Coal mine cemented filling material and filling method thereof

Abstract

The invention discloses a coal mine cemented filling material prepared from the major raw material loess and a filling method thereof, and relates to the technical field of coal mine cemented filling. The coal mine cemented filling material is prepared from water and a solid material; the mass concentration of the solid material is 50-65%, and the solid material comprises 30-40 parts by weight of loess, 10-20 parts by weight of coal ash and 5-10 parts by weight of cementing agent. The coal ash is fed into a waste homogenizing table for homogenizing; the loess is conveyed to a sieving machine and sieved by use of a vibrating sieve; the cementing agent, the coal ash and the loess are conveyed to a primary mixing tank by use of a screw feeder and added with water for mixing; the slurry is discharged into a secondary intensified mixing tank and mixed thoroughly; the mixed slurry is conveyed to the bottom of a well. The cemented filling material is low in cost and superior in conveying property; the filling medium is wide in source and easily available.

Description

technical field [0001] The invention relates to the technical field of coal mine cemented filling, in particular to a coal mine cemented filling material and a filling method with loess as the main raw material. Background technique [0002] At present, coal mine cemented filling mainly includes paste filling mining and paste-like filling mining. The pulping and conveying systems are relatively complicated, the cost is high, and the initial strength and conveying capacity are greatly restricted. Especially when the concentration is high, it is very difficult to add a coagulant, resulting in a long working cycle, which is not conducive to the efficient implementation of filling mining. [0003] The premise of loess direct filling is too much investment, and a special conveying system is required. After direct filling, the filling body has a high compression rate and the filling effect cannot be guaranteed. Therefore, the loess cemented filling process is studied for Shanxi, S...

AI Technical Summary

Problems solved by technology

[0002] At present, coal mine cemented filling mainly includes paste filling mining and paste-like filling mining. The pulping and conveying systems are relatively complicated, the cost is high, and the initial strength and conveying capacity are greatly restricted.

Especially when the concentration is high, it is very difficult to add a coagulant, resulting in a long working cycle, which is not conducive to the efficient implementation of filling mining

[0003] The premise of loess direct filling is too large, and a special conveying system is required. After direct filling, the filling body has a high compression rate, and the filling effect cannot be guaranteed. Therefore, for Shanxi, Shaanxi and other places, the loess cemented filling process is studied.