear vibrating screen and the gangue linear vibrating screen respectively, a block clean coal outlet and a block middling coal outlet on the clean coal linear vibrating screen and the middling coal linear vibrating screen are connected with the crusher respectively, and the crusher is connected with the desliming screen through a mixing barrel and a mixing pump. Considerable economic benefits are created, and resource utilization maximization is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal washing, in particular to a heavy medium coal preparation plant lump coal product crushing and re-selection process system. Background Art

[0002] As we all know, the coal industry is the energy foundation for my country's rapid economic development and occupies an absolute position in my country's energy consumption.

[0003] With the extension of mining time and the increase of mining depth, high-quality coal materials are becoming increasingly scarce. With the complexity of raw coal properties, the selectivity of raw coal is gradually deteriorating. The original sorting process of some coking coal preparation plants can no longer meet the requirements of washing indicators. Many sites have problems of lumps of clean coal mixed with gangue and medium coal containing fine coal. In order to improve the comprehensive recovery rate of precious coking coal resources, it is of great significance to crush and re-select the lumps of coal in response to the actual problems that arise on site. Summary of the invention

[0004] The purpose of the utility model is to solve the deficiencies of the above-mentioned prior art and provide a method for solving the problem of ash fluctuation in clean coal and high calorific value of medium coal caused by the inability to fully dissociate raw coal, effectively improve the sorting density of the main washing system, greatly improve the comprehensive clean coal yield, create considerable economic benefits, and realize the heavy medium coal preparation plant lump coal product crushing and re-selection process system with maximum resource utilization.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A heavy medium coal preparation plant lump coal product crushing and reselection process system, characterized by comprising a desludging screen, a three-product heavy medium cyclone, a clean coal curved screen, a medium coal curved screen, a gangue curved screen, a clean coal linear vibrating screen, a medium coal linear vibrating screen, and a gangue linear vibrating screen, wherein the desludging screen has an outlet on the screen connected to the inlet of the three-product heavy medium cyclone, the clean coal outlet, the medium coal outlet, and the gangue outlet of the three-product heavy medium cyclone are respectively connected to the clean coal curved screen, the medium coal curved screen, and the gangue curved screen, the clean coal curved screen, the medium coal curved screen, and the gangue curved screen are respectively connected to the clean coal linear vibrating screen, the medium coal linear vibrating screen, and the gangue linear vibrating screen, the lump clean coal outlet and the lump medium coal outlet on the clean coal linear vibrating screen and the medium coal linear vibrating screen are respectively connected to the inlet of a crusher, and the outlet of the crusher is connected to the inlet of the desludging screen via a mixing barrel and a mixing pump.

[0007] The utility model discloses a desludging screen whose under-screen outlet is connected to the inlet of a hydraulic classification cyclone, whose underflow outlet is connected to an interference bed separator, whose interference bed separator is connected to a first curved screen, whose coarse coal slime outlet on the screen of the first curved screen is connected to the inlet of a coarse coal centrifuge, whose clean coal outlet of the coarse coal centrifuge is connected to a clean coal bin via a belt, whose centrifugal liquid outlet is connected to a flotation machine, whose under-screen outlet of the first curved screen is connected to the inlet of a flotation machine, whose concentrate outlet is connected to a horizontal sedimentation filtration type centrifugal dehydrator via a second curved screen, whose horizontal sedimentation filtration type centrifuge is connected to a horizontal sedimentation filtration type centrifugal dehydrator. The fine-grained clean coal slime outlet of the centrifugal dewatering machine is connected to the clean coal bin through a belt, the centrifugal liquid outlet of the horizontal sedimentation filtration centrifugal dewatering machine and the tailings outlet of the flotation machine are respectively connected to the rake thickener, the overflow outlet of the rake thickener is connected to the circulating water pool, the circulating water pool is respectively connected to the water replenishment ports of the clean coal linear vibrating screen, the medium coal linear vibrating screen and the gangue linear vibrating screen through a circulating pump, the underflow port of the rake thickener is connected to the filter press, the filter cake outlet of the filter press is tailings slime, the filtrate outlet of the filter press is connected to the inlet of the circulating water pool, and the overflow port of the hydraulic grading cyclone is connected to the inlet of the flotation machine.

[0008] The fine clean coal outlet under the screen of the clean coal linear vibrating screen described in the utility model is connected to the clean coal centrifuge, the clean coal outlet of the clean coal centrifuge is connected to the clean coal bin via a belt, the liquid outlet of the clean coal centrifuge is connected to the inlet of the mixing barrel, the product of the fine medium coal outlet under the screen of the medium coal linear vibrating screen is the medium coal product, and the qualified medium outlet of the gangue linear vibrating screen is connected to the inlet of the supplementary medium cylinder.

[0009] The utility model discloses a clean coal linear vibrating screen with a dilute medium outlet under the screen connected to an inlet of a clean coal magnetic separator, a concentrate outlet of the clean coal magnetic separator is connected to a supplementary medium cylinder, the supplementary medium cylinder is connected to a water distribution pipe of a three-product heavy medium cyclone via a medium pump, a tailings outlet of the clean coal magnetic separator is connected to an inlet of a mixing barrel, a medium coal linear vibrating screen with a dilute medium outlet under the screen connected to a medium coal magnetic separator, a concentrate outlet of the medium coal magnetic separator is connected to a supplementary medium cylinder, a tailings outlet of the medium coal magnetic separator is connected to a concentrating cyclone, an underflow outlet of the concentrating cyclone is connected to a first vibrating screen, a product of an outlet above the screen of the first vibrating screen is medium coal slime, a screen outlet of the first vibrating screen is connected to an inlet of a flotation machine, and a screen outlet of the gangue curved screen is connected to an inlet of the supplementary medium cylinder.

[0010] The screen product outlet of the gangue linear vibrating screen of the utility model is a gangue product, and the dilute medium outlet of the gangue linear vibrating screen is connected with the inlet of the medium coal magnetic separator.

[0011] The under-screen outlet of the clean coal curved screen and the under-screen qualified medium outlet of the clean coal linear vibrating screen described in the utility model are respectively connected to the inlet of the clean coal magnetic separator and the inlet of the supplementary medium cylinder through a diverter, and the under-screen outlet of the medium coal curved screen and the under-screen qualified medium outlet of the medium coal linear vibrating screen are connected to the inlet of the supplementary medium cylinder.

[0012] The crushing particle size of the crusher described in the utility model is -3mm, -6mm or -13mm.

[0013] The sieve plate filtering particle size of the clean coal linear vibrating screen and the medium coal linear vibrating screen described in the utility model is +13mm or +25mm or +30mm.

[0014] The inlet of the desludging screen described in the utility model is connected to the raw coal conveying mechanism, the raw coal conveying mechanism includes a raw coal bin, a coal feeder, an iron remover, and a coal conveying belt. The outlet of the raw coal bin is connected to the coal feeder, the coal feeder is connected to the inlet of the desludging screen via the coal conveying belt, and the iron remover is installed on the coal conveying belt.

[0015] The utility model adopts the above-mentioned scheme to solve the problems of ash fluctuation in clean coal and high calorific value of medium coal caused by the inability to fully dissociate the raw coal, effectively improves the sorting density of the main washing system, greatly improves the comprehensive clean coal yield, creates considerable economic benefits, and realizes the maximum utilization of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings:

[0018] As shown in the attached drawings, a heavy medium coal preparation plant lump coal product crushing and reselection process system is characterized by comprising a desludging screen 1, a three-product heavy medium cyclone 2, a clean coal curved screen 3, a medium coal curved screen 4, a gangue curved screen 5, a clean coal linear vibrating screen 6, a medium coal linear vibrating screen 7, and a gangue linear vibrating screen 8. The desludging screen 1 has an upper screen outlet connected to the inlet of the three-product heavy medium cyclone 2, and the clean coal outlet, the medium coal outlet, and the gangue outlet of the three-product heavy medium cyclone 2 are respectively It is connected to the clean coal curved screen 3, the medium coal curved screen 4, and the gangue curved screen 5. The clean coal curved screen 3, the medium coal curved screen 4, and the gangue curved screen 5 are respectively connected to the clean coal linear vibrating screen 6, the medium coal linear vibrating screen 7, and the gangue linear vibrating screen 8. The clean coal block outlet and the medium coal block outlet on the clean coal linear vibrating screen 6 and the medium coal linear vibrating screen 7 are respectively connected to the inlet of the crusher 9. The outlet of the crusher 9 is connected to the inlet of the desludging screen 1 through the mixing barrel 10 and the mixing pump 11.

[0019] Further, the under-screen outlet of the desludging screen 1 is connected to the inlet of the hydraulic classification cyclone 12, the underflow outlet of the hydraulic classification cyclone 12 is connected to the interference bed separator 13, the interference bed separator 13 is connected to the first curved screen 14, the coarse coal slime outlet on the screen of the first curved screen 14 is connected to the inlet of the coarse coal centrifuge 15, the clean coal outlet of the coarse coal centrifuge 15 is connected to the clean coal bin 17 via the belt 16, the centrifuge liquid outlet of the coarse coal centrifuge 15 is connected to the flotation machine 18, the under-screen outlet of the first curved screen 14 is connected to the inlet of the flotation machine 18, the concentrate outlet of the flotation machine 18 is connected to the horizontal sedimentation filtration type centrifugal dehydrator 20 via the second curved screen 19, and the horizontal sedimentation filtration type centrifugal dehydrator 20 is connected to the horizontal sedimentation filtration type centrifuge. The fine-grained clean coal slime outlet of the dewatering machine 20 is connected to the clean coal bin 17 via the belt 16, the centrifuge outlet of the horizontal sedimentation filtering centrifugal dewatering machine 20 and the tailings outlet of the flotation machine 18 are respectively connected to the rake thickener 21, the overflow outlet of the rake thickener 21 is connected to the circulating water pool 22, the circulating water pool 22 is respectively connected to the water replenishment ports of the clean coal linear vibrating screen 6, the medium coal linear vibrating screen 7, and the gangue linear vibrating screen 8 via the circulating pump 23, the underflow port of the rake thickener 21 is connected to the filter press 24, the filter cake outlet of the filter press 24 is tail coal slime, the filtrate outlet of the filter press 24 is connected to the inlet of the circulating water pool 22, and the overflow port of the hydraulic classification cyclone 12 is connected to the inlet of the flotation machine 18.

[0020] Furthermore, the fine clean coal outlet under the screen of the clean coal linear vibrating screen 6 is connected to the clean coal centrifuge 25, the clean coal outlet of the clean coal centrifuge 25 is connected to the clean coal bin 17 via the belt 16, the liquid outlet of the clean coal centrifuge 25 is connected to the inlet of the mixing barrel 10, and the product of the fine medium coal outlet under the screen of the medium coal linear vibrating screen 7 is a medium coal product.

[0021] Further, the under-screen dilute medium outlet of the clean coal linear vibrating screen 6 is connected to the inlet of the clean coal magnetic separator 27, the concentrate outlet of the clean coal magnetic separator 27 is connected to the supplementary medium cylinder 28, the supplementary medium cylinder 28 is connected to the water distribution pipe of the three-product heavy medium cyclone 2 via the medium pump 29, the tailings outlet of the clean coal magnetic separator 27 is connected to the inlet of the mixing barrel, the under-screen dilute medium outlet of the medium coal linear vibrating screen 7 is connected to the medium coal magnetic separator 30, the concentrate outlet of the medium coal magnetic separator 30 is connected to the supplementary medium cylinder 28, the tailings outlet of the medium coal magnetic separator 30 is connected to the concentrating cyclone 31, the underflow outlet of the concentrating cyclone 31 is connected to the first vibrating screen 32, the product of the over-screen outlet of the first vibrating screen 32 is medium coal slime, and the under-screen outlet of the first vibrating screen 32 is connected to the inlet of the flotation machine 18.

[0022] Furthermore, the on-screen product outlet of the gangue linear vibrating screen 8 is a gangue product, the dilute medium outlet of the gangue linear vibrating screen 8 is connected to the inlet of the medium magnetic separator 30, and the qualified medium outlet of the gangue linear vibrating screen is connected to the inlet of the supplementary medium cylinder.

[0023] Furthermore, the under-screen outlet of the clean coal curved screen 3 and the under-screen qualified medium outlet of the clean coal linear vibrating screen 6 are respectively connected to the inlet of the clean coal magnetic separator 27 and the inlet of the supplementary medium cylinder 28 through the diverter 26, the under-screen outlet of the medium coal curved screen 4 and the under-screen qualified medium outlet of the medium coal linear vibrating screen 7 are connected to the inlet of the supplementary medium cylinder 28, and the under-screen outlet of the gangue curved screen is connected to the inlet of the supplementary medium cylinder.

[0024] Furthermore, the crushing particle size of the crusher 9 is -3mm, -6mm or -13mm.

[0025] Furthermore, the sieve plate filtering particle size of the clean coal linear vibrating screen 6 and the medium coal linear vibrating screen 7 is +13mm or +25mm or +30mm.

[0026] Furthermore, the inlet of the desludging screen 1 is connected to the raw coal conveying mechanism, which includes a raw coal bin 33, a coal feeder 34, an iron remover 35, and a coal conveying belt 36. The outlet of the raw coal bin 33 is connected to the coal feeder 34, and the coal feeder 34 is connected to the inlet of the desludging screen 1 via the coal conveying belt 36, on which the iron remover 35 is installed.

[0027] The specific process of this utility model is as follows:

[0028] The raw coal is placed in the raw coal bin 33, and falls into the coal feeder 34 through the outlet of the raw coal bin 33. The raw coal on the coal feeder 34 is transported to the coal conveyor 36. The raw coal on the coal conveyor 36 is screened by the iron remover 35 and then enters the desludging screen 1. The screen product outlet of the desludging screen 1 enters the three-product heavy medium cyclone 2. The clean coal outlet of the three-product heavy medium cyclone 2 passes through the screen of the clean coal arc screen 3 and is fed into the clean coal linear vibrating screen 6. The three-product heavy medium cyclone The medium coal outlet of 2 is fed into the medium coal linear vibrating screen 7 through the screen of the medium coal curved screen 4, the gangue outlet of the three-product heavy medium cyclone 2 is fed into the gangue linear vibrating screen 8 through the screen of the gangue curved screen 5, the clean coal block outlet on the screen of the clean coal linear vibrating screen 6 and the medium coal block outlet on the screen of the medium coal linear vibrating screen 7 are transported to the crusher 9, and after being crushed by the crusher 9, they are transported to the screen inlet of the desludging screen 1 through the mixing barrel 10 and the mixing pump 11;

[0029] The fine clean coal of the clean coal linear vibrating screen 6 is transported to the clean coal centrifuge 25, the clean coal outlet of the clean coal centrifuge 25 is transported to the clean coal bin 17 via the belt 16, the centrifugal liquid of the clean coal centrifuge 25 enters the mixing barrel, the dilute medium of the clean coal linear vibrating screen 6 is transported to the clean coal magnetic separator 27, the concentrate product of the clean coal magnetic separator 27 is transported to the supplementary medium cylinder 28, the tailings product of the clean coal magnetic separator 27 is sent out of the mixing barrel, and the liquid in the supplementary medium cylinder 28 is transported to the liquid replenishment pipe of the three-product heavy medium cyclone 2 via the supplementary pump;

[0030] The final medium coal product at the final medium coal outlet of the medium coal linear vibrating screen 7 is a medium coal product, the dilute medium at the dilute medium outlet of the medium coal linear vibrating screen 7 is transported to the medium coal magnetic separator 30, the concentrate at the concentrate outlet of the medium coal magnetic separator 30 is transported to the supplementary medium cylinder 28, the tailings product of the medium coal magnetic separator 30 is transported to the thickening cyclone 31, the underflow of the thickening cyclone 31 is transported to the first vibrating screen 32, the underscreen product of the first vibrating screen 32 enters the inlet of the flotation machine 18, the overscreen product of the first vibrating screen 32 is a medium coal product, and the overflow product of the thickening cyclone 31 enters the inlet of the flotation machine 18;

[0031] The products on the screen of the gangue linear vibrating screen 8 are gangue products, and the dilute medium outlet products of the gangue linear vibrating screen 8 enter the medium coal magnetic separator 30;

[0032] The undersize products of the clean coal curved screen 3 and the qualified medium products of the clean coal linear vibrating screen 6 are respectively input into the clean coal magnetic separator 27 and the supplementary medium cylinder 28 through the diverter 26, and the undersize products of the medium coal curved screen 4 and the combined medium outlet products of the medium coal linear vibrating screen 7 enter the supplementary medium cylinder 28;

[0033] The undersize product of the desludging screen 1 is input to the inlet of the hydraulic classification cyclone 12, the underflow of the hydraulic classification cyclone 12 is transported to the interference bed separator 13, the outlet product of the interference bed separator 13 is transported to the first curved screen 14, the coarse coal slime on the screen of the first curved screen 14 is transported to the inlet of the coarse coal centrifuge 15, the clean coal slime of the coarse coal centrifuge 15 is transported to the clean coal bin 17 via the belt 16, the centrifugal liquid of the coarse coal centrifuge 15 is transported to the flotation machine 18, the undersize product at the outlet of the first curved screen 14 is transported to the inlet of the flotation machine 18, the concentrate at the concentrate outlet of the flotation machine 18 is transported to the horizontal sedimentation filtration type centrifugal dehydrator 20 via the second curved screen 19, and the horizontal sedimentation filtration type centrifugal dehydrator 20 is connected. The fine-grained clean coal slime at the outlet is transported to the clean coal bunker 17 via the belt 16; the centrifuge liquid outlet product of the horizontal sedimentation filtering centrifugal dehydrator 20 and the tailings outlet product of the flotation machine 18 are transported to the rake thickener 21; the overflow outlet product of the rake thickener 21 is transported to the circulating water pool 22; the liquid in the circulating water pool 22 is transported to the water replenishment ports of the clean coal linear vibrating screen 6, the medium coal linear vibrating screen 7 and the gangue linear vibrating screen 8 respectively via the circulating pump 23; the underflow port product of the rake thickener 21 is transported to the filter press 24; the filter cake of the filter press 24 is the tailings slime; the filtrate of the filter press 24 is transported to the circulating water pool 22; and the overflow product of the hydraulic classification cyclone 12 is transported to the inlet of the flotation machine 18.

[0034] The utility model introduces the lump clean coal and lump medium coal of +13mm, +25mm or +30mm particle size into the crusher 9, and crushes them to -3mm, -6mm or -13mm. By realizing the graded crushing and returning of the clean coal and medium coal products after sorting, the problems of unstable clean coal ash content and high calorific value of medium coal caused by clean coal containing gangue and medium coal containing clean coal are solved, and the resource utilization is maximized. Through the buffering and transfer of the mixing barrel 10 and the mixing pump 11, the lump medium coal and lump clean coal products dissociated after crushing are returned to the original system and mixed with the mine raw coal as the total raw coal for washing. When the coal dissociation degree is improved, the ash in the raw coal entering the washing process changes, which improves the selectivity of the raw coal entering the washing process, and the clean coal yield and recovery rate are further improved. For sites where the raw coal entering the washing process is not fully dissociated, the clean coal and medium coal products can be graded, crushed and re-selected. Under the premise of little impact on the original main washing process, the problems of clean coal ash fluctuation and high calorific value of medium coal caused by the inability to fully dissociate the raw coal are solved, the sorting density of the main washing system is effectively improved, the comprehensive clean coal yield is greatly improved, considerable economic benefits are created, and resource utilization is maximized.

Claims

1. A heavy medium coal preparation plant lump coal product crushing and re-selection process system, characterized in that it includes a desludging screen, a three-product heavy medium cyclone, a clean coal curved screen, a medium coal curved screen, a gangue curved screen, a clean coal linear vibrating screen, a medium coal linear vibrating screen, and a gangue linear vibrating screen, the desludging screen's screen outlet is connected to the inlet of the three-product heavy medium cyclone, the clean coal outlet, the medium coal outlet, and the gangue outlet of the three-product heavy medium cyclone are respectively connected to the clean coal curved screen, the medium coal curved screen, and the gangue curved screen, the clean coal curved screen, the medium coal curved screen, and the gangue curved screen are respectively connected to the clean coal linear vibrating screen, the medium coal linear vibrating screen, and the gangue linear vibrating screen, the lump clean coal outlet and the lump medium coal outlet on the clean coal linear vibrating screen and the medium coal linear vibrating screen are respectively connected to the inlet of a crusher, and the outlet of the crusher is connected to the inlet of the desludging screen via a mixing barrel and a mixing pump.

2. A heavy medium coal preparation plant lump coal product crushing and re-selection process system according to claim 1, characterized in that The desludging screen has an outlet below the screen connected to the inlet of the hydraulic classification cyclone, the bottom flow outlet of the hydraulic classification cyclone is connected to the interference bed separator, the interference bed separator is connected to the first curved screen, the coarse coal slime outlet on the screen of the first curved screen is connected to the inlet of the coarse coal centrifuge, the clean coal outlet of the coarse coal centrifuge is connected to the clean coal bin via a belt, the centrifuge liquid outlet of the coarse coal centrifuge is connected to the flotation machine, the outlet below the screen of the first curved screen is connected to the inlet of the flotation machine, the concentrate outlet of the flotation machine is connected to the horizontal sedimentation filtration type centrifugal dehydrator via the second curved screen, and the horizontal sedimentation filtration type centrifugal dehydrator is connected to the horizontal sedimentation filtration type centrifugal dehydrator. The fine-grained clean coal slime outlet of the water machine is connected to the clean coal bin through a belt, the centrifuge liquid outlet of the horizontal sedimentation filtration centrifugal dehydrator and the tailings outlet of the flotation machine are respectively connected to the rake thickener, the overflow outlet of the rake thickener is connected to the circulating water pool, the circulating water pool is respectively connected to the water replenishment ports of the clean coal linear vibrating screen, the medium coal linear vibrating screen and the gangue linear vibrating screen through a circulating pump, the underflow port of the rake thickener is connected to the filter press, the filter cake outlet of the filter press is tailings slime, the filtrate outlet of the filter press is connected to the inlet of the circulating water pool, and the overflow port of the hydraulic grading cyclone is connected to the inlet of the flotation machine.

3. The heavy medium coal preparation plant lump coal product crushing and re-selection process system according to claim 1 is characterized in that The fine clean coal outlet under the screen of the clean coal linear vibrating screen is connected to the clean coal centrifuge, the clean coal outlet of the clean coal centrifuge is connected to the clean coal bin via a belt, the liquid outlet of the clean coal centrifuge is connected to the inlet of the mixing barrel, and the product of the fine medium coal outlet under the screen of the medium coal linear vibrating screen is the medium coal product.

4. A heavy medium coal preparation plant lump coal product crushing and re-selection process system according to claim 1, characterized in that The under-screen dilute medium outlet of the clean coal linear vibrating screen is connected to the inlet of the clean coal magnetic separator, the concentrate outlet of the clean coal magnetic separator is connected to the supplementary medium cylinder, the supplementary medium cylinder is connected to the water distribution pipe of the three-product heavy medium cyclone via a medium pump, the tailings outlet of the clean coal magnetic separator is connected to the inlet of the mixing barrel, the under-screen dilute medium outlet of the medium coal linear vibrating screen is connected to the medium coal magnetic separator, the concentrate outlet of the medium coal magnetic separator is connected to the supplementary medium cylinder, the tailings outlet of the medium coal magnetic separator is connected to the concentrating cyclone, the underflow outlet of the concentrating cyclone is connected to the first vibrating screen, the product of the over-screen outlet of the first vibrating screen is medium coal slime, and the under-screen outlet of the first vibrating screen is connected to the inlet of the flotation machine.

5. The heavy medium coal preparation plant lump coal product crushing and re-selection process system according to claim 1 is characterized in that The on-screen product outlet of the gangue linear vibrating screen is the gangue product, the dilute medium outlet of the gangue linear vibrating screen is connected to the inlet of the medium magnetic separator, and the qualified medium outlet of the gangue linear vibrating screen is connected to the inlet of the supplementary medium cylinder.

6. The heavy medium coal preparation plant lump coal product crushing and re-selection process system according to claim 1, characterized in that The under-screen outlet of the clean coal curved screen and the qualified under-screen medium outlet of the clean coal linear vibrating screen are respectively connected to the inlet of the clean coal magnetic separator and the inlet of the supplementary medium cylinder through a diverter, the under-screen outlet of the medium coal curved screen and the qualified under-screen medium outlet of the medium coal linear vibrating screen are connected to the inlet of the supplementary medium cylinder, and the under-screen outlet of the gangue curved screen is connected to the inlet of the supplementary medium cylinder.

7. The heavy medium coal preparation plant lump coal product crushing and re-selection process system according to claim 1 is characterized in that The crushing particle size of the crusher is -3mm, -6mm or -13mm.

8. The heavy medium coal preparation plant lump coal product crushing and re-selection process system according to claim 1, characterized in that The sieve plate filtering particle size of the clean coal linear vibrating screen and the medium coal linear vibrating screen is +13mm, +25mm or +30mm.

9. The heavy medium coal preparation plant lump coal product crushing and re-selection process system according to claim 1, characterized in that The inlet of the desludging screen is connected to the raw coal conveying mechanism, which includes a raw coal bin, a coal feeder, an iron remover, and a coal conveying belt. The outlet of the raw coal bin is connected to the coal feeder, and the coal feeder is connected to the inlet of the desludging screen via the coal conveying belt, and the iron remover is installed on the coal conveying belt.

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