CN105750075A - Device for washing separation of high-ash, high-clay and high-gangue coal - Google Patents
Device for washing separation of high-ash, high-clay and high-gangue coal Download PDFInfo
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- CN105750075A CN105750075A CN201610336143.9A CN201610336143A CN105750075A CN 105750075 A CN105750075 A CN 105750075A CN 201610336143 A CN201610336143 A CN 201610336143A CN 105750075 A CN105750075 A CN 105750075A
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- coal
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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 device for washing separation of high-ash, high-clay and high-gangue coal. According to the device, raw coal enters an air dense-medium coal separator first; a three-product dense-medium cyclone is connected behind the air dense-medium coal separator, a coarse clean coal outlet of the three-product dense-medium cyclone is connected with a medium removing and water removing screen, a coarse gangue outlet is connected with another medium removing and water removing screen, and a coarse medium coal outlet is connected with dense-medium separation equipment; flotation columns, a spiral chute and a water-medium cyclone are connected behind the dense-medium separation equipment in sequence. The secondary flotation columns are used in the flotation process, and thus both high flotation efficiency and a high flotation recovery rate are achieved.
Description
The present invention is the divisional application of patent of invention " a kind of washing appliance for high grey high mud height spoil coal ", the applying date of original application is on March 10th, 2014, the application number of original application is 2014100848909, and the invention and created name of original application is " a kind of washing appliance for high grey high mud height spoil coal ".
Technical field
The present invention relates to the screening installation of coal slime, be especially adapted for use in the screening installation of the difficult separation coal mud of high grey high mud height spoil.
Background technology
Along with a large amount of excess loads of coal are exploited by China for many years, the coal resource of high-quality gets up the fewest, the former apparently lean colliery that difficult exploitation difficulty reclaims become now have to faced by mineral resources, these lean collieries have the several respects such as high mud grey, high, high spoil rate, washability difference mostly.The most particularly-200 purpose fine coal content increases, cause floatation clean coal often due to the thin mud of high ash is carried secretly and ash content is higher, coarse granule intergrowth also produces interference to floatation process, the ash content of intergrowth mineral is the most close with coal ash, ratio accounts for about the 20% of raw coal, intergrowth part is as entered cleaned coal part, then pollute cleaned coal, if intergrowth part does not reclaims, enter tail coal part, then make tail coal part on the low side, so it is that floatation feed is sent into after ore pulp preprocessor processes flotation column (or flotation device) that the sorting problem of thin sludge-polluted and intergrowth mineral has become the flotation process of the serious key factor routine restricting final head coal product quality, flotation column (or flotation device) sub-elects concentrate and tailings, and enter the process operation of respective subsequent product.This technique is primarily adapted for use in the sorting of conventional easily coal separation mud, it is widely used in China, but for high grey high mud height spoil difficult separation coal mud, there is product recovery rate and the low defect of production efficiency in this technique, it is difficult to solve the thin mud of high ash carry secretly and the impact of intergrowth Mineral pairs floatation process, therefore the key technology of the efficient separation of the adaptive high ash difficult separation coal mud height spoil rate of exploitation needs a difficult problem of solution badly during having become coal resources efficient clean utilization.
Summary of the invention
The washing appliance for high grey high mud height spoil coal in the present invention, raw coal is first selected in air dense medium coal picker by it, air dense medium coal picker is followed by three-product HM cyclone, the coarse-fine coal export of three-product HM cyclone connects de-mediated dewatering screen, thick spoil outlet connects another de-mediated dewatering screen, in thick, coal export connects dense medium screening installation, connects flotation column, spiral chute and water-only cyclone after dense medium screening installation successively.
More preferably, the coarse-fine coal export of three-product HM cyclone connects de-mediated dewatering screen, the compass screen surface of de-mediated dewatering screen is divided into three parts, compass screen surface Part I divides into conjunction Jie's bucket, the Part II and Part III sieve of compass screen surface are provided with water injector, the sieve of compass screen surface Part II divides into magnetic separator, and Part III sieve is divided into the black water that centrifuge, centrifuge and magnetic separator select and introduced fast-flotation post by pipeline.
More preferably, the thick spoil outlet of three-product HM cyclone connects another de-mediated dewatering screen, the compass screen surface of this de-mediated dewatering screen is divided into three parts, compass screen surface Part I divides into conjunction Jie's bucket, the Part II and Part III sieve of compass screen surface are provided with water injector, the sieve of compass screen surface Part II divides into magnetic separator, and Part III sieve is divided into the black water that centrifuge, centrifuge and magnetic separator select and introduced middling speed flotation column by pipeline.
More preferably, the outlet of three-product HM cyclone connects dense medium screening installation and obtains two kinds of products of weight, and light product is after dehydration de-mediated, and the qualified medium obtained enters qualified medium bucket, and the fine grained cleaned coal obtained is as final products；Weight product, after dehydration de-mediated, obtains qualified medium and enters qualified medium bucket, and the fine grained spoil obtained is as spoil, and from two kinds of products of weight, the black water of abjection is mixed into flotation flowsheet.
More preferably, described flotation flowsheet uses fast-flotation post and this secondary floatation of middling speed flotation column, the foam of secondary floatation converges for fine cleaned coal, the underflow of fast-flotation post enters middling speed flotation column, tool ultrasonic oscillation structure in middling speed flotation column, in middling speed flotation column, mine tailing enters spiral chute, and spiral chute, thickener and ore mill collectively constitute closed circuit grinding loop, after ore grinding, coal slurry returns middling speed flotation column, and the black water rich in ash and mud that spiral chute sub-elects enters charging pump.
More preferably, charging pump is connected with cloth helix tube, the outlet of cloth helix tube is connected with the feeding mouth of water-only cyclone, and the inner periphery tube wall of cloth helix tube outlet connects with the excircle tube wall of water-only cyclone feeding mouth, the excircle tube wall of cloth helix tube outlet connects with the tube wall of the side, the close center of circle of water-only cyclone feeding mouth.
More preferably, the underflow of water-only cyclone enters high frequency shale shaker, and the screenings of high frequency shale shaker enters thickener, and thickener is followed by filter press, and the recirculated water that filter press produces is reused；The overflow of water-only cyclone enters thickener, and the solid that the oversize of high frequency shale shaker and filter press sub-elect is coal slime.
Beneficial effect:
1) present invention uses air dense medium coal picker, throws the most in advance except part spoil prevents it from entering the sorting pressure of follow-up flow process enlarged rear portion equipment, does not the most introduce the use of water, not only water-saving and emission-reducing, does not the most affect the sorting of dense medium cyclone below；
2) thick middle coal is sorted the most further, i.e. sort targetedly for high grey high mud part, make the coal charge flow of whole separation system greatly reduce.Use floatation at different velocity, introduce rich coal water and meager coal water, make one-level flotation efficiently, quickly；Secondary floatation is comprehensive, thorough, the recovery coal of maximum limit, minimizing ash and the mud impact on coal flotation of minimum degree.And the method using spiral chute and closed circuit grinding makes the mineral intergrowth degree of depth dissociate, separate plaster and coal further.Use cloth helix tube that the selected black water of water-only cyclone carries out particle arrangement to control, make cyclone discharge solid as far as possible, reduce the sorting pressure to follow-up equipment.
To sum up, this technological process is reasonable, and small investment, power consumption is little, and operating cost is low.Compared with tradition sorting process, the efficiency of separation is high, remarkable in economical benefits.
Accompanying drawing explanation
Fig. 1 is the process flow system figure of the present invention.
Fig. 2 is the cloth helix tube front view with water-only cyclone of the present invention.
Fig. 3 is the top view of Fig. 2.
Detailed description of the invention
Enforcement to the present invention is further described below in conjunction with the accompanying drawings:
As it is shown in figure 1, raw coal is selected in air dense medium coal picker, air dense medium coal picker is dry type coal picker, and it uses air auto-monitor dry separation, and coal picker is mainly made up of parts such as air chamber, air distribution plate, scraping plate conveying devices.The material (raw coal) assorting room in separator is: 100 13mm grade raw coal after screening and dense media are separately added in separator simultaneously.Having the body input bottom air chamber of calming the anger of certain speed, after air distribution plate, stepless action is in dense media, forms the uniform and stable gas-solid fluidisation suspended substance with certain density.According to Archimedes' principle, light-heavy material is by density stratification in suspended substance, and light thing floats, weight sinks.The material of layering is inversely discharged from bed body by scraping plate conveying device respectively, can obtain qualified weight product after de-mediated.Utilize the discharge spoil in advance that air dense medium coal picker can be preliminary, prevent spoil from entering follow-up flow process in a large number.Air dense medium method requires that selected raw coal water content is low, and otherwise selected raw coal will block the wind distributing hole of air distribution plate.Therefore, if feed coal water content is too high, the coal that such as is produced from colliery, south, before entering air dense medium coal picker, need to carry out high wind be dried or natural drying.
The spoil that air dense medium coal picker is selected directly is abandoned, and the qualified coal selected enters three-product HM cyclone, and in use coal is fed cyclone apex by the central tube deadweight of three-product HM cyclone, and heavy-media suspension tangentially pumps into cyclone upper end.With a kind of low-density suspension, coarse-fine coal, thick middle coal and thick three kinds of products of spoil can be selected simultaneously.Air dense medium coal picker, throw except part spoil prevents it from entering the sorting pressure of follow-up flow process enlarged rear portion equipment the most in advance, the most do not introduce the use of water, not only water-saving and emission-reducing, the most do not affect the sorting of dense medium cyclone below, if using wet split before three-product HM cyclone, coal charge will contain quite a few moisture content, heavy-media suspension can be diluted when dense media separates, owing in wet split, the moisture content of coal charge is uncontrollable, therefore the sorting of heavy medium cyclone also can be greatly affected.
Coarse-fine coal enters de-mediated dewatering screen, the compass screen surface of de-mediated dewatering screen can be divided into three parts, coarse-fine coal becomes coarse granule cleaned coal the most afterwards from de-mediated dewatering screen, coarse-fine coal compass screen surface Part I deviate from for qualified medium, qualified medium is directly entered conjunction Jie's bucket, at Part II and the Part III of compass screen surface, coarse-fine coal is carried out Water spray, the screenings that Part II is taken off enters magnetic separator and selects dense media, and the screenings that Part III is taken off enters after oarse-grained coal selected by centrifuge and is incorporated to coarse granule cleaned coal.The black water that centrifuge and magnetic separator are selected carries out subsequent treatment as rich coal water.
Thick spoil is also into de-mediated dewatering screen, thick spoil becomes spoil the most afterwards from de-mediated dewatering screen, thick spoil compass screen surface Part I deviate from for qualified medium, qualified medium is directly entered conjunction Jie's bucket, Part II and Part III at compass screen surface, thick spoil is carried out Water spray, and the screenings that Part II is taken off enters magnetic separator and selects dense media, and the screenings that Part III is taken off enters after oarse-grained spoil selected by centrifuge and is incorporated to spoil.The black water that centrifuge and magnetic separator are selected carries out subsequent treatment as meager coal water.
As the washing of high grey high mud height spoil coal, what difficulty was maximum is the process to thick middle coal, in prior art, also has and directly carries out middle coal being dehydrated de-mediated, then sell as low-quality coal, and this greatly reduces the economic benefit of coal undoubtedly.In the present embodiment, thick middle coal is carried out dense medium sorting further, segment out two kinds of products of weight, light product is after dehydration de-mediated, obtaining qualified medium and enter qualified medium bucket, the thin cleaned coal obtained is as final products, and weight product is after dehydration de-mediated, obtaining qualified medium and enter qualified medium bucket, the particulate spoil obtained is as spoil.From two kinds of products of weight, the black water of abjection is mixed into flotation flowsheet.
Flotation flowsheet includes the fast-flotation in fast-flotation post and the middling speed flotation in middling speed flotation column, the flow process using this floatation at different velocity is because, high grey high mud height spoil coal is after basic discharge spoil, high ash and mud still mix with coal, if using one-level flotation column, later stage coal grain in flotation flowsheet is difficult to float, and flotation efficiency is low, and the rate of recovery is low.Described rich coal water enters fast-flotation post, improves the content of coal further, and meager coal water enters middling speed flotation column and dilutes coal content further, widens the grade gap entering coal separation of two-stage flotation the most further, according to these gaps specifically chosen use flotation agent.In middling speed flotation column, use ultrasonic oscillation structure, make the ash of high concentration and mud leave the surface of coal, so make coal easily be combined floating with the collecting agent of flotation.Secondary floatation system not only increases efficiency of separation sorting quality, also a saving medication.The foam of fast-flotation and middling speed flotation is as fine cleaned coal, in flotation column, mine tailing enters spiral chute, the mineral intergrowth of big granularity is elected by spiral chute, enter closed circuit grinding, returning middling speed flotation column after ore grinding, owing to the effect of ore grinding makes mineral intergrowth dissociate, coal grain surface is exposed, therefore can be combined with flotation agent, the ash of symbiosis therewith or mud then enter mine tailing and are again discharged.The black water rich in ash and mud that spiral chute sub-elects enters charging pump.
nullSee Fig. 2、3，The black water forced feed cloth helix tube 1 that spiral chute is sub-elected by charging pump (not shown)，Black water is due to the centrifugal motion in cloth helix tube，Coarse granule outside circumference vessel wall motion，The cross section in the exit of cloth helix tube is close at excircle tube wall be enriched with coarse granule mine tailing，And fine grained mine tailing concentrates on inner periphery tube wall side，Cloth helix tube is connected with the feeding mouth of water-only cyclone 2，And the inner periphery tube wall of cloth helix tube connects with the excircle tube wall of water-only cyclone feeding mouth，The excircle tube wall of cloth helix tube connects with the tube wall of the side, the close center of circle of water-only cyclone feeding mouth，So，After mine tailing enters water-only cyclone，Coarse granule moves to the inwall of water-only cyclone sorting chamber，In coarse granule migrates traverse，Prevent the fine grained motion to overflow pipe，Fine grained is pushed to the inwall of sorting chamber and discharges from underflow by i.e. coarse granule，The solids content that the water so flowed out from overflow pipe is mingled with greatly reduces.Reason for this is that the solid of mine tailing is sorted out by hope as far as possible; the most grey such fine particle or silt particle such moderate particle, therefore, even if the granularity of particle is uneven in black water; but through the pretreatment of cloth helix tube, substantially discharge through water-only cyclone.If without the pretreatment of cloth helix tube, the tiny ash in black water, by going out to run out of from overfall in a large number, increases the weight of the burden of thickener.
The underflow of water-only cyclone enters high frequency shale shaker, and the screenings of high frequency shale shaker enters thickener, thickener be followed by filter press, the recirculated water that filter press produces is reused.The overflow of water-only cyclone enters thickener, and the solid that the oversize of high frequency shale shaker and filter press sub-elect is coal slime.
So, after overall sorting flow process, sub-elect coarse granule cleaned coal, fine grained cleaned coal, fine cleaned coal, coal slime and spoil, effectively eliminate high grey and high coal and the impact on readymade coal of the spoil composition.
Although the washing process of the disclosed a kind of high ash high mud height spoil coal related to being particularly described with reference to embodiment; embodiments described above is illustrative and not restrictive; without departing from the present invention, all of change and modifications all within protection scope of the present invention.
Claims (4)
1. the device for the washing of high grey high mud height spoil coal, it is characterized in that: raw coal is first selected in air dense medium coal picker, air dense medium coal picker is followed by three-product HM cyclone, the coarse-fine coal export of three-product HM cyclone connects de-mediated dewatering screen, thick spoil outlet connects another de-mediated dewatering screen, in thick, coal export connects dense medium screening installation, connects fast-flotation post, middling speed flotation column, spiral chute and water-only cyclone after dense medium screening installation successively；
The coarse-fine coal export of three-product HM cyclone connects de-mediated dewatering screen, the compass screen surface of de-mediated dewatering screen is divided into three parts, compass screen surface Part I divides into qualified medium bucket, the Part II and Part III sieve of compass screen surface are provided with water injector, the sieve of compass screen surface Part II divides into magnetic separator, Part III sieve is divided into the black water that centrifuge, centrifuge and magnetic separator select and is introduced fast-flotation post by pipeline；
Charging pump is connected with cloth helix tube, the outlet of cloth helix tube is connected with the feeding mouth of water-only cyclone, and the inner periphery tube wall of cloth helix tube outlet connects with the excircle tube wall of water-only cyclone feeding mouth, the excircle tube wall of cloth helix tube outlet connects with the tube wall of the side, the close center of circle of water-only cyclone feeding mouth；
The underflow of water-only cyclone enters high frequency shale shaker, and the screenings of high frequency shale shaker enters thickener, and thickener is followed by filter press, and the recirculated water that filter press produces is reused；The overflow of water-only cyclone enters thickener, and the solid that the oversize of high frequency shale shaker and filter press sub-elect is coal slime.
Equipment the most according to claim 1, it is characterized in that: the thick spoil outlet of three-product HM cyclone connects another de-mediated dewatering screen, the compass screen surface of this de-mediated dewatering screen is divided into three parts, compass screen surface Part I divides into qualified medium bucket, the Part II and Part III sieve of compass screen surface are provided with water injector, the sieve of compass screen surface Part II divides into magnetic separator, and Part III sieve is divided into the black water that centrifuge, centrifuge and magnetic separator select and introduced middling speed flotation column by pipeline.
3. according to the equipment described in claim 1 and 2, it is characterized in that: the thick middle coal export of three-product HM cyclone connects dense medium screening installation and obtains two kinds of products of weight, light product is after dehydration de-mediated, and the qualified medium obtained enters qualified medium bucket, and the fine grained cleaned coal obtained is as final products；Weight product, after dehydration de-mediated, obtains qualified medium and enters qualified medium bucket, and the fine grained spoil obtained is as spoil, and from two kinds of products of weight, the black water of abjection is mixed into the fast-flotation post of flotation flowsheet.
4. according to the equipment described in claim 1-3 any one, it is characterized in that: described flotation flowsheet uses fast-flotation post and this secondary floatation of middling speed flotation column, the foam of secondary floatation converges for fine cleaned coal, the underflow of fast-flotation post enters middling speed flotation column, there is in middling speed flotation column ultrasonic oscillation structure, in middling speed flotation column, mine tailing enters spiral chute, spiral chute, thickener and ore mill collectively constitute closed circuit grinding loop, after ore grinding, coal slurry returns middling speed flotation column, and the black water rich in ash and mud that spiral chute sub-elects enters charging pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610336143.9A CN105750075A (en) | 2014-03-10 | 2014-03-10 | Device for washing separation of high-ash, high-clay and high-gangue coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610336143.9A CN105750075A (en) | 2014-03-10 | 2014-03-10 | Device for washing separation of high-ash, high-clay and high-gangue coal |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410084890.9A Division CN103785529B (en) | 2014-03-10 | 2014-03-10 | A kind of washing appliance for high grey high mud height spoil coal |
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| Publication Number | Publication Date |
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| CN105750075A true CN105750075A (en) | 2016-07-13 |
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| CN201610336143.9A Withdrawn CN105750075A (en) | 2014-03-10 | 2014-03-10 | Device for washing separation of high-ash, high-clay and high-gangue coal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106984427A (en) * | 2017-04-10 | 2017-07-28 | 拜城县众泰煤焦化有限公司 | A kind of coal preparation plant's sorting automatically controls process unit and method |
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