CN115041295A - Coal slime flotation and recleaning process - Google Patents
Coal slime flotation and recleaning process Download PDFInfo
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- CN115041295A CN115041295A CN202210680871.7A CN202210680871A CN115041295A CN 115041295 A CN115041295 A CN 115041295A CN 202210680871 A CN202210680871 A CN 202210680871A CN 115041295 A CN115041295 A CN 115041295A
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- 238000005188 flotation Methods 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000003825 pressing Methods 0.000 claims abstract description 26
- 239000003250 coal slurry Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 10
- 239000002562 thickening agent Substances 0.000 claims description 8
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- 238000004064 recycling Methods 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims 7
- 239000011707 mineral Substances 0.000 claims 7
- 238000011085 pressure filtration Methods 0.000 claims 4
- 238000000926 separation method Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 238000000605 extraction Methods 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 1
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- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- 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
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Abstract
The invention discloses a coal slime flotation recleaning process, which comprises the following steps: s1: performing first-stage flotation on the coal slime to obtain first clean coal, first middlings and first tailings; s2: if the floatability of the coal slime is not less than a set threshold value, performing filter pressing on the first clean coal and the first middlings to obtain target clean coal; if the floatability of the coal slime is smaller than a set threshold value, performing two-stage flotation on the first middlings to obtain second clean coals and second middlings; s3: performing filter pressing on the first clean coal and the second clean coal to obtain target clean coal; sequentially concentrating and filter-pressing the second middlings to obtain target middlings; and sequentially concentrating and filter-pressing the first tail coal to obtain the target tail coal. The coal slime flotation and re-separation process provided by the embodiment of the invention can realize a better separation effect on the coal slime with different floatability, so that the phenomena of serious coal leakage and back ash are avoided, the adaptability of the flotation process to coal quality fluctuation is improved, and the extraction rate of clean coal can be greatly improved.
Description
Technical Field
The invention relates to the technical field of coal preparation plants, in particular to a coal slime flotation and recleaning process.
Background
In order to select clean coal from a large amount of coal slime, improve clean coal yield and increase economic benefits, a flotation method is widely adopted in a coal preparation plant to separate the coal slime, and in the related technology, the coal slime flotation link is poor in separation effect, serious in coal leakage, low in recovery rate of flotation clean coal, causes gravity concentration back ash phenomenon and greatly loses enterprise economic benefits due to the fact that the floatability of the coal slime is poor.
Disclosure of Invention
Therefore, the embodiment of the invention provides a coal slime flotation and recleaning process which can improve the extraction rate of clean coal and realize a better flotation effect.
The coal slime flotation recleaning process provided by the embodiment of the invention comprises the following steps:
s1: and performing first-stage flotation on the coal slime to obtain first clean coal, first middlings and first tailings.
S2: if the floatability of the coal slime is not less than a set threshold value, performing filter pressing on the first clean coal and the first middlings to obtain target clean coal; and if the floatability of the coal slime is smaller than a set threshold value, performing two-stage flotation on the first middlings to obtain second clean coals and second middlings.
S3: performing filter pressing on the first clean coal and the second clean coal to obtain target clean coal; sequentially concentrating and filter-pressing the second middlings to obtain target middlings; and sequentially concentrating and filter-pressing the first tail coal to obtain target tail coal.
The coal slime flotation and re-separation process provided by the embodiment of the invention can realize a better separation effect on the coal slime with different floatability, so that the phenomena of serious coal leakage and back ash are avoided, the adaptability of the flotation process to coal quality fluctuation is improved, and the extraction rate of clean coal can be greatly improved.
In some embodiments, the secondary flotation in step S2 includes the steps of: and performing secondary flotation on the first middling coal by using overflow of the middling rock cyclone.
In some embodiments, the coal slurry flotation recleaning process further comprises the steps of:
s4: recovering coal slime water which is generated along with the target clean coal, the target middling coal and the target tail coal;
s5: and mixing the coal slurry water into the first tail coal before concentration.
In some embodiments, the coal slurry flotation recleaning process further comprises the steps of:
s6: and recycling and reusing circulating water generated in the concentration of the first tail coal.
In some embodiments, in step S1, the coal slurry is subjected to a first stage flotation by using a main flotation machine, the main flotation machine includes a first collection bin, a second collection bin and a plurality of ore tanks, the ore tanks are sequentially arranged along a direction from the upstream to the downstream of the flotation, the first collection bin is communicated with part of the ore tanks to collect first clean coal, and the second collection bin is communicated with the rest part of the ore tanks to collect first middlings.
In some embodiments, the primary flotation machine is a five-cell flotation machine having five of the ore tanks therein, the five ore tanks being, in order in the direction from upstream to downstream of flotation, a first ore tank, a second ore tank, a third ore tank, a fourth ore tank, and a fifth ore tank.
In some embodiments, the first and second troughs are each in communication with the first collection bin, and the third, fourth and fifth troughs are each in communication with the second collection bin.
In some embodiments, the first, second and third mine chutes are all in communication with the first collection bin, and the fourth and fifth mine chutes are all in communication with the second collection bin.
In some embodiments, in step S2, the first cleaned coal and the first middlings are filter-pressed by a first filter press, the first middlings are subjected to secondary flotation by a secondary flotation machine, and in step S3, the first cleaned coal and the second cleaned coal are filter-pressed by the first filter press, the concentrated second middlings are filter-pressed by a second filter press, and the concentrated first tailings are filter-pressed by a third filter press.
The first collecting bin is provided with a first pipeline, the second collecting bin is provided with a second pipeline and a third pipeline, the first pipeline and the second pipeline are communicated to the first filter press, the third pipeline is communicated to the secondary flotation machine, and valves are arranged on the first pipeline, the second pipeline and the third pipeline.
In some embodiments, in step S3, the second middlings are concentrated with a first thickener and the first tailings are concentrated with a second thickener.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the invention.
Figure 2 is a schematic diagram of the primary flotation machine of an embodiment of the present invention.
Reference numerals:
a primary flotation machine 1; a first collection bin 11; a first pipe 111; a second collecting bin 12; a second conduit 121; a third conduit 122;
a secondary flotation machine 2; a first filter press 3; a second filter press 4; a third filter press 5; a first thickener 6; a second thickener 7.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1-2, the coal slime flotation recleaning process of the embodiment of the invention comprises the following steps:
s1: and performing primary flotation on the coal slime to obtain first clean coal, first middlings and first tail coal. Specifically, the coal slurry may be subjected to a first-stage flotation by using the primary flotation machine 1, wherein the first clean coal may float out upstream of the primary flotation machine 1, the first middlings may float out downstream of the primary flotation machine 1, and the first tailings may be discharged at the tail end of the primary flotation machine 1.
S2: if the floatability of the coal slime is not less than a set threshold value, performing filter pressing on the first clean coal and the first middlings to obtain target clean coal; and if the floatability of the coal slime is smaller than a set threshold value, performing two-stage flotation on the first middlings to obtain second clean coals and second middlings.
Specifically, when the floatability of coal slime is better, that is, the floatability of coal slime is greater than or equal to the set threshold value, first cleaned coal and first middlings that the upper reaches and the lower reaches of main flotation machine 1 float respectively can all reach the demand standard of cleaned coal, can send into first cleaned coal and first middlings to carry out the filter-pressing in first pressure filter 3 simultaneously this moment, can be in order to obtain required target cleaned coal.
When the floatability of coal slime is poor, namely the floatability of coal slime is less than a set threshold value, the first clean coal floated and selected at the upstream of the main flotation machine 1 can reach the requirement standard of clean coal, the first middlings with relatively poor quality can be floated and selected at the downstream of the main flotation machine 1, the first middlings can be sent into the secondary flotation machine 2 for secondary two-stage flotation, the second clean coal can be the part with good quality and selected by the secondary flotation machine 2, and the second middlings can be the part with poor quality discharged from the tail end of the secondary flotation machine 2.
S3: performing filter pressing on the first clean coal and the second clean coal to obtain target clean coal; sequentially concentrating and filter-pressing the second middlings to obtain target middlings; and sequentially concentrating and filter-pressing the first tail coal to obtain the target tail coal.
Specifically, when the floatability of the coal slurry is poor, the first middlings flotated at the downstream of the main flotation machine 1 need to be subjected to secondary flotation to obtain second clean coals and second middlings, and the first clean coals obtained in the primary flotation and the second clean coals obtained in the secondary flotation can be simultaneously sent into a first filter press 3 to be subjected to filter pressing, so that the required target clean coals with good quality can be obtained; and the second middlings obtained in the two-stage flotation are sent into a first thickener 6 for concentration, and then sent into a second filter press 4 for filter pressing, so that target middlings with the quality lower than that of target clean coal and higher ash content can be obtained, the first tail coals obtained in the one-stage flotation are sent into a second thickener 7 for concentration, and then sent into a third filter press 5 for filter pressing, so that the target tail coals with the ash content meeting the abandonment requirement can be obtained.
According to the coal slime flotation recleaning process, when the floatability of the coal slime is poor, the first-stage flotation and the second-stage flotation are respectively carried out on the coal slime, the flotation is more thorough, a good separation effect can be achieved, the phenomena of serious coal leakage and back ash are avoided, the adaptability of the flotation process to coal quality fluctuation is improved, and meanwhile the extraction rate of clean coal can be greatly improved.
In some embodiments, the secondary flotation in step S2 includes the steps of: and performing secondary flotation on the first middling coal by using the overflow of the middling rock cyclone. Specifically, the feeding material of the medium gangue cyclone can be tailings of a medium gangue magnetic separator in a coal preparation plant, and the overflow of the medium gangue cyclone can be used as dilution water to be sent to the secondary flotation machine 2 together with the first medium coal obtained in the first-stage flotation for secondary flotation, so that the problem of water supplement to the system in the conventional flotation link is solved, the process flow is simplified, and the washing water load is prevented from increasing.
In some embodiments, the coal slurry flotation recleaning process further comprises the steps of:
s4: recovering slime water generated along with target clean coal, target middling coal and target tail coal;
s5: mixing the coal slurry water into the first tail coal before concentration.
S6: and recycling and reusing circulating water generated in the concentration of the first tail coal.
Specifically, as shown in fig. 1, slime water is generated during the processes of filter pressing by the first filter press 3, filter pressing by the second filter press 4, filter pressing by the third filter press 5 and concentration by the first concentrator 6, and the slime water and first tailings generated during one-stage flotation can be sent to the second concentrator 7 for concentration, so that coal in the slime water can be recycled again.
In some embodiments, in step S1, the primary flotation machine 1 includes a first collecting bin 11, a second collecting bin 12 and a plurality of ore tanks, the plurality of ore tanks are arranged in sequence from upstream to downstream of the flotation, the first collecting bin 11 is communicated with a part of the ore tanks to collect the first clean coal, and the second collecting bin 12 is communicated with the rest of the ore tanks to collect the first middling coal.
Specifically, as shown in fig. 2, the first collecting bin 11 and the second collecting bin 12 may be respectively located at a lower portion of the primary flotation machine 1, the left-right direction of the primary flotation machine 1 may be upstream and downstream of the flotation, and the first collecting bin 11 may communicate with a portion of the ore tank located upstream of the primary flotation machine 1, the second collecting bin 12 may communicate with a remaining portion of the ore tank located downstream of the primary flotation machine 1, and the first collecting bin 11 may communicate with the first filter press 3, and the second collecting bin 12 may communicate with the secondary flotation machine 2.
In some embodiments, the primary flotation machine 1 is a five-cell flotation machine having five ore tanks, and the five ore tanks are a first ore tank, a second ore tank, a third ore tank, a fourth ore tank and a fifth ore tank in sequence from the upstream to the downstream of the flotation, and the first ore tank and the second ore tank are both communicated with the first collecting bin 11, and the third ore tank, the fourth ore tank and the fifth ore tank are all communicated with the second collecting bin 12.
Specifically, as shown in fig. 1-2, the five mine chutes are respectively used for collecting coal floated in corresponding chute chambers, according to floatability of coal slime, first clean coal can be floated from the chute chamber corresponding to the first mine chute and the chute chamber corresponding to the second mine chute, first middlings can be floated from the chute chamber corresponding to the third mine chute, the chute chamber corresponding to the fourth mine chute and the chute chamber corresponding to the fifth mine chute, the first collecting bin 11 can be simultaneously communicated with the first mine chute and the second mine chute, the first clean coal collected by the first mine chute and the second mine chute can be introduced into the first collecting bin 11, and the first middlings collected by the third mine chute, the fourth mine chute and the fifth mine chute can be introduced into the second collecting bin 12, so that the first clean coal and the first middlings can be respectively reprocessed.
In another embodiment, the first, second and third mine chutes are all in communication with the first collection bin 11, and the fourth and fifth mine chutes are all in communication with the second collection bin 12.
Specifically, according to the floatability of the coal slime, first clean coal can be floated from the chamber corresponding to the first mine groove, the chamber corresponding to the second mine groove, and the chamber corresponding to the third mine groove, first middlings can be floated from the chamber corresponding to the fourth mine groove and the chamber corresponding to the fifth mine groove, the first collection bin 11 can be communicated with the first mine groove, the second mine groove, and the third mine groove at the same time, the first clean coal collected by the first mine groove, the second mine groove, and the third mine groove can be introduced into the first collection bin 11, the first middlings collected by the fourth mine groove and the fifth mine groove can be introduced into the second collection bin 12, and the first clean coal and the first middlings can be reprocessed conveniently and respectively.
It will be appreciated that in other embodiments, the main flotation machine 1 may be a four-tank flotation machine or a six-tank flotation machine, and in this case, the first collecting bin 11 and the second collecting bin 12 may be respectively communicated with a corresponding number of ore tanks according to the floatability of the coal slurry.
The first collecting bin 11 is provided with a first pipeline 111, the second collecting bin 12 is provided with a second pipeline 121 and a third pipeline 122, the first pipeline 111 and the second pipeline 121 are communicated to the first filter press 3, the third pipeline 122 is communicated to the secondary flotation machine 2, and the first pipeline 111, the second pipeline 121 and the third pipeline 122 are all provided with valves.
Specifically, as shown in fig. 1-2, the first pipe 111 may be fixedly connected to a lower portion of the first collecting chamber 11, and may simultaneously communicate the first collecting chamber 11 with the first filter press 3, so that the first clean coal in a first stage of flotation may be introduced into the first filter press 3 for filter pressing, the second pipe 121 and the third pipe 122 may be respectively and fixedly connected to a lower portion of the second collecting chamber 12, and the second pipe 121 may communicate the second collecting chamber 12 with the first filter press 3, and the third pipe 122 may communicate the second collecting chamber 12 with the secondary flotation machine 2.
When the floatability of the coal slime is good, the valve on the third pipeline 122 can be controlled to be closed, the valves on the first pipeline 111 and the second pipeline 121 are unblocked, at the moment, first clean coal and first middling coal collected by the first collection bin 11 and the second collection bin 12 during first-stage flotation can be introduced into the first filter press 3 for filter pressing, and at the moment, second-stage flotation on the first middling coal is not needed; when the floatability of the coal slime is poor, the valve on the second pipeline 121 can be controlled to be closed, the valves on the first pipeline 111 and the third pipeline 122 are unblocked, at the moment, the first clean coal collected by the first collection bin 11 can be introduced into the first filter press 3 for filter pressing, the first middlings collected by the second collection bin 12 are introduced into the coarse flotation machine for secondary flotation, and the adaptability of the coal slime flotation recleaning process to the floatability fluctuation of the coal slime can be made to be stronger.
The first collecting bin 11 and the second collecting bin 12 may be both of a bucket-shaped structure, which facilitates discharging the collected first clean coal and the first middling coal respectively.
The effect of an application example of a certain coal preparation plant is taken as an example below.
After the washing capacity of a certain coal preparation plant is about 5.00Mt/a, the flotation feed accounts for about 23 percent of the whole sample and is about 1.15 Mt/a. Meanwhile, the fluctuation of coal washing seeds is large, when the floatability of coal slime is good, a flotation system is smooth, and when the floatability of coal washing slime is poor, a flotation link is approximately paralyzed, and tailings run out of coal is serious.
According to the analysis and the measurement of relevant step-by-step release test data, when the floatability of the coal washing slurry is poor, the balance of products before the coal slurry flotation recleaning modification is shown in a table 1, and the balance of products after the coal slurry flotation recleaning modification is shown in a table 2:
TABLE 1 Balancing table for coal slime flotation and recleaning before reconstruction
TABLE 2 Balancing table for products after coal slime flotation and recleaning reconstruction
It can be analyzed from the data in table 1 and table 2 above that, by adding the second-stage flotation re-separation process, the target clean coal can be increased by 2.32 ten thousand tons per year, the target middling coal can be increased by 8.05 ten thousand tons per year, and the economic benefit is greatly improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A coal slime flotation and recleaning process is characterized by comprising the following steps:
s1: performing first-stage flotation on the coal slime to obtain first clean coal, first middlings and first tailings;
s2: if the floatability of the coal slime is not less than a set threshold value, performing filter pressing on the first clean coal and the first middlings to obtain target clean coal; if the floatability of the coal slime is smaller than a set threshold value, performing two-stage flotation on the first middlings to obtain second clean coals and second middlings;
s3: performing filter pressing on the first clean coal and the second clean coal to obtain target clean coal; sequentially concentrating and filter-pressing the second middlings to obtain target middlings; and sequentially concentrating and filter-pressing the first tail coal to obtain the target tail coal.
2. The coal slime flotation recleaning process of claim 1, wherein the secondary flotation in step S2 comprises the following steps: and performing secondary flotation on the first middling coal by using overflow of the middling gangue cyclone.
3. The coal slime flotation recleaning process of claim 1, further comprising the steps of:
s4: recovering coal slime water which is generated along with the target clean coal, the target middling coal and the target tail coal;
s5: and mixing the coal slime water into the first tail coal before concentration.
4. The coal slime flotation recleaning process of claim 3, further comprising the steps of:
s6: and recycling and reusing circulating water generated in the concentration of the first tail coal.
5. The coal slurry flotation recleaning process according to claim 1, wherein in step S1, the coal slurry is subjected to a first-stage flotation process by using a main flotation machine, the main flotation machine comprises a first collecting bin, a second collecting bin and a plurality of ore tanks, the ore tanks are sequentially arranged along a direction from the upstream side of the flotation to the downstream side of the flotation, the first collecting bin is communicated with part of the ore tanks to collect first clean coal, and the second collecting bin is communicated with the rest of the ore tanks to collect first middling coal.
6. The coal slurry flotation recleaning process as defined in claim 5, wherein the primary flotation machine is a five-cell flotation machine having five of the mineral troughs, and the five mineral troughs are sequentially a first mineral trough, a second mineral trough, a third mineral trough, a fourth mineral trough and a fifth mineral trough along the direction from upstream flotation to downstream flotation.
7. The coal slime flotation recleaning process of claim 6, wherein said first mine trough and said second mine trough are both in communication with said first collection bin, and said third mine trough, said fourth mine trough and said fifth mine trough are all in communication with said second collection bin.
8. The coal slime flotation recleaning process of claim 6, wherein said first mine trough, said second mine trough and said third mine trough are all in communication with said first collection bin, and said fourth mine trough and said fifth mine trough are all in communication with said second collection bin.
9. The coal slurry flotation recleaning process according to claim 5, wherein in step S2, the first clean coal and the first middling coal are subjected to pressure filtration by a first pressure filter, the first middling coal is subjected to secondary flotation by a secondary flotation machine, in step S3, the first clean coal and the second clean coal are subjected to pressure filtration by the first pressure filter, the concentrated second middling coal is subjected to pressure filtration by a second pressure filter, and the concentrated first tail coal is subjected to pressure filtration by a third pressure filter;
the first collecting bin is provided with a first pipeline, the second collecting bin is provided with a second pipeline and a third pipeline, the first pipeline and the second pipeline are communicated to the first filter press, the third pipeline is communicated to the secondary flotation machine, and valves are arranged on the first pipeline, the second pipeline and the third pipeline.
10. The coal slurry flotation recleaning process as set forth in claim 1, wherein in step S3, the second middlings are concentrated by a first thickener, and the first tailings are concentrated by a second thickener.
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| CN101024211A (en) * | 2007-03-26 | 2007-08-29 | 开滦(集团)有限责任公司煤业分公司 | Floating tail-coal graded recovering process |
| CN103182349A (en) * | 2011-12-30 | 2013-07-03 | 金易通科技(北京)股份有限公司 | Three-product coal slurry flotation machine and system |
| CN106622680A (en) * | 2016-12-28 | 2017-05-10 | 淄博王煤矿业有限公司 | Floating separation system |
| US20210094045A1 (en) * | 2019-03-08 | 2021-04-01 | China University Of Mining And Technology | Underground coal separation process adopting water medium |
| AU2021100676A4 (en) * | 2021-02-03 | 2021-05-13 | Shandong University Of Science And Technology | Efficient desliming and separating method |
| 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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