Foam filling body for coal mine goaf filling and preparation filling method of foam filling body

A goaf and foam technology, applied in applications, household appliances, ceramic products, etc., can solve the problems of increasing the unit price of coal per ton, large amount of cement, etc., and achieve the effect of significant economic benefits, increased consumption, and broad application prospects.

Inactive Publication Date: 2012-10-03
徐州中矿岩土技术股份有限公司
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AI Technical Summary

Problems solved by technology

The amount of cement used in the traditional cement-bonded filling body is large, which increases the cost per ton of coal

Method used

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  • Foam filling body for coal mine goaf filling and preparation filling method of foam filling body
  • Foam filling body for coal mine goaf filling and preparation filling method of foam filling body

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[0023] The method and effect of the present invention will be further described in detail below in conjunction with the accompanying drawings and an embodiment of the present invention, but the present invention is not limited to this embodiment.

[0024] (1) Raw materials and components by weight: 65 parts of fly ash, 35 parts of cement, 45 parts of water, 0.35 parts of water reducing agent, 0.7 parts of coagulation accelerator, 0 parts of active agent, foam: the percentage of gelled slurry volume is 100%.

[0025] The cement is Portland cement with a strength grade of 32.5 or 42.5, and its performance meets the requirements of GB175-1999 "Portland Cement, Ordinary Portland Cement";

[0026] The fly ash is a third-grade fly ash, and its performance meets the requirements of GB / T1596-2005 "Fly Ash Used in Cement and Concrete";

[0027] The water reducer is a polycarboxylate high-performance water reducer;

[0028] The coagulant is sulfate type;

[0029] The foaming agent i...

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Abstract

The invention provides a foam filling body for coal mine goaf filling and a preparation filling method of the foam filling body and belongs to the technical field of coal mine goaf filling and underground construction engineering. The foam filling body comprises the following ingredients in parts by weight: 60 to 70 parts of coal ash, 20 to 40 parts of cement, 20 to 45 parts of water, 0.2 to 0.6 parts of water reducing agents, 0.4 to 1.6 parts of coagulation accelerators and 0 to 20 parts of active agents, and the volume percentage ratio of foam to gelling slurry is 100-250 percent. The gelling slurry solidification time of the filling body is about 3 to 4 days, the single-axis stress intensity is 0.5 to 1.7MPa after 28 days, the apparent density is 650 to 940kg/m<3>, the pumpable time is 11 hours, and the heat conductivity is 0.255 to 0.376 W/(m.k). The foaling filling body can be used for the coal mine goaf filling and has the beneficial effects that the coal ash consumption of the foam filing body is obviously increased, the preparation is simple, the cost is lower, the functions of light weight, cracking resistance, heat insulation, seismic resistance and the like are realized, the on-site application prospects is wide, and obvious economic benefits are realized.

Description

technical field [0001] The invention relates to a foam filling body and a filling method for filling goafs in coal mines, and is mainly suitable for filling goafs in coal mines, filling in underground engineering and using in anti-seismic layers. Background technique [0002] my country is a large country of coal consumption and production, and long-term coal mining has formed a large area of ​​underground gobs. At present, the most direct and effective method to cure surface subsidence and mining damage is goaf backfilling. For a long time, the main technologies used at home and abroad include three methods: dry filling, water-sand filling and cemented filling. Among them, the cemented filling goaf method has high strength after cementation, which can significantly reduce the use of raw materials. It can also be used for medium-thick ore bodies with deep burial, high ground pressure, and unstable surrounding rocks. The use of cemented filling has become a coal mine. The i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B38/08
Inventor 蔡为益丁陈建陶祥令马金荣李志永刘辉刘明王琳张洪乐
Owner 徐州中矿岩土技术股份有限公司
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