Method for backfilling land collapse pit of mine subjected to caving mining by utilizing tailings
A technology of surface subsidence and caving method, which is applied in the field of mining tailings utilization, to achieve significant direct economic benefits, save treatment costs, and eliminate geological disasters
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[0046] A method for backfilling a collapsed pit on the surface of a tailings mine in a caving method includes:
[0047] (1) Preparation of backfill from collapsed pit tailings
[0048] According to the fluidity characteristics of the overlying rock in the collapse pit, fine-grained debris should not be generated after the tailings are backfilled to the collapse pit. Tailings classification and self-made cementitious materials are required according to the characteristics of the tailings. The cementitious materials consist of 17.5% activator and 82.5% % Water quenching slag, in which the activator includes 21.3% gypsum, 19.4% water glass and 59.3% cement clinker, and then the cementing material and tailings are mixed in a ratio of 1:6 to 1:8 Stir to make the concentration of the backfill slurry reach more than 65%, so that it is not easy to enter the underground working surface through the cracks in the overburden when it is just backfilled into the collapse pit.
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