Stock-piling method for acidic waste rocks of open pit mine

Abstract

The invention discloses a stock-piling method for acidic waste rocks of an open pit mine. The stock-piling method comprises the following steps: S1, spreading a cushion layer on an earth surface, andcompacting the cushion layer; S2, piling a transition layer for sealing sulfur-containing waste rocks, a protective layer for preventing acidic water generated by the sulfur-containing waste rocks from permeating to the underground, a low-sulfur-content waste rock layer and a high-sulfur-content waste rock layer on the cushion layer from outside to inside, and packaging the transition layer, the protective layer, the low-sulfur-content waste rock layer and the high-sulfur-content waste rock layer one by one from outside to inside; S3, completely covering the part, exposed into air, of the transition layer with the waste rock layer without sulfur. The waste rock layer without sulfur of the outermost layer is high in hardness, is great in particle size, then, the layer is a transition layerwith gradually reduced particle size, and finally the layer is the protective layer for directly packaging the sulfur-containing waste rock layer; and the protective layer is low in permeability, andthe sulfur-containing waste rock layer is prevented from being in contact with air and rainfall, so that the sulfur-containing waste rocks are prevented from generating acidic water after being oxidized through air and leached with rain; and layer-by-layer protection achieves no-dead-corner sealing for sulfur-containing waste rocks.

Description

technical field [0001] The invention relates to the field of mining, in particular to a method for stockpiling acidic waste rocks in open-pit mines. Background technique [0002] Open-pit mining is to strip off the floating soil and surrounding rock covering the upper part of the ore body and its surroundings, transport the waste rock to the dump site, and directly mine ore from the open ore body, which is gradually formed in the process of infrastructure construction and production. . [0003] The stripping of sulfide ore open-pit mines produces a large amount of waste rock, most of which are non-sulfur-containing waste rocks, and some are sulfur-containing waste rocks. The sulfur-containing waste rocks are divided into high-sulfur-containing waste rocks and low-sulfur-containing waste rocks. Among them, under the action of long-term natural oxidation and rainwater leaching, high-sulfur waste rocks are prone to produce acidic water with low pH and high content of heavy met...

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Problems solved by technology

Among them, under the action of long-term natural oxidation and rainwater leaching, high-sulfur waste rocks are prone to produce acidic water with low pH and high content of heavy metal ions. The acidic water produced by high-sulfur waste rocks will induce low-sulfur waste rocks. Potentially acidic, low-sulfur waste rock produces a large amount of acidic water in a short period of time, and acidic water is difficult to treat, so it needs to be solved urgently

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