AU2018376026B2 - Microbial modification filling-based coal mining method - Google Patents
Microbial modification filling-based coal mining method Download PDFInfo
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- AU2018376026B2 AU2018376026B2 AU2018376026A AU2018376026A AU2018376026B2 AU 2018376026 B2 AU2018376026 B2 AU 2018376026B2 AU 2018376026 A AU2018376026 A AU 2018376026A AU 2018376026 A AU2018376026 A AU 2018376026A AU 2018376026 B2 AU2018376026 B2 AU 2018376026B2
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- Prior art keywords
- filling
- microbial
- grouting
- conveying
- calcified
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
Abstract
A microbial modification filling-based coal mining method, comprising the operation steps of performing ground microbial calcification on a filling material, conveying the calcified filling material to a goaf for tamping and filling, and then performing microbial grouting on a filling body, where microbial grouting and filling is performed after each step of coal mining is completed. By means of microbial filling, the compressive strength of the filling body is effectively improved, environment-friendliness is realized, and the biochemical mechanism-based microbial filling-based coal mining technology in a high-stress deep part is taken to a new direction.
Description
[0001] The present invention relates to a method for microbial modified filling coal mining, and belongs to the technical field of solid filling coal mining.
[0002] As the depth of mining increases, deep mining of coal resources goes to the deep gradually. For a deep mining environment, a filling body is fully compacted, and roof sag is further increased, resulting in a poor filling effect and severe movement of roof strata. Therefore, there is a need to improve filling materials to deal with problems caused by high crustal stress and high osmotic pressure.
[0003] In order to adapt to the deep mining environment, the filling material is prepared and improved by using a means of microbial solidification. The microbial solidification, namely, a microbial induced calcium carbonate precipitation technology, is a novel soil solidification technology, and the principle thereof is to provide a nitrogen source and a calcium ion source to some specific microorganisms, causing calcium carbonate crystals with a gelation effect to be rapidly released out, so as to realize the effect of solidifying loose sand grains. In view of the above, the technical problem that must be solved in microbial filling coal mining is how to organically combine the means of microbial solidification with a solid filling coal mining technology to achieve synergistic mining.
Technical Problem
[0004] In order to overcome the above deficiencies of the prior art, the present invention provides a method for microbial modified filling coal mining, which can greatly improve the compressive performance of the granular filling body, has stronger and more stable supporting capacity for the coal seam roof, has a simple process, and is green and environmentally friendly.
Technical Solution
[0005] A technical solution adopted by the present invention to solve the technical problem comprises operation steps of performing microbial calcification on a solid waste filling material on the ground, conveying the calcified filling material to a goaf for tamping and filling, then performing microbial grouting on a filling body, and performing the microbial grouting and filling after completion of coal mining at each interval.
Advantageous Effect
[0006] Compared with the prior art, in the method for microbial modified filling coal mining of the invention, the solid filling coal mining technology is combined with the microbial grouting technology. After the strength of the solid waste filling material is improved by the microbial calcification and modification, the filling body in the form of a microbial cemented solid waste is formed by the grouting in the goaf, realizing solidification of solid waste granular particles, providing higher compressive capacity, and effectively controlling strata movement and surface subsidence. Meanwhile, the microbial grout used in this method is a complete solution grout material which has an obvious consolidation effect. This method is an environmentally friendly and energy-saving process, which greatly improves the compressive performance of the granular filling body and has stronger and more stable supporting capacity for the coal seam roof. Also, this method has a simple process, is green and environmentally friendly, and provides a new direction for the microbial filling coal mining technology based on a biochemical mechanism under deep high stress conditions.
[0007] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0008] Fig. 1 is a structural layout view of an embodiment of the present invention.
[0009] In the drawing: 1, solid waste filling material; 2, conveyor; 3, crusher; 4, belt conveyor; 5, reaction cabin; 6, bacterial suspension culture tank; 7, nutrient solution tank; 8, cementation reagent tank; 9, conveying pipeline; 10, high pressure chemical grouting pump; 11, filling drill hole; 12, vertical feeding well; 13, filling coal mining hydraulic powered support; 14, bottom unloading type scraper conveyor; 15, grouting
pipe; 16, storage tank; 17, calcified waste filling material; and 18, filling body.
[0010] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is apparent that the described embodiments are part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts should fall within the protection scope of the present invention.
[0011] The present invention provides a method for microbial modified filling coal mining which comprises operation steps of performing microbial calcification on a filling material on the ground, conveying the calcified filling material to a goaf for tamping and filling, then performing microbial grouting on a filling body, and performing the microbial grouting and filling after completion of coal mining at each interval. According to the present invention, a solid filling coal mining technology is combined with a microbial grouting technology. After the strength of the solid waste filling material is improved by the modification, the filling body in the form of a microbial cemented solid waste is formed by the grouting in the goaf, realizing solidification of solid waste granular particles.
[0012] Fig. 1 shows a structural schematic view of a preferred embodiment of the present invention in which specific steps of the method for microbial filling coal mining are as follows:
[0013] 1) conveying a solid waste filling material 1 stacked on the ground to a crusher 3 by a conveyor 2 to be crushed, and then conveying the crushed solid waste filling material 1 to a reaction cabin 5 by a belt conveyor 4;
[0014] 2) arranging a bacterial suspension culture tank 6, a nutrient solution tank 7 and a cementation reagent tank 8 on the ground, which are respectively connected with the reaction cabin 5 and a high pressure chemical grouting pump 10 by conveying pipelines 9;
[0015] 3) disposing an automated equipment for quantitative distribution of a material to convey a bacterial suspension and a cementation reagent to the reaction cabin 5 precisely according to a configuration proportion, so as to calcify the surface of the solid waste filling material 1 and enhance the strength of the material, obtaining a surface calcified waste filling material 17;
[0016] 4) drilling a filling drill hole 11 from the ground to the underground, disposing a wall protection sleeve in the filling drill hole 11 which is connected to the conveying pipelines 9 at bottom, and conveying a microbial slurry to storage tanks 16 of the bacterial suspension, a nutrient solution and the cementation reagent arranged in a workface via the conveying pipelines 9 by the high pressure chemical grouting pump , wherein the bacterial suspension, the nutrient solution and the cementation reagent are independently stored and respectively conveyed through the same conveying pipeline 9, and after the conveying process of one solution is completed, the pipeline is cleaned, and then another solution is conveyed;
[0017] 5) putting the calcified waste filling material 17 into the underground from a vertical feeding well 12, conveying the calcified waste filling material 17 to the workface by the underground belt conveyor, cutting one cut of coal, advancing a powered support and pushing forwards the conveyor according to a conventional method for coal mining, and tamping and filling a falling material by using a bottom unloading type scraper conveyor 14 suspended at rear of a filling coal mining hydraulic powered support 13;
[0018] 6) after completing one filling interval on the workface, burying grouting pipes into top, middle and bottom of a filling body 18 by a bottom-up, segmented grouting construction method, and pouring the solutions in the storage tanks into the grouting pipes in a step-by-step manner from top to bottom in the order of top, middle and bottom via a high pressure grout jetting pipe by using a high pressure jetting gun;
[0019] 7) the process of pouring the solutions into each of the grouting pipes is: first, injecting a certain amount of the bacterial suspension according to the volume of the solidified filling body, then pouring the nutrient solution at a constant speed, and finally, continuously pouring the cementation reagent, wherein grouting pressure is set at 3-5 MPa to sufficiently diffuse the microbial slurry, and the grouting is stopped when a set injection rate is reached;
[0020] 8) repeating step 7) to complete multiple cycles of the grouting; and
[0021] 9) after the grouting is completed, repeating steps 5), 6) and 7) to perform the next interval of the filling coal mining, until the microbial filling coal mining on the whole workface is completed.
[0022] In this embodiment, the bacterial suspension is a Bacillus strain with a high yield of urease, the nutrient solution is a CaCl2 solution, and the cementation reagent is a urea-CaCl2 reagent. Preferably, the solid waste filling material 1 is selected from those with a particle size grading of less than 20 mm to facilitate the microbial cementation.
[0023] The foregoing descriptions are merely preferred embodiments of the present invention, but are not intended to limit the present invention in any form, and any simple modifications and equivalent changes made to the foregoing embodiments according to the technical essence of the present invention should fall within the protection scope of the present invention.
Claims (18)
1. A method of microbial modified filling performed after completion of coal mining, the method comprising the steps of
a) performing microbial calcification on a filling material on the ground to form calcified filling material;
b) conveying the calcified filling material to a goaf for tamping and filling to form a filling body; and
c) performing microbial grouting on the filling body.
2. The method of microbial modified filling according to claim 1, wherein the method is performed after completion of each interval of coal mining
.
3. The method of microbial modified filling according to either of claim 1 or 2, wherein the step of performing microbial calcification includes the steps of:
a) conveying a solid waste filling material (1) stacked on the ground to a crusher (3) by a conveyor (2) to be crushed, and
b) conveying the crushed solid waste filling material (1) to a reaction cabin (5) by a belt conveyor (4).
4. The method of microbial modified filling according to any one of claims 1 to 3, wherein the step of performing microbial calcification includes the steps of:
a) arranging a bacterial suspension culture tank (6), a nutrient solution tank (7) and a cementation reagent tank (8) at ground level the bacterial suspension culture tank (6), nutrient solution tank (7) and cementation reagent tank (8) each being respectively connected with the reaction cabin (5) and a high pressure chemical grouting pump (10) by conveying pipelines (9).
5. The method of microbial modified filling according to either of claims 3 or 4, wherein the step of performing microbial calcification includes the steps of:
a) disposing automated equipment for the quantitative distribution of a material to convey a bacterial suspension and a cementation solution to the reaction cabin
(5)in suitable proportions so as to obtain a surface calcified waste filling material (17).
6. The method of microbial modified filling according to any one of claims 1 to 5, wherein the step of conveying the calcified filling material includes the step of:
a) drilling a filling drill hole (11) from the ground to underground workings;
b) disposing a wall protection sleeve in the filling drill hole (11) which is connected to conveying pipelines (9) at a bottom end.
7. The method of microbial modified filling according to any one of claims 1 to 6, wherein the step of conveying the calcified filling material includes the step of:
a) conveying the bacterial suspension, a nutrient solution and the cementation reagent to storage tanks (16) for the bacterial suspension, the nutrient solution and the cementation reagent respectively, via the conveying pipelines (9) using a high pressure chemical grouting pump (10), the storage tanks (16) for the bacterial suspension, the nutrient solution and the cementation reagent being arranged at a workface.
8. The method of microbial modified filling according to any one of claims 1 to 7, wherein the step of conveying the calcified filling material includes the step of
a) transferring the calcified waste filling material (17) underground from a vertical feeding well (12).
9. The method of microbial modified filling according to any one of claims 1 to 8, wherein the step of conveying the calcified filling material includes the step of
a) conveying the calcified waste filling material (17) to the workface by the underground belt conveyor.
10. The method of microbial modified filling according to any one of claims 1 to 9, wherein the step of conveying the calcified filling material includes the step of:
a) cutting one cut of coal, advancing a powered support and pushing a conveyor forwards to form an interval; and
b) tamping and filling the interval behind the hydraulic powered support (13) using a suspended bottom unloading type scraper conveyor (14) to form a filling body (18).
11. The method of microbial modified filling according to claim 10, wherein the step of tamping and filling includes the step of
a) burying grouting pipes (15) into the top, middle and bottom of the filling body (18) by a bottom-up, segmented grouting construction method.
12. The method of microbial modified filling according to any one of claims 1 to 11, wherein the step of performing microbial grouting includes the step of
a) pumping the bacterial suspension, nutrient solution and cementation reagent in the storage tanks into the grouting pipes at high pressure.
13. The method of microbial modified filling according to claim 12, wherein the step of pumping bacterial suspension, nutrient solution and cementation reagent into the grouting pipes includes the step of:
a) injecting the bacterial suspension according to the volume of the solidified filling body; and
b) pumping the nutrient solution at a constant speed, and
c) continuously pumping the cementation reagent.
14. ,The method of microbial modified filling according to claim 13, wherein the step of continuously pumping the cementation reagent includes the step of:
a) pumping the cementation reagent at a grouting pressure of 3-5 MPa to sufficiently diffuse the microbial grout, and the grouting is stopped when a set injection rate is reached.
15. The method of microbial modified filling according to any one of claims 1 to 14, wherein the step of performing microbial grouting includes the step of:
a) repeating the steps of injecting the bacterial suspension according to the volume of the solidified filling body; pumping the nutrient solution and continuously pumping the cementation reagent to complete the grouting of an interval.
16. The method of microbial modified filling according to any one of claims 1 to 15, wherein the step of tamping and filling includes the step of
a) after the grouting is completed for an interval, repeating the step of tamping and filling and performing microbial grouting to grout the next interval until the
microbial filling of the whole workface is completed.
17. The method for microbial modified filling coal mining according to any one of claims 7 to 15, wherein the bacterial suspension is a Bacillus strain with a high yield of urease, the nutrient solution is a CaCl2 solution, and the cementation reagent is a urea-CaCl2 reagent.
18. The method for microbial modified filling coal mining according to any one of claims 3 to 17, wherein the solid waste filling material (1) is selected from those with a particle size grading of less than 20 mm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711225946.8 | 2017-11-29 | ||
| CN201711225946.8A CN108035769B (en) | 2017-11-29 | 2017-11-29 | A kind of modified filling coal mining method of microorganism |
| PCT/CN2018/112295 WO2019105162A1 (en) | 2017-11-29 | 2018-10-29 | Microbial modification filling-based coal mining method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2018376026A1 AU2018376026A1 (en) | 2019-11-07 |
| AU2018376026B2 true AU2018376026B2 (en) | 2021-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2018376026A Ceased AU2018376026B2 (en) | 2017-11-29 | 2018-10-29 | Microbial modification filling-based coal mining method |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN108035769B (en) |
| AU (1) | AU2018376026B2 (en) |
| WO (1) | WO2019105162A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108035769B (en) * | 2017-11-29 | 2019-04-02 | 中国矿业大学 | A kind of modified filling coal mining method of microorganism |
| CN108975787B (en) * | 2018-08-29 | 2020-09-01 | 中国矿业大学(北京) | Microbial cementing filling material for coal mine and preparation method thereof |
| CN109320192A (en) * | 2018-11-06 | 2019-02-12 | 中国矿业大学 | A kind of modified filler of microorganism and preparation method |
| CN110513111A (en) * | 2019-08-14 | 2019-11-29 | 中国矿业大学(北京) | A kind of cementing lane formula filling coal mining method of separation of solid and liquid filling type microorganism |
| CN112695739B (en) * | 2020-12-18 | 2021-09-21 | 中国矿业大学(北京) | Grouting reinforcement method for thick flowing sand layer under mining influence area building structure group |
| CN113884351B (en) * | 2021-09-03 | 2023-10-27 | 中国矿业大学 | Preparation method of magnetic sensitivity simulated lunar soil based on biological curing technology |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3340693A (en) * | 1965-02-15 | 1967-09-12 | William S Row | Method and apparatus for inducing hardening or cementing in a mass of back-fill in a mine opening |
| DE3932046C3 (en) * | 1989-09-26 | 1994-04-07 | Bergwerksverband Gmbh | Fracture field offset method |
| RU2186222C2 (en) * | 2000-02-01 | 2002-07-27 | Чучалин Лев Климентьевич | Composition of fill machine |
| RU2390633C1 (en) * | 2009-02-05 | 2010-05-27 | Учреждение Российской академии наук Институт горного дела Сибирского отделения РАН | Procedure for development of steeply pitching beds of coal |
| CN101586460B (en) * | 2009-06-02 | 2011-03-30 | 中国矿业大学 | Coal mining solid filling method |
| US8985902B2 (en) * | 2011-08-16 | 2015-03-24 | Golder Associates, Inc. | System and method for treating an excavation activity |
| CN104131829B (en) * | 2014-06-25 | 2016-05-04 | 中国矿业大学 | A kind of solid filling coal mining hydraulic supporting building and withdrawing frame method |
| CN105604552B (en) * | 2015-12-21 | 2017-10-10 | 冀中能源集团有限责任公司 | A kind of solid material filling coal mining gob-side entry retaining method |
| CN106321102B (en) * | 2016-09-08 | 2018-04-13 | 中国矿业大学 | A kind of closely knit strip filling coal-mining method of colliery solid |
| CN108035769B (en) * | 2017-11-29 | 2019-04-02 | 中国矿业大学 | A kind of modified filling coal mining method of microorganism |
-
2017
- 2017-11-29 CN CN201711225946.8A patent/CN108035769B/en active Active
-
2018
- 2018-10-29 AU AU2018376026A patent/AU2018376026B2/en not_active Ceased
- 2018-10-29 WO PCT/CN2018/112295 patent/WO2019105162A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN108035769B (en) | 2019-04-02 |
| AU2018376026A1 (en) | 2019-11-07 |
| CN108035769A (en) | 2018-05-15 |
| WO2019105162A1 (en) | 2019-06-06 |
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| HB | Alteration of name in register |
Owner name: CHINA UNIVERSITY OF MINING AND TECHNOLOGY Free format text: FORMER NAME(S): CHINA UNIVERSITY OF MINING AND TECHNOLOGY; XUZHOU ZHONGKUANG BACKFILLING&MINING TECHNOLOGY CO., LTD Owner name: XUZHOU ZHONGKUANG BACKFILLING & MINING TECHNOLOGY Free format text: FORMER NAME(S): CHINA UNIVERSITY OF MINING AND TECHNOLOGY; XUZHOU ZHONGKUANG BACKFILLING&MINING TECHNOLOGY CO., LTD |
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| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |