CN114950716B - Coarse and refined coal classification and crushing equipment setting scheme in main re-selection system of dense medium cyclone - Google Patents
Coarse and refined coal classification and crushing equipment setting scheme in main re-selection system of dense medium cyclone Download PDFInfo
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- B03B9/00—General arrangement of separating plant, e.g. flow sheets
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Abstract
The invention discloses a coarse clean coal classification and crushing equipment setting scheme in a heavy medium cyclone main re-selection system, wherein the front section of a coarse clean coal medium-removing sieve for dehydrating and removing medium of coarse clean coal obtained by sorting the coarse clean coal by the heavy medium cyclone is a medium-removing sieve plate section, the rear section of the coarse clean coal medium-removing sieve is a classifying sieve plate section, and the medium-removing and classifying functions of the coarse clean coal medium-removing sieve can be set by replacing classifying sieve plates with different sieve gaps; a pre-screen forking chute with a turnover guide plate is adopted to connect a coarse clean coal medium-removing screen with a coarse clean coal crusher and a coarse clean coal transferring scraper conveyor, and the direction of the material on the screen is changed by arranging the direction of the turnover guide plate; the undersize chute with the turning plate is used for connecting the coarse clean coal medium removal sieve and the fine selection mixing bucket, and the flow direction of undersize materials or mediums is changed by setting the direction of the turning plate; by adopting the setting scheme of the coarse clean coal classifying and crushing equipment provided by the invention, the product structure of the coal preparation system can be set, so that not only can the power coal be produced, but also the coking coal can be produced, and the quality and recovery rate of the coking coal can be ensured.
Description
Technical Field
The invention relates to a device setting scheme in a heavy medium cyclone main recleaning system, in particular to a coarse clean coal grading and crushing device setting scheme in a heavy medium cyclone main recleaning system for washing and selecting refractory coal with raw coal gangue continuously generated and clean coal difficult to dissociate.
Background
Coking coal and fat coal which can be used as main coking coal in coal resources in China belong to scarce variety coal resources. In the coke production, the proportion of coking coal blending such as gas coal is reasonably improved, the consumption of main coking coal can be saved, scarce coal resources can be saved, and the coke production cost can be reduced to a certain extent. In recent years, low-ash coking coal blending such as gas clean coal is paid attention to in coke production, the market demand of the low-ash coking coal blending in China is vigorous, the price is far higher than that of common power coal, and the price advantage is obvious. Therefore, the coal preparation plant adds a coking and coal blending recleaning process in the dynamic coal washing and sorting process, and the coking and coal blending is refined from the dynamic coal, so that the economic benefit of enterprises can be improved. The actual conditions of raw coal production of coal mines of coal washery matched with production mines have great influence change. If the ash content exceeds the standard when the roof and the bottom plate are constructed and cut; the adhesive index is low when the moving face is inverted or the single face is produced; the clean coal is hard and is difficult to be dissociated from the continuous bodies when the coal gangue is continuously produced, and the clean coal is difficult to be washed and selected. Therefore, the coal preparation production system matched with the mine can adapt to the coal quality change of raw coal produced by the mine, can flexibly adjust the product structure according to the market and the raw coal property, and can produce both a power coal supply power plant and a coking coal blending supply coking plant. The production system can further dissociate raw coal with harder coal quality and continuous production of gangue, so that the recovery rate of clean coal is improved, coal resources can be fully and high-quality utilized, and economic benefit can be improved. The main recleaning coal preparation process adopting the two-product heavy medium cyclone comprises a waste rock discharging process of a first-stage heavy medium main separation system and a second-stage heavy medium fine separation process. When gangue is discharged and the mixed coal product is taken as power coal, the second stage of fine selection can not be opened; when the low-gray-level clean coal products are washed and selected as coking and blending coal, the main reselection can be completely started. However, when the coking coal blending product is washed and selected from refractory coal which is produced by continuous production of coal gangue and is difficult to be dissociated by clean coal, the coarse clean coal which is mainly selected from the first section of dense medium is required to be crushed and dissociated further and then enters the second section of dense medium cyclone, so that the quality and the recovery rate of the clean coal can be improved. Therefore, the coarse clean coal classification and crushing process is added in the main re-separation coal preparation process of the heavy medium cyclone, and therefore, the reasonable setting scheme of coarse clean coal classification and crushing equipment is very important to be determined in the main re-separation coal preparation system of the heavy medium cyclone.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides a coarse clean coal classification and crushing equipment setting scheme in a heavy medium cyclone main reselection system, which can meet the requirements that the heavy medium cyclone main reselection system can flexibly adjust the product structure according to the properties of raw coal, and can produce power coal and coking coal blending; but also can meet the requirement of good recovery rate of clean coal when washing the refractory coal which is continuously produced and is difficult to be dissociated.
In order to solve the problems, the invention provides a coarse and refined coal classification and crushing equipment setting scheme in a heavy medium cyclone main reselection system:
the main recleaning system of the dense medium cyclone comprises a main screening system and a recleaning system; the main separation system comprises a coarse dense medium cyclone, a gangue medium removal sieve, a coarse clean coal medium removal sieve and a coarse clean coal transfer scraper conveyor; the coarse dense medium cyclone is a two-product dense medium cyclone, and raw coal enters the coarse dense medium cyclone after being deslimed by a desliming screen and is separated into gangue and coarse clean coal; the gangue medium removal sieve and the coarse clean coal medium removal sieve dehydrate and remove medium from the gangue and the coarse clean coal to obtain gangue products and coarse clean coal products; the coarse clean coal products on the coarse clean coal medium-removing screen fall to the coarse clean coal transfer scraper conveyor; the secondary concentrating system comprises a coarse clean coal crusher, a concentrating dense medium cyclone and a concentrating mixing barrel; the coarse clean coal crusher further crushes and dissociates the coarse clean coal; the fine-separation dense-medium cyclone is a two-product dense-medium cyclone, the coarse clean coal after crushing and dissociation is separated into medium clean coal and low-ash clean coal, and the medium clean coal and the low-ash clean coal are subjected to medium removal and dehydration to obtain a medium clean coal product and a low-ash clean coal product; the coarse clean coal obtained through the dehydration and medium removal of the coarse clean coal medium removal sieve enters the coarse clean coal crusher, and discharged materials of the coarse clean coal crusher and undersize materials of the coarse clean coal medium removal sieve are led into the carefully chosen mixing bucket; the setting scheme of the coarse clean coal medium removal sieve, the coarse clean coal crusher, the carefully chosen mixing bucket and the coarse clean coal transfer scraper conveyor is as follows:
the fine selection mixing barrel is arranged on the ground of a washing workshop, a mounting platform is arranged above the fine selection mixing barrel, the coarse clean coal medium removing sieve, the coarse clean coal crusher and the coarse clean coal transfer scraper conveyor are arranged on the mounting platform, the coarse clean coal transfer scraper conveyor is arranged in front of the coarse clean coal medium removing sieve, the coarse clean coal crusher is arranged in front of the coarse clean coal transfer scraper conveyor, and the coarse clean coal medium removing sieve is higher than the coarse clean coal crusher and the coarse clean coal transfer scraper conveyor;
the front section of the coarse clean coal medium-removing sieve is a medium-removing sieve plate section, and the rear section of the coarse clean coal medium-removing sieve is a grading sieve plate section;
a qualified medium funnel and a dilute medium funnel are arranged below the medium removing sieve plate of the medium removing sieve plate section of the coarse clean coal medium removing sieve, and the qualified medium funnel is communicated with a coarse-separation qualified medium barrel; the lean medium funnel is arranged in front of the qualified medium funnel, and is communicated with the rough separation lean medium barrel;
an undersize chute is arranged below the sieve plate of the grading sieve plate section of the coarse clean coal medium removal sieve, and is communicated with the carefully chosen mixing barrel; the rear side of the upper section of the undersize chute is provided with a through hole communicated with the front end of the dilute medium funnel, the inside of the upper section of the undersize chute is provided with a turning plate, the turning plate is rotatably connected with the undersize chute, the turning plate is turned backwards to a proper position to block the through hole, and the turning plate is turned forwards to a proper position to block the undersize chute;
a pre-screen forking chute is arranged in front of the coarse clean coal medium-removing screen, two discharge holes are arranged below the pre-screen forking chute and are respectively connected with the feed inlet of the coarse clean coal crusher and the end part of the coarse clean coal transfer scraper conveyor, and the upper opening of the pre-screen forking chute is connected with the upper discharge hole of the coarse clean coal medium-removing screen; the inside of the pre-screen forking chute is provided with a turnover guide plate at the forking position, the turnover guide plate is rotatably connected with the pre-screen forking chute, and the turnover guide plate respectively blocks the passages of materials, the coarse clean coal crusher and the coarse clean coal transfer scraper conveyor at two limit positions;
a discharge chute is arranged at a discharge port of the coarse clean coal crusher, and the discharge chute is communicated with the carefully-selected mixing barrel;
when the power coal is washed, only the main separation system is started, the classifying screen plate section of the coarse clean coal medium removal screen is provided with a medium removal screen plate, the overturning guide plate in the pre-screen bifurcation chute overturns forwards to block a channel leading to the coarse clean coal crusher, and the overturning plate in the undersize chute overturns forwards to cut off the undersize chute;
when washing and selecting low-ash coking coal blending, the main selection system and the secondary selection system are started, and the main selection system is connected in series with the secondary selection system; the classifying screen plate section of the coarse clean coal medium removal screen is provided with a classifying screen plate, the overturning guide plate in the front-screen forking chute overturns backwards to block a channel leading to the coarse clean coal transfer scraper conveyor, and the turning plate in the under-screen chute overturns backwards to block the through hole.
According to the embodiment of the invention, specifically, raw coal which is pretreated into 50-0mm granularity is subjected to desliming treatment through the wet desliming system, 50-0mm raw coal is subjected to wet desliming through the desliming screen with the size of 1.0mm, and oversize materials with the size of 50-1.0mm enter the main separation system.
When the power coal is washed, only the main selection system is started, the classifying screen plate section of the coarse clean coal medium removal screen is provided with medium removal screen plates, the screen gap of the medium removal screen plates is 1.0mm, the overturning guide plates in the pre-screen bifurcation chute are overturned forwards to block the channel leading to the coarse clean coal crusher, and the turning plates in the undersize chute are overturned forwards to cut off the undersize chute in place, so that the undersize chute is communicated with the dilute medium hopper;
by adopting the technical scheme, 50-1.0mm of materials are separated into gangue and coarse clean coal through the coarse separation dense medium cyclone, the gangue is subjected to medium removal to obtain gangue products, the coarse clean coal is subjected to medium removal through the coarse clean coal medium removal sieve to be dehydrated, the coarse clean coal products are obtained after medium removal, and the coarse clean coal products are dredged to the coarse clean coal transfer scraper conveyor through the pre-sieve branching chute and then are conveyed to the coarse clean coal product storage place. At this time, only qualified medium and lean medium are below the coarse and clean coal medium removal sieve, and the qualified medium and the lean medium are respectively discharged to the coarse and clean qualified medium barrel and the coarse and lean medium barrel through the qualified medium funnel and the lean medium funnel.
When washing and selecting low-ash coking coal blending, the main selection system and the secondary selection system are started, the classifying screen plate section of the coarse clean coal medium removal screen is replaced by the classifying screen plate, the length of the classifying screen plate section is 1200mm, and the screen gap of the classifying screen plate is 25mm; the turning guide plate in the pre-screen forked chute turns backwards to block a channel which is communicated with the coarse clean coal transferring scraper conveyor, a channel which is communicated with a feed inlet of the coarse clean coal crusher is opened, the turning plate in the undersize chute turns backwards to block the through hole, and a channel between the undersize chute and the carefully selected mixing barrel is opened. The coarse clean coal crusher is a double-toothed roller crusher, the feeding granularity of the double-toothed roller crusher is 50-25mm, and the discharging granularity is 25-0mm.
By adopting the technical scheme, the coarse clean coal medium removal sieve has the functions of dehydration and medium removal and classification, the front section of the coarse clean coal medium removal sieve is used for dehydration and medium removal, the rear section of the coarse clean coal medium removal sieve is used for classification, and after classification, the granularity of coarse clean coal on the sieve is 50-25mm, and the granularity of coarse clean coal under the sieve is 25-0mm; coarse clean coal with the screen size of 50-25mm is guided into the coarse clean coal crusher by the pre-screen forking chute to be crushed and dissociated, and the coarse clean coal is crushed into materials with the granularity of 25-0mm and is discharged into the fine selection mixing barrel; discharging undersize coarse refined coal with the granularity of 25-0mm into the carefully chosen mixing bucket through the undersize chute; at this time, the qualified medium and the lean medium under the screen of the coarse and clean coal medium removal screen are respectively discharged to the coarse and clean qualified medium barrel and the coarse and lean medium barrel through the qualified medium hopper and the lean medium hopper.
In summary, the scheme for setting coarse and refined coal classification and crushing equipment in the main re-separation system of the dense medium cyclone provided by the invention comprises the scheme for setting equipment parameters and the scheme for setting the flow direction of materials in the re-separation system, namely the coarse and refined coal medium removal sieve, the coarse and refined coal crusher, the carefully-selected mixing bucket, the coarse and refined coal transfer scraper conveyor and the connecting chute; the method realizes the starting and gangue discharging of the main separation system, and can wash and separate the power coal; the main separation system and the secondary separation system are started simultaneously to jointly wash and separate the low-gray coking coal blending, so that the aim of flexibly adjusting the structure of the product according to the properties of raw coal is fulfilled; the coarse clean coal is classified, crushed and dissociated before entering the dense medium cyclone, so that the quality and recovery rate of clean coal are improved during coking and coal blending production. Only the classifying screen plates of the rear section of the coarse clean coal medium removal screen are required to be provided as screen plates with different screen slits, for example, the screen slits are 25mm or 1.0mm; the product structure can be adjusted by arranging different directions for the overturning guide plate in the pre-screen forked chute and the turning plate in the undersize chute.
Drawings
The invention is described in further detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a flow chart of the main recleaning coal preparation system of the heavy medium cyclone according to the embodiment of the invention;
FIG. 2 is a schematic diagram of the arrangement of main separation system equipment and coarse and refined coal classification and crushing equipment of the coal separation system shown in FIG. 1;
FIG. 3 is a left side view of FIG. 2;
fig. 4 is a schematic diagram of the arrangement of coarse and fine coal classifying and crushing equipment in the coal preparation system shown in fig. 2.
Reference numerals:
100. a wet desliming system; 200. a dense medium sorting system; 201. a main selection system; 202. selecting the system again; 300. a slime water treatment system; p400 and mounting platform
W1, raw coal; w2, gangue; w3, coarse clean coal; w4, middlings; w5, clean coal; w6, gangue products; w7, middlings; w8, refined coal products;
1. a desliming screen; 2. a mixing barrel; 3. a coal slime water bucket; 4. coarse separation dense medium cyclone; 5. removing medium from gangue; 6. coarse clean coal medium removing sieve; 7. roughing a qualified medium barrel; 8. rough separation of thin medium barrels; 9. a rough concentration magnetic separator; 10. a coarse clean coal crusher; 11. selecting a mixing barrel; 12. carefully selecting a dense medium cyclone; 13. medium coal removing sieve; 14. fine coal medium removing sieve; 15. a middling centrifugal dehydrator; 16. a clean coal centrifugal dehydrator; 17. carefully selecting a qualified medium barrel; 18. carefully selecting a thin medium barrel; 19. selecting a first magnetic separator; 20. selecting a second magnetic separator; 30. a clean water tank; 31. a circulating water tank; 32. coarse clean coal transshipment scraper conveyor;
61. sieving an under-sieve chute; 62. a dilute medium funnel; 63. a qualified medium hopper; 64. a forked chute before screening; 65. a discharge chute; 66. a medium-removing sieve plate section; 67. a classifying screen plate section; 611. turning plate; 6110. a turning plate operating device; 641. turning over the material guide plate; 6410. and a guide plate operating device.
Detailed Description
The following detailed description of embodiments of the invention, and further illustrating the invention, is exemplary and is not to be construed as limiting the invention by way of example only.
The following describes in detail the coarse and fine coal classification and crushing equipment setting scheme in the dense medium cyclone main re-selection system according to the embodiment of the invention with reference to fig. 1 to 4.
In the following, the composition and process flow chart of the main re-coal separation system of the heavy medium cyclone, which are mentioned in the invention, are described in detail with reference to fig. 1, for convenience of reading and description, the names of equipment and materials involved in the coal separation production process of the invention are marked in fig. 1, and text description is reserved, and the main coal flow line, the clean water line, the circulating water line, the qualified medium line, the dilute medium line, the slime water line, the gangue line and the magnetic separation tailing line in the coal separation production process are drawn by different lines, and are marked in the lower right corner of fig. 1.
As can be seen from fig. 1, the heavy medium cyclone main recleaning coal preparation system of the present invention comprises a wet desliming system 100, a heavy medium separation system 200, and a slime water treatment system 300; the wet desliming system 100 adopts a desliming screen 1 to desliming raw coal W1, desliming coal enters a mixing bucket 2, and coal slime enters a coal slime bucket 3; the slime water treatment system 300 performs separation and slime concentration treatment on the slime under the screen 1 of the wet desliming system 100 and the magnetic separation tailings generated in the heavy medium separation system 200, and the slime water treatment system 300 is not the core of the present invention and is not described in detail herein;
the apparatus of the production system shown in fig. 1 further comprises a clean water tank 30 for storing clean water and a circulating water tank 31, wherein the clean water tank 30 provides clean water for the circulating water tank 31 as additional water; the circulating water tank 31 is also connected with the desliming screen 1, the gangue medium-removing screen 5, the coarse clean coal medium-removing screen 6, the roughing qualified medium barrel 7, the medium coal medium-removing screen 13, the carefully-selected qualified medium barrel 17 and the clean coal medium-removing screen 14 and is supplied with water, and the detailed description is omitted.
The core part of the heavy medium cyclone main recleaning coal preparation system is a heavy medium separation system 200, and the heavy medium separation system 200 comprises a main separation system 201 and a recleaning system 202; the main separation system 201 comprises a desliming screen 1, a coarse dense medium cyclone 4, a gangue desliming screen 5, a coarse clean coal desliming screen 6 and a coarse clean coal transfer scraper conveyor 32; the coarse dense medium cyclone 4 is a two-product dense medium cyclone, and raw coal W1 enters the coarse dense medium cyclone 4 after desliming by a desliming screen 1 and is separated into gangue W2 and coarse clean coal W3; the gangue medium removing sieve 5 and the coarse clean coal medium removing sieve 6 respectively dehydrate and remove medium from the gangue W2 and the coarse clean coal W3 to obtain a gangue product W6 and a coarse clean coal product; the coarse clean coal products on the coarse clean coal medium removal screen 6 screen fall to a coarse clean coal transfer scraper conveyor 32; the recleaning system 202 comprises a coarse clean coal crusher 10, a recleaning heavy medium cyclone 12 and a recleaning mixing bucket 11; the coarse clean coal crusher 10 further crushes and dissociates coarse clean coal W3; the dense medium cyclone 12 is a dense medium cyclone of two products, the coarse clean coal after crushing and dissociation is separated into medium coal W4 and low-gray clean coal W5, the medium coal W4 is subjected to medium removal through a medium coal medium removal sieve 13, the medium coal is dehydrated by a medium coal centrifugal dehydrator 15 to obtain a medium coal product W7, the low-gray clean coal W5 is subjected to medium removal through a clean coal medium removal sieve 14, and the clean coal is dehydrated by a clean coal centrifugal dehydrator 16 to obtain clean coal W8, and the clean coal W8 with low gray; the coarse clean coal W3 obtained through the dehydration and the medium removal of the coarse clean coal medium removal sieve 6 enters a coarse clean coal crusher 10, and the discharged materials of the coarse clean coal crusher 10 and the undersize materials of the coarse clean coal medium removal sieve 6 are led into a fine selection mixing bucket 11.
Fig. 2 and 3 are schematic diagrams of arrangement of equipment of a main separation system and coarse and refined coal classification and crushing equipment of the coal separation system shown in fig. 1; in order to better observe the arrangement relation of coarse and refined coal classification and crushing equipment, the coarse and refined coal crusher 10, the fine dense medium cyclone 12, the fine mixing bucket 11, the coarse and refined coal transfer scraper conveyor 32 and other equipment and the arrangement relation thereof are independently drawn as shown in fig. 4. The following is a further explanation of the arrangement and setting scheme of the coarse clean coal medium removal sieve 6, the coarse clean coal crusher 10, the fine selection mixing bucket 11, and the coarse clean coal transfer scraper conveyor 32 with reference to fig. 2, 3, and 4, and is as follows:
as shown in fig. 2 and 3, a beneficiation mixing drum 11 is arranged on the ground of a washery, a mounting platform P400 is arranged above the beneficiation mixing drum 11, a coarse clean coal medium removal sieve 6, a coarse clean coal crusher 10 and a coarse clean coal transfer scraper conveyor 32 are arranged on the mounting platform P400, the coarse clean coal transfer scraper conveyor 32 is arranged in front of the coarse clean coal medium removal sieve 6, the coarse clean coal crusher 10 is arranged in front of the coarse clean coal transfer scraper conveyor 32, and the coarse clean coal medium removal sieve 6 is higher than the coarse clean coal crusher 10 and the coarse clean coal transfer scraper conveyor 32;
as shown in fig. 2 and 4, the front section of the coarse clean coal medium removal sieve 6 is a medium removal sieve plate section 66, and the rear section of the coarse clean coal medium removal sieve 6 is a classification sieve plate section 67; a qualified medium funnel 63 and a dilute medium funnel 62 are arranged below a medium removing sieve plate 661 of the medium removing sieve plate section 66 of the coarse clean coal medium removing sieve 6, and the qualified medium funnel 63 is communicated with the coarse clean qualified medium barrel 7; the lean medium funnel 62 is arranged in front of the qualified medium funnel 63, and the lean medium funnel 62 is communicated with the rough concentration lean medium barrel 8; an undersize chute 61 is arranged below a sieve plate of the classifying sieve plate section 67 of the coarse clean coal medium removal sieve 6, and the undersize chute 61 is communicated with the fine selection mixing bucket 11; the rear side of the upper section of the undersize chute 61 is provided with a through hole communicated with the front end of the dilute medium hopper 62, the inside of the upper section of the undersize chute 61 is provided with a turning plate 611, the turning plate 611 is rotatably connected with the undersize chute 61, the turning plate 611 is turned backwards to a position to block the through hole, and the turning plate 611 is turned forwards to a position to block the undersize chute 61;
as shown in fig. 2 and 4, a pre-screen forking chute 64 is arranged in front of the coarse clean coal medium removing screen 6, two discharge ports are arranged below the pre-screen forking chute 64 and are respectively connected with the feed port of the coarse clean coal crusher 10 and the end part of the coarse clean coal transferring scraper conveyor 32, and the upper port of the pre-screen forking chute 64 is connected with the upper discharge port of the coarse clean coal medium removing screen 6; the inside of the pre-screen forking chute 64 is provided with a turnover guide plate 641 at the forking position, the turnover guide plate 641 is rotatably connected with the pre-screen forking chute 64, and the turnover guide plate 641 respectively blocks the passages of the materials, the coarse clean coal crusher 10 and the coarse clean coal transfer scraper conveyor 32 at two limit positions;
further in accordance with an embodiment of the present invention, as shown in fig. 4, a guide plate handling device 6410 is provided outside the pre-screen bifurcation chute 64, the guide plate handling device 6410 being connected to the rotating shaft of the flip guide plate 641 and driving the flip of the flip guide plate 641; a turning plate operating device 6110 is arranged outside the under-screen chute 61, and the turning plate operating device 6110 is connected with a rotating shaft of the turning plate 611 and drives the turning plate 611 to turn.
As shown in fig. 2, 3 and 4, a discharge chute 65 is arranged at a discharge port of the coarse clean coal breaker 10, and the discharge chute 65 is communicated with a fine selection mixing bucket 11;
when the power coal is washed, only the main separation system 201 is started, the classifying screen plate section 67 of the coarse clean coal screening sieve 6 is provided with a screening screen plate, the overturning guide plate 641 in the pre-sieve forking chute 64 overturns forwards to block the passage leading to the coarse clean coal crusher 10, and the overturning plate 611 in the undersize chute 61 overturns forwards to stop the undersize chute 61 in place;
when washing and selecting low-ash coking coal blending, the main selection system 201 and the secondary selection system 202 are started, and the main selection system 201 is connected in series with the secondary selection system 202; the classifying screen plate section 67 of the coarse clean coal removing screen 6 is provided with a classifying screen plate, the overturning guide plate 641 in the front-screen forking chute 64 overturns backwards to block the passage leading to the coarse clean coal transferring scraper conveyor 32, and the overturning plate 611 in the under-screen chute 61 overturns backwards to block the through hole.
Specifically, with reference to the system composition of the embodiment of the present invention shown in fig. 1 and the schematic arrangement of the apparatus shown in fig. 2 to 4, raw coal W1 pretreated to have a particle size of 50-0mm is subjected to desliming treatment by the wet desliming system 100, raw coal W1 having a particle size of 50-0mm is subjected to wet desliming by the 1.0mm desliming screen 1, and oversize material having a particle size of 50-1.0mm is fed into the main separation system 201.
When the power coal is washed, the main selection system 201 is started, a classifying screen plate section 67 of the coarse clean coal separating screen 6 is provided with a separating screen plate, the screen gap of the separating screen plate is 1.0mm, a turnover guide plate 641 in a pre-screen forking chute 64 is turned forward to block a channel leading to the coarse clean coal crusher 10, a turnover plate 611 in an undersize chute 61 is turned forward to a position to cut off the undersize chute 61, and the undersize chute 61 is communicated with a dilute medium hopper 62;
by adopting the technical scheme, 50-1.0mm of materials are separated into waste rock W2 and coarse clean coal W3 through the coarse separation dense medium cyclone 4, waste rock W2 is subjected to medium removal to obtain waste rock product W6, coarse clean coal W3 is subjected to dehydration and medium removal through the coarse clean coal medium removal sieve 6 to obtain coarse clean coal product, and the coarse clean coal product is dredged to the coarse clean coal transfer scraper conveyor 32 through the pre-sieve branching chute 64 and is further conveyed to the storage place of the coarse clean coal product. At this time, only qualified medium and lean medium are arranged under the coarse and clean coal medium removing screen 6, and the qualified medium and the lean medium are respectively discharged to the coarse and clean medium barrel 7 and the coarse and lean medium barrel 8 through the qualified medium hopper 63 and the lean medium hopper 62. The medium in the rough concentration medium barrel 8 is processed by a rough concentration magnetic separator 9 to obtain qualified medium, and the qualified medium is discharged into a rough concentration qualified medium barrel 7.
When washing and selecting low-ash coking coal blending, the main selection system 201 and the secondary selection system 202 are started, the classifying screen plate section 67 of the coarse clean coal medium removal screen 6 is replaced by the classifying screen plate, the classifying screen plate section 67 is 1200mm long, and the screen gap of the classifying screen plate is 25mm; the turning guide plate 641 in the pre-screen forked chute 64 turns backwards to block the passage to the coarse clean coal transferring scraper conveyor 32, opens the passage to the feed inlet of the coarse clean coal breaker 10, turns backwards to block the through opening in place of the turning plate 611 in the undersize chute 61, and opens the passage between the undersize chute 61 and the beneficiation mixer bowl 11. The coarse clean coal crusher 10 is a double-toothed roller crusher, the feeding granularity of the double-toothed roller crusher is 50-25mm, and the discharging granularity is 25-0mm.
By adopting the technical scheme, the coarse clean coal medium-removing sieve 6 has the functions of dehydration and medium-removing and classification, the front section of the coarse clean coal medium-removing sieve 6 is used for dehydration and medium-removing, the rear section is used for classification, after classification, the granularity of coarse clean coal on the sieve is 50-25mm, and the granularity of coarse clean coal under the sieve is 25-0mm; coarse clean coal with the granularity of 50-25mm on the screen is guided into a coarse clean coal crusher 10 by a pre-screen bifurcation chute 64 to be crushed and dissociated, and the coarse clean coal is crushed into materials with the granularity of 25-0mm and is discharged into a fine selection mixing bucket 11; the undersize coarse refined coal with the granularity of 25-0mm is discharged into a carefully chosen mixing bucket 11 through an undersize chute 61; at this time, the qualified medium and the diluted medium under the screen of the coarse and refined coal medium removal screen 6 are respectively discharged to the coarse and refined qualified medium barrel 7 and the coarse and refined medium barrel 8 through the qualified medium funnel 63 and the diluted medium funnel 62, and after further magnetic separation, the obtained qualified medium is recycled, and the obtained tailings enter the slime water treatment system 300 for further treatment.
Referring to fig. 1, coarse cleaned coal with granularity of 25-0mm entering a cleaning mixing drum 11 enters a re-cleaning system 202 for cleaning, a medium coal W4 and a cleaned coal W5 are obtained through cleaning by a cleaning dense medium cyclone 12, the medium coal W4 is subjected to medium removal by a medium coal medium removal sieve 13 and dehydration by a medium coal centrifugal dehydrator 15 to obtain a medium coal product W7, the low-gray cleaned coal W5 is subjected to medium removal by a medium coal medium removal sieve 14 and dehydration by a cleaned coal centrifugal dehydrator 16 to obtain a cleaned coal product W8, and the low-gray cleaned coal product W8 is used as a low-gray coking coal blending product. The medium is removed by the medium removing sieve 13, the medium is removed by the clean coal removing sieve 14 of the medium centrifugal dehydrator 15, the qualified medium removed by the clean coal centrifugal dehydrator 16 enters the fine-selection qualified medium barrel 17, the removed dilute medium enters the fine-selection dilute medium barrel 18, the medium in the fine-selection dilute medium barrel 18 passes through the fine-selection magnetic separator, the removed qualified medium enters the fine-selection qualified medium barrel 17, the tailings enter the slime water barrel 3, and then enter the slime water treatment system 300 for treatment. According to the actual requirement of the production system, one concentrating magnetic separator is sometimes used, a plurality of concentrating magnetic separators are sometimes used, and 2 concentrating magnetic separators are used in the coal dressing system shown in fig. 1 and are respectively marked as a first concentrating magnetic separator 19 and a second concentrating magnetic separator 20.
In summary, the coarse and refined coal classification and crushing equipment setting scheme in the main re-selection system of the dense medium cyclone provided by the invention not only comprises the arrangement scheme of coarse and refined coal medium removal sieve 6, coarse and refined coal crusher 10, fine mixing bucket 11, coarse and refined coal transfer scraper conveyor 32 and connecting chute, equipment parameter setting scheme (such as setting sieve plates with different sieve gap sizes), but also comprises the arrangement scheme of material flow direction in the re-selection system 202 (such as setting the direction of a turning plate 611 in a sieve lower chute 61); the main separation system 201 is started to discharge gangue, and the power coal can be washed and separated; the main selection system 201 and the secondary selection system 202 are started simultaneously to jointly wash and select low-gray coking coal blending, so that the aim of flexibly adjusting the product structure according to the properties of raw coal is fulfilled; the coarse clean coal is classified, crushed and dissociated before entering the dense medium cyclone 12, so that the quality and recovery rate of clean coal are improved during the production of coking and blending coal. Only the classifying screen plates of the rear section of the coarse clean coal removing screen 6 need to be provided as screen plates with different screen slits, for example, the screen slits are 25mm or 1.0mm; the product structure can be adjusted by providing different directions for the turning guide plate 641 in the pre-screen fork chute 64 and the turning plate 611 in the undersize chute 61.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (4)
1. The utility model provides a heavy medium swirler owner reselects system which characterized in that:
the main recleaning system of the dense medium cyclone comprises a main screening system and a recleaning system;
the main separation system comprises a coarse dense medium cyclone, a gangue medium removal sieve, a coarse clean coal medium removal sieve and a coarse clean coal transfer scraper conveyor; raw coal enters the coarse dense medium cyclone after desliming by a desliming screen and is separated into gangue and coarse clean coal; the gangue medium removal sieve and the coarse clean coal medium removal sieve dehydrate and remove medium from the gangue and the coarse clean coal to obtain gangue products and coarse clean coal products; the coarse clean coal products on the coarse clean coal medium-removing screen fall to the coarse clean coal transfer scraper conveyor;
the secondary concentrating system comprises a coarse clean coal crusher, a concentrating dense medium cyclone and a concentrating mixing barrel; the coarse clean coal crusher further crushes and dissociates the coarse clean coal; the coarse clean coal after crushing and dissociation is separated into medium coal and low ash clean coal by the dense medium cyclone separator, and medium coal products and low ash clean coal products are obtained after medium removal and dehydration of the medium coal and the low ash clean coal;
the coarse clean coal obtained through the dehydration and medium removal of the coarse clean coal medium removal sieve enters the coarse clean coal crusher, and discharged materials of the coarse clean coal crusher and undersize materials of the coarse clean coal medium removal sieve are led into the carefully chosen mixing bucket; the arrangement and the setting scheme of the coarse clean coal medium-removing screen, the coarse clean coal crusher, the carefully chosen mixing bucket and the coarse clean coal transfer scraper conveyor are as follows:
the fine selection mixing barrel is arranged on the ground of a washing workshop, a mounting platform is arranged above the fine selection mixing barrel, the coarse clean coal medium removing sieve, the coarse clean coal crusher and the coarse clean coal transfer scraper conveyor are arranged on the mounting platform, the coarse clean coal transfer scraper conveyor is arranged in front of the coarse clean coal medium removing sieve, the coarse clean coal crusher is arranged in front of the coarse clean coal transfer scraper conveyor, and the coarse clean coal medium removing sieve is higher than the coarse clean coal crusher and the coarse clean coal transfer scraper conveyor;
the front section of the coarse clean coal medium-removing sieve is a medium-removing sieve plate section, and the rear section of the coarse clean coal medium-removing sieve is a grading sieve plate section;
a qualified medium funnel and a dilute medium funnel are arranged below the medium removing sieve plate of the medium removing sieve plate section of the coarse clean coal medium removing sieve, and the qualified medium funnel is communicated with a coarse-separation qualified medium barrel; the lean medium funnel is arranged in front of the qualified medium funnel, and is communicated with the rough separation lean medium barrel;
an undersize chute is arranged below the sieve plate of the grading sieve plate section of the coarse clean coal medium removal sieve, and is communicated with the carefully chosen mixing barrel; the rear side of the upper section of the undersize chute is provided with a through hole communicated with the front end of the dilute medium funnel, the inside of the upper section of the undersize chute is provided with a turning plate, the turning plate is rotatably connected with the undersize chute, the turning plate is turned backwards to a proper position to block the through hole, and the turning plate is turned forwards to a proper position to block the undersize chute;
a pre-screen forking chute is arranged in front of the coarse clean coal medium-removing screen, two discharge holes are arranged below the pre-screen forking chute and are respectively connected with the feed inlet of the coarse clean coal crusher and the end part of the coarse clean coal transfer scraper conveyor, and the upper opening of the pre-screen forking chute is connected with the upper discharge hole of the coarse clean coal medium-removing screen; the inside of the pre-screen forking chute is provided with a turnover guide plate at the forking position, the turnover guide plate is rotatably connected with the pre-screen forking chute, and the turnover guide plate respectively blocks the passages of materials, the coarse clean coal crusher and the coarse clean coal transfer scraper conveyor at two limit positions;
a discharge chute is arranged at a discharge port of the coarse clean coal crusher, and the discharge chute is communicated with the carefully-selected mixing barrel;
when the power coal is washed, only the main separation system is started, the classifying screen plate section of the coarse clean coal medium removal screen is provided with a medium removal screen plate, the overturning guide plate in the pre-screen bifurcation chute overturns forwards to block a channel leading to the coarse clean coal crusher, and the overturning plate in the undersize chute overturns forwards to cut off the undersize chute;
when washing and selecting low-ash coking coal blending, the main selection system and the secondary selection system are started, and the main selection system is connected in series with the secondary selection system; the classifying screen plate section of the coarse clean coal medium removal screen is provided with a classifying screen plate, the overturning guide plate in the front-screen forking chute overturns backwards to block a channel leading to the coarse clean coal transfer scraper conveyor, and the turning plate in the under-screen chute overturns backwards to block the through hole.
2. The dense-medium cyclone main reselection system according to claim 1, wherein:
the granularity of the raw coal is 50-0mm;
the screen slot of the screen plate of the desliming screen is 1.0mm;
the screen gap of the medium-removing screen plate arranged on the coarse clean coal medium-removing screen is 1.0mm;
the length of the classifying screen plate section of the coarse clean coal medium removal screen is 1200 mm; when washing and selecting low-ash coking coal blending, the screen gap of the grading screen plate of the coarse clean coal medium removal screen is 25 mm.
3. The dense-medium cyclone main reselection system according to claim 1, wherein:
the coarse clean coal crusher is a double-toothed roller crusher, the feeding granularity of the double-toothed roller crusher is 50-25mm, and the discharging granularity is 25-0mm.
4. The dense-medium cyclone main reselection system according to claim 1, wherein:
the coarse dense medium cyclone is a two-product dense medium cyclone, and the fine dense medium cyclone is a two-product dense medium cyclone.
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