Ointment pumping filler material for mine roadway support and preparation

Abstract

The invention discloses a plaster pumping filling material used for supporting mine enby left and a preparation method thereof. At first, natural anhydrite is grinded by an industrial globe mill, the fineness is controlled to be less than 1 percent in the weight of screen residue of 200 meshes, and the specific surface is between 4000 and 5000cm / g; then 0.03 to 0.08 percent of air entraining agent, 0.5 to 1.0 percent of excitant, 1.5 to 2.5 percent of early strength admixture, 0.40 to 1.2 percent of accelerating agent as well as 0.5 to 1.0 percent of water reducing agent are mixed, and then uniformly mixed with 15 to 18 percent of natural anhydrite, 15 to 25 percent of cement, 18 to 25 percent of fly ash, 20 to 25 percent of stones as well as 20 to 25 percent of river sand in a batch mixer to obtain the plaster pumping filling material used for supporting mine enby left. The invention does not need calcining and grinding during production, and can save energies and reduce pollution; moreover, as the dosage of the water reducing agent is reduced, the production cost is reduced, and the market competition is improved, thus greatly promoting the technical development for future mine production; the production technique is simple; mechanical pumping is employed for construction; the invention is simple to be operated and brings more guarantee for the safe production of the mine.

Description

technical field [0001] The invention is mainly applied to the fields of filling and support beside various mine tunnels, and in particular relates to a paste pump filling material with cement, fly ash and gypsum as main cementitious materials and a preparation method thereof. Background technique [0002] Today, when mine safety issues are becoming more and more important, the development of gob-side entry retaining technology requires more and more requirements for roadside support materials. The gob-side retaining keeps the roadway in the low-stress area where the stress redistributes after mining from the spatial perspective, but it cannot avoid the severe effect of the stress redistribution process of the mining support from the time perspective. The roadway needs to withstand the impact of mining twice, and the mine pressure appears Strongly, gob-side entry retaining has the advantages of high coal recovery rate, reasonable connection of mining face, low roadway excavat...

AI Technical Summary

Problems solved by technology

At present, cement is used as the cementitious material for the roadside filling material. The raw materials need to be calcined and ground during production, which brings pollution to the environment, wastes energy and high cost, and is not conducive to market promotion.