Cementing materials for filling, slurry and preparing and filling processes

Abstract

A gelatining material similar to cream for filling underground working surface is preapred from the Ca-contained non-crystal and microcrystal material, alkali and / or sulfur contained exciting material, active material, aggregate and regulator. A filling slurry is prepared from said gelatining material, filling aggregate, fine particles, regulator and water through heating to at least 18 deg.C and proportional mixing.

Description

technical field [0001] The invention belongs to the technical field of cemented filling, and relates to filling cementitious materials, preparation of slurry, filling process and application method. Background technique [0002] With the increase of mining depth and the increasingly complex mining conditions, the underground safety issues of resource mining, the improvement of resource recovery rate and the protection of the surface ecological environment have attracted more and more attention from the world. The traditional empty field method or subsidence method Mining can no longer meet the requirements of sustainable exploitation of resources, but the method of filling and filling mining has been greatly developed and widely used. [0003] The filling mining method refers to filling (filling) the cavity formed after underground mining with filling materials as the mining face advances, so as to protect the safety of the underground working space, improve the resource rec...

AI Technical Summary

Problems solved by technology

[0006] (2) Ore bodies with unstable ore and surrounding rocks;

Downhole dehydration inevitably takes away some cement and fine-grained tailings, which not only causes waste of materials, but also seriously pollutes the downhole environment, greatly increasing the cost of downhole drainage and sewage discharge

[0019] (3) The filling body has low strength and poor effect

[0022] (1) The paste filling concentration is high, the slurry preparation process is complicated, and the quality is difficult to control

The weight concentration of paste filling is generally above 80%, which is close to the limit concentration, and there is little room for adjustment. Once a problem occurs in a certain link, it is difficult to guarantee the quality of the slurry

[0023] (2) Paste slurry transportation is very difficult

During the transportation process, the slurry wears and damages the transportation pipeline very seriously, and pipe blockage and pipe breakage often occur, which affects the stability and safety of production.

[0024] (3) Large equipment investment

Due to the high cost of mine filling, so far most of the mine space after mining has not been filled and left to collapse naturally, resulting in ground subsidence, dangerous underground working environment, high resource loss and dilution rate, groundwater pollution, and ground pollution. The construction and ecological environment were seriously damaged and even caused catastrophic damage in some mining areas

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