Method for preparing coal mine residual mining area filling paste from red mud

Abstract

The invention discloses a method for preparing coal mine residual mining area filling paste from red mud. The method includes the steps that on the basis of testing the water content, particle diameter, permeability coefficient and expansion coefficient of the red mud, superfine powder for preparing the coal mine residual mining area filling paste is obtained through ball milling, coal gangue is broken and screened, and crude aggregate and fine aggregate for preparing the coal mine residual mining area filling paste are obtained; finally, the superfine powder solution is neutralized and matched with water, a water reducer, an early strength agent, an expanding agent and a retarder, the materials are mixed to be uniform, and the coal mine residual mining area filling paste is prepared. The problem that the source range of residual mining area paste filling materials is narrow is solved, occurrence of dynamic disasters of a residual mining area can be scientifically prevented and controlled, sustainable development is guaranteed, the widely-accumulated red mud is reasonably and efficiently utilized, and the pollution hazard to the surrounding is relieved.

Description

technical field [0001] The invention relates to the technical field of coal mine cemented filling materials, in particular to a method for preparing filling paste in coal mine residual mining area by using red mud, which is mainly applicable to the treatment of underground residual mining area of ​​coal mine. Background technique [0002] Affected by the private excavation and excessive mining of small coal mines in the early stage, the occurrence area of ​​underground residual mining areas in my country has increased year by year. The widespread distribution of underground residual mining areas can easily lead to disasters such as surface cracking and subsidence, spontaneous combustion of abandoned coal resources, and leakage of toxic gases, which will seriously affect the stability of surface buildings, water bodies, and railways. At the same time, the remaining coal pillars in the underground residual mining area are criss-crossed, and under the coupling effect of long-te...

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a method of using red mud to prepare filling paste in the residual mining area of ​​coal mines, which not only solves the problem that the source range of paste filling materials in the residual mining area is small, but also scientifically prevents and controls the occurrence of dynamic disasters in the residual mining area , ensure sustainable development, and make reasonable and efficient use of extensive accumulation of red mud, reducing pollution hazards to the surrounding environment