Study on Proportioning Test of Coal Solid Waste Paste Filling Material

Abstract

In order to excavate coal resourses which is under buildings, water bodies, railways and above confined water, a complete technology of new pumping paste comprehensive mechanization mining technique which is safety, high efficiency, high mining rate and environmental protection has been formed, the study on filling material is very important. In this thesis, the uniform experiment is used comprehensively on the proportioning test of mine solid waste such as coal gangue, fly ash etc. The results showed: (1) the collapsed slump of paste will increase obviously with the increase of the content of fly ash; (2) the paste stratified degree will decrease regularly with the increase of the content of fly ash; (3) the paste bleeding rate will reduce obviously with the increase of the content of fly ash; (4) the paste strength will increase gradually with the the increase of cementing material; (5) early strength agent can improve the early strength of filling test blocks to some extent, but the later strength growth is not obvious.

Study on the effect of multi-source solid waste on the performance of its backfill slurry

“…The key to realizing large-scale underground backfilling of solid waste slurry is the fluidity and early strength of the backfill material. The fluidity affects the transportation and backfilling efficiency of the backfill slurry, while early strength affects the rock stratum control effect after backfilling [ [7] , [8] , [9] , [10] ]. Many scholars have done a lot of research work on the physical and mechanical properties of mine backfilling materials.…”

Fluidity Influencing Factor Analysis and Ratio Optimization of New Filling Slurry Based on the Response Surface Method

“…Accordingly, experts and scholars have conducted substantial research on filling mining materials. In terms of utilization of solid waste: Zhang et al [10,11] used the uniform test method to carry out the proportioning test of coal gangue, fly ash, and other mine solid wastes and examined the optimal proportioning and hydration reaction mechanism of paste filling materials. Yang et al [12] studied the influence of slurry concentration and suspending agent on the performance of coal gangue-fly ash cemented filling material through the response surface method and established the prediction model of slump, segregation rate, and bleeding rate of coal gangue-fly ash slurry.…”