Chemical method for weakening of top coal

A chemical method and top-coal technology, which is applied in earth square drilling, surface mining, underground mining, etc., can solve problems such as low recovery rate and difficulty in top-coal caving

Inactive Publication Date: 2014-08-27
山西蓝焰煤层气集团有限责任公司 +1
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Problems solved by technology

[0005] In order to solve the problems of difficult top coal caving and low recovery r

Method used

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Embodiment Construction

[0017] In the following text, the invention will now be described more fully, illustrating various embodiments. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0018] (1) Choose a coal seam with lignite and top coal that is hard, complete and difficult to collapse;

[0019] (2) During the mining process of top-coal caving, drilling holes are drilled into the coal seam above the support;

[0020] (3) Use cement or polyurethane to seal the hole;

[0021] (4), configure [OH-]=2mol / L alkali solution;

[0022] (5) Inject the prepared alkali solution into the borehole to a certain pressure, such as 10MPa, and soak for more than 6 hours;

[0023] (6) Follow-up production shall be organized according to the conventional...

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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 [0001] The invention belongs to the field of coal mining, in particular to a mining technology for improving the caving effect of low-rank hard coal seams. Background technique [0002] At present, the high-efficiency and intensive mining of thick and extra-thick coal seams in my country is mainly the fully mechanized top-coal caving technology, and top-coal caving mining is an important technology to solve the mining of thick and extra-thick coal seams. It can realize full thickness mining at one time, thereby reducing material consumption, improving coal recovery rate, effectively solving the problem of spontaneous combustion, and achieving high-yield and high-efficiency effects. However, there are still many problems in top-coal caving mining, such as difficulty in breaking and caving top-coal in hard coal seams, not easy to caving, and low resource recovery rate. How to improve the caving performance of top coal is a long-term research subject. [0003]...

Claims

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Application Information

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IPC IPC(8): E21C41/18
Inventor 王保玉田永东张双斌郭红玉夏大平张典坤季长江徐斌
Owner 山西蓝焰煤层气集团有限责任公司
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