CN114700169A - Separation process suitable for treating fine-grain hard-dressing coking coal with high middling coal content - Google Patents
Separation process suitable for treating fine-grain hard-dressing coking coal with high middling coal content Download PDFInfo
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- CN114700169A CN114700169A CN202210047216.8A CN202210047216A CN114700169A CN 114700169 A CN114700169 A CN 114700169A CN 202210047216 A CN202210047216 A CN 202210047216A CN 114700169 A CN114700169 A CN 114700169A
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- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
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Abstract
The application provides a fine-grained hard coking coal separation process suitable for treating medium coal content, and belongs to the technical field of fine-grained coking coal separation. The separation process of the fine-grained hard-separation coking coal with high middling coal content comprises the following separation steps: s1, separating the coking coal by the medium gangue magnetic tail through a grading cyclone; s2, inputting the clean coal into a grading cyclone through a clean coal magnetic tail to realize separation treatment on the coking coal; s3, adopting a 'one-rough-scanning' procedure by a flotation roughing system; by adopting the two-stage three-product flotation process, the quality of flotation clean coal and tailing coal is ensured, and meanwhile, the full recovery of useful components is achieved; the fine particle grade of the medium gangue magnetic tail enters a flotation scavenging link, so that the full recovery of the medium coal is ensured, and the pollution of clean coal products is avoided; the method can be well adapted to coal quality fluctuation of a selected factory, namely a TBS underflow coal leakage product is finally fed into a middling product, and the recovery is maximized.
Description
Technical Field
The application relates to the technical field of fine coking coal separation, in particular to a fine difficult-to-separate coking coal separation process suitable for treating medium coal with high content.
Background
With the large-scale transportation of mechanized mining and the large-area spreading application of the dense-medium coal separation technology, the phenomenon of high content of fine-grained coal slime in selected raw coal is brought. Meanwhile, the phenomenon that coking coal is often accompanied by high-content middlings brings about the problem that the content of middlings in fine-grained coal slime is generally higher in a coking coal-dressing process, and the proportion of fine-grained refractory coking coal is increased day by day. The increasing scarcity of reserves of high-quality coking coal types (such as gas coal and fat coal) caused by the mass exploitation of coal resources puts an urgent requirement on the sufficient and efficient recovery of refractory coking coal.
The fine-grained coal slime sources in the coking coal preparation plant are mainly medium gangue magnetic tailings and clean coal magnetic tailings, flotation is the most effective method for recovering the fine-grained coal slime at present, and the common methods in the conventional coking coal process comprise the following steps: 1) after grading, feeding the fine fraction in the middle gangue magnetic tail and the fine fraction in the clean coal magnetic tail into a flotation system, wherein flotation products are flotation clean coal and flotation tail coal slime; 2) after grading, the fine fraction in the clean coal magnetic tail enters a flotation system, flotation products are flotation clean coal and flotation tail coal slime, and the fine fraction in the medium gangue magnetic tail is mixed with the flotation tail coal slime. In the two processes, in order to ensure the quality requirement of the flotation clean coal, the ash content of the tail coal slime product is low, the recovery of the coal product in the coking coal is insufficient, and the flotation clean coal is polluted by more high-ash fine mud in the coal product, so that the product quality is reduced.
The key for realizing the full recovery of the fine-grained refractory coking coal with high medium coal content is the solution of the pollution problem of high-ash fine mud and the optimization of the structure of a flotation product. Based on the method, the fine-grained coal slime recovery process based on the emphasis of slurry dispersion and two-stage flotation optimization of the flotation product structure has important significance for efficient separation and recovery of fine-grained difficult-to-separate coking coal with high coal content.
Disclosure of Invention
In order to make up for the defects, the application provides a fine-grained refractory coking coal separation process suitable for treating high-middlings, and the fine-grained refractory coking coal separation process is based on pre-selection forced pulp mixing and two-stage three-product flotation and mainly aims to solve the problem of maximum recovery of fine-grained refractory coking coal with high-middlings.
The embodiment of the application provides a separation process of fine-grained refractory coking coal with high middling coal content, which comprises a middling magnetic tail and a refined gangue magnetic tail;
the output end of the medium gangue magnetic tail is connected with a medium gangue magnetic tail grading cyclone, one output end of the medium gangue magnetic tail grading cyclone is connected with a high-frequency sieve, one output end of the high-frequency sieve is connected with a coarse medium coal slime centrifuge, and one output end of the coarse medium coal slime centrifuge outputs medium coal;
the output end of the fine gangue magnetic tail is connected with a fine coal magnetic tail grading cyclone, one output end of the fine coal magnetic tail grading cyclone is connected with a TBS (tunnel boring machine) sorter, one output end of the TBS sorter is connected with the high-frequency dewatering screen, the other output end of the TBS sorter is connected with a stacked screen, one output end of the stacked screen is connected with a coarse and fine coal slime centrifugal machine, and the other output end of the coarse and fine coal slime centrifugal machine outputs fine coal;
the coarse and fine coal slime centrifuge the hierarchical swirler of clean coal magnetism tail and the equal output of the other end of folding sieve connect first accent pulp grinder, the output of first accent pulp grinder is connected with first flotation machine, an output of first flotation machine is connected with the clean coal pressure filter, clean coal is exported to an output of clean coal pressure filter, another output circulating water of clean coal pressure filter, another output of first flotation machine is connected with second accent pulp grinder, the output of second accent pulp grinder is connected with the second flotation machine, the hierarchical swirler of well cash magnetism tail the high frequency sieve, another output of coarse and medium coal slime centrifuge all connects the pulp grinder is emphasized to the second, an output of second flotation machine is connected with the middling pressure filter, an output of middling pressure filter exports the middling, another output of second flotation machine is connected with concentrated pond, an output of concentrated pond is connected with the tail coal pressure filter, the coal slime is exported to an output of tail coal pressure filter, the middlings pressure filter the tail coal pressure filter with the circulating water is all exported to another output of concentrated pond.
In a particular embodiment, the following sorting steps are included:
s1, separating coking coal by the medium gangue magnetic tail through a grading cyclone, fully separating coarse coking coal particles from coal slime, dewatering the coarse coking coal particles through a high-frequency dewatering screen, centrifuging the coarse coking coal particles through a coal slime centrifuge to obtain a medium coal product, and outputting fine fractions and coal slime separated by the coal slime centrifuge, the grading cyclone and the high-frequency dewatering screen;
s2, inputting the clean coal into a grading cyclone through a clean coal magnetic tail to realize separation treatment on the coking coal, conveying coarse particles of the coking coal into a TBS (moving bed conveyor) separator for separation again, conveying heavy products into a high-frequency dewatering screen for dewatering and a coal slurry centrifuge for centrifugal treatment to obtain a middling coal product, treating light products through a stacking screen for dewatering and the coal slurry centrifuge to obtain fine-grained clean coal products, and outputting the fine-grained light products and the coal slurry obtained by the grading cyclone, the stacking screen and the coal slurry centrifuge;
s3, a flotation roughing system adopts a 'roughing sweeping' process, a pulp slurry emphasizing technology is adopted before selection, fine particle grades and coal slime in light products obtained by a classification cyclone, a stacking sieve and a coal slime centrifugal machine in the S2 are output to an emphasizing pulp machine, the coal slime is fully dispersed, high-ash fine mud on the surface of the coal particles is stripped, and the pollution of clean coal is reduced; dewatering the flotation roughing cleaned coal by a filter press to obtain a cleaned coal product, and inputting the flotation roughing tailings into a flotation machine again through an emphasis pulp grinder to perform a scavenging link; the flotation scavenging feed material is the coarse tailings from the previous flotation and the fine fraction and the coal slime separated by the coal slime centrifugal machine, the grading cyclone and the high-frequency dewatering screen in S1, the clean coal obtained from the flotation scavenging is processed by a filter press to obtain a middling product, and the flotation scavenging tailings are dehydrated by a concentration tank and the filter press to obtain a tailing coal slime product.
In a specific embodiment, the S1 and S2 are suitable for sorting and recovering fine-grained refractory coking coal with high medium-coal content.
In the implementation process, the separation and recovery of the fine-grained refractory coking coal with high middling content are realized.
In a specific embodiment, a flotation middling recovery process is arranged in the step S3, middling components in coal slurry are recovered as much as possible to achieve maximum recycling of valuable components, fine fraction components in the magnetic tail classification dehydration process of middling gangue enter a flotation scavenging process, valuable components are recovered in a middling recovery mode to the maximum extent, and pollution of high-ash fine mud components to flotation clean coal is avoided.
In the implementation process, the separation process provided by the invention has the advantages of simple flow, low investment, low operation cost and obvious economic benefit, and can effectively improve the utilization rate of resources and reduce the consumption.
In a specific embodiment, the middle gangue magnetic tail in the S feeds coking coal into a middle gangue magnetic tail classification cyclone for classification, coarse fraction materials flow into the inside of a high-frequency sieve through a middle gangue magnetic tail classification cyclone underflow pipeline at the lower end of the middle gangue magnetic tail classification cyclone for dehydration and fine fraction removal, the high-frequency sieve screens and then inputs upper-layer products into a coarse and medium coal slime centrifuge for dehydration through a high-frequency sieve oversize product pipeline, the coarse and medium coal slime centrifuge screens and then outputs the screened products through a coarse and medium coal slime centrifuge product pipeline to obtain medium coal products, the high-frequency sieve discharges the screened materials through a high-frequency sieve undersize product pipeline, the coarse and medium coal slime centrifuge discharges the centrifuged materials through a coarse and medium coal slime centrifuge centrifugate pipeline, and the upper-layer materials of the middle gangue magnetic tail classification cyclone are discharged through a middle gangue magnetic tail classification cyclone overflow pipeline, and the product pipeline under the high-frequency sieve and the centrifugal liquid pipeline of the coarse medium coal slime centrifuge converge the overflow pipeline of the medium gangue magnetic tail classifying cyclone to input the product at the separation part into a flotation scavenging system.
In the implementation process, the fine particles of the medium gangue magnetic tail enter a flotation scavenging link, so that the full recovery of the medium coal is ensured, and the pollution of the medium gangue magnetic tail to the flotation clean coal product by the medium-ash fine mud and the intergrowth is avoided.
In a specific embodiment, the clean coal magnetic tail feeds coking coal into a clean coal magnetic tail classification cyclone for classification, a coarse fraction material separated by the clean coal magnetic tail classification cyclone is input into the TBS separator along with a clean coal magnetic tail classification cyclone underflow pipeline for classification, a heavy product in the TBS separator is converged and conveyed into the high-frequency sieve along with a TBS separator underflow pipeline and a medium gangue magnetic tail classification cyclone underflow pipeline for dehydration and fine fraction removal, a light product in the TBS separator is input into a stacked sieve along with a TBS separator overflow pipeline for dehydration and fine fraction removal, a stacked sieve oversize product pipeline of the stacked sieve conveys an upper-layer material separated by the sieve to a coarse fine coal slime centrifuge for dehydration treatment, and a product obtained by centrifugation in the coarse fine coal centrifuge is discharged through a coarse fine coal slime centrifuge centrifugal product pipeline to obtain a clean coal product, and the discharge of a product pipeline under the stacked screen of the stacked screen, the discharge of a coarse and fine coal slurry centrifugal machine through a centrifugal liquid pipeline of the coarse and fine coal slurry centrifugal machine and the discharge of an overflow pipeline of a fine coal magnetic tail grading cyclone of the fine coal magnetic tail are converged and then input into a flotation and coarse separation sweeping system.
In the implementation process, the fluctuation of the coal quality of a selected plant can be well adapted, when the coal quality is poor, the content of the medium coal in the feed material of the TBS separator is high, in order to ensure the quality of clean coal, part of the coal slime enters the underflow of the TBS separator to cause the coal leakage phenomenon, and the process can ensure that the coarse fraction of the coal slime is dehydrated into medium coal products and the fine fraction of the coal slime is floated and scavenged to recover the medium coal products, namely the underflow coal leakage products of the TBS separator finally enter the medium coal products, thereby realizing the maximum recovery of useful components.
In a specific embodiment, the supplied materials of flotation roughing system do clean coal magnetic tail classification swirler overflow pipeline coarse clean coal mud centrifuge centrifugate pipeline reaches fold sieve undersize product pipeline, extract the ore pulp through first emphasis pulp machine promptly, first emphasis pulp machine is inputed the ore pulp to first flotation built-in through the pulp of entering after intensive mixing and is carried out the flotation roughing with the ore pulp pipeline, first flotation machine is inputed the clean coal of flotation department to clean coal filter press built-in through the flotation roughing clean coal pipeline and is carried out the filter-pressing dehydration, clean coal filter press passes through clean coal filter-pressing dehydration product pipeline output clean coal product. The first flotation machine inputs separated substances into a second emphatic pulp machine for emphatic pulp treatment through a flotation roughing tailing pipeline and a high-frequency screening undersize product pipeline, the second emphatic pulp machine inputs pulp into the second emphatic pulp machine through an emphatic pulp grading swirler overflow pipeline for emphatic pulp treatment, the second emphatic pulp machine inputs the pulp into the second flotation machine for scavenging through an emphatic pulp pipeline for middling pulp, the second flotation machine inputs middling coal into a middling filter press for filter pressing and dehydration through a flotation scavenging clean coal pipeline, the middling filter press outputs obtained middling coal products through a middling coal filter pressing and dehydration pipeline, the second flotation machine inputs floated tailing into a concentration machine for filter pressing and dehydration through a flotation scavenging tailing pipeline, the concentration machine inputs concentrated substances into the tailing filter press for dehydration through a tailing thickener underflow pipeline, and the tail coal filter press is used for removing the coal slime product discharged by the aquatic product pipeline through tail coal filter pressing.
In the implementation process, a two-stage three-product flotation process is adopted, the product structure is optimized, and the quality of flotation clean coal and tailing coal products is ensured, and meanwhile, the full recovery of useful components is achieved.
In a specific embodiment, still including the circulating water pond in the flotation roughing system, the circulating water pond is with clean coal filter-pressing filtrating pipeline, middlings filter-pressing filtrating pipeline, tail coal thickener overflow pipe and the fixed intercommunication of tail coal filter-pressing filtrating pipeline, the circulating water pond receives and comes from clean coal filter-pressing filtrating pipeline the middlings filter-pressing filtrating pipeline the tail coal thickener overflow pipe with the waste water of tail coal filter-pressing filtrating pipeline emission.
In the implementation process, the sewage is recycled, a large amount of consumption of the sewage in the process is effectively reduced, the cyclic utilization is realized, and the pollution of water resources can be reduced.
In a specific embodiment, the process is used for producing three products, namely a clean coal product, a middlings product and a coal slime product, wherein the clean coal product is a substance discharged from a coarse clean coal slime centrifugal machine centrifugal product pipeline and a clean coal filter-pressing dewatering product pipeline, the middlings product is a substance discharged from the coarse clean coal slime centrifugal machine centrifugal product pipeline and a middlings filter-pressing dewatering product pipeline, and the coal slime product is a substance obtained by a flotation scavenging tail coal pipeline.
In the implementation process, the clean coal product, the middlings product and the coal slime product in the coking coal can be respectively output, so that the coking coal is fully sorted, and the utilization rate of the coking coal is improved.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow diagram of a sorting process of the present invention;
FIG. 2 is a schematic diagram of the apparatus of the sorting process of the present invention.
In the figure: 1-medium gangue magnetic tail, 2-medium gangue magnetic tail classifying swirler underflow pipe, 3-medium gangue magnetic tail classifying swirler overflow pipe, 4-high frequency screen oversize product pipe, 5-high frequency screen undersize product pipe, 6-coarse medium coal slime centrifuge centrifugate pipe, 7-coarse medium coal slime centrifuge centrifugate product pipe, 8-fine coal magnetic tail, 9-fine coal magnetic tail classifying swirler underflow pipe, 10-fine coal magnetic tail classifying swirler overflow pipe, 11-TBS classifier overflow pipe, 12-TBS classifier underflow pipe, 13-stacked screen oversize product pipe, 14-stacked screen undersize product pipe, 15-coarse fine coal slime centrifuge centrifugate product pipe, 16-coarse fine coal slime centrifuge centrifugate pipe, 17-floating ore pulp pipeline after strong pulp mixing, 18-flotation coarse coal cleaning pipeline, 19-a flotation roughing tailing pipeline, 20-a clean coal filter-pressing aquatic product removal pipeline, 21-a clean coal filter-pressing filtrate pipeline, 22-a middle coal pulp pipeline after strong size mixing, 23-a flotation scavenging clean coal pipeline, 24-a flotation scavenging tailing pipeline, 25-a middle coal filter-pressing aquatic product removal pipeline, 26-a middle coal filter-pressing filtrate pipeline, 27-a tailing thickener overflow pipeline, 28-a tailing thickener underflow pipeline, 29-a tailing coal filter-pressing aquatic product removal pipeline, 30-a tailing filter-pressing filtrate pipeline, 31-a middle coal product, 32-a clean coal product, 33-a middle gangue magnetic tail classification cyclone, 34-a high-frequency sieve, 35-a coarse middle coal slime centrifuge, 36-a clean coal magnetic tail classification, 37-a TBS separator, 38-a stacked sieve, 39-a coarse clean coal slime centrifuge, 40-first undersize pulp machine, 41-first flotation machine, 42-clean coal filter press, 43-second undersize pulp machine, 44-second flotation machine, 45-middlings filter press, 46-thickener, 47-tailings filter press, 48-circulating water tank.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1-2, the present application provides a fine-grained refractory coking coal separation process suitable for processing high-content middlings, comprising a middlings magnetic tail 1 and a fine gangue magnetic tail 8;
the output end of the medium gangue magnetic tail 1 is connected with a medium gangue magnetic tail grading cyclone 33, one output end of the medium gangue magnetic tail grading cyclone 33 is connected with a high-frequency screen 34, one output end of the high-frequency screen 34 is connected with a coarse medium coal slime centrifuge 35, and one output end of the coarse medium coal slime centrifuge 35 outputs medium coal;
the output end of the fine gangue magnetic tail 8 is connected with a fine coal magnetic tail grading cyclone 36, one output end of the fine coal magnetic tail grading cyclone 36 is connected with a TBS (thermal transfer radical) separator 37, one output end of the TBS separator 37 is connected with the high-frequency dewatering screen 34, the other output end of the TBS separator 37 is connected with a stacked screen 38, one output end of the stacked screen 38 is connected with a coarse and fine coal slime centrifuge 39, and the other output end of the coarse and fine coal slime centrifuge 39 outputs fine coal;
coarse and fine coal slime centrifuge 39 the hierarchical swirler 36 of cleaned coal magnetic tail and the pile of equal output of the other end of sieve 38 connects first accentuating pulp machine 40, the output of first accentuating pulp machine 40 is connected with first flotation machine 41, an output of first flotation machine 41 is connected with cleaned coal pressure filter 42, cleaned coal is exported to an output of cleaned coal pressure filter 42, another output circulating water of cleaned coal pressure filter 42, another output of first flotation machine 41 is connected with second accentuating pulp machine 43, the output of second accentuating pulp machine 43 is connected with second flotation machine 44, the hierarchical swirler 33 of well cash magnetic tail, high frequency sieve 34 another output of coarse and medium coal slime centrifuge 35 all connects the pulp machine 43 is emphasized to the second, an output of second flotation machine 44 is connected with medium coal pressure filter 45, middlings are output by one output end of the middlings filter press 45, another output end of the second flotation machine 44 is connected with a concentration tank 46, an output end of the concentration tank 46 is connected with a tailing coal filter press 47, coal slime is output by one output end of the tailing coal filter press 47, the middlings filter press 45, the tailing coal filter press 47 and circulating water is output by the other output end of the concentration tank 46.
In specific implementation, the method comprises the following sorting steps:
s1, separating coking coal by the medium gangue magnetic tail 1 through a grading cyclone, fully separating coarse coking coal particles from coal slime, dewatering the coarse coking coal particles through a high-frequency dewatering screen, centrifuging the coarse coking coal particles through a coal slime centrifuge to obtain a medium coal product 31, and outputting fine fractions and coal slime separated by the coal slime centrifuge, the grading cyclone and the high-frequency dewatering screen;
s2, inputting the clean coal into a grading cyclone through the clean coal magnetic tail 8 to realize separation treatment of the coking coal, separating coarse particles of the coking coal again by conveying the coarse particles into a TBS separator 37, conveying heavy products into a high-frequency dewatering screen to dewater and centrifuging a coal slurry centrifuge to obtain a medium coal product 31, treating light products by a stacking screen dewatering and a coal slurry centrifuge to obtain a fine-grained clean coal product 32, and outputting the fine-grained light products and the coal slurry obtained by the grading cyclone, the stacking screen and the coal slurry centrifuge;
s3, a flotation roughing system adopts a 'roughing sweeping' process, a pulp slurry emphasizing technology is adopted before selection, fine particle grades and coal slime in light products obtained by a classification cyclone, a stack sieve 38 and a coal slime centrifugal machine in the S2 are output to an emphasizing pulp machine, the coal slime is fully dispersed, high-ash fine mud on the surface of coal particles is stripped, and the pollution of clean coal is reduced; dewatering the flotation roughing cleaned coal by a filter press to obtain a cleaned coal product 32, and inputting the flotation roughing tailings into a flotation machine again through an emphasis pulp grinder to perform a scavenging link; the flotation scavenging feed material is the coarse tailings from the previous flotation and the fine fraction and the coal slime separated by the coal slime centrifugal machine, the grading cyclone and the high-frequency dewatering screen in S1, the cleaned coal obtained from the flotation scavenging is processed by the filter press to obtain the middling coal product 31, and the flotation scavenging tailings are dehydrated by the concentration tank 46 and the filter press to obtain the tailing coal slime product.
In specific implementation, the S1 and the S2 are suitable for sorting and recycling fine-grain hard-sorting coking coal with high middling coal content, and sorting and recycling of the fine-grain hard-sorting coking coal with high middling coal content are realized.
In specific implementation, a flotation middling coal recycling process is arranged in S3, middling coal components in coal slime are recycled as much as possible, the maximum recycling of valuable components is achieved, fine-fraction components in a middling gangue magnetic tail grading dehydration process enter a flotation scavenging process, the valuable components are recycled in a middling coal recycling mode to the maximum, and pollution of the high-ash fine mud components to flotation clean coal is avoided.
In specific implementation, the middling magnetic tail 1 in the S1 feeds coking coal into a middling magnetic tail classifying cyclone 33 for classification, coarse-grained materials flow into the inside of a high-frequency sieve 34 through a underflow pipe 2 of the middling magnetic tail classifying cyclone at the lower end of the middling magnetic tail classifying cyclone 33 for dehydration and fine grain classification, the upper-layer products are input into a coarse-medium coal slime centrifuge 35 for dehydration through an upper-layer product pipe 4 of the high-frequency sieve 34 after being sieved, the coarse-medium coal slime centrifuge 35 outputs a middling coal product 31 through a centrifugal product pipe 7 of the coarse-medium coal slime centrifuge after being sieved, the sieved materials are discharged through a lower-layer product pipe 5 of the high-frequency sieve by the high-frequency sieve 34, the centrifuged materials are discharged through a centrifugal liquid pipe 6 of the coarse-medium coal slime centrifuge 35, the upper-layer materials of the middling magnetic tail classifying cyclone 33 are discharged through an overflow pipe 3 of the middling magnetic tail classifying cyclone, the overflow pipeline 3 of the gangue magnetic tail grading cyclone in the confluence of the product pipeline 5 under the high-frequency sieve and the centrifugal liquid pipeline 6 of the coarse medium coal slime centrifuge inputs the product at the separation part into a flotation scavenging system, and the fine grain grade of the medium gangue magnetic tail enters a flotation scavenging link, so that the full recovery of medium coal is ensured, and the pollution of the medium-high ash fine slime and intergrowth in the medium gangue magnetic tail to a flotation clean coal product is avoided.
In the concrete implementation, the cleaned coal magnetic tail 8 feeds coking coal into a cleaned coal magnetic tail grading cyclone 36 for grading, the coarse fraction material sorted by the cleaned coal magnetic tail grading cyclone 36 is input into a TBS sorter 37 along with a cleaned coal magnetic tail grading cyclone underflow pipe 9 for sorting, the heavy product in the TBS sorter 37 is converged and conveyed into a high-frequency screen 34 along with a TBS sorter underflow pipe 12 and a medium magnetic tail grading cyclone underflow pipe 2 for dewatering and fine fraction removal, the light product in the TBS sorter 37 is input into a stacked screen 38 along with a TBS sorter overflow pipe 11 for dewatering and fine fraction removal, the stacked screen oversize product pipe 13 of the stacked screen 38 conveys the screened upper layer material into a coarse fine coal slime centrifuge 39 for dewatering treatment, the product obtained by centrifugation in the coarse fine coal centrifuge 39 is discharged through a coarse fine coal slime centrifugal product pipe 15 to obtain a cleaned coal product 32, the stacked screen undersize product pipe 14 of the stacked screen 38, the discharged material of the stacked screen undersize product pipe 14, The discharge of the coarse refined coal slime centrifuge 39 through the coarse refined coal slime centrifuge centrifugate pipeline 16 and the discharge of the refined coal magnetic tail classifying cyclone overflow pipeline 10 of the refined coal magnetic tail 8 are converged and then input into a flotation scavenging roughing system, which can better adapt to the fluctuation of coal quality in a selected factory, when the coal quality is poor, the feed medium coal content of a TBS separator is high, in order to ensure the refined coal quality, part of coal slime enters the underflow of the TBS separator to cause coal leakage, and the process can ensure that the part of coal slime is dehydrated into medium coal products in coarse fraction and is scavenged and recycled into the medium coal products in fine fraction, namely the underflow coal leakage products of the TBS separator finally enter the medium coal products, thereby realizing the maximum recovery of useful components.
In specific implementation, the incoming materials of the flotation roughing system are a clean coal magnetic tail classification cyclone overflow pipeline 10, a rough clean coal slurry centrifuge centrifugate pipeline 16 and a superposed screen undersize product pipeline 14, that is, the first emphasis pulp machine 40 extracts ore pulp, the first emphasis pulp machine 40 inputs the ore pulp into a first flotation machine 41 for flotation roughing through a forced pulp mixing and then enters a floating ore pulp pipeline 17, the first flotation machine 41 inputs clean coal at the flotation position into a clean coal filter press 42 for filter pressing and dehydration through a flotation roughing clean coal pipeline 18, and the clean coal filter press 42 outputs a clean coal product 32 through a clean coal filter pressing and water removal pipeline 20. The first flotation machine 41 inputs the separated substances into a second emphatic pulp machine 43 for emphatic pulp treatment through a flotation roughing tailing pipeline 19, a high-frequency screen undersize product pipeline 5, a roughing middling coal mud centrifuge centrifugate pipeline 6 and a middling coal mud grading cyclone overflow pipeline 3, the second emphatic pulp machine 43 inputs the pulp into a second flotation machine 44 for scavenging through a middling coal pulp pipeline 22 after emphatic pulp regulation, the second flotation machine 44 inputs the middling coal into a middling coal filter press 45 for filter pressing dehydration through a flotation scavenging clean coal pipeline 23, the middling coal filter press 45 outputs the obtained middling coal product 31 through a middling coal filter pressing desorption pipeline 25, the second flotation machine 44 inputs the floated tailing coal into a thickener 46 for filter pressing dehydration through a flotation scavenging tailing pipeline 24, the thickener 46 inputs the concentrated substances into a tailing coal filter press 47 for dehydration through a tailing coal press pressing through a tailing underflow pipeline 28, the tail coal filter press 47 removes the product that the product pipeline 29 discharges through the tail coal filter pressing is the coal slime product, adopts two sections three-product flotation process, optimizes the product structure, when guaranteeing flotation clean coal, tail coal product quality, has reached the abundant recovery of useful component.
In specific implementation, the flotation roughing system further comprises a circulating water tank 48, the circulating water tank 48 is fixedly communicated with the clean coal filter-pressing filtrate pipeline 21, the middlings filter-pressing filtrate pipeline 26, the tail coal thickener overflow pipeline 27 and the tail coal filter-pressing filtrate pipeline 30, the circulating water tank 48 receives wastewater discharged from the clean coal filter-pressing filtrate pipeline 21, the middlings filter-pressing filtrate pipeline 26, the tail coal thickener overflow pipeline 27 and the tail coal filter-pressing filtrate pipeline 30, the sewage is recycled, a large amount of consumption of the sewage in the process is effectively reduced, recycling is achieved, and pollution of water resources can be reduced.
In specific implementation, the process is used for producing three products, namely a clean coal product 32, a middlings product 31 and a coal slime product, wherein the clean coal product 32 is discharged from a coarse clean coal slime centrifugal machine centrifugal product pipeline 15 and a clean coal filter-pressing dewatering product pipeline 20, the middlings product 31 is discharged from a coarse medium coal slime centrifugal machine centrifugal product pipeline 7 and a middlings filter-pressing dewatering product pipeline 25, and the coal slime product is obtained from a flotation scavenging tail coal pipeline 24.
Specifically, the separation process suitable for treating the fine-grained refractory coking coal with high medium coal content comprises the following steps:
firstly, separating coking coal by the medium gangue magnetic tail 1 through a grading cyclone, so that coarse coking coal particles can be fully separated from coal slime, dewatering the coarse coking coal particles through a high-frequency dewatering screen, centrifuging the coarse coking coal particles through a coal slime centrifuge to obtain a medium coal product 31, and outputting fine fractions and coal slime separated by the coal slime centrifuge, the grading cyclone and the high-frequency dewatering screen;
secondly, inputting the clean coal into a grading cyclone through a clean coal magnetic tail 8 to realize separation treatment on the coking coal, conveying coarse particles of the coking coal into a TBS (TBS) separator 37 for separation again, conveying heavy products into a high-frequency dewatering screen for dewatering and a coal slurry centrifuge for centrifugal treatment to obtain a medium coal product 31, conveying light products into a stacking screen for dewatering and a coal slurry centrifuge for treatment to obtain a fine-grained clean coal product 32, and outputting the fine-grained light products and the coal slurry obtained by the grading cyclone, the stacking screen and the coal slurry centrifuge;
thirdly, a flotation roughing system adopts a 'roughing sweeping' process, a pulp slurry emphasizing technology is adopted before selection, fine particle grades and coal slime in light products obtained by a classification cyclone, a stack sieve 38 and a coal slime centrifugal machine in S2 are output to an emphasizing pulp machine, the coal slime is fully dispersed, high-ash fine mud on the surface of coal particles is stripped, and clean coal pollution is reduced; dewatering the flotation roughing cleaned coal by a filter press to obtain a cleaned coal product 32, and inputting the flotation roughing tailings into a flotation machine again through an emphasis pulp grinder to perform a scavenging link; the flotation scavenging feed material is the coarse tailings from the previous flotation and the fine fraction and the coal slime separated by the coal slime centrifugal machine, the grading cyclone and the high-frequency dewatering screen in S1, the cleaned coal obtained from the flotation scavenging is processed by the filter press to obtain the middling coal product 31, and the flotation scavenging tailings are dehydrated by the concentration tank 46 and the filter press to obtain the tailing coal slime product.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A separation process suitable for processing fine-grained refractory coking coal with high middling coal content is characterized by comprising a middling magnetic tail (1) and a refined gangue magnetic tail (8);
the output end of the medium gangue magnetic tail (1) is connected with a medium gangue magnetic tail grading cyclone (33), one output end of the medium gangue magnetic tail grading cyclone (33) is connected with a high-frequency sieve (34), one output end of the high-frequency sieve (34) is connected with a coarse medium coal slime centrifuge (35), and one output end of the coarse medium coal slime centrifuge (35) outputs medium coal;
the output end of the fine gangue magnetic tail (8) is connected with a fine coal magnetic tail grading cyclone (36), one output end of the fine coal magnetic tail grading cyclone (36) is connected with a TBS (TBS) sorter (37), one output end of the TBS sorter (37) is connected with the high-frequency dewatering screen (34), the other output end of the TBS sorter (37) is connected with a stacked screen (38), one output end of the stacked screen (38) is connected with a coarse and fine coal slime centrifuge (39), and the other output end of the coarse and fine coal slime centrifuge (39) outputs fine coal;
coarse and fine coal slime centrifuge (39), clean coal magnetic tail classification swirler (36) and the other end of overlapping sieve (38) is all exported and is connected first emphasis pulp grinder (40), the output of first emphasis pulp grinder (40) is connected with first flotation machine (41), an output of first flotation machine (41) is connected with clean coal pressure filter (42), clean coal is exported to an output of clean coal pressure filter (42), another output of clean coal pressure filter (42) exports the circulating water, another output of first flotation machine (41) is connected with second emphasis pulp grinder (43), the output of second emphasis pulp grinder (43) is connected with second flotation machine (44), well waste rock magnetic tail classification swirler (33), high frequency sieve (34), another output of coarse and medium coal slime centrifuge (35) is all connected second emphasis pulp grinder (43), an output of second flotation machine (44) is connected with middlings pressure filter (45), an output middlings of middlings pressure filter (45), another output of second flotation machine (44) is connected with concentrated pond (46), an output of concentrated pond (46) is connected with tail coal pressure filter (47), the coal slime is exported to an output of tail coal pressure filter (47), middlings pressure filter (45) tail coal pressure filter (47) with the circulating water is all exported to another output of concentrated pond (46).
2. The process of claim 1, wherein the process comprises the following steps:
s1, separating coking coal by the medium gangue magnetic tail (1) through a grading cyclone, enabling coarse coking coal particles and coal slime to be sufficiently separated, dewatering the coarse coking coal particles through a high-frequency dewatering screen and centrifuging the coarse coking coal particles through a coal slime centrifuge to obtain a medium coal product (31), and outputting fine fractions and coal slime separated by the coal slime centrifuge, the grading cyclone and the high-frequency dewatering screen;
s2, inputting the clean coal into a grading cyclone through a clean coal magnetic tail (8) to realize separation treatment on the coking coal, conveying the coarse particles of the coking coal into a TBS (TBS) separator (37) for separation again, conveying the heavy product into a high-frequency dewatering screen for dewatering and a coal slurry centrifuge for centrifugal treatment to obtain a medium coal product (31), dewatering the light product through a stacking screen and processing the light product through the coal slurry centrifuge to obtain a fine-grained clean coal product (32), and outputting the fine-grained fine product and the coal slurry obtained by the grading cyclone, the stacking screen and the coal slurry centrifuge;
s3, a flotation roughing system adopts a 'roughing sweeping' process, a pulp slurry emphasizing technology is adopted before selection, fine fractions and coal slime in light products obtained by a classification cyclone, a stack sieve (38) and a coal slime centrifugal machine in S2 are output to the emphasizing slurry machine, the coal slime is fully dispersed, high-ash fine mud on the surface of coal particles is stripped, and the pollution of clean coal is reduced; dewatering the flotation roughing cleaned coal by a filter press to obtain a cleaned coal product (32), and inputting the flotation roughing tail coal into a flotation machine again through an emphasis pulp grinder to perform a scavenging link; the flotation scavenging feed material is the coarse tailings from the previous flotation and the fine fraction and the coal slime separated by the coal slime centrifugal machine, the grading cyclone and the high-frequency dewatering screen in S1, the middling product (31) is obtained from the clean coal obtained by flotation scavenging through the filter press, and the tailing coal slime product is obtained after the flotation scavenging is dehydrated through the concentration tank (46) and the filter press.
3. The separation process for the fine-grained refractory coking coal with high content of middlings suitable for processing the claim 2, wherein the S1 and S2 are suitable for the separation and recovery of the fine-grained refractory coking coal with high content of middlings.
4. The separation process of claim 2, wherein a flotation middling recovery step is provided in S3 to recover middling components in the coal slurry as much as possible to maximize recovery and utilization of valuable components, and fine fraction components in the magnetic tail classification dehydration step of middling gangue enter the flotation scavenging step to maximize recovery of valuable components in a middling recovery manner and avoid pollution of high ash fine mud components to flotation clean coal.
5. The separation process of the fine-grained hard-to-sort coking coal suitable for processing the high-middlings content is characterized in that the middlings magnetic tail (1) in the S1 feeds the coking coal into the middlings magnetic tail classifying cyclone (33) for classification, coarse-grained materials flow into the inside of the high-frequency screen (34) through the underflow pipe (2) of the middlings magnetic tail classifying cyclone at the lower end of the middlings magnetic tail classifying cyclone (33) for dehydration and fine grain removal, the products on the upper layer are input into the coarse middlings mud centrifuge (35) through the high-frequency screen oversize product pipe (4) for dehydration after the high-frequency screen (34) is screened, the middlings mud centrifuge (35) outputs the middlings product (31) through the coarse middlings mud centrifuge product pipe (7) after screening, the high-frequency screen (34) discharges the screened materials through the high-frequency undersize product pipe (5), the material after centrifugation is discharged through the thick medium coal slime centrifuge centrifugate pipeline (6) in thick medium coal slime centrifuge (35), the upper strata material of the hierarchical swirler of well waste rock magnetic tail (33) is discharged through the hierarchical swirler overflow pipe of well waste rock magnetic tail (3), product pipeline (5) under the high frequency sieve with thick medium coal slime centrifuge centrifugate pipeline (6) converge the product of the hierarchical swirler overflow pipe of well waste rock magnetic tail (3) with separation department is input to the flotation scavenging system.
6. The separation process of fine hard-dressing coking coal suitable for processing high-middlings content coal according to claim 5, characterized in that the magnetic tail (8) of clean coal feeds coking coal into the magnetic tail cyclone (36) of clean coal for classification, the coarse fraction material separated by the magnetic tail cyclone (36) of clean coal is fed into the TBS separator (37) along with the underflow pipe (9) of the magnetic tail cyclone of clean coal for classification, the heavy product in the TBS separator (37) is fed into the high-frequency sieve (34) along with the underflow pipe (12) of the TBS separator and the underflow pipe (2) of the magnetic tail cyclone of medium gangue for dehydration and fine fraction removal, the light product in the TBS separator (37) is fed into the stacked sieve (38) along with the overflow pipe (11) of the TBS separator for dehydration and fine fraction removal, and the product pipe (13) on the stacked sieve of the stacked sieve (38) delivers the upper layer material to the coarse fine fraction (39) for dehydration and fine fraction removal And (2) processing, discharging a product obtained by centrifugation in the coarse and fine coal slime centrifugal machine (39) through a coarse and fine coal slime centrifugal machine centrifugal product pipeline (15) to obtain a fine coal product (32), discharging the discharge of a screen stacking undersize product pipeline (14) of a screen stacking (38) from the coarse and fine coal slime centrifugal machine (39) through a coarse and fine coal slime centrifugal machine centrifugal liquid pipeline (16) and inputting the discharge of a fine coal magnetic tail grading cyclone overflow pipeline (10) of a fine coal magnetic tail (8) into a flotation and coarse separation system after converging.
7. The process of claim 6, which is suitable for processing fine-grained hard coking coal with high content of middlings, it is characterized in that the incoming materials of the flotation roughing system are the overflow pipeline (10) of the clean coal magnetic tail grading cyclone, the centrifugal liquid pipeline (16) of the coarse clean coal slime centrifugal machine and the superposed screen undersize product pipeline (14), namely, the pulp is extracted by a first emphatic pulp pump (40), the first emphatic pulp pump (40) inputs the pulp into a first flotation machine (41) for flotation roughing by an emphatic pulp inlet pipeline (17), the first flotation machine (41) inputs the clean coal at the flotation position into a clean coal filter press (42) for filter pressing and dehydration through a flotation roughing clean coal pipeline (18), and the clean coal filter press (42) outputs a clean coal product (32) through a clean coal filter press dehydration product pipeline (20).
8. The separation process of the fine-grained hard coking coal suitable for treating the high middlings content according to claim 7, wherein the first flotation machine (41) inputs the separated substances into a second emphatic pulp machine (43) for emphatic pulp treatment through a flotation roughing tailing coal pipeline (19), the high-frequency undersize product pipeline (5), the roughing middlings centrifuge centrifugate pipeline (6) and the middlings magnetic tail grading cyclone overflow pipeline (3), the second emphatic pulp machine (43) inputs pulp into a second flotation machine (44) for scavenging through a middlings pulp pipeline (22) after the pulp is emphatic, the second flotation machine (44) inputs middlings into a middlings filter press (45) for filter pressing and dewatering through a flotation scavenging clean coal pipeline (23), the middlings filter press (45) outputs the middlings product (31) through a middlings dewatering water product pipeline (25), the second flotation machine (44) inputs the floated tail coal into the thickener (46) through the flotation scavenging tail coal pipeline (24) for filter-pressing dehydration, the thickener (46) inputs the concentrated substances into the tail coal filter press (47) through the tail coal thickener underflow pipeline (28) for filter-pressing dehydration, and the tail coal filter press (47) discharges coal slime products through the tail coal filter-pressing dehydration product pipeline (29).
9. The separation process suitable for treating the fine-grained hard-to-separate coking coal with high middling coal content according to claim 8, wherein the flotation roughing system further comprises a circulating water tank (48), the circulating water tank (48) is fixedly communicated with a clean coal press-filtering filtrate pipeline (21), a middling press-filtering filtrate pipeline (26), a tail coal thickener overflow pipeline (27) and a tail coal press-filtering filtrate pipeline (30), and the circulating water tank (48) receives wastewater discharged from the clean coal press-filtering filtrate pipeline (21), the middling press-filtering filtrate pipeline (26), the tail coal thickener overflow pipeline (27) and the tail coal press-filtering filtrate pipeline (30).
10. The separation process of claim 9, wherein the process is used for producing three products, namely a clean coal product (32), a middlings product (31) and a coal slurry product, the clean coal product (32) is discharged from the coarse clean coal slurry centrifuge centrifugal product pipeline (15) and the clean coal filter-press dewatering product pipeline (20), the middlings product (31) is discharged from the coarse middlings centrifuge centrifugal product pipeline (7) and the middlings filter-press dewatering product pipeline (25), and the coal slurry product is discharged from the flotation separation tailing pipeline (24).
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