Coarse-fraction tailing paste filling method and system

Abstract

The invention discloses a coarse-fraction tailing paste filling method and system. The coarse-fraction tailing paste filling method comprises the following steps that (1) coarse-fraction tailing mortar is conveyed to a linear vibrating screen to be screened to obtain coarse sand and low-concentration tailing slurry; (2) the low-concentration tailing slurry is pumped into a deep-cone thickener, a flocculating agent is added, and high-concentration tailing slurry is formed in a base flow; (3) when a sand setting layer in the deep-cone thickener is away from the highest point of the deep-cone thickener by 2 m, the low-concentration tailing slurry is pumped into a tailing pond; (4) the high-concentration tailing slurry is pumped into a sand silo for buffer storage; (5) during filling, the high-concentration tailing slurry, with the concentration reaching the standard, in the step (2) and the high-concentration tailing slurry, with the concentration reaching the standard, in the sand silo in the step (3) are both pumped into a stirring system; cement and water are conveyed into a first-section horizontal-type stirring machine to be sufficiently stirred and mixed with the high-concentration tailing slurry, and filling slurry is obtained; and according to the magnitude of a stowing gradient, the filling slurry automatically flows or is pumped into a down-hole goaf to conducting filling. Operation is reliable, the cost is low, and abrasion is small.

Description

technical field [0001] The invention relates to the technical field of paste filling, in particular to a filling method and a filling system for coarse-grained tailings paste. Background technique [0002] Due to the different ore properties and beneficiation processes of different mines, the properties of tailings after beneficiation are also very different, and the different properties of tailings have great differences in the choice of filling process. In particular, there are many problems in the application of coarse-grained tailings (generally referring to tailings with -200 mesh less than or equal to 30% or average particle size greater than or equal to 300 microns) in the filling process: [0003] (1) The application of coarse-grained tailings in the filling process is usually as follows: the coarse-grained tailings slurry is directly pumped to the vertical sand bin (or grit chamber), and the traditional vertical sand Concentration and dehydration in bins or grit ch...

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Problems solved by technology

[0003] (1) The application of coarse-grained tailings in the filling process is usually as follows: the coarse-grained tailings slurry is directly pumped to the vertical sand bin (or grit chamber), and the traditional vertical sand Concentration and dehydration in bins or grit chambers, because the tailings are too thick, it will cause the thickening machine to press the rake, and the density of the underflow slurry is too high, so the tailings slurry cannot be released, so the traditional sand bins can concentrate, dehydrate and store the tailings The efficiency is often low, and the overflow water in the sand bin is turbid. Before the sand bin is formally filled with sand, it often needs to go through the processes of tailings settlement, drainage, and slurry making, and the process is relatively complicated.

[0004] (2) Another application of coarse sand in the filling process is to pump the coarse sand to the tailings pond for natural dehydration, then take the sand from the tailings pond to the filling station, and use the filling technology of the concrete mixing station type. However, this kind of filling technology often needs to transport the tailings to the filling station by car, so the filling cost is relatively high. On the other hand, this kind of filling process often has a small filling capacity, and it is difficult to adapt to large-scale Mining needs for backfill

However, when the tailings are very thick, and the largest tailings in some mines are even ≥10mm, and because the impeller speed of the mixer in the second stage of the mixer is very fast (300 to 900r / min), the wear of the blades of the high-speed activation mixer will be very large. Equipment maintenance costs are high

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