Method for phosphogypsum slope sticking

Abstract

The invention discloses a method for phosphogypsum slope sticking. The method includes the following steps that an area to be stuck of a mountain slope is cleaned first, the slope surface of the area to be stuck is trimmed, a layer of clay is uniformly laid in the area to be stuck, compacted and leveled, a lime milk layer is laid on the clay layer, air dried phosphogypsum residues are stacked close to the mountain slope, flattened through a bulldozer and rolled through a vibration rolling machine layer by layer until the dry density of the phosphogypsum residues reaches above 96% of the maximum dry density of the phosphogypsum residues, the outer slope surface of a phosphogypsum slope is compacted and leveled, a seepage-proofing film, namely an HDPE film is laid on the outer slope surface, the HDPE film is shaped according to the slope shape, and finally another layer of clay is laid on the HDPE film of the outer surface of the slope. By the adoption of the method for phosphogypsum slope sticking, a reliable base layer is provided for the HDPE film, the lime milk layer is additionally laid, acid solutions generated when phosphogypsum reacts with water can be effectively neutralized, especially, free fluorinions formed when the phosphogypsum reacts with water are precipitated, and groundwater pollution and environmental pollution caused by permeation can be reduced.

Description

technical field [0001] The invention relates to the utilization field of phosphogypsum, in particular to a method for sticking a phosphogypsum slope to a slope. Background technique [0002] In the process of wet acid production, a large amount of by-product phosphogypsum will be produced, which is recycled and reused, and is often used to paste slopes to solve the problem of steep slopes. Phosphogypsum and water produce a highly polluting acidic aqueous solution, and HDPE membranes can prevent acidic water from penetrating and polluting the environment. Therefore, the traditional phosphogypsum slope is to construct a clay cushion and HDPE membrane around the slope. The puncture resistance and tensile strength of HDPE film are limited, so the laying of HDPE film has high requirements on the material of the underlying layer of the film. The material of the underlying layer of the film cannot contain large particles with a particle size of more than 7mm, otherwise the HDPE fil...

AI Technical Summary

Problems solved by technology

In the case of a steep slope, the laying of the clay cushion is very difficult or even impossible, and the friction between the HDPE film and the phosphogypsum is also relatively large. Stretching and deformation, eventually leading to tearing, acidic aqueous solution penetration, causing water pollution, and then polluting the environment