Method and device for bottom drainage and seepage of film-laying anti-seepage phosphogypsum yard

Abstract

The invention discloses a method and a device for bottom drainage and seepage of a film-laying anti-seepage phosphogypsum storage yard, wherein water contained in phosphogypsum under a phosphogypsum initial-stage dam with an HDPE (High-Density Polyethylene) film laid on the upstream slope surface is drained so that the phosphogypsum under the initial-stage dam is solidified; besides, a reinforced concrete box culvert is arranged in the dam heel position of the upstream surface of the initial-stage dam and a plastic blind ditch is filled in the reinforced concrete box culvert; and the water seepage is collected by the reinforced concrete box culvert, is filtered by the plastic blind ditch and enters a stainless steel pipe at the tail part of the reinforced concrete box culvert to be drained out of the reinforced concrete box culvert, and further is drained to the downstream through an HDPE pipe which buried through the bottom of the initial-stage dam. The drainage and seepage system provided by the invention guides out the water contained in phosphogypsum stacked in a reservoir basin under the elevation of the initial-stage dam of the storage yard and water accumulated from rainfall and then guides the water to the downstream from the bottom of the dam to a regulating reservoir outside the reservoir, so that the water contained in the phosphogypsum is drained as soon as possible, and drainage and solidification of the phosphogypsum are accelerated; and as a result, the stability of the phosphogypsum storage yard is ensured.

Description

technical field [0001] The invention relates to a method and a device for draining seepage at the bottom of a phosphogypsum stockyard with film-laying and anti-seepage, and belongs to the technical field of chemical facilities. Background technique [0002] Modern phosphorus resources are mainly used to produce phosphate fertilizers. The main method is to produce phosphoric acid through the reaction of sulfuric acid and apatite, and a large amount of by-product phosphogypsum will be produced in this process. According to the "General Industrial Solid Waste Storage and Disposal Pollution Control Standards" (GB18599-2001), the pH value of phosphogypsum is 1~2, which belongs to the second type of general industrial solid waste. According to the current environmental protection requirements, the phosphogypsum storage yard needs Laying anti-seepage film to prevent acid water from leaking out. After the phosphogypsum stockyard was laid with film to prevent seepage, the initial da...

AI Technical Summary

Problems solved by technology

The phosphogypsum below the initial dam has been soaked in water for a long time, and the accumulated phosphogypsum is in a saturated state. The phosphogypsum cannot be drained and consolidated, resulting in a greatly reduced mechanical property of the phosphogypsum, which is not conducive to the stability of the later accumulated phosphogypsum.

In response to this situation, there are currently no relevant academic papers or patents at home and abroad to solve this problem

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