Composite stable layer structure at bottom of heavy metal tailing pond and construction method

Abstract

The invention belongs to the technical field of seepage prevention and stabilization of heavy metal tailings ponds, and particularly relates to a composite stable layer structure at the bottom of a heavy metal tailings pond and a construction method thereof. The composite stable layer structure sequentially comprises a self-cementing layer, a percolate guide and discharge layer and an inverted filter protection layer from bottom to top. The self-cementing layer is mainly prepared from the materials of a self-cementing material, superfine tailing sand, flexible fibers and the like. The percolate guide and discharge layer takes coarse particle ore sand formed by natural or mechanical separation and deposition as a matrix, water collecting blind ditches are arranged at certain intervals in the direction perpendicular to the axis of a dam, and the blind ditches are divided into an upper layer and a lower layer and are correspondingly filled with medium-particle-size and large-particle-sizeriver sand; meanwhile, slotted hole seepage discharge pipes are buried in the lower layer, and the end parts of the slotted hole seepage discharge pipes penetrate out of a tailing dam body; and the inverted filter protection layer is coarse particle ore sand formed by natural or mechanical separation and deposition. The material and thickness of each layer structure are matched with each other, and the composite stable layer structure at the bottom of the heavy metal tailings pond has the advantages of being good in anti-seepage effect, high in strength and toughness, capable of solidifying/stabilizing heavy metal to a certain extent, good in anti-clogging and guiding and discharging effect, high in economical efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of anti-seepage and stabilization of heavy metal tailings ponds, and in particular relates to a composite stable layer structure and construction method at the bottom of heavy metal tailings ponds. Background technique [0002] Heavy metal minerals, such as lead, zinc, copper, antimony, tin, tungsten, etc., are important resources for my country's industrial production and play an important role in my country's social and economic development. In the development of heavy metal mineral resources, a large amount of tailings sand is produced due to the use of beneficiation processes such as flotation. At present, the discharge of heavy metal tailings in my country is mainly the wet discharge method, that is, it is pumped through pipelines in the form of slurry and discharged into the storage yard for natural sorting, deposition and storage. The solution in the wet tailings sand is strongly acidic or alkaline, ...

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Problems solved by technology

The drainage of leachate usually uses artificial composite drainage network or natural sand, pebbles, geotextiles, etc. to form a graded layer, and drains through ordinary drainage pipes. There is a problem of silting and failure in the later drainage process.

[0004] It can be seen that the main materials used in the stable layer of the heavy metal tailings pond cannot be well obtained locally, and the cost is relatively high, especially the application of HDEP film, which greatly increases the cost and causes a great economic burden to the enterprise; the traditional The technical structure of the stabilization layer is complicated, the effect of each layer is single (for example, only to achieve anti-seepage or drainage), and the mechanical properties such as strength are limited; at the same time, the problem of solidification / stabilization of heavy metal ions in the leachate discharged and the blockage of the drainage pipe are considered. Less, affecting the safe operation of the tailings pond

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