High-early-strength filling material for coal mine goaf

Abstract

The invention relates to a high-early-strength filling material for a coal mine goaf. The high-early-strength filling material is prepared from the following components in parts by weight: 10-20 parts of quick-hardening sulphate aluminate cement, 40-80 parts of coal ash, 150-200 parts of coal gangue particles, 1-3 parts of a content-available superplasticizer and 0.1-1 part of a thickener. The high-early-strength filling material is used for filling the coal mine goaf and is remotely pumped, and is high in strength increase speed and filling efficiency, low in filling cost, safe and environmentally friendly. An experiment shows that the early strength of the high-early-strength filling material is high and can reach 10.0MPa, and the compressive strength can reach 18.0MPa in the 28th day.

Description

technical field [0001] The invention relates to a coal mine goaf filling material, in particular to an early-strength type coal mine goaf filling material. Background technique [0002] Coal resources have always been my country's largest energy source, accounting for about 70% of my country's energy consumption, and in the next few decades, my country's coal-based energy structure will not change significantly. Currently. After the coal is mined by the traditional coal mining process, the goaf is not backfilled. In this way, the rock stratum overlying the mining space loses support and gradually moves, bends and destroys into the goaf, which causes land subsidence disasters. The damage caused by the subsidence has involved various aspects such as industry, agriculture, transportation, environmental protection, and ecological balance. [0003] In recent years, as people's understanding of environmental issues has gradually deepened, the governance of coal mine goaf subside...

AI Technical Summary

Problems solved by technology

At present, the traditional domestic governance model is mainly to control the coal mining subsidence after it has stabilized, that is, coal mining subsidence-compensation for losses-collapse land idle-treatment, which not only brings great difficulties to the treatment project, but also high treatment costs. cause a heavy economic burden

In response to the above problems, the main solution for the coal industry is to backfill the goaf during the coal mining process, that is, to use the method of backfilling while mining, and the backfill materials used are mostly activators, activating powder, coal, etc. Ash active materials, this technology route has problems such as slow development of filling material strength, unstable activator performance, low final strength, easy pulverization of consolidated matter, and low filling efficiency in the actual application process.