In some underground mining operations, a cemented paste is used to fill the chambers where the ore was already mined, in this article we will briefly review how this process take place.
First it starts with the make of the paste, this paste has as main component the tailings that came from the thickening circuit, and contains an average of 50 to 70 percent solids.
The tailing goes through a second stage of solid/liquid separation, where it passes through filter discs that use filter cloths and pumps that generate a vacuum, taking the material to a concentrations up to 80 percent of solids, that at this point takes the name of cake.
The product obtained from the filtration is mixed with cement to form the paste that is stored in hoppers, to be transported by means of pipes to the interior of the mine where it will be used to fill the pit, usually in the upper levels.
It should also be mentioned that this paste must go through a series of tests, as particle size and resistance to ensure his reliability.
The application of filler paste first complement is grant stability to the upper levels to give continuity to the mining of the lower levels.
Regarding the environmental impact, the reuse of the tailings stand out, decreasing their deposition in the tailings dam, as they can return up to 50 percent of the extracted material, and water recovery, which is then reused on the process, and in the paste plant.
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