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.