CN114474408A - High-concentration paste manufacturing system and production method thereof - Google Patents
High-concentration paste manufacturing system and production method thereof Download PDFInfo
- Publication number
- CN114474408A CN114474408A CN202210225771.5A CN202210225771A CN114474408A CN 114474408 A CN114474408 A CN 114474408A CN 202210225771 A CN202210225771 A CN 202210225771A CN 114474408 A CN114474408 A CN 114474408A
- Authority
- CN
- China
- Prior art keywords
- stirring
- filling
- discharge end
- cement
- concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000003756 stirring Methods 0.000 claims abstract description 83
- 239000004568 cement Substances 0.000 claims abstract description 48
- 230000007246 mechanism Effects 0.000 claims abstract description 28
- 239000011435 rock Substances 0.000 claims abstract description 23
- 239000002562 thickening agent Substances 0.000 claims abstract description 23
- 239000004575 stone Substances 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 239000002699 waste material Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000010878 waste rock Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 3
- 230000003137 locomotive effect Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 238000005204 segregation Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000004576 sand Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241000406668 Loxodonta cyclotis Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C9/00—General arrangement or layout of plant
- B28C9/02—General arrangement or layout of plant for producing mixtures of clay or cement with other materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
- B28C5/006—Methods for mixing involving mechanical aspects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
The invention discloses a high-concentration paste manufacturing system and a production method thereof, wherein the high-concentration paste manufacturing system comprises a deep cone thickener, a cement bin, a first stirring structure, a high-concentration stirring barrel, a fine stone draw shaft and a second stirring mechanism; the discharge end of the deep cone thickener and the discharge end of the cement bin are connected to the feed end of a first stirring structure, the discharge end of the first stirring structure is connected to the feed end of a high-concentration stirring barrel through a filling drill hole, the discharge end of the high-concentration stirring barrel and the discharge end of a fine-stone draw shaft are connected to the feed end of a second stirring mechanism, and the discharge end of the second stirring mechanism corresponds to an underground filling area through a filling pump; the first stirring structure is formed by connecting two double-shaft spiral stirrers in series, so that the uniform stirring effect is greatly enhanced, and the segregation condition of filling slurry is weakened; the waste rocks are directly mixed into the filling slurry after being crushed underground on the spot, so that the filling cost and difficulty are reduced.
Description
Technical Field
The invention relates to the technical field of mine filling, in particular to a high-concentration paste manufacturing system and a production method thereof.
Background
The mine needs to be backfilled after the mining is finished so as to avoid the negative conditions such as surface collapse and the like. The filling system can be divided into a dry filling system, a water sand filling system and a cemented filling system according to filling materials, the dry filling system has more operation links, low filling capacity and large dust, is not compact enough to be filled, and is generally rarely used except for small mines or worked-out goafs; the water sand filling system adopts non-cemented tailings, river sand or rod-milled sand to fill a chamber or a stud, and is suitable for the condition that an ore body is layered, the thickness is 1.5-2.5m, the inclination angle is less than 20 degrees, a top bottom plate is stable, and the ore is softer; the cemented filling is generally prepared by mixing broken stones, river sand or tailings or gobi aggregate as aggregate with cement or lime cementing materials to form slurry or paste, and conveying the slurry or paste to a filling area for filling in a pipeline pumping or gravity self-flowing mode. In order to improve the strength of a filling body, a waste rock crushing system is built near an earth surface filling station, waste rocks are crushed into fine rocks and added into filling slurry, and the stirred filling slurry is pumped to an underground filling mining area through a filling industry pump. Therefore, how to reduce the filling cost and avoid the segregation phenomenon of the filling slurry for the filling mode of adding the waste rock to the filling slurry is a technical problem which needs to be solved by the technicians in the field at present.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides the high-concentration paste manufacturing system and the production method thereof, which can effectively reduce the filling cost and avoid the segregation phenomenon of slurry.
The technical scheme is as follows: in order to achieve the purpose, the high-concentration paste manufacturing system comprises a deep cone thickener, a cement bin, a first stirring structure, a high-concentration stirring barrel, a fine stone draw shaft and a second stirring mechanism; the discharge end of deep cone thickener and the discharge end of cement bin are connected in the feed end of first stirring structure, the discharge end of first stirring structure is connected in the feed end of high concentration agitator through filling the drilling, the discharge end of high concentration agitator and the discharge end of fine stone elephant trunk are connected in the feed end of second rabbling mechanism, the discharge end of second rabbling mechanism is through filling the pump and corresponding to filling the district in the pit.
Furthermore, the deep cone thickener and the cement bin are at least respectively provided with two seats.
Further, the diameter size of the deep cone thickener is 18 m.
Further, the discharge end of the deep cone thickener and the discharge end of the cement bin are connected to the feed end of the first stirring structure through a mixing hopper; the mixing hopper is connected with a water supply pipe.
Further, the first stirring structures are arranged in parallel in a double-sleeve mode; the first stirring structure is formed by connecting two double-shaft spiral stirrers in series.
Further, the feeding end of the fine ore pass is connected with the discharging end of the vibration ore drawing machine through a conveyor belt, and the feeding end of the vibration ore drawing machine corresponds to the waste ore pass; and a quantitative feeder is arranged at the discharge end of the fine stone chute.
Furthermore, the feed end of the second stirring mechanism is connected with a water supply pipe, and the second stirring mechanisms are arranged in parallel in a double-sleeve mode; the second stirring mechanism adopts a double-shaft spiral stirrer.
Further, a production method of the high-concentration paste manufacturing system comprises the following steps,
step one, filling tailings are thickened to 64% -75% by the deep cone thickener and then conveyed into a first stirring structure;
conveying cement to a stirring station through a cement tanker, stirring, and conveying the cement to the cement bin, wherein the cement bin conveys the cement to the first stirring structure through a spiral feeding structure;
step three, the first stirring structure is used for stirring the tailings and the cement in two stages and then injecting the tailings and the cement into a high-concentration stirring barrel through filling and drilling; conveying the underground waste rocks to a drop shaft ore discharging chamber by an electric locomotive and dumping the underground waste rocks to the waste rock drop shaft, crushing the underground waste rocks into fine rocks with the particle size of less than 12mm by a crushing mechanism of the vibration ore drawing machine, and conveying the fine rocks to a fine rock drop shaft by the conveying belt;
and step four, fully mixing the mixture of the tailings and the cement with the fine stones in the second stirring mechanism, and conveying the filling slurry formed after mixing to filling areas at various positions in the well.
Has the advantages that: the high-concentration paste manufacturing system and the production method thereof can effectively reduce the filling cost and avoid the segregation phenomenon of slurry, and include but are not limited to the following technical effects:
1) the first stirring structure is formed by connecting two double-shaft spiral stirrers in series, so that the uniform stirring effect is greatly enhanced, and the segregation condition of filling slurry is weakened;
2) the original filling method of lifting the waste rock to the ground surface and then crushing is changed, the waste rock is transferred to the underground and crushed, and then is directly mixed with filling slurry, so that the filling cost and difficulty are reduced.
Drawings
FIG. 1 is a running frame diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in the attached figure 1: a high-concentration paste manufacturing system comprises a deep cone thickener 11, a cement bin 12, a first stirring structure 13, a high-concentration stirring barrel 2, a fine stone draw shaft 21 and a second stirring mechanism 22; the discharge end of the deep cone thickener 11 and the discharge end of the cement bin 12 are connected to the feed end of a first stirring structure 13, the discharge end of the first stirring structure 13 is connected to the feed end of a high-concentration stirring barrel 2 through a filling drill hole 3, the discharge end of the high-concentration stirring barrel 2 and the discharge end of a fine stone chute 21 are connected to the feed end of a second stirring mechanism 22, and the discharge end of the second stirring mechanism 22 corresponds to an underground filling area through a filling pump 221; the underground broken stone is crushed into fine stone, and the whole tailings, the fine stone and the cement paste are filled underground, so that the discharge of mine waste stone, tailings and waste water is reduced to the maximum extent, the land resource occupied by the surface of a mine is reduced, and meanwhile, the filling cost is reduced and the problem of separation of filling slurry is avoided.
The deep cone thickener 11 is used for conveying the filled tailings to the first stirring structure 13 after thickening, stirring the filled tailings and cement conveyed by the cement bin 12, and injecting water while stirring; the first stirring structure 13 adopts two-stage stirring to increase the stirring stroke of the mixture, so that the mixture can be more fully mixed together; the mixture of the tailings and the cement is conveyed to a high-concentration stirring barrel 2, and then is put into a second stirring mechanism 22 together with crushed fine stones to be fully mixed to prepare filling slurry, and then the filling slurry is pumped to filling mining areas in the pit through a filling industrial pump.
The deep cone thickener 11 and the cement bin 12 are at least respectively provided with two seats; to meet the efficiency requirement of the down-hole filling, the deep cone thickener 11 and the cement silo 12 for supplying raw materials are provided with double numbers to increase the flow rate of the blanking.
The diameter of the deep cone thickener 11 is 18 m.
The discharge end of the deep cone thickener 11 and the discharge end of the cement bin 12 are connected to the feed end of the first stirring structure 13 through a mixing hopper 111; the mixing hopper 111 is connected with a water supply pipe 4.
The first stirring structures 13 are arranged in parallel in a double-sleeve mode; the first stirring structure 13 is formed by connecting two double-shaft spiral stirrers in series; the first stirring structures 13 are provided with two sets which can process the baits from the deep cone thickener 11 and the cement bin 12 in time, and each set of the first stirring structures 13 is arranged in a two-stage series connection mode so that the stirring time can be prolonged, and the stirring effect is further improved.
The feed end of the fine ore chute 21 is connected to the discharge end of a vibratory ore-drawing machine 212 through a conveyor belt 211, the feed end of the vibratory ore-drawing machine 212 corresponding to the waste ore chute 213; the discharge end of the fine stone chute 21 is provided with a constant feeder 214; the vibration ore drawing machine 212 crushes the waste rocks into fine rocks through the crushing device, and mixes and refills the fine rocks with the full-tailings slurry through the fine rock chute 21, so that the original filling method of lifting the waste rocks to the ground surface for crushing is changed, and the filling cost and difficulty are reduced.
The feed end of the second stirring mechanism 22 is connected with a water supply pipe 4, and the second stirring mechanism 22 is arranged in parallel; the second stirring mechanism 22 is a twin-screw stirrer.
Comprises the following steps of (a) carrying out,
step one, after the filling tailings are thickened to 64% -75% by the deep cone thickener 11, conveying the thickened tailings into the first stirring structure 13;
transporting cement to a stirring station through a cement tanker, stirring, and then transporting the cement to the cement bin 12, wherein the cement bin 12 transports the cement to the first stirring structure 13 through a spiral feeding structure;
step three, the first stirring structure 13 is used for stirring tailings and cement in two stages and then injecting the tailings and the cement into the high-concentration stirring barrel 2 through a filling drill hole 3; the underground waste rocks are transported to a drop shaft ore discharging chamber by an electric locomotive and are dumped to the waste rock drop shaft 213, the underground waste rocks are crushed into fine rocks with the size less than 12mm by a crushing mechanism of the vibration ore drawing machine 212 and then are sent to a fine rock drop shaft 21 by the conveyor belt 211;
and step four, sufficiently mixing the mixture of the tailings and the cement and the fine stones in the second stirring mechanism 22, and conveying the mixed filling slurry to filling areas at various positions in the well.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (8)
1. A high-concentration paste manufacturing system is characterized in that: comprises a deep cone thickener (11), a cement bin (12), a first stirring structure (13), a high-concentration stirring barrel (2), a fine stone draw shaft (21) and a second stirring mechanism (22); the discharge end of deep cone thickener (11) and the discharge end of cement bin (12) are connected in the feed end of first stirring structure (13), the discharge end of first stirring structure (13) is connected in the feed end of high concentration agitator (2) through filling drilling (3), the discharge end of high concentration agitator (2) and the discharge end of fine stone ore pass shaft (21) are connected in the feed end of second rabbling mechanism (22), the discharge end of second rabbling mechanism (22) passes through filling pump (221) and corresponds to the district that fills in the pit.
2. The high-concentration paste manufacturing system according to claim 1, wherein: the deep cone thickener (11) and the cement bin (12) are at least respectively provided with two seats.
3. The high-concentration paste manufacturing system according to claim 1, wherein: the diameter of the deep cone thickener (11) is 18 m.
4. The high-concentration paste manufacturing system according to claim 1, wherein: the discharge end of the deep cone thickener (11) and the discharge end of the cement bin (12) are connected to the feed end of the first stirring structure (13) through a mixing hopper (111); the mixing hopper (111) is connected with a water supply pipe (4).
5. The high-concentration paste manufacturing system according to claim 1, wherein: the first stirring structures (13) are arranged in parallel in a double-sleeve mode; the first stirring structure (13) is formed by connecting two double-shaft spiral stirrers in series.
6. The high-concentration paste manufacturing system according to claim 1, wherein: the feeding end of the fine stone chute (21) is connected with the discharging end of the vibration ore drawing machine (212) through a conveyor belt (211), and the feeding end of the vibration ore drawing machine (212) corresponds to the waste stone chute (213); and a quantitative feeder (214) is arranged at the discharge end of the fine stone chute (21).
7. The high-concentration paste manufacturing system according to claim 1, wherein: the feed end of the second stirring mechanism (22) is connected with a water supply pipe (4), and the second stirring mechanism (22) is arranged in parallel in a double-sleeve mode; the second stirring mechanism (22) adopts a double-shaft spiral stirrer.
8. The production method of a high concentration paste manufacturing system according to any one of claims 1 to 7, characterized in that: comprises the following steps of (a) carrying out,
step one, filling tailings are thickened to 64% -75% by the deep cone thickener (11) and then conveyed into a first stirring structure (13);
step two, conveying cement to a mixing station through a cement tanker, mixing, and conveying the cement into the cement bin (12), wherein the cement bin (12) conveys the cement to a first mixing structure (13) through a spiral feeding structure;
thirdly, the first stirring structure (13) is used for stirring the tailings and the cement in two stages and then injecting the tailings and the cement into the high-concentration stirring barrel (2) through a filling drill hole (3); the underground waste rocks are conveyed to a drop shaft ore discharging chamber by an electric locomotive and are dumped to the waste rock drop shaft (213), the underground waste rocks are crushed into fine rocks with the particle size of less than 12mm by a crushing mechanism of the vibration ore drawing machine (212), and then the fine rocks are conveyed to a fine rock drop shaft (21) through the conveyor belt (211);
and step four, fully mixing the mixture of the tailings and the cement and the fine stones in the second stirring mechanism (22), and conveying the mixed filling slurry to filling areas at various positions in the well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210225771.5A CN114474408A (en) | 2022-03-09 | 2022-03-09 | High-concentration paste manufacturing system and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210225771.5A CN114474408A (en) | 2022-03-09 | 2022-03-09 | High-concentration paste manufacturing system and production method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114474408A true CN114474408A (en) | 2022-05-13 |
Family
ID=81485648
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210225771.5A Pending CN114474408A (en) | 2022-03-09 | 2022-03-09 | High-concentration paste manufacturing system and production method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114474408A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2260604A1 (en) * | 1998-12-31 | 2000-06-30 | Her Majesty In Right Of Canada As Represented By The Minister Of Natural Resources | Apparatus for producing high density slurry and paste backfills |
| CN201361943Y (en) * | 2009-02-25 | 2009-12-16 | 冀中能源邯郸矿业集团有限公司 | Mining filling-slurry preparing system |
| CN102661170A (en) * | 2012-03-16 | 2012-09-12 | 滕州市级翔(集团)级索煤矿 | Process and device for continuously stirring and filling paste-like body for mine manufactured by use of building waste |
| CN108661704A (en) * | 2018-05-02 | 2018-10-16 | 长沙矿山研究院有限责任公司 | A kind of concentrator adds sand warehouse separation arrangement filling system and technique |
| CN108661703A (en) * | 2018-04-28 | 2018-10-16 | 长沙矿山研究院有限责任公司 | coarse fraction tailing paste filling method and filling system |
| CN112814732A (en) * | 2021-02-20 | 2021-05-18 | 中南大学 | Preparation of mixed ground paste of barren rock and tailings and pump sending filling device |
-
2022
- 2022-03-09 CN CN202210225771.5A patent/CN114474408A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2260604A1 (en) * | 1998-12-31 | 2000-06-30 | Her Majesty In Right Of Canada As Represented By The Minister Of Natural Resources | Apparatus for producing high density slurry and paste backfills |
| CN201361943Y (en) * | 2009-02-25 | 2009-12-16 | 冀中能源邯郸矿业集团有限公司 | Mining filling-slurry preparing system |
| CN102661170A (en) * | 2012-03-16 | 2012-09-12 | 滕州市级翔(集团)级索煤矿 | Process and device for continuously stirring and filling paste-like body for mine manufactured by use of building waste |
| CN108661703A (en) * | 2018-04-28 | 2018-10-16 | 长沙矿山研究院有限责任公司 | coarse fraction tailing paste filling method and filling system |
| CN108661704A (en) * | 2018-05-02 | 2018-10-16 | 长沙矿山研究院有限责任公司 | A kind of concentrator adds sand warehouse separation arrangement filling system and technique |
| CN112814732A (en) * | 2021-02-20 | 2021-05-18 | 中南大学 | Preparation of mixed ground paste of barren rock and tailings and pump sending filling device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112814732A (en) | Preparation of mixed ground paste of barren rock and tailings and pump sending filling device | |
| CN110282894A (en) | A kind of coal gangue haydite and preparation method thereof | |
| CN103590851A (en) | Underground waste-rock concrete preparation, pumping and filling system and method | |
| CN106884675A (en) | The technique that a kind of consolidated fill slurry fills underground goaf | |
| CN103133033A (en) | Mine phosphogypsum cemented fill slurrying process | |
| CN106939796A (en) | The method and system that filling slurry fills underground goaf are prepared using efflorescent sand | |
| CN106194249B (en) | A kind of coal mine gob totipotency Paste-filling System and method | |
| CN112796829A (en) | Underground original gangue filling system and method for caving area of fully mechanized caving face | |
| CN102661170A (en) | Process and device for continuously stirring and filling paste-like body for mine manufactured by use of building waste | |
| CN110561617A (en) | Full-tailing slurry filling system with low density and high strength | |
| CN201857994U (en) | Downhole gangue sorting and filling system | |
| CN207813647U (en) | Coordinative composition of equipments system for pumped downhole waste filling exploitation | |
| CN116241319B (en) | Paste filling system and dual-mode joint arrangement method thereof | |
| CN114474408A (en) | High-concentration paste manufacturing system and production method thereof | |
| CN116378750A (en) | Underground dynamic filling method for gangue paste | |
| CN214303937U (en) | Preparation of mixed ground paste of barren rock and tailings and pump sending filling device | |
| WO2016065906A1 (en) | Ground material feeding system and feeding process for solid backfilling mining of coal mine | |
| CN215029832U (en) | Goaf filling equipment | |
| CN210660199U (en) | Abandoned mine backfilling system and backfilling mine | |
| CN210003328U (en) | underground movable gravel cemented filling system | |
| CN114542171A (en) | Improvement method of overburden rock isolation grouting filling material | |
| CN203614129U (en) | Underground waste rock concrete preparation, pumping and filling system | |
| CN113638770A (en) | Goaf filling equipment and method and goaf filling structure | |
| CN219663873U (en) | Underground paste filling system | |
| CN113509995B (en) | Goaf filling equipment and goaf filling method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |