Coal mine goaf filling material made of gangue

Abstract

The invention discloses a coal mine goaf filling material made of gangue, which comprises the following components according to parts by weight: 15 parts of gangue, 4 parts of coal ash and 0.6 parts of cement. The potential gel performance of the gangue is reasonably utilized, the gangue is filled to an underground goaf to furthest improve the use ratio, and the ground surface stockpiling amount is reduced. In the mine gluing and filling operation, the coal ash is utilized to replace parts of cement so as to reduce the mine filling cost and lower the production cost.

Description

technical field [0001] The invention relates to the field of treatment of goafs in coal mines, in particular to a filling material for goafs in coal mines made by using coal mine waste---coal gangue as the main raw material. Background technique [0002] my country is one of the few countries in the world whose primary energy is dominated by coal. As a basic energy source, coal plays a decisive role in the development of the national economy and human progress. But at the same time, the harm caused by coal mining to the environment is also increasing day by day, mainly including ground subsidence caused by coal mining, coal mining wastewater, coal gangue and damage to the ecology of the mining area. It can cause damage to villages, pipelines, bridges and railways, and the subsidence of farmland will cause large areas of water accumulation and land salinization, making it impossible to cultivate. The main reason for ground subsidence is that the coal mine goaf has not underg...

AI Technical Summary

Problems solved by technology

This kind of filling has the disadvantages of large labor demand, high operation cost, long stope filling time, affecting production, etc., and the filling effect is not ideal