CN108855586B - Combined unit for coal flotation - Google Patents
Combined unit for coal flotation Download PDFInfo
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- CN108855586B CN108855586B CN201710331651.2A CN201710331651A CN108855586B CN 108855586 B CN108855586 B CN 108855586B CN 201710331651 A CN201710331651 A CN 201710331651A CN 108855586 B CN108855586 B CN 108855586B
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- 238000005188 flotation Methods 0.000 title claims abstract description 224
- 239000003245 coal Substances 0.000 title claims abstract description 157
- 239000002002 slurry Substances 0.000 claims abstract description 33
- 239000003250 coal slurry Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000001089 mineralizing effect Effects 0.000 claims abstract description 10
- 238000010790 dilution Methods 0.000 claims abstract description 8
- 239000012895 dilution Substances 0.000 claims abstract description 8
- 239000011362 coarse particle Substances 0.000 claims abstract description 6
- 239000012141 concentrate Substances 0.000 claims description 26
- 238000000926 separation method Methods 0.000 claims description 14
- 230000033558 biomineral tissue development Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 13
- 239000000463 material Substances 0.000 abstract description 3
- 238000002347 injection Methods 0.000 abstract 3
- 239000007924 injection Substances 0.000 abstract 3
- 239000002956 ash Substances 0.000 description 13
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 230000005484 gravity Effects 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000008396 flotation agent Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000009291 froth flotation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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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
Landscapes
- Solid Fuels And Fuel-Associated Substances (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
The invention relates to a combined unit for flotation coal. The method comprises the steps of directly feeding coal dressing slurry or diluted coal slime tailing slurry with the coarse particle size fraction of 0mm-0.1mm into a flotation mineralizing device, feeding the mineralized coal slurry into a first flotation, feeding the first flotation clean coal into a second flotation after water injection, and feeding the first flotation tailing into a concentration tank for concentration. After the water injection of the second flotation clean coal, the third flotation is carried out, the second flotation tail coal and the mineralized materials are mixed and enter the first flotation, after the water injection of the second flotation clean coal, the third flotation is carried out, the cleaned coal which is floated is qualified clean coal, the third flotation tail coal enters a coal slime ups and downs machine, the coal slime ups and downs machine overflows and enters a first flotation clean coal pulp tank for dilution, and middlings are produced by the underflow of the coal slime ups and downs machine.
Description
Technical Field
The invention relates to a combined unit for flotation of coal, in particular to a device for recovering clean coal from coal slime with extremely poor floatability.
Background
The traditional coal flotation process comprises the steps of directly feeding coal slurry with the coarse particle size fraction of 0mm-0.5mm into a flotation preprocessor, adding a flotation agent and circulating dilution water, stirring, feeding the mixture into a flotation machine for flotation, and flotation to obtain clean coal and tail coal. The method has the following defects: because the traditional flotation process is adopted, the middlings in the coal slime can not be selected independently, and the ash content of the tail coal is lower under the condition of ensuring that the ash content index of the flotation clean coal is qualified; under the condition of ensuring that the ash content of the tail coal is higher, the ash content index of the flotation clean coal is increased at the same time. The main reasons are as follows: after the middlings enter the flotation cleaned coal, the ash content of the flotation cleaned coal is higher, and after the middlings enter the coal slime tailing coal, the ash content of the coal slime tailing coal is lower. Patent numbers: 2010206966982, patent name: the coal slime sinking and floating machine has the technical problems.
Disclosure of Invention
Aiming at the defects in the prior art, the combined unit for flotation and coal preparation, provided by the invention, solves the problems that the traditional flotation process cannot separately select the middlings in the coal slime, and the ash content of the tail coal is lower under the condition of ensuring that the ash content index of the flotation clean coal is qualified; under the condition of ensuring that the ash content of the tail coal is higher, the ash content index of the flotation clean coal is increased at the same time. The main reasons are as follows: after the middlings enter clean coal, the clean coal ash content is higher, and after the middlings enter coal slime taillight, the coal slime taillight ash content is lower. On the basis, a combined unit for flotation and coal separation is developed, the ash content of flotation clean coal is synchronous with the technical indexes of a coal separation plant, the middlings in coal slime are separated, and the tail coal of the coal slime is not less than the gangue lime of the selected raw coal in the coal separation plant.
In order to achieve the purpose, the invention provides the following technical scheme:
a coal flotation combined unit comprises: cut coarse shale shaker, flotation mineralizer, flotation device I, flotation device II, flotation device III, coal slime ups and downs machine, concentrated pond, cut coarse shale shaker and link to each other with the flotation mineralizer, the flotation mineralizer links to each other with flotation device I, flotation device II, flotation device III links to each other with flotation device II, coal slime ups and downs machine respectively, flotation device I links to each other with concentrated pond, coal slime ups and downs machine respectively.
Wherein, flotation device I is equipped with flotation concentrate case I, and flotation device I links to each other with flotation device II through flotation concentrate case I, flotation device II is equipped with flotation concentrate case II, flotation device II links to each other with flotation device III through flotation concentrate case II, flotation device III connects the feed box on the clean coal pressure filter, flotation device III sends into the clean coal through the feed box on the clean coal pressure filter and stacks the place, the coal slime ups and downs machine connects the middlings pressure filter, and the coal slime ups and downs machine sends into the middlings through the middlings pressure filter and stacks the place.
The coarse-cutting vibrating screen is connected with the flotation mineralizing device through a feeding pump, the flotation mineralizing device and the flotation machine I have high-low fall, coal slurry or diluted coal slurry tailing slurry is mineralized in the flotation mineralizing device, the coal slurry enters the flotation machine I automatically on the basis of the fall existing in the height of the equipment, the flotation concentrate box I is connected with the flotation machine II through the feeding pump, the flotation concentrate box II is connected with the flotation machine III through the feeding pump, the equipment high-low fall existing between the flotation machine III and the coal slurry sinking and floating machine, the coal slurry enters the coal slurry sinking and floating machine automatically, and the coal slurry sinking and floating machine overflow enters the flotation concentrate box I of the flotation machine I automatically on the basis of the height fall existing in the equipment.
The technical scheme is as follows: the coal dressing slurry or diluted coal slime tailing slurry with the size fraction of 0mm-0.1mm is directly fed into a flotation mineralizing device, mineralized and fed into a first flotation machine I for flotation, the first flotation clean coal is injected with water and fed into a second flotation machine II for flotation, and the first flotation tailing slurry is fed into a concentration tank for concentration. After the second flotation clean coal is injected with water, the second flotation clean coal enters a third flotation machine III for flotation, the second flotation tail coal and coal slurry or diluted coal slime tail ore pulp with the coarse particle size fraction of 0mm-0.1mm directly enters a flotation mineralizing device to be mixed and enters the first flotation, after the second flotation clean coal is injected with water, the third flotation is performed, the floated clean coal is qualified clean coal, the third flotation tail coal enters a coal slime ups and downs machine, the coal slime ups and downs machine overflows and enters a first flotation clean coal ore pulp box for dilution, and the bottom flow of the coal slime ups and downs machine produces middlings.
The beneficial effects of the invention are: the combined unit for flotation and coal separation provided by the invention has the advantages that the ash content of flotation clean coal is synchronous with the technical indexes of a coal separation plant, the middlings in coal slime are separated, and the tail coal of the coal slime is not less than the gangue lime of the selected raw coal in the coal separation plant.
For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the present invention and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the present invention.
Drawings
The technical scheme and other advantages of the invention will be apparent from the detailed description of the specific embodiments of the invention in conjunction with the accompanying drawings.
FIG. 1 is a schematic structural diagram of a coal flotation and separation combined unit.
Detailed Description
To further illustrate the technical means adopted by the patent and the effects thereof, the following detailed description is given in conjunction with the preferred embodiments of the patent and the accompanying drawings.
Referring to fig. 1, a coal flotation and separation integrated unit includes: cut coarse shale shaker 1, flotation mineralizer 2, flotation device I3, flotation device II4, flotation device III5, coal slime ups and downs machine 6, concentration tank 7, cut coarse shale shaker 1 and link to each other with flotation mineralizer 2, flotation mineralizer 2 links to each other with flotation device I3, flotation device II4, flotation device III5 links to each other with flotation device II4, coal slime ups and downs machine 6 respectively, flotation device I3 links to each other with concentration tank 7, coal ups and downs machine 6 respectively.
Wherein, flotation machine I3 is equipped with flotation concentrate case I8, and flotation machine I3 links to each other with flotation machine II4 through flotation concentrate case I8, flotation machine II4 is equipped with flotation concentrate case II9, flotation machine II4 links to each other with flotation machine III5 through flotation concentrate case II9, flotation machine III5 connects clean coal pressure filter feed box 10, flotation machine III5 connects the clean coal through clean coal pressure filter feed box 10 and piles the place, coal slime ups and downs 6 connects middlings pressure filter 11, and coal slime ups and downs 6 sends into the middlings through middlings pressure filter 11 and piles the place.
Further, it links to each other through the charge pump to cut coarse shale shaker 1 and flotation mineralizer 2, flotation mineralizer 2 has the height drop with flotation machine I3, mineralizes coal slime slurry or the coal slime tailing slurry after diluting in flotation mineralizer 2, and the gravity flow gets into flotation machine I3 on the basis of the drop, link to each other through the charge pump between flotation concentrate case I8 and flotation machine II4, flotation concentrate case II9 links to each other through the charge pump with flotation machine III5, there is the drop between flotation machine III5 and the coal slime ups and downs 6, and the gravity flow gets into coal slime ups and downs 6, coal slime ups and downs 6 overflow has the flotation concentrate case I8 that the gravity flow gets into flotation machine I3 on the basis that the equipment has the height drop.
According to the principle: the flotation coal is a method for selectively separating in a liquid-gas-solid three-phase interface by utilizing the surface properties of minerals, and is a separation method which is most widely applied in the separation of fine and ultra-fine materials. Modern froth flotation processes generally include: four processes of ore grinding, size mixing, flotation separation, product treatment and the like. Firstly, solid mineral particles and water form an ore pulp solution with a certain concentration, then a flotation agent is added to blend the ore pulp to increase the hydrophobicity of the surface of the mineral, and then a foaming agent is added to promote the generation and dispersion of micro-bubbles, so that the hydrophobic mineral is carried by bubbles to rise to the liquid surface of the ore pulp to form a concentrate foam layer. The traditional flotation method mainly adopts a flotation machine and a flotation column. The coal slurry with the granularity of less than 0.5mm can be treated by the coal flotation machine. However, in order to improve the separation efficiency of flotation, modern flotation processes achieve this goal by several means: (1) and (4) carrying out classified flotation, namely subdividing the coal slime smaller than 0.5mm into a plurality of grades according to the characteristics of the coal slime, and respectively treating the grades by using a separation method. (2) The 0.25mm-0.5mm size fraction is treated with a spiral classifier, while the fine fraction is treated with flotation. (3) Adding the chemicals in sections, and adding the chemicals in batches at multiple points in the flotation process.
The purpose of each component is as follows:
1. cutting coarse vibrating screen 1: the coal slurry or diluted coal slurry tailing slurry is cut off to be coarse and enters a flotation mineralizing device.
2. A flotation and mineralization device 2: adding a flotation reagent into the coal dressing slurry or the diluted coal slime tailing slurry under the pressure action of a feeding pump for mineralization.
3. A flotation machine: and carrying out flotation on the mineralized coal preparation coal slime pulp or the diluted coal slime tailing pulp.
4. Coal slime ups and downs machine 6: separating out middlings from the third flotation tailings.
5. A concentration tank 7: concentrating the flotation tailings of the first flotation machine I3, carrying out pressure filtration on the concentrated underflow by a pressure filter, sending the underflow into a tailings yard, and sending the concentrated overflow water into an internal circulating water system.
The method comprises the following operation steps: the method comprises the steps of cutting coarse particle size of coal dressing slurry or diluted coal slime tailing slurry into 0mm-0.1mm, enabling the coal dressing slurry or the diluted coal slime tailing slurry to enter a flotation mineralizing device 2 under the action of a certain pressure of a charging pump, enabling the mineralized coal slime tailing slurry to automatically flow into a first flotation machine I3 for flotation on the basis of the height of equipment with a drop, enabling first flotation clean coal to enter a flotation concentrate box I8 of a flotation machine I3 to be injected with water for dilution, enabling the first flotation tailing slurry to enter a second flotation under the action of the certain pressure of the charging pump, enabling the first flotation tailing slurry to enter a concentration tank 7 for concentration, and enabling the concentrated tailing slurry to be sent to a tailing stacking site after being subjected to filter pressing. The second flotation clean coal enters a flotation concentrate box II9 of a flotation machine II4 to be injected with water for dilution, enters third flotation under the action of a certain pressure of a feeding pump, the second flotation tailings enter a tailings box of the second flotation, under the action of a certain pressure of the feeding pump, the second flotation clean coal is mixed with mineralized materials to enter the first flotation again, the second flotation clean coal enters a flotation concentrate box II9 of a flotation machine II4 to be injected with water for dilution, and enters a flotation machine III5 under the action of a certain pressure of the feeding pump, the flotation clean coal is qualified clean coal, the third flotation tailings automatically flow into the coal slime sinking and floating machine 6 on the basis of the height difference of equipment, the coal slime sinking and floating machine 6 overflows to automatically flow into a flotation concentrate box I8 of the flotation machine I3 on the basis of the height difference of equipment, the first flotation clean coal pulp dilution is carried out, the bottom flow of the flotation machine 6 outputs the medium coal under the working principle of the coal slime sinking machine 6, and (4) carrying out filter pressing by a middling filter press 11 and then sending the middling into a middling stacking place.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall be covered by the protection scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the protection scope of the claims.
Claims (3)
1. A combined unit for coal flotation is characterized by comprising: cut coarse shale shaker, flotation mineralizer, flotation device I, flotation device II, flotation device III, coal slime ups and downs machine, concentrated pond, cut coarse shale shaker and link to each other with the flotation mineralizer, the flotation mineralizer links to each other with flotation device I, flotation device II, flotation device III links to each other with flotation device II, coal slime ups and downs machine respectively, flotation device I links to each other with concentrated pond, coal slime ups and downs machine respectively, and above-mentioned device is used for: the coarse particle size cut of coal dressing slurry or diluted coal slime tailing slurry is 0mm-0.1mm, the coal dressing slurry or the diluted coal slime tailing slurry enters a flotation mineralizing device, and the coal dressing slurry or the diluted coal slime tailing slurry enters a flotation machine I for primary flotation after mineralization; injecting water into the clean coal subjected to the first flotation, and then feeding the clean coal into a flotation machine II for second flotation; the tailing coal of the first flotation enters a concentration tank for concentration; injecting water into the clean coal subjected to the second flotation, and then performing third flotation in a flotation machine III; the tailing coal and coal slurry after the second flotation or the diluted coal slime tailing slurry with the coarse particle size fraction of 0mm-0.1mm enter a flotation mineralizing device to be mixed and enter the first flotation; the clean coal floated for the third time is qualified clean coal; and the third flotation tail coal enters a coal slime ups and downs machine, the coal slime ups and downs machine overflows and enters a primary flotation clean coal pulp box for dilution, and the bottom flow of the coal slime ups and downs machine produces middlings.
2. The combined unit of claim 1, wherein the flotation machine I is provided with a flotation concentrate box I, the flotation machine I is connected with the flotation machine II through the flotation concentrate box I, the flotation machine II is provided with a flotation concentrate box II, the flotation machine II is connected with the flotation machine III through the flotation concentrate box II, the flotation machine III is connected with a clean coal press filter feeding box, the flotation machine III is fed into the clean coal stacking field through the clean coal press filter feeding box, the coal slime sinking and floating machine is connected with a middling coal press filter, and the coal slime sinking and floating machine is fed into the middling coal stacking field through the middling coal press filter.
3. The combined unit for flotation and separation of coal as claimed in claim 1, wherein the coarse-cutting vibrating screen is connected to the flotation mineralizer through a feeding pump, the flotation mineralizer has a height drop with respect to the flotation machine I, the slurry of coal or diluted slurry of coal slurry tailings is mineralized in the flotation mineralizer, the slurry automatically flows into the flotation machine I on the basis of the height drop of the equipment, the flotation concentrate tank I is connected to the flotation machine II through the feeding pump, the flotation concentrate tank II is connected to the flotation machine III through the feeding pump, the height drop of the equipment exists between the flotation machine III and the slurry submergence machine, the slurry automatically flows into the slurry submergence machine, and the slurry submergence machine overflows and automatically flows into the flotation concentrate tank I of the flotation machine I on the basis of the height drop of the equipment.
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| CN201710331651.2A CN108855586B (en) | 2017-05-12 | 2017-05-12 | Combined unit for coal flotation |
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| CN201710331651.2A CN108855586B (en) | 2017-05-12 | 2017-05-12 | Combined unit for coal flotation |
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| CN113210133A (en) * | 2021-04-23 | 2021-08-06 | 中煤科工集团北京华宇工程有限公司 | Three-time coal flotation process |
| CN113522515A (en) * | 2021-06-17 | 2021-10-22 | 中国矿业大学 | Coal refloating process in high-ash difficult-separation coal slime |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB712104A (en) * | 1951-05-01 | 1954-07-21 | Colliery Engineering Ltd | Improvements in or relating to the separation of solid materials of different specific gravities |
| US3579442A (en) * | 1970-07-09 | 1971-05-18 | Bird Machine Co | Coal converting process |
| CN100391574C (en) * | 2006-04-25 | 2008-06-04 | 开滦精煤股份有限公司范各庄矿业分公司 | Process for dehydrating floatation coal |
| CN100571880C (en) * | 2007-03-26 | 2009-12-23 | 开滦(集团)有限责任公司煤业分公司 | A kind of process of floating tail-coal graded recovery |
| CN101757982A (en) * | 2010-03-09 | 2010-06-30 | 中国矿业大学 | Coal slime floating process |
| CN103752414A (en) * | 2014-01-07 | 2014-04-30 | 中国矿业大学(北京) | Pulp mixing reinforced deep flotation technology process |
| CN203916914U (en) * | 2014-06-24 | 2014-11-05 | 中国矿业大学 | A kind of coal slime flotation and floatation clean coal dewatering system |
| CN105597940A (en) * | 2016-01-04 | 2016-05-25 | 淮北矿业股份有限公司 | Coal dressing flotation process for coal dressing plant |
| CN105562193A (en) * | 2016-02-03 | 2016-05-11 | 山东佳星环保科技有限公司 | Flotation coal preparation method |
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Denomination of invention: A combined unit for floating coal preparation Effective date of registration: 20220126 Granted publication date: 20200821 Pledgee: Bank of China Limited Linfen branch Pledgor: Shanxi century new Longteng Technology Co.,Ltd. Registration number: Y2022140000004 |
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Denomination of invention: A combined unit for floating coal selection Granted publication date: 20200821 Pledgee: Bank of China Limited Linfen branch Pledgor: Shanxi century new Longteng Technology Co.,Ltd. Registration number: Y2024140000009 |