Aeolian sand paste-like filling material for coal mine

Abstract

The invention relates to the field of working face goaf filling and gob-side entry retaining, in particular to an aeolian sand paste-like filling material for coal mines. The filling material comprises a solid material and water; the mass concentration of the solid material in the filling material is 66%-75%; filling slurry can automatically flow, without the need of pump pressure; the solid material comprises the following components by weight: 36-40 percent of pulverized fuel ash, 4-8 percent of auxiliary materials and 48-56 percent of aeolian sand. The size grading of the aeolian sand adopted in the filling material is poor, the aeolian sand comprises main components of SiO2 and Al2O3, and with the increase of the mixing amount of the aeolian sand, the performance density of the filling body is increased by 23.4%, and the material cost is lowered by 25.6%; with the increase of the auxiliary materials, the 28 d strength of the filling body is increased by 59.4%, the stone rate is increased to 109.5, and is increased by 23%, and the filling body is in slight expansion state.

Description

technical field [0001] The invention relates to the fields that can be used for gob filling and gob-side entry retaining in working faces, and in particular relates to an aeolian sand-like paste coal mine filling material. Background technique [0002] The Ordos and Yulin areas in Shaanxi and Mongolia in Northwest my country are rich in coal resources and are the main high-quality energy sources in the 21st century, with huge development potential and broad development prospects. At the same time, because it is located in the connecting zone between the Mu Us Desert and the Loess Plateau, water resources are scarce, the land is barren, the vegetation conditions are poor, the ecological system in the region has poor self-regulation ability, and it is an area with a fragile ecological environment. Due to the large-scale mining of coal resources, the damage to the ecological environment and ground buildings in mining areas has become more and more serious, which has become an i...

AI Technical Summary

Problems solved by technology

At the same time, because it is located in the connecting zone between the Mu Us Desert and the Loess Plateau, water resources are scarce, the land is barren, the vegetation conditions are poor, the ecological system in the region has poor self-regulation ability, and it is an area with a fragile ecological environment.

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