Underground goaf filling material and preparation method and application thereof

A filling material and goaf technology, which is applied in the field of underground goaf filling materials and their preparation, can solve the problems of filling underground goafs, outstanding safety hazards, and no filling materials, etc., so as to ensure safe mining and eliminate safety hidden dangers and the effect of reducing cement consumption

Pending Publication Date: 2021-05-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, mine tailings are usually used as filling materials for underground goafs in the field of mine mining, but some mine tailings contain toxic substances, such as arsenic, cyanide and other toxic substances in gold mine tailings. Hazardous waste is not allowed to be used to prepare filling materials to fill underground mined-out areas
Therefore, a large number of underground goafs are left behind after mining in such mines, which poses serious safety hazards.

Method used

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  • Underground goaf filling material and preparation method and application thereof
  • Underground goaf filling material and preparation method and application thereof
  • Underground goaf filling material and preparation method and application thereof

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preparation example Construction

[0029] The present invention provides the preparation method of underground goaf filling material described in the above technical solution, comprising the following steps:

[0030] The fly ash, desulfurized gypsum, ordinary portland cement and water are fully stirred to obtain the underground gob filling material.

[0031] In the present invention, the fly ash, desulfurized gypsum and ordinary Portland cement are preferably first stirred and mixed to obtain a mixed dry material; then the mixed dry material is mixed with water for a second time to obtain an underground goaf filling material. In the present invention, the time for the first stirring and mixing and the second stirring and mixing is preferably independently 2-5 minutes. The present invention adopts the above-mentioned mixing method, which is beneficial to ensure uniform mixing and dispersion of each component. In the present invention, there is no special limitation on the stirring rate during the mixing process...

Embodiment 1～3

[0037] Stir and dry fly ash, desulfurized gypsum and ordinary Portland cement P.O.42.5R for 3 minutes to obtain a mixed dry material; stir and mix the mixed dry material with water to obtain an underground goaf filling material; wherein, the powder The main chemical components of coal ash, desulfurized gypsum and ordinary Portland cement P.O.42.5R are shown in Table 1, and the particle size distribution and specific surface area of ​​the fly ash and desulfurized gypsum are shown in Table 2. The dosage of each component in the zone filling material is shown in Table 3.

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Abstract

The invention provides an underground goaf filling material and a preparation method and application thereof, and belongs to the technical field of goaf filling. The underground goaf filling material provided by the invention is prepared from raw materials including fly ash, desulfurized gypsum, cement and water, the mass ratio of the fly ash to the desulfurized gypsum to the cement is (2-6):(2-6):1, and the total mass of the fly ash, the desulfurized gypsum and the cement accounts for 55-75% of the mass of the goaf filling material. The underground goaf filling material is prepared from the two industrial solid wastes, namely the fly ash and the desulfurized gypsum, matched with the cement and the water, so that the strength required by underground mining filling bodies can be met, potential safety hazards of underground goaf are eliminated, safe mining of mines is guaranteed, meanwhile, recycling treatment of the industrial solid wastes can be realized, the cement consumption is reduced, and economic benefits and social benefits of mine enterprises are improved.

Description

technical field [0001] The invention relates to the technical field of goaf filling, in particular to an underground goaf filling material and a preparation method and application thereof. Background technique [0002] The underground mined-out area refers to the hollow area left after the mining of underground minerals. The existence of the underground mined-out area is an important problem restricting the development of mines. As the mine goes deep, the ground pressure increases, and the underground mined-out area is Under strong ground pressure, collapse accidents are prone to occur; a large number of goafs and roadways left by underground mining have not been dealt with in time, which poses a serious threat to mine staff and equipment. Therefore, the existence of underground mined-out areas will directly affect the safe production of mines. [0003] Filling mining technology is an effective means to control underground goafs. It mainly uses materials with a certain stre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/144C04B2111/00017C04B2111/00724C04B2201/50C04B18/08C04B7/02
Inventor 曹帅黄智强李佳建郑迪宋卫东薛改利
Owner UNIV OF SCI & TECH BEIJING
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