AU2018321191B2 - System for detecting and sampling heavy metal ions in goaf of coal mine filled with gangue - Google Patents
System for detecting and sampling heavy metal ions in goaf of coal mine filled with gangue Download PDFInfo
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- AU2018321191B2 AU2018321191B2 AU2018321191A AU2018321191A AU2018321191B2 AU 2018321191 B2 AU2018321191 B2 AU 2018321191B2 AU 2018321191 A AU2018321191 A AU 2018321191A AU 2018321191 A AU2018321191 A AU 2018321191A AU 2018321191 B2 AU2018321191 B2 AU 2018321191B2
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- 238000005070 sampling Methods 0.000 title claims abstract description 48
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 28
- 239000003245 coal Substances 0.000 title claims abstract description 27
- 150000002500 ions Chemical class 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 238000005065 mining Methods 0.000 claims abstract description 15
- 239000004677 Nylon Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 229920001778 nylon Polymers 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000037361 pathway Effects 0.000 abstract 2
- 101100393235 Caenorhabditis elegans gon-1 gene Proteins 0.000 abstract 1
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract 1
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000011109 contamination Methods 0.000 abstract 1
- 239000000284 extract Substances 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 238000002791 soaking Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 239000008187 granular material Substances 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1813—Specific cations in water, e.g. heavy metals
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Biochemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
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(43) d VTWO 2019/037795 A1
2019 4 2 ) 28 (28.02.2019) W IPO I PCT
(51) MpN-41) : Jiangsu221116 (CN)o #|(HAN,Zhen); +PM
GON 1/14 (2006.01) G01N33/18 (2006.01) IT 3 5 )141 r b fi7 1 , Jiangsu 221116
(21) p PCT/CN2018/102659 (CN) o 1(Ad(ZHANG,Jixiong); + 4l35 (
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201810109458.9 2018 4 2A]5H (05.02.2018) CN (CN)o TL M (KONG, Guoqiang); l I3n
(71) $i : * r ( * N(CHINA UNIVERSITY f )+HHtl N E 1I, Jiangsu 221116 (CN)o
OF MINING AND TECHNOLOGY) [CN/CN]; ITi AB* (WANG, Fengwan); +Fl43 ilflT'I[T$4H
l I3 5 ( + 'I'[ T4 H Wi X f E #t 1 t, i # i1, Jiangsu221116 (CN)o
Jiangsu 221116 (CN)o (74) tI ,: 1$]- - A $ f -PTf (JIANGSU SUNDY
(72) &fR WAiJ(HUANG, Yanli); +4l& HLAW FIRM); + l3 T IT J M§ N
TiT 4H W E M 1 , Jiangsu 221116 (CN)o J, j, J 20 58 A 10 # f Ili
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1 -, Jiangsu 221116 (CN) o gt I(DONG, (81) 1$Pf ((9 ], V $ V @- f f fT J f [
Jihong); +' Li E M 1 i, f)gp): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG,
(54) Title: COAL GANGUE FILLING COAL MINE GOAF HEAVY METAL ION DETECTION AND SAMPLING SYSTEM
AA
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DID
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AA COAL CC MINING PATHWAY
BB GOAF DD COAL MINING FACE ADVANCEMENT DIRECTION
(57) Abstract: A coal gangue filling coal mine goaf heavy metal ion detection and sampling system, composed of several collection
apparatuses (1), and sampling tubes (3) equal in number to the collection apparatuses. The collection apparatuses (1) are arranged in
rows at set intervals, and equally divided into several longitudinal channels (7) by water separation plates (4), wherein one longitudinal
channel (7) is provided with a water-permeable opening (6). The collection apparatuses (1) in each row are sequentially connected by
connection tubes (2), various communication channels are formed within tube bodies, and the water-permeable openings (6) of the
collection apparatuses (1) are respectively located on different communication channels. The various sampling tubes (3) are respectively
t- connected to the collection apparatuses (1) and the connection tubes at end portions of the communication channels to form transport
t pipelines, and the sampling tubes (3) are arranged within a mining area connecting pathway and connected to a water pump outside
a goaf. The system respectively extracts accumulated mine water from designated positions in the goaf for storage, determines heavy
metal ion concentrations in goaf coal gangue filling body soaking solutions, gives a true reflection of distribution states of heavy metal
ions within the goaf, and provides a sampling means for further analysing goaf heavy metal contamination.
W O 2019/037795 A 1 ||||||||1|||||||||||||||I|I|||11|1||I|I|I|I|||||||||||V|I |||||||||||||||||
BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU,
CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, Fl, GB,
GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS,
JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK,
LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX,
MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL,
PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL,
SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG,
US, UZ, VC, VN, ZA, ZM, ZWc
(84) p AT-(p^4 ,R- f*tM lz
M': ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ,
NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), RIl (AM,
AZ, BY, KG, KZ, RU, TJ, TM), [II (AL, AT, BE, BG,
CH, CY, CZ, DE, DK, EE, ES, Fl, FR, GB, GR, HR, HU,
IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT,
RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI,
CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG).
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Description
Technical Field
The present disclosure relates to a system for detecting and sampling heavy metal ions in a coal mine goaf filled with gangue.
Related Art
In recent years, the exhaustion of mine resources is accelerated along with the increase of coal mining speed. Because the issue of "three-below" (below buildings, below railways, below water) unexploited coal in China is serious, a comprehensive mechanical solidfilling coal mining technology, one of green coal mining technologies, is developed, aiming at the "three-below" unexploited coal issue, the gangue discharge issue, and the land resource issue, and is widely applied in multiple mine.
After a goaf is filled with gangue, a compact structure is formed under the action of a punning mechanism behind a filling coal mining hydraulic support. Because the subsurface environment is relatively dark and damp, part of gangue fed into the goaf is in a mine water environment all the time, which mainly includes water leaking from cracks of a top plate of an overlying rock, water rushing out from a bottom plate, and water rushing out by coal mining. After the goaf is steady, the gangue is immersed in the damp environment of mine water for a long time. Small granules in the gangue become suspended matters in water, and some heavy metal ions contained in the small granules pollute the water body, the surrounding rock, and other ecological environments after being dissolved by water, and thus cause certain damage to the groundwater environment. Therefore, real-time and accurate detection of heavy metal ions needs to be performed on the water body in the mine goaf filled with gangue. However, the goaf is an airtight space, and water body sampling in the goaf after backfilling is very difficult. Especially, for sampling respectively at different sites in the goaf, no effective method is available currently.
The development of a sampling system and method for heavy metal ions in a goaf filled with gangue has great importance to the detection and treatment of heavy metal ions in the ponding in the goaf filled with gangue, and is the real technical requirement of the coal mining operation.
The technical problem to be solved by the present disclosure is to make up the blank of the prior art, and a system for detecting and sampling heavy metal ions in a coal mine goaf filled with gangue is provided, aiming at the characteristic of great difficulty in sampling because the goaf is an airtight space. The system in the present disclosure is gradually arranged behind a support along with the advancing of a mining working face, and sampling sites are uniformly distributed in the goaf, so as to implement real-time uniform sampling, wherein the collecting device is a cylindrical tube, a plurality of water stop sheets are arranged in the cylindrical tube, and the water stop sheets equally divide the interior of the cylindrical tube into a plurality of lengthways channels with sector sections by the lengthways central axis of the cylindrical tube; a water permeating hole is formed on one of the lengthways channels, a water permeating net is arranged on the water permeating hole; the cylindrical tube is fixed to a clamping seat, and a water pressure monitor is arranged in the lengthways channel and located at the bottom; and the quantity of the collecting devices in each row is smaller than or equal to the quantity of the lengthways channels divided from the collecting devices, the collecting devices in each row are sequentially connected by connecting tubes; the connecting tube is a cylindrical tube and is divided into a plurality of lengthways channels with sector sections by water stop sheets, and the quantity of the channels is the same as that of the collecting devices; the lengthways channels of the collecting devices are correspondingly connected to the lengthways channels of the connecting tubes to form communicating channels, the water permeating holes of the collecting devices are respectively located on different communicating channels; and the sampling tubes are respectively connected to end parts of the communicating channels.
The system for detecting and sampling heavy metal ions in a coal mine goaf filled with gangue in the present disclosure is formed by a plurality of collecting devices and sampling tubes with the quantity being equal to that of the collecting devices.
The collecting devices are arranged in rows parallel to a working face in the goaf according to a set spacing, the collecting devices in each row are arranged according to a set spacing. Each collecting device is a sampling site and connected to one of the sampling tubes. The sampling tubes are distributed in a mining roadway of the mining area and connected to a water pump outside the goaf.
The set spacing is preferably 30 m to 50 m.
The collecting device is a cylindrical tube, a plurality of water stop sheets is arranged in the cylindrical tube, and the water stop sheets equally divide the interior of the cylindrical tube into a plurality of lengthways channels with fan-shaped sections along the lengthways central axis of the cylindrical tube; a water permeating hole is formed on one of the lengthways channels, a water permeating net is arranged on the water permeating hole; the cylindrical tube is fixed to a clamping seat, and a water pressure monitor is arranged in the lengthways channel and located at the bottom.
The quantity of the collecting devices in each row is smaller than or equal to the quantity of the lengthways channels divided from the collecting devices, the collecting devices in each row are sequentially connected by connecting tubes; the connecting tube is also a cylindrical tube and is divided into a plurality of lengthways channels with fan-shaped sections by water stop sheets, and the quantity of the channels is the same as that of the collecting devices. The lengthways channels of the collecting devices are correspondingly connected to the lengthways channels of the connecting tubes to form communicating channels, the water permeating holes of the collecting devices are respectively located on different communicating channels; and the sampling tubes are respectively connected to end parts of the communicating channels.
The collecting device and the connecting tube are preferably steel tubes or strong nylon tubes.
The layout and sampling processes of the system for detecting and sampling heavy metal ions in a coal mine goaf filled with gangue are as follows:
1. Along with the advancing of the working face, the collecting devices are set parallel to the working face and behind the support according to a set interval of 30 m to 50 m, the collecting devices are connected by the connecting tubes to form a communicated tube body, and each collecting device is a measuring site. Then a row of collecting devices are arranged after the working face is advanced to a certain distance, and the interval of each row is the same as the spacing between adjacent collecting devices in the same row. The measuring sites are arranged according to a manner of a square (spacing between the measuring sites are equal). Because only one water permeating hole of one collecting device is located in one communicating channel, only a water sample at the position of the collecting device flows into the communicating channel, and the water sample collected from the communicating channel is the water sample at the measuring site where this collecting device is located.
2. After advancing of the working face is finished, the water pressure P at the bottom plate of the goaf is monitored by using the water pressure monitor, the ponding height h in the goaf is reversely derived according to the formula P=pgh. When the height is greater than 30 cm, the water sample is pumped from each communicating channel via each sampling tube.
3. The collecting device of each measuring site is labeled (for example, the first one in the first row is "11", the first one in the second row is "21"), and the position of the goaf corresponding to the extracted sample is reversely derived according to the sampling inter-row spacing. The content, migration characteristic, and attenuation attribute of each heavy metal ion are analyzed according to different concentrations in different positions, so as to evaluate the heavy metal ions in the goaf.
According to the present disclosure, the ponding in the mine can be taken out from the airtight space of the goaf, the concentration of the heavy metal ions of each position in the goaf can be ascertained, the distribution state of the heavy metal ions in the goaf is truly reflected, and a sampling means is provided for further analysis of the heavy metal pollution in the goaf.
FIG. 1 is a layout chart of a system for detecting and sampling heavy metal ions in a coal mine goaf filled with gangue according to the present disclosure;
FIG. 2 is a schematic three-dimensional view of a collecting device according to the present disclosure;
FIG. 3 is a schematic top view of the collecting device according to the present disclosure; and
FIG. 4 is a schematic side view of the collecting device according to the present disclosure.
The present disclosure is further described in detail below with reference to the accompanying drawings.
As shown in FIG. 1, a system for detecting and sampling heavy metal ions in a coal mine goaf filled with gangue in the present disclosure is formed by a plurality of collecting devices 1, connecting tubes 2, and sampling tubes 3 with the quantity being equal to that of the collecting devices.
The collecting devices 1 are arranged in rows parallel to a working face in the goaf according to a set spacing of 40 m, the collecting devices 1 in each row are arranged according to a set spacing of 40 m, and each collecting device is a sampling site.
The collecting device 1 is a cylindrical tube, which is a steel tube or a strong nylon tube with the length of 10 m and the diameter of 0.15 m. A plurality of water stop sheets 4 is arranged in the cylindrical tube, and the water stop sheets equally divide the interior of the cylindrical tube into six lengthways channels 7 with sector sections by the lengthways central axis of the cylindrical tube. A water permeating hole 6 is formed on one of the lengthways channels, and a water permeating net is arranged on the water permeating hole. The cylindrical tube is fixed to a clamping seat 5, and a water pressure monitor 8 is arranged in the lengthways channel at the bottom.
Because the quantity of the lengthways channels of the collecting devices is six, the quantity of the collecting devices in each row is six at most. In this embodiment, four collecting devices are arranged in each row, and the collecting devices in each row are sequentially connected by the connecting tubes 2. The connecting tube 2 is also a cylindrical tubes, which is a steel tube or a strong nylon tube with the length of 10 m and the diameter of 0.15 m, and is equally divided into six lengthways channels with sector sections by the water stop sheets, and no water permeating hole is formed on the connecting tube 2. The lengthways channels of the collecting devices are correspondingly connected to the lengthways channels 7 of the connecting tubes to form the communicating channels, and only one water permeating hole 6 of one collecting device exists on this communicating channel. Therefore, four communicating channels have the water permeating holes 6. One sampling tube 3 is led out from an end part of each of the four communicating channels, and in this embodiment, four sampling tubes 3 are arranged at an end part of each row. The sampling tubes 3 are arranged in a mining roadway, and are connected to a water pump outside the goaf.
The layout and sampling processes of the system for detecting and sampling heavy metal ions in a goaf of a coal mine filled with gangue are as follows:
1. Along with the advancing of the working face, the collecting devices are embedded parallel to the working face and behind a support according to a set interval of 30 m to 50 m, the collecting devices are connected by the connecting tubes to form an interconnected tube body, and each collecting device is a measuring site. Then a row of collecting devices are arranged after the working face is advanced to a certain distance, and the interval of each row is the same as the spacing between adjacent collecting devices in the same row. The measuring sites are arranged according to a manner of a square (spacings between the measuring sites are equal). Because there is only one water permeating hole of one collecting device located in one communicating channel, only a water sample at the position of the collecting device flows into this communicating channel, and the water sample collected from this communicating channel is the water sample at the measuring site where this collecting device is located.
2. After advancing of the working face is finished, the water pressure P at the bottom plate of the goaf is monitored by using the water pressure monitor, the ponding height h in the goaf is reversely derived according to the formula P=pgh, and when the height is greater than 30 cm, the water sample from each communicating channel is pumped via each sampling tube.
3. The collecting device of each measuring site is labeled (for example, the first one in the first row is "11", the first one in the second row is "21"), and the position of the goaf corresponding to the extracted sample is reversely derived according to the sampling inter-row spacing. The content, migration characteristic, and attenuation attribute of each heavy metal ion are analyzed according to different concentrations in different positions, so as to evaluate the situation of the heavy metal ions in the goaf.
Throughout the specification and the claims that follow, unless the context requires otherwise, the words "comprise" and "include" and variations such as "comprising" and "including" will be understood to imply the inclusion of a stated integer or group of integers, but not the exclusion of any other integer or group of integers.
The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement of any form of suggestion that such prior art forms part of the common general knowledge.
It will be appreciated by those skilled in the art that the disclosure is not restricted in its use to the particular application described. Neither is the present disclosure restricted in its preferred embodiment with regard to the particular elements and/or features described or depicted herein. It will be appreciated that the disclosure is not limited to the embodiment or embodiments disclosed, but is capable of numerous rearrangements, modifications and substitutions without departing from the scope of the disclosure as set forth and defined by the following claims.
Claims (3)
1. A system for sampling heavy metal ions in a coal mine goaf filled with gangue, comprising a plurality of collecting devices and sampling tubes comprising a quantity being equal to that of the collecting devices, wherein
the collecting devices are arranged in rows in the goaf along an advancing direction of a working face, the collecting devices in each row are arranged according to a spacing of two adjacent rows, the collecting devices are arranged behind a hydraulic support along with the advancing of the working face, each collecting device is a sampling site, each collecting device is connected to one of the sampling tubes, and the sampling tubes are arranged in a mining roadway and connected to a water pump outside the goaf, wherein
the collecting device is a cylindrical tube, a plurality of water stop sheets are arranged in the cylindrical tube, and the water stop sheets equally divide the interior of the cylindrical tube into a plurality of lengthways channels with sector sections by the lengthways central axis of the cylindrical tube; a water permeating hole is formed on one of the lengthways channels, a water permeating net is arranged on the water permeating hole; the cylindrical tube is fixed to a clamping seat, and a water pressure monitor is arranged in the lengthways channel and located at the bottom; and the quantity of the collecting devices in each row is smaller than or equal to the quantity of the lengthways channels divided from the collecting devices, the collecting devices in each row are sequentially connected by connecting tubes; the connecting tube is a cylindrical tube and is divided into a plurality of lengthways channels with sector sections by water stop sheets, and the quantity of the channels is the same as that of the collecting devices; the lengthways channels of the collecting devices are correspondingly connected to the lengthways channels of the connecting tubes to form communicating channels, the water permeating holes of the collecting devices are respectively located on different communicating channels; and the sampling tubes are respectively connected to end parts of the communicating channels.
2. The system for sampling heavy metal ions in a goaf of a coal mine filled with gangue according to claim 1, wherein the spacing of the two adjacent rows of the collecting devices is 30 m to 50 m.
3. The system and sampling heavy metal ions in a coal mine goaf filled with gangue according to any one of claims 1 or 2, wherein the collecting device, the sampling tube, and the connecting tube are all steel tubes or strong nylon tubes.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810109458.9A CN108051255B (en) | 2018-02-05 | 2018-02-05 | Coal gangue filling coal mine goaf heavy metal ion detection sampling system |
| CN201810109458.9 | 2018-02-05 | ||
| PCT/CN2018/102659 WO2019037795A1 (en) | 2018-02-05 | 2018-08-28 | Coal gangue filling coal mine goaf heavy metal ion detection and sampling system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2018321191A1 AU2018321191A1 (en) | 2019-08-22 |
| AU2018321191B2 true AU2018321191B2 (en) | 2020-08-27 |
Family
ID=62125826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2018321191A Ceased AU2018321191B2 (en) | 2018-02-05 | 2018-08-28 | System for detecting and sampling heavy metal ions in goaf of coal mine filled with gangue |
Country Status (5)
| Country | Link |
|---|---|
| CN (1) | CN108051255B (en) |
| AU (1) | AU2018321191B2 (en) |
| RU (1) | RU2715659C1 (en) |
| WO (1) | WO2019037795A1 (en) |
| ZA (1) | ZA202005350B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108051255B (en) * | 2018-02-05 | 2020-08-07 | 中国矿业大学 | Coal gangue filling coal mine goaf heavy metal ion detection sampling system |
| CN109490499B (en) * | 2018-11-15 | 2021-02-05 | 长沙矿山研究院有限责任公司 | Dynamic monitoring and predicting method for water quality of filling body |
| CN112990350B (en) * | 2021-04-12 | 2022-12-13 | 天津美腾科技股份有限公司 | Target detection network training method and target detection network-based coal and gangue identification method |
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2018
- 2018-02-05 CN CN201810109458.9A patent/CN108051255B/en active Active
- 2018-08-28 AU AU2018321191A patent/AU2018321191B2/en not_active Ceased
- 2018-08-28 WO PCT/CN2018/102659 patent/WO2019037795A1/en active Application Filing
- 2018-08-28 RU RU2019106067A patent/RU2715659C1/en active
-
2020
- 2020-08-27 ZA ZA2020/05350A patent/ZA202005350B/en unknown
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| CN203259373U (en) * | 2012-09-24 | 2013-10-30 | 张丽颖 | Underground water stratified sampling pipe |
| CN104453982A (en) * | 2014-10-30 | 2015-03-25 | 安徽理工大学 | Simple and convenient goaf bundle pipe gas extraction device and method |
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| CN106066262A (en) * | 2016-06-03 | 2016-11-02 | 山西大学 | Gangue percolate harvester |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019037795A1 (en) | 2019-02-28 |
| CN108051255A (en) | 2018-05-18 |
| CN108051255B (en) | 2020-08-07 |
| RU2715659C1 (en) | 2020-03-02 |
| AU2018321191A1 (en) | 2019-08-22 |
| ZA202005350B (en) | 2022-09-28 |
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