A method for storing acidic waste rocks in open pit mines

Abstract

The invention discloses a method for stockpiling acidic waste rocks in an open-pit mine, which comprises the following steps: S1, laying a cushion layer on the ground surface, and performing compaction treatment on the cushion layer; The transition layer of sulfur-containing waste rock, the protective layer to prevent the acid water produced by sulfur-containing waste rock from penetrating into the ground, the low-sulfur-containing waste rock layer and the high-sulfur waste rock layer, so that the transition layer, protective layer, low-sulfur waste rock layer and the high-sulfur waste rock layer are wrapped from outside to inside; S3, the part of the transition layer exposed to the air is completely covered with a sulfur-free waste rock layer; the outermost sulfur-free waste rock layer of the present invention has high hardness, The particle size is large, and gradually inward is a transition layer with a gradually lower particle size, and then inward is a protective layer that directly wraps the sulfur-containing waste rock layer. The protective layer has low permeability and prevents the sulfur-containing waste rock layer from contacting with air and precipitation, thereby Prevent sulfur-containing waste rocks from being oxidized by air and soaked in rainwater to produce acid water, and the layer-by-layer protection realizes the sealing of sulfur-containing waste rocks without dead ends.

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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