Novel expansion filling material and preparation method thereof

Abstract

The invention relates to a novel expansion filling material and a preparation method thereof, and the novel expansion filling material comprises the following main components: a cementing material, mine tailings, an expanding agent and a stabilizer, the novel expansion filling material comprises the following components in percentage by mass: 6.71%-13.65% of slag 325 # cement, 50.09%-54.58% of mine tailings, 26.84%-33.42% of filling water, 6.38%-9.64% of an expanding agent and 2.16%-3.25% of a stabilizer which is preferably methyl cellulose ether, the cementing material is preferably selected from one or more of ordinary Portland cement, Portland slag cement, Portland pozzolana cement, Portland fly ash cement and composite Portland cement. Compared with the prior art, the novel expansion filling material and the preparation method have the beneficial effects that the strength change of the novel expansion filling material is small, the phenomenon of volume instability is avoided after long-term filling, and the novel expansion filling material is used for filling a goaf with the same volume and needs less cementing materials, so that the filling cost is reduced.

Description

technical field [0001] The invention relates to the technical field of mining engineering, in particular to a novel expansion filling material and a preparation method. Background technique [0002] The filling mining method refers to the mining method that gradually fills the goaf with filling materials as the mining face advances during the mining process to achieve ground pressure management, control surrounding rock collapse and surface movement. Waste-free mining is the development of mining. It is an inevitable trend. With the continuous consumption of the existing proven mineral resources, mining is gradually developing towards the deep. Considering the influence of factors such as ground temperature, ground pressure, and rockburst, the application range of filling mining methods in my country will continue to expand. The mining method uses artificially formed filling bodies to manage ground pressure, control surrounding rock collapse and prevent surface subsidence, whi...

AI Technical Summary

Problems solved by technology

[0002] The filling mining method refers to the mining method that gradually fills the goaf with filling materials as the mining face advances during the mining process to achieve ground pressure management, control surrounding rock collapse and surface movement. Waste-free mining is the development of mining. It is an inevitable trend. With the continuous consumption of the existing proven mineral resources, mining is gradually developing towards the deep. Considering the influence of factors such as ground temperature, ground pressure, and rockburst, the application range of filling mining methods in my country will continue to expand. The mining method uses artificially formed filling bodies to manage ground pressure, control surrounding rock collapse and prevent surface subsidence, which can alleviate many problems faced by underground mining. There is a subsidence phenomenon, which leads to the phenomenon that the filling is not connected to the roof, causing a large area of ​​the roof to hang in the air, making it difficult to guarantee the safety of the mining operation, which brings hidden dangers to the safe production of the mine. Therefore, in the filling method, the filling and roof connection is an important The quality of filling and roofing is largely related to the success or failure of this mining method. Various measures should be adopted to ensure filling and roofing and increase the rate of roofing as much as possible.

[0003] At present, according to the specific conditions of the mine, there are mainly technical measures such as manual roofing, forced roofing, selection of appropriate slurry concentration, improvement of filling process, pressurized pumping of filling material, and change of the shape of the empty roof when implementing roofing and roofing according to the specific conditions of the mine. The above measures are all passive roofing, and there are problems such as complicated process, heavy labor workload, high filling cost, and the rate of roofing cannot reach the expected effect.