Integratable efficient raw coal preparation and treatment system and raw coal preparation and treatment method

Abstract

The invention belongs to the field of raw coal preparation processing operation of coal processing and washing, and particularly relates to an integrated efficient raw coal preparation processing system and a raw coal preparation processing method. The system is intensively arranged in an integrated raw coal preparation workshop, and the workshop is divided into six layers from top to bottom: a head of a belt from a main shaft to a raw coal bunker A, an iron remover and a raw coal passing type crusher are arranged on the sixth layer; the tail of the belt from the main shaft to the raw coal bunker B, the head of the belt from the raw coal bunker to the preparation workshop and the raw coal distributing and screening scraper are arranged on the fifth layer; the two 80 mm or 50 mm raw coal classifying screens and the two TDS intelligent dry separators are arranged on the fourth layer; the two raw coal crushers, the two 10 / 3mm double-layer powder removing sieves and the first powder removing sieve intermediate scraper are arranged on the third layer; the raw coal washing-in belt and the pulverized coal scraper blade below the pulverized coal removing sieve are arranged on the second layer; the gangue belt and the pulverized raw coal belt are arranged on the first layer; and the components are sequentially connected through the chute.

Description

Technical Field

[0001] This invention belongs to the field of raw coal preparation and processing operations in coal processing and washing, specifically an integrated high-efficiency raw coal preparation and processing system and a raw coal preparation and processing method. Background Technology

[0002] Traditionally, the raw coal preparation process in power coal preparation plants typically employs a process of 80 (50) / 10mm raw coal grading and +3mm coal depulverization: After the raw coal is graded by the Φ80 (50)mm raw coal grading screen in the raw coal preparation workshop, the +80 (50)mm gangue is discharged into the gangue bin, and the +80 (50)mm raw coal is crushed and collected with the -80 (50)mm undersize material, then transported to the raw coal bin for storage via the overflow bin or transfer point. When separation is required, the raw coal is returned to the depulverization workshop for grading and depulverization via the overflow bin or transfer point: The -80 (50)mm raw coal is first graded by the Φ10mm raw coal grading screen, and the material on the 80-10mm screen enters the main washing system for separation. The -10mm undersize fine coal is depulverized by 3mm, and the -3mm pulverized coal is used as fine coal product. The 10-3mm fine coal enters the washing and beneficiation system or is sold as fine coal.

[0003] Due to the large storage requirements of raw coal silos, the silo diameter is generally Φ18-Φ30m and the height is usually around 50m. However, the conveyor belt angle is generally required to be ≤18°, resulting in the conveyor belt bridge from the preparation workshop to the raw coal silo needing to be over 160m long. Considering factors such as the site topography, this is usually addressed through design optimizations such as adding overflow silos and conveyor belt bridges. This leads to a circuitous and dispersed industrial layout throughout the plant, which is not entirely simple and rational, and significantly increases the project cost. Secondly, traditional raw coal preparation workshops include multiple pieces of equipment such as conveyor belts, grading screens, intelligent dry separators, and crushers. If a certain piece of equipment fails, it will restrict and affect the normal lifting of raw coal in the mine, reducing production efficiency. In addition, when the raw coal bunker returns to the de-pulverizing workshop for 10 / 3mm grading de-pulverization, the accuracy of the amount of coal washed or the amount of screen powder adjusted according to the market is low. When the market demand for washed lump coal and washed fine coal is large, it is impossible to achieve full washing function. In addition, the conveyor belt feeds the 80mm and 10 / 3mm grading screens through the setting of branch chutes, making it difficult to achieve full cross-section material distribution, reducing the impact on screening efficiency and effect, and reducing washing and processing efficiency. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an integrated, high-efficiency raw coal preparation and processing system and a raw coal preparation and processing method.

[0005] The present invention adopts the following technical solution: an integrated high-efficiency raw coal preparation and processing system, including: a conveyor belt from the main shaft to the raw coal bunker A, an iron remover, a raw coal through-type crusher, a conveyor belt from the main shaft to the raw coal bunker B, a conveyor belt from the raw coal bunker back to the preparation workshop, a raw coal distribution screen scraper, an 80mm or 50mm raw coal grading screen, a TDS intelligent dry separator, a scraper under the grading screen, a 10 / 3mm double-layer de-pulverizing screen, a scraper for intermediate material of the de-pulverizing screen, a raw coal crusher, a raw coal washing conveyor belt, a gangue conveyor belt, a pulverized coal scraper under the de-pulverizing screen, a fine raw coal conveyor belt, and corresponding connecting chutes; The system is centrally located within an integrated raw coal preparation workshop, which has a six-story structure from top to bottom. The arrangement of the components is as follows: The conveyor head of the main shaft to raw coal bunker A, the iron remover, and the raw coal through-type crusher are arranged on the sixth layer; The tail end of the conveyor belt from the main shaft to the raw coal bunker B, the head end of the conveyor belt from the raw coal bunker back to the preparation workshop, and the raw coal distribution screen scraper are arranged on the fifth layer. The two 80mm or 50mm raw coal grading screens and the two TDS intelligent dry separators are arranged in a dual system on the fourth floor; The two raw coal crushers, the two 10 / 3mm double-layer de-pulverizing screens, and one de-pulverizing screen intermediate scraper are arranged in the third layer; The raw coal washing belt and the pulverized coal scraper under the de-pulverizing screen are arranged in the second layer; The gangue conveyor belt and the raw coal conveyor belt are arranged in the first layer; The components are connected sequentially via chutes, allowing materials to flow between floors by gravity or mechanical power, forming a complete processing flow.

[0006] In some embodiments, a chute leading to the second layer of raw coal washing conveyor belt is provided on the east side of the grading screen scraper, forming a bypass channel that allows the -80mm or -50mm screen material to directly enter the washing conveyor belt without undergoing the third layer of de-pulverization treatment.

[0007] In some embodiments, an adjustable coal quantity gate is installed at the eastern end of the intermediate scraper of the de-pulping screen for selectively distributing 10-3mm granular coal to the second layer of the raw coal washing belt or the first layer of the final raw coal belt.

[0008] In some embodiments, the raw coal through-type crusher arranged on the sixth floor is equipped with a sliding track so that it can be moved to the side in case of failure, and is equipped with a corresponding bypass chute so that the raw coal can fall directly to the main shaft to the raw coal bunker B conveyor belt on the fifth floor.

[0009] In some embodiments, the 80mm or 50mm raw coal grading screen, the TDS intelligent dry separator, the raw coal crusher, and the 10 / 3mm double-layer descaling screen are symmetrically arranged in pairs to form two parallel and independently operating processing systems.

[0010] A method for preparing and processing raw coal includes the following steps: Material hoisting and pretreatment steps: The raw coal underground is conveyed to the sixth layer via the main shaft to the raw coal bunker A belt, and then successively passes through the iron remover for iron removal and the raw coal through-type crusher for crushing to -250mm. After that, it is conveyed to the raw coal bunker B via the main shaft to the raw coal bunker. Material return and grading steps: Raw coal is returned to the preparation workshop via the raw coal silo and then conveyed back to the fifth layer by the raw coal distribution screen scraper. It is then fed into the 80mm or 50mm raw coal grading screen on the fourth layer for grading to obtain oversize and undersize materials. Intelligent sorting and crushing steps: The material over the screen is fed into the TDS intelligent dry separator to separate gangue and raw coal, wherein the raw coal and / or gangue is crushed by the raw coal crusher; De-pulverization and path selection steps: The undersize material is fed into the third layer of the 10 / 3mm double-layer de-pulverization screen via the graded undersize scraper for de-pulverization. The obtained 80-10mm material enters the raw coal washing belt. The 10-3mm material is adjusted and distributed to the raw coal washing belt or the fine raw coal belt via the intermediate scraper of the de-pulverization screen. The -3mm material is fed into the fine raw coal belt via the pulverized coal scraper under the de-pulverization screen. Product output steps: raw coal is conveyed by the raw coal washing belt, gangue is conveyed by the gangue belt, and fine coal product is conveyed by the fine raw coal belt.

[0011] In some embodiments, a full-wash mode is also included: after the grading step, the -80mm or -50mm undersize material is directly fed into the second layer of the raw coal washing conveyor belt via a bypass chute on the east side of the grading undersize scraper, bypassing the third layer of de-pulverization treatment.

[0012] In some embodiments, if the raw coal through-type crusher malfunctions during the material lifting and pretreatment step, it is removed, allowing the raw coal to fall directly onto the main shaft to the raw coal bunker B conveyor belt via a bypass chute, thus maintaining the continuity of raw coal transportation.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention integrates a high-efficiency raw coal preparation and processing system and method, which realizes multi-functional operations of screening, crushing and de-pulverizing in an integrated raw coal workshop. It optimizes the layout of the preparation workshop, eliminates the need for the construction of conveyor belt corridors from the overflow bin to the raw coal bin and from the raw coal bin back to the overflow bin, and makes the plant layout more compact and reasonable, the plant layout more simple and smooth, and the project cost significantly reduced.

[0014] The equipment from the main shaft to the raw coal bunker consists of only two pieces of equipment: a conveyor belt and a through-type crusher. The through-type crusher is flexible and adjustable. Compared with the traditional raw coal preparation workshop, which includes multiple pieces of equipment such as conveyor belts, grading screens, intelligent dry separators, and crushers, the equipment failure rate is greatly reduced, which reduces the time that restricts the normal hoisting of raw coal in the mine and ensures the normal operation of underground production.

[0015] According to market needs, the system can achieve partial and full washing of raw coal, making the process system more flexible and efficient: during partial washing, raw coal of 10-3.0mm grade can be flexibly entered into the washing system or bypass, and the amount of coal can be precisely adjusted; at the same time, the system can achieve full washing of raw coal of 50 (80)-0mm grade, which significantly improves the washing and processing efficiency.

[0016] The raw coal preparation plant has achieved centralized and unified management, which has improved the standardization level of coal preparation plant quality. Attached Figure Description

[0017] Figure 1 This is a plan view of the industrial site layout of the integrated raw coal preparation workshop of this invention; Figure 2 This is an elevation view of the industrial site layout of the integrated raw coal preparation workshop of this invention. Figure 3 This is a system diagram of the integrated raw coal preparation workshop of the present invention; Attached diagrams: 1. Belt conveyor A from the main shaft to the raw coal bunker; 2. Iron separator; 3. Through-type crusher; 4. Belt conveyor B from the main shaft to the raw coal bunker; 5. Belt conveyor from the raw coal bunker back to the preparation workshop; 6. Raw coal distribution screen scraper; 7. Φ80(50)mm raw coal grading screen; 8. TDS intelligent dry separator; 9. Scraper under the grading screen; 10. Φ10 / 3mm double-layer de-pulverizing screen; 11. Scraper for granular coal in the middle of the de-pulverizing screen; 12. Raw coal crusher; 13. Raw coal washing belt; 14. Gangue belt; 15. Pulverized coal scraper; 16. Fine raw coal belt. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] An integrated high-efficiency raw coal preparation and processing system mainly consists of a conveyor belt 1 from the main shaft to the raw coal bunker A, an iron remover 2, a raw coal through-type crusher 3, a conveyor belt 4 from the main shaft to the raw coal bunker B, a conveyor belt 5 from the raw coal bunker back to the preparation workshop, a raw coal distribution screen scraper 6, a Φ80(50)mm raw coal grading screen 7, a TDS intelligent dry separator 8, a scraper under the grading screen 9, a Φ10 / 3mm double-layer de-pulverizing screen 10, a scraper for intermediate material of the de-pulverizing screen 11, a raw coal crusher 12, a raw coal washing conveyor belt 13, a gangue conveyor belt 14, a pulverized coal scraper under the de-pulverizing screen 15, a final raw coal conveyor belt 16, and corresponding chutes and other components.

[0020] The design of the integrated raw coal preparation workshop is optimized and arranged into six layers: The main shaft to raw coal bunker A conveyor belt head 1, iron remover 2, and through-type crusher 3 are located on the sixth floor. After the main shaft to raw coal bunker A conveyor belt head 1 ascends to the top floor of the integrated preparation workshop, the iron remover 2 is installed diagonally above A conveyor belt head 1 to remove iron mixed in with the raw coal. The raw coal through-type crusher 3 is located directly below A conveyor belt head 1, crushing the iron-removed raw coal to -250mm. The main shaft to raw coal bunker B conveyor belt tail 4, the raw coal bunker return conveyor belt 5, and the raw coal distribution screen scraper 6 are located on the fifth floor. The main shaft to raw coal bunker B conveyor belt tail 4 is located below the raw coal through-type crusher 3 at the discharge port, responsible for transporting the crushed -250mm raw coal to the raw coal bunker. The raw coal bunker return conveyor belt head 5 is located on another span of the fifth floor, with the raw coal distribution screen scraper 6 installed at the discharge port below, transporting the -250mm raw coal returning from the raw coal bunker. The raw coal is fed to the lower layer of the Φ80 (50) mm raw coal grading screen 7 for grading and screening; two Φ80 (50) mm raw coal grading screens 7 and two TDS intelligent dry separators 8 are arranged in a dual system on the fourth layer. The Φ80 (50) mm raw coal grading screen 7 is located below the raw coal distribution scraper 6, which classifies the -250 mm raw coal into +80 (50) mm oversize and -80 (50) mm undersize. The oversize material is discharged from the outlet in the direction of coal flow. A TDS intelligent dry separator 8 is installed to separate the raw coal and gangue in the +80 (50) mm material; a grading under-screen scraper 9 is arranged vertically to the coal flow direction at the under-screen discharge port, which is located on the same floor and spans the longitudinal width of the two screens. A downward transport chute is installed on the east side of the under-screen scraper 9 (the side closest to the main plant). In the case of bypass, the graded -80 (50) mm raw coal can be transported to the raw coal washing belt 13 on the second floor to form a full washing channel.Two raw coal crushers 12, two Φ10 / 3mm double-layer desiccant screens 10, and one desiccant screen intermediate scraper 11 are located on three layers. The two crushers 12 are respectively arranged at the gangue discharge port of each TDS intelligent dry separator 8 to crush and separate large pieces of raw coal and gangue. The double-layer desiccant screens 10 are arranged on the lower layer, perpendicular to the coal flow transport direction of the raw coal grading screen scraper 9. The desiccant screen intermediate scraper 11 is installed at its discharge port, perpendicular to the screening direction of the double-layer desiccant screens 10, serving as a common channel for transporting 10-3mm granular coal between the two desiccant screens 10. Two adjustable coal flow gates are installed at the eastern end of the scraper 11 to flexibly adjust the coal flow according to actual production conditions. The raw coal washing belt 13 on the second floor or the fine coal belt 16 on the first floor are adjusted and distributed to the second floor for washing or sold directly as fine coal. The lower discharge port of the double-layer de-pulverizing screen 10, the raw coal washing belt 13, and the pulverized coal scraper 15 under the de-pulverizing screen are arranged on the second floor. A chute is arranged on the front section of the Φ10mm screen on the upper layer of the de-pulverizing screen 10 to transport the 80(50)-10mm screen material to the raw coal washing belt 13 for sorting in the main plant. At the same time, as mentioned above, some or all of the 10-3mm material can also be adjusted for washing as needed. The pulverized coal scraper 15 under the de-pulverizing screen is arranged below its discharge port along the longitudinal direction of the double-layer de-pulverizing screen 10 to transport -3mm pulverized coal to the fine coal belt 16 on the first floor. The gangue belt 14 and the fine raw coal belt 16 are arranged on the first floor to transport gangue and fine coal to the gangue bin and fine coal bin, respectively.

[0021] The main shaft conveyor belt from the main shaft to the raw coal bunker A transports raw coal to the top floor of the integrated preparation workshop. After removing iron, anchor bolts, and other debris from the raw coal using an iron remover, the raw coal is crushed to -250mm by a through-type crusher located below. It is then transported to the raw coal bunker via conveyor belt B from the main shaft. The through-type crusher can be designed with a sliding track, allowing it to be moved aside in case of malfunction, while the raw coal can still be transported directly to the raw coal bunker via a bypass chute and conveyor belt B from the main shaft. After iron removal and large-piece crushing, the raw coal is buffered and stored in the raw coal bunker before being transported back to the second-floor section of the integrated preparation workshop via a return conveyor belt trestle. The raw coal is evenly fed to the Φ80 (50) mm raw coal grading screen by the raw coal distribution scraper. After grading, the material on the +80 (50) mm screen is removed by the TDS intelligent dry separator. Large pieces of gangue are crushed and transported to the gangue bin by the gangue belt. Large pieces of raw coal are crushed to -80 (50) mm and then enter the washing belt. The material under the -80 (50) mm screen is fed to the Φ10 / 3 mm double-layer de-pulverizing screen by the under-screen distribution scraper for 10 mm grading and 3 mm de-pulverization. The material on the 80 (50) -10 mm screen is transported to the washing belt by the chute and enters the main plant for sorting. The material in the 10-3 mm intermediate stage can be transported to the washing belt for sorting in the main plant by the granular coal scraper, or it can be sent to the lower fine coal belt as a product for direct sale according to the actual production situation. The material under the -3 mm screen is transported to the fine coal belt by the pulverized coal scraper under the de-pulverizing screen and is also sold directly as a product. In addition, in order to flexibly respond to the market changes caused by the increased demand for washed fine coal, the material under the -80 (50) mm screen can also be directly transported to the main plant for sorting without going through the 10 / 3 mm grading and de-powdering process.

[0022] A method for preparing and processing raw coal includes the following steps: Material hoisting and pretreatment steps: The raw coal underground is conveyed to the sixth layer via the main shaft to the raw coal bunker A belt, and then successively passes through the iron remover for iron removal and the raw coal through-type crusher for crushing to -250mm. After that, it is conveyed to the raw coal bunker B via the main shaft to the raw coal bunker. Material return and grading steps: Raw coal is returned to the preparation workshop via the raw coal silo and then conveyed back to the fifth layer by the raw coal distribution screen scraper. It is then fed into the 80mm or 50mm raw coal grading screen on the fourth layer for grading to obtain oversize and undersize materials. Intelligent sorting and crushing steps: The material over the screen is fed into the TDS intelligent dry separator to separate gangue and raw coal, wherein the raw coal and / or gangue is crushed by the raw coal crusher; De-pulverization and path selection steps: The undersize material is fed into the third layer of the 10 / 3mm double-layer de-pulverization screen via the graded undersize scraper for de-pulverization. The obtained 80-10mm material enters the raw coal washing belt. The 10-3mm material is adjusted and distributed to the raw coal washing belt or the fine raw coal belt via the intermediate scraper of the de-pulverization screen. The -3mm material is fed into the fine raw coal belt via the pulverized coal scraper under the de-pulverization screen. Product output steps: raw coal is conveyed by the raw coal washing belt, gangue is conveyed by the gangue belt, and fine coal product is conveyed by the fine raw coal belt.

[0023] It also includes a full-wash mode: after the grading step, the -80mm or -50mm undersize material is directly fed into the second layer of the raw coal washing belt through the bypass chute on the east side of the grading undersize scraper, bypassing the third layer of depulverization treatment.

[0024] In the material lifting and pretreatment step, if the raw coal through crusher malfunctions, it is removed so that the raw coal falls directly to the main shaft to the raw coal bunker B conveyor belt through the bypass chute, thus maintaining the continuity of raw coal transportation.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated, high-efficiency raw coal preparation and processing system, characterized in that, include: Main shaft to raw coal bunker A belt (1), iron remover (2), raw coal through crusher (3), main shaft to raw coal bunker B belt (4), raw coal bunker return to preparation workshop belt (5), raw coal distribution screen scraper (6), 80mm or 50mm raw coal grading screen (7), TDS intelligent dry separator (8), grading screen scraper (9), 10 / 3mm double-layer de-pulverizing screen (10), de-pulverizing screen intermediate scraper (11), raw coal crusher (12), raw coal washing belt (13), gangue belt (14), de-pulverizing screen pulverized coal scraper (15), fine raw coal belt (16) and corresponding connecting chutes; The system is centrally located within an integrated raw coal preparation workshop, which has a six-story structure from top to bottom. The arrangement of the components is as follows: The head of the conveyor belt (1) from the main shaft to the raw coal bunker A, the iron remover (2) and the raw coal through crusher (3) are arranged on the sixth layer; The tail of the conveyor belt (4) from the main shaft to the raw coal bunker B, the head of the conveyor belt (5) from the raw coal bunker back to the preparation workshop, and the raw coal distribution screen scraper (6) are arranged on the fifth layer. The two 80mm or 50mm raw coal grading screens (7) and the two TDS intelligent dry separators (8) are arranged in a dual system on the fourth layer; Two raw coal crushers (12), two 10 / 3mm double-layer de-pulverizing screens (10) and one de-pulverizing screen intermediate scraper (11) are arranged in the third layer; The raw coal washing belt (13) and the pulverized coal scraper (15) under the de-pulverization screen are arranged in the second layer; The gangue conveyor belt (14) and the raw coal conveyor belt (16) are arranged in the first layer; The components are connected sequentially via chutes, allowing materials to flow between floors by gravity or mechanical power, forming a complete processing flow.

2. The integrated high-efficiency raw coal preparation and processing system according to claim 1, characterized in that, In the fourth layer, a chute leading to the raw coal washing belt (13) of the second layer is provided on the east side of the graded under-screen scraper (9), forming a bypass channel that allows the -80mm or -50mm under-screen material to directly enter the washing belt without going through the third layer of de-pulverization treatment.

3. The integrable high-efficiency raw coal preparation and processing system according to claim 1, characterized in that, An adjustable coal quantity gate is installed at the eastern end of the intermediate scraper (11) of the de-pulverizing screen, which is used to selectively distribute 10-3mm granular coal to the second layer of the raw coal washing belt (13) or the first layer of the final raw coal belt (16).

4. The integrated high-efficiency raw coal preparation and processing system according to claim 1, characterized in that, The raw coal through-type crusher (3) located on the sixth floor is equipped with a sliding track so that it can be moved to the side in case of failure, and is equipped with a corresponding bypass chute so that the raw coal can fall directly to the main shaft to the raw coal bunker B belt (4) on the fifth floor.

5. The integrated high-efficiency raw coal preparation and processing system according to claim 1, characterized in that, The 80mm or 50mm raw coal grading screen (7), the TDS intelligent dry separator (8), the raw coal crusher (12), and the 10 / 3mm double-layer de-pulverizing screen (10) are all arranged symmetrically in pairs to form two parallel and independently operating processing systems.

6. A method for preparing and processing raw coal using the system described in any one of claims 1 to 5, characterized in that, Includes the following steps: Material lifting and pretreatment steps: The raw coal underground is transported to the sixth layer via the main shaft to the raw coal bunker A belt (1), and is then removed from iron by the iron remover (2) and crushed to -250mm by the raw coal through crusher (3). It is then transported to the raw coal bunker via the main shaft to the raw coal bunker B belt (4). Material return and grading steps: Raw coal is returned to the preparation workshop via the conveyor belt (5) and then to the fifth layer. It is fed into the 80mm or 50mm raw coal grading screen (7) on the fourth layer by the raw coal distribution screen scraper (6) for grading to obtain the oversize and undersize materials. Intelligent sorting and crushing steps: The material on the screen is fed into the TDS intelligent dry separator (8) to separate gangue and raw coal, wherein the raw coal and / or gangue are crushed by the raw coal crusher (12); De-pulverization and path selection steps: The undersize material is fed into the third layer of the 10 / 3mm double-layer de-pulverization screen (10) by the graded undersize scraper (9) for de-pulverization. The obtained 80-10mm material enters the raw coal washing belt (13). The 10-3mm material is adjusted and distributed to the raw coal washing belt (13) or the fine raw coal belt (16) by the intermediate scraper (11) of the de-pulverization screen. The -3mm material is fed into the fine raw coal belt (16) by the pulverized coal scraper (15) of the de-pulverization screen. Product output steps: raw coal is conveyed by the raw coal washing belt (13), gangue is conveyed by the gangue belt (14), and fine coal product is conveyed by the fine raw coal belt (16).

7. The raw coal preparation and processing method according to claim 6, characterized in that, It also includes a full-wash mode: after the grading step, the undersize material of -80mm or -50mm is directly fed into the raw coal washing belt (13) of the second layer through the bypass chute on the east side of the grading undersize scraper (9), bypassing the de-pulverization treatment of the third layer.

8. The raw coal preparation and processing method according to claim 6, characterized in that, In the material lifting and pretreatment step, if the raw coal through crusher (3) malfunctions, it is removed so that the raw coal falls directly to the main shaft to the raw coal bunker B belt (4) through the bypass chute, thus maintaining the continuity of raw coal transportation.

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