Preparation method of environment-friendly gelling material for mine pit filling

Abstract

The invention relates to a preparation method of an environment-friendly gelling material for mine pit filling. Fly ash, colored ore slag powder, red mud, cement, quick lime, gypsum powder and vesuvianite powder are mixed and are subjected to ball grinding into blank powder; the blank powder is subjected to calcination and ball grinding to obtain mixed powder; the mixed powder, sodium silicate andfoaming agents are mixed and stirred uniformly; the environment-friendly gelling material for mine pit filling is prepared. The prepared gelling material consumes a large number of solid wastes; theenergy is saved; the environment is protected; the technical defects of poor conveying, separation, draining, water discharging and filling body early-period compressive strength are overcome; the water content is high; the slurry is not separated; the dehydration is not needed; the pumpability is high; the slurry concentration can be changed in a range being 30 percent to 70 percent; after filling for 2h, the compressive strength can reach 3.3MPa; after 24h, the compressive strength can reach 5.9MPa; the final compressive strength can reach 11.9MPa.

Description

Technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of an environment-friendly cementitious material for pit filling. Background technique [0002] With the development of industrial economy and urban construction, various mineral resources are indispensable. The large number of mines, tunnels and goafs left by mining will also cause serious geological disasters and environmental pollution over time, such as landslides, cracks, surface subsidence, water loss, damage to cultivated land, forests, houses, groundwater pollution, and Hazards to humans and animals, etc. [0003] The current method used to repair mines is usually to mix cement and mining waste slag. The biggest problem with cement as a cementing material for mine filling is large segregation and bleeding. Mine filling generally adopts ground-mixing pulping and pipeline self-flow transportation technology, that is, the use of vertical pipeline p...

AI Technical Summary

Problems solved by technology

Therefore, cement has the following defects as the cementitious material of mine pits: 1), excess water must be discharged quickly, so as not to affect the solidification and later filling, so it is generally required to use desliming and grading tailings with good drainage effect to fill; 2), water is discharged when flowing The process will cause segregation and stratification of the slurry, which will greatly reduce the solidification strength of the filling body. In order to reduce segregation and drainage, it is necessary to increase the concentration of the slurry, but this increases the difficulty of transportation, and even cannot be transported by gravity