CN113600332A - Fine-grained refractory coking coal separation system with high medium coal content - Google Patents
Fine-grained refractory coking coal separation system with high medium coal content Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 227
- 238000004939 coking Methods 0.000 title claims abstract description 35
- 238000000926 separation method Methods 0.000 title claims description 27
- 238000005188 flotation Methods 0.000 claims abstract description 140
- 230000007246 mechanism Effects 0.000 claims abstract description 64
- 230000002000 scavenging effect Effects 0.000 claims abstract description 59
- 230000018044 dehydration Effects 0.000 claims abstract description 51
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 51
- 238000000034 method Methods 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 claims description 5
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 239000010419 fine particle Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000013055 pulp slurry Substances 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims description 2
- 239000010878 waste rock Substances 0.000 claims description 2
- 230000001944 accentuation Effects 0.000 claims 1
- 239000000047 product Substances 0.000 description 85
- 238000011084 recovery Methods 0.000 description 17
- 239000003250 coal slurry Substances 0.000 description 10
- 239000002002 slurry Substances 0.000 description 9
- 238000001914 filtration Methods 0.000 description 8
- 238000002156 mixing Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 239000000706 filtrate Substances 0.000 description 6
- 239000002562 thickening agent Substances 0.000 description 5
- 238000003825 pressing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000005119 centrifugation Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- 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
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
- B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal
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Abstract
The invention discloses a fine grain hard-dressing coking coal sorting system with high content of middlings, which comprises a middlings magnetic tail and a clean coal magnetic tail, wherein a grading dehydration centrifugal mechanism is arranged at a discharge end of the middlings magnetic tail; the discharge end of the cleaned coal magnetic tail is provided with a graded flotation scavenging mechanism, the heavy product discharge end of the graded flotation scavenging mechanism is communicated with the feed end of the medium coal bunker through a graded dehydration centrifugal mechanism, the light product discharge end of the graded flotation scavenging mechanism is communicated with the feed end of the cleaned coal bunker through a dehydration fine-grain-removal mechanism, and the fine-grain-removal discharge end of the dehydration fine-grain-removal mechanism is communicated with the coal slime bunker through the graded flotation scavenging mechanism.
Description
Technical Field
The invention belongs to the technical field of fine coking coal separation, and particularly relates to a fine refractory coking coal separation system with high medium coal content.
Background
At present, the invention relates to a fine-grained refractory coking coal separation technology based on pre-separation strong 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 medium coal content.
With the growing demand for high quality steel, the demand for coking coal supporting the steel industry is also growing. 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
The invention aims to solve the technical problem of providing a fine-grained refractory coking coal separation system with high middling coal content, which fundamentally solves the problem of insufficient recovery of fine-grained refractory coking coal with high middling coal content.
In order to achieve the purpose, the invention adopts the technical scheme that: the device comprises a medium gangue magnetic tail and a clean coal magnetic tail, wherein a graded dehydration centrifugal mechanism is arranged at the discharge end of the medium gangue magnetic tail, the coarse fraction discharge end of the graded dehydration centrifugal mechanism is communicated with a medium coal bin, and the fine fraction discharge end of the graded dehydration centrifugal mechanism is communicated with the feed end of a coal mud bin through a graded flotation scavenging mechanism of the clean coal magnetic tail; the discharge end of the cleaned coal magnetic tail is provided with a graded flotation scavenging mechanism, the heavy product discharge end of the graded flotation scavenging mechanism is communicated with the feed end of the medium coal bunker through a graded dehydration centrifugal mechanism, the light product discharge end of the graded flotation scavenging mechanism is communicated with the feed end of the cleaned coal bunker through a dehydration fine grain grade removing mechanism, and the fine grain discharge end of the dehydration fine grain grade removing mechanism is communicated with the coal slime bunker through the graded flotation scavenging mechanism.
The fine grain hard-separation coking coal separation system that medium coal content is high that this technical scheme provided, hierarchical dehydration centrifugation mechanism includes hierarchical swirler, high frequency dewatering screen and a coal slime centrifuge No. one, the discharge end of well waste rock magnetism tail is connected with the feed end of hierarchical swirler No. one, the coarse grain level discharge end of hierarchical swirler loop through high frequency dewatering screen and a coal slime centrifuge with the feed end intercommunication of well coal bunker, the fine grain level discharge end of hierarchical swirler, high frequency dewatering screen and a coal slime centrifuge divide equally do not with the feed end intercommunication of No. two accent pulp machines that hierarchical flotation scavenging mechanism has.
The technical scheme provides a fine-grained hard-separation coking coal separation system with high medium coal content, the classification flotation scavenging mechanism comprises a second classification cyclone, a TBS separator, a first emphasis slurry machine, a second emphasis slurry machine, a first flotation machine, a second flotation machine, a first filter press, a second filter press, a third filter press and a concentration tank, the discharge end of a magnetic tail of the refined coal is communicated with the feed end of the second classification cyclone, the coarse-grained discharge end of the second classification cyclone is communicated with the feed end of the TBS separator, the heavy product discharge end of the TBS separator is communicated with the feed end of a high-frequency dewatering screen of the classification dewatering centrifugal mechanism, the light product discharge end of the TBS separator is communicated with the feed end of the dewatering fine-grained removal mechanism, the second classification fine-grained discharge end of the first classification cyclone is communicated with the feed end of the first flotation machine through the first emphasis slurry machine, and the fine-grained discharge end of the first flotation machine is communicated with the refined coal bin, the coarse fraction discharge end of the first flotation machine is communicated with the feed end of the second flotation machine through a second emphasis pulp machine, the fine fraction discharge end of the second flotation machine is communicated with the feed end of a second filter press, the coarse fraction discharge end of the second filter press is communicated with the medium coal bunker, the coarse fraction discharge end of the second flotation machine is communicated with a third filter press through a concentration tank, and the coarse fraction discharge end of the third filter press is communicated with the coal slime bunker; the water outlet ends of the first filter press, the second filter press, the third filter press and the concentration tank are respectively communicated with circulating water.
The fine-grained hard-separation coking coal separation system with high medium coal content provided by the technical scheme is characterized in that the fine-grained mechanism for dewatering and fine-grained removal comprises a stacked sieve and a second coal slurry centrifuge, the light product discharge end of the TBS separator is communicated with the feed end of the stacked sieve, the coarse-grained discharge end of the stacked sieve is communicated with a refined coal bin through the coarse-grained discharge end of the second coal slurry centrifuge, and the fine-grained discharge ends of the stacked sieve and the second coal slurry centrifuge are communicated with the feed end of a first emphasis pulp grinder.
The technical proposal provides a fine-grained refractory coking coal separation system with high medium coal content,
the method comprises the following steps: the medium gangue magnetic tail is classified through the first classification cyclone, coarse fraction enters a medium coal product after dehydration, and fine fraction enters a classification flotation scavenging mechanism for a flotation scavenging link;
step two: the clean coal magnetic tail is classified through a second classification cyclone, the coarse fraction enters a TBS separator for separation, the heavy product is dehydrated and enters a medium coal bunker through a first emphasis pulp machine, a first flotation machine, a second emphasis pulp machine, a second flotation machine and a second filter press along with the coarse fraction of the medium gangue magnetic tail, the light product is dehydrated and enters a clean coal bunker after the fine fraction is removed through a dehydration and fine fraction removal mechanism, and the medium fine fraction of the light product overflows and enters a first emphasis pulp machine along with a second classification flow selector and enters a coal mud bunker after the fine fraction is subjected to flotation and roughing;
step three: a flotation roughing link and a flotation scavenging link adopt an ore pulp slurry enhancing technology before selection, so that 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 coarse flotation cleaned coal into a cleaned coal product, and performing flotation and coarse flotation tailing in a flotation scavenging link; the flotation scavenging feed is fine fraction in the flotation roughing tailing and middling magnetic tailing treatment process, the flotation scavenging clean coal is dehydrated into middling products, and the flotation scavenging tailing is dehydrated into tailing mud products.
By adopting the technical scheme, the system provides a separation process of strong pulp mixing and two-stage three-product flotation recovery before the fine-grained refractory coking coal with high middlings content, and realizes the high-efficiency separation and recovery of the fine-grained refractory coking coal with high middlings content, and in addition, the system has the following advantages: by adopting a two-stage three-product flotation process, 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; 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 the medium-ash fine mud and the intergrowth in the medium gangue magnetic tail to a flotation clean coal product is avoided; the process can ensure that part of the coal slime enters a middling product after coarse fraction dehydration and a fine fraction flotation scavenging to recover the middling product, namely the TBS underflow coal leakage product finally enters the middling product, thereby realizing the maximum recovery of useful components; the separation process provided by the invention has the advantages of simple flow, low investment, low operation cost and remarkably improved economic benefit.
The invention will be explained in more detail below with reference to the drawings and examples.
Drawings
The contents of the description and the references in the drawings are briefly described as follows:
FIG. 1 is a schematic process flow diagram of the system of the present invention;
FIG. 2 is a schematic diagram of the equipment associated with the sorting process of the present invention;
labeled as: 1. medium gangue magnetic tail, 2 medium gangue magnetic tail classifying swirler underflow, 3 medium gangue magnetic tail classifying swirler overflow, 4 high frequency sieve oversize product, 5 high frequency sieve undersize product, 6 coarse medium gangue centrifuge centrifugate, 7 coarse medium gangue centrifuge centrifugate product, 8 clean coal magnetic tail, 9 clean coal magnetic tail classifying swirler underflow, 10 clean coal magnetic tail classifying swirler overflow, 11 TBS sorter overflow, 12 TBS sorter underflow, 13 stacked sieve oversize product, 14 stacked sieve undersize product, 15 coarse clean coal slime centrifuge product, 16 coarse clean coal slime centrifuge centrifugate, 17 forced pulp mixing and floating pulp entering, 18 flotation coarse clean coal, 19 flotation coarse tail coal, 20 clean coal filter press filtration dehydration product, 21 clean coal filter press filtration filtrate, 22 pulp emphasizing pulp middle coal pulp, 23 flotation scavenging clean coal, 24 scavenging tail coal, 25. the system comprises a medium coal filter-press dehydration product, 26 a medium coal filter-press filtrate, 27 a tail coal thickener overflow, 28 a tail coal thickener underflow, 29 a tail coal filter-press dehydration product, 30 a tail coal filter-press filtrate, 31 a medium coal product, 32 a clean coal product, A a medium gangue magnetic tail grading cyclone, B a high-frequency sieve, C a coarse medium coal slime centrifuge, D a clean coal magnetic tail grading cyclone, E, TBS a separator, F a stack sieve, G a coarse clean coal slime centrifuge, H, a concentrated slurry machine, I, a flotation machine, J, a clean coal filter press, K, a concentrated slurry machine, L, a flotation machine, M, a medium coal filter press, N, a concentrated machine, O, a tail coal filter press, P and a circulating water tank.
Detailed Description
The following description of the embodiments of the present invention, with reference to the accompanying drawings, will be made in further detail for the purpose of providing a more complete, accurate and thorough understanding of the inventive concepts and technical solutions of the present invention, including the shapes of the components, the structures, the mutual positions and connection relationships of the components, the functions and operating principles of the components, the manufacturing processes, the operation and use methods, and the like.
Example (b):
the fine-grained refractory coking coal separation system with high middling content shown in the figure 1 comprises a middling magnetic tail and a clean coal magnetic tail, wherein a grading dehydration centrifugal mechanism is arranged at the discharge end of the middling magnetic tail, the coarse-grained discharge end of the grading dehydration centrifugal mechanism is communicated with a middling bunker, and the fine-grained discharge end of the grading dehydration centrifugal mechanism is communicated with the feed end of a coal mud bunker through a grading flotation scavenging mechanism of the clean coal magnetic tail; the discharge end of the cleaned coal magnetic tail is provided with a graded flotation scavenging mechanism, the heavy product discharge end of the graded flotation scavenging mechanism is communicated with the feed end of the medium coal bunker through a graded dehydration centrifugal mechanism, the light product discharge end of the graded flotation scavenging mechanism is communicated with the feed end of the cleaned coal bunker through a dehydration fine grain grade removing mechanism, and the fine grain discharge end of the dehydration fine grain grade removing mechanism is communicated with the coal slime bunker through the graded flotation scavenging mechanism.
The grading dehydration centrifugal mechanism comprises a grading swirler, a high-frequency dehydration sieve and a coal slurry centrifuge, the discharge end of a medium gangue magnetic tail is connected with the feed end of the grading swirler, the coarse fraction discharge end of the grading swirler is communicated with the feed end of a medium coal bunker through the high-frequency dehydration sieve and the coal slurry centrifuge in sequence, and the fine fraction discharge ends of the grading swirler, the high-frequency dehydration sieve and the coal slurry centrifuge are communicated with the feed end of a second emphasis pulp grinder of the grading flotation scavenging mechanism respectively.
The classifying flotation scavenging mechanism comprises a second classifying cyclone, a TBS separator, a first emphasizing pulp machine, a second emphasizing pulp machine, a first flotation machine, a second flotation machine, a first filter press, a second filter press, a third filter press and a concentration tank, wherein the discharge end of a clean coal magnetic tail is communicated with the feed end of the second classifying cyclone, the coarse fraction discharge end of the second classifying cyclone is communicated with the feed end of the TBS separator, the heavy product discharge end of the TBS separator is communicated with the feed end of a high-frequency dewatering screen of a classifying dewatering centrifugal mechanism, the light product discharge end of the TBS separator is communicated with the feed end of a fine grain dewatering mechanism, the fine fraction discharge end of the second classifying is communicated with the feed end of the first flotation machine through the first emphasizing pulp machine, the fine fraction discharge end of the first flotation machine is communicated with a clean coal bin, the coarse fraction discharge end of the first flotation machine is communicated with the feed end of the second flotation machine through the second emphasizing pulp machine, the fine-grained discharge end of the second flotation machine is communicated with the feed end of the second filter press, the coarse-grained discharge end of the second filter press is communicated with the middling bunker, the coarse-grained discharge end of the second flotation machine is communicated with the third filter press through a concentration tank, and the coarse-grained discharge end of the third filter press is communicated with the coal slime bunker; the water outlet ends of the first filter press, the second filter press, the third filter press and the concentration tank are respectively communicated with circulating water.
The fine grain level discharge end of the stacked sieve and the fine grain level discharge end of the second coal slime centrifugal machine are communicated with the feed end of the first pulp strengthening machine.
The method comprises the following steps: classifying the medium gangue magnetic tail through a first classification cyclone, dehydrating a coarse fraction, then feeding the coarse fraction into a medium coal product, and feeding a fine fraction into a classification flotation scavenging mechanism for a flotation scavenging link;
step two: the clean coal magnetic tail is classified through a second classification cyclone, the coarse fraction enters a TBS separator for separation, the heavy product is dehydrated and enters a medium coal bunker along with the coarse fraction of the medium gangue magnetic tail through a first emphasis slurry machine, a first flotation machine, a second emphasis slurry machine, a second flotation machine and a second filter press, the light product is dehydrated and enters a clean coal bunker after the fine fraction is removed through a dehydration and fine fraction removal mechanism, and the medium fine fraction of the light product overflows and enters a first emphasis slurry machine along with a second classification flow selector and enters a coal mud bunker after the fine fraction is subjected to flotation and roughing;
step three: a flotation roughing link and a flotation scavenging link adopt an ore pulp slurry enhancing technology before selection, so that 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 coarse flotation cleaned coal into a cleaned coal product, and performing flotation and coarse flotation tailing in a flotation scavenging link; the flotation scavenging feed is fine fraction in the flotation roughing tailing and middling magnetic tailing treatment process, the flotation scavenging clean coal is dehydrated into middling products, and the flotation scavenging tailing is dehydrated into tailing mud products.
As shown in fig. 2, firstly, the medium gangue magnetic tail 1 is fed into a medium gangue magnetic tail classification cyclone A for classification, coarse-fraction materials enter a high-frequency sieve B along with the underflow 2 of the medium gangue magnetic tail classification cyclone for dehydration and fine fraction removal, oversize products 4 enter a coarse medium coal slime centrifuge C for dehydration, dehydrated products 7 enter a medium coal product 31, and the high-frequency sieve undersize products 5 and the coarse medium coal slime centrifuge centrifugate 6 enter a flotation scavenging system along with the overflow 3 of the medium gangue magnetic tail classification cyclone.
The clean coal magnetic tail 8 is fed into a clean coal magnetic tail grading cyclone D for grading, the coarse fraction material enters a TBS separator E for grading along with the underflow 9 of the clean coal magnetic tail grading cyclone, the heavy product enters a high-frequency sieve B for dewatering and fine fraction removal along with the underflow 12 of the TBS separator, the light product enters a stack sieve F for dewatering and fine fraction removal along with the overflow 11 of the TBS separator, the oversize product 13 enters a coarse clean coal slime centrifuge G for dewatering treatment, the dewatered product 15 enters a clean coal product 32, and the stack sieve undersize product 14 and the coarse clean coal slime centrifuge centrifugate 16 enter a flotation scavenging roughing system along with the overflow 10 of the clean coal magnetic tail grading.
The flotation roughing feed comprises overflow 10 of a clean coal magnetic tail grading cyclone, centrifugal liquid 16 of a rough clean coal slime centrifugal machine and a superposed screen undersize product 14, the part of ore pulp enters an emphasis pulp machine H for size mixing, then middle coal ore pulp 22 after strong size mixing enters a flotation machine I for flotation roughing, flotation roughing clean coal 18 enters a clean coal press filter J for press filtration and dehydration, a clean coal press filtration and dehydration product 20 is mixed with a clean coal product, clean coal press filtration filtrate 21 enters a circulating water tank P, flotation roughing tail coal 19, a high-frequency screen undersize product 5, rough middle coal slime centrifugal liquid 6, overflow 3 of a middle gangue magnetic tail grading cyclone enter the emphasis pulp machine K for emphasis pulp processing, after strong size mixing, the middle coal ore pulp 22 enters a flotation machine L for scavenging, flotation scavenging clean coal 23 enters a middle coal press filter M for press filtration and dehydration product 25 of middle coal is mixed with a middle coal product, middle coal filtrate 26 enters the circulating water tank P, flotation scavenging tail coal 24 enters a thickener N, and enabling the overflow 27 of the tailing thickener to enter a circulating water pool P, enabling the underflow 28 of the tailing thickener to enter a tailing filter press O for filter pressing and dehydration, enabling a tailing filter pressing and dehydration product 29 to be a coal slime product, and enabling tailing filter pressing filtrate 30 to enter the circulating water pool P.
In general, the process produces three products, namely clean coal 32, middlings 31 and coal slurry 29, wherein the clean coal 32 is obtained from a coarse clean coal slurry centrifuge dehydration product 15 and a flotation clean coal 18 press filtration dehydration product 20, the middlings 31 are obtained from a coarse clean coal slurry centrifuge dehydration product 7 and a flotation scavenging clean coal 23 press filtration dehydration product 25, and the coal slurry 29 is obtained from a flotation scavenging tail coal 24 dehydration product 29.
By adopting the technical scheme, the system provides a separation process of strong pulp mixing and two-stage three-product flotation recovery before the fine-grained refractory coking coal with high middlings content, and realizes the high-efficiency separation and recovery of the fine-grained refractory coking coal with high middlings content, and in addition, the system has the following advantages: by adopting a two-stage three-product flotation process, 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; 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 the medium-ash fine mud and the intergrowth in the medium gangue magnetic tail to a flotation clean coal product is avoided; the process can ensure that part of the coal slime enters a middling product after coarse fraction dehydration and a fine fraction flotation scavenging to recover the middling product, namely the TBS underflow coal leakage product finally enters the middling product, thereby realizing the maximum recovery of useful components; the separation process provided by the invention has the advantages of simple flow, low investment, low operation cost and remarkably improved economic benefit.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (5)
1. A fine-grained refractory coking coal separation system with high medium coal content comprises a medium gangue magnetic tail and a clean coal magnetic tail, and is characterized in that: a discharge end of the middle gangue magnetic tail is provided with a grading dehydration centrifugal mechanism, a coarse fraction discharge end of the grading dehydration centrifugal mechanism is communicated with the middle coal bin, and a fine fraction discharge end of the grading dehydration centrifugal mechanism is communicated with a feed end of the coal mud bin through a grading flotation scavenging mechanism of the clean coal magnetic tail; the discharge end of the cleaned coal magnetic tail is provided with a graded flotation scavenging mechanism, the heavy product discharge end of the graded flotation scavenging mechanism is communicated with the feed end of the medium coal bunker through a graded dehydration centrifugal mechanism, the light product discharge end of the graded flotation scavenging mechanism is communicated with the feed end of the cleaned coal bunker through a dehydration fine grain grade removing mechanism, and the fine grain discharge end of the dehydration fine grain grade removing mechanism is communicated with the coal slime bunker through the graded flotation scavenging mechanism.
2. The system for sorting fine-grained hard coking coal with high content of middlings as claimed in claim 1, wherein: hierarchical dehydration centrifugal mechanism includes hierarchical swirler, high frequency dewatering sieve and coal slime centrifuge No. one, the discharge end of well waste rock magnetism tail is connected with the feed end of hierarchical swirler No. one, the coarse grain level discharge end of hierarchical swirler loop through high frequency dewatering sieve and coal slime centrifuge and the feed end intercommunication of well coal bunker, the fine grain level discharge end of hierarchical swirler, high frequency dewatering sieve and coal slime centrifuge divide equally do not with the feed end intercommunication of No. two accentuation pulp machines that hierarchical flotation scavenging mechanism has.
3. The system for sorting fine-grained hard coking coal with high content of middlings as claimed in claim 1, wherein: the classification flotation scavenging mechanism comprises a second classification cyclone, a TBS separator, a first emphasis pulp machine, a second emphasis pulp machine, a first flotation machine, a second flotation machine, a first filter press, a second filter press, a third filter press and a concentration tank, the discharge end of the clean coal magnetic tail is communicated with the feed end of the second classification cyclone, the coarse fraction discharge end of the second classification cyclone is communicated with the feed end of the TBS separator, the heavy product discharge end of the TBS separator is communicated with the feed end of a high-frequency dewatering screen of the classification dewatering centrifugal mechanism, the light product discharge end of the TBS separator is communicated with the feed end of the dewatering and fine particle removing mechanism, the fine fraction discharge end of the second classification cyclone is communicated with the feed end of the first flotation machine through the first emphasis pulp machine, the fine fraction discharge end of the first flotation machine is communicated with the clean coal bin, the coarse fraction discharge end of the first flotation machine is communicated with the feed end of the second flotation machine through the second emphasis pulp machine, the fine-fraction discharge end of the second flotation machine is communicated with the feed end of the second filter press, the coarse-fraction discharge end of the second filter press is communicated with the middling bunker, the coarse-fraction discharge end of the second flotation machine is communicated with the third filter press through a concentration tank, and the coarse-fraction discharge end of the third filter press is communicated with the coal slime bunker; the water outlet ends of the first filter press, the second filter press, the third filter press and the concentration tank are respectively communicated with circulating water.
4. The system for sorting fine-grained hard coking coal with high content of middlings as claimed in claim 3, wherein: the fine fraction mechanism is removed in dehydration includes folding sieve and No. two coal slime centrifuger, the light result discharge end of TBS sorter and the feed end intercommunication of folding the sieve, the coarse fraction discharge end of folding the sieve through No. two coal slime centrifuger coarse fraction discharge end with clean coal bunker intercommunication, the fine fraction discharge end of folding sieve and No. two coal slime centrifuger with the feed end intercommunication of emphasis pulp grinder No. one.
5. A method for sorting fine-grained hard coking coal with high content of middlings, which comprises the fine-grained hard coking coal sorting system with high content of middlings, as claimed in any one of claims 1 to 4, and is characterized by comprising the following steps:
the method comprises the following steps: the medium gangue magnetic tail is classified through the first classification cyclone, coarse fraction enters a medium coal product after dehydration, and fine fraction enters a classification flotation scavenging mechanism for a flotation scavenging link;
step two: the clean coal magnetic tail is classified through a second classification cyclone, the coarse fraction enters a TBS separator for separation, the heavy product is dehydrated and enters a medium coal bunker through a first emphasis pulp machine, a first flotation machine, a second emphasis pulp machine, a second flotation machine and a second filter press along with the coarse fraction of the medium gangue magnetic tail, the light product is dehydrated and enters a clean coal bunker after the fine fraction is removed through a dehydration and fine fraction removal mechanism, and the medium fine fraction of the light product overflows and enters a first emphasis pulp machine along with a second classification flow selector and enters a coal mud bunker after the fine fraction is subjected to flotation and roughing;
step three: a flotation roughing link and a flotation scavenging link adopt an ore pulp slurry enhancing technology before selection, so that 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 coarse flotation cleaned coal into a cleaned coal product, and performing flotation and coarse flotation tailing in a flotation scavenging link; the flotation scavenging feed is fine fraction in the flotation roughing tailing and middling magnetic tailing treatment process, the flotation scavenging clean coal is dehydrated into middling products, and the flotation scavenging tailing is dehydrated into tailing mud products.
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