Coal full-size three-product fine separation process
By employing a multi-particle-size coal slime separation process, and utilizing intelligent dry separation, flotation, a three-product spiral, and a heavy medium cyclone system, the problem of fine separation of raw coal has been solved. This process achieves efficient separation of clean coal, middlings, and gangue, improving the clean coal recovery rate and separation accuracy, and meeting the quality requirements of coal products.
Patent Information
- Application Number
- CN202411713412.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2044-11-27
AI Technical Summary
Existing technologies are insufficient for efficient and precise separation of raw coal, resulting in low clean coal recovery rates, reduced coal quality, and an inability to meet users' high requirements for coal product quality.
The multi-size coal slime separation process is adopted, including the first raw coal screening, the second-size raw coal separation, the second raw coal screening, the third raw coal screening, fine coal slime separation and coarse coal slime separation. Through intelligent dry separation system, flotation system, three-product spiral separation system and three-product heavy medium cyclone system, clean coal, middlings and gangue are obtained respectively.
It has achieved fine separation of three products across the entire coal particle size range of 0-300mm, improved the recovery rate of clean coal, met the separation accuracy and quality indicators, reduced the coal slime contamination rate, and increased the economic benefits of enterprises.
Smart Images
Figure CN119549276B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of coal separation, in particular to a coal full-size three-product fine separation process. BACKGROUND
[0002] Coal is the main energy source in China, accounting for more than 70% of primary energy. Because China's coal resources are more abundant than oil and natural gas resources, China cannot easily change the primary energy production and consumption structure dominated by coal in the foreseeable future. Washing and reprocessing of mined raw coal plays a crucial role in coal production and efficient utilization, and is the basis and prerequisite for realizing clean utilization of coal, energy saving and emission reduction, and sustainable and healthy development.
[0003] In recent years, with the increasing mechanization of coal mining in China, the content of gangue and fine particles mixed in raw coal has gradually increased, and the quality of raw coal has shown a downward trend. Under the current double-carbon development background, users have higher requirements for the quality of coal products, and high-quality coal energy supply needs to be achieved through efficient and fine separation of coal. Therefore, coal full-size separation process technology has attracted more and more attention from domestic and foreign coal separation workers. SUMMARY
[0004] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a coal full-size three-product fine separation process. The present application realizes the fine separation of 0-300mm coal full-size three products by separately separating multiple particle size coal slurry, and simultaneously separates fine coal, medium coal and gangue, which meets the separation accuracy and quality index, improves the recovery rate of fine coal, fully recovers coal resources, and increases the economic benefits of enterprises.
[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a coal full-size three-product fine separation process, comprising the following steps:
[0006] (a) First raw coal screening: the raw coal is screened by a classification screen to obtain first-size raw coal and second-size raw coal;
[0007] (b) Second-size raw coal separation: the second-size raw coal in step a is fed into an intelligent dry separation system to obtain lump fine coal, lump medium coal and lump gangue, the lump medium coal is fed into a medium coal bin, and the lump gangue is fed into a gangue bin;
[0008] (c) Second raw coal screening: the first-size raw coal in step a and the lump fine coal in step b are mixed and screened by a desliming screen to obtain third-size raw coal and fourth-size raw coal;
[0009] (d) Third raw coal screening: the third-size raw coal in step c is separated by a classification cyclone to obtain fine coal slurry and coarse coal slurry;
[0010] (e1) Fine slime separation: the fine slime in step d is separated by a flotation system to obtain floating clean slime, floating medium slime and floating tail slime, the floating clean slime enters a clean coal bin, the floating medium slime enters a medium coal bin, and the floating tail slime enters a gangue bin;
[0011] (e2) Coarse slime separation: the coarse slime in step d is separated by a three-product spiral separation system to obtain coarse clean coal, coarse medium coal and coarse gangue, the coarse clean coal enters a clean coal bin, the coarse medium coal enters a medium coal bin, and the coarse gangue enters a gangue bin;
[0012] (f) Fourth particle size raw coal separation: after the fourth particle size raw coal in step c is separated by a three-product dense medium cyclone system, final clean coal, final medium coal, final gangue and qualified medium are obtained, the final clean coal enters a clean coal bin, the final medium coal enters a medium coal bin, the final gangue enters a gangue bin, and the qualified medium enters a medium mixing barrel.
[0013] Preferably, the step of the second particle size raw coal entering an intelligent dry separation system comprises:
[0014] (b1) Raw coal crushing: the second particle size raw coal enters a through-type crusher, the through-type crusher crushes the second particle size raw coal to less than 300 mm to obtain second particle size raw coal with a particle size of less than 300 mm;
[0015] (b2) Roller screen screening: the second particle size raw coal with a particle size of less than 300 mm in step b1 is screened by a roller screen to obtain raw coal with a particle size of less than 50 mm and raw coal with a particle size of more than 50 mm, and the raw coal with a particle size of less than 50 mm is mixed with the first particle size raw coal;
[0016] (b3) Intelligent dry separator separation: the raw coal with a particle size of more than 50 mm in step b2 is separated by an intelligent dry separator to obtain lump clean coal, lump medium coal and lump gangue, and the lump clean coal is crushed by a crusher to be lump clean coal with a particle size of less than 50 mm.
[0017] Preferably, the step of the fine slime entering a flotation system comprises:
[0018] (e 101 ) Slime flotation: the fine slime enters a flotation machine for separation to obtain flotation clean coal, flotation medium coal and flotation tail coal;
[0019] (e 102 ) Flotation clean coal pressure filtration: the flotation clean coal in step e 101 enters a first pressure filter to obtain floating clean slime;
[0020] (e 103 ) Flotation medium coal pressure filtration: the flotation medium coal in step e 101 enters a second pressure filter to obtain floating medium slime;
[0021] (e 104 Flotation tailings filter press: Step e 101 The flotation tailings described herein are processed by a thickener and a third filter press to obtain flotation tailings slime.
[0022] Preferably, the step of the coarse coal slime entering the three-product spiral separator includes:
[0023] (e 201 Coal slime separation: Coarse coal slime is separated into coarse fine coal slime, coarse medium coal slime and coarse gangue slime by a three-product spiral separator;
[0024] (e 202 Coarse and fine coal slime dewatering: Step e 201 The coarse coal slime described herein is dewatered by the first arc screen and the first centrifuge to obtain coarse coal;
[0025] (e 203 Coarse and medium coal slime dewatering: Step e 201 The coarse and medium coal slime described herein is dewatered by the second arc screen and the first high-frequency screen to obtain coarse and medium coal slime;
[0026] (e 204 Dewatering of coarse gangue mud: Step e 201 The coarse gangue mud described herein is dewatered through a third arc screen and a second high-frequency screen to obtain coarse gangue.
[0027] Preferably, the step of the fourth-stage raw coal entering the three-product heavy medium cyclone system includes:
[0028] (f1) Coal slime separation: The fourth-grade raw coal is processed by a three-product heavy medium cyclone to obtain fine coal, fine middlings and fine gangue;
[0029] (f2) Fine coal desliming: The fine coal in step f1 is passed through a fine coal desliming screen to obtain oversize material, dilute medium and qualified medium. The oversize material is dewatered by a second centrifuge to obtain fine coal, which enters the fine coal bin. The dilute medium is magnetically separated by a first magnetic separator to obtain magnetic concentrate and magnetic tail. The magnetic concentrate and qualified medium enter the combined medium tank, and the magnetic tail enters the classifying hydrocyclone.
[0030] (f3) Mid-coal dewatering: The mid-coal in step f1 is dewatered by a mid-coal dewatering screen to obtain oversize material, dilute medium and qualified medium. The oversize material is dewatered by a third centrifuge to obtain mid-coal, which enters the mid-coal silo. The dilute medium is magnetically separated by a second magnetic separator to obtain magnetic concentrate and magnetic tail. The magnetic concentrate and qualified medium enter the combined medium tank, and the magnetic tail enters the classifying hydrocyclone.
[0031] (f4) tail gangue desliming: the tail gangue in step f1 is subjected to gangue desliming screen to obtain tail gangue, dilute medium and qualified medium, the dilute medium is subjected to magnetic separation by a third magnetic separator to obtain magnetic concentrate and magnetic tailings, the magnetic concentrate and the qualified medium enter a medium mixing barrel, and the magnetic tailings enter a classification cyclone, and the tail gangue enters a gangue bin.
[0032] Preferably, the screen hole of the classification screen is 50mm, the first particle size raw coal is the undersize of the classification screen, the particle size of the first particle size raw coal is less than 50mm, the second particle size raw coal is the oversize of the classification screen, and the particle size of the second particle size raw coal is greater than 50mm.
[0033] Preferably, the screen hole of the desliming screen is 1mm, the third particle size raw coal is the undersize of the desliming screen, the particle size of the third particle size raw coal is less than 1mm, the fourth particle size raw coal is the oversize of the desliming screen, and the particle size of the fourth particle size raw coal is 1-50mm.
[0034] Preferably, the particle size of the fine coal slime is less than 0.25mm, and the particle size of the coarse coal slime is 0.25-1mm.
[0035] Preferably, the three-product dense medium cyclone generates secondary coal slime with a particle size less than 1mm due to large feeding pressure, and the secondary coal slime with a particle size less than 1mm is sent to the classification cyclone.
[0036] Compared with the prior art, the present application has the following advantages:
[0037] 1. The present application realizes full particle size three-product fine separation of coal slime with a particle size less than 300mm by separately sorting coal slime with different particle sizes, and simultaneously separates three products of clean coal, medium coal and gangue, which meets the separation accuracy and quality index, improves the clean coal recovery rate, fully recovers coal resources and increases the economic benefit of enterprises.
[0038] 2. The present application performs multi-stage screening on raw coal, first divides the raw coal into raw coal with a particle size less than 50mm and raw coal with a particle size greater than 50mm, then crushes and screens the raw coal with a particle size greater than 50mm into raw coal with a particle size less than 50mm and raw coal with a particle size greater than 50mm, sorts the raw coal with a particle size greater than 50mm, breaks the lump clean coal obtained by sorting into raw coal with a particle size less than 50mm by a crusher, screens all the raw coal with a particle size less than 50mm to obtain raw coal with a particle size less than 1mm and 1-50mm particle size raw coal, and continues to screen the raw coal with a particle size less than 1mm into fine coal slime with a particle size less than 0.25mm and coarse coal slime with a particle size of 0.25-1mm, thereby reducing the adulteration rate of coal slime.
[0039] The present application will be further described in detail below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS
[0040] Figure 1 Process flow chart of the present application;
[0041] Figure 2 Device relationship connection chart of the present application.
[0042] Legend:
[0043] A - sizing screen; B - crusher; C - roller screen;
[0044] D - desliming screen; E - intelligent dry separator; F - middlings bin;
[0045] G - gangue bin; H - three-product heavy medium cyclone;
[0046] I1 - clean coal desliming screen; I2 - middlings desliming screen; I3 - gangue desliming screen;
[0047] J1 - second centrifuge; J2 - third centrifuge; J3 - first centrifuge;
[0048] K - clean coal bin; L1 - first magnetic separator; L2 - second magnetic separator;
[0049] L3 - third magnetic separator; M - medium mixing bin; N - classifying cyclone;
[0050] O1 - first filter press; O2 - second filter press; O3 - third filter press;
[0051] P - thickener; Q1 - first arc screen; Q2 - second arc screen;
[0052] Q3 - third arc screen; R1 - first high-frequency screen; R2 - second high-frequency screen;
[0053] S - crusher; T - flotation machine;
[0054] U - three-product spiral separator. DETAILED DESCRIPTION
[0055] As shown in the drawings, the present application discloses a coal full-grain three-product fine separation process, comprising the following steps: Figure 1
[0056] (a) first raw coal screening: the raw coal for separation is screened by a sizing screen to obtain first-grain raw coal and second-grain raw coal;
[0057] The screen hole of the sizing screen is 50 mm, the first-grain raw coal is the undersize of the sizing screen, the particle size of the first-grain raw coal is less than 50 mm, and the second-grain raw coal is the oversize of the sizing screen, and the particle size of the second-grain raw coal is greater than 50 mm.
[0058] (b) second particle size raw coal separation: the second particle size raw coal in step a enters the intelligent dry separation system to obtain lump clean coal, lump medium coal and lump gangue, the lump medium coal enters the medium coal bin, and the lump gangue enters the gangue bin;
[0059] The step of the second particle size raw coal entering the intelligent dry separation system includes:
[0060] (b1) raw coal crushing: the second particle size raw coal enters the through crusher, the through crusher crushes the second particle size raw coal to less than 300 mm, and the second particle size raw coal with a particle size less than 300 mm is obtained;
[0061] (b2) roller screen screening: the second particle size raw coal with a particle size less than 300 mm in step b1 is screened by the roller screen to obtain raw coal with a particle size less than 50 mm and raw coal with a particle size greater than 50 mm, and the raw coal with a particle size less than 50 mm is mixed with the first particle size raw coal,
[0062] The screen hole of the roller screen screen plate is 50 mm, and further, the roller screen can also be a flip-flow screen.
[0063] (b3) intelligent dry separator separation: the raw coal with a particle size greater than 50 mm in step b2 is separated by the intelligent dry separator to obtain lump clean coal, lump medium coal and lump gangue, and the lump clean coal is crushed by the crusher to be less than 50 mm.
[0064] The lump clean coal with a particle size less than 50 mm is mixed with the first particle size raw coal and then enters the desliming screen, the lump medium coal enters the medium coal bin, and the lump gangue enters the gangue bin.
[0065] (c) second raw coal screening: the first particle size raw coal in step a and the lump clean coal in step b are mixed and then screened by the desliming screen to obtain third particle size raw coal and fourth particle size raw coal;
[0066] The screen hole of the desliming screen is 1 mm, the third particle size raw coal is the undersize of the desliming screen, the particle size of the third particle size raw coal is less than 1 mm, the fourth particle size raw coal is the oversize of the desliming screen, and the particle size of the fourth particle size raw coal is 1-50 mm. The desliming screen with a screen hole of 1 mm is selected, so that the desliming screen can deslime the slime, and the separation efficiency and separation accuracy of the oversize of the desliming screen entering the three-product dense medium cyclone are improved.
[0067] (d) third raw coal screening: the third particle size raw coal in step c is separated by the classifying cyclone to obtain fine slime and coarse slime;
[0068] The particle size of the fine slime is less than 0.25 mm, and the particle size of the coarse slime is 0.25-1 mm.
[0069] (e1) Fine slime separation: the fine slime in step d is separated by a flotation system to obtain floating fine slime, floating medium slime and floating tail slime, the floating fine slime enters the clean coal bin, the floating medium slime enters the medium coal bin, and the floating tail slime enters the gangue bin;
[0070] The step of the fine slime entering the flotation system includes:
[0071] (e 101 ) Coal slime flotation: the fine slime enters a flotation machine for separation to obtain flotation clean coal, flotation medium coal and flotation tail coal;
[0072] (e 102 ) Flotation clean coal filter pressing: the flotation clean coal in step e 101 is filter pressed by a first filter press to obtain floating fine slime;
[0073] (e 103 ) Flotation medium coal filter pressing: the flotation medium coal in step e 101 is filter pressed by a second filter press to obtain floating medium slime;
[0074] (e 104 ) Flotation tail coal filter pressing: the flotation tail coal in step e 101 is filter pressed by a thickener and a third filter press to obtain floating tail slime.
[0075] (e2) Coarse slime separation: the coarse slime in step d is separated by a three-product spiral separation system to obtain coarse clean coal, coarse medium coal and coarse gangue, the coarse clean coal enters the clean coal bin, the coarse medium coal enters the medium coal bin, and the coarse gangue enters the gangue bin.
[0076] The step of the coarse slime entering the three-product spiral separation system includes:
[0077] (e 201 ) Separated slime: the coarse slime is separated by a three-product spiral separator to obtain coarse fine slime, coarse medium slime and coarse gangue slime;
[0078] (e 202 ) Coarse fine slime dewatering: the coarse fine slime in step e 201 is dewatered by a first curved screen and a first centrifuge to obtain coarse clean coal;
[0079] The curved screen can also be a laminated screen or an electromagnetic screen or a high-frequency screen.
[0080] (e 203 ) Coarse medium slime dewatering: the coarse medium slime in step e 201 is dewatered by a second curved screen and a first high-frequency screen to obtain coarse medium slime;
[0081] (e 204 ) Coarse gangue slime dewatering: the coarse gangue slime in step e 201 is dewatered by a third curved screen and a second high-frequency screen to obtain coarse gangue.
[0082] (f) fourth particle size raw coal separation: the fourth particle size raw coal in step c is subjected to a three-product dense medium cyclone system, to obtain final clean coal, final medium coal, final gangue and qualified medium, the final clean coal is put into a clean coal bin, the final medium coal is put into a medium coal bin, the final gangue is put into a gangue bin, and the qualified medium is put into a medium mixing barrel.
[0083] The three-product dense medium cyclone produces secondary slime with a particle size less than 1 mm due to large feeding pressure, and the secondary slime with a particle size less than 1 mm is sent to a classification cyclone.
[0084] The step of putting the fourth particle size raw coal into the three-product dense medium cyclone system includes:
[0085] (f1) slime separation: the fourth particle size raw coal is subjected to the three-product dense medium cyclone, to obtain final clean coal, final medium coal and final gangue;
[0086] (f2) final clean coal medium removal: the final clean coal in step f1 is subjected to a clean coal medium removal screen, to obtain oversize, dilute medium and qualified medium, the oversize is subjected to a second centrifuge to obtain final clean coal and put into a clean coal bin, the dilute medium is subjected to a first magnetic separator to obtain magnetic concentrate and magnetic tailings, the magnetic concentrate and the qualified medium are put into a medium mixing barrel, and the magnetic tailings are put into a classification cyclone;
[0087] (f3) final medium coal medium removal: the final medium coal in step f1 is subjected to a medium coal medium removal screen, to obtain oversize, dilute medium and qualified medium, the oversize is subjected to a third centrifuge to obtain final medium coal and put into a medium coal bin, the dilute medium is subjected to a second magnetic separator to obtain magnetic concentrate and magnetic tailings, the magnetic concentrate and the qualified medium are put into a medium mixing barrel, and the magnetic tailings are put into a classification cyclone;
[0088] (f4) final gangue medium removal: the final gangue in step f1 is subjected to a gangue medium removal screen, to obtain final gangue, dilute medium and qualified medium, the dilute medium is subjected to a third magnetic separator to obtain magnetic concentrate and magnetic tailings, the magnetic concentrate and the qualified medium are put into a medium mixing barrel, the magnetic tailings are put into a classification cyclone, and the final gangue is put into a gangue bin.
[0089] The magnetic concentrate and the qualified medium in the medium mixing barrel are put into the three-product dense medium cyclone again for separation; the magnetic tailings are put into the classification cyclone together with the third particle size raw coal, and are separated into fine slime and coarse slime by the classification cyclone.
[0090] As shown in the equipment connection diagram, the present application is described in detail. Figure 2
[0091] The selected raw coal 1 (coal slime with particle size less than 300 mm) is screened by a grading screen A with a screen hole of 50 mm to obtain first particle size raw coal 2 and second particle size raw coal 3, the second particle size raw coal 3 enters a passing crusher B, the passing crusher B crushes the second particle size raw coal 3 to a particle size of less than 300 mm, the crushed second particle size raw coal 3 is screened by a roller screen C with a screen hole of 50 mm to obtain raw coal 4 with a particle size of less than 50 mm and raw coal 5 with a particle size of 50-300 mm, the raw coal 4 with a particle size of less than 50 mm and the first particle size raw coal 2 enter a desliming screen D with a screen hole of 1 mm, the raw coal 5 with a particle size of 50-300 mm enters an intelligent dry separator E, and lump clean coal 6, lump medium coal 7 and lump gangue 8 are separated, the lump medium coal 7 goes to a medium coal bin F, the lump gangue 8 goes to a gangue bin G, the lump clean coal 6 is crushed to raw coal with a particle size of less than 50 mm by a crusher S, and the crushed lump clean coal 6 is sent to the desliming screen D, the desliming screen D screens the first particle size raw coal 2, the raw coal 4 with a particle size of less than 50 mm and the crushed lump clean coal 6 to obtain third particle size raw coal 9 and fourth particle size raw coal 10, the fourth particle size raw coal 10 enters a three-product dense medium cyclone H for separation to obtain final clean coal slime 11, final medium coal slime 12 and final gangue slime 13, at the same time, due to the large feeding pressure of the three-product dense medium cyclone H, secondary coal slime 14 with a particle size of less than 1 mm is generated, and the secondary coal slime 14 is sent to a grading cyclone N for separation, the final clean coal slime 11 is dewatered by a clean coal medium draining screen I1 to obtain oversize 151, dilute medium 161 and qualified medium 171, the oversize 151 is dewatered by a second centrifuge J1 to obtain final clean coal 20, the final clean coal 20 enters a clean coal bin K, the dilute medium 161 enters a first magnetic separator L1 for magnetic separation to obtain magnetic concentrate 181 and magnetic tailings 191, the magnetic concentrate 181 and the qualified medium 171 enter a medium mixing barrel M, the final medium coal slime 12 is dewatered by a medium coal medium draining screen I2 to obtain oversize 152, dilute medium 162 and qualified medium 172, the oversize 152 is dewatered by a third centrifuge J2 to obtain final medium coal 21, the final medium coal 21 enters the medium coal bin F, the dilute medium 162 enters a second magnetic separator L2 for magnetic separation to obtain magnetic concentrate 182 and magnetic tailings 192, the magnetic concentrate 182 and the qualified medium 172 enter the medium mixing barrel M, the final gangue slime 13 is dewatered by a gangue medium draining screen I3 to obtain oversize 153, dilute medium 163 and qualified medium 173, the oversize 153 enters the gangue bin G, the dilute medium 163 enters a third magnetic separator L3 for magnetic separation to obtain magnetic concentrate 183 and magnetic tailings 193, the magnetic concentrate 183 and the qualified medium 173 enter the medium mixing barrel M, and the magnetic tailings 191, 192 and 193 enter the three-product dense medium cyclone for separation.
[0092] Meanwhile, the third particle size raw coal 9 and the secondary coal slime 14 are separated by the grading cyclone N to obtain fine slime 22 and coarse slime 23, the fine slime 22 is fed into the flotation machine T for flotation to obtain flotation clean coal 24, flotation middlings 25 and flotation tailings 26, the flotation clean coal 24 is subjected to pressure filtration by the first pressure filter O1 to obtain flotation clean coal slime 241, the flotation clean coal slime 241 is fed into the clean coal bin K, the flotation middlings 25 are subjected to pressure filtration by the second pressure filter O2 to obtain flotation middlings slime 251, the flotation middlings slime 251 is fed into the middlings bin F, and the flotation tailings 26 are fed into the thickener P and the third pressure filter O3 to obtain flotation tailings slime 261, and the flotation tailings slime 261 is fed into the gangue bin G. The coarse slime 23 is subjected to separation by the three-product spiral separator U to obtain coarse clean slime 27, coarse middlings slime 28 and coarse gangue slime 29, the coarse clean slime 27 is subjected to dehydration by the first arched screen Q1 and the first centrifuge J3 to obtain coarse clean coal 271, the coarse clean coal 271 is fed into the clean coal bin K, the coarse middlings slime 28 is subjected to dehydration by the second arched screen Q2 and the first high-frequency screen R1 to obtain coarse middlings slime 281, the coarse middlings slime 281 is fed into the middlings bin F, and the coarse gangue slime 29 is subjected to dehydration by the third arched screen Q3 and the second high-frequency screen R2 to obtain coarse gangue 291, and the coarse gangue 291 is fed into the gangue bin G.
[0093] The present application comprises the following steps: the raw coal with particle size greater than 50 mm is separated by an intelligent dry separation system, the 1-50 mm particle size raw coal is separated by a three-product dense medium cyclone system, the 0.25-1 mm particle size coarse slime is separated by a three-product spiral separation system, and the fine slime with particle size less than 0.25 mm is fed into a flotation system for separation; the separated end clean coal, coarse clean coal and flotation clean coal slime are fed into a clean coal bin as final clean coal, the lump middlings, end middlings, coarse middlings and flotation middlings slime are fed into a middlings bin as final middlings, and the lump gangue, end gangue, coarse gangue and flotation tailings slime are fed into a gangue bin as final gangue; the product mixing and blending mode of each particle size can be flexibly adjusted according to the market demand of products, and products with different quality specifications can be produced. The present application can realize three-product fine separation of coal with particle size less than 300 mm, and separate out clean coal, middlings and gangue, which can improve the clean coal recovery rate, fully recover coal resources and increase the economic benefits of enterprises.
[0094] The above description is only a preferred embodiment of the present application, and does not limit the present application in any way, and any simple modification, change and equivalent structure change made to the above embodiment according to the technical essence of the present application still belong to the protection scope of the technical solution of the present application.
Claims
1. A coal full-size fraction three-product fine separation process, characterized in that, The method comprises the following steps: (a) first raw coal screening: raw coal is screened by a grading screen to obtain first size raw coal and second size raw coal; (b) second size raw coal separation: the second size raw coal in step a is fed into an intelligent dry separation system to obtain lump clean coal, lump medium coal and lump gangue, the lump medium coal is fed into a medium coal bin, and the lump gangue is fed into a gangue bin; (c) second raw coal screening: the first size raw coal in step a and the lump clean coal in step b are mixed and screened by a desliming screen to obtain third size raw coal and fourth size raw coal; (d) third raw coal screening: the third size raw coal in step c is separated by a grading cyclone to obtain fine coal slime and coarse coal slime; (e1) fine coal slime separation: the fine coal slime in step d is separated by a flotation system to obtain floating clean coal slime, floating medium coal slime and floating tail coal slime, the floating clean coal slime is fed into a clean coal bin, the floating medium coal slime is fed into a medium coal bin, and the floating tail coal slime is fed into a gangue bin; (e2) coarse coal slime separation: the coarse coal slime in step d is separated by a three-product spiral separation system to obtain coarse clean coal, coarse medium coal and coarse gangue, the coarse clean coal is fed into a clean coal bin, the coarse medium coal is fed into a medium coal bin, and the coarse gangue is fed into a gangue bin; (f) fourth size raw coal separation: the fourth size raw coal in step c is separated by a three-product dense medium cyclone system to obtain final clean coal, final medium coal, final gangue and qualified medium, the final clean coal is fed into a clean coal bin, the final medium coal is fed into a medium coal bin, the final gangue is fed into a gangue bin, and the qualified medium is fed into a medium mixing barrel; The step of feeding the second size raw coal into the intelligent dry separation system comprises: (b1) raw coal crushing: the second size raw coal is fed into a through-type crusher, the through-type crusher crushes the second size raw coal to less than 300 mm, and second size raw coal with a particle size of less than 300 mm is obtained; (b2) roller screen screening: the second size raw coal with a particle size of less than 300 mm in step b1 is screened by a roller screen to obtain raw coal with a particle size of less than 50 mm and raw coal with a particle size of more than 50 mm, and the raw coal with a particle size of less than 50 mm is mixed with the first size raw coal; (b3) intelligent dry separator separation: the raw coal with a particle size of more than 50 mm in step b2 is separated by an intelligent dry separator to obtain lump clean coal, lump medium coal and lump gangue, and the lump clean coal is crushed by a crusher to be lump clean coal with a particle size of less than 50 mm; The step of feeding the coarse coal slime into the three-product spiral separation system comprises: (e 201 ) sorting slime: coarse slime is sorted by a three-product spiral separator to obtain coarse clean slime, coarse medium slime and coarse gangue slime; (e 202 ) coarse slime dewatering: step e 201 After the coarse slime described in the step e of the present application is dewatered by the first arc-shaped screen and the first centrifuge, the coarse slime is obtained. (e 203 ) coarse medium slime dewatering: step e 201 The coarse medium slime is obtained after the coarse medium slime in the medium is dewatered by the second arc screen and the first high-frequency screen. (e 204 ) coarse gangue mud dewatering: step e 201 After the coarse gangue mud described in the step e of the embodiment 1 is dewatered by the third arc screen and the second high-frequency screen, the coarse gangue is obtained. The step of feeding the fourth size raw coal into the three-product dense medium cyclone system comprises: (f1) raw coal separation: the fourth size raw coal is separated by a three-product dense medium cyclone to obtain final clean coal, final medium coal and final gangue; (f2) final clean coal desliming: the final clean coal in step f1 is deslimed by a clean coal desliming screen to obtain oversize material, dilute medium and qualified medium, the oversize material is dewatered by a second centrifuge to obtain final clean coal, which is fed into a clean coal bin, the dilute medium is magnetically separated by a first magnetic separator to obtain magnetic clean coal and magnetic tailings, the magnetic clean coal and the qualified medium are fed into a medium mixing barrel, and the magnetic tailings are fed into a grading cyclone; (f3) the fine medium coal is screened by a medium coal screening sieve, to obtain a sieve upper, a dilute medium and a qualified medium, the sieve upper is dewatered by a third centrifuge to obtain fine medium coal, which is fed into a medium coal bin, the dilute medium is magnetically separated by a second magnetic separator to obtain magnetic concentrate and magnetic tailings, the magnetic concentrate and the qualified medium are fed into a medium mixing barrel, and the magnetic tailings are fed into a classification cyclone; (f4) the fine gangue is screened by a gangue screening sieve, to obtain fine gangue, a dilute medium and a qualified medium, the dilute medium is magnetically separated by a third magnetic separator to obtain magnetic concentrate and magnetic tailings, the magnetic concentrate and the qualified medium are fed into a medium mixing barrel, and the magnetic tailings are fed into a classification cyclone, and the fine gangue is fed into a gangue bin.
2. A coal full range three product fine coal cleaning process according to claim 1 characterised in that, The step of feeding the fine coal slime into the flotation system comprises: (e 101 ) coal slime flotation: the fine coal slime enters into a flotation machine for separation to obtain flotation clean coal, flotation middlings and flotation tailings; (e 102 ) Filtration of the cleaned coal: step e 101 The cleaned coal in step (e) is filtered by a first filter to obtain cleaned coal slime. (e 103 ) coal filter pressing in the flotation middlings; step e 101 The flotation middlings are filter pressed by a second filter press to obtain flotation middlings. (e 104 ) Floatation tailings pressure filtration: step e 101 The floatation tailings described in step e in the middle are concentrated by a thickener and a third pressure filter to obtain floatation tailings slurry.
3. A coal full range three product fine coal cleaning process according to claim 1 characterised in that: The screen hole of the classification screen is 50 mm, the first particle size raw coal is the undersize of the classification screen, the particle size of the first particle size raw coal is less than 50 mm, the second particle size raw coal is the oversize of the classification screen, and the particle size of the second particle size raw coal is greater than 50 mm.
4. A coal full range three-product fine coal cleaning process according to claim 1, characterised in that: The screen hole of the desliming screen is 1 mm, the third particle size raw coal is the undersize of the desliming screen, the particle size of the third particle size raw coal is less than 1 mm, the fourth particle size raw coal is the oversize of the desliming screen, and the particle size of the fourth particle size raw coal is 1-50 mm.
5. A coal full range three-product fine coal cleaning process according to claim 1, characterised in that: The particle size of the fine coal slime is less than 0.25 mm, and the particle size of the coarse coal slime is 0.25-1 mm.
6. A coal full range three product fine coal cleaning process according to claim 2 characterised in that: The three-product dense medium cyclone generates secondary coal slime with a particle size less than 1 mm due to large feeding pressure, and the secondary coal slime with a particle size less than 1 mm is fed into the classification cyclone.
Citation Information
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