Rain and sewage diversion system for phosphogypsum yard

Abstract

The invention relates to a rain and sewage diversion system for a phosphogypsum yard, a water guide pipe (30) for guiding water at the rear part of the yard and the water seeped from a hillside to a down stream of the yard is arranged in a hill body (20) below the bottom of the valley-shaped phosphogypsum yard (100), an intercepting drain (60) for isolating the steep hillside from the yard is dug on the steep hillside (21) at the height of a slag heap, which corresponds to the maximum bearing capacity of the water guide pipe, the intercepting drain is communicated with a water accumulation region at the rear part of the yard and a region outside the yard, even a pipeline at the bottom of a reservoir is sunk, water level at the tail part of the reservoir only rises to the height of the intercepting drain, and then the water flows out the region of the yard from the intercepting drain, thereby avoiding forming a dammed lake, preventing a slag field from being destroyed by flushing, protecting the safety of the masses at the down stream of the slag field, and also preventing surface water from back-filling into the yard. The height of phosphogypsum accumulated on an anti-seepage membrane is always higher than the water level at the tail of the reservoir, and the problem that the anti-seepage membrane is jacked up and raised by underground water can be avoided during the running process of the slag field. The system selects one side with steeper slope of the hillside to build the intercepting drain, and the loss of reservoir capacity is minimal.

Description

technical field [0001] The invention relates to a rain and sewage diversion system of a phosphogypsum storage yard. Background technique [0002] Phosphogypsum is a by-product of phosphoric acid production. For every ton of P produced 2 o 5 , will produce 4.5 to 5.5 tons of by-product phosphogypsum. Phosphogypsum is mainly composed of calcium sulfate dihydrate (CaSO 4 2H 2 O) composition, and contains a small amount of silicide and unreacted phosphate rock. The total amount of phosphogypsum discharged in China exceeds 50 million tons every year. [0003] The pore water of phosphogypsum contains highly polluting acidic pore water. Therefore, the storage site of phosphogypsum generally needs to lay high-density polyethylene film (HDPE film) to prevent the acidic water from seeping and polluting the environment. The anti-seepage phosphogypsum storage yard built in the valley needs to minimize the surface water from the upstream of the slag yard and the seepage water from...

AI Technical Summary

Problems solved by technology

Even if the pipeline does not collapse during the operation of the slag yard, in the years or decades after the slag yard is closed, the pipeline may be blocked due to aging or sedimentation, thus forming a barrier lake at the end of the silo and eventually washing out The slag yard poses a great threat to the safety of the downstream people

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