CN105344462A - Washing process for high-ash high-mud high-gangue coal - Google Patents
Washing process for high-ash high-mud high-gangue coal Download PDFInfo
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- CN105344462A CN105344462A CN201510625366.2A CN201510625366A CN105344462A CN 105344462 A CN105344462 A CN 105344462A CN 201510625366 A CN201510625366 A CN 201510625366A CN 105344462 A CN105344462 A CN 105344462A
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- spoil
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- 239000003245 coal Substances 0.000 title claims abstract description 132
- 238000005406 washing Methods 0.000 title claims abstract description 13
- 238000005188 flotation Methods 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 25
- 230000001404 mediated effect Effects 0.000 claims description 20
- 239000010866 blackwater Substances 0.000 claims description 16
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 9
- 239000011707 mineral Substances 0.000 claims description 9
- 230000018044 dehydration Effects 0.000 claims description 7
- 238000006297 dehydration reaction Methods 0.000 claims description 7
- 239000006260 foam Substances 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 4
- 239000002956 ash Substances 0.000 description 16
- 239000004744 fabric Substances 0.000 description 14
- 239000008187 granular material Substances 0.000 description 12
- 238000012216 screening Methods 0.000 description 12
- 239000006148 magnetic separator Substances 0.000 description 7
- 239000002562 thickening agent Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000008396 flotation agent Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011027 product recovery Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 230000031068 symbiosis, encompassing mutualism through parasitism Effects 0.000 description 1
Classifications
-
- 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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- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
The invention provides a washing process for high-ash high-mud high-gangue coal. A high-ash high-mud part is separated in a targeted mode, so that the coal material flow of a whole separation system is greatly reduced. Flotation at different velocities is adopted, coal-rich water and coal-meager water are led in, and primary flotation is made efficient and rapid; secondary flotation is made comprehensive and thorough, coal is recovered to the maximum extent, and the influence of ash and mud on coal flotation is reduced to the maximum extent. Moreover, paragenic ore is made to be deeply dissociated through a spiral chute and a closed circuit grinding method, and therefore the ash and the mud are further separated from the coal.
Description
The present invention is the divisional application of patent of invention " a kind of washing process for the grey high mud height spoil coal of height ", the applying date of original application is on March 10th, 2014, the application number of original application is 2014100848913, and the invention and created name of original application is " a kind of washing process for the grey high mud height spoil coal of height.
Technical field
The present invention relates to the sorting process of coal slime, be especially applicable to the sorting process of the difficult separation coal mud of high grey high mud height spoil.
Background technology
Along with China is for many years to a large amount of excess load exploitations of coal, the coal resource of high-quality gets up fewer, former it seems the difficult meager coal ore deposit of reclaiming of difficult exploitation become now must faced by mineral resources, these meager coal ore deposits have the several respects such as high ash, high mud, high spoil rate, washability difference mostly.Wherein particularly the fine coal content of-200 object increases, cause floatation clean coal often because 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 general and coal ash is close, ratio accounts for about 20% of raw coal, intergrowth part is as entered cleaned coal part, then pollute cleaned coal, if intergrowth part does not reclaim, enter tail coal part, then make tail coal part on the low side, so the flotation process that the sorting problem of thin sludge-polluted and intergrowth mineral has become the key factor routine of the final head coal product quality of serious restriction is that floatation feed is sent into flotation column (or flotation device) after the process of ore pulp preprocessor, flotation column (or flotation device) sub-elects concentrate and tailings, and enter respective subsequent product processing operation.This technique is mainly applicable to the sorting of conventional easily coal separation mud, be widely used in China, but for the grey high mud height spoil difficult separation coal mud of height, there is product recovery rate and the low defect of production efficiency in this technique, be difficult to solve the thin mud of high ash and carry the impact with intergrowth Mineral pairs floatation process secretly, therefore the key technology of the efficient separation of the adaptive high grey difficult separation coal mud height spoil rate of exploitation becomes in coal resources efficient clean utilization process the difficult problem needing solution badly.
Summary of the invention
The washing process for the grey high mud height spoil coal of height in the present invention, raw coal is first selected in air dense medium coal picker and throws spoil in advance, enter three-product HM cyclone again and obtain thick cleaned coal, coal in thick, thick spoil, thick cleaned coal enters de-mediated dewatering screen and obtains coarse granule cleaned coal, and thick spoil enters de-mediated dewatering screen and obtains spoil, and thick middle coal carries out gravity treatment and flotation obtains fine grained cleaned coal, fine cleaned coal and coal slime.
Be more preferably, thick cleaned coal enters de-mediated dewatering screen, the compass screen surface of de-mediated dewatering screen is divided into three parts, thick cleaned coal from de-mediated dewatering screen out after oversize become coarse granule cleaned coal, thick cleaned coal is qualified medium at the screenings that compass screen surface Part I is deviate from, qualified medium directly enters and closes Jie's bucket, at the Part II of compass screen surface and Part III, Water spray is carried out to thick cleaned coal, the screenings that Part II is taken off enters magnetic separator and selects dense media, 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.
Be more preferably, thick spoil enters de-mediated dewatering screen, thick spoil from de-mediated dewatering screen out after oversize become spoil, thick spoil compass screen surface Part I deviate from for qualified medium, qualified medium directly enters and closes Jie's bucket, at Part II and the Part III of compass screen surface, Water spray is carried out to thick spoil, the screenings that Part II is taken off enters magnetic separator and selects dense media, the screenings that Part III is taken off enters centrifuge and selects bulky grain and be more preferably, thick middle coal is carried out dense medium sorting further and obtains weight two kinds of products, light product is after dehydration de-mediated, the qualified medium obtained enters qualified medium bucket, the fine grained cleaned coal obtained is as final products, heavy product is after dehydration de-mediated, and obtain qualified medium and enter qualified medium bucket, the fine grained spoil obtained is as spoil, and the black water deviate from from weight two kinds of products is mixed into flotation flowsheet.
Be more preferably, described flotation flowsheet comprises the fast-flotation in fast-flotation post and the middling speed flotation in middling speed flotation column, rich coal water enters fast-flotation post, and meager coal water enters middling speed flotation column, ultrasonic oscillation structure is used in middling speed flotation column, the ash of high concentration and mud is made to leave the surface of coal, the foam of fast-flotation and middling speed flotation is as fine cleaned coal, in middling speed flotation column, mine tailing enters spiral chute, coarsegrain mineral intergrowth is elected by spiral chute, enter closed circuit grinding, middling speed flotation column is returned after ore grinding, the black water of what spiral chute sub-elected be rich in ash and mud enters charging pump.
Be more preferably, the black water forced feed cloth helix tube that spiral chute sub-elects by charging pump, 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.
Be more preferably, the underflow of water-only cyclone enters high frequency shale shaker, and the screenings of high frequency shale shaker enters thickener, connects filter press after thickener, and the recirculated water that filter press is produced 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) the present invention uses air dense medium coal picker, not only throws except part spoil prevents it from entering the sorting pressure of follow-up flow process enlarged rear portion equipment in advance, does not also introduce the use of water, not only water-saving and emission-reducing, also do not affect the sorting of dense medium cyclone below;
2) sorting further is targetedly carried out to thick middle coal, namely for the sorting targetedly of the grey high mud part of height, the coal charge flow of whole separation system is greatly reduced.Use floatation at different velocity, introduce rich coal water and meager coal water, make one-level flotation efficient, quick; Comprehensively, thoroughly, the recovery coal of maximum limit, the minimizing ash of minimum degree and mud are on the impact of coal flotation for secondary floatation.And use the method for spiral chute and closed circuit grinding that the mineral intergrowth degree of depth is dissociated, be separated plaster and coal further.Use the selected black water of cloth helix tube to water-only cyclone to carry out particle arrangement to control, make cyclone discharge solid as much 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.Compare with traditional sorting process, the efficiency of separation is high, remarkable in economical benefits.
Accompanying drawing explanation
Fig. 1 is process flow system figure of the present invention.
Fig. 2 is the front view of cloth helix tube of the present invention and water-only cyclone.
Fig. 3 is the top view of Fig. 2.
Detailed description of the invention
Below in conjunction with accompanying drawing, enforcement of the present invention is further described:
As 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 adopts air auto-monitor dry separation, and coal picker is primarily of part compositions such as air chamber, air distribution plate, scraping plate conveying devices.Material (raw coal) assorting room in separator is: 100 13mm grade raw coal after screening and dense media add in separator simultaneously respectively.Have 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, respectively by scraping plate conveying device reverse discharge from bed body, can obtain qualified weight product after de-mediated.Utilize the spoil of discharge 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, otherwise the wind distributing hole air distribution plate blocks by selected raw coal.Therefore, if feed coal water content is too high, the coal that is produced from such as southern colliery, needs to carry out high wind drying or natural drying before entering air dense medium coal picker.
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 feeds cyclone apex by the central tube deadweight of three-product HM cyclone, and heavy-media suspension tangentially pumps into cyclone upper end.With the low-density suspension of one, thick cleaned coal, thick middle coal and thick spoil three kinds of products can be selected simultaneously.Air dense medium coal picker, not only throw in advance except part spoil prevents it from entering the sorting pressure of follow-up flow process enlarged rear portion equipment, also do not introduce the use of water, not only water-saving and emission-reducing, also do not affect the sorting of dense medium cyclone below, if used 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 is separated, because in wet split, the moisture content of coal charge is uncontrollable, therefore the sorting of heavy medium cyclone also can be greatly affected.
Thick cleaned coal enters de-mediated dewatering screen, the compass screen surface of de-mediated dewatering screen can be divided into three parts, thick cleaned coal out becomes coarse granule cleaned coal afterwards from de-mediated dewatering screen, thick cleaned coal compass screen surface Part I deviate from for qualified medium, qualified medium directly enters and closes Jie's bucket, at Part II and the Part III of compass screen surface, Water spray is carried out to thick cleaned coal, 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 also enters de-mediated dewatering screen, thick spoil out becomes spoil afterwards from de-mediated dewatering screen, thick spoil compass screen surface Part I deviate from for qualified medium, qualified medium directly enters and closes Jie's bucket, at Part II and the Part III of compass screen surface, carry out Water spray to thick spoil, 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 the grey high mud height spoil coal of height, the process that what difficulty was maximum is to coal in thick, in prior art, also have and middle coal is directly carried out dehydration de-mediated, then sell as low-quality coal, 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 weight two kinds of products, light product is after dehydration de-mediated, obtain qualified medium and enter qualified medium bucket, the thin cleaned coal obtained is as final products, and heavy product is after dehydration de-mediated, obtain qualified medium and enter qualified medium bucket, the particulate spoil obtained is as spoil.The black water deviate from from weight two kinds of products is mixed into flotation flowsheet.
Flotation flowsheet comprises the fast-flotation in fast-flotation post and the middling speed flotation in middling speed flotation column, adopt the flow process of this floatation at different velocity be because, high grey high mud height spoil coal is after basic discharge spoil, high ash and mud still mix with coal, if adopt one-level flotation column, be difficult to float at the later stage coal grain of flotation flowsheet, flotation efficiency is low, and the rate of recovery is low.Described Fu Meishui enters fast-flotation post, improves further the content of coal, 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 so further, according to the concrete choice for use flotation agent of these gaps.In middling speed flotation column, use ultrasonic oscillation structure, make the ash of high concentration and mud leave the surface of coal, make coal easily be combined with the collecting agent of flotation like this and float.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 coarsegrain is elected by spiral chute, enter closed circuit grinding, return middling speed flotation column after ore grinding, the effect due to ore grinding makes mineral intergrowth dissociate, and coal grain surface is exposed, therefore can be combined with flotation agent, the ash of symbiosis with it or mud then enter mine tailing and are again discharged.The black water of what spiral chute sub-elected be rich in ash and mud enters charging pump.
See Fig. 2, 3, the black water forced feed cloth helix tube 1 that spiral chute sub-elects by charging pump (not shown), black water is due to the centrifugal motion in cloth helix tube, the outside circumference tube wall motion of coarse granule, the cross section in the exit of cloth helix tube is close to excircle tube wall place's enrichment 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, like this, after mine tailing enters water-only cyclone, coarse granule moves to the inwall of water-only cyclone sorting chamber, in coarse granule migration traverse, prevent fine grained to the motion of overflow pipe, namely fine grained is pushed to the inwall of sorting chamber and is discharged from underflow by coarse granule, the solids content that the water flowed out from overflow pipe is like this mingled with greatly reduces.The reason done like this wishes to be sorted out by the solid of mine tailing as much as possible; no matter be the such fine particle of ash or the such moderate particle of silt 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, connects filter press after thickener, and the recirculated water that filter press is produced 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.
Like this, 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 ash and high coal and spoil composition to the impact of readymade coal.
Although carried out special description with reference to the washing process of embodiment to the disclosed a kind of high ash high mud height spoil coal related to; embodiment described above is illustrative and not restrictive; without departing from the present invention, all changes and amendment are all within protection scope of the present invention.
Claims (4)
1. the washing process for the grey high mud height spoil coal of height, comprise coal washing flow process, flotation flowsheet, it is characterized in that: described flotation flowsheet comprises the fast-flotation in fast-flotation post and the middling speed flotation in middling speed flotation column, the Fu Meishui that coal washing flow process produces enters fast-flotation post, and meager coal water enters middling speed flotation column, in middling speed flotation column, use ultrasonic oscillation structure, make the ash of high concentration and mud leave the surface of coal.
2. the grey high mud height spoil coal of height according to claim 1, it is characterized in that: the foam of fast-flotation and middling speed flotation is as fine cleaned coal, in middling speed flotation column, mine tailing enters spiral chute, coarsegrain mineral intergrowth is elected by spiral chute, enter closed circuit grinding, return middling speed flotation column after ore grinding, the black water of what spiral chute sub-elected be rich in ash and mud enters charging pump.
3. the grey high mud height spoil coal of height according to claim 1, the black water that the thick cleaned coal de-mediated dehydration in coal washing flow process produces is as rich coal water.
4. the grey high mud height spoil coal of height according to claim 1, the black water that the thick spoil de-mediated dehydration in coal washing flow process produces is as rich coal water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510625366.2A CN105344462B (en) | 2014-03-10 | 2014-03-10 | A kind of washing process for the high high high spoil coal of mud of ash |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510625366.2A CN105344462B (en) | 2014-03-10 | 2014-03-10 | A kind of washing process for the high high high spoil coal of mud of ash |
| CN201410084891.3A CN103785530B (en) | 2014-03-10 | 2014-03-10 | A kind of washing process for the grey high mud height spoil coal of height |
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| CN201410084891.3A Division CN103785530B (en) | 2014-03-10 | 2014-03-10 | A kind of washing process for the grey high mud height spoil coal of height |
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| CN105344462A true CN105344462A (en) | 2016-02-24 |
| CN105344462B CN105344462B (en) | 2017-12-19 |
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| CN201510625411.4A Active CN105126994B (en) | 2014-03-10 | 2014-03-10 | A kind of washing appliance for the high high high spoil coal of mud of ash |
| CN201510625366.2A Active CN105344462B (en) | 2014-03-10 | 2014-03-10 | A kind of washing process for the high high high spoil coal of mud of ash |
| CN201510625364.3A Active CN105170306B (en) | 2014-03-10 | 2014-03-10 | A kind of washing process for the high high high spoil coal of mud of ash |
| CN201410084891.3A Active CN103785530B (en) | 2014-03-10 | 2014-03-10 | A kind of washing process for the grey high mud height spoil coal of height |
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| CN201510625364.3A Active CN105170306B (en) | 2014-03-10 | 2014-03-10 | A kind of washing process for the high high high spoil coal of mud of ash |
| CN201410084891.3A Active CN103785530B (en) | 2014-03-10 | 2014-03-10 | A kind of washing process for the grey high mud height spoil coal of height |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103934098A (en) * | 2014-05-15 | 2014-07-23 | 华东理工大学 | High-carbon pulverized coal ash/coal slag decarbonization and classification method and device |
| CN104148164B (en) * | 2014-07-04 | 2016-09-21 | 中国海洋石油总公司 | A kind of method utilizing carbon dioxide to carry out coal washing |
| CN109701732B (en) * | 2019-01-14 | 2020-09-08 | 乌拉特中旗毅腾矿业有限责任公司 | Clean utilization production method of clean coal |
| CN110193421B (en) * | 2019-06-13 | 2021-04-20 | 华北理工大学 | Coarse slime beneficiation process adopting gravity-flotation combined separation |
| CN110773309B (en) * | 2019-11-29 | 2024-06-21 | 西安科技大学 | Spiral type multi-product cyclone |
| CN111185299B (en) * | 2020-03-09 | 2022-08-05 | 四川绿矿环保科技有限公司 | Production process method for recycling coal gangue |
| 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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Also Published As
| Publication number | Publication date |
|---|---|
| CN105344462B (en) | 2017-12-19 |
| CN103785530B (en) | 2016-01-20 |
| CN105126994A (en) | 2015-12-09 |
| CN105126994B (en) | 2017-12-19 |
| CN103785530A (en) | 2014-05-14 |
| CN105170306B (en) | 2017-12-05 |
| CN105170306A (en) | 2015-12-23 |
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Effective date of registration: 20201202 Address after: No.8, Qiaoxing Road, Yunxiao County, Zhangzhou City, Fujian Province Patentee after: Yunxiao Food Inspection Center Address before: 324000 Zhejiang city of Quzhou province Quzhou green industrial agglomeration area WITHUB industrial design Industrial Park triumph Road No. 6 Building 2 3-207 Patentee before: QUZHOU YIFAN DESIGN Co.,Ltd. |
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Application publication date: 20160224 Assignee: Yunxiao County Quality Metrology Inspection and Testing Institute Assignor: Yunxiao Food Inspection Center Contract record no.: X2023980051987 Denomination of invention: A washing process for high ash, high mud, and high gangue coal Granted publication date: 20171219 License type: Common License Record date: 20240202 |
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