Filling process for recovering coal pillars by filling goaf with paste

A paste filling and goaf technology, which is applied in the fields of filling, mining equipment, earthwork drilling, etc., can solve the problems of shallow burial and waste of coal resources, and achieve the effect of low cost and optimized technical index value.

Inactive Publication Date: 2011-05-18
TIANDI SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the shallow burial, mining coal seams must avoid affecting the surface, so it is often necessary to leave larger and denser coal pillars, but this often results in a huge waste of coal resources

Method used

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  • Filling process for recovering coal pillars by filling goaf with paste
  • Filling process for recovering coal pillars by filling goaf with paste
  • Filling process for recovering coal pillars by filling goaf with paste

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Embodiment Construction

[0062] Below in conjunction with embodiment further illustrate.

[0063] The weight ratio of each component of the paste material used in this embodiment is: aeolian sand: 67%, fly ash: 12.8%, cement: 3.2%, additive: 0.5%, water: 16.5%.

[0064] figure 1 The composition structure and flow diagram of each part of the present invention are given.

[0065] The aeolian sand is transported from the sand field 1 to the filling station through the loader, and stored in the aeolian sand silo 4 through the hoist 3, and the fly ash is stored in the fly ash silo 5, and the cement is stored in the cement silo 6. The additives are stored in the additive silo 7, and the building pool 10 is used to store water. After confirming the start of filling, the weight of the paste main material and auxiliary materials is determined according to the ratio through the computer batching system, and the main paste materials and auxiliary materials are transported to the mixer 11 by each silo through t...

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Abstract

The invention provides a filling process for recovering coal pillars by filling a goaf with paste. The filling process comprises three parts: preparing filling paste; conveying the paste via a pipe; and filling the goaf with the paste. The adopted filling paste comprises the following raw materials in percentage by weight: 40%-70% of aeolian sand, 10%-25% of coal ash, 3%-10% of cementing materials, 0.4%-1% of additive and 10%-30% of water. In the filling process, the goaf filling part comprises the procedures of primary filling and secondary filling, wherein, the coal pillars are recovered after primary filling; the whole goaf is fully filled after secondary filling; and roof-contacted supplementary filling is carried out in each filling procedure. The filling process has the advantages that the problems of filling the goaf formed after pillar-support mining and recovering the coal pillars are solved, the mining area environment can be protected more effectively, the increasingly exhausted coal resources are saved, and the filling cost is lowered.

Description

technical field [0001] The invention relates to a filling process, in particular to a filling process using paste to fill the recovered coal pillars in goafs. Background technique [0002] The use of paste to fill the goaf was first developed from foreign metal mines, and the main materials of the paste are river sand and gangue. In 1994, China built the first paste pumping and filling system in the No. 2 mining area of ​​Jinchuan Nonferrous Metals Corporation, and began to use paste to fill mines. In May 2006, the first paste filling system in my country's coal mine was successfully applied in Taiping Coal Mine. After that, Suncun Coal Mine, Xiaotun Coal Mine, Zhucun Coal Mine, and Daizhuang Coal Mine also built paste filling systems one after another, using paste filling for gobs. But at present, all goaf fillings are just to prevent surface subsidence. For coal mining, it is aimed at the goaf formed by longwall working face mining. However, there is no precedent for th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F15/00E21F15/06
Inventor 张华兴刘鹏亮崔锋胡炳南郭爱国
Owner TIANDI SCI & TECH CO LTD
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