CN104005766A - Chemical method for weakening of top coal - Google Patents
Chemical method for weakening of top coal Download PDFInfo
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- CN104005766A CN104005766A CN201410198750.4A CN201410198750A CN104005766A CN 104005766 A CN104005766 A CN 104005766A CN 201410198750 A CN201410198750 A CN 201410198750A CN 104005766 A CN104005766 A CN 104005766A
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Abstract
The invention discloses a chemical method for weakening of top coal. The method successively comprises the following steps: selecting a coal seam with vitrinite reflectance of R<o, max> and hard, complete and difficult-to-cave top coal; perforating drilling holes in the coal seam and sealing the holes; preparing an alkali solution, injecting the prepared alkali solution into the drilling holes and carrying out soaking for a period of time; organizing subsequent production according to conventional top coal caving procedures; and comparing the chemical method with traditional physical measures like waterflooding cracking and loosening blasting so as to examine caving improvement effects of the chemical method on the coal seam. According to the invention, the injected alkali solution does not lead to cracks of the coal seam and chemically reacts with the coal seam to rapidly reduce mechanical strength of the coal seam, so caving and drawing characteristics of the coal seam are obviously improved. The method has the advantages of simple operation, good controllability, low cost and a good top coal weakening effect and effectively overcomes problems like difficult top coal caving and a low mining rate of low-rank coal.
Description
Technical field
The invention belongs to coal mining field, specifically improve the production technique of low coal rank hard coal seam caving effect.
Background technology
Current, the thick and super high seam mining of efficient intensify of China is mainly mining technology, and top coal caving is a kind of important technology that solves high seam, super high seam exploitation.Can realize once adopt entirely thick, thereby reduce material consumption, improve coal recovery rate, effectively solve spontaneous fire problem, realize the effect of high-yield and high-efficiency.But at present also there are many difficult problems in top coal caving, as hard coal seam crushing voerhead coal be caving difficulty, be difficult for inbreak, resource recovery is low etc.The putting property of emitting that how to improve top coal is a problem studying for a long period of time.
At present China's top coal reduction technology mainly contain that water filling is softening, the method such as high pressure water injection fracturing and explosion.Water filling weakens top coal technology and exists on top board sealing of hole difficulty large, and caving validity, ageing poor problem; It is better that explosion caving method solves caving problem effect, but poor controllability, the process of blowing out easily produces a large amount of dust, worsens environment on coalface, and the spark of generation, also may cause gas explosion, causes casualties and property loss.
In coal due to vitrinite reflectance < 0.6%, contain the organic matters such as the humic acid that can be dissolved by alkali in a large number, behind aqueous slkali soaking coal seam, coal body mechanical strength sharply reduces, and can reach to injecting aqueous slkali in coal seam the object that weakens top coal.Compared with weakening technique with traditional top coal, this technological operation is simple, and controllability is good, and with low cost, and top coal weakens effective, efficiently solves the problems such as roof coal caving difficulty in top coal caving, recovery ratio are low.
Summary of the invention
For solving roof coal caving difficulty in top coal caving, problem that recovery ratio is low, the present invention adopts following technical scheme:
Comprise the following steps successively:
(1), select vitrinite reflectance R
o, maxthe coal seam that < 0.6% and top coal be hard, complete, be difficult to be caving;
(2), by different modes to drilling, then sealing of hole in coal seam;
(3), configuration aqueous slkali, and inject the aqueous slkali that configures in boring, ensure that soak time is more than 6 hours;
(4), organize subsequent production according to conventional top coal caving operation;
(5), with the physical measure comparison such as traditional waterflood fracturing or loosening blasting, inspection chemical method improves coal seam caving effect.
Described step (1) is selected vitrinite reflectance R
o, maxthe coal seam that < 0.6% and top coal be hard, complete, be difficult to be caving;
[OH-] > 1mol/L in described step (3), [OH-] can with coal generation chemical reaction, coal body mechanical strength sharply reduces, thereby reaches the object of broken top coal.
In described step (3), determine the soak time principle of aqueous slkali: jet coal soak time is not less than 10 hours, and brown coal soak time is not less than 6 hours.
Adopt technique scheme, when inject aqueous slkali contact with coal seam after, can with organic component generation chemical reaction in coal, coal body mechanical strength is sharply reduced, cause crushing voerhead coal.How caving is in time the important ring in top coal caving, and the present invention weakens for realizing top coal, broken top coal, and caving in time and raising top coal recovery rate are significant.
The present invention is mainly for vitrinite reflectance R
o, maxcomplete, the hard top coal of < 0.6% is difficult to be caving coal seam, and aqueous slkali is injected to coal seam, and the pressure producing by solution makes generation crack, coal seam, and aqueous slkali reacts with the organic component in coal simultaneously, reduces stress of coal seam, further weakens top coal.Have method simple to operate, controllability is good, and with low cost, and top coal weakens effective, efficiently solves the problems such as roof coal caving difficulty in top coal caving, recovery ratio are low.
Detailed description of the invention
Hereinafter, will describe more fully now the present invention, show various embodiment.But the present invention can implement in many different forms, and should not be interpreted as being confined to embodiment set forth herein.On the contrary, it will be thorough with completely providing these embodiment to make the disclosure, and scope of the present invention is conveyed to those skilled in the art fully.
(1), select brown coal and hard, the complete coal seam that is difficult to be caving of top coal;
(2), in top coal caving process, to coal seam, support top drilling;
(3), adopt the mode sealing of holes such as cement or polyurethane;
(4), the aqueous slkali of configuration [OH-]=2mol/L;
(5), in boring, inject the aqueous slkali that configures to certain pressure, as 10MPa, and soak more than 6 hours;
(6), organize subsequent production according to conventional top coal caving operation;
(7), with the physical measure comparison such as traditional waterflood fracturing or loosening blasting, inspection chemical method improves the effect of coal seam caving.
The foregoing is only embodiments of the invention, be not limited to the present invention.The present invention can have various suitable changes and variation.All any amendments of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in.
Claims (4)
1. the chemical method that top coal weakens, is characterized in that: comprise the following steps successively:
(1), select vitrinite reflectance R
o, maxthe coal seam that < 0.6% and top coal be hard, complete, be difficult to be caving;
(2), by variety of way to drilling, then sealing of hole in coal seam;
(3), configuration aqueous slkali, and inject the aqueous slkali soaking that configures more than 6 hours in boring;
(4), organize subsequent production according to conventional top coal caving operation;
(5), with the physical measure comparison such as traditional waterflood fracturing or loosening blasting, inspection chemical method improves the effect of coal seam caving.
2. the chemical method that top coal weakens according to claim 1, is characterized in that: described step (2) is specially in top coal caving process, to coal seam, support top drilling; Adopt the mode sealing of holes such as cement or polyurethane.
3. the chemical method that top according to claim 1 coal weakens, is characterized in that: in described step (4), aqueous slkali refers to the solution of [OH-] > 1mol/L.
4. the chemical method that top according to claim 1 coal weakens, is characterized in that: described step (3) further comprises in boring injects the aqueous slkali configuring to certain pressure, as 10MPa, and soaks more than 6 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410198750.4A CN104005766A (en) | 2014-05-12 | 2014-05-12 | Chemical method for weakening of top coal |
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| CN201410198750.4A CN104005766A (en) | 2014-05-12 | 2014-05-12 | Chemical method for weakening of top coal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104763426A (en) * | 2015-02-12 | 2015-07-08 | 太原理工大学 | Method for low temperature precracking of thick hard difficult-to-break coal mine top board by liquid nitrogen |
| CN105909246A (en) * | 2016-06-30 | 2016-08-31 | 太原理工大学 | Horizontal segment blast cracking and chemical weakening method for igneous rock in thick coal seam |
| CN106285679A (en) * | 2016-08-11 | 2017-01-04 | 太原理工大学 | A kind of presplitting and the method softening igneous rock tight roof |
| CN106703808A (en) * | 2016-07-06 | 2017-05-24 | 中国矿业大学 | Method for increasing end top coal recovery rate by means of thick coal seam fully-mechanized caving face mining roadway drilling presplitting |
| CN110685688A (en) * | 2019-09-27 | 2020-01-14 | 中国矿业大学 | Coal mine surrounding rock control method based on chemical modification |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104763426A (en) * | 2015-02-12 | 2015-07-08 | 太原理工大学 | Method for low temperature precracking of thick hard difficult-to-break coal mine top board by liquid nitrogen |
| CN105909246A (en) * | 2016-06-30 | 2016-08-31 | 太原理工大学 | Horizontal segment blast cracking and chemical weakening method for igneous rock in thick coal seam |
| CN105909246B (en) * | 2016-06-30 | 2018-02-16 | 太原理工大学 | A kind of chemical weakening method of high seam moderate heat diagenesis horizontal fragmentation blast cracking |
| CN106703808A (en) * | 2016-07-06 | 2017-05-24 | 中国矿业大学 | Method for increasing end top coal recovery rate by means of thick coal seam fully-mechanized caving face mining roadway drilling presplitting |
| CN106285679A (en) * | 2016-08-11 | 2017-01-04 | 太原理工大学 | A kind of presplitting and the method softening igneous rock tight roof |
| CN106285679B (en) * | 2016-08-11 | 2018-07-10 | 太原理工大学 | A kind of presplitting and the method for softening igneous rock tight roof |
| CN110685688A (en) * | 2019-09-27 | 2020-01-14 | 中国矿业大学 | Coal mine surrounding rock control method based on chemical modification |
| CN110685688B (en) * | 2019-09-27 | 2021-01-01 | 中国矿业大学 | Coal mine surrounding rock control method based on chemical modification |
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