Method for backfilling land collapse pit of mine subjected to caving mining by utilizing tailings

Abstract

The invention provides a method for backfilling a land collapse pit of a mine subjected to caving mining by utilizing tailings. The method comprises the steps that (1) a collapse pit mill tailing backfill material is prepared, specifically, binding materials and mill tailings are mixed and stirred at the proportion of (1:6)-(1:8), and the concentration of backfill slurry can reach over 65%; (2) backfill zoning is conducted on the mine land collapse pit; (3) a solidified tailing slurry single-point piling and discharging flowing average expansion radius is determined, specifically, the solidified tailing slurry single-point piling and discharging flowing average expansion radius is determined to be 20 m; and (4) backfill material solidifying is conducted, specifically, tailing solidifying and backfilling units are arranged along the boundary arc length of a piled and discharged position of a semi-secure area at intervals of 20 m when on-site piling and discharging are conducted, the prepared backfill material is directly discharged into the designated backfilling units, the one-time piled and discharged thickness is (4.59-4.59 m)-9.78 m, the solidifying time lasts for 14 days, and circulation backfilling is conducted. According to the method, potential safety hazards of a tailing pond can be avoided, a lot of lands can be saved, meanwhile the problem of safety of a land collapsearea is solved, and the engineering amount and the cost of mine terminal-stage management of geological disasters are greatly reduced.

Description

Technical field: [0001] The invention relates to a method for backfilling surface subsidence pits using tailings in caving mines, and belongs to the technical field of mine tailings utilization. Background technique: [0002] Tailings are "waste" discharged by mining enterprises under certain technical and economic conditions. By the end of 2015, the tailings stockpile in my country had reached 14.6 billion tons, and the number of tailings ponds nationwide had reached more than 12,600. The stockpiles cover an area of ​​18,700 to 24,700 km2. At present, most mining enterprises adopt the method of wet direct discharge to deal with tailings. The tailings naturally precipitate, and the dehydration efficiency is very low. A large amount of clarified water and floods are often stored in the tailings reservoir area, resulting in the formation of hanging lakes above the tailings. A source of danger and environmental risk with high potential energy and high hazard has been formed. T...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for backfilling mine tailings surface subsidence pits in caving mines in view of the above existing problems, which can not only solve the potential safety hazards of tailings ponds, save a lot of land, but also solve the safety problems of surface subsidence areas, Greatly reduced the amount and cost of geological disaster management at the end of the mine

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