CN103623932A - High-pressure roller final grinding and screening method of middling coal - Google Patents
High-pressure roller final grinding and screening method of middling coal Download PDFInfo
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- CN103623932A CN103623932A CN201310585842.3A CN201310585842A CN103623932A CN 103623932 A CN103623932 A CN 103623932A CN 201310585842 A CN201310585842 A CN 201310585842A CN 103623932 A CN103623932 A CN 103623932A
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- 239000003245 coal Substances 0.000 title claims abstract description 135
- 238000000227 grinding Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012216 screening Methods 0.000 title abstract 2
- 238000003756 stirring Methods 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000005188 flotation Methods 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 239000004088 foaming agent Substances 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical group CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 8
- 239000002283 diesel fuel Substances 0.000 claims description 8
- 239000003350 kerosene Substances 0.000 claims description 8
- 239000012716 precipitator Substances 0.000 claims description 7
- 238000010926 purge Methods 0.000 claims description 7
- 238000004513 sizing Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- WVYWICLMDOOCFB-UHFFFAOYSA-N 4-methyl-2-pentanol Chemical group CC(C)CC(C)O WVYWICLMDOOCFB-UHFFFAOYSA-N 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010494 dissociation reaction Methods 0.000 abstract description 4
- 230000005593 dissociations Effects 0.000 abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 2
- 239000011707 mineral Substances 0.000 abstract description 2
- 239000000428 dust Substances 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 230000002000 scavenging effect Effects 0.000 abstract 1
- 238000013467 fragmentation Methods 0.000 description 15
- 238000006062 fragmentation reaction Methods 0.000 description 15
- 238000004939 coking Methods 0.000 description 8
- 239000003921 oil Substances 0.000 description 7
- 238000005406 washing Methods 0.000 description 6
- 239000002817 coal dust Substances 0.000 description 5
- 239000002802 bituminous coal Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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Abstract
The invention discloses a high-pressure roller final grinding and screening method of middling coal, and belongs to the technical field of mineral processing. The method comprises the following steps that (1) the middling coal is crushed to be below the upper limit of the grinding particle size of a final grinding system; (2) the work parameters of a high-pressure roller mill are set, after the high-pressure roller mill idles normally, the rotating speed of a feeding belt, the rotating speed of a V type powder concentrator rotor and the rotating speed of a dust collector are set, then a spiral conveyer is started and materials are fed into a high-pressure roller mill hopper in sequence, a roller press flap valve is opened, and a high-pressure roller final grinding experiment is carried out; (3) water is added to high-pressure roller final grinding products for size mixing and stirring, the high-pressure roller final grinding products with the water are fed into flotation equipment, collecting agents and foaming agents are added in sequence to carry out roughing, fine selection and scavenging once, and flotation clean coal and flotation tailing are obtained. Compared with a traditional method that flotation is carried out after the middling coal is crushed and ball-milled, the dissociation degree of the products is high, the follow-up flotation effect is good, and coal resources are fully and reasonably recycled and used.
Description
Technical field
The invention belongs to technical field of mineral processing, particularly the whole grinding of a kind of high pressure roller of middle coal and method for separating.
Background technology
Coal is that China's distribution is the widest, in the national economy and social development of energy resources ， China that reserves are maximum, occupies extremely important status.Although there are abundant coal resources in China, coal kind and distributed number thereof are extremely uneven, and the main coking coal such as rich coal, coking coal, lean coal is rare.According to statistics, except brown coal account for proved reserves 12.7%, in hard coal, lower-grade metamorphic bituminous proportion is total amount 42.4%, meager coal and anthracite account for 17.3%.The negligible amounts of mesometamorphism bituminous coal, only accounts for 27.6%, and is mostly bottle coal, accounts for 46.9% of mesometamorphism bituminous coal.Rich coal, coking coal, lean coal are less, account for respectively 13.6%, 24.3% and 15.1% of mesometamorphism bituminous coal.At present, the middle coal of China coking coal coal preparation plant is almost all as fuel, and this is the significant wastage to the rare coal of China beyond doubt.
Equally, in thermal coal, also contain a large amount of locked middlingses, after washing, also can produce a large amount of middle coals.When in handle, coal is directly as fuel, unfavorable to boiler operatiopn, except boiler efficiency reduces, also occur that boiler temperature obviously declines and combustion instability, the phenomenons such as slag tap deterioration, reduce reliability and the economy of boiler operatiopn significantly, increase heavy oil combustion amount.Thereby reduced generating efficiency, increased cost of electricity-generating, contaminated environment, has caused the waste of resource.Therefore, the efficient method for separating of R and D, in enforcement, coal selects again, significant to reasonable utilization and the environmental protection of coal resources in China.
High-pressure roller mill is the how broken main flow of grinding less technology and selective crushing technology development of at present domestic and international ore dressing field.High-pressure roller mill is a kind of New Grinding Devices based on the design of bed of material pulverization principle, and the principal character that the bed of material is pulverized is: crushed work pressure is large, and granule interior is cracked, and has certain selective pulverization, can improve the dissociation degree of product.Other advantage can be summarized as: disposal ability is large; Unit is low in energy consumption, approximately lower by 20% ~ 50% than gyratory crusher, jaw crusher, rod mill; Floor space is few, equipment operation rate is high.
The whole grinding of high pressure roller is a kind of grinding process that is suitable for follow-up separation that ore is directly crushed to, and has cancelled the ball mill in grinding process.Its energy-saving and cost-reducing effect is maximum, can reach 40% ~ 50%, energy-saving effect highly significant.
Summary of the invention
The problem existing for above-mentioned prior art, the invention provides a kind of whole grinding of high pressure roller and method for separating of middle coal, can improve the dissociation degree of milling product, the washability of middle coal after raising comminution, realize and reduce grinding energy simultaneously, reach the efficient utilization of coal resources.
The whole grinding of high pressure roller and the method for separating of a kind of middle coal of the present invention, carry out according to following steps:
(1) middle coal is crushed to below the mill feed size that is suitable for high pressure roller final grinding system;
(2) running parameter of high-pressure roller mill is set: high pressure roller mill technique is opened a way completely or is with rim charge circulation, and roll gap pressure is 3 ~ 6MPa, and roller speed is 10 ~ 30r/min, and roll gap is 2 ~ 5mm; After high-pressure roller mill idle running is normal, the rotating speed of setting feeding belt is 0.25 ~ 1m/s, the rotating speed of V-type rotor of powder separator is 50 ~ 500r/min, the rotating speed of dust-precipitator is 1000 ~ 3000r/min, then open successively conveying worm, material is fed to high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjust feeding belt rotating speed to feeding coal and equate with load;
(3) the whole ground prod of high pressure roller is added to the water stirring of sizing mixing, then feed in floatation equipment, first add collecting agent to stir 3min, the addition of collecting agent is 400 ~ 1000g/t, then add foaming agent to stir 1min, the addition of foaming agent is 40 ~ 100g/t, roughly selects 3 ~ 4min, obtains thick cleaned coal; Then add collecting agent to stir 3min, the addition of collecting agent is 200 ~ 500g/t, then adds foaming agent to stir 1min, and the addition of foaming agent is 20 ~ 50g/t, carries out once purging selection 3min; Thick cleaned coal is carried out to primary cleaning 2min, obtain cleaned coal; Scanning cleaned coal and selected tail coal mixes to turn back to and roughly selects.
In described step (1), raw coal disintegrating apparatus is selected jaw crusher, gyratory crusher or high-pressure roller mill.
In described step (1), the mill feed size of high pressure roller final grinding system is 10 ~ 50mm.
In described step (3), floatation equipment is flotation device or flotation column.
In described step (3), collecting agent is that kerosene is or/and diesel oil.
In described step (3), foaming agent is terpenic oil, secondary octanol or methyl isobutyl carbinol (MIBC).
The whole grinding of high pressure roller and the method for separating of a kind of middle coal of the present invention, with middle coal tradition broken with ball milling after carry out sorting and compare, energy conservation and consumption reduction effects is remarkable, product dissociation degree is high, and follow-up flotation effect is good, has improved the sharpness of separation of equipment, guaranteeing under the prerequisite of quality of cleaned coal, can improve clean coal yield, make coal resources obtain fully, reasonably reclaiming and utilizing, reduce the waste of resource.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the inventive method;
Fig. 2 is the equipment contact figure of final grinding system of the present invention, and wherein 1 is feed bin, and 2 is feeding belt, and 3 is bucket elevator, and 4 is hopper, and 5 is roll squeezer, and 6 is beater, and 7 is bucket elevator, and 8 is V-type powder concentrator, and 9 is rotoclone collector, and 10 is conveying worm;
Fig. 3 is the process chart of the embodiment of the present invention 1.
The specific embodiment
In the embodiment of the present invention, chemical reagent used is commercial.
embodiment 1
Middle coal is coal in the washing of coking coal coal washery, and granularity is less than 200mm, and ash content is 24.00%.After adopting high pressure roller final grinding system centering coal dust mill, carry out flotation, processing step is as follows:
(1) in, coal adopts gyratory crusher to carry out fragmentation, and the sieve that the product application sieve aperture after fragmentation is 30mm sieves, and on-the-sieve material turns back to gyratory crusher and carries out fragmentation, and undersize material enters feed bin;
(2) running parameter of high-pressure roller mill is set, high pressure roller is pulverized open circuit completely, and roll gap pressure is 6.0MPa, and roller speed is 10r/min, and roll gap is 3mm.After high-pressure roller mill idle running is normal, set the rotating speed 0.25m/s of feeding belt, the rotating speed 50r/min of V-type rotor of powder separator, the rotating speed 3000r/min of dust-precipitator, then open successively conveying worm, material is fed to high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjust feeding belt rotating speed to feeding coal and equate with load;
(3) the whole ground prod of high pressure roller is added to water stirrings of sizing mixing, then feeds in floatation equipment, first add diesel oil 800g/t to stir 3min, then add secondary octanol 80g/t stirring 1min,, roughly select 4min, obtain thick cleaned coal; Then add diesel oil 400g/t to stir 3min,, then add secondary octanol 40g/t to stir 1min, carry out once purging selection 3min; Thick cleaned coal is carried out to primary blank selected, obtain cleaned coal; Scanning cleaned coal and selected tail coal mixes to turn back to and roughly selects.
The productive rate of cleaned coal is 57.90%, and ash content is 8.28%; The productive rate of tail coal is 42.10%, and ash content is 45.62%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal can improve 1.57%, and ash content reduces by 0.78%.
embodiment 2
Middle coal is coal in the washing of coking coal coal washery, and granularity is less than 50mm, and ash content is 39.05%.After adopting high pressure roller final grinding system centering coal dust mill, carry out flotation, processing step is as follows:
(1) in, coal adopts high-pressure roller mill to carry out fragmentation, and the sieve that the product application sieve aperture after fragmentation is 10mm sieves, and on-the-sieve material turns back to high-pressure roller mill and carries out fragmentation, and undersize material enters feed bin;
(2) running parameter of high-pressure roller mill is set, high pressure roller is pulverized open circuit completely, and roll gap pressure is 3.0MPa, and roller speed is 20r/min, and roll gap is 2mm.After high-pressure roller mill idle running is normal, set the rotating speed 0.5m/s of feeding belt, the rotating speed 200r/min of V-type rotor of powder separator, the rotating speed 3000r/min of dust-precipitator, then open successively conveying worm, material is fed to high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjust feeding belt rotating speed to feeding coal and equate with load;
(3) the whole ground prod of high pressure roller is added to water stirrings of sizing mixing, then feed in floatation equipment, first add kerosene 400g/t to stir 3min, then add 40g/t terpenic oil, stirring 1min, roughly selects 4min, obtains thick cleaned coal; Then add kerosene 200g/t to stir 3min, then add terpenic oil 20g/t to stir 1min, carry out once purging selection 3min; Thick cleaned coal is carried out to primary blank selected, obtain cleaned coal; Scanning cleaned coal and selected tail coal mixes to turn back to and roughly selects.
The productive rate of cleaned coal is 44.66%, and ash content is 13.43%; The productive rate of tail coal is 55.34%, and ash content is 59.73%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal can improve 2.57%, and ash content reduces by 0.86%.
embodiment 3
Middle coal is coal in the washing of coking coal coal washery, and granularity is less than 50mm, and ash content is 21.84%.After adopting high pressure roller final grinding system centering coal dust mill, carry out flotation, processing step is as follows:
(1) in, coal adopts jaw crusher to carry out fragmentation, and the sieve that the product application sieve aperture after fragmentation is 20mm sieves, and on-the-sieve material turns back to jaw crusher and carries out fragmentation, and undersize material enters feed bin;
(2) running parameter of high-pressure roller mill is set, high pressure roller is pulverized the circulation of band rim charge, and roll gap pressure is 4.0MPa, and roller speed is 30r/min, and roll gap is 3mm.After high-pressure roller mill idle running is normal, set the rotating speed 0.25m/s of feeding belt, the rotating speed 300r/min of V-type rotor of powder separator, the rotating speed 1000r/min of dust-precipitator, then open successively conveying worm, material is fed to high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjust feeding belt rotating speed to feeding coal and equate with load;
(3) the whole ground prod of high pressure roller is added to water stirrings of sizing mixing, then feed in floatation equipment, first add diesel oil 300g/t and kerosene 100g/t to stir 3min, then add methyl isobutyl carbinol 60g/t stirring 1min, roughly select 3min, obtain thick cleaned coal; Then add diesel oil 150g/t and kerosene 50g/t to stir 3min; Add again methyl isobutyl carbinol 30g/t to stir 1min, carry out once purging selection 3min; Thick cleaned coal is carried out to primary blank selected, obtain cleaned coal; Scanning cleaned coal and selected tail coal mixes to turn back to and roughly selects.
The productive rate of cleaned coal is 58.70%, and ash content is 6.72%; The productive rate of tail coal is 41.30%, and ash content is 43.33%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal can improve 0.97%, and ash content reduces by 1.12%.
embodiment 4
Middle coal is coal in the washing of coking coal coal washery, and granularity is less than 50mm, and ash content is 26.03%.After adopting high pressure roller final grinding system centering coal dust mill, carry out flotation, processing step is as follows:
(1) in, coal adopts jaw crusher to carry out fragmentation, and the sieve that the product application sieve aperture after fragmentation is 20mm sieves, and on-the-sieve material turns back to jaw crusher and carries out fragmentation, and undersize material enters feed bin;
(2) running parameter of high-pressure roller mill is set, high pressure roller is pulverized open circuit completely, and roll gap pressure is 4.2MPa, and roller speed is 30r/min, and roll gap is 2mm.After high-pressure roller mill idle running is normal, set the rotating speed 0.5m/s of feeding belt, the rotating speed 400r/min of V-type rotor of powder separator, the rotating speed 2000r/min of dust-precipitator, then open successively conveying worm, material is fed to high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjust feeding belt rotating speed to feeding coal and equate with load;
(3) the whole ground prod of high pressure roller is added to water stirrings of sizing mixing, then feed in floatation equipment, first add diesel oil to stir 500g/t 3min, then add terpenic oil 100g/t stirring 1min, roughly select 3min, obtain thick cleaned coal; Then add diesel oil 200g/t to stir 3min, then add terpenic oil 40g/t to stir 1min, carry out once purging selection 3min; Thick cleaned coal is carried out to primary blank selected, obtain cleaned coal; Scanning cleaned coal and selected tail coal mixes to turn back to and roughly selects.
The productive rate of cleaned coal is 55.44%, and ash content is 9.53%; The productive rate of tail coal is 44.56%, and ash content is 46.56%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal can improve 1.32%, and ash content reduces by 0.48%.
embodiment 5
Middle coal is coal in the washing of thermal coal coal washery, and granularity is less than 200mm, and ash content is 24.86%.After adopting high pressure roller final grinding system centering coal dust mill, carry out flotation, processing step is as follows:
(1) in, coal adopts gyratory crusher to carry out fragmentation, and the sieve that the product application sieve aperture after fragmentation is 50mm sieves, and on-the-sieve material turns back to gyratory crusher and carries out fragmentation, and undersize material enters feed bin;
(2) running parameter of high-pressure roller mill is set, high pressure roller is pulverized the circulation of band rim charge, and roll gap pressure is 5.5MPa, and roller speed is 10r/min, and roll gap is 5mm.After high-pressure roller mill idle running is normal, set the rotating speed 1.0m/s of feeding belt, the rotating speed 500r/min of V-type rotor of powder separator, the rotating speed 3000r/min of dust-precipitator, then open successively conveying worm, material is fed to high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjust feeding belt rotating speed to feeding coal and equate with load;
(3) the whole ground prod of high pressure roller is added to water stirrings of sizing mixing, then feed in floatation equipment, first add kerosene 1000g/t to stir 3min, then add terpenic oil 100g/t stirring 1min, roughly select 3min, obtain thick cleaned coal; Then add kerosene 500g/t to stir 3min, then add terpenic oil 50g/t to stir 1min, carry out once purging selection 3min; Thick cleaned coal is carried out to primary blank selected, obtain cleaned coal; Scanning cleaned coal and selected tail coal mixes to turn back to and roughly selects.
The productive rate of cleaned coal is 58.94%, and ash content is 8.89%; The productive rate of tail coal is 41.06%, and ash content is 47.78%.Compare with sorting process with middle coal tradition is broken, the productive rate of cleaned coal can improve 2.44%, and ash content reduces by 0.38%.
Claims (6)
1. the whole grinding of the high pressure roller of coal and a method for separating in, is characterized in that carrying out according to following steps:
(1) middle coal is crushed to below the mill feed size that is suitable for high pressure roller final grinding system;
(2) running parameter of high-pressure roller mill is set: high pressure roller mill technique is opened a way completely or is with rim charge circulation, and roll gap pressure is 3 ~ 6MPa, and roller speed is 10 ~ 30r/min, and roll gap is 2 ~ 5mm; After high-pressure roller mill idle running is normal, the rotating speed of setting feeding belt is 0.25 ~ 1m/s, the rotating speed of V-type rotor of powder separator is 50 ~ 500r/min, the rotating speed of dust-precipitator is 1000 ~ 3000r/min, then open successively conveying worm, material is fed to high-pressure roller mill hopper, open roll squeezer flap valve, carry out the whole grinding test of high pressure roller, after stable equipment operation, adjust feeding belt rotating speed to feeding coal and equate with load;
(3) the whole ground prod of high pressure roller is added to the water stirring of sizing mixing, then feed in floatation equipment, first add collecting agent to stir 3min, the addition of collecting agent is 400 ~ 1000g/t, then add foaming agent to stir 1min, the addition of foaming agent is 40 ~ 100g/t, roughly selects 3 ~ 4min, obtains thick cleaned coal; Then add collecting agent to stir 3min, the addition of collecting agent is that 200 ~ 500g/t adds foaming agent to stir 1min again, and the addition of foaming agent is 20 ~ 50g/t, carries out once purging selection 3min; Thick cleaned coal is carried out to primary cleaning 2min, obtain cleaned coal; Scanning cleaned coal and selected tail coal mixes to turn back to and roughly selects.
2. the whole grinding of the high pressure roller of a kind of middle coal according to claim 1 and method for separating, is characterized in that in described step (1), and raw coal disintegrating apparatus is selected jaw crusher, gyratory crusher or high-pressure roller mill.
3. the whole grinding of the high pressure roller of a kind of middle coal according to claim 1 and method for separating, is characterized in that, in described step (1), the mill feed size of high pressure roller final grinding system is 10 ~ 50mm.
4. the whole grinding of the high pressure roller of a kind of middle coal according to claim 1 and method for separating, is characterized in that, in described step (3), floatation equipment is flotation device or flotation column.
5. the whole grinding of the high pressure roller of a kind of middle coal according to claim 1 and method for separating, is characterized in that in described step (3), and collecting agent is that kerosene is or/and diesel oil.
6. the whole grinding of the high pressure roller of a kind of middle coal according to claim 1 and method for separating, is characterized in that in described step (3), and foaming agent is terpenic oil, secondary octanol or methyl isobutyl carbinol.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103962230A (en) * | 2014-04-28 | 2014-08-06 | 辽宁科技大学 | Method for smashing coal gangue through rollers at high pressure and recovering coal |
| CN105032581A (en) * | 2015-07-09 | 2015-11-11 | 金堆城钼业股份有限公司 | Smashing and classifying technology for molybdenite |
| WO2017161922A1 (en) * | 2016-03-22 | 2017-09-28 | 中国矿业大学 | Process for liberating and separating slack middling obtained from coking |
| CN108262139A (en) * | 2018-03-22 | 2018-07-10 | 山西能源学院 | A kind of breaking method for coal mining |
| CN111136086A (en) * | 2019-12-27 | 2020-05-12 | 西南科技大学 | Method and device for reducing coking coal ash content through steam jet controlled dissociation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102861663B (en) * | 2012-10-08 | 2013-10-30 | 中国矿业大学 | Breaking grinding dissociation and re-flotation two-stage recovery process of coal in scarce coking |
| CN103143432B (en) * | 2013-02-28 | 2014-07-16 | 中国矿业大学 | Efficient crushing and three-section type screening method of coking coal gravity middings |
| CN103386355B (en) * | 2013-07-23 | 2015-10-14 | 侯英 | A kind of high pressure roller selective molecular attraction of middle coal and method for separating |
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2013
- 2013-11-20 CN CN201310585842.3A patent/CN103623932B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103962230A (en) * | 2014-04-28 | 2014-08-06 | 辽宁科技大学 | Method for smashing coal gangue through rollers at high pressure and recovering coal |
| CN105032581A (en) * | 2015-07-09 | 2015-11-11 | 金堆城钼业股份有限公司 | Smashing and classifying technology for molybdenite |
| WO2017161922A1 (en) * | 2016-03-22 | 2017-09-28 | 中国矿业大学 | Process for liberating and separating slack middling obtained from coking |
| CN108262139A (en) * | 2018-03-22 | 2018-07-10 | 山西能源学院 | A kind of breaking method for coal mining |
| CN111136086A (en) * | 2019-12-27 | 2020-05-12 | 西南科技大学 | Method and device for reducing coking coal ash content through steam jet controlled dissociation |
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